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Sample records for 238u-230th-226ra discussions sur

  1. 238U-230Th-226Ra disequilibria in dacite and plagioclase from the 2004-2005 eruption of Mount St. Helens: Chapter 36 in A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006

    USGS Publications Warehouse

    Cooper, Kari M.; Donnelly, Carrie T.; Sherrod, David R.; Scott, William E.; Stauffer, Peter H.

    2008-01-01

    230Th)/(232Th) measured for the 1980s reference suite. However, (230Th)/(232Th) for plagioclase separates for dome samples erupted during October and November 2004 are significantly different from corresponding whole-rock values, which suggests that a large fraction (>30 percent) of crystals in each sample are foreign to the host liquid. Furthermore, plagioclase in the two 2004 samples have U-series characteristics distinct from each other and from plagioclase in dacite erupted in 1982, indicating that (1) the current eruption must include a component of crystals (and potentially associated magma) that were not sampled by the 1980-86 eruption, and (2) dacite magmas erupted only a month apart in 2004 contain different populations of crystals, indicating that this foreign component is highly heterogeneous within the 2004-5 magma reservoir.

  2. Recent volcanic accretion at 9°N-10°N East Pacific Rise as resolved by combined geochemical and geological observations

    NASA Astrophysics Data System (ADS)

    Waters, C. L.; Sims, K. W. W.; Soule, S. A.; Blichert-Toft, J.; Dunbar, N. W.; Plank, T.; Prytulak, J.; Sohn, R. A.; Tivey, M. A.

    2013-08-01

    The ridge crest at 9°N-10°N East Pacific Rise (EPR) is dominated by overlapping lava flows that have overflowed the axial summit trough and flowed off-axis, forming a shingle-patterned terrain up to ˜2-4 km on either side of the axial summit trough. In this study, we employ 230Th-226Ra dating methods, in conjunction with geochemistry and seafloor geological observations, in an effort to discern the stratigraphic relationships between adjacent flows. We measured major and trace elements and 87Sr/86Sr, 143Nd/144Nd, 176Hf/177Hf, and 238U-230Th-226Ra for lava glass samples collected from several flow units up to ˜2 km away from the axial summit trough on the ridge crest at 9°50'N EPR. Statistical analysis of the 238U-230Th-226Ra data indicates that all but one measured sample from these flows cannot be resolved from the zero-age population; thus, we cannot confidently assign model ages to samples for discerning stratigraphic relationships among flows. However, because groups of samples can be distinguished based on similarities in geochemical compositions, particularly incompatible element abundances with high precision-normalized variability such as U and Th, and because the range of compositions is much greater than that represented by samples from the 1991-1992 and 2005-2006 eruptions, we suggest that the dive samples represent 6-10 eruptive units despite indistinguishable model ages. Geochemical variability between individual flows with similar ages requires relatively rapid changes in parental melt composition over the past ˜2 ka, and this likely reflects variations in the relative mixing proportions of depleted and enriched melts derived from a heterogeneous mantle source.

  3. DISCUSSION

    EPA Science Inventory

    This is an invited discussion of three invited papers on statistical disclosure limitation from the Second International Conference on Establishment Surveys, Buffalo, NY, June 2000. The three papers in this session deal with computing, estimates, and computing estimates in the c...

  4. (210)Pb-(226)Ra disequilibria in young gas-laden magmas.

    PubMed

    Reagan, Mark; Turner, Simon; Handley, Heather; Turner, Michael; Beier, Christoph; Caulfield, John; Peate, David

    2017-03-24

    We present new (238)U-(230)Th-(226)Ra-(210)Pb and supporting data for young lavas from southwest Pacific island arcs, Eyjafjallajökull, Iceland, and Terceira, Azores. The arc lavas have significant (238)U and (226)Ra excesses, whereas those from the ocean islands have moderate (230)Th and (226)Ra excesses, reflecting mantle melting in the presence of a water-rich fluid in the former and mantle melting by decompression in the latter. Differentiation to erupted compositions in both settings appears to have taken no longer than a few millennia. Variations in the ((210)Pb/(226)Ra)0 values in all settings largely result from degassing processes rather than mineral-melt partitioning. Like most other ocean island basalts, the Terceira basalt has a (210)Pb deficit, which we attribute to ~8.5 years of steady (222)Rn loss to a CO2-rich volatile phase while it traversed the crust. Lavas erupted from water-laden magma systems, including those investigated here, commonly have near equilibrium ((210)Pb/(226)Ra)0 values. Maintaining these equilibrium values requires minimal persistent loss or accumulation of (222)Rn in a gas phase. We infer that degassing during decompression of water-saturated magmas either causes these magmas to crystallize and stall in reservoirs where they reside under conditions of near stasis, or to quickly rise towards the surface and erupt.

  5. 210Pb-226Ra disequilibria in young gas-laden magmas

    NASA Astrophysics Data System (ADS)

    Reagan, Mark; Turner, Simon; Handley, Heather; Turner, Michael; Beier, Christoph; Caulfield, John; Peate, David

    2017-03-01

    We present new 238U-230Th-226Ra-210Pb and supporting data for young lavas from southwest Pacific island arcs, Eyjafjallajökull, Iceland, and Terceira, Azores. The arc lavas have significant 238U and 226Ra excesses, whereas those from the ocean islands have moderate 230Th and 226Ra excesses, reflecting mantle melting in the presence of a water-rich fluid in the former and mantle melting by decompression in the latter. Differentiation to erupted compositions in both settings appears to have taken no longer than a few millennia. Variations in the (210Pb/226Ra)0 values in all settings largely result from degassing processes rather than mineral-melt partitioning. Like most other ocean island basalts, the Terceira basalt has a 210Pb deficit, which we attribute to ~8.5 years of steady 222Rn loss to a CO2-rich volatile phase while it traversed the crust. Lavas erupted from water-laden magma systems, including those investigated here, commonly have near equilibrium (210Pb/226Ra)0 values. Maintaining these equilibrium values requires minimal persistent loss or accumulation of 222Rn in a gas phase. We infer that degassing during decompression of water-saturated magmas either causes these magmas to crystallize and stall in reservoirs where they reside under conditions of near stasis, or to quickly rise towards the surface and erupt.

  6. [Radiation risk assessment for plant reference species (Pinus sylvestris and Vicia cracca) from the area of radium production waste storage].

    PubMed

    Evseeva, T I; Geras'kin, S A; Belykh, E S; Maĭstrenko, T A; Vakhrusheva, O M

    2012-01-01

    The risk of an enhanced level of radionuclides of the uranium and thorium decay series in the environment for reference plant species (Pinus sylvestris and Vicia cracca) was assessed. 238U, 230Th, 226Ra, 210Po, 232Th and 228Th concentration factors for plants were found to be lower than one. The aboveground parts of Vicia cracca sampled from the area of the radium production waste storage mainly accumulated 22Ra, Pinus sylvestris branches--210Pb, 226Ra and 210Po. LOEDR calculated for the chromosome aberration frequency in both plant studies was 17-71 microGy/h. LOERD values for the reproductive capacity decrease in P. sylvestris and V. cracca were 17-71 microGy/h and 116-258 microGy/h, correspondingly. EDR10 for the chromosome aberration frequency in P. sylvestris and V. cracca were 148 and 347 microGy/h, that is, correspondingly, 255 and 708 times higher that background values. EDR10 for the plant reproductive capacity was 11-34 microGy/h, which 19-69 times increases the background values.

  7. Localised magmatic constraints on continental back-arc volcanism in southern Mendoza, Argentina: the Santa Maria Volcano

    NASA Astrophysics Data System (ADS)

    Espanon, Venera R.; Chivas, Allan R.; Turner, Simon P.; Kinsley, Leslie P. J.; Dosseto, Anthony

    2016-11-01

    The Payún Matrú Volcanic Field constitutes part of the continental back-arc in Argentina. This volcanic field has been the focus of several regional investigations; however, geochemical analysis of recent volcanoes (<8 ka) at the scale of an individual volcano has not been conducted. We present a morphological description for the Santa Maria Volcano in addition to results from major and trace element analysis and 238U-230Th-226Ra disequilibria. The trace element evidence suggests that the Santa Maria magmatic source has a composition similar to that of the local intraplate end member (resembling an ocean island basalt-like source), with a slight contribution from subduction-related material. The U-series analyses suggest a high 226Ra excess over 230Th for this volcano, which is not derived from a shallow process such as hydrothermal alteration or upper crustal contamination. Furthermore, intermediate-depth processes such as fractional crystallisation have been inferred for the Santa Maria Volcano, but they are not capable of producing the 226Ra excess measured. The 226Ra excess is explained by deep processes like partial melting of mantle lithologies with some influence from subducted Chilean trench sediments. Due to the short half-life of 226Ra (1600 years), we infer that fast magma ascent rates are required to preserve the high 226Ra excess.

  8. Evolution of vegetation and soil nutrients after uranium mining in Los Ratones mine (Cáceres, Spain).

    PubMed

    Pérez-Fernández, María A; Vera-Tomé, Feliciano; Blanco-Rodríguez, María P; Lozano, Juan C

    2014-06-01

    The evolution of vegetation structure following mine rehabilitation is rather scarce in the literature. The concentration of long-lived radionuclides of the (238)U series might have harmful effects on living organisms. We studied soil properties and the natural vegetation occurring along a gradient in Los Ratones, an area rehabilitated after uranium mining located in Cáceres, Spain. Soil and vegetation were sampled seasonally and physical and chemical properties of soil were analysed, including natural isotopes of (238)U, (230)Th, (226)Ra and (210)Pb. Species richness, diversity, evenness and plant cover were estimated and correlated in relation to soil physical and chemical variables. The location of the sampling sites along a gradient had a strong explanatory effect on the herbaceous species, as well as the presence of shrubs and trees. Seasonal effects of the four natural isotopes were observed in species richness, species diversity and plant cover; these effects were directly related to the pH values in the soil, this being the soil property that most influences the plant distribution. Vegetation in the studied area resembles that of the surroundings, thus proving that the rehabilitation carried out in Los Ratones mine was successful in terms of understorey cover recovery.

  9. 210Pb-226Ra disequilibria in young gas-laden magmas

    PubMed Central

    Reagan, Mark; Turner, Simon; Handley, Heather; Turner, Michael; Beier, Christoph; Caulfield, John; Peate, David

    2017-01-01

    We present new 238U-230Th-226Ra-210Pb and supporting data for young lavas from southwest Pacific island arcs, Eyjafjallajökull, Iceland, and Terceira, Azores. The arc lavas have significant 238U and 226Ra excesses, whereas those from the ocean islands have moderate 230Th and 226Ra excesses, reflecting mantle melting in the presence of a water-rich fluid in the former and mantle melting by decompression in the latter. Differentiation to erupted compositions in both settings appears to have taken no longer than a few millennia. Variations in the (210Pb/226Ra)0 values in all settings largely result from degassing processes rather than mineral-melt partitioning. Like most other ocean island basalts, the Terceira basalt has a 210Pb deficit, which we attribute to ~8.5 years of steady 222Rn loss to a CO2-rich volatile phase while it traversed the crust. Lavas erupted from water-laden magma systems, including those investigated here, commonly have near equilibrium (210Pb/226Ra)0 values. Maintaining these equilibrium values requires minimal persistent loss or accumulation of 222Rn in a gas phase. We infer that degassing during decompression of water-saturated magmas either causes these magmas to crystallize and stall in reservoirs where they reside under conditions of near stasis, or to quickly rise towards the surface and erupt. PMID:28338093

  10. Sill to surface: Linking young off-axis volcanism with subsurface melt at the overlapping spreading center at 9°03‧N East Pacific Rise

    NASA Astrophysics Data System (ADS)

    Waters, Christopher L.; Sims, Kenneth W. W.; Klein, Emily M.; White, Scott M.; Reagan, Mark K.; Girard, Guillaume

    2013-05-01

    No young, off-axis, mid-ocean ridge lavas have yet been directly linked to underlying off-axis melt bodies. In this study, we present new measurements of 238U-230Th-226Ra-210Pb isotope compositions for a suite of lavas from the overlapping spreading center (OSC) at 9°03'N on the East Pacific Rise (EPR). These lavas span a large range of compositions, from basalt to dacite, and include both axial and off-axis samples recovered from a prominent, axis-parallel pillow ridge and a flat-topped seamount that overlie the westernmost extent of a 4-km-wide melt lens (Kent et al., 2000). We report 210Pb excesses in axial basalts and basaltic andesites, which we suggest results from gas-magma fractionation of 222Rn from 226Ra beneath dacite magmas. In addition, our U-series ages agree with visual observations, indicating that while most recent volcanic activity occurs at the spreading axis, active volcanism also occurs away from the axis. Specifically, the off-axis pillow ridge and seamount samples overlying the off-axis subsurface melt body have eruption ages of less than 8 ka, and likely as young as 1 ka, despite being located on crust that has a spreading age of ~75 ka. The young ages of these lavas, combined with existing geological, geochemical and geophysical constraints, provide evidence for a genetic link between the pillow ridge and seamount lavas and the seismically imaged, underlying off-axis melt lens. This link demonstrates that off-axis volcanism does not necessarily come from a sub-axial magma body and can be sourced directly from off-axis magma bodies.

  11. Geochemical hosts of solubilized radionuclides in uranium mill tailings

    USGS Publications Warehouse

    Landa, E.R.; Bush, C.A.

    1990-01-01

    The solubilization and subsequent resorption of radionuclides by ore components or by reaction products during the milling of uranium ores may have both economic and environmental consequences. Particle-size redistribution of radium during milling has been demonstrated by previous investigators; however, the identification of sorbing components in the tailings has received little experimental attention. In this study, uranium-bearing sandstone ore was milled, on a laboratory scale, with sulfuric acid. At regular intervals, filtrate from this suspension was placed in contact with mixtures of quartz sand and various potential sorbents which occur as gangue in uranium ores; the potential sorbents included clay minerals, iron and aluminum oxides, feldspar, fluorspar, barite, jarosite, coal, and volcanic glass. After equilibration, the quartz sand-sorbent mixtures were separated from the filtrate and radioassayed by gamma-spectrometry to determine the quantities of 238U, 230Th, 226Ra, and 210Pb sorbed, and the radon emanation coefficients. Sorption of 238U was low in all cases, with maximal sorptions of 1-2% by the bentonite- and coal-bearing samples. 230Th sorption also was generally less than 1%; maximal sorption here was observed in the fluorspar-bearing sample and appears to be associated with the formation of gypsum during milling. 226Ra and 210 Pb generally showed higher sorption than the other nuclides - more than 60% of the 26Ra solubilized from the ore was sorbed on the barite-bearing sample. The mechanism (s) for this sorption by a wide variety of substrates is not yet understood. Radon emanation coefficients of the samples ranged from about 5 to 30%, with the coal-bearing samples clearly demonstrating an emanating power higher than any of the other materials. ?? 1990.

  12. U-series isotope systematics of mafic magmas from central Oregon: Implications for fluid involvement and melting processes in the Cascade arc

    NASA Astrophysics Data System (ADS)

    Mitchell, Euan C.; Asmerom, Yemane

    2011-12-01

    The Cascade arc is the warm-slab subduction zone global end member, where a broad variety of primitive magmas with highly variable slab fluid signatures have erupted in close spatial and temporal proximity. A number of petrogenetic models have been proposed to explain the occurrence of such diverse magmas, but the source(s) of these magmas and the timing of fluid addition to the sub-arc mantle remain controversial. We present uranium-series isotope data ( 238U- 230Th- 226Ra) for eighteen mafic lavas from the Three Sisters region of the central Oregon Cascades, and for a further six lavas from the rear-arc Newberry Volcano. The majority of these samples have geochemical characteristics (e.g. Nb/Zr, Ba/Zr, 87Sr/ 86Sr) consistent with previously described calc-alkaline basalts from this region of the arc, and indicative of limited fluid involvement at some stage in their genesis. Trace element and long-lived radiogenic isotope modeling suggests that this fluid was derived from dehydration of subducting sediments, and was added to an enriched, garnet-bearing mantle wedge source. The trace element systematics of the lavas are consistent with small degree (< 10%) melts of this fluid-modified source. All samples display ( 230Th/ 238U) and ( 226Ra/ 230Th) ≥ 1, similar to values measured in fresh MORB and other parts of the arc. Results of a dynamic melting model support the interpretation that these lavas are small degree melts of an asthenospheric source, and do not allow for a lithospheric mantle source. However, the U-series data do not permit us to determine whether fluid addition was the trigger for melting, or whether the lavas were generated from a secular equilibrium source that had experienced fluid addition > 350 ka prior to melting. Regardless, modern fluid input is limited and melting is dominantly occurring in response to upwelling and decompression.

  13. Rapid time scales of basalt to andesite differentiation at Anatahan volcano, Mariana Islands

    NASA Astrophysics Data System (ADS)

    Reagan, Mark; Tepley, Frank J.; Gill, James B.; Wortel, Matthew; Hartman, Brian

    2005-08-01

    We present comprehensive U-series data ( 238U- 234U- 230Th- 226Ra- 210Pb- 210Po and ( 230Th)/( 232Th)) for an andesite from an oceanic arc. The juvenile Anatahan andesite has U-Th systematics colinear with other historical Mariana volcanic rocks, and is most similar to those of the other volcano in the Mariana arc with a significant proportion of silicic andesite: Uracas. Like Uracas, the parental basalt for the Anatahan andesite was generated by relatively low degrees of flux melting from a source previously enriched in a sediment component from the subducting slab. However, the Anatahan andesite is much more strongly enriched in 226Ra over 230Th than Uracas lavas, and has one of the highest ( 226Ra)/( 232Th) ratios of siliceous andesites globally. The long-lived disequilibria between 238U- 230Th- 226Ra in the Anatahan andesite are inherited from basalt genesis, not created during differentiation or eruption. Thus, the time between genesis of the parental basalt and eruption of andesite at Anatahan is shorter than for Uracas. Moreover, the near-equilibrium ( 210Pb)/( 226Ra) value indicates that the magma body did not persistently lose or gain 222Rn for more than 2 years before eruption. This permits differentiation of the parental basalt to form andesite within this 2-year time period, although a differentiation time period between 100 and a few thousand years also is possible. The relative activities between 210Po and 210Pb suggest erupted scoria degassed Po less than most lavas despite eruption plume heights of ˜10 km, which further suggests an unusually rapid ascent before eruption. These data also show that juvenile material was ejected from the first day of the eruption. Phreatomagmatic ejecta overlying the main Anatahan scoria is strongly enriched in 210Po over 210Pb, indicating that a significant proportion of the Po degassed from rising magmas sublimes in its shallow fumarolic conduit system.

  14. Timescales of storage and recycling of crystal mush at Krafla Volcano, Iceland

    NASA Astrophysics Data System (ADS)

    Cooper, Kari M.; Sims, Kenneth W. W.; Eiler, John M.; Banerjee, Neil

    2016-06-01

    Processes in upper-crustal magma reservoirs such as recharge, magma mixing, recycling of previously crystallized material, and eruption affect both the physical state and the chemical composition of magmas. A growing body of evidence shows that crystals in intermediate or silicic volcanic rocks preserve records of these processes that may be obscured due to mixing in the liquid fraction of magmas. Fewer studies have focused on crystals in basaltic lavas, but these show evidence for a more subtle, but still rich record of magmatic processes. We present new 238U-230Th-226Ra data for plagioclase, combined with δ18O and trace-element measurements of the same crystal populations, from basalts erupted at Krafla Volcanic Center, Iceland. These data document the presence of multiple crystal populations within each sample, with chemical and oxygen isotope heterogeneity at a variety of scales: within individual crystals, between crystals in a given population, between crystal populations within the same sample, and between crystals in lavas erupted from different vents during the same eruption. Comparison to whole-rock or groundmass data shows that the majority of macroscopic crystals are not in trace-element or oxygen isotope equilibrium with their host liquids. The most likely explanation for these data is that the macroscopic crystals originated within a highly heterogeneous crystal mush in the shallow magma reservoir system. U-series and diffusion data indicate that the crystals (and therefore the mush) formed recently (likely within a few thousand years of eruption, and with a maximum age of 8-9 ka), and that the crystals resided in their host magma prior to eruption for decades to a few centuries at most. These data, in conjunction with other recent studies, suggest a model where erupted Icelandic magmas are the result of diverse magmas entering the crust, followed by complex interactions between melts and previously crystallized material at all crustal levels.

  15. Isotopic constraints on the genesis and evolution of basanitic lavas at Haleakala, Island of Maui, Hawaii

    NASA Astrophysics Data System (ADS)

    Phillips, Erin H.; Sims, Kenneth W. W.; Sherrod, David R.; Salters, Vincent J. M.; Blusztajn, Jurek; Dulai, Henrietta

    2016-12-01

    To understand the dynamics of solid mantle upwelling and melting in the Hawaiian plume, we present new major and trace element data, Nd, Sr, Hf, and Pb isotopic compositions, and 238U-230Th-226Ra and 235U-231Pa-227Ac activities for 13 Haleakala Crater nepheline normative basanites with ages ranging from ∼900 to 4100 yr B.P. These basanites of the Hana Volcanics exhibit an enrichment in incompatible trace elements and a more depleted isotopic signature than similarly aged Hawaiian shield lavas from Kilauea and Mauna Loa. Here we posit that as the Pacific lithosphere beneath the active shield volcanoes moves away from the center of the Hawaiian plume, increased incorporation of an intrinsic depleted component with relatively low 206Pb/204Pb produces the source of the basanites of the Hana Volcanics. Haleakala Crater basanites have average (230Th/238U) of 1.23 (n = 13), average age-corrected (226Ra/230Th) of 1.25 (n = 13), and average (231Pa/235U) of 1.67 (n = 4), significantly higher than Kilauea and Mauna Loa tholeiites. U-series modeling shows that solid mantle upwelling velocity for Haleakala Crater basanites ranges from ∼0.7 to 1.0 cm/yr, compared to ∼10 to 20 cm/yr for tholeiites and ∼1 to 2 cm/yr for alkali basalts. These modeling results indicate that solid mantle upwelling rates and porosity of the melting zone are lower for Hana Volcanics basanites than for shield-stage tholeiites from Kilauea and Mauna Loa and alkali basalts from Hualalai. The melting rate, which is directly proportional to both the solid mantle upwelling rate and the degree of melting, is therefore greatest in the center of the Hawaiian plume and lower on its periphery. Our results indicate that solid mantle upwelling velocity is at least 10 times higher at the center of the plume than at its periphery under Haleakala.

  16. Utilisation de traceurs radioactifs pour l'évaluation du recrutement des leucocytes et des échanges vasculaires au niveau d'organes in~vivo. Description d'une méthode et discussion des problèmes d'interprétation sur quelques exemples

    NASA Astrophysics Data System (ADS)

    Bureau, M. F.

    1997-03-01

    An experimental method using simultaneously different γ emiter tracers was developed to evaluate inflammation in vivo. Experiments were performed on the anaesthetized guinea-pig to test pulmonary effects of inflammatory agents. Red blood cells, albumin and inflammatory cells (platelets or leucocytes) radiolabelled with 99m technetium, 131 iodine and 111 indium respectively were injected i.v. Their radioactivities were measured on a pulmonary region by external detection and on blood samples in a well type counter. From these measurements variations of the lung contents in red blood cells, extravascular albumin and non circulating leucocytes during inflammatory stimulation were evaluated. These parameters axe indexes of blood perfusion, vascular exchanges and leucocyte sequestration respectively. Fiability of the method and meaning of the parameters evaluated are discussed. Une méthode expérimentale utilisant simultanément différents traceurs γ a été développée pour évaluer l'inflammation in vivo. Des expériences ont été réalisées chez le cobaye anesthésié pour tester l'effet pulmonaire d'agents inflammatoires. Des globules rouges, de l'albumine et des cellules inflammatoires (plaquettes ou leucocytes) radiomarqués respectivement au technetium 99m, à l'iode 131 et à l'indium 111 sont injectés i.v. Leurs radioactivités sont mesurées sur une région pulmonaire par détection externe et sur des échantillons sanguins au compteur puit. À partir de ces mesures sont évaluées les variations des contenus pulmonaires en globules rouges, en albumine extravasculaire et en leucocytes non circulants lors d'une stimulation inflammatoire. Ces paramètres sont corrélés aux modifications de la perfusion, des échanges vasculaires et de la séquestration leucocytaire. La fiabilité de la méthode et la signification des paramètres évalués sont discutées.

  17. Antimicrobial screening of medicinal plants from Baja California Sur, Mexico.

    PubMed

    Encarnación Dimayuga, R; Keer Garcia, S

    1991-02-01

    The ethanolic extracts of 72 plants belonging to 35 different families, and used in traditional medicine in Baja California Sur (México), were tested for antimicrobial activity in vitro using the filter paper disk assay method. Activity against Staphylococcus aureus, Bacillus subtilis, Streptococcus faecalis (Gram-positive microorganisms), Escherichia coli (Gram-negative microorganisms) and Candida albicans (yeast) is discussed.

  18. Traditional medicine of Baja California Sur (Mexico). I.

    PubMed

    Dimayuga, R E; Agundez, J

    1986-08-01

    This study deals with the medicinal use of 30 plants collected in the Municipio de Los Cabos and part of the Municipio de la Paz, Baja California Sur, Mexico. The plants were all taxonomically identified at least to genus level, and their medicinal use, as described to us by elder people, is discussed.

  19. Les torsions sur testicules cryptorchides

    PubMed Central

    Gharbi, Mohamed; Amri, Najmeddine; Chambeh, Wahib; Braiek, Salem; Kamel, Rafik El

    2010-01-01

    Résumé But : La cryptorchidie est une pathologie assez fréquente en urologie. Elle est associée à un risque élevé d’infertilité et de dégénérescence. Elle semble aussi être associée à un risque important de torsion. Cette entité est très peu abordée dans la littérature. Nous rapportons tous les cas de torsion sur testicule cryptorchide observés à notre service dans le but de mieux caractériser cette pathologie et de réduire ainsi le taux d’orchidectomies. Méthodologie : Il s’agit d’une étude rétrospective portant sur tous les cas de torsion sur testicule cryptorchide opérés dans notre service d’urologie entre 1999 et 2007. Les patients ont fait l’objet d’une description basée sur le résumé de leurs observations. Résultats : Les patients étaient âgés de 7 mois à 39 ans. La torsion touchait le testicule droit dans 53 % des cas. Le tableau clinique comportait une douleur au niveau de la région inguinale d’apparition soudaine avec une masse sous-cutanée inflammatoire et douloureuse à ce niveau et surtout un hémiscrotum homolatéral vide. Dans 60 % des cas, le diagnostic était tardif et une orchidectomie a été réalisée. Dans les autre cas, un abaissement du testicule a été réalisé avec orchidopexie controlatéral dans le même temps opératoire. Conclusion : Bien qu’il s’agisse d’une pathologie peu courante, la torsion sur testicule cryptorchide doit être étudiée davantage. Le diagnostic précoce permettra de sauver et d’abaisser le testicule et faciliter ainsi le dépistage d’une éventuelle dégénérescence. PMID:21191497

  20. Traditional medicine of Baja California Sur (Mexico). II.

    PubMed

    Encarnacion Dimayuga, R; Fort Murillo, R; Luis Pantoja, M

    1987-08-01

    Continuing our studies of traditional medicine, as used in rural areas of Baja California Sur, now we wish to report on the medicinal uses of 49 more plants. Some of the more complex recipes of these medicinal plants, are discussed in the present paper. The information presented here was collected in the Municipio of Los Cabos and part of the Municipio of La Paz, B.C.S., Mexico.

  1. A Discussion.

    ERIC Educational Resources Information Center

    Interchange on Education, 1984

    1984-01-01

    A panel discusses the importance of mission-oriented research in a university relative to that of curiosity-based research. Discussants include Wes Cragg, John Leyerle, Gordon Slemon, David Olson, Jack Stevenson, and Bob Czerny. (CJB)

  2. Strengthening Discussions

    ERIC Educational Resources Information Center

    Hintz, Allison B.

    2013-01-01

    "Strategy sharing" is a certain type of discussion that centers on students' ideas and occurs when children present different approaches to problems and provide information about how they solved the problem (Wood, Williams, and McNeal 2004). A teacher may orchestrate a strategy-sharing discussion to achieve one or more of the…

  3. Reframing Discussions

    ERIC Educational Resources Information Center

    Sherry, Michael B.

    2010-01-01

    Recitations and discussions are two types of interactions which have long been of interest to researchers who study classroom discourse in secondary English and Social Studies. According to research, teachers control the discourse during recitations through "inauthentic" questions requiring pre-specified answers. In contrast, discussions involve…

  4. Le Point sur... Astronomie IV

    NASA Astrophysics Data System (ADS)

    Pecker, J.-C.

    Cet ouvrage regroupe des articles de mise au point sollicités par le rédacteur en chef de la rubrique Astronomie des Comptes rendus de l'Académie des sciences. Les textes se proposent de faire découvrir aux lecteurs, dans les principales disciplines de l'astronomie, les résultats les plus remarquables des dernières années.Leurs auteurs sont des spécialistes participant activement à l'accroissement des connaissances dans des domaines faisant l'objet de recherches intensives. Ces mises au point sur des questions particulièrement importantes de l'astronomie sont rédigées soit en français, soit en anglais et accompagnées d'une bibliographie détaillée.

  5. Risky Discussions

    ERIC Educational Resources Information Center

    Cook, Julian; Jacobs, Neil

    2006-01-01

    This article considers a hypothetical decision by a hypothetical learner about whether or not to participate in an online "discussion", viewed through the lens of risk analysis. It begins with the premise that participation online is desirable but that it involves the participant in risk, a fact that needs to be acknowledged and taken into account…

  6. 231Pa systematics in postglacial volcanic rocks from Iceland

    NASA Astrophysics Data System (ADS)

    Turner, Simon; Kokfelt, Thomas; Hoernle, Kaj; Lundstrom, Craig; Hauff, Folkmar

    2016-07-01

    Several recent studies have highlighted the potential of combined 238U-230Th and 235U-231Pa systematics to constrain upwelling rates and the role of recycled mafic lithologies in mantle plume-derived basalts. Accordingly, we present measurements of the 231Pa concentrations from 26 mafic volcanic rocks from Iceland, including off-axis basalts from the Snaefellsnes Peninsula, to complement previously published 238U-230Th-226Ra data. 231Pa concentrations vary from 27 to 624 fg/g and (231Pa/235U) ratios from 1.12 to 2.11 with the exception of one anomalous sample from the Southeast Rift which has a 231Pa deficit with (231Pa/235U) = 0.86. An important new result is that basalts from the Southeast Rift and the Snaefellsnes Peninsula define a trend at relatively low (231Pa/235U) for a given (230Th/238U) ratio. Many of the remaining samples fall in or around the global field for ocean island basalts but those from the Mid-Iceland Belt and the Southwest Rift/Reykjanes Peninsula extend to higher (231Pa/235U) ratios at a given (230Th/238U), similar to mid-ocean ridge basalts. In principle, these lavas could result from melting of peridotite at lower pressures. However, there is no reason to suspect that the Mid-Iceland Belt and the Southwest Rift lavas reflect shallower melting than elsewhere in Iceland. In our preferred model, these lavas reflect melting of garnet peridotite whereas those from the Southeast Rift and the Snaefellsnes Peninsula contain a significant contribution (up to 20%) of melt from garnet pyroxenite. This is consistent with incompatible trace element and radiogenic isotope evidence for recycled oceanic crust in these lavas. There is increasing agreement that the displacement of ocean island basalts to lower (231Pa/235U) ratios at a given (230Th/238U), compared to mid-ocean ridge basalts, reflects the role of recycled mafic lithologies such as garnet pyroxenite as well as higher average pressures of melting. It now seems likely that this interpretation may

  7. Pockmarks off Big Sur, California

    USGS Publications Warehouse

    Paull, C.; Ussler, W.; Maher, N.; Greene, H. Gary; Rehder, G.; Lorenson, T.; Lee, H.

    2002-01-01

    A pockmark field was discovered during EM-300 multi-beam bathymetric surveys on the lower continental slope off the Big Sur coast of California. The field contains ??? 1500 pockmarks which are between 130 and 260 m in diameter, and typically are 8-12 m deep located within a 560 km2 area. To investigate the origin of these features, piston cores were collected from both the interior and the flanks of the pockmarks, and remotely operated vehicle observation (ROV) video and sampling transects were conducted which passed through 19 of the pockmarks. The water column within and above the pockmarks was sampled for methane concentration. Piston cores and ROV collected push cores show that the pockmark field is composed of monotonous fine silts and clays and the cores within the pockmarks are indistinguishable from those outside the pockmarks. No evidence for either sediment winnowing or diagenetic alteration suggestive of fluid venting was obtained. 14C measurements of the organic carbon in the sediments indicate continuous sedimentation throughout the time resolution of the radiocarbon technique ( ??? 45000 yr BP), with a sedimentation rate of ??? 10 cm per 1000 yr both within and between the pockmarks. Concentrations of methane, dissolved inorganic carbon, sulfate, chloride, and ammonium in pore water extracted from within the cores are generally similar in composition to seawater and show little change with depth, suggesting low biogeochemical activity. These pore water chemical gradients indicate that neither significant accumulations of gas are likely to exist in the shallow subsurface ( ??? 100 m) nor is active fluid advection occurring within the sampled sediments. Taken together the data indicate that these pockmarks are more than 45000 yr old, are presently inactive, and contain no indications of earlier fluid or gas venting events. ?? 2002 Elsevier Science B.V. All rights reserved.

  8. Office of Naval Research (ONR) Support for R/V Point Sur Ship Operations

    DTIC Science & Technology

    2016-01-07

    WORK UNIT NUMBER N/A 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) San Jose State university Research Foundation 210 N. Fourth St...Discussion of Work : The ONR Ship Operations Award, N00014-15-1-2123, provided support for the Research Vessel Point Sur from January 1, 2014 through June

  9. AirMSPI PODEX BigSur Terrain Images

    Atmospheric Science Data Center

    2013-12-13

    ... Browse Images from the PODEX 2013 Campaign   Big Sur target (Big Sur, California) 02/03/2013 Terrain-projected   Select ...   Version number   For more information, see the Data Product Specifications (DPS)   ...

  10. ABCC9/SUR2 in the brain: implications for hippocampal sclerosis of aging and a potential therapeutic target

    PubMed Central

    Nelson, Peter T.; Jicha, Gregory A.; Wang, Wang-Xia; Ighodaro, Eseosa; Artiushin, Sergey; Nichols, Colin G.; Fardo, David W.

    2015-01-01

    The ABCC9 gene and its polypeptide product, SUR2, are increasingly implicated in human neurologic disease, including prevalent diseases of the aged brain. SUR2 proteins are a component of the ATP-sensitive potassium (“KATP”) channel, a metabolic sensor for stress and/or hypoxia that has been shown to change in aging. The KATP channel also helps regulate the neurovascular unit. Most brain cell types express SUR2, including neurons, astrocytes, oligodendrocytes, microglia, vascular smooth muscle, pericytes, and endothelial cells. Thus it is not surprising that ABCC9 gene variants are associated with risk for human brain diseases. For example, Cantu syndrome is a result of ABCC9 mutations; we discuss neurologic manifestations of this genetic syndrome. More common brain disorders linked to ABCC9 gene variants include hippocampal sclerosis of aging (HS-Aging), sleep disorders, and depression. HS-Aging is a prevalent neurological disease with pathologic features of both neurodegenerative (aberrant TDP-43) and cerebrovascular (arteriolosclerosis) disease. As to potential therapeutic intervention, the human pharmacopeia features both SUR2 agonists and antagonists, so ABCC9/SUR2 may provide a “druggable target”, relevant perhaps to both HS-Aging and Alzheimer’s disease. We conclude that more work is required to better understand the roles of ABCC9/SUR2 in the human brain during health and disease conditions. PMID:26226329

  11. Let's Discuss: Teaching Students about Discussions

    ERIC Educational Resources Information Center

    Brank, Eve; Wylie, Lindsey

    2013-01-01

    Research consistently demonstrates the benefits of employing classroom discussions; however, there has been less attention given to teaching students about discussions. The current research compared 2 advanced social psychology courses: 1 without (control) and 1 with (experimental) a week devoted to learning about and discussing discussions.…

  12. Sur8 mediates tumorigenesis and metastasis in colorectal cancer

    PubMed Central

    Lee, Young-Mi; Kaduwal, Saluja; Lee, Kug Hwa; Park, Jong-Chan; Jeong, Woo-Jeong; Choi, Kang-Yell

    2016-01-01

    Sur8, a scaffold protein of the Ras pathway, interacts with Ras and Raf and modulates the Ras-extracellular signal-regulated kinase (ERK) pathway. Here we show that Sur8 is overexpressed in established human colorectal cancer (CRC) cell lines and CRC patient tissues. Moreover, Sur8 expression is increased during liver metastasis in CRC patients. Sur8 knockdown decreases ERK and Akt activities in CRC cell lines, regardless of their K-Ras, B-Raf or PI3K mutation status. Overexpression or knockdown of Sur8 increases or decreases, respectively, the proliferation or transformation of CRC cell lines. Sur8 knockdown attenuates the migration and invasion of HCT116 CRC cells. Subcutaneous or orthotopic injection of HCT116 cells harboring a doxycycline (Dox)-mediated Sur8 knockdown system in nude mice resulted in decreased tumorigenic potential and inhibited the liver metastatic potential of HCT116 cells. Taken together, our data support the role of Sur8 as a promoter of tumorigenesis and liver metastasis in CRC through its modulation of the Ras-ERK and PI3K-Akt signaling pathways. PMID:27469030

  13. Regard sur les lazarets en terre canadienne

    PubMed Central

    Milot, Jean

    2008-01-01

    Puisant dans les nombreuses références qu’offrent les publications médicales canadiennes du milieu du XIXe siècle à nos jours, l’auteur fait découvrir l’existence de lazarets en terre canadienne, décrit l’impact de la maladie sur les conditions vie des lépreux qui y étaient confinés et en souligne les contrecoups tant sur le plan physique et psychologique que social. Il présente un bref aperçu de la maladie, ses symptômes, ses signes ainsi que ses complications oculaires et rappelle les premiers moyens thérapeutiques à base d’huile de chaulmoogra introduits dans la colonie de Tracadie vers 1901. Il illustre son propos en évoquant la vie dans les lazarets de l’île de Sheldrake (1844–1848) et de Tracadie (1848–1965) au Nouveau-Brunswick, puis dans ceux des îles D’Arcy (1891–1924) et de Bentinck (1924–1957) en Colombie-Britannique. PMID:19352451

  14. Adolescence et pornographie sur la toile

    PubMed Central

    Haza, Marion

    2012-01-01

    Dans cet article, nous abordons la question de l’accès à la pornographie sur Internet par les adolescents. Nous déclinons plusieurs facettes de ces rencontres: la rencontre «fortuite», quand les adolescents sont confrontés à des images intempestives, des publicités ou spams avec des contenus pornographiques; la rencontre «spectatrice», quand les adolescents cherchent activement des vidéos ou photos mettant en scène la sexualité; et enfin la rencontre «actrice», quand les adolescents se mettent en scène eux-mêmes, seuls ou à plusieurs, de façon pornographique sur le Net. A partir d’exemple, nous réfléchissons aux enjeux de ces rencontres virtuelles précoces de la sexualité adulte par rapport au développement adolescent et à la représentation de leur propre sexualité en construction. PMID:22876261

  15. AirMSPI PODEX Big Sur Ellipsoid Images

    Atmospheric Science Data Center

    2013-12-11

    ... Browse Images from the PODEX 2013 Campaign   Big Sur target 02/03/2013 Ellipsoid-projected   Select link to ...   Version number   For more information, see the  Data Product Specifications (DPS) ...

  16. Lignes directrices canadiennes sur la rhinosinusite chronique

    PubMed Central

    Kaplan, Alan

    2013-01-01

    Résumé Objectif Présenter un résumé clinique des lignes directrices canadiennes sur la rhinosinusite chronique (RSC) qui comporte des recommandations pertinentes aux médecins de famille. Qualité des données Les auteurs des lignes directrices ont effectué une recherche documentaire systématique dans la littérature médicale et ont rédigé une ébauche de recommandations. Une cote a été donnée à la fois en fonction de la fiabilité des données probantes et de la solidité des recommandations. On a sollicité les commentaires d’experts en contenu de l’extérieur, ainsi que l’aval des sociétés médicales (Association pour la microbiologie médicale et l’infectiologie Canada, Société canadienne d’allergie et d’immunologie clinique, Canadian Society of Otolaryngology—Head and Neck Surgery, Association canadienne des médecins d’urgence et Regroupement canadien des médecins de famille en santé respiratoire). Message principal Le diagnostic d’une RSC se fonde sur le type et la durée des symptômes et une constatation objective d’une inflammation de la muqueuse nasale ou des sinus paranasaux. La rhinosinusite chronique est catégorisée en fonction de la présence ou de l’absence de polypes nasaux et cette distinction entraîne des différences dans le traitement. On traite la rhinosinusite chronique avec polypes nasaux au moyen de corticostéroïdes par voie intranasale. Des antibiotiques sont recommandés quand les symptômes indiquent une infection (douleur ou purulence). Pour une RSC sans polypes nasaux, on recommande des corticostéroïdes par voie intranasale et des antibiotiques de deuxième ligne (par ex. combinaisons amoxicilline–acide clavulanique ou fluoroquinolones à activité accrue contre Gram positif). Une irrigation avec une solution saline, des stéroïdes par voie orale et des tests d’allergies pourraient être appropriées. Si le patient ne répond pas au traitement, il faudrait envisager d

  17. Sulfonylurea receptor -1 (SUR1): genetic and metabolic evidences for a role in the susceptibility to type 2 diabetes mellitus.

    PubMed

    Reis, A F; Velho, G

    2002-02-01

    The pancreatic B-cell ATP-sensitive potassium channel (K(ATP)) is composed of two distinct subunits, an inwardly rectifying ion channel forming the pore (Kir6.2), and a regulatory subunit, namely the sulfonylurea receptor-1 (SUR1), which binds this widely used class of insulin-secreting drugs. Mutations in the genes encoding Kir6.2 and SUR1 may result in familial persistent hyperinsulinemic hypoglycaemia of infancy, demonstrating their role in the regulation of insulin secretion. Studies in various populations with different ethnic background provided evidence that various alleles of single nucleotide polymorphisms (SNPs) in the SUR1 gene, and to a less extent in the Kir6.2 gene, confer a significantly increased risk for the development of type 2 diabetes mellitus (T2DM). Allelic variations of these SNPs were shown to modulate insulin secretion and insulin sensitivity in vivo, thus providing a pathophysiological background to explain their contribution to the genetic susceptibility to T2DM. The aim of this review is to summarise and discuss the significant results of recent literature on the implication of K(ATP), and particularly of SUR1, in the genetic and pathopysiological mechanisms of T2DM.

  18. Internet Discussion Groups.

    ERIC Educational Resources Information Center

    Bull, Glen; Bull, Gina; Sigmon, Tim

    1997-01-01

    Discusses newsgroups, listservs, and Web-based discussion groups. Highlights include major categories of international USENET discussion groups; newsgroups versus mailing lists; newsreaders; news servers; newsgroup subscriptions; newsgroups versus Web discussion groups; linking newsgroups, mailing lists, and the Web; and setting up a news host. A…

  19. Fires Burning near Big Sur, California

    NASA Technical Reports Server (NTRS)

    2008-01-01

    Fires near Big Sur, Calif., continued to burn unchecked when the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra satellite captured this image on Sunday, June 29. In Northern California alone, fires have consumed more than 346,000 acres.At least 18,000 people have deployed to attempt to extinguish or control the flames. Air quality as far away as San Francisco has been adversely impacted by the dense clouds of smoke and ash blowing towards the northwest. The satellite image combines a natural color portrayal of the landscape with thermal infrared data showing the active burning areas in red. The dark area in the lower right is a previous forest fire.

    ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products.

    The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping, and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.

    The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

    Size: 35.4 by 57 kilometers (21.9 by 34.2 miles) Location: 36.1 degrees North latitude, 121.6 degrees West longitude Orientation: North at top Image Data: ASTER bands 3, 2, and 1 Original Data Resolution: 15 meters (49 feet) Dates Acquired: June 29

  20. Effets de la formation sur la violence conjugale

    PubMed Central

    Zaher, Eman; Keogh, Kelly; Ratnapalan, Savithiri

    2014-01-01

    interventions éducatives à multiples facettes prenaient la forme d’ateliers interactifs, d’apprentissage sur le web et de formation expérientielle. Une autre étude utilisait des discussions de groupes témoins et de la formation et a permis de constater une amélioration dans le signalement de la violence conjugale par les médecins. Les 2 autres études ont relevé une meilleure perception par les médecins en pratique de leur confiance en eux à l’aide d’apprentissage par problèmes en ligne. Conclusion Il a été difficile de déterminer quelle stratégie pédagogique était la plus efficace étant donné que les interventions éducatives et les mesures des résultats variaient entre les études choisies. De brèves interventions pour les médecins en formation postdoctorale amélioraient les connaissances mais ne semblaient pas influencer les comportements. La formation en ligne sous forme d’apprentissage par problèmes améliorait les perceptions des médecins en pratique, leurs connaissances et leurs habiletés quant à la prise en charge de la violence conjugale. La formation des médecins combinée à des interventions de soutien de la part du système semblait bénéfique aux victimes de violence conjugale et augmentait le nombre de demandes de consultations auprès des ressources de soutien à leur intention.

  1. Impact de la preparation des anodes crues et des conditions de cuisson sur la fissuration dans des anodes denses

    NASA Astrophysics Data System (ADS)

    Amrani, Salah

    La fabrication de l'aluminium est realisee dans une cellule d'electrolyse, et cette operation utilise des anodes en carbone. L'evaluation de la qualite de ces anodes reste indispensable avant leur utilisation. La presence des fissures dans les anodes provoque une perturbation du procede l'electrolyse et une diminution de sa performance. Ce projet a ete entrepris pour determiner l'impact des differents parametres de procedes de fabrication des anodes sur la fissuration des anodes denses. Ces parametres incluent ceux de la fabrication des anodes crues, des proprietes des matieres premieres et de la cuisson. Une recherche bibliographique a ete effectuee sur tous les aspects de la fissuration des anodes en carbone pour compiler les travaux anterieurs. Une methodologie detaillee a ete mise au point pour faciliter le deroulement des travaux et atteindre les objectifs vises. La majorite de ce document est reservee pour la discussion des resultats obtenus au laboratoire de l'UQAC et au niveau industriel. Concernant les etudes realisees a l'UQAC, une partie des travaux experimentaux est reservee a la recherche des differents mecanismes de fissuration dans les anodes denses utilisees dans l'industrie d'aluminium. L'approche etait d'abord basee sur la caracterisation qualitative du mecanisme de la fissuration en surface et en profondeur. Puis, une caracterisation quantitative a ete realisee pour la determination de la distribution de la largeur de la fissure sur toute sa longueur, ainsi que le pourcentage de sa surface par rapport a la surface totale de l'echantillon. Cette etude a ete realisee par le biais de la technique d'analyse d'image utilisee pour caracteriser la fissuration d'un echantillon d'anode cuite. L'analyse surfacique et en profondeur de cet echantillon a permis de voir clairement la formation des fissures sur une grande partie de la surface analysee. L'autre partie des travaux est basee sur la caracterisation des defauts dans des echantillons d'anodes crues

  2. Finding the SurPriSe: A Case Study of a Faculty Learning Community

    ERIC Educational Resources Information Center

    Michel, Roberta M.

    2014-01-01

    This article details a faculty learning community (FLC) that started in 2009 on the campus of a Midwestern University and has evolved into an interdisciplinary research, teaching and social community of practice and learning called SurPriSe. SurPriSe is an acronym that reflects the interest area of the FLC; Sur for surveillance, Pri for privacy,…

  3. The Use of Discussion.

    ERIC Educational Resources Information Center

    Brunner, Edmund deS.; And Others

    Research on the use of discussion in adult education has been largely concerned with comparing it with the use of other instructional techniques and with measuring opinion change. Many studies, such as Kurt Lewin's study of food habits, have compared the effectiveness of group discussion as contrasted with lecture in changing opinions and…

  4. Leading Classroom Discussions

    ERIC Educational Resources Information Center

    Gonzalez, Gloriana; DeJarnette, Anna F.

    2013-01-01

    Classroom discourse is a valuable teaching and learning tool. Discussions allow students to improve their communication and reasoning skills in mathematics and help teachers assess students' understanding of mathematical ideas. To get the greatest benefit from discussion, teachers must elicit student thinking, listen carefully to their ideas,…

  5. Framing Evolution Discussion Intellectually

    ERIC Educational Resources Information Center

    Oliveira, Alandeom W.; Cook, Kristin; Buck, Gayle A.

    2011-01-01

    This study examines how a first-year biology teacher facilitates a series of whole-class discussions about evolution during the implementation of a problem-based unit. A communicative theoretical perspective is adopted wherein evolution discussions are viewed as social events that the teacher can frame intellectually (i.e., present or organize as…

  6. Constraints on thermal histories of magmas from combined U-series crystal ages, trace-element diffusion, and textural information

    NASA Astrophysics Data System (ADS)

    Cooper, K. M.; Kent, A. J.

    2012-12-01

    Developing a better understanding of the thermal and chemical evolution of magmas within crustal reservoirs has implications both in terms of the mechanisms of generation of chemically diverse magmas and in terms of the development, size and longevity of bodies of eruptible magma. The physical and thermal states of the system are intimately linked, going from mostly liquid to mushy to potentially solid or almost-solid systems as a function largely of temperature. Crystal-scale records show evidence of long-term storage and recycling of crystals within a reservoir system, but the extent to which storage of these antecrysts occurs in mostly-liquid vs. mostly-solid or solid bodies is unclear. Numerical models can provide insights into thermal histories at a reservoir scale, and crystal and liquid thermometry can provide insights into the thermal state of the crystals at snapshots in time, but developing thermal histories from the record in erupted products has been elusive. We present a new approach to quantifying thermal histories of magma bodies using the crystal record by combining information from multiple analytical approaches. U-series crystal ages provide the total time since crystals grew (albeit averaged). In contrast, trace-element zoning provides an uppper limit to the duration of storage at high temperatures, and crystal sizes and CSDs provide insights into the total growth time of crystals (modified by dissolution). Thus, by combining information from all of these sources, we can link the crystal growth and diffusion ages to thermal states and therefore constrain thermal histories. We use recent eruptive products at Mt Hood as a case study, building off of previous 238U-230Th-226Ra crystal age, CSD, and diffusion modeling results. 230Th-226Ra ages of crystals from the silicic endmember of the most recent Mt Hood eruptions both have average ages of >4.5 ka and likely have cores with ages >10 ka (Eppich et al., EPSL, 2012 v. 317-318). Diffusion of Sr in

  7. Assessing Natural Radionuclide Migration in the Legacy Tailings of Uranium Production

    NASA Astrophysics Data System (ADS)

    Bondarenko, G.; Koliabina, I.; Marinich, O.

    2011-12-01

    - 230Th - 226Ra - 210Pb decay chain, typical for closed systems, has been disturbed during selective chemical uranium extraction from the parent ore. We calculated the migration of 210Pb, assuming constant 226Ra activity. The results of these calculations show that over 50 years, ~18% of the initial (unknown) 210Pb(0) activity was removed. If we assume removal of 226Ra decay products will continue at the current level, we expect the future annual activity loss of 210Pb to be about 0.36% per year, or 0.072 Bq/g. Assuming the examined core sample is representative of all 12 million tons of tails, the total annual activity loss is estimated to be ~1012 Bq/year. These results allow us to conclude that the loss of activity from the tailing pit by water migration is mainly associated with the 226Ra decay products: 222Rn, 210Pb, 210Po.
    Activity ratios, Dnieper tailings

  8. Rapid crystal recycling at Krafla Volcano, Iceland, inferred from oxygen-isotope and trace- element compositions and U-Th-Ra disequilibria in plagioclase

    NASA Astrophysics Data System (ADS)

    Cooper, K. M.; Sims, K. W.; Eiler, J. M.; Banerjee, N. R.

    2008-12-01

    The Icelandic central volcano of Krafla exhibits increasing assimilation of hydrothermally-altered crust with increasing differentiation of magmas, as evidenced by decreasing δ18O with decreasing MgO (Nicholson et al., 1991, J Pet 32, p.1005). The Krafla Fires eruption (1975-84) produced two different magma compositions simultaneously: quartz tholeiites near the center of the volcano, and olivine tholeiites north of the central volcano (Gronvold et al., 2008, Goldschmidt abstract). Examination of crystals in these magmas has the potential to provide information about the nature and timescales of mixing of distinct magmas and assimilation of crustal material at Krafla. We present oxygen-isotope compositions, trace-element compositions, and 238U-230Th-226Ra disequilibria measured in plagioclase crystals from samples of lavas erupted during two phases of the Krafla Fires eruption (ol tholeiite erupted Jan-Feb 1981, and qz tholeiite erupted Nov 1981). Oxygen-isotope data for multiple size fractions of plagioclase show a decrease in δ18O with increasing crystal size for the ol tholeiite (from ~4.1 permil to 3.5 permil), whereas there is no clear relationship between plagioclase size and oxygen-isotope composition in the qtz tholeiite (all size fractions average 4.1-4.3 permil). Furthermore, all measured plagioclase have δ18O lower than would be in equilibrium with the whole rock measurements (by up to 1.5 permil). These data imply that (1) few or none of the measured crystals precipitated from the host liquids, and (2) the crystals were entrained in the host magmas shortly prior to eruption, allowing them to maintain oxygen isotopic disequilibrium and heterogeneity within the crystal populations. These inferences are corroborated by trace element compositions measured in plagioclase by laser-ablation ICPMS, as the majority of analyzed points have Ba and Sr concentrations inconsistent with equilibrium partitioning between crystals and liquid. Furthermore, in the case

  9. Cryptic young zircon and young plagioclase in the Kaharoa Rhyolite, Tarawera, New Zealand: Implications for crystal recycling in magmatic systems

    NASA Astrophysics Data System (ADS)

    Klemetti, E. W.; Cooper, K. M.

    2007-12-01

    We measured in-situ 238U-230Th zircon and bulk plagioclase 238U-230Th-226Ra disequilibria in rhyolite lava and tephra from the ~1315 AD Kaharoa eruption of Tarawera Volcano, New Zealand in order to constrain its history of chemical evolution. These data suggest that zircon records a protracted history (10s of kyr) whereas plagioclase is dominantly young (few kyr), but both phases crystallize up to the eruption. The Kaharoa eruptive period at Tarawera consists of ~2.5 km3 of crystal-rich rhyolite (74-75 wt% silica) lava and ~5 km3 of coeval tephra deposits, making it the largest silicic eruption in New Zealand in the last 1,000 years. 238U-230Th disequilibria measurements of zircon determined via SHRIMP-RG analyses produce an array of ages, with three main populations: (1) within error of eruption age; (2) 15-80 k.y.; (3) 100-175 k.y. Very few analyzed zircon fall within error of eruption age and little difference is seen in the age distribution of zircon between the lava and tephra. In contrast, 238U-230Th and 230Th-226Ra plagioclase ages appear to be within error of eruption age however this age is complicated zircon inclusions in the plagioclase. This contamination by zircon is seen in the 238U-230Th disequilibria and trace element data, where the addition of zircon pushes the bulk plagioclase separate towards more U-enriched values and high Zr values. However, the (230Th)/(232Th) ratios for the separates are the same as the whole rock values, indicating that any zircon in the bulk separate must be young (eruption age). This finding is also borne out in 230Th-226Ra disequilibria, where zero-age zircon contamination is reflected in increased (230Th)/[Ba] with no change in (226Ra)/[Ba]. In both cases, as little as 1 ppm of zero-age zircon contamination is needed to create these patterns. This signal of young plagioclase and zircon growth is in contrast to the protracted history seen in the SHRIMP-RG zircon data. This suggests that young zircon growth in the Kaharoa

  10. Le point sur les amas de galaxies

    NASA Astrophysics Data System (ADS)

    Pierre, M.

    galaxies jouent donc un rôle de premier plan dans toute étude cosmologique et par conséquent, sont indispensables à notre compréhension globale de l'univers. Dans l'introduction générale, nous détaillons cet aspect fondamental en montrant comment l'étude des amas peut contribuer à contraindre les scénarios cosmologiques. Une fois le contexte scientifique délimité, les chapitres suivants s'attachent à présenter les diverses propriétés des amas et leur évolution cosmique observée dans diverses longueurs d'onde principalement dans les domaines visible (galaxies), X (gaz) et radio (gaz et particules). Nous verrons que l'étude détaillée d'un amas implique celle de l'interaction entre ses différentes composantes et est un passage obligé pour remonter au paramètre ultime (ou premier) qu'est sa masse. Loin d'être un détour ennuyeux, ceci sera l'occasion d'aborder des phénomènes physiques extrêmement variés tel l'aspect multi-phases du milieu intra-amas, les sursauts de formation d'étoiles et l'évolution morphologique des galaxies capturées par les amas, ou bien encore, l'interaction entre le plasma intra-amas et les particules relativistes accélérées lors de la fusion entre deux amas. Bien sûr, pour chaque longueur d'onde, nous ne manquerons pas de décrire simplement les techniques d'observation et d'analyse mises en oeuvre ; celles-ci sont particulièrement intéressantes dans le cas de l'instrumentation spatiale. Nous terminerons en présentant des projets d'observatoires pour l'horizon 2010 et leur impact prévu sur l'étude des amas de galaxies.

  11. John Cage Discusses Fluxus.

    ERIC Educational Resources Information Center

    Snyder, Ellsworth

    1992-01-01

    Presents an informal discussion with composer John Cage which includes his response to George Maciunas' work, his recollections of Marcel Duchamp, the complex relationship between inelegant material and revealing works of art, neo-Dada and neo-Fluxus, Wittgenstein and the artist's ultimate responsibility to initiate a change in the viewer or…

  12. Facilitating Productive Discussions

    ERIC Educational Resources Information Center

    Cengiz, Nesrin

    2013-01-01

    Whole-group classroom discussions about solutions allow teachers to promote reasoning that moves students beyond merely noticing mathematical ideas toward developing a well-connected knowledge of concepts. Creating classroom environments where teachers promote reasoning and engage students in investigating important mathematical phenomena is…

  13. Framing Discussions about Teaching

    ERIC Educational Resources Information Center

    Danielson, Charlotte

    2015-01-01

    Danielson's Framework for Teaching has provided a common language for discussions of teaching practice for almost 20 years. Many educators love the Framework's comprehensiveness; they find the specific language to be useful as they strive to improve their practice. For other educators, however, the Framework's 22 components and 76 smaller elements…

  14. Promoting Lively Literature Discussion

    ERIC Educational Resources Information Center

    Gritter, Kristine

    2011-01-01

    When students create personal connections with literature during whole-class discussion, they make sense both of text and of their life experiences. In this article, the author shares tips that help students make text-to-self, text-to-world, and text-to-text connections. She offers classroom examples to illustrate how conversations that encourage…

  15. DISCUSSION ON MENINGITIS

    PubMed Central

    1929-01-01

    (1) Meningitis: two groups of cases. (2) A method of washing out the subarachnoid space in cases of septic meningitis secondary to infection of the ear. (3) Discussion on the value of maintaining a positive pressure of the cerebrospinal fluid when operating on a septic region communicating with the subarachnoid space. (4) Leaking cerebrospinal fluid from the region of the ear: operative treatment. PMID:19986899

  16. PA Discussion Topics

    DTIC Science & Technology

    2011-02-04

    Vehicle Power & Mobility PA Discussion Topics UNCLASSIFIED: Dist A. Approved for public releas Report Documentation Page Form ApprovedOMB No. 0704...0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions...Headquarters Services, Directorate for Information Operations and Reports , 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302

  17. Clinicians Discuss Diaper Dermatitis.

    PubMed

    Brucker, Mary; McGuire, Stephanie; Merrill, Lisa; Rossing, Francine; Sayaseng, Kammi

    2015-01-01

    Diaper dermatitis in infants is commonly seen by clinicians in both primary care and acute care settings. The condition can cause significant discomfort for infants and distress for their parents and caregivers. Nursing for Women's Health convened a group of nursing clinicians who work in a variety of settings to discuss the issues and challenges related to preventing and treating diaper dermatitis in both healthy term newborns and premature newborns.

  18. Etude des effets du martelage repetitif sur les contraintes residuelles

    NASA Astrophysics Data System (ADS)

    Hacini, Lyes

    L'assemblage par soudage peut engendrer des contraintes residuelles. Ces contraintes provoquent des fissurations prematurees et un raccourcissement de la duree de vie des composants. Dans ce contexte, le martelage robotise est utilise pour relaxer ces contraintes residuelles. Trois volets sont presentes: le premier est l'evaluation des effets des impacts unitaires repetes sur le champ de contraintes developpe dans des plaques d'acier inoxydable austenitique 304L vierges ou contenant des contraintes residuelles initiales. Dans la deuxieme partie de ce projet, le martelage est applique grace au robot SCOMPI. Les contraintes residuelles induites et relaxees par martelage sont ensuite mesurees par la methode des contours, qui a ete adaptee a cet effet. Dans la troisieme partie, le martelage est modelise par la methode des elements finis. Un modele axisymetrique developpe grace au logiciel ANSYS permet de simuler des impacts repetes d'un marteau elastique sur une plaque ayant un comportement elastoplastique.

  19. Programmes d’apprentissage en petit groupe basé sur la pratique

    PubMed Central

    Zaher, Eman; Ratnapalan, Savithiri

    2012-01-01

    Résumé Objectif Identifier la forme, le contenu et les effets des programmes d’apprentissage en petit groupe basé sur la pratique (APGBP) auxquels participent des MF. Source des données On a fait une recherche dans les bases de données Ovide MEDLINE, EMBASE et ERIC, de leur création jusqu’à la deuxième semaine de novembre 2011, qui a produit 99 articles. Sélection des études On a inclus dans l’analyse les articles qui décrivaient la forme ou le contenu ou évaluaient des programmes d’APGBP auxquels participaient des MF, c’est-à-dire 13 articles. Synthèse Il existe 2 principales formes d’APGBP. La première est un apprentissage autodirigé, qui comporte un examen et des discussions de cas de patients problématiques ou difficiles. Le contenu de tels programmes varie selon les différents styles d’enseignement. La deuxième forme cible des problèmes particuliers tirés de la pratique pour améliorer certaines connaissances et habiletés ou encore mettre en œuvre de nouveaux guides de pratique en utilisant des cas de patients pour stimuler la discussion du sujet choisi. Les 2 formes se ressemblent sur le plan de l’objectif ultime, sont d’égale importance et sont bien acceptées des apprenants et des facilitateurs. Les évaluations des perceptions des apprenants et des résultats de l’apprentissage indiquent que l’APGBP constitue une méthode pratique et efficace de développement professionnel. Conclusion Les données actuelles font valoir que l’APGBP est une méthode prometteuse de développement professionnel continu pour les MF. De tels programmes peuvent être adaptés en fonction des besoins d’apprentissage. De futures études qui insistent sur les changements dans la pratique découlant de l’APGBP renforceront les données probantes à l’appui de cette forme d’apprentissage et motiveront les médecins et les établissements à l’adopter.

  20. China's satellite communications discussed

    NASA Astrophysics Data System (ADS)

    Ruhou, Z.

    1986-04-01

    In 1972, China began to enter the age of satellite comunications, and it was realized that satellites could play a large role in television transmission in China. The experimental broadcasting of satellite television programs was begun in 1978, and satisfactory results were obtained. The success of the television transmission demonstration has led to important decisions regarding development of a domestic satellite communications system. Before specialized communications satellites are launched, the decision was made to lease an international communications satellite transmitter. The responsibility of the ground stations were discussed.

  1. Discussion of optoelectronic HMDASS

    NASA Astrophysics Data System (ADS)

    Liu, Yu; Liu, Xu; Yang, Yi; Sun, Longhe; Liu, Hua

    2000-10-01

    The use of opto-electronic Helmet Mounted Display And Sight System (HMDASS) will decrease responding time for fighter in near distance tussle. See-through type Helmet Mounted Display (HMD), instead of the simple graduation board display, will provide more information and so much as integrate the FLTR image. We research some questions of TFTLCD device in optic- electric HMDASS application, such as luminance, information content & format etc. This paper discuss the luminance question in perspective type LCD-HMD and put forward a display method to increase the reaction velocity for a pilot using opto-electronic Helmet Mounted Sight (HMS).

  2. Empowerment: a conceptual discussion.

    PubMed

    Tengland, Per-Anders

    2008-06-01

    The concept of 'empowerment' is used frequently in a number of professional areas, from psychotherapy to social work. But even if the same term is used, it is not always clear if the concept denotes the same goals or the same practice in these various fields. The purpose of this paper is to clarify the discussion and to find a plausible and useful definition of the concept that is suitable for work in various professions. Several suggestions are discussed in the paper, for example control over life or health, autonomy, ability, self-efficacy, self-esteem, and freedom, and it is concluded that there are two plausible complementary uses, one as a goal and one as a process or approach. Empowerment as a goal is to have control over the determinants of one's quality of life, and empowerment as a process is to create a professional relation where the client or community takes control over the change process, determining both the goals of this process and the means to use.

  3. Effets des electrons secondaires sur l'ADN

    NASA Astrophysics Data System (ADS)

    Boudaiffa, Badia

    Les interactions des electrons de basse energie (EBE) representent un element important en sciences des radiations, particulierement, les sequences se produisant immediatement apres l'interaction de la radiation ionisante avec le milieu biologique. Il est bien connu que lorsque ces radiations deposent leur energie dans la cellule, elles produisent un grand nombre d'electrons secondaires (4 x 104/MeV), qui sont crees le long de la trace avec des energies cinetiques initiales bien inferieures a 20 eV. Cependant, il n'y a jamais eu de mesures directes demontrant l'interaction de ces electrons de tres basse energie avec l'ADN, du principalement aux difficultes experimentales imposees par la complexite du milieu biologique. Dans notre laboratoire, les dernieres annees ont ete consacrees a l'etude des phenomenes fondamentaux induits par impact des EBE sur differentes molecules simples (e.g., N2, CO, O2, H2O, NO, C2H 4, C6H6, C2H12) et quelques molecules complexes dans leur phase solide. D'autres travaux effectues recemment sur des bases de l'ADN et des oligonucleotides ont montre que les EBE produisent des bris moleculaires sur les biomolecules. Ces travaux nous ont permis d'elaborer des techniques pour mettre en evidence et comprendre les interactions fondamentales des EBE avec des molecules d'interet biologique, afin d'atteindre notre objectif majeur d'etudier l'effet direct de ces particules sur la molecule d'ADN. Les techniques de sciences des surfaces developpees et utilisees dans les etudes precitees peuvent etre etendues et combinees avec des methodes classiques de biologie pour etudier les dommages de l'ADN induits par l'impact des EBE. Nos experiences ont montre l'efficacite des electrons de 3--20 eV a induire des coupures simple et double brins dans l'ADN. Pour des energies inferieures a 15 eV, ces coupures sont induites par la localisation temporaire d'un electron sur une unite moleculaire de l'ADN, ce qui engendre la formation d'un ion negatif transitoire

  4. From Bretonneau to therapeutic antibodies, from specificity to specific remedies, Saint-Cyr-Sur-Loire, France, November 19, 2012

    PubMed Central

    Marchand, Claire; Nouat, Romaric; Watier, Hervé

    2013-01-01

    Held on November 19, 2012 in Saint-Cyr-sur-Loire, France, the symposium “From Bretonneau to therapeutic antibodies, from specificity to specific remedies” focused on the historical development of antibodies as therapeutics, with an emphasis on the seminal work of the French physician Pierre-Fidèle Bretonneau (1778–1862). The morning session was devoted to discussion of the evolution of the concept of specificity in medicine, which started with an epistemological definition. The contributions of Bretonneau to the emergence of the concept of specificity, notably with his studies on diphtheria, and the subsequent development of antidiphtheric serotherapy in Europe during the period 1894–1898 were then presented in detail. The afternoon session began with a presentation on the role of French physiologists during the years 1860–1890 in establishing the basic concepts of specific immunity and the principles of serotherapy. The history of antivenom serotherapy, particularly its discovery by Césaire Phisalix, and the development of antilymphocyte globulins as successful transplantation drugs were then discussed. The symposium ended with the inauguration of a stele representing Bretonneau, who lived in Saint-Cyr-sur-Loire and died 150 y ago. PMID:23924799

  5. Lignes directrices simplifiées sur les lipides

    PubMed Central

    Allan, G. Michael; Lindblad, Adrienne J.; Comeau, Ann; Coppola, John; Hudson, Brianne; Mannarino, Marco; McMinis, Cindy; Padwal, Raj; Schelstraete, Christine; Zarnke, Kelly; Garrison, Scott; Cotton, Candra; Korownyk, Christina; McCormack, James; Nickel, Sharon; Kolber, Michael R.

    2015-01-01

    Résumé Objectif Produire un guide de pratique clinique comportant une approche simplifiée à la prévention primaire des maladies cardiovasculaires (MCV), en insistant sur l’estimation du risque de MCV et la prise en charge des profils lipidiques à l’intention des cliniciens de soins primaires et leurs équipes; nous avons recherché la contribution de professionnels des soins primaires qui n’avaient que peu ou pas de conflits d’intérêts et nous nous sommes concentrés sur les données probantes de la plus haute qualité accessibles. Méthodes Neuf professionnels de la santé (4 médecins de famille, 2 internistes, 1 infirmière praticienne, 1 infirmière autorisée et 1 pharmacienne) et 1 membre non votant (pharmacienne gestionnaire de projet) formaient le comité principal appelé le Lipid Pathway Committee (le comité). La sélection des membres s’est fondée sur la profession, le milieu de pratique et son emplacement. Les membres ont divulgué tous leurs conflits d’intérêts potentiels ou réels. Le processus d’élaboration des lignes directrices était itératif et s’appuyait sur des affichages en ligne, une révision détaillée des données probantes, des réunions par téléphone et en ligne. Le comité a cerné 12 questions prioritaires à répondre. Le groupe de révision des données probantes a répondu à ces questions. À la suite d’un examen des réponses, les principales recommandations ont été formulées par consensus du comité. Nous avons produit une ébauche des lignes directrices qui a ensuite été peaufinée, distribuée à un groupe de cliniciens (médecins de famille, autres spécialistes, pharmaciens, infirmières et infirmières praticiennes) et à des patients pour obtenir de la rétroaction, la réviser en conséquence et le comité l’a ensuite finalisée. Recommandations Des recommandations sont présentées concernant le dépistage et les analyses, les évaluations du risque, le suivi, de même que le r

  6. Human Cloning: Let's Discuss It.

    ERIC Educational Resources Information Center

    Taras, Loretta; Stavroulakis, Anthea M.; Ortiz, Mary T.

    1999-01-01

    Describes experiences with holding discussions on cloning at a variety of levels in undergraduate biology courses. Discusses teaching methods used and student reactions to the discussions. Contains 12 references. (WRM)

  7. Structure of thermotoga maritima stationary phase survival protein SurE : a novel acid phosphatase.

    SciTech Connect

    Zhang, R.-G; Skarina, T.; Katz, J. E.; Khachatryan, A; Vyas, S.; Arrowsmith, C. H.; Clarke, S.; Edwards, A.; Joachimiak, A.; Savchenko, A.; Biosciences Division; Univ. of Toronto; Univ. of California; Clinical Genomics Centre /Proteomics, Univ. Health Network

    2001-11-01

    Background: The rpoS, nlpD, pcm, and surE genes are among many whose expression is induced during the stationary phase of bacterial growth. rpoS codes for the stationary-phase RNA polymerase {sigma} subunit, and nlpD codes for a lipoprotein. The pcm gene product repairs damaged proteins by converting the atypical isoaspartyl residues back to L-aspartyls. The physiological and biochemical functions of surE are unknown, but its importance in stress is supported by the duplication of the surE gene in E. coli subjected to high-temperature growth. The pcm and surE genes are highly conserved in bacteria, archaea, and plants. Results: The structure of SurE from Thermotoga maritima was determined at 2.0 Angstroms. The SurE monomer is composed of two domains; a conserved N-terminal domain, a Rossman fold, and a C-terminal oligomerization domain, a new fold. Monomers form a dimer that assembles into a tetramer. Biochemical analysis suggests that SurE is an acid phosphatase, with an optimum pH of 5.5-6.2. The active site was identified in the N-terminal domain through analysis of conserved residues. Structure-based site-directed point mutations abolished phosphatase activity. T. maritima SurE intra- and intersubunit salt bridges were identified that may explain the SurE thermostability. Conclusions: The structure of SurE provided information about the protein's fold, oligomeric state, and active site. The protein possessed magnesium-dependent acid phosphatase activity, but the physiologically relevant substrate(s) remains to be identified. The importance of three of the assigned active site residues in catalysis was confirmed by site-directed mutagenesis.

  8. Discussion

    NASA Astrophysics Data System (ADS)

    Marshall, Tim

    Presenter, Jim McDonald, Texas Tech University [McDonald, this volume, Damage mitigation and occupant safety]. (Arnold Court, California State University.) Can you tell me how to park my car to mitigate tornado damage?

  9. Discussion

    NASA Astrophysics Data System (ADS)

    Crawford, K.

    Presenter, T. P. Grazulis, private consultant [Grazulis et al., this volume, advances in tornado climatology, hazards, and risk assessment since Tornado Symposium II]. (C. Anderson, North Carolina State University.) At one time, I lived in Wisconsin and used to consider tornado climatology there. I noticed some very strange reporting, also. There were a number of counties along the Lake Michigan shore that showed no reported tornadoes from 1915 to 1950. Did you find something like this as well?

  10. SUR1-Associated Mechanisms Are Not Involved in Ischemic Optic Neuropathy 1 Day Post-Injury

    PubMed Central

    Nicholson, James D.; Guo, Yan; Bernstein, Steven L.

    2016-01-01

    Ischemia-reperfusion injury after central nervous system (CNS) injury presents a major health care challenge with few promising treatments. Recently, it has become possible to reduce edema after CNS injury by antagonizing a sulfonylurea receptor 1 (SUR1) regulated ion channel expressed after injury. SUR1 upregulation after injury is a necessary precondition for the formation of this channel, and has been implicated in white matter injury after clinical spinal cord trauma. Glibenclamide, an SUR1 antagonist, appears to have neuroprotective effect against cerebral stroke in an open-label small clinical trial and great effectiveness in reducing damage after varied experimental CNS injury models. Despite its importance in CNS injuries, SUR1 upregulation appears to play no part in rodent anterior ischemic optic neuropathy (rAION) injury as tested by real-time PCR and immunohistochemical staining of rAION-injured rat optic nerve (ON). Furthermore, the SUR1 antagonist glibenclamide administered immediately after rAION injury provided no protection to proximal ON microvasculature 1 day post-injury but may reduce optic nerve head edema in a manner unrelated to ON SUR1 expression. Our results suggest that there may be fundamental differences between rAION optic nerve ischemia and other CNS white matter injuries where SUR1 appears to play a role. PMID:27560494

  11. [Marine algae of Baja California Sur, Mexico: nutritional value].

    PubMed

    Carrillo Domínguez, Silvia; Casas Valdez, Margarita; Ramos Ramos, Felipe; Pérez-Gil, Fernando; Sánchez Rodríguez, Ignacio

    2002-12-01

    The Baja California Peninsula is one of the richest regions of seaweed resources in México. The objective of this study was to determine the chemical composition of some marine algae species of Baja California Sur, with an economical potential due to their abundance and distribution, and to promote their use as food for human consumption and animal feeding. The algae studied were Green (Ulva spp., Enteromorpha intestinalis, Caulerpa sertularoides, Bryopsis hypnoides), Red (Laurencia johnstonii, Spyridia filamentosa, Hypnea valentiae) and Brown (Sargassum herporizum, S. sinicola, Padina durvillaei, Hydroclathrus clathrathus, Colpomenia sinuosa). The algae were dried and ground before analysis. In general, the results showed that algae had a protein level less than 11%, except L. johnstonii with 18% and low energy content. The ether extract content was lower than 1%. However, the algae were a good source of carbohydrates and inorganic matter.

  12. A Discussion with Jacques Derrida.

    ERIC Educational Resources Information Center

    Derrida, Jacques

    1990-01-01

    Presents an edited transcript of a discussion held in April 1989 between Jacques Derrida and a group of students and professors concerning Derrida's "Afterword: Toward an Ethic of Discussion." Discusses Derrida's views on "deconstruction" as a term and a movement, the idea of arguments and persuasion, and specific power…

  13. Taos Smart Growth Implementation Assistance: Concepts for the Paseo del Pueblo Sur Corridor

    EPA Pesticide Factsheets

    This report describes a technical assistance project with Taos, NM, to help make development along State Highway 68, the Paseo del Pueblo Sur commercial corridor, economically stronger and more attractive.

  14. Enquete sur les aspects toxicologiques de la phytotherapie utilisee par un herboriste à Fes, Maroc

    PubMed Central

    Zeggwagh, Ali Amine; Lahlou, Younes; Bousliman, Yassir

    2013-01-01

    Introduction Dans le but d'étudier l'aspect toxicologique des plantes médicinales utilisées en médecine traditionnelle, une étude ethnobotanique a été réalisée à la ville de Fès au centre du Maroc. Méthodes Ont été inclus dans l'étude tous les patients ayant bénéficié d'une prescription par l'herboriste de plantes à visée thérapeutique. La discussion de nos résultats s'est faite sur la base d'une revue de la littérature avec identification des principales plantes toxiques utilisées en phytothérapie au Maroc. L'approche bibliographique a permis de compléter les informations. Résultats L'âge moyen des patients traités par des plantes (38 femmes, 32 hommes) était de 35 ± 18 ans. L'enquête ethnobotanique à révélé que la majorité des plantes médicinales étaient utilisées contre les affections urinaires (21%), suivi des maladies de l'appareil digestif (19.6%) et des maladies rhumatologiques (18.2%). Le nombre de plantes prescrits par l'herboriste a été de 53 dont 5 sont potentiellement toxiques. L'identification taxonomique des plantes prescrites a recensé 30 familles dont les plus représentées sont les Lamiaceae (23.33%), les Apiaceae (13,33%) et les Asteraceae (10%). La prescription des plantes considérées comme toxiques a concerné 7,1% des consultants traités par les plantes médicinales. Aucune complication inhérente aux plantes prescrites n'a été déplorée. Conclusion Malgré les résultats encourageants de notre enquête sur le compte de la phytothérapie, la pratique de la phytothérapie est laissée à la vulgarisation et à l'oubli scientifique, législatif et universitaire. PMID:23734270

  15. Chemical Kinetics Laboratory Discussion Worksheet.

    PubMed

    Demoin, Dustin Wayne; Jurisson, Silvia S

    2013-09-10

    A laboratory discussion worksheet and its answer key provide instructors and students a discussion model to further the students' understanding of chemical kinetics. This discussion worksheet includes a section for students to augment their previous knowledge about chemical kinetics measurements, an initial check on students' understanding of basic concepts, a group participation model where students work on solving complex-conceptual problems, and a conclusion to help students connect this discussion to their laboratory or lecture class. Additionally, the worksheet has a detailed solution to a more advanced problem to help students understand how the concepts they have put together relate to problems they will encounter during later formal assessments.

  16. Chemical Kinetics Laboratory Discussion Worksheet

    PubMed Central

    Demoin, Dustin Wayne; Jurisson, Silvia S.

    2013-01-01

    A laboratory discussion worksheet and its answer key provide instructors and students a discussion model to further the students’ understanding of chemical kinetics. This discussion worksheet includes a section for students to augment their previous knowledge about chemical kinetics measurements, an initial check on students’ understanding of basic concepts, a group participation model where students work on solving complex-conceptual problems, and a conclusion to help students connect this discussion to their laboratory or lecture class. Additionally, the worksheet has a detailed solution to a more advanced problem to help students understand how the concepts they have put together relate to problems they will encounter during later formal assessments. PMID:24092948

  17. Promoting Discussions in ESL Students

    ERIC Educational Resources Information Center

    Navarro, Ann

    2010-01-01

    Background: Teachers who work with English as a Second Language (ESL) students, struggle with promoting discussion during guided reading. When ESL students are asked comprehension questions during group discussions and throughout the reading of a book, often teachers receive minimal feedback. Purpose: The purpose of this research is to identify…

  18. Sur Lago area, Venezuela: Three dimensional integrated seismic interpretation

    SciTech Connect

    Growcott, A.; McIan, A.; Ramirez, R. )

    1993-02-01

    In 1988, 550 square km of 3D seismic data were acquired in the Sur Del Lago area. The aims of the survey were (1) To better define structures already identified from the existing 1 [times] 1 km 2D seismic grid at the level of potential Cretaceous limestone reservoirs and (2) To further study the prospectivity of potential structural and stratigraphic traps within the Tertiary section. Detailed interpretation of the 3D survey using an interactive workstation led to an improved structural definition at the Cogollo limestone level and the identification of fault related inversion lineaments and basement related Cretaceous limestone structures. Based upon the new seismic interpretation a 4 well exploration project was planned. The new program commenced with the drilling of exploration well SLA-7-IX in 1991 which proved commercial amounts of hydrocarbons in the western part of the area. Detailed information collected from the exploration wells includes a comprehensive electric log suite, ditch cuttings and vertical seismic profiles. The information is being used as detailed lithological, stratigraphic and seismic data input for velocity modeling, ray trace modeling, seismic attribute analysis, and reservoir characterization software in order to further understand the structural and stratigraphic potential of the area.

  19. A functional role of the C-terminal 42 amino acids of SUR2A and SUR2B in the physiology and pharmacology of cardiovascular ATP-sensitive K(+) channels.

    PubMed

    Yamada, Mitsuhiko; Kurachi, Yoshihisa

    2005-07-01

    The ATP-sensitive K(+) (K(ATP)) channel is composed of four pore-forming Kir6.2 subunits and four sulfonylurea receptors (SUR). Intracellular ATP inhibits K(ATP) channels through Kir6.2. SUR is an ABC protein bearing transmembrane domains and two nucleotide-binding domains (NBD1 and NBD2). SUR increases the open probability of K(ATP) channels by interacting with ATP and ADP through NBDs and with K(+) channel openers such as nicorandil through its transmembrane domain. Because NBDs and the drug receptor allosterically interact with each other, nucleotides and drugs probably activate K(ATP) channels by causing the same conformational change of SUR. SUR2A and SUR2B have the identical drug receptor and NBDs and differ only in the C-terminal 42 amino acids (C42). Nonetheless, nicorandil ~100 times more potently activates SUR2B/Kir6.2 than SUR2A/Kir6.2 channels. Based on our allosteric model, we have analyzed the interaction between NBDs and the drug receptor in SUR2A and SUR2B and found that both nucleotide-bound NBD1 and NBD2 more strongly induce the conformational change in SUR2B than SUR2A. Therefore, C42 modulates the function of not only NBD2 which is close to C42 in a primary structure but NBD1 which is more than 630 amino acid N-terminal to C42. This raises the possibility that in the presence of nucleotides, NBD1 and NBD2 dimerize to induce the conformational change and that the dimerization enables C42 to gain access to both NBDs. Modulation of the nucleotide-NBD1 and -NBD2 interactions by C42 would determine the stability of the nucleotide-dependent dimer and thus, the physiological and pharmacological properties of K(ATP) channels.

  20. Socrates, discussion and moral education

    NASA Astrophysics Data System (ADS)

    Rembert, Ron B.

    1995-01-01

    For Socrates, as he appears in Plato's dialogues, the process of discussion is essential for preparing human beings to lead a moral life. Only through discussion, Socrates maintains, can we be led to an understanding of such concepts as wisdom, courage and justice. The author of this article believes that the Socratic notion of the moral value of discussion is still valid. In support of this view, he examines two recent works: Dialogues on Moral Education by John Wilson and Barbara Cowell, and Moral Education, Secular and Religious by John L. Elias. Finally, the author suggests how the Socratic concept of dialogue might be used in moral education today.

  1. Discussion of "interpretation and play".

    PubMed

    Pick, Irma Brenman

    2011-01-01

    This discussion addresses the conflict in technique between play versus interpretation. It further considers how the nature of the interpretation may be affected by a consideration of what is being projected into the analyst.

  2. Synchronous computer mediated group discussion.

    PubMed

    Gallagher, Peter

    2005-01-01

    Over the past 20 years, focus groups have become increasingly popular with nursing researchers as a data collection method, as has the use of computer-based technologies to support all forms of nursing research. This article describes the conduct of a series of focus groups in which the participants were in the same room as part of a "real-time" discussion during which they also used personal computers as an interface between each other and the moderator. Synchronous Computer Mediated Group Discussion differed from other forms of focus group discussion in that participants used personal computers rather than verbal expressions to respond to specific questions, engage in communication with other participants, and to record their thoughts. This form of focus group maintained many of the features of spoken exchanges, a cornerstone of the focus group, while capturing the advantages of online discussion.

  3. Animating Geometry Discussions with Flexigons.

    ERIC Educational Resources Information Center

    McClintock, Ruth

    1994-01-01

    Presents activities with 10- and 4-straw flexigons, an object created by stringing together lengths of plastic drinking straws with nylon fishing line. Discusses several geometric theorems that can be demonstrated with flexigons. (MKR)

  4. LGBT Roundtable Discussion: Meet-up and Mentoring Discussion

    NASA Astrophysics Data System (ADS)

    2014-03-01

    The LGBT+ Physicists group welcomes those who identify as gender sexual minorities, as LGBTQQIAAP+, or as allies to participate in a round-table discussion on mentoring physicists. The session will provide an opportunity to learn and discuss successful mentoring strategies at different career stages for physicists in all environments, including academia, industry, etc. Attendees are encouraged to attend a social event to follow the panel to continue to network. Allies are especially welcome at this event to learn how to support and mentor LGBT+ physicists.

  5. Conséquences des nouvelles formes de commande sur les matériaux de l'isolation statorique

    NASA Astrophysics Data System (ADS)

    Bellomo, J. P.; Lebey, Th.; Peltier, Fr.; Oraison, J. M.

    1997-05-01

    Use of inverter drive for rotating machines speed control leads to the application of new stress on stator insulation materials. The integrity of these materials under such stresses has therefore to be studied. Thanks to specially equipped motor, the different voltage shapes have been identified. Very short rise time fronts, large overvoltages and high oscillation frequencies are obtained. These voltages are then reproduced on laboratory samples (Polyethylene Terephtalate). The main result is the existence of trapped surface charges related both to the rise front value and to the existence of polar mechanisms in the material bulk. The consequences of this surface charge existence on the reliability of a real system are then discussed. L'utilisation de nouvelles formes de commande pour les machines à courant alternatif se traduit par l'apparition d'un nouveau type de contraintes sur les matériaux de l'isolation statorique. L'étude de leur comportement sous l'action de ce type de contraintes revêt un intérêt tout particulier pour la validation et la stabilité de ces systèmes dans le temps. Nous présentons, tout d'abord, ces différentes formes de tension identifiées à l'aide d'un moteur spécialement instrumenté. L'existence de fronts de tension très élevés, de surtensions importantes (jusqu'à 500V) et d'oscillations hautes fréquences (2MHz), est mise en évidence. La reproduction de ces contraintes en laboratoire sur des échantillons de polyesters (PolyÉthylène Térephthalate) permet alors de déterminer l'influence des formes de tension carrées sur les propriétés intrinsèques du matériau. Elle se traduit par l'existence d'une charge piégée en surface du diélectrique. Cette charge superficielle est associée, d'une part à l'existence de phénomènes de relaxation dans les matériaux étudiés et d'autre part à la valeur des fronts de tension appliqués. Pour finir, les conséquences possibles de l'existence de ces charges superficielles

  6. Probabilistic inversion: a preliminary discussion

    NASA Astrophysics Data System (ADS)

    Battista Rossi, Giovanni; Crenna, Francesco

    2015-02-01

    We continue the discussion on the possibility of interpreting probability as a logic, that we have started in the previous IMEKO TC1-TC7-TC13 Symposium. We show here how a probabilistic logic can be extended up to including direct and inverse functions. We also discuss the relationship between this framework and the Bayes-Laplace rule, showing how the latter can be formally interpreted as a probabilistic inversion device. We suggest that these findings open a new perspective in the evaluation of measurement uncertainty.

  7. Five Discussions on Postsecondary Education.

    ERIC Educational Resources Information Center

    Jobe, E. R., Ed.

    Topics discussed are: (1) student aid and access to postsecondary education (Jack L. Woodward); (2) values in athletics (Grant Dungee); (3) some considerations in planning for postsecondary education (Paul G. Orr); (4) the open university as a challenge for postsecondary education in Mississippi (Cleopatra D. Thompson); and (5) comprehensive…

  8. What Is Effectiveness? Panel Discussion.

    ERIC Educational Resources Information Center

    Zigmond, Naomi

    Two papers are presented from a panel discussion moderated by Naomi Zigmond, who introduces the papers with a note on definitions and measures of intervention effectiveness. "Some Thoughts on Effective Intervention for Handicapped Preschoolers," by Phillip Strain, notes that special education researchers attempt to be efficient, economical,…

  9. Linguistic Indexicality in Algebra Discussions

    ERIC Educational Resources Information Center

    Staats, Susan; Batteen, Chris

    2010-01-01

    In discussion-oriented classrooms, students create mathematical ideas through conversations that reflect growing collective knowledge. Linguistic forms known as indexicals assist in the analysis of this collective, negotiated understanding. Indexical words and phrases create meaning through reference to the physical, verbal and ideational context.…

  10. Enhancing Discussion through Short Stories.

    ERIC Educational Resources Information Center

    Marcus, Sybil

    A teacher of English in a college-level intensive English language program describes a method for stimulating speech in high-intermediate and advanced students, using short stories. It is argued that in short stories, the themes are universal, and even shy students are willing to discuss this form of literature in class. Criteria for selecting…

  11. Body Art: A Panel Discussion.

    ERIC Educational Resources Information Center

    Surgenor, Peter; And Others

    1997-01-01

    Three camp directors discuss their policies regarding body art and body piercing. Only one director reported a strict policy prohibiting tattoos or body art based on standards that the camp portrays to families. However, all directors enforced policies prohibiting clothing or body art that mentions alcohol, tobacco, drug use, or inappropriate…

  12. Lively Discussions! Fostering Engaged Reading.

    ERIC Educational Resources Information Center

    Gambrell, Linda B., Ed.; Almasi, Janice F., Ed.

    Offering practical, classroom-based strategies teachers can use to promote literacy development, this book presents many examples of children engaging in discussion activities about narrative and informational text that emphasize collaborating, constructing meaning, and using these different types of texts to arrive at new understandings. Chapters…

  13. Another Discussion about Academic Corruption

    ERIC Educational Resources Information Center

    Changgeng, Li

    2007-01-01

    Academic corruption is a commonplace matter about which all people are clearly aware. However, people often overlook many hidden or latent manifestations of academic corruption. This article discusses eight of these manifestations: indiscriminate use of the academic team spirit, the proliferation of "word games," deliberate attacks on…

  14. Group discussion improves lie detection

    PubMed Central

    Klein, Nadav; Epley, Nicholas

    2015-01-01

    Groups of individuals can sometimes make more accurate judgments than the average individual could make alone. We tested whether this group advantage extends to lie detection, an exceptionally challenging judgment with accuracy rates rarely exceeding chance. In four experiments, we find that groups are consistently more accurate than individuals in distinguishing truths from lies, an effect that comes primarily from an increased ability to correctly identify when a person is lying. These experiments demonstrate that the group advantage in lie detection comes through the process of group discussion, and is not a product of aggregating individual opinions (a “wisdom-of-crowds” effect) or of altering response biases (such as reducing the “truth bias”). Interventions to improve lie detection typically focus on improving individual judgment, a costly and generally ineffective endeavor. Our findings suggest a cheap and simple synergistic approach of enabling group discussion before rendering a judgment. PMID:26015581

  15. Discussions on Hypnosis and Schizophrenia.

    PubMed

    Haley, Jay

    2015-01-01

    A classic paper in intellect and argument, this article contains a transcript of a conversation between Jay Haley, John Weakland, and Milton Erickson as they discuss the role of communication in hypnosis and schizophrenia. In 1955, schizophrenia was considered primarily a psychological disorder. Whereas today schizophrenia is mostly considered a biological disorder, this very early, unpublished paper still gives much food for thought and a further glimpse into Haley and Erickson's thinking and intellect at a fervent time in schizophrenia research.

  16. Influence du traitement thermique sur l'usinabilite du laiton monophase

    NASA Astrophysics Data System (ADS)

    Cholley, Airy

    La connaissance des proprietes et du comportement d'un materiau en usinage est primordiale pour optimiser son utilisation et obtenir une usinabilite maximale. Dans ce but, l'etude de la modification de la ductilite par traitement thermiques sur plusieurs criteres d'usinabilite tels que les efforts de coupe, la rugosite, les bavures et la formation du copeau a ete menee sur le laiton monophase. A cette fin, l'influence du traitement thermique sur la microstructure du laiton a d'abord ete etudiee. La taille des grains et la durete ont permis de determiner les proprietes mecaniques des etats metallurgiques. Des essais de percage ont ensuite ete effectues sur les etats metallurgiques H01 (99HV), OS100 (88HV) et OS250 (47HV) pour regarder l'influence du traitement thermique sur l'usinabilite. Cette etude experimentale a permis de comprendre l'influence du taux de laminage et de la temperature de recuit sur les proprietes mecaniques. Les essais d'usinabilite ont ensuite permis de prouver que les efforts de coupe sont dependants des conditions de coupe mais pas de la ductilite dans les etats metallurgiques testes. La taille des bavures augmente avec la ductilite et la vitesse de coupe, et diminue avec l'avance. La rugosite de la surface des trous apres l'usinage a egalement ete etudiee. Il a aussi ete prouve par une etude sur les copeaux que la temperature croit avec la vitesse de coupe. L'analyse de la segmentation des copeaux n'a en revanche pas permis de trouver une correlation significative avec les traitements thermiques testes. Enfin, le revetement de l'outil a montre une grande importance sur l'usinabilite du materiau. Il a ete conclu que l'usinabilite du laiton C26000 (CuZn30) est meilleure lorsqu'on travaille dans un etat metallurgique dur. Ces conclusions sont valables pour le laiton monophase etudie, il serait interessant d'examiner aussi le cas des laitons biphases.

  17. Axelrod model: accepting or discussing

    NASA Astrophysics Data System (ADS)

    Dybiec, Bartlomiej; Mitarai, Namiko; Sneppen, Kim

    2012-10-01

    Agents building social systems are characterized by complex states, and interactions among individuals can align their opinions. The Axelrod model describes how local interactions can result in emergence of cultural domains. We propose two variants of the Axelrod model where local consensus is reached either by listening and accepting one of neighbors' opinion or two agents discuss their opinion and achieve an agreement with mixed opinions. We show that the local agreement rule affects the character of the transition between the single culture and the multiculture regimes.

  18. Identifying tsunami deposits using shell taphonomy: Sur lagoon, Oman

    NASA Astrophysics Data System (ADS)

    Donato, S.; Reinhardt, E.; Rothaus, R.; Boyce, J.

    2007-05-01

    On November 28th, 1945 an 8.1 magnitude earthquake focused in the eastern portion of the Makran subduction zone (Arabian Sea) generated a powerful tsunami that destroyed many coastal villages in Pakistan and India. Reports indicate that the tsunami also caused significant damage in Muscat, Oman, although its effects elsewhere in Oman are unknown. A thick bivalve dominated shell horizon was discovered inside the Sur lagoon, which is located on the eastern promontory of Oman (200 km south of Muscat). This shell deposit is significant because it is laterally extensive (> 1 km2), extends deep within the lagoon (>2 km), ranges in thickness from 5 - 25 cm at the sample localities, contains numerous subtidal and offshore bivalve species, and articulated subtidal and offshore bivalve species are abundant. Although there is an absence of typical tsunami indicators such as allochthonous sediment in and around the lagoon, verbal accounts, cultural evidence recovered during coring, and the absence of strong storms during the past 100 years indicates that this shell unit was caused by the 1945 tsunami. In this setting, it would be advantageous to have another proxy for tsunami detection and risk prediction. The use of shell taphonomy is one of the potential indicators and here we present new evidence of its utility. We sampled this unit in eight locations, and compared the shell taphonomy to surface shell samples collected from beach and reworked horizons in the lagoon, and to shell samples from a known tsunami and corresponding storm/ballast deposit in Israel (Reinhardt et al., 2006). Taphonomic analysis yielded promising results, as the two tsunami horizons shared excellent agreement between the amount of fragmented shells, and the percentage of shells displaying angular breaks. Both of these categories were significantly different from the percentage of fragments and angular fragments recovered from the reworked, beach, and storm/ballast deposits, indicating different

  19. Aircraft Operations on Repaired Runways (l’Exploitation des Aeronefs sur les Pistes Refaites)

    DTIC Science & Technology

    1990-08-01

    procedures d’cxploitaiion des acronels sur des pistes repar&s. le Panel AGiARI) des Structures ct Materiaux at organisii des reunions pour faire Ic...existing 4.6 Resistance des avions. AIR 2(4E L - length of obstacle H - height/depth of obstacle Single obstacle Repeated obstacles (STOL aircraft

  20. Seafloor Rocks and Sediments of the Continental Shelf From Monterey Bay to Point Sur, California

    USGS Publications Warehouse

    Eittreim, Stephen L.; Anima, Roberto J.; Stevenson, Andrew J.; Wong, Florence L.

    2000-01-01

    Introduction Acoustic swath mapping of the greater Monterey Bay area continental shelf from Point Ano Nuevo to Point Sur reveals complex patterns of rock outcrops on the shelf, and coarse sand bodies that occur in distinct depressions on the inner and mid-shelves. This publication portrays the seafloor components in a 36- by 48-inch map sheet at 1:100,000 scale.

  1. Reflections on "Petit Battement sur le Cou de Pied": Is It Still Relevant?

    ERIC Educational Resources Information Center

    Paskevska, Anna

    2007-01-01

    This article presents multiple perspectives of "petit battement sur le cou de pied". These perspectives include historical, biomechanical, and pedagogic points of view. The article offers useful information for ballet specialists and applied research studies aimed at ballet pedagogy. (Contains 2 tables and 5 figures.)

  2. The Classroom as Big Sur: Notes on the Liaison Between Evaluation and Professional Growth

    ERIC Educational Resources Information Center

    Sneeden, Ralph

    2013-01-01

    Bill Frisell's new album ("Big Sur") was heralded with a short documentary about its impulse and inception: Frisell's retreat to an isolated coastal ranch in Central California. In the video, he describes the influence of the place, the dramatic and evocative landscape, and how it ultimately became the subject and theme for the…

  3. To discuss illicit nuclear trafficking

    SciTech Connect

    Balatsky, Galya I; Severe, William R; Wallace, Richard K

    2010-01-01

    The Illicit nuclear trafficking panel was conducted at the 4th Annual INMM workshop on Reducing the Risk from Radioactive and Nuclear Materials on February 2-3, 2010 in Washington DC. While the workshop occurred prior to the Nuclear Security Summit, April 12-13 2010 in Washington DC, some of the summit issues were raised during the workshop. The Communique of the Washington Nuclear Security Summit stated that 'Nuclear terrorism is one of the most challenging threats to international security, and strong nuclear security measures are the most effective means to prevent terrorists, criminals, or other unauthorized actors from acquiring nuclear materials.' The Illicit Trafficking panel is one means to strengthen nuclear security and cooperation at bilateral, regional and multilateral levels. Such a panel promotes nuclear security culture through technology development, human resources development, education and training. It is a tool which stresses the importance of international cooperation and coordination of assistance to improve efforts to prevent and respond to incidents of illicit nuclear trafficking. Illicit trafficking panel included representatives from US government, an international organization (IAEA), private industry and a non-governmental organization to discuss illicit nuclear trafficking issues. The focus of discussions was on best practices and challenges for addressing illicit nuclear trafficking. Terrorism connection. Workshop discussions pointed out the identification of terrorist connections with several trafficking incidents. Several trafficking cases involved real buyers (as opposed to undercover law enforcement agents) and there have been reports identifying individuals associated with terrorist organizations as prospective plutonium buyers. Some specific groups have been identified that consistently search for materials to buy on the black market, but no criminal groups were identified that specialize in nuclear materials or isotope smuggling

  4. Discussion on selected symbiotic stars

    NASA Technical Reports Server (NTRS)

    Viotti, Roberto; Hack, Margherita

    1993-01-01

    Because of its large variety of aspects, the symbiotic phenomenon is not very suitable for a statistical treatment. It is also not clear whether symbiotic stars really represent a homogeneous group of astrophysical objects or a collection of objects of different natures but showing similar phenomena. However we are especially interested in the symbiotic phenomenon, i.e., in those physical processes occurring in the atmosphere of each individual object and in their time dependence. Such a research can be performed through the detailed analysis of individual objects. This study should be done for a time long enough to cover all the different phases of their activity, in all the spectral ranges. Since the typical time scale of the symbiotic phenomena is up to several years and decades, this represents a problem since, for instance, making astronomy outside the visual region is a quite new field of research. It was a fortunate case that a few symbiotic stars (Z And, AG Dra, CH Cyg, AX Per, and PU Vul) had undergone remarkable light variations (or 'outbursts') in recent years, which could have been followed in the space ultraviolet with IUE, and simultaneously in the optical and IR with ground-based telescopes. But, in general, the time coverage of most of the symbiotic objects is too short to have a complete picture of their behavior. In this regard, one should recall Mayall's remark about the light curve of Z And: 'Z Andromedae is another variable that shows it will require several hundred years of observations before a good analysis can be made of its variations'. This pessimistic remark should be considered as a note of caution for those involved in the interpretation of the observations. We shall discuss a number of individual symbiotic stars for which the amount of observational data is large enough to draw a rather complete picture of their general behavior and to make consistent models. We shall especially illustrate the necessary steps toward an empirical model

  5. Eisosomes promote the ability of Sur7 to regulate plasma membrane organization in Candida albicans

    PubMed Central

    Wang, Hong X.; Douglas, Lois M.; Veselá, Petra; Rachel, Reinhard; Malinsky, Jan; Konopka, James B.

    2016-01-01

    The plasma membrane of the fungal pathogen Candida albicans forms a protective barrier that also mediates many processes needed for virulence, including cell wall synthesis, invasive hyphal morphogenesis, and nutrient uptake. Because compartmentalization of the plasma membrane is believed to coordinate these diverse activities, we examined plasma membrane microdomains termed eisosomes or membrane compartment of Can1 (MCC), which correspond to ∼200-nm-long furrows in the plasma membrane. A pil1∆ lsp1∆ mutant failed to form eisosomes and displayed strong defects in plasma membrane organization and morphogenesis, including extensive cell wall invaginations. Mutation of eisosome proteins Slm2, Pkh2, and Pkh3 did not cause similar cell wall defects, although pkh2∆ cells formed chains of furrows and pkh3∆ cells formed wider furrows, identifying novel roles for the Pkh protein kinases in regulating furrows. In contrast, the sur7∆ mutant formed cell wall invaginations similar to those for the pil1∆ lsp1∆ mutant even though it could form eisosomes and furrows. A PH-domain probe revealed that the regulatory lipid phosphatidylinositol 4,5-bisphosphate was enriched at sites of cell wall invaginations in both the sur7∆ and pil1∆ lsp1∆ cells, indicating that this contributes to the defects. The sur7∆ and pil1∆ lsp1∆ mutants displayed differential susceptibility to various types of stress, indicating that they affect overlapping but distinct functions. In support of this, many mutant phenotypes of the pil1∆ lsp1∆ cells were rescued by overexpressing SUR7. These results demonstrate that C. albicans eisosomes promote the ability of Sur7 to regulate plasma membrane organization. PMID:27009204

  6. Intramolecular interaction of SUR2 subtypes for intracellular ADP-Induced differential control of K(ATP) channels.

    PubMed

    Matsushita, Kenji; Kinoshita, Kengo; Matsuoka, Tetsuro; Fujita, Akikazu; Fujikado, Takashi; Tano, Yasuo; Nakamura, Haruki; Kurachi, Yoshihisa

    2002-03-22

    ATP-sensitive K+ (K(ATP)) channels are composed of sulfonylurea receptors (SURs) and inwardly rectifying Kir6.2-channels. The C-terminal 42 amino acid residues (C42) of SURs are responsible for ADP-induced differential activation of K(ATP) channels in SUR-subtypes. By examining ADP-effect on K(ATP) channels containing various chimeras of SUR2A and SUR2B, we identified a segment of 7 residues at central portion of C42 critical for this phenomenon. A 3-D structure model of the region containing the second nucleotide-binding domain (NBD2) of SUR and C42 was developed based on the structure of HisP, a nucleotide-binding protein forming the bacterial Histidine transporter complex. In the model, the polar and charged residues in the critical segment located within a distance that allows their electrostatic interaction with Arg1344 at the Walker-A loop of NBD2. Therefore, the interaction might be involved in the control of ADP-induced differential activation of SUR2-subtype K(ATP) channels.

  7. Que nous apprennent les petits frères et sœurs sur les signes précoces d’autisme?1

    PubMed Central

    Rogers, Sally J.

    2010-01-01

    L’objectif de cette revue est de présenter une synthèse des réponses que l’on peut actuellement apporter à la question de savoir quelles sont les premières caractéristiques comportementales qui prédisent le développement de l’autisme. L’article se centre sur 5 points : la présence de Troubles du Spectre Autistique (TSA) dans des groupes de frères et sœurs puînés d’enfants déjà diagnostiqués, les patterns et caractéristiques du développement moteur, les patterns et caractéristiques du développement social et émotionnel, les patterns et caractéristiques de la communication intentionnelle verbale et non verbale, et les patterns qui marquent le début de comportements pathognomoniques de TSA. La discussion porte sur les aspects inattendus des résultats et les pistes de recherche nouvelles qu’ils peuvent engendrer. PMID:20890377

  8. Signes sur des pistes pedagogiques (Signs on Pedagogical Trails)

    ERIC Educational Resources Information Center

    Porcher, Louis

    1978-01-01

    An overview of the topics in this issue. The place of authentic documents; their use in promoting communicative competence; new uses of visuals, such as cartoons; visuals for evaluation purposes; their cultural value; and the development of video-cassettes are discussed. (Text is in French.) (AMH)

  9. Questions sur les objectifs (Questions on the Objectives)

    ERIC Educational Resources Information Center

    Porcher, Louis

    1975-01-01

    This article discusses instruction by objectives. Suggestions include relating objectives to the notion of evaluation, so that improvement in objectives implies change in examinations; making the objectives clear to the learner; and taking into account the changing needs of the learner at each stage of learning. (Text is in French.) (AM)

  10. The Palaeodiet of the Pericue Indians of the Cape Region of Baja California Sur, Mexico.

    NASA Astrophysics Data System (ADS)

    Beer, N.; Gonzalez, S.; Huddart, D.; Rosales-Lopez, A.; Lamb, A.

    2008-05-01

    The archaeology of the Pericue Indians inhabiting the Cape region of Baja California has long been an area of interest. The dolichocranic traits exhibited by this population have lead to suggestions that these people were a relic population of an early coastal migration into North America. The antiquity of directly dated Pericue human remains only reaches 3,000 B.P. with occupation sites dating back to 9,000 B.P. The site of Babisuri cave in Isla Espiritu Santo may demonstrate a very early human presence in Baja California Sur between 36,000 to 45,000 B.P. although the exact nature of this evidence is unclear. Increasing tourist development within this region threatens many archaeological sites particularly coastal shell middens and rock shelters. Current rescue excavations are yielding important information regarding many aspects of the culture of the Pericue Indians. Geochemical evidence of diet {d13C and d15N} taken from Pericue bone samples, modern and archaeological animals and modern plants is helping us to understand the complicated subsistence strategies of this group. Initial results highlight a complicated and diverse diet including marine and terrestrial resources, most likely exploited seasonally. Similarities between the diet of the Pericue and other nearby coastal Indian groups are clear and will be discussed. Pericue Indian material culture, combined with the exploitation of marine mammals and the construction of enormous shell mounds display parallels with other central and North American groups. The exploitation of marine mammals and the associated stone tools display striking similarities to the Chumash people of the Channel Islands of Coastal Southern California. Some of these cultural similarities will be highlighted in this presentation. Current genetic work is attempting to discover the nature of the similarities between the Chumash and Pericue groups as some cultural elements of each group have parallels with the other. Initial genetic

  11. Évolution des lignes directrices sur le traitement de la dyslipidémie

    PubMed Central

    John Bosomworth, N.

    2014-01-01

    Résumé Objectif Comprendre comment les nouvelles lignes directrices sur la prise en charge du risque cardiovasculaire publiées par l’American Heart Association et l’American College of Cardiology (AHA-ACC) peuvent être interprétées et utilisées dans le contexte canadien. Sources des données Les lignes directrices de l’AHA-ACC ont été examinées, de même que toutes les références. Des recherches indépendantes dans PubMed ont été effectuées pour inclure l’ajout aux statines d’autres antihyperlipidémiants et l’emploi de calculatrices médicales visant à aider le patient à comprendre. Message principal Les nouvelles lignes directrices de l’AHA-ACC s’appuient sur les meilleures données probantes disponibles actuellement en matière de traitement de la dyslipidémie. Cela inclut le risque cardiovasculaire (CV) sur 10 ans comme seuil thérapeutique au lieu du taux de cholestérol des lipoprotéines de faible densité, de même que l’abandon des cibles thérapeutiques de lipoprotéines de faible densité. On met de plus en plus l’accent sur les interventions alimentaires et l’exercice, avec l’amorce d’un effort pour quantifier l’effet de ces interventions. Les statines constituent la principale intervention pharmacologique, et l’ajout d’autres médicaments pour accentuer la baisse lipidique n’est plus recommandé. En ce qui concerne l’application au Canada, les tables de risque de Framingham sont plus appropriées pour évaluer le risque que les équations de cohortes regroupées utilisées aux États-Unis. Les calculatrices du risque de maladie cardiovasculaire (MCV) devraient contenir de l’information sur l’âge cardiovasculaire et devraient pouvoir illustrer le risque et les interventions de rechange afin d’aider le patient à comprendre et de favoriser la prise de décision éclairée. Conclusion L’attention sur les meilleures données probantes concernant le risque CV peut simplifier le traitement de la

  12. [SENTIERI Project: discussion and conclusions].

    PubMed

    Pirastu, Roberta; Ricci, Paolo; Comba, Pietro; Bianchi, Fabrizio; Biggeri, Annibale; Conti, Susanna; Fazzo, Lucia; Forastiere, Francesco; Iavarone, Ivano; Martuzzi, Marco; Musmeci, Loredana; Pasetto, Roberto; Zona, Amerigo; Crocetti, Emanuele

    2014-01-01

    showing the increase, considering latency and the length of the observation period. Of further interest are results relating to diseases of the urinary tract such as kidney failure in the NPCSs of Basso bacino del fiume Chienti, Taranto, Milazzo and Priolo. Overall, the results discussed above are consistent with the previous findings pertaining to mortality for 1995-2002. The present analysis also introduces a new element - the study of cancer incidence and hospital discharges - which can tell us a great deal about diseases with high survival rates or non lethal ones. The first is the case of thyroid cancer, which presents increases in both databases and for both genders in a number of NPCSs (Brescia-Caffaro, Laghi di Mantova, Milazzo, Sassuolo- Scandiano and Taranto). The study of cancer incidence and hospital discharges also revealed cancer excesses for melanoma, breast cancer and non Hodgkin lymphoma in Brescia-Caffaro NPCS where PCBs (Polychlorinated biphenyl) are the site's main pollutant. PCBs, according to the 2013 evaluation of the International Agency for Research on Cancer, are ascertained human carcinogens for melanoma and probable carcinogens for breast cancer and non-Hodgkin lymphoma. The results pertaining to cancer incidence in the 17 NPCSs can also be presented using rankings by area or disease analyzed by a multivariate hierarchical Bayesian model. These rankings reveal an overlapping of credibility intervals, such that it is not possible to speak of a limited number of cancer sites or of certain NPCSs as being particularly affected. Every NPCS, therefore, must be considered individually and ordering them by ranking of cancer incidence wouldn't be appropriate. Data collected concerning some of the NPCSs in the context of the SENTIERI Project is so conclusive that remediation measures can immediately be put in place. This is the case in the Biancavilla and Brescia-Caffaro NPCSs. A similar conclusion can be drawn for complex locations such as Taranto

  13. Survey of Hyperspectral and Multispectral Imaging Technologies (Etude sur les technologies d’imagerie hyperspectrale et multispectrale)

    DTIC Science & Technology

    2007-05-01

    SET-065-P3 Survey of Hyperspectral and Multispectral Imaging Technologies ( Etude sur les technologies d’imagerie hyperspectrale et multispectrale... Etude sur les technologies d’imagerie hyperspectrale et multispectrale) This Report forms part of RTG-33’s activities in assessing...that will guarantee a solid base for the future. The content of this publication has been reproduced directly from material supplied by RTO or the

  14. Réalisation de réseaux sur polymères par laser UV

    NASA Astrophysics Data System (ADS)

    Castex, M. C.; Fischer, A.; Simeonov, D.; Adès, D.; Siove, A.

    2003-06-01

    Nous présentons ici une méthode très simple de réalisation de réseaux d'amplitude de pas sub-micronique sur des films polymères à base de carbazote déposés sur des substrat de silice. Les réseaux sont fabriqués en irradiant avec un faisceau laser à 193nm un masque de phase placé au contact du film. La qualité des réseaux obtenus permet désormais d'envisager la réalisation de micro-cavités lasers de type planaire permettant de sélectionner une émission laser monomode autour de 400nm.

  15. Influence des inclusions sur la rupture d'un acier faiblement allié

    NASA Astrophysics Data System (ADS)

    Hausild, P.; Berdin, C.; Bompard, P.; Prioul, C.

    2003-03-01

    L'étude de la rupture d'un acier faiblement allié dans le domaine de la transition ductile fragile a permis de mettre en évidence la présence croissante, avec la température de sollicitation, d'amas d'inclusions de seconde phase sur les surfaces de rupture. On montre, à l'aide de modélisations par éléments finis, que ces amas jouent néanmoins un rôle mineur dans le déclenchement du clivage. En revanche, leur influence sur la propagation de la rupture ductile est importante. On peut alors expliquer l'anisotropie de la résilience en prenant en compte la géométrie des inclusions et leur répartition spatiale.

  16. The Nucleotide-Binding Sites of SUR1: A Mechanistic Model

    PubMed Central

    Vedovato, Natascia; Ashcroft, Frances M.; Puljung, Michael C.

    2015-01-01

    ATP-sensitive potassium (KATP) channels comprise four pore-forming Kir6.2 subunits and four modulatory sulfonylurea receptor (SUR) subunits. The latter belong to the ATP-binding cassette family of transporters. KATP channels are inhibited by ATP (or ADP) binding to Kir6.2 and activated by Mg-nucleotide interactions with SUR. This dual regulation enables the KATP channel to couple the metabolic state of a cell to its electrical excitability and is crucial for the KATP channel’s role in regulating insulin secretion, cardiac and neuronal excitability, and vascular tone. Here, we review the regulation of the KATP channel by adenine nucleotides and present an equilibrium allosteric model for nucleotide activation and inhibition. The model can account for many experimental observations in the literature and provides testable predictions for future experiments. PMID:26682803

  17. Characterization of surface antigen protein 1 (SurA1) from Acinetobacter baumannii and its role in virulence and fitness.

    PubMed

    Liu, Dong; Liu, Zeng-Shan; Hu, Pan; Cai, Ling; Fu, Bao-Quan; Li, Yan-Song; Lu, Shi-Ying; Liu, Nan-Nan; Ma, Xiao-Long; Chi, Dan; Chang, Jiang; Shui, Yi-Ming; Li, Zhao-Hui; Ahmad, Waqas; Zhou, Yu; Ren, Hong-Lin

    2016-04-15

    Acinetobacter baumannii is a Gram-negative bacillus that causes nosocomial infections, such as bacteremia, pneumonia, and meningitis and urinary tract and wound infections. In the present study, the surface antigen protein 1 (SurA1) gene of A. baumannii strain CCGGD201101 was identified, cloned and expressed, and then its roles in fitness and virulence were investigated. Virulence was observed in the human lung cancer cell lines A549 and HEp-2 at one week after treatment with recombinant SurA1. One isogenic SurA1 knock-out strain, GR0015, which was derived from the A. baumannii strain CCGGD201101 isolated from diseased chicks in a previous study, highlighted the effect of SurA1 on fitness and growth. Its growth rate in LB broth and killing activity in human sera were significantly decreased compared with strain CCGGD201101. In the Galleria mellonella insect model, the isogenic SurA1 knock-out strain exhibited a lower survival rate and decreased dissemination. These results suggest that SurA1 plays an important role in the fitness and virulence of A. baumannii.

  18. The Sur7 Protein Regulates Plasma Membrane Organization and Prevents Intracellular Cell Wall Growth in Candida albicans

    PubMed Central

    Alvarez, Francisco J.; Douglas, Lois M.; Rosebrock, Adam

    2008-01-01

    The Candida albicans plasma membrane plays important roles in cell growth and as a target for antifungal drugs. Analysis of Ca-Sur7 showed that this four transmembrane domain protein localized to stable punctate patches, similar to the plasma membrane subdomains known as eisosomes or MCC that were discovered in S. cerevisiae. The localization of Ca-Sur7 depended on sphingolipid synthesis. In contrast to S. cerevisiae, a C. albicans sur7Δ mutant displayed defects in endocytosis and morphogenesis. Septins and actin were mislocalized, and cell wall synthesis was very abnormal, including long projections of cell wall into the cytoplasm. Several phenotypes of the sur7Δ mutant are similar to the effects of inhibiting β-glucan synthase, suggesting that the abnormal cell wall synthesis is related to activation of chitin synthase activity seen under stress conditions. These results expand the roles of eisosomes by demonstrating that Sur7 is needed for proper plasma membrane organization and cell wall synthesis. A conserved Cys motif in the first extracellular loop of fungal Sur7 proteins is similar to a characteristic motif of the claudin proteins that form tight junctions in animal cells, suggesting a common role for these tetraspanning membrane proteins in forming specialized plasma membrane domains. PMID:18799621

  19. The Bacillus stearothermophilus NUB36 surA gene encodes a thermophilic sucrase related to Bacillus subtilis SacA.

    PubMed

    Li, Y; Ferenci, T

    1996-07-01

    The complete nucleotide sequence of the surA gene, encoding a sucrase from Bacillus stearothermophilus NUB36, was determined. surA was composed of 1338 bp and encoded 445 amino acid residues. The deduced polypeptide of M(r) 51519 showed strong sequence similarity to sucrose and sucrose phosphate hydrolases from Bacillus subtilis, Klebsiella pneumoniae and Vibrio alginolyticus, and contained the 'sucrose box' residues thought to be important for catalysis of the transfer of fructose from sucrose. The enzyme was partially purified using affinity chromotography from extracts of Escherichia coli containing the cloned surA. SurA displayed an optimum temperature for sucrose hydrolysis of 55 degrees C and high stability. The M(r) of SurA determined by gel filtration was 105,000, which suggested that the active form of the enzyme is a dimer. SurA exhibited an apparent Km of 40 mM for sucrose but, unlike the homologous B. subtilis enzyme, had no detectable sucrose phosphate hydrolase activity.

  20. [Polyplacophoran communities (Mollusca: Polyplacophora) at Bahia de La Paz, Baja California Sur, México].

    PubMed

    García Ríos, Cedar I; Alvarez Ruiz, Migdalia

    2007-03-01

    Eight species of polyplacophorans have been reported from La Bahia de la Paz, Baja California Sur, Mexico. We add Lepidochitona beanii, Chaetopleura lurida, Stenoplax limaciformis, S. mariposa, Lepidozona clathrata, L. serrata and Acanthochitona arragonites, increasing the known number of species to 15. Ordination analysis of five chiton communities at the site suggests a correlation of wave exposure to species composition and diversity: communities with intermediate wave exposure have more species (richness) and higher diversity (Shannon's index).

  1. Carcinome papillaire sur kyste du tractus thyréoglosse: à propos de deux cas

    PubMed Central

    Dbab, Lamia; Nouri, Hassan; Iguelouane, Nassim; Rochdi, Youssef; Aderdour, Lahcen; Raji, Abdelaziz

    2015-01-01

    L'objectif de ce travail est de présenté deux cas de carcinomes papillaire sur kystes du tractus thyréoglosse (KTT) et d'exposer notre attitude thérapeutique. Il s'agit de deux patientes, une âgée de 30 ans et l'autre de 45 ans, qui ont été opéré dans notre centre. Le diagnostic du carcinome papillaire sur KTT a été retenu après étude anatomopathologique du kyste après exérèse selon la technique de Sistrunk. Une thyroïdectomie totale suivie d'une irathérapie et d'une hormonothérapie freinatrice a été réalisé chez l'une des patientes, pour l'autre une thyroïdectomie totale associée à une hormonothérapie freinatrice a été préconisé. L'évolution été favorable après un recule de 4 ans pour la première patiente et de 2 ans pour la deuxième. La thyroïdectomie totale après exérèse complète du KTT est le traitement recommandé pour le carcinome papillaire sur KTT. Il a été démontré qu'un cancer latent de la thyroïde peut être développé même après des années après l'exérèse du KTT. Le traitement du carcinome papillaire sur KTT est bien codifié, permettant un excellent pronostic. PMID:26848352

  2. Etude du stockage de l'hydrogene sur des nanostructures de carbone microporeuses

    NASA Astrophysics Data System (ADS)

    Poirier, Eric

    2007-12-01

    Le stockage de l'hydrogene par adsorption sur des adsorbants nano-structures a ete etudie sous differentes conditions de pression et de temperature. Les adsorbants etudies sont principalement des nanotubes de carbone a simple paroi ainsi que des structures metallo-organiques. Les mesures ont ete realisees a l'aide de systemes gravimetriques et volumetriques tres sensibles specialement mis au point pour de petits echantillons necessitant un degazage in situ. Les appareils developpes, au nombre de quatre, comprennent deux systemes gravimetriques et deux systemes volumetriques. Ensemble, ces systemes couvrent la plage de pressions (0-100) bars ainsi que la plage de temperatures (77-295) K. Les differentes analyses montrent que l'adsorption d'hydrogene sur les adsorbants nano-structures etudies est maximale a 77 K et varie entre environ (1.5 et 4) % masse. A temperature ambiante, l'adsorption croit lineairement avec la pression et demeure sous les 1% masse pour des pressions inferieures a 100 bars. L'adsorption d'hydrogene sur ces materiaux dans ces conditions se compare notamment a celle obtenue sur des charbons actives. La modelisation de l'adsorption a egalement ete realisee dans des conditions cryogeniques a l'aide du modele de Dubinin-Astakhov sous une forme adaptee pour l'adsorption supercritique. Les enthalpies d'adsorption calculees a partir de ce modele varient sous les 6 kJ/mole et sont donc consistantes avec des processus de physisorption. L'applicabilite du modele de Dubinin-Astakhov suggere que l'adsorption d'hydrogene puisse etre representee par un processus de remplissage des pores par un pseudo-liquide. Ces travaux s'inscrivent dans un contexte ou la capacite d'adsorption reelle des nanostructures de carbone est sujette a la controverse. En consequence, l'approche experimentale adoptee se distingue par les differentes demarches mises de l'avant pour l'obtention de mesures fiables sur des echantillons de faibles masses ainsi que par son caractere

  3. 2010 Coalition Battle Management Language Workshop (Atelier 2010 sur le langage de gestion du champ de bataille pour les operations en coalition)

    DTIC Science & Technology

    2010-02-01

    Feb 2010 2010 Coalition Battle Management Language Workshop (Atelier 2010 sur le langage de gestion du champ de bataille pour les opérations en...RTO MEETING PROCEEDINGS MP-MSG-079 2010 Coalition Battle Management Language Workshop (Atelier 2010 sur le langage de gestion du champ de...RTO-MP-MSG-079 ES - 3 Atelier 2010 sur le langage de gestion du champ de bataille pour les opérations en coalition (RTO-MP-MSG-079

  4. Change of Cerebral Oxygenation during Surfactant Treatment in Preterm Infants: "LISA" versus "InSurE" Procedures.

    PubMed

    Bertini, Giovanna; Coviello, Caterina; Gozzini, Elena; Bianconi, Tommaso; Bresci, Cecilia; Leonardi, Valentina; Dani, Carlo

    2017-04-01

    Objectives The aim of the study was to compare the effects on cerebral oxygenation in preterm infants of two different procedures for surfactant administration: the LISA (low-invasive method of surfactant administration) and the InSurE (Intubation, SURfactant administration, Extubation). Study Design Twenty premature infants with respiratory distress syndrome were assigned to receive surfactant either by "LISA" (n = 10) or "InSurE" (n = 10) procedure. Patients were continuously studied by near-infrared spectroscopy (NIRS) for the measurement of cerebral regional oxygenation (rSO2C) and calculation of cerebral fractional oxygen extraction rate (cFTOE), and NIRS data were recorded 30 minutes before (T0) surfactant administration, during the procedure (Tproc), and 30 (T1), 60 (T2T2), and 120 minutes (T3) afterward. Cerebral blood flow velocity (CBFV) was studied in the anterior cerebral artery at T0, T1, and T3. Results SpO2 significantly decreased at Tproc in comparison with T0, T1, T2, and T3 and the decrease was higher in the LISA than in the InSurE group. rSO2C was lower at tproc and T3 in the LISA than in the InSurE group. cFTOE was higher at tproc, t2, and t3 in the LISA group than in the InSurE group. CBFV did not change during the study periods in both groups. Conclusions The LISA and InSurE procedures transiently decreased rSO2C in our population, and the decrease was higher in the LISA group. Consistently, there was a contemporary increase in cFTOE that was higher in the LISA than in the InSurE group, suggesting that it represents a compensatory mechanism.

  5. Video 7 of 14: Classroom Discussion

    NASA Video Gallery

    This video segment documents the follow-up discussion, in which students discuss the results of their test flights. The session demonstrates how the teacher uses the inquiry method to evaluate stud...

  6. The Science of Drug Use: Discussion Points

    MedlinePlus

    ... of Drug Use: Discussion Points The Science of Drug Use: Discussion Points Email Facebook Twitter Revised February ... intended adult or teen. Why do people use drugs? People use drugs for many reasons: they want ...

  7. Discussing Diabetes with Your Healthcare Provider

    MedlinePlus

    ... of this page please turn Javascript on. Feature: Diabetes Discussing Diabetes with Your Healthcare Provider Past Issues / Fall 2009 Table of Contents Diabetes Medicines—Always Discuss Them with Your Healthcare Provider ...

  8. To Infuse New Thinking, Try Book Discussions.

    ERIC Educational Resources Information Center

    Smit, Gary M.

    2001-01-01

    Describes how one school superintendent started a book discussion group to provide his leadership team with an opportunity to read, review, and discuss books dealing with contemporary educational issues. Identifies some benefits for professional growth and organizational improvement. (PKP)

  9. Etude sur les tendons en materiaux composites et leur application aux ancrages postcontraints

    NASA Astrophysics Data System (ADS)

    Chennouf, Adil

    L'objectif general de la presente these est d'evaluer le comportement a l'arrachement et au fluage d'ancrages injectes constitues de tendons en materiaux composites afin d'etablir des recommandations plus appropriees et realistes pour le dimensionnement et la conception. Quatre types de tendons en materiaux composites, deux a base de fibres d'aramide et deux a base de fibres de carbone, ont ete utilises dans l'etude. Les travaux de recherche de cette these ont porte notamment sur: (I) Une caracterisation physique et mecanique des tendons en materiaux composites utilises dans l'etude. (II) Une etude en laboratoire sur les coulis de scellement. La premiere etape de cette etude a concerne le developpement d'un coulis de scellement performant adapte aux tendons en materiaux composites et a differentes situations d'injection. La seconde etape a traite des essais de caracterisations physique et mecanique du coulis de scellement developpe comparativement a trois coulis de scellement usuels d'un meme rapport E/L de 0,4. (III) Une etude sur des modeles reduits d'ancrages injectes. (IV) Une etude sur des modeles d'ancrages a grande echelle. La synthese de ces etudes a permis d'enoncer les principales conclusions suivantes: (1) Les valeurs moyennes des charges de rupture des tendons en materiaux composites ont ete de 1% a 29% superieures a celles specifiees par les manufacturiers. (2) L'etude sur les coulis de scellement a permis le developpement de coulis de ciment repondant aux criteres fixes, soient une grande stabilite, une bonne fluidite, une legere expansion et de bonnes caracteristiques mecaniques. (3) Les tendons en materiaux composites ont montre des contraintes d'adherence maximum superieures a celles des tendons en acier. (4) Le type de fibre, la configuration et le fini de surface des tendons en materiaux composites gouvernent leur resistance a l'adherence. (5) L'introduction de sable et d'autres ajouts comme les fines de silice et la poudre d'aluminium au coulis

  10. Leading Discussions: Opening up the Conversation

    ERIC Educational Resources Information Center

    Henning, John E.

    2005-01-01

    Leading a productive discussion, one that both engages students and enhances their understanding, may be the most complex and challenging task in teaching. This article explores three approaches to increasing the productivity of discussions. They include framing discussions in a way that allows students easier access to the topic, making the kind…

  11. Discussion Technique: The Twice-Around

    ERIC Educational Resources Information Center

    Andersen, Kent

    2013-01-01

    In this article, the author offers a discussion technique: the twice-around. A variant on the circular response discussion, the twice-around engages students by beginning with students' questions, ensuring equal time for all participants and inviting discussants to build on previous contributions. In the twice-around, participants sit in a circle,…

  12. Phenylephrine preconditioning in embryonic heart H9c2 cells is mediated by up-regulation of SUR2B/Kir6.2: A first evidence for functional role of SUR2B in sarcolemmal KATP channels and cardioprotection.

    PubMed

    Jovanović, Sofija; Ballantyne, Thomas; Du, Qingyou; Blagojević, Miloš; Jovanović, Aleksandar

    2016-01-01

    ATP-sensitive K(+) (KATP) channels were originally described in cardiomyocytes, where physiological levels of intracellular ATP keep them in a closed state. Structurally, these channels are composed of pore-forming inward rectifier, Kir6.1 or Kir6.2, and a regulatory, ATP-binding subunit, SUR1, SUR2A or SUR2B. SUR1 and Kir6.2 form pancreatic type of KATP channels, SUR2A and Kir6.2 form cardiac type of KATP channels, SUR2B and Kir6.1 form vascular smooth muscle type of KATP channels. The presence of SUR2B has been described in cardiomyocytes, but its functional significance and role has remained unknown. Pretreatment with phenylephrine (100nM) for 24h increased mRNA levels of SUR2B and Kir6.2, without affecting those levels of SUR1, SUR2A and Kir6.1 in embryonic heart H9c2 cells. Such increase was associated with increased K(+) current through KATP channels and Kir6.2/SUR2B protein complexes as revealed by whole cell patch clamp electrophysiology and immunoprecipitation/Western blotting respectively. Pretreatment with phenylephrine (100nM) generated a cellular phenotype that acquired resistance to chemical hypoxia induced by 2,4-dinitrophenol (DNP; 10mM), which was accompanied by increased in K(+) current in response to DNP (10mM). Cytoprotection afforded by phenylephrine (100nM) was abolished by infection of H9c2 cells with adenovirus containing Kir6.2AFA, a mutant form of Kir6.2 with largely reduced K(+) conductance. Taking all together, the present findings demonstrate that the activation of α1-adrenoceptors up-regulates SUR2B/Kir6.2 to confer cardioprotection. This is the first account of possible physiological role of SUR2B in cardiomyocytes.

  13. Sur la reponse en frequence du tissu nerveux dans le cortex

    NASA Astrophysics Data System (ADS)

    Bedard, Claude

    Dans cette These de Physique, nous avons etudie la dependance en frequence du champ electrique du tissu nerveux dans le cortex. Ce champ est aussi designe par "Local field Potential" LFP dans la litterature scientifique. Cette etude est fondee sur la theorie du champ electromagnetisme de Maxwell et sur de l'information tiree de la donne experimentale. Le resultat essentiel de cette These est que la grandeur enorme du temps de relaxation de Maxwell des membranes cellulaires semble etre la cause principale de la dependance en frequence des LFPs. Cette dependance en frequence causee par chaque membrane cellulaire est l'analogue d'un circuit RC ou la resistance R est la resistivite parallele d'une membrane cellulaire, et ou la capacite C est la permittivite electrique de la membrane. L'effet resultant d'un tres grand nombre de cellules donne un spectre de Fourier dont l'enveloppe est tres pres d'un signal en 1/f. Le modele physique propose dans cette These permet de lier les mesures prises a l'interieur d'une dendrite des variations de potentiel electrique a celles prises dans le liquide extracellulaire. De plus, cette These semble ouvrir la possibilite de mesurer le temps de relaxation de Maxwell des membranes cellulaires a l'aide de la mesure de la reponse en frequence du potentiel electrique extracellulaire (LFP). Enfin, cette These permet de lever le voile sur un sujet peu etudie, principalement en raison de la difficulte que represente l'etude des phenomenes electriques dans des milieux complexes comme les tissus vivants. En particulier, le probleme du filtrage frequentiel du potentiel electrique extracellulaire est une propriete fondamentale du tissu nerveux et son origine n'est pas connue.

  14. Instrumentation pour la spectroscopie laser sur faisceau d'ions rapides

    NASA Astrophysics Data System (ADS)

    Bazin, Marc

    Devant l'emergence des technologies exploitant l'infiniment petit, la spectroscopie atomique et moleculaire devient de plus en plus incontournable pour comprendre precisement les mecanismes quantiques impliques dans l'interaction des molecules. C'est le cas notamment de la nanotechnologie, de la dynamique reactionnelle des gaz a effet de serre ou simplement de l'identification des molecules constituant certains objets de l'astrophysique. Bien qu'un travail considerable soit deja accompli pour comprendre la dissociation ou la formation des molecules simples, il reste a vaincre la complexite des mecanismes impliques lorsque les molecules possedent plus de trois noyaux. Parmi les rares techniques de spectroscopie a tres haute resolution (jusqu'a la structure hyperfine), la spectroscopie laser sur faisceaux d'ions rapides est une methode experimentale eprouvee depuis trois decennies environ. Cette methode spectroscopique fournit des resultats comptant parmi les meilleurs pour obtenir des constantes moleculaires precises et permettre la reduction du spectre moleculaire. Une particularite remarquable de notre instrument est la possibilite d'enregistrer le signal de fragmentation moleculaire par laser via les etats de predissociation de la molecule etudiee. Notre contribution a ete d'ameliorer et de moderniser l'equipement existant. Nous avons augmente la resolution spectrale de notre instrument. Nous avons atteint notre principal objectif, a savoir, la possibilite d'acquerir des spectres selon deux modes : par detection du signal synchronisee sur le faisceau laser module en frequence ou par detection du signal directement par comptage. Cette derniere methode est une premiere sur ce type d'instrument et son principal interet a ete d'obtenir une meilleure mesure de l'elargissement de raie. Nous sommes parvenus a mettre clairement en evidence l'elargissement de raie avec la puissance laser en utilisant la methode de detection par comptage direct. La fluorescence induite par

  15. Fonction maximale centrée de Hardy-Littlewood sur les espaces hyperboliques

    NASA Astrophysics Data System (ADS)

    Li, Hong-Quan; Lohoué, Noël

    2012-10-01

    On montre que la fonction maximale centrée de Hardy-Littlewood, M, sur les espaces hyperboliques réels {H}n = {R}^{{{raise .17exhbox riptstyle +}{raise .17exhbox riptstyle +}{raise .1exhbox riptscriptstyle +}riptscriptstyle +}} × {R}^{n - 1}, satisfait l'inégalité de type faible \\| M f \\|_{L^{1, infty}} ≤ A (n log {n}) \\| f\\|1 pour toute f∈ L 1(ℍ n ), où A>0 est une constante indépendante de la dimension n.

  16. Grossesse sur cicatrice de césarienne: à propos d'un cas et revue de la literature

    PubMed Central

    Lachiri, Boutaina; Zazi, Abdelgheni; Benkerroum, Zineb; Hafidi, Moulay Rachid; Kouach, Jaouad; Rahali, Driss Moussaoui; Dehayni, Mohamed

    2015-01-01

    La grossesse sur cicatrice de césarienne est une forme rare de grossesse ectopique qui engage le pronostic vital et fonctionnel utérin par hémorragie ou par rupture utérine précoce. Nous rapportons le cas d'une grossesse ectopique sur cicatrice de césarienne diagnostiquée à 11 semaines d'aménorrhée suite à une aspiration blanche pour grossesse arrêtée chez une patiente de 43 ans porteuse d'un utérus bi-cicatriciel. A travers cette observation ainsi qu'une revue de la littérature les auteurs vont essayer de mettre le point sur les méthodes diagnostiques et thérapeutiques de cette entité rare afin d'améliorer la prise en charge. PMID:26213603

  17. Adsorption de gaz sur les materiaux microporeux modelisation, thermodynamique et applications

    NASA Astrophysics Data System (ADS)

    Richard, Marc-Andre

    2009-12-01

    Nos travaux sur l'adsorption de gaz dans les materiaux microporeux s'inscrivent dans le cadre des recherches visant a augmenter l'efficacite du stockage de l'hydrogene a bord des vehicules. Notre objectif etait d'etudier la possibilite d'utiliser l'adsorption afin d'ameliorer l'efficacite de la liquefaction de l'hydrogene des systemes a petite echelle. Nous avons egalement evalue les performances d'un systeme de stockage cryogenique de l'hydrogene base sur la physisorption. Comme nous avons affaire a des plages de temperatures particulierement etendues et a de hautes pressions dans la region supercritique du gaz, nous avons du commencer par travailler sur la modelisation et la thermodynamique de l'adsorption. La representation de la quantite de gaz adsorbee en fonction de la temperature et de la pression par un modele semi-empirique est un outil utile pour determiner la masse de gaz adsorbee dans un systeme mais egalement pour calculer les effets thermiques lies a l'adsorption. Nous avons adapte le modele Dubinin-Astakhov (D-A) pour modeliser des isothermes d'adsorption d'hydrogene, d'azote et de methane sur du charbon actif a haute pression et sur une grande plage de temperatures supercritiques en considerant un volume d'adsorption invariant. Avec cinq parametres de regression (incluant le volume d'adsorption Va), le modele que nous avons developpe permet de tres bien representer des isothermes experimentales d'adsorption d'hydrogene (de 30 a 293 K, jusqu'a 6 MPa), d'azote (de 93 a 298 K, jusqu'a 6 MPa) et de methane (de 243 a 333 K, jusqu'a 9 MPa) sur le charbon actif. Nous avons calcule l'energie interne de la phase adsorbee a partir du modele en nous servant de la thermodynamique des solutions sans negliger le volume d'adsorption. Par la suite, nous avons presente les equations de conservation de la niasse et de l'energie pour un systeme d'adsorption et valide notre demarche en comparant des simulations et des tests d'adsorption et de desorption. En plus de l

  18. Visual Analysis and Dissemination of Scientific Literature Collections with SurVis.

    PubMed

    Beck, Fabian; Koch, Sebastian; Weiskopf, Daniel

    2016-01-01

    Bibliographic data such as collections of scientific articles and citation networks have been studied extensively in information visualization and visual analytics research. Powerful systems have been built to support various types of bibliographic analysis, but they require some training and cannot be used to disseminate the insights gained. In contrast, we focused on developing a more accessible visual analytics system, called SurVis, that is ready to disseminate a carefully surveyed literature collection. The authors of a survey may use our Web-based system to structure and analyze their literature database. Later, readers of the survey can obtain an overview, quickly retrieve specific publications, and reproduce or extend the original bibliographic analysis. Our system employs a set of selectors that enable users to filter and browse the literature collection as well as to control interactive visualizations. The versatile selector concept includes selectors for textual search, filtering by keywords and meta-information, selection and clustering of similar publications, and following citation links. Agreement to the selector is represented by word-sized sparkline visualizations seamlessly integrated into the user interface. Based on an analysis of the analytical reasoning process, we derived requirements for the system. We developed the system in a formative way involving other researchers writing literature surveys. A questionnaire study with 14 visual analytics experts confirms that SurVis meets the initially formulated requirements.

  19. Evaluation des connaissances des parents sur les bronchiolites aiguës

    PubMed Central

    Gueddari, Widad; Tazi, Abderrahmane; Ouardi, Amine; Nani, Samira; Zineddine, Abdelhadi

    2014-01-01

    Les infections respiratoires (IR) constituent la deuxième cause de mortalité infantile au Maroc, dû en partie à l'absence d'information et de sensibilisation. Le but de ce travail était d’évaluer les connaissances des parents sur la bronchiolite aiguë, infection respiratoire très fréquente. Nous avons réalisé une enquête basée sur un questionnaire, auprès de parents de nourrissons consultants pour toux, avec ou sans gêne respiratoire. 180 parents ont été inclus dans l’étude. Les parents pensaient que l'infection respiratoire était secondaire au climat froid (96%); seuls 4% ont évoqué une origine infectieuse. Aucun des parents ne savait que le lavage des mains était un moyen de prévention de la transmission. Les parents ont majoritairement répondu que la kinésithérapie respiratoire ne servait à rien (65%), et qu'elle était nocive (24.5%). Ce manque de connaissances fondamentales en matière d'IR et de bronchiolite en particulier, devrait inciter à entreprendre un programme de sensibilisation PMID:25328606

  20. Modifications vibrationnelles induites par différentes vapeurs acides sur les polyanilines

    NASA Astrophysics Data System (ADS)

    Cochet, M.; Quillard, S.; Buisson, J. P.; Lefrant, S.; Louarn, G.

    1998-06-01

    We present a comparative study of conductive form of polyaniline, i.e, polyemeraldine doped with HCl vapor or with HCSA upon m-cresol vapor. UV-Vis.-nir absorption measurements on polyaniline thin films, vs acid vapors time exposure, have been made. In the same way, Raman spectra have been recorded with different excitation lines from the blue and red ranges to the infrared region. Finally, an assignment of Raman bands observed, is proposed and confirmed by vibrational calculations based on valence-force-field. Nous présentons une étude comparative de la forme conductrice de la polyaniline, c'est-à-dire de la polyéméraldine dopée par des vapeurs d'HCl ou dopée par l'acide camphre sulfonique (HCSA) sous vapeurs de m-crésol. Des mesures d'absorption UV-Vis-proche infrarouge sur des films minces de polyaniline, en fonction du temps d'exposition aux vapeurs acides, ont été réalisées. Parallèlement, les spectres Raman ont été obtenus pour différentes longueurs d'onde d'excitation allant du visible jusqu'au proche infrarouge. Finalement, une attribution des bandes Raman observées est proposée et confirmée par des calculs vibrationnels basés sur des champs de force de valence.

  1. Volvulus du grêle sur paquet d’ascaris: à propos d’un cas

    PubMed Central

    Diouf, Cheikh; Kane, Ahmed; Ndoye, Ndeye Aby; Ndour, Oumar; Faye-Fall, Aimé Lakh; Fall, Mbaye; Alumeti, Désiré Munyali; Ngom, Gabriel

    2016-01-01

    Nous rapportons un cas exceptionnel de volvulus nécrosé de l'intestin grêle dû à des ascaris adultes chez un enfant de 7 ans. A l'admission, l'enfant présentait le tableau d'occlusion intestinale qui évoluait depuis deux jours avec altération de l'état général. La radiographie de l'abdomen sans préparation retrouvait des niveaux hydroaériques de type grêlique et un aspect tigré évoquant le diagnostic d'une occlusion intestinale haute sur masse abdominale. Après la réanimation, le traitement chirurgical consistait en une laparotomie qui avait retrouvé un volvulus nécrosé de l'iléon terminale contenant des ascaris adultes. Une résection du grêle sur environ un mètre emportant le segment nécrosé suivie d'une iléostomie était réalisée. L'évolution a été favorable, l'anastomose iléo-colique fut réalisée quatre semaines plus tard. Au recul de deux ans l'enfant est indemne de tout symptôme. PMID:27795803

  2. Effet de la composition des materiaux composites sur la caracterisation et detection par ondes de Lamb

    NASA Astrophysics Data System (ADS)

    Ostiguy, Pierre-Claude

    Les matériaux composites sont de plus en plus utilisés en aéronautique. Leurs excellentes propriétés mécaniques et leur faible poids leur procurent un avantage certain par rapport aux matériaux métalliques. Ceux-ci étant soumis à diverses conditions de chargement et environnementales, ils sont suceptibles de subir plusieurs types d'endommagements, compromettant leur intégrité. Des méthodes fiables d'inspection sont donc nécessaires pour évaluer leur intégrité. Néanmoins, peu d'approches non destructives, embarquées et efficaces sont présentement utilisées. Ce travail de recherche se penche sur l'étude de l'effet de la composition des matériaux composites sur la détection et la caractérisation par ondes guidées. L'objectif du projet est de développer une approche de caractérisation mécanique embarquée permettant d'améliorer la performance d'une approche d'imagerie par antenne piézoélectriques sur des structures composite et métalliques. La contribution de ce projet est de proposer une approche embarquée de caractérisation mécanique par ultrasons qui ne requiert pas une mesure sur une multitude d'échantillons et qui est non destructive. Ce mémoire par articles est divisé en quatre parties, dont les parties deux A quatre présentant les articles publiés et soumis. La première partie présente l'état des connaissances dans la matière nécessaires à l'acomplissement de ce projet de maîtrise. Les principaux sujets traités portent sur les matériaux composites, propagation d'ondes, la modélisation des ondes guidées, la caractérisation par ondes guidées et la surveillance embarquée des structures. La deuxième partie présente une étude de l'effet des propriétés mécaniques sur la performance de l'algorithme d'imagerie Excitelet. L'étude est faite sur une structure isotrope. Les résultats ont démontré que l'algorithme est sensible à l'exactitude des propriétés mécaniques utilisées dans le modèle. Cette

  3. Implementation of tsunami disaster prevention measures in the municipality of San Rafael del Sur, Nicaragua

    NASA Astrophysics Data System (ADS)

    Strauch, W.; Talavera, E.; Acosta, N.; Sanchez, M.; Mejia, E.

    2007-05-01

    The Nicaraguan Pacific coast presents considerable tsunami risk. On September 1, 1992, a tsunami caused enormous damage in the infrastructure and killed more than 170 people. A pilot project was conducted between 2006 and 2007 in the municipality of San Rafel del Sur, area of Masachapa, The project included multiple topics of tsunami prevention measures and considering the direct participation of the local population, as: -General education on disaster prevention, participative events; -Investigation of awareness level and information needs for different population groups; -Specific educational measures in the schools; -Publication of brochures, calendars, news paper articles, radio programs, TV spots -Development of local tsunami hazard maps, 1:5,000 scale; (based on previous regional tsunami hazard mapping projects and local participation) -Development of a tsunami warning plan; -Improvements of the national tsunami warning system. -Installation of sirens for tsunami warning -Installation of tsunami signs, indicating hazardous areas, evacuation routes, safe places; -Realization of evacuation drills in schools. Based on the experiences gained in Masachapa it is planned to run similar projects in other areas along the Nicaraguan Pacific coast. In the project participated the local municipality and local stakeholders of San Rafael del Sur, Ministry of Education, National Police, Nicaraguan Red Cross, Ministry of Health, Ministry of Tourism, Nicaraguan Geosciences Institute (INETER), National System for Disaster Prevention (SINAPRED), Swiss Agency for Development and Cooperation (SDC). It was financed by SDC and INETER.

  4. Les enjuex éthiques entourant la recherche en santé sur les enfants

    PubMed Central

    2008-01-01

    RÉSUMÉ La recherche en santé est un devoir moral parce qu’elle est la base des soins probants prodigués par tous les dispensateurs de soins. Des politiques et des règlements précis régissent la tenue des recherches sur des humains. Il faut procéder à une évaluation éthique d’un projet de recherche donné avant de pouvoir l’entreprendre. La recherche sur les enfants pose d’énormes défis en matière de consentement éclairé et d’assentiment, de vulnérabilité et de potentiel de conflit d’intérêts (CDI). Les chercheurs en santé pédiatrique devraient prôner la participation des enfants à la recherche, tout en se montrant attentifs à en limiter les risques.

  5. Describing the Elephant: Framing a Discussion on Command and Control

    DTIC Science & Technology

    2014-08-01

    operations in support of combat- ant commanders. A master navigator with more than 4,200 flying hours, pri- marily in the RC-135 Rivet Joint and E-8C JSTARS...that term varies across the levels of war; by service, mediums, career fields, and platforms; and across the realms of academics, joint -requirements...the battlespace. Although designed to be platform agnostic, most of the articles incorporate recent experience with the Joint Sur- veillance Target

  6. Interteaching: Discussion Group Size and Course Performance

    ERIC Educational Resources Information Center

    Truelove, Jacob C.; Saville, Bryan K.; Van Patten, Ryan

    2013-01-01

    Researchers have yet to examine whether discussion group size affects student performance in an interteaching-based course. In the current study, we addressed this question by manipulating discussion group size (smaller groups of 2 students vs. larger groups of 4 students) across 2 sections of an undergraduate psychology course. We found no…

  7. A Workbook for Training Discussion Leaders.

    ERIC Educational Resources Information Center

    Menkin, Paula

    This guide on group discussion leader training provides for a four session course structured to enable each trainee to practice and be evaluated. Session 1 stresses the nature and uses of discussion, and introduces trainees to role playing. Other sessions concentrate on summarizing and decision making; on group satisfaction or problem solving and…

  8. Assessing Student Contributions to Online Discussion Boards

    ERIC Educational Resources Information Center

    Smith, Helen

    2008-01-01

    The use of online learning is prevalent in higher education, in particular the use of Blackboard and other similar virtual learning environments (VLEs). Students' participation in online discussion forums is a common activity and the online threaded discussion tool provides opportunities for students to: (1) form collaborative groups for…

  9. The Adventure of the Discussion Board.

    ERIC Educational Resources Information Center

    Davis, Don

    This paper describes the frustration with the lack student involvement in classroom discussions regarding significant issues of the California State History Social Science Standards, specifically on politics and media. The initial use of a discussion board produced disappointing results. Very few students participated and their responses did not…

  10. Building Fires: Raising Achievement through Class Discussion

    ERIC Educational Resources Information Center

    Kahn, Elizabeth

    2007-01-01

    According to a growing body of research, discussion-based instruction, in the context of high academic demands, significantly enhances student achievement in reading. The effects apply to below- as well as above-average-ability students. These findings confirm what secondary English teachers have believed all along about the value of discussion.…

  11. Comparing Tasks and Skills in Developing Discussions.

    ERIC Educational Resources Information Center

    Robinson, Peter; Strong, Gregory; Whittle, Jennifer

    Developing the skills necessary to participate in academic discussions is an important goal in many programs of English for academic purposes. However, there has been little empirical investigation into how verbal and nonverbal aspects of discussion abilities might be developed. This paper reports the results of a semester-long effect of…

  12. Integrating Online Discussion: Broadening the Conversation

    ERIC Educational Resources Information Center

    Li, Qing

    2006-01-01

    This article shares an approach to teaching mathematics teacher education courses incorporating asynchronous online discussions. Specifically, this research is guided by the following research questions: (a) How would online discussions contribute or hinder teachers' learning in mathematics methods courses? and (b) What pedagogical strategies need…

  13. Managing the Paradoxes of Discussion Pedagogy

    ERIC Educational Resources Information Center

    Piro, Jody S.; Anderson, Gina

    2015-01-01

    Discussion pedagogy is part of a larger curricular goal that intersects the two aspirations of diversity of perspectives and democratic inquiry in that it challenges stereotypes and assumptions through student discourse. Yet, teaching with discussion is a complex and sometimes ambiguous endeavor that leaves instructors feeling pulled between…

  14. Discussion Starters. Technical Note No. 25.

    ERIC Educational Resources Information Center

    Yunus, Ibrahim; Dilts, Russ

    Discussion starters, the result of collaboration between the Indonesian Directorate General of Nonformal Education, Youth, and Sports, and World Education, Inc., are simple learning tools used to generate discussion among community groups involved in nonformal education. Appropriate in and adaptable to a variety of settings, content areas, and…

  15. Accounting for Outcomes in Case Discussions.

    ERIC Educational Resources Information Center

    Corrigan, Stephanie Zweig; Morine-Dershimer, Greta

    This study analyzes the reaction essays of 24 elementary preservice teachers who read and discussed the same case. The preservice teachers were in two different sections of the same special topics course. Care was taken to balance the sections as closely as possible by age, ethnicity, and major areas. Graduate discussion leaders were chosen to…

  16. Learning Reading Strategies with Online Discussion

    ERIC Educational Resources Information Center

    Liu, I-Fang; Ko, Hwa-Wei; Wu, Sheng-Yi

    2014-01-01

    Teachers experience difficulty demonstrating prediction strategies and leading discussions in traditional classrooms. It is also unclear whether online discussion can contribute to reading comprehension. The purpose of this study is to create an online reading system to investigate whether learners can acquire reading strategies and enhance their…

  17. Preparing Teachers to Lead Mathematics Discussions

    ERIC Educational Resources Information Center

    Boerst, Timothy A.; Sleep, Laurie; Ball, Deborah Loewenberg; Bass, Hyman

    2011-01-01

    Background/Context: Discussion is central to mathematics teaching and learning, as well as to mathematics as an academic discipline. Studies have shown that facilitating discussions is complex work that is not easily done or learned. To make such complex aspects of the work of teaching learnable by beginners, recent research has focused on…

  18. Global Leadership Competencies: A Review and Discussion

    ERIC Educational Resources Information Center

    Jokinen, Tiina

    2005-01-01

    Purpose: From the competency point of view, this article aims to review and discuss existing global leadership and other related literature, and to combine findings and suggestions provided in previous literature in a more integrative framework of global leadership competencies. Design/methodology/approach: The paper reviews and discusses the…

  19. Public Energy Education: Issues for Discussion. Draft.

    ERIC Educational Resources Information Center

    Public Energy Education Task Force.

    This paper was intended to stimulate discussion of energy education issues at a conference on energy issues. The discussion ranges through numerous topics at issue in energy education including public energy awareness, definition of public education, the distinction between public education and public relations, and the presentation of a model…

  20. Enhancing Understanding and Interest through Group Discussion

    ERIC Educational Resources Information Center

    Cannon, Patrick

    2006-01-01

    Group discussion allows students to learn how to "talk to someone." Through group discussion, students can acquire or refine a broad range of attributes, from basic oratory skills to a more sophisticated development of communicative competence to embracing and valuing dialogic interchange and reflexivity. In this article, the author explains how…

  1. National GAP Conference 2007-Discussion Groups Report

    USGS Publications Warehouse

    Ratz, Joan M.; Lamb, Berton Lee

    2010-01-01

    We led two discussion groups during the 2007 National GAP Conference. These discussion groups provided information to help develop a survey of National Gap Analysis Program (GAP) data users. One group discussed technical issues, and the second group discussed the use of GAP data for decisionmaking. Themes emerging from the technical issues group included concerns about data quality, need for information on how to use data, and passive data distribution. The decisionmaking discussion included a wide range of topics including the need to understand presentation of information, the need to connect with and understand users of data, the revision of GAP's mission, and the adaptability of products and data. The decisionmaking group also raised concerns regarding technical issues. One conclusion is that a deep commitment to ongoing information transfer and support is a key component of success for the GAP program.

  2. Discussion Forum for Technical Codes Users

    SciTech Connect

    Kaspar, Bryce P.; Dillon, Heather E.

    2006-03-30

    One goal of the Building Energy Codes Program (BECP) is to provide useful, easy to understand information about the national energy codes. A forum where users could ask for, and receive clarification on these codes and software from other users would allow the Energy codes project to reach and instruct a broader audience for a modest resource cost. The forum proposed would be a staff moderated discussion board where staff would post topics, and users would post discussion of those topics, with staff joining in to the discussions. The forum would be moderated by staff members, to remove objectionable and irrelevant postings, and to answer any technical questions that arise. The topics and discussions would be archived and searchable to allow users to answer their own questions, if they pertain to a previously discussed topic.

  3. Joint Discussion 14 Modeling dense stellar systems

    NASA Astrophysics Data System (ADS)

    Sills, Alison I.; Subr, Ladislav; Portegies Zwart, Simon F.

    2007-08-01

    Joint Discussion 14 was held at the General Assembly of the International Astronomical Union from August 17 until 23 in the beautiful Bohemian capital, Prague. The blueprints for this meeting were laid out during the MODEST-5 workshop, held in the Canadian city of Hamilton, Ontario in August 2004. We were sitting in a nice cafe with local brew and food, discussing the future of the MODEST community when we posed the idea for this Joint Discussion at the General Assembly. The meeting was then coined MODEST-7.

  4. Exploring the Use of Discussion Strategies and Labels in Asynchronous Online Discussion

    ERIC Educational Resources Information Center

    Gao, Fei

    2014-01-01

    Drawing on research in constrained online discussion environments and strategy instruction, this approach combines explicit instruction on discussion strategies with the use of post type labels. In a trial of this approach in an online course, students actively used the discussion strategies and post type labels in their discussions. Analysis of…

  5. Lignes directrices pour le suivi des cardiostimulateurs au canada : consensus du groupe de travail canadien sur la cardiostimulation

    PubMed

    D Fraser JD; M Gillis AM; Irwin; Nishimura; Tyers; Philippon

    2000-03-01

    Un sondage sur les pratiques de cardiostimulation au Canada effectue en 1997 a revele un profond desir pour des lignes directrices nationales sur le suivi des cardiostimulateurs. Ces lignes directrices sur le suivi des cardiostimulateurs representent une declaration de consensus du Groupe de travail canadien sur la cardiostimulation. Le suivi des patients en personne plutot que par moyens transtelephoniques est preferable. Les patients devraient etre examines au minimum dans les 72 heures suivant l'implantation, 2 a 12 semaines et 6 mois apres l'implantation, et annuellement par la suite. Des examens plus frequents peuvent etre requis pour certains patients. Ceci dependra des problemes cardiovasculaires associes et des appareils en particulier. Une visite de suivi typique devrait comprendre un examen cardiovasculaire oriente, l'interrogation du systeme de cardiostimulation et une revue des donnees de telemetrie, un examen du rythme sous-jacent, un examen des seuils de stimulation et de detection et une reprogrammation adequate des parametres pour optimaliser le fonctionnement et la longevite de l'appareil.

  6. A Mouse Model of Human Hyperinsulinism Produced by the E1506K Mutation in the Sulphonylurea Receptor SUR1

    PubMed Central

    Shimomura, Kenju; Tusa, Maija; Iberl, Michaela; Brereton, Melissa F.; Kaizik, Stephan; Proks, Peter; Lahmann, Carolina; Yaluri, Nagendra; Modi, Shalem; Huopio, Hanna; Ustinov, Jarkko; Otonkoski, Timo; Laakso, Markku; Ashcroft, Frances M.

    2013-01-01

    Loss-of-function mutations in the KATP channel genes KCNJ11 and ABCC8 cause neonatal hyperinsulinism in humans. Dominantly inherited mutations cause less severe disease, which may progress to glucose intolerance and diabetes in later life (e.g., SUR1-E1506K). We generated a mouse expressing SUR1-E1506K in place of SUR1. KATP channel inhibition by MgATP was enhanced in both homozygous (homE1506K) and heterozygous (hetE1506K) mutant mice, due to impaired channel activation by MgADP. As a consequence, mutant β-cells showed less on-cell KATP channel activity and fired action potentials in glucose-free solution. HomE1506K mice exhibited enhanced insulin secretion and lower fasting blood glucose within 8 weeks of birth, but reduced insulin secretion and impaired glucose tolerance at 6 months of age. These changes correlated with a lower insulin content; unlike wild-type or hetE1506K mice, insulin content did not increase with age in homE1506K mice. There was no difference in the number and size of islets or β-cells in the three types of mice, or evidence of β-cell proliferation. We conclude that the gradual development of glucose intolerance in patients with the SUR1-E1506K mutation might, as in the mouse model, result from impaired insulin secretion due a failure of insulin content to increase with age. PMID:23903354

  7. Endocardite infectieuse sur communication interventriculaire: intérêt de l’échocardiographie? de l’antibioprophylaxie?

    PubMed Central

    Boussir, Hanane; Ghalem, Amine; Ismaili, Nabila; El Ouafi, Noha

    2016-01-01

    L’endocardite infectieuse peut survenir sur un cœur sain ou pathologique. Parmi les cardiopathies à risque, on trouve les cardiopathies congénitales dont la CIV est la plus fréquente. Nous rapportons le cas d’une endocardite infectieuse à streptocoque oral, survenue sur une CIV non connue jusqu’à maintenant, chez un patient de 17 ans, se présentant sous forme de fièvre prolongée associée à une éruption cutanée. L’examen de la sphère ORL révéla par ailleurs des angines pseudomembraneuses avec un mauvais état buccodentaire. Les EI sur CIV sont les plus fréquentes des EI sur cardiopathie congénitale. Leur présentation clinique peut être atypique d’où le rôle primordial de l’échocardiographie. La prévention dans ces cas passe par une hygiène bucco-dentaire et cutanée optimale et non par une antibioprophylaxie. PMID:28292116

  8. SurA Is Involved in the Targeting to the Outer Membrane of a Tat Signal Sequence-Anchored Protein

    PubMed Central

    Rondelet, Arnaud

    2012-01-01

    The twin arginine translocation (Tat) pathway exports folded proteins from the cytoplasm to the periplasm of bacteria. The targeting of the exported proteins to the Tat pathway relies on a specific amino-terminal signal sequence, which is cleaved after exportation. In the phytopathogen Dickeya dadantii, the pectin lyase homologue PnlH is exported by the Tat pathway without cleavage of its signal sequence, which anchors PnlH into the outer membrane. In proteobacteria, the vast majority of outer membrane proteins consists of β-barrel proteins and lipoproteins. Thus, PnlH represents a new kind of outer membrane protein. In Escherichia coli, periplasmic chaperones SurA, Skp, and DegP work together with the β-barrel assembly machinery (Bam) to target and insert β-barrel proteins into the outer membrane. In this work, we showed that SurA is required for an efficient targeting of PnlH to the outer membrane. Moreover, we were able to detect an in vitro interaction between SurA and the PnlH signal sequence. Since the PnlH signal sequence contains a highly hydrophobic region, we propose that SurA protects it from the hydrophobic periplasm during targeting of PnlH to the outer membrane. We also studied the nature of the information carried by the PnlH signal sequence responsible for its targeting to the outer membrane after exportation by the Tat system. PMID:22961852

  9. Prevalence of infection with Toxoplasma gondii in landrace and mixed breed pigs slaughtered in Baja California Sur state, Mexico

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Purpose We performed a cross-sectional study to determine the seroprevalence of Toxoplasma gondii infection in 308 domestic pigs slaughtered in La Paz, Baja California Sur State, Mexico using the modified agglutination test (MAT, cut off 1:25). Results Forty (13%) of the 308 pigs were seropositive ...

  10. Effets de la pollution de l’air sur la santé

    PubMed Central

    Abelsohn, Alan; Stieb, Dave M.

    2011-01-01

    Résumé Objectif Faire connaître aux médecins de famille les effets de la pollution atmosphérique sur la santé et indiquer quels conseils donner aux patients vulnérables pour qu’ils soient moins exposés. Sources de l’information On a consulté MEDLINE à l’aide des termes relatifs à la pollution atmosphérique et à ses effets indésirables. On a révisé les articles en anglais publiés entre janvier 2008 et décembre 2009. La plupart des études contenaient des preuves de niveau II. Principal message Au Canada, la pollution de l’air extérieur cause une morbidité et une mortalité importantes. Elle peut affecter le système respiratoire (exacerbation de l’asthme et de la maladie pulmonaire obstructive chronique) et le système cardiovasculaire (déclencher l’arythmie, l’insuffisance cardiaque et les AVC). La cote air santé (CAS) est un nouvel outil de communication mis au point par Santé Canada et Environnement Canada qui indique sur une échelle de 1 à 10, le risque pour la santé causé par la pollution atmosphérique. La CAS est largement diffusée dans les médias et cet outil pourrait être utile au médecin de famille pour inciter les patients à haut risque (comme ceux qui souffrent d’asthme, de maladie pulmonaire obstructive chronique ou d’insuffisance cardiaque) à réduire leur exposition à la pollution atmosphérique. Conclusion Le médecin de famille peut se servir de la CAS et de ses messages sur la santé pour enseigner aux asthmatiques et aux autres patients à risque élevé la façon de réduire les risques pour la santé causés par la pollution atmosphérique.

  11. Student Inquiry in a Physics Class Discussion.

    ERIC Educational Resources Information Center

    Hammer, David

    1995-01-01

    Analyzes a short excerpt from a high school physics class discussion to consider the value of the students' work as inquiry and to illustrate a teacher's negotiation of the tension between inquiry and traditional content-oriented concerns. (MDM)

  12. Dr. Irvin Yalom Discusses Group Psychotherapy.

    ERIC Educational Resources Information Center

    Forester-Miller, Holly

    1989-01-01

    In this interview, Dr. Irvin Yalom, director of the Adult Psychiatry Clinic at Stanford University School of Medicine, discusses his beginnings as a group psychotherapist, current issues in group work, and the future of group work. (Author/TE)

  13. Divisions Panel Discussion: Astronomy for Development

    NASA Astrophysics Data System (ADS)

    Govender, Kevin; Hemenway, Mary Kay; Wolter, Anna; Haghighipour, Nader; Yan, Yihua; van Dishoeck, E. F.; Silva, David; Guinan, Edward

    2016-10-01

    The main purpose of this panel discussion was to encourage conversation around potential collaborations between the IAU Office of Astronomy for Development (OAD) and IAU Divisions. The discussion was facilitated by the OAD and the conversation revolved mainly around two questions: (i) What should the OAD be doing to enhance the work of the Divisions? (ii) What could the Divisions (both members and respective scientific discipline in general) contribute towards the implementation of the IAU strategic plan?

  14. Refiners discuss HF alkylation process and issues

    SciTech Connect

    Not Available

    1992-04-06

    Safety and oxygenate operations made HF alkylation a hot topic of discussion at the most recent National Petroleum Refiners Association annual question and answer session on refining and petrochemical technology. This paper provides answers to a variety of questions regarding the mechanical, process, and safety aspects of the HF alkylation process. Among the issues discussed were mitigation techniques, removal of oxygenates from alkylation unit feed, and amylene alkylation.

  15. Ophthalmic Combination of SurR9-C84A and Trichostatin-A Targeting Molecular Pathogenesis of Alkali Burn

    PubMed Central

    Roy, Kislay; Sriramoju, Bhasker; Kanwar, Rupinder K.; Kanwar, Jagat R.

    2016-01-01

    Background: Alkali burn is a frequently occurring ocular injury that resembles ocular inflammation caused by eye allergies, infection, and refractive surgeries. Methods: We investigated the synergistic regenerative potential of dominant negative survivin mutant (SurR9-C84A) and histone deacetylase (HDAC) inhibitor trichostatin-A (TSA) against alkali burn and corneal haze using human keratocytes and rabbit alkali burn model (Female New Zealand white rabbits). Results: Combination of SurR9-C84A and TSA suppressed levels of transforming growth factor (TGF)-β, alpha smooth-muscle actin (α-SMA), fibronectin and HDAC1, leading to apoptosis in myofibroblast cells and, showed the potential to clear the corneal haze. An insult with 0.5 N NaOH for 1 min led to neutrophils infiltration and formation of large vacuoles in the stroma. Treatments with TSA and SurR9-C84A for 40 min led to improvement in the conjunctival and corneal tissue integrity, marked by an increase in clathrin, and claudin expressions. An increase in TGF-β and endogenous survivin confirmed wound healing and cell proliferation in rabbit cornea. The blood analysis revealed a substantial decrease in the RBC, WBC, platelets, or the hemoglobin content post alkali burn. The cytokine array analysis revealed that NaOH induced expressions of IL-1α and MMP-9, which were found to be significantly downregulated (1.8 and 11.5 fold respectively) by the combinatorial treatment of SurR9-C84A and TSA. Conclusion: Our results confirmed that combination of SurR9-C84A with TSA worked in synergy to heal ocular injury and inflammations due to alkali burn and led to the regeneration of ocular tissue by increasing clathrin, claudin, survivin, and TGF-β and reversal of alkali burn by suppressing IL-1α and MMP-9 without inducing haze. PMID:27516741

  16. Late Cardiac Events after Childhood Cancer: Methodological Aspects of the Pan-European Study PanCareSurFup

    PubMed Central

    Feijen, Elizabeth A. M.; Font-Gonzalez, Anna; van Dalen, Elvira C.; van der Pal, Helena J. H.; Reulen, Raoul C.; Winter, David L.; Kuehni, Claudia E.; Haupt, Riccardo; Alessi, Daniela; Byrne, Julianne; Bardi, Edit; Jakab, Zsuzsanna; Grabow, Desiree; Garwicz, Stanislaw; Jankovic, Momcilo; Levitt, Gill A.; Skinner, Roderick; Zadravec Zaletel, Lorna; Hjorth, Lars; Tissing, Wim J. E.; de Vathaire, Florent; Hawkins, Mike M.; Kremer, Leontien C. M.

    2016-01-01

    Background and Aim Childhood cancer survivors are at high risk of long-term adverse effects of cancer and its treatment, including cardiac events. The pan-European PanCareSurFup study determined the incidence and risk factors for cardiac events among childhood cancer survivors. The aim of this article is to describe the methodology of the cardiac cohort and nested case-control study within PanCareSurFup. Methods Eight data providers in Europe participating in PanCareSurFup identified and validated symptomatic cardiac events in their cohorts of childhood cancer survivors. Data on symptomatic heart failure, ischemia, pericarditis, valvular disease and arrhythmia were collected and graded according to the Criteria for Adverse Events. Detailed treatment data, data on potential confounders, lifestyle related risk factors and general health problems were collected. Results The PanCareSurFup cardiac cohort consisted of 59,915 5-year childhood cancer survivors with malignancies diagnosed between 1940 and 2009 and classified according to the International Classification of Childhood Cancer 3. Different strategies were used to identify cardiac events such as record linkage to population/ hospital or regional based databases, and patient- and general practitioner-based questionnaires. Conclusion The cardiac study of the European collaborative research project PanCareSurFup will provide the largest cohort of 5-year childhood cancer survivors with systematically ascertained and validated data on symptomatic cardiac events. The result of this study can provide information to minimize the burden of cardiac events in childhood cancer survivors by tailoring the follow-up of childhood cancer survivors at high risk of cardiac adverse events, transferring this knowledge into evidence-based clinical practice guidelines and providing a platform for future research studies in childhood cancer patients.  PMID:27643694

  17. The Periplasmic Bacterial Molecular Chaperone SurA Adapts Its Structure to Bind Peptides in Different Conformations to Assert a Sequence Preference for Aromatic Residues

    SciTech Connect

    Xu, X.; Wang, S.; Hu, Y.-X.; McKay, D.B.

    2009-06-04

    The periplasmic molecular chaperone protein SurA facilitates correct folding and maturation of outer membrane proteins in Gram-negative bacteria. It preferentially binds peptides that have a high fraction of aromatic amino acids. Phage display selections, isothermal titration calorimetry and crystallographic structure determination have been used to elucidate the basis of the binding specificity. The peptide recognition is imparted by the first peptidyl-prolyl isomerase (PPIase) domain of SurA. Crystal structures of complexes between peptides of sequence WEYIPNV and NFTLKFWDIFRK with the first PPIase domain of the Escherichia coli SurA protein at 1.3 A resolution, and of a complex between the dodecapeptide and a SurA fragment lacking the second PPIase domain at 3.4 A resolution, have been solved. SurA binds as a monomer to the heptapeptide in an extended conformation. It binds as a dimer to the dodecapeptide in an alpha-helical conformation, predicated on a substantial structural rearrangement of the SurA protein. In both cases, side-chains of aromatic residues of the peptides contribute a large fraction of the binding interactions. SurA therefore asserts a recognition preference for aromatic amino acids in a variety of sequence configurations by adopting alternative tertiary and quaternary structures to bind peptides in different conformations.

  18. Amplification Raman stimulée de signaux hyperfréquences sur porteuse optique

    NASA Astrophysics Data System (ADS)

    Keïta, K.; Delaye, P.; Frey, R.; Roosen, G.; Dolfi, D.; Huignard, J.-P.

    2006-10-01

    À l'heure actuelle, lorsque l'on souhaite amplifier une porteuse optique, la solution consiste à utiliser un amplificateur à fibre dopée Erbium (EDFA). Toutefois, un problème se pose lorsque le signal modulant se trouve dans le domaine hyperfréquence car ces applications (principalement radars) demandent d'obéir à des critères de qualité très sévères. Nous démontrons ici la supériorité en termes de bruit de l'amplificateur Raman à fibre sur l'EDFA lorsqu'il s'agit d'amplifier de faibles signaux.

  19. Contributions from Particles in Europe (PiE) 2010, Villefranche-sur-Mer, France: an introduction

    NASA Astrophysics Data System (ADS)

    Mikkelsen, Ole A.; Chami, Malik; Doxaran, David

    2012-04-01

    This special issue of Geo-Marine Letters presents selected contributions from the international conference Particles in Europe (PiE) 2010 organized by Sequoia Scientific, Inc., and the Laboratoire d'Océanographie de Villefranche (LOV) on 15-17 November 2010 in Villefranche-sur-Mer, France, and guest-edited by Ole Mikkelsen, Malik Chami and David Doxaran. PiE was initiated in 2008, in order to promote and further our understanding of the importance of suspended particulate matter (SPM) for a very wide range of processes in the aquatic environment—from optics and acoustics, over sediment transport, to the global carbon balance. The papers in this special issue are in particular concerned with the interaction between SPM and water optical properties, as well as how to use optical proxy measurements to understand SPM processes. The next PiE conference is scheduled for 17-19 October 2012 in Barcelona, Spain.

  20. Metal concentrations in demersal fish species from Santa Maria Bay, Baja California Sur, Mexico (Pacific coast).

    PubMed

    Jonathan, M P; Aurioles-Gamboa, David; Villegas, Lorena Elizabeth Campos; Bohórquez-Herrera, Jimena; Hernández-Camacho, Claudia J; Sujitha, S B

    2015-10-15

    Concentrations of 11 trace metals (Fe, Mn, Cr, Cu, Ni, Co, Pb, Zn, Cd, As, Hg) in 40 fish species from Santa Maria Bay, Baja California Sur, Mexico, the strategically important area for marine mammals and organisms were analyzed. Based on their concentrations the ranking of metals Fe>Zn>Ni>Cr>Mn>Pb>Cu>Co>As>Cd>Hg suggests that organism size, metabolism and feeding habits are correlated with metal concentrations. Local geological formations affect the concentrations of different metals in the aquatic environment and are subsequently transferred to fishes. The correlation analysis suggests that metabolism and nurturing habits impact the concentration of metals. Concentrations of Fe and Mn appear to be influenced by scavenging and absorption processes, which vary by species. The considerable variability in the metal concentrations obtained in different species underscores the importance of regular monitoring.

  1. Recommandations sur l’examen pelvien de dépistage systématique

    PubMed Central

    Tonelli, Marcello; Gorber, Sarah Connor; Moore, Ainsley; Thombs, Brett D.

    2016-01-01

    Résumé Objectif Examiner les lignes directrices de 2014 de l’American College of Physicians (ACP) en matière d’examens pelviens de dépistage du cancer (autre que du col), des maladies inflammatoires pelviennes ou d’autres affections gynécologiques bénignes afin de déterminer si les lignes directrices de l’ACP en matière d’examens pelviens systématiques sont conformes aux normes établies par le Groupe d’étude canadien sur les soins de santé préventifs (GECSSP) et peuvent être adaptées ou adoptées. Méthodologie La méthode SNAP-IT (Smooth National Adaptation and Presentation of Guidelines to Improve Thrombosis Treatment) a servi à déterminer si les lignes directrices de l’ACP étaient conformes aux normes du GECSSP et pouvaient être adaptées ou adoptées. Recommandations Le GECSSP recommande de ne pas effectuer un examen pelvien de dépistage des cancers non cervicaux, des maladies inflammatoires pelviennes ou d’autres affections gynécologiques chez les femmes asymptomatiques. Il s’agit d’une forte recommandation reposant sur des données probantes de qualité modérée. Conclusion Le GECSSP adopte la recommandation en matière d’examen pelvien de dépistage, comme publiée par l’ACP en 2014.

  2. Segundo Catálogo Estelar del Hemisferio Sur con Astrolabio Fotoeléctrico PAII

    NASA Astrophysics Data System (ADS)

    Manrique, W. T.; Podestá, R. C.; Alonso, E.; Actis, E. V.; Pacheco, A. M.; Bustos, G.; Lizhi, L.; Zezhi, W.; Fanmiao, Z.; Hongqi, W.; Perdomo, R.

    Recordamos que entre el Observatorio Astronómico ``Félix Aguilar'', el Observatorio Astronómico de Beijing y el Observatorio Astronómico de La Plata, se ha convenido en desarrollar un Proyecto de Investigación conjunto, para la observación sistemática de estrellas en el Hemisferio Sur, con el objeto de la elaboración de un Catálogo Estelar Global utilizando un Astrolabio Fotoeléctrico PAII del Observatorio de Beijing, que ha sido usado con éxito en la República de China. En este trabajo se presenta el Segundo Catálogo Estelar del Hemisferio Sur, derivado de las observaciones realizadas con el PAII instalado en el OAFA, durante el períiodo Febrero de 1992 a Marzo de 1997. En este lapso se han observado mas de 400000 pasajes estelares, obteniéndose las correcciones Δ α y Δ δ de 5241 estrellas del FK4, FK5, FK5 Ext., SRS, CAMC y GC. Las precisiones medias son del orden de ± 3,2 ms en ascensión recta y ±0."057 en declinación. Rango de magnitudes : 2,0 a 11,5 Rango de declinaciones : -3o a -60o Epoca Media : 1994.9 Se analizan los residuos en función de la magnitud y tipo espectral, correcciones de grupo y frecuencia de distribución Δ α y Δ δ.

  3. Etude Bacteriologique sur 30 Mois dans un Service de Brulés

    PubMed Central

    Chaibdraa, A.; Bentakouk, M.C.

    2008-01-01

    Summary Le pronostic des brûlures est souvent tributaire de complications infectieuses. Les objectifs de cette étude préliminaire rétrospective sont une évaluation de la flore microbienne et ses fluctuations selon la durée d'hospitalisation chez les patients du Centre des brûlés adultes de Annaba (Algérie). Ce travail porte sur 633 prélèvements microbiologiques positifs obtenus entre juin 2003 (inauguration du service) et décembre 2005. Selon le site de prélèvement la répartition est: cutané (78%), hémoculture (9%), prélèvement trachéo-bronchique (4%), uroculture (3%), sonde urinaire (3%), cathéter(3%). Les germes isolés sont: les staphylocoques (58%), les Pseudomonas (20%), le Candida albicans (5%), l'Acinetobacter (3%) et les autres germes (14%). Parmi les staphylocoques et les Pseudomonas recensés, respectivement 19% et 11% sont isolés la première semaine, contre 43% et 52% au-delà de 21 jours. Ces résultats confrontés aux données de la littérature confirment la prédominance du staphylocoque et du Pseudomonas. Le risque de contamination à partir des techniques invasives de réanimation est commun à toutes les équipes. La prolifération bactérienne est en relation avec la durée d'hospitalisation. Ces constatations doivent nous inciter à tirer bénéfice de l'expérience des autres services, en particulier sur les moyens, accessibles, de prévention de l'infection nosocomiale. PMID:21991102

  4. Volvulus du mesentere sur lipome mesenterique: à propos d’un cas

    PubMed Central

    Dème, Hamidou; Badji, Nfally; Akpo, Léra Géraud; Touré, Mouhamed Hamine; Draha, Ronald; Niang, Fallou Gallas; Diop, Abdoulaye Dione; Niang, El Hadj

    2016-01-01

    Nous rapportons le cas d'une patiente de 7 ans qui a consulté pour une douleur abdominale aigue paroxystique siégeant au niveau de l'épigastre associée à des vomissements sans arrêt des matières et des gaz. L'examen clinique ainsi que le bilan biologique étaient sans particularité. L'échographie abdominale demandée en première intention a montré une masse du flanc et de la fosse iliaque droite échogène, homogène à contours réguliers sans signal vasculaire au Doppler associée à un signe du tourbillon des vaisseaux mésentériques. A la tomodensitométrie cette masse correspondait à une formation lipomateuse, bien limitée, exerçant un effet de masse sur le cœcum avec volvulus du mésentère au contact. La disposition des vaisseaux mésentériques à leur origine était normale. Le diagnostic de volvulus du mésentère sur lipome a été retenu. La prise en charge chirurgicale et l'analyse anatomopathologique de la pièce opératoire a confirmé le diagnostic. Nous allons à travers ce cas clinique revoir l'apport de l'échographie et du scanner dans le diagnostic de volvulus du mésentère. PMID:28250879

  5. Modern carbonate sediments and environments of the LaPaz region, Baja California Sur, Mexico

    SciTech Connect

    Halfar, J.; Ingle, J.C. Jr.; Cruz-Orozco, R.; Godinez-Orta, L.

    1996-12-31

    The Gulf of California represents one of the most productive and unique marginal seas in the world. The mouth of the Gulf captures warm equatorial water while annual wind patterns assure major upwelling of nutrient-rich water leading to a rich marine biota. These conditions have created a wide array of tropical through warm temperate carbonate environments. The most unusual of these environments is located in the La Paz region of Baja California Sur where tropical-subtropical water temperatures and low rainfall have allowed growth of corals, calcareous red algae, and other shelled invertebrates to form a carbonate bank environment. Sampling and mapping transacts in shallow bays north of La Paz and on the adjacent Espiritu Santo island have revealed a full spectrum of subenvironments including mangrove bordered, terrigenous mud dominated coastal zones, which grade into carbonate tidal flats. In addition, single coral heads as well as incipient reef structures constructed by Porites and Pocillopora coral are present in deeper water areas. Coralline red algae, which are increasingly utilized for paleoenvironmental reconstructions, grow in high abundance on coral debris and in soft sediments and turn out to be main contributors to the La Paz carbonates. Analysis of siliciclastic admixtures, grain size and organic carbon content allow a classification of distinct environments. These data are supplemented by an evaluation of benthic foraminiferal zonations and the varying abundance of biogenic constituents. This Baja California Sur carbonate environment holds special relevance for the interpretation of analogous Neogene and Paleogene paleoenvironments marking major paleoclimatic and paleoceanographic events along the Pacific Coast of North America.

  6. Modern carbonate sediments and environments of the LaPaz region, Baja California Sur, Mexico

    SciTech Connect

    Halfar, J.; Ingle, J.C. Jr. ); Cruz-Orozco, R. ); Godinez-Orta, L. )

    1996-01-01

    The Gulf of California represents one of the most productive and unique marginal seas in the world. The mouth of the Gulf captures warm equatorial water while annual wind patterns assure major upwelling of nutrient-rich water leading to a rich marine biota. These conditions have created a wide array of tropical through warm temperate carbonate environments. The most unusual of these environments is located in the La Paz region of Baja California Sur where tropical-subtropical water temperatures and low rainfall have allowed growth of corals, calcareous red algae, and other shelled invertebrates to form a carbonate bank environment. Sampling and mapping transacts in shallow bays north of La Paz and on the adjacent Espiritu Santo island have revealed a full spectrum of subenvironments including mangrove bordered, terrigenous mud dominated coastal zones, which grade into carbonate tidal flats. In addition, single coral heads as well as incipient reef structures constructed by Porites and Pocillopora coral are present in deeper water areas. Coralline red algae, which are increasingly utilized for paleoenvironmental reconstructions, grow in high abundance on coral debris and in soft sediments and turn out to be main contributors to the La Paz carbonates. Analysis of siliciclastic admixtures, grain size and organic carbon content allow a classification of distinct environments. These data are supplemented by an evaluation of benthic foraminiferal zonations and the varying abundance of biogenic constituents. This Baja California Sur carbonate environment holds special relevance for the interpretation of analogous Neogene and Paleogene paleoenvironments marking major paleoclimatic and paleoceanographic events along the Pacific Coast of North America.

  7. A Discussion of Knowledge Based Design

    NASA Technical Reports Server (NTRS)

    Wood, Richard M.; Bauer, Steven X. S.

    1999-01-01

    A discussion of knowledge and Knowledge- Based design as related to the design of aircraft is presented. The paper discusses the perceived problem with existing design studies and introduces the concepts of design and knowledge for a Knowledge- Based design system. A review of several Knowledge-Based design activities is provided. A Virtual Reality, Knowledge-Based system is proposed and reviewed. The feasibility of Virtual Reality to improve the efficiency and effectiveness of aerodynamic and multidisciplinary design, evaluation, and analysis of aircraft through the coupling of virtual reality technology and a Knowledge-Based design system is also reviewed. The final section of the paper discusses future directions for design and the role of Knowledge-Based design.

  8. Conference Discussion of the Nuclear Force

    SciTech Connect

    Franz Gross,Thomas D. Cohen,Evgeny Epelbaum,R. Machleidt

    2010-12-01

    Discussion of the nuclear force, lead by a round table consisting of T. Cohen, E. Epelbaum, R. Machleidt, and F. Gross (chair). After an invited talk by Machleidt, published elsewhere in these proceedings, brief remarks are made by Epelbaum, Cohen, and Gross, followed by discussion from the floor moderated by the chair. The chair asked the round table and the participants to focus on the following issues: (1)What does each approach (chiral effective field theory, large Nc, and relativistic phenomenology) contribute to our knowledge of the nuclear force? Do we need them all? Is any one transcendent? (2) How important for applications (few body, nuclear structure, EMC effect, for example) are precise fits to the NN data below 350 MeV? How precise do these fits have to be? (3) Can we learn anything about nonperturbative QCD from these studies of the nuclear force? The discussion presented here is based on a video recording made at the conference and transcribed afterward.

  9. [Disseminated sporotrichosis - clinical case and discussion].

    PubMed

    Barroso Pereira, João Cláudio; Grijó, Amorita; Ribeiro Machado Pereira, Rosângela; Noel S Oliveira, Andreza; de Andrade, Ana Cláudia; Ferreira, Ana Cláudia M; Corrêa Brant Machado, Christiane; Veiga Coutinho, Débora; Vale Rios, Danilo; Pereira Pires, Bárbara

    2008-01-01

    The authors report a case of a patient with a prior history of alcohol abuse who developed nodules and ulcerated skin lesions on his trunk and lower extremities along the line of the lymphatic draining area. The patient's X-ray showed reticular nodular intersticial infiltrates at the lung bases. There was a positive culture of supraclavicular lymph node for Sporothrix schenckii. After specific treatment using mainly potassium iodide, there was regression of cutaneous lesions and lung infiltrates. The authors present a discussion on the deseases' forms of presentation, highlighting the lung involvement ans further discuss the diagnosis and treatment of sporotrichosis.

  10. Summary discussion: An integrated advanced tokamak reactor

    SciTech Connect

    Sauthoff, N.R.

    1994-12-31

    The tokamak concept improvement workshop addressed a wide range of issues involved in the development of a more attractive tokamak. The agenda for the workshop progressed from a general discussion of the long-range energy context (with the objective being the identification of a set of criteria and ``figures of merit`` for measuring the attractiveness of a tokamak concept) to particular opportunities for the improvement of the tokamak concept. The discussions concluded with a compilation of research program elements leading to an improved tokamak concept.

  11. Literature Discussion as Positioning: Examining Positions in Dialogic Discussions in a Third-Grade Classroom

    ERIC Educational Resources Information Center

    Wee, Jongsun

    2010-01-01

    The purpose of the study is to examine positions of students and a teacher in dialogic discussion. In this study, dialogic discussion was defined with Bakhtin's (1981) dialogism, Nystrand's (1997) explanation of dialogically organized instruction, and Mercer's (1995) explanation of Exploratory Talk. Studies about literature discussion in…

  12. Promoting Discussion in Peer Instruction: Discussion Partner Assignment and Accountability Scoring Mechanisms

    ERIC Educational Resources Information Center

    Chou, Chih-Yueh; Lin, Pin-Hsun

    2015-01-01

    Peer instruction (PI) involves students answering questions and peer discussion learning activities. PI can enhance student performance and engagement in classroom instruction. However, some students do not engage in the discussions. This study proposes two mechanisms, discussion partner assignment and accountability scoring mechanisms, to form…

  13. Comparing Face to Face, Tutor Led Discussion and Online Discussion in the Classroom

    ERIC Educational Resources Information Center

    Ng, Connie S. L.; Cheung, Wing Sum

    2007-01-01

    This study explores the relative effectiveness of in class online discussion and face to face, tutor led discussion in preservice teachers' recall of concepts. Two groups of preservice teachers, who engaged in different discussion modes, were tested two weeks later on how many concepts they could recall. No significant difference in the recall…

  14. Corruptness in Education: A Tentative Discussion

    ERIC Educational Resources Information Center

    Dongping, Yang

    2004-01-01

    With more and more instances of corruptness coming to light in the field of education, corruptness in education has become an intense "hot point" of concern in society. This article is a tentative exploration into this matter. In this article, the author discusses the categories of the corruptness in education that has found widespread…

  15. Alice, Greenfoot, and Scratch--A Discussion

    ERIC Educational Resources Information Center

    Utting, Ian; Cooper, Stephen; Kolling, Michael; Maloney, John; Resnick, Mitchel

    2010-01-01

    This article distills a discussion about the goals, mechanisms, and effects of three environments which aim to support the acquisition and development of computing concepts (problem solving and programming) in pre-University and non-technical students: Alice, Greenfoot, and Scratch. The conversation started in a special session on the topic at the…

  16. [Discussion on logistics management of medical consumables].

    PubMed

    Deng, Sutong; Wang, Miao; Jiang, Xiali

    2011-09-01

    Management of medical consumables is an important part of modern hospital management. In modern medical behavior, drugs and medical devices act directly on the patient, and are important factors affecting the quality of medical practice. With the increasing use of medical materials, based on practical application, this article proposes the management model of medical consumables, and discusses the essence of medical materials logistics management.

  17. Discover Presidential Log Cabins. Teacher's Discussion Guide.

    ERIC Educational Resources Information Center

    National Park Service (Dept. of Interior), Washington, DC.

    Discover Presidential Log Cabins is a set of materials designed to help educate 6-8 grade students about the significance of three log cabin sites occupied by George Washington, Ulysses Grant, Abraham Lincoln, and Theodore Roosevelt. This teacher's discussion guide is intended for use as part of a larger, comprehensive social studies program, and…

  18. NEUROTOXICITY OF TETRACHLOROETHYLENE (PERCHLOROETHYLENE): DISCUSSION PAPER

    EPA Science Inventory

    This paper is a background document for a meeting of neurotoxicity experts to discuss the central nervous system effects of exposure to perchloroethylene (perc). The document reviews the literature on neurological testing of people exposed to perc occupationally in dry cleanin...

  19. 33 CFR 214.6 - Discussion.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... SUPPLIES OF DRINKING WATER § 214.6 Discussion. (a) The amendment provides for furnishing emergency supplies of drinking water. The method of furnishing those supplies is not provided for in the amendment, and... providing emergency supplies of clean drinking water. Sewage treatment and disposal, and other...

  20. 33 CFR 214.6 - Discussion.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... SUPPLIES OF DRINKING WATER § 214.6 Discussion. (a) The amendment provides for furnishing emergency supplies of drinking water. The method of furnishing those supplies is not provided for in the amendment, and... providing emergency supplies of clean drinking water. Sewage treatment and disposal, and other...

  1. 33 CFR 214.6 - Discussion.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... SUPPLIES OF DRINKING WATER § 214.6 Discussion. (a) The amendment provides for furnishing emergency supplies of drinking water. The method of furnishing those supplies is not provided for in the amendment, and... providing emergency supplies of clean drinking water. Sewage treatment and disposal, and other...

  2. 33 CFR 214.6 - Discussion.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... SUPPLIES OF DRINKING WATER § 214.6 Discussion. (a) The amendment provides for furnishing emergency supplies of drinking water. The method of furnishing those supplies is not provided for in the amendment, and... providing emergency supplies of clean drinking water. Sewage treatment and disposal, and other...

  3. Young Scientists Discuss Recent Advances, Future Challenges.

    ERIC Educational Resources Information Center

    Baum, Rudy M.

    1989-01-01

    Discusses a National Academy of Science forum at which a group of outstanding young researchers in astronomy, molecular and developmental biology, physics, chemistry, mathematics, atmospheric science, and materials science met for three days of formal presentations and informal conversations. Provides a short synopsis of major speakers. (MVL)

  4. A Discussion Strategy for an Online Class

    ERIC Educational Resources Information Center

    Reese-Durham, Nancy Faith

    2014-01-01

    As a former teacher of face-to-face classes now assigned to teach only online classes, Nancy Reese Durham found herself challenged to change to accommodate online learners. She was determined to provide an environment in the online class where the high level of discussion she had provided in face-to-face classes could flourish as well. Here she…

  5. Problems of Simultaneous Interpreting of Scientific Discussion.

    ERIC Educational Resources Information Center

    Chachibaia, Nelly

    This article focuses on the problems of simultaneous translation (SI) of scientific discussion at the Conference on Training Translators and Interpreters in the New Millennium, the development of which greatly depends on extralinguistic, external conference conditions. Text linguistics considers text not only as a grammatical unit larger than a…

  6. Theses "Discussion" Sections: A Structural Move Analysis

    ERIC Educational Resources Information Center

    Nodoushan, Mohammad Ali Salmani; Khakbaz, Nafiseh

    2011-01-01

    The current study aimed at finding the probable differences between the move structure of Iranian MA graduates' thesis discussion subgenres and those of their non-Iranian counterparts, on the one hand, and those of journal paper authors, on the other. It also aimed at identifying the moves that are considered obligatory, conventional, or optional…

  7. Unseen Discussions: Artist@Hotmail.Com.

    ERIC Educational Resources Information Center

    Huberman, Anthony

    For the recent exhibition "Greater New York: New Art in New York Now," the Education Department at P.S.1 Contemporary Art Center, a large museum located in the Long Island City section of Queens, New York, organized a unique email-based discussion. The museum set up an e-mail address for most participating artists using the free…

  8. School PE through Internet Discussion Forums

    ERIC Educational Resources Information Center

    Lauritsalo, Kirsti; Sääkslahti, Arja; Rasku-Puttonen, Helena

    2015-01-01

    Background: Physical education is a subject that generates strong feelings and emotions, as can be seen in written accounts of PE experiences. It is also important to listen to students' voices in the research context. Nowadays, students can be listened to in a new way--through the Internet. Various discussion forums on the Internet make it…

  9. Discussion Paper on Digital Copyright Issues.

    ERIC Educational Resources Information Center

    2001

    The Copyright Forum serves as a venue for the discussion of digital copyright issues of interest to Canadian educational institutions, libraries, archives, and museums. The Forum currently comprises 13 national associations. The members of the participating associations are both creators and users of digital intellectual content, and a number of…

  10. 33 CFR 214.6 - Discussion.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... SUPPLIES OF DRINKING WATER § 214.6 Discussion. (a) The amendment provides for furnishing emergency supplies of drinking water. The method of furnishing those supplies is not provided for in the amendment, and... providing emergency supplies of clean drinking water. Sewage treatment and disposal, and other...

  11. Questioning as Facilitating Strategies in Online Discussion

    ERIC Educational Resources Information Center

    Wang, Yu-Mei

    2014-01-01

    Facilitation of online discussions presents a challenge to online learning instructors. Unlike in face-to-face courses, students in online learning do not have physical contacts with instructors. They might view instructors as authoritarian figures and perceive instructor's comments as impersonal. This article details the author's personal…

  12. Using Online Discussion Boards for Senior Internships

    ERIC Educational Resources Information Center

    Hurd, Amy R.; Beggs, Brent A.; Elkins, Daniel J.

    2012-01-01

    Senior internships in parks and recreation are an opportunity to put classroom knowledge to practice. However, this is likely the first time students are in a learning environment without the immediate support of faculty and peers. To alleviate this issue, online discussion boards were used to connect interns who were located across the country.…

  13. What Is Formation? A Conceptual Discussion

    ERIC Educational Resources Information Center

    Sutphen, Molly; de Lange, Thomas

    2015-01-01

    This paper addresses the principles and connotations of the term "formation." In our discussion of formation, we draw on different disciplines in order to widen and deepen our understanding of the concept of formation. We also mirror the formation concept against comparable terms and draw on studies in which it has been applied in…

  14. Panel discussion: The future of IR astronomy

    NASA Technical Reports Server (NTRS)

    Caroff, Lawrence J.

    1995-01-01

    A panel discussion was held on the future of IR astronomy. The chairman gave a brief introduction to current planned programs for NASA and other space agencies, followed by short contributions from the six panel members on a variety of special topics. After that, a short question and answer session was held.

  15. Workplace Mobbing: A Discussion for Librarians

    ERIC Educational Resources Information Center

    Hecker, Thomas E.

    2007-01-01

    Workplace mobbing occurs in libraries but is usually unrecognized and unchecked because the phenomenon has not been described and given a name. This discussion provides the library profession with an overview but also with specific background details to assist with recognizing mobbing and preventing severe harm to employees and organizations.

  16. 5 Practices for Orchestrating Productive Mathematics Discussions

    ERIC Educational Resources Information Center

    Stein, Mary Kay; Smith, Margaret

    2011-01-01

    Learn the 5 practices for facilitating effective inquiry-oriented classrooms: (1) Anticipating what students will do--what strategies they will use--in solving a problem; (2) Monitoring their work as they approach the problem in class; (3) Selecting students whose strategies are worth discussing in class; (4) Sequencing those students'…

  17. How to Facilitate Discussions in History

    ERIC Educational Resources Information Center

    Reisman, Abby

    2017-01-01

    In this article, Abby Reisman offers four instructional practices that educators can use to help students grapple with history's contradictions and engage in meaningful text-based discussions. Reisman details two suggestions that can be used in history classrooms and across the disciplines: orient students to one another and orient students to the…

  18. Dr. von Braun Discusses 'Bottle Suit' Concept

    NASA Technical Reports Server (NTRS)

    1954-01-01

    Dr. Wernher von Braun (center), then Chief of the Guided Missile Development Division at Redstone Arsenal, Alabama, discusses a 'bottle suit' model with Dr. Heinz Haber (left), an expert on aviation medicine, and Willey Ley, a science writer on rocketry and space exploration. The three men were at the Disney studios appearing in the motion picture, entitled 'Man in Space.'

  19. Discussed Issues in Preventive Intervention Programs

    ERIC Educational Resources Information Center

    Ocak, Sakire

    2011-01-01

    The growing number of studies in the field of prevention science and related advancements in evidence based programs leads to some discussions about the fundamental issues such as efficacy, effectiveness, dissemination, adaptation, fidelity and continuity in recent years. In this article it is intended to report the common views of early childhood…

  20. Language and Music as Communication: A Discussion.

    ERIC Educational Resources Information Center

    Brown, Roger; And Others

    1979-01-01

    Roger Brown, Diana Deutsch, Warren Benson, and Ruth Day comment on the similarities and differences between verbal language and music as forms of communication. This discussion occurred at the first session of the National Symposium on the Applications of Psychology to the Teaching and Learning of Music, Ann Arbor. (SJL)

  1. Assessing Participation Skills: Online Discussions with Peers

    ERIC Educational Resources Information Center

    Lai, Karyn

    2012-01-01

    Many tertiary-level courses assess students' participation in tutorial or online discussions. However, in educational and pedagogical research literature, criteria for assessing students' skills in engaging with peers remain unclear. This article describes an online assignment with a set of participation criteria and a method for assessing the…

  2. CapDEM Exercise Gamma: Results and Discussion

    DTIC Science & Technology

    2011-06-01

    internal team’ using CapDEM towards the reality of external groups using the CapDEM approach to address their own problem by themselves. The results...enable and support different internal and external configurations of the classified CEE requires further study, including both technical and security...qu’épreuve et évaluation tout à fait indépendantes, l’Exercice a moins mis l’accent sur une « équipe interne » utilisant l’approche DIGCap et il a plutôt

  3. Evaluation d'impact sur la santé et évaluation d'impact sur l'équité en santé : éventail de pratiques et questions de recherche.

    PubMed

    Villeval, Mélanie; Bidault, Elsa; Lang, Thierry

    2016-09-01

    L'Evaluation d'Impact sur la Santé (EIS) se développe au niveau international et est encore au stade émergent en France. Elle vise à évaluer les effets positifs et négatifs potentiels d'un projet, d'un programme ou d'une politique sur la santé. L'objectif est de produire des recommandations en direction des décideurs, afin d'en maximiser les effets positifs et d'en diminuer les effets négatifs. L'EIS est un moyen particulièrement intéressant d'action sur les déterminants de la santé au-delà des comportements individuels et du système de santé. Les politiques de logement, de transport, de solidarité, économiques, etc. ont, en effet, des impacts souvent non prévus sur la santé. Au-delà des effets sur la santé, l'EIS doit aussi permettre d'apprécier la distribution de ces effets dans la population.Si la préoccupation pour l'équité en santé est centrale dans l'EIS, elle reste cependant difficilement traduite en pratique. Face à cette difficulté, des démarches d'évaluation d'impact ont été développées pour renforcer la prise en compte de l'équité à chaque étape de l'EIS ou « Equity Focused Health Impact Assessment », ou prendre en compte les impacts sur les inégalités de santé de façon spécifique. Ainsi, l'Evaluation de l'Impact sur l'Equité en Santé (EIES) semble, par exemple, particulièrement intéressante pour évaluer l'impact sur les inégalités de projets dans le champ sanitaire.L'EIS et l'EIES posent de nombreuses questions de recherche, notamment autour de la réunion, dans une même démarche, du politique, du citoyen et de l'expert. La participation des populations vulnérables potentiellement affectées par la politique évaluée est une valeur centrale de l'EIS, mais pose des questions d'acceptabilité sociale. La collaboration avec les décideurs politiques est également un enjeu majeur. Les difficultés méthodologiques, notamment de quantification des impacts, peuvent constituer des freins à la promotion

  4. Interactive Workshop Discusses Nonlinear Waves and Chaos

    NASA Astrophysics Data System (ADS)

    Tsurutani, Bruce; Morales, George; Passot, Thierry

    2010-07-01

    Eighth International Nonlinear Wave Workshop; La Jolla, California, 1-5 March 2010; Nonlinear waves and chaos were the focus of a weeklong series of informal and interactive discussions at the Eighth International Nonlinear Wave Workshop (NWW8), held in California. The workshop gathered nonlinear plasma and water wave experts from the United States, France, Czech Republic, Germany, Greece, Holland, India, and Japan. Attendees were from the fields of space, laboratory, and fusion plasma physics, astrophysics, and applied mathematics. Special focus was placed on nonlinear waves and turbulence in the terrestrial environment as well as in the interstellar medium from observational, laboratory, and theoretical perspectives. Discussions covered temperature anisotropies and related instabilities, the properties and origin of the so-called dissipation range, and various coherent structures of electromagnetic as well as electrostatic nature. Reconnection and shocks were also topics of discussion, as were properties of magnetospheric whistler and chorus waves. Examples and analysis techniques for superdiffusion and subdiffusion were identified. On this last topic, a good exchange of ideas and results occurred between a water wave expert and a plasma expert, with the rest of the audience listening intently.

  5. Discussion of long-range weather prediction

    SciTech Connect

    Canavan, G.H.

    1998-09-10

    A group of scientists at Los Alamos have held a series of discussions of the issues in and prospects for improvements in Long-range Weather Predictions Enabled by Proving of the Atmosphere at High Space-Time Resolution. The group contained the requisite skills for a full evaluation, although this report presents only an informal discussion of the main technical issues. The group discussed all aspects of the proposal, which are grouped below into the headings: (1) predictability; (2) sensors and satellites, (3) DIAL and atmospheric sensing; (4) localized transponders; and (5) summary and integration. Briefly, the group agreed that the relative paucity of observations of the state of the atmosphere severely inhibits the accuracy of weather forecasts, and any program that leads to a more dense and uniform observational network is welcome. As shown in Long-range Weather more dense and uniform observational network is welcome. As shown in Long-range Weather Predictions, the pay-back of accurate long-range forecasts should more than justify the expenditure associated with improved observations and forecast models required. The essential step is to show that the needed technologies are available for field test and space qualification.

  6. Developpement d'un compresseur d'hydrogene base sur le cyclage thermique des hydrures metalliques

    NASA Astrophysics Data System (ADS)

    Laurencelle, Francois

    La compression de l'hydrogene est une etape incontournable de son utilisation dans l'industrie actuelle et dans les nouvelles applications energetiques de l'hydrogene (stockage stationnaire et transport). Les compresseurs mecaniques traditionnellement utilises posent plusieurs problemes d'ingenierie, de securite et de maintenance qui pourraient etre contournes en developpant de nouvelles technologies mieux adaptees a l'hydrogene. Dans cette these, notre objectif est de developper d'un compresseur d'hydrogene base sur les hydrures metalliques pouvant etre connecte a la sortie d'un electrolyseur fonctionnant a basse pression et d'ainsi repondre au besoin de productioncompression d'hydrogene decentralisee. La methodologie du projet comprend plusieurs etapes. Premierement, nous faisons la revue bibliographique des projets impliquant des compresseurs a hydrures metalliques. Deuxiemement, a travers des travaux experimentaux, nous recherchons des hydrures permettant une compression efficace entre 20 et 80°C. Les materiaux sont synthetises par fusion a arc electrique et caracterises sur bancs d'essais d'hydrogenation. La structure de certains materiaux est aussi investiguee par rayons X, methode de B.E.T. et microscopie electronique. Troisiemement, un reacteur d'hydrures est concu de maniere a promouvoir des echanges de chaleur rapides et efficaces. Quatriemement, le prototype et son interface de controle sont construits. Cinquiemement, le compresseur est caracterise pour en evaluer les performances en termes de debit et de capacite. Les resultats obtenus sont presentes dans trois articles publies et dans le chapitre 5 de cette these. Le compresseur (article I) est base sur trois hydrures (LaNi 4.8Sn0.2, LaNi5 et MMNi4.7Al0.3 ). Celui-ci permet d'atteindre un debit de compression de 10 a 20 L d'hydrogene par heure et son efficacite est, estimee a ˜5% par rapport a un compresseur adiabatique ideal. Il a ete demontre que l'efficacite pourrait etre augmentee en utilisant un

  7. Croissance epitaxiale de GaAs sur substrats de Ge par epitaxie par faisceaux chimiques

    NASA Astrophysics Data System (ADS)

    Belanger, Simon

    La situation energetique et les enjeux environnementaux auxquels la societe est confrontee entrainent un interet grandissant pour la production d'electricite a partir de l'energie solaire. Parmi les technologies actuellement disponibles, la filiere du photovoltaique a concentrateur solaire (CPV pour concentrator photovoltaics) possede un rendement superieur et mi potentiel interessant a condition que ses couts de production soient competitifs. La methode d'epitaxie par faisceaux chimiques (CBE pour chemical beam epitaxy) possede plusieurs caracteristiques qui la rendent interessante pour la production a grande echelle de cellules photovoltaiques a jonctions multiples a base de semi-conducteurs III-V. Ce type de cellule possede la meilleure efficacite atteinte a ce jour et est utilise sur les satellites et les systemes photovoltaiques a concentrateur solaire (CPV) les plus efficaces. Une des principales forces de la technique CBE se trouve dans son potentiel d'efficacite d'utilisation des materiaux source qui est superieur a celui de la technique d'epitaxie qui est couramment utilisee pour la production a grande echelle de ces cellules. Ce memoire de maitrise presente les travaux effectues dans le but d'evaluer le potentiel de la technique CBE pour realiser la croissance de couches de GaAs sur des substrats de Ge. Cette croissance constitue la premiere etape de fabrication de nombreux modeles de cellules solaires a haute performance decrites plus haut. La realisation de ce projet a necessite le developpement d'un procede de preparation de surface pour les substrats de germanium, la realisation de nombreuses sceances de croissance epitaxiale et la caracterisation des materiaux obtenus par microscopie optique, microscopie a force atomique (AFM), diffraction des rayons-X a haute resolution (HRXRD), microscopie electronique a transmission (TEM), photoluminescence a basse temperature (LTPL) et spectrometrie de masse des ions secondaires (SIMS). Les experiences ont permis

  8. Lignes directrices canadiennes sur la rhinosinusite bactérienne aiguë

    PubMed Central

    Kaplan, Alan

    2014-01-01

    Résumé Objectif Faire un résumé clinique des lignes directrices canadiennes sur la rhinosinusite bactérienne aiguë (RSBA) qui présente des éléments d’intérêt pour les médecins de famille. Source des données Les auteurs des lignes directrices ont effectué une recherche documentaire systématique et ont rédigé des recommandations. Une cote a été donnée à la fois en fonction de la fiabilité des données probantes et de la solidité des recommandations. On a sollicité les commentaires d’experts en la matière venant de l’extérieur, ainsi que l’aval de sociétés médicales canadiennes (Association pour la microbiologie médicale et l’infectiologie Canada, Société canadienne d’allergie et d’immunologie clinique, Société canadienne d’otorhinolaryngologie et de chirurgie cervicofaciale, Association canadienne des médecins d’urgence et Regroupement canadien des médecins de famille en santé respiratoire). Message principal Le diagnostic de la RSBA repose sur la présence de symptômes particuliers et leur durée; l’imagerie ou une culture n’est pas nécessaire dans les cas peu compliqués. Le traitement dépend de la gravité des symptômes, notamment avec des corticostéroïdes intranasaux (CSIN) recommandés comme monothérapie pour les cas de légers à modérés, quoique leurs bienfaits soient modestes. Le recours à des CSIN accompagnés d’antibiotiques est réservé aux patients qui ne répondent pas aux CSIN après 72 heures et comme traitement initial des patients dont les symptômes sont graves. Le choix de l’antibiotique doit tenir compte du pathogène soupçonné, du risque de résistance, des problèmes concomitants et des tendances locales de la résistance aux antimicrobiens. Des thérapies d’appoint comme l’irrigation nasale avec une solution saline sont recommandées. En présence de cas réfractaires au traitement, d’épisodes récurrents et de signes de complications, on devrait demander une

  9. Effets du titane et du niobium sur l'oxydation à 950circC d'aciers ferritiques

    NASA Astrophysics Data System (ADS)

    Issartel, C.; Buscail, H.; Caudron, E.; Cueff, R.; Riffard, F.; El Messki, S.; Karimi, N.; Antoni, L.

    2004-11-01

    Nous avons étudié l'effet du titane et du niobium sur l'oxydation à 950circC d'un acier Fe-Cr chrominoformeur. La DRX in situ montre que le titane semble s'oxyder en formant Cr{2}TiO{5} et TiO{2} qui contribuent à une augmentation de la prise de masse des échantillons. Une partie du titane issu de ces oxydes semble doper la couche de chromine. Sa présence augmente la concentration en lacunes cationiques dans la chromine et augmente donc la diffusion du chrome dans la couche. Nous avons aussi montré que le niobium n'a pas d'influence sur l'oxydation de ce type d'acier à 950circC.

  10. Mise à jour sur l’utilisation clinique de la buprénorphine

    PubMed Central

    Ducharme, Simon; Fraser, Ronald; Gill, Kathryn

    2012-01-01

    Résumé Objectif Examiner les données scientifiques actuelles sur la buprénorphine-naloxone pour le traitement des troubles liés aux opioïdes, en insistant sur le contexte des soins primaires. Qualité des données On a fait une recension dans MEDLINE et la base de données Cochrane des synthèses critiques. Les données probantes sont surtout de niveau I. Message principal La buprénorphine est un agoniste partiel des récepteurs μ des opioïdes et un antagoniste des récepteurs κ des opioïdes ayant une longue demi-vie et un potentiel moins grand que la méthadone d’entraîner un usage abusif. Pour une désintoxication, la buprénorphine est au moins équivalente à la méthadone et supérieure à la clonidine. Comme thérapie de substitution, la buprénorphine est clairement supérieure au placebo. La méthadone comporte de légers avantages en ce qui a trait à la rétention en thérapie, mais une approche par étape en utilisant initialement la buprénorphine-naloxone est aussi efficace. Il est possible, sécuritaire et efficace de recourir à la buprénorphine en milieu de soins primaires. On peut obtenir l’autorisation de prescrire de la buprénorphine après avoir suivi une formation en ligne. Conclusion La buprénorphine est un agent sécuritaire et efficace pour la désintoxication en cas de dépendance aux opioïdes. Elle peut servir d’agent de première intention dans les programmes de thérapie de substitution, en raison de son potentiel plus faible d’usage abusif en comparaison d’autres opioïdes. Son efficacité en milieux de soins primaires en fait un outil thérapeutique utile pour les médecins de famille.

  11. La violence sur les réseaux canadiens de télévision

    PubMed Central

    Paquette, Guy

    2003-01-01

    La question des effets de la violence à la télévision occupe une place très importante dans l’opinion publique depuis les vingt dernières années, et des centaines d’études y ont été consacrées. Plusieurs chercheurs concluent à une influence négative de cette violence sur le comportement. Le public, les diffuseurs et les autorités politiques ont tous endossé l’idée de réduire la quantité totale de violence présentée au petit écran – en particulier dans les émissions accessibles aux enfants. Nous avons analysé un millier d’émissions de fiction présentées entre 1993 et 2001 sur les principaux réseaux généralistes de télévision au Canada : TVA et TQS ainsi que CTV et Global pour les réseaux privés français et anglais, ainsi que Radio-Canada français et anglais pour les réseaux publics. La méthodologie utilisée est l’analyse de contenu classique, où l’acte de violence constitue l’unité d’analyse. Les données recueillies démontrent que la quantité de violence a augmenté régulièrement depuis 1993, malgré la volonté affirmée des télédiffuseurs de présenter une programmation moins violente. C’est le cas du nombre brut d’actes et du nombre d’actes à l’heure, qui est lui aussi en forte croissance. Les réseaux privés véhiculent trois fois plus de violence que les réseaux publics. On constate également qu’une très forte proportion d’actes de violence figure dans des émissions qui commencent avant 21 h, et que de nombreux enfants y sont probablement exposés. Nous signalons finalement la place de plus en plus importante occupée par la violence psychologique. PMID:20020031

  12. Map showing coastal cliff retreat rates along the Big Sur coast, Monterey and San Luis Obispo Counties, California

    USGS Publications Warehouse

    Hapke, Cheryl J.; Green, Krystal R.

    2004-01-01

    The average coastal cliff retreat rate along the Big Sur coast is 18 ? 6 cm/yr as measured over a 52-year time period. The erosion reference features measured as the cliff edge include the well-defined cliff edges common to marine terraces, slight breaks in the slope defining the upper edge of the active lower slope, and the road grade. Cliff erosion and retreat are focused in isolated erosion hotspots that account for most of the calculated average retreat.

  13. Bio-optical profile data report coastal transition zone program, R/V Point Sur, June 15-28, 1987

    NASA Technical Reports Server (NTRS)

    Davis, Curtiss O.; Rhea, W. Joseph

    1990-01-01

    Twenty vertical profiles of the bio-optical properties of the ocean were made during a research cruise on the R/V Point Sur, June 15 to 28, 1987, as part of the Coastal Transition Zone Program off Point Arena, California. Extracted chlorophyll values were also measured at some stations to provide calibration data for the in situ fluorometer. This summary provides investigators with an overview of the data collected. The entire data set is available in digital form.

  14. A discussion of the concept of spirituality.

    PubMed

    Delgado, Cheryl

    2005-04-01

    The purpose of this article is to discuss the concept of spirituality. There is a recognized connection between spirituality and health, and nurse leaders have acknowledged the importance of the spiritual as well as the physical in providing optimal nursing care. Spirituality goes beyond religious or cultural boundaries. Spirituality is characterized by faith, a search for meaning and purpose in life, a sense of connection with others, and a transcendence of self, resulting in a sense of inner peace and well-being. A strong spiritual connection may improve one's sense of satisfaction with life or enable accommodation to disability.

  15. PDII- Additional discussion of the dynamic aperture

    SciTech Connect

    Norman M. Gelfand

    2002-07-23

    This note is in the nature of an addition to the dynamic aperture calculations found in the report on the Proton Driver, FERMILAB-TM-2169. A extensive discussion of the Proton Driver lattice, as well as the nomenclature used to describe it can be found in TM-2169. Basically the proposed lattice is a racetrack design with the two arcs joined by two long straight sections. The straight sections are dispersion free. Tracking studies were undertaken with the objective of computing the dynamic aperture for the lattice and some of the results have been incorporated into TM-2169. This note is a more extensive report of those calculations.

  16. Best Friends’ Discussions of Social Dilemmas

    PubMed Central

    McDonald, Kristina L.; Malti, Tina; Killen, Melanie; Rubin, Kenneth H.

    2013-01-01

    Peer relationships, particularly friendships, have been theorized to contribute to how children and adolescents think about social and moral issues. The current study examined how young adolescent best friends (191 dyads; 53.4% female) reason together about multifaceted social dilemmas and how their reasoning is related to friendship quality. Mutually-recognized friendship dyads were videotaped discussing dilemmas entailing moral, social-conventional and prudential/pragmatic issues. Both dyad members completed a self-report measure of friendship quality. Dyadic data analyses guided by the Actor-Partner Interdependence Model indicated that adolescent and friend's reports of friendship qualities were related to the forms of reasoning used during discussion. Friends who both reported that they could resolve conflicts in a constructive way were more likely to use moral reasoning than friends who reported that their conflict resolution was poor or disagreed on the quality of their conflict resolution. The findings provide evidence for the important role that friendship interaction may play in adolescents’ social and moral development. PMID:23666555

  17. Student decision making in large group discussion

    NASA Astrophysics Data System (ADS)

    Kustusch, Mary Bridget; Ptak, Corey; Sayre, Eleanor C.; Franklin, Scott V.

    2015-04-01

    It is increasingly common in physics classes for students to work together to solve problems and perform laboratory experiments. When students work together, they need to negotiate the roles and decision making within the group. We examine how a large group of students negotiates authority as part of their two week summer College Readiness Program at Rochester Institute of Technology. The program is designed to develop metacognitive skills in first generation and Deaf and hard-of-hearing (DHH) STEM undergraduates through cooperative group work, laboratory experimentation, and explicit reflection exercises. On the first full day of the program, the students collaboratively developed a sign for the word ``metacognition'' for which there is not a sign in American Sign Language. This presentation will focus on three aspects of the ensuing discussion: (1) how the instructor communicated expectations about decision making; (2) how the instructor promoted student-driven decision making rather than instructor-driven policy; and (3) one student's shifts in decision making behavior. We conclude by discussing implications of this research for activity-based physics instruction.

  18. Accelerating Cleanup: Focus on 2006. Discussion draft

    SciTech Connect

    1997-06-01

    This executive summary addresses the activities associated with the National Transuranic (TRU) Program managed by the Carlsbad Area Office (CAO). The CAO programmatically reports to the Assistant Secretary for Environmental Management and receives administrative support through the Albuquerque Operations Office. The mission of the Carlsbad Area Office (CAO) is to protect human health and the environment by opening and operating the Waste Isolation Pilot Plant for site disposal of TRU waste and by establishing an effective system for management of TRU waste from generation to disposal. It includes personnel assigned to the CAO, the Waste Isolation Pilot Plant (WIPP) site operations, and other activities associated with the National TRU Program. The CAO develops and directs implementation of the program, while the DOE Headquarters establishes policy and guidelines. The CAO assesses compliance with the program guidance, as well as the commonality of activities and assumptions among all the sites. Since the development of the February 28, 1997, database used to develop this Discussion Draft, the opening of the WIPP facility for receipt of Contact Handled waste has been delayed from November 1997 to May 1998. This slippage is significant enough to require a change in the milestones and volumes included in the documents to be reviewed by our stakeholders. Changes have been incorporated into this Discussion Draft and its supporting Project Baseline Summaries (PBSs).

  19. Designing a Discussion Environment to Enhance Connectivity and Sustainability in Asynchronous Online Discussion

    ERIC Educational Resources Information Center

    Gao, Fei

    2011-01-01

    Lack of connectivity and sustainability are two common problems in asynchronous online discussions. In this paper, the author proposes that the two problems may have to do with the structure of threaded forums, that is, the design of threaded forums may constrain participants from having well-connected and sustained discussions. A new discussion…

  20. Science in Discussions: An Analysis of the Use of Science Content in Socioscientific Discussions

    ERIC Educational Resources Information Center

    Nielsen, Jan Alexis

    2012-01-01

    This paper presents a normative pragmatics analysis of students' use of science content in eight socioscientific group discussions about human gene therapy. The specific focus of the paper is on the argumentative role that invocations of science had in the dialectics of the discussions. The analysis suggests that science content occasionally…

  1. Student Participation Patterns in Online Discussion: Incorporating Constructivist Discussion into Online Courses

    ERIC Educational Resources Information Center

    Kim, Hoe Kyeung; Bateman, Betzi

    2010-01-01

    The purpose of this article was to explore student participation patterns in online discussion boards related to their characteristics and question types. The characteristics of students enrolled in an online course and the impact of types of discussion questions on student posts were examined. During the 16 weeks of a course, the participation…

  2. More than Words: Investigating the Format of Asynchronous Discussions as Threaded Discussions or Blogs

    ERIC Educational Resources Information Center

    Clarke, Lane W.; Kinne, Lenore

    2012-01-01

    As more courses in teacher education are offered online, it is imperative that we thoughtfully consider how we structure learning activities. This study turned a critical gaze on a common element of online courses--asynchronous discussion. The authors compared two models of discursive interaction--discussion boards versus blogs--to better…

  3. Isostatic gravity map of the Point Sur 30 x 60 quadrangle and adjacent areas, California

    USGS Publications Warehouse

    Watt, J.T.; Morin, R.L.; Langenheim, V.E.

    2011-01-01

    This isostatic residual gravity map is part of a regional effort to investigate the tectonics and water resources of the central Coast Range. This map serves as a basis for modeling the shape of basins and for determining the location and geometry of faults in the area. Local spatial variations in the Earth's gravity field (after removing variations caused by instrument drift, earth-tides, latitude, elevation, terrain, and deep crustal structure), as expressed by the isostatic anomaly, reflect the distribution of densities in the mid- to upper crust, which in turn can be related to rock type. Steep gradients in the isostatic gravity field often indicate lithologic or structural boundaries. Gravity highs reflect the Mesozoic granitic and Franciscan Complex basement rocks that comprise both the northwest-trending Santa Lucia and Gabilan Ranges, whereas gravity lows in Salinas Valley and the offshore basins reflect the thick accumulations of low-density alluvial and marine sediment. Gravity lows also occur where there are thick deposits of low-density Monterey Formation in the hills southeast of Arroyo Seco (>2 km, Marion, 1986). Within the map area, isostatic residual gravity values range from approximately -60 mGal offshore in the northern part of the Sur basin to approximately 22 mGal in the Santa Lucia Range.

  4. The Reality of Neandertal Symbolic Behavior at the Grotte du Renne, Arcy-sur-Cure, France

    PubMed Central

    Caron, François; d'Errico, Francesco; Del Moral, Pierre; Santos, Frédéric; Zilhão, João

    2011-01-01

    Background The question of whether symbolically mediated behavior is exclusive to modern humans or shared with anatomically archaic populations such as the Neandertals is hotly debated. At the Grotte du Renne, Arcy-sur-Cure, France, the Châtelperronian levels contain Neandertal remains and large numbers of personal ornaments, decorated bone tools and colorants, but it has been suggested that this association reflects intrusion of the symbolic artifacts from the overlying Protoaurignacian and/or of the Neandertal remains from the underlying Mousterian. Methodology/Principal Findings We tested these hypotheses against the horizontal and vertical distributions of the various categories of diagnostic finds and statistically assessed the probability that the Châtelperronian levels are of mixed composition. Our results reject that the associations result from large or small scale, localized or generalized post-depositional displacement, and they imply that incomplete sample decontamination is the parsimonious explanation for the stratigraphic anomalies seen in the radiocarbon dating of the sequence. Conclusions/Significance The symbolic artifacts in the Châtelperronian of the Grotte du Renne are indeed Neandertal material culture. PMID:21738702

  5. Uranium-series ages of marine terraces, La Paz Peninsula, Baja California Sur, Mexico

    USGS Publications Warehouse

    Sirkin, L.; Szabo, B. J.; Padilla, G.A.; Pedrin, S.A.; Diaz, E.R.

    1990-01-01

    Uranium-series dating of coral samples from raised marine terrace deposits between 1.5 and 10 m above sea level in the La Paz Peninsula area, Baja California Sur, yielded ages between 123 ka and 138 ka that are in agreement with previously reported results. The stratigraphy and ages of marine units near the El Coyote Arroyo indicate the presence of two high stands of the sea during the last interglacial or oxygen isotope substage 5e at about 140 ka and 123 ka. Accepting 5 m for the sea level during the last interglacial transgression, we calculate average uplift rates for the marine terraces of about ???70 mm/ka and 40 mm/ka. These slow rates of uplift indicate a relative stability of the La Paz peninsula area for the past 140 000 years. In contrast, areas of Baja California affected by major faultf experienced higher rates of uplift. Rockwell et al. (1987) reported vertical uplift rates of 180 to 300 mm/ka at Punta Banda within the Aqua Blanea fault zone in northern Baja California. ?? 1990 Springer-Verlag.

  6. Kinetic development of biofilm on NF membranes at the Méry-sur-Oise plant, France.

    PubMed

    Houari, Ahmed; Seyer, Damien; Kecili, Karima; Heim, Véronique; Martino, Patrick Di

    2013-01-01

    The kinetic formation of biofilms developing on nanofiltration (NF) membranes was studied for 2 years in the water production unit of Méry-sur-Oise, France. New membranes were set up in a pilot train integrated to the plant and autopsied after operation for 7, 80, 475 and 717 days. The biofouling layer was studied by confocal laser scanning microscope after 4',6-diamidino-2-phenyindole dihydrochloride and lectin staining, and by attenuated total reflectance-Fourier transform infrared spectroscopy and rheology experiments. Three stages of biofilm growth were discriminated: (1) the presence of sessile microcolonies embedded in an exopolymeric matrix (after filtration for seven days); (2) membrane coverage expansion through microcolony development and biofilm growth in three dimensions (up to 80 days filtration); and (3) biofilm maturation by densification (after filtration for 80-717 days). Biofilm maturation resulted in total coverage of the membrane surface and matrix residue diversification, development of the polysaccharide network, and the strengthening of matrix cohesion through viscosity and elasticity increases. The wettability and permeability of the fouled NF membranes decreased quickly and continuously throughout the biofilm development process. The longitudinal pressure drop (LPD) increased only after the biofilm reached a quantitative threshold. The decline in membrane permeability may be the result of contributions from many fouling mechanisms but the LPD was more substantially influenced by biofilm development.

  7. The two Coissac's novels : l'Envol and Sur la Lune

    NASA Astrophysics Data System (ADS)

    Villain, Jacques

    2002-01-01

    Coissac wrote two novels with his friend Charles Rouch.: "L'Envol" in 1934 and "Sur la Lune" in 1935. In these books he describes the preparation of the lunar rocket weigthing 3000 tons and powered by solid propellants. This rocket is launched from a base built at the top of a peruvian volcano. The seven men crew (5 french and one american) is sent to the Moon in a 45 tons command module from which two lunar modules can be separated and can descent to the lunar surface. Coissac describes along the trajectory the means to guide and control the rocket. The exploration of the Moon is done with bicycles ans suits. The explorers meet strange animals and strange people living under ground like termites in perfect love and happiness. After having explored the two faces of the Moon, the lunar modules leave the Moon for a docking with the main vehicle waiting on a lunar orbit and the crew comes back to the Earth. The spacecraft lands in the Pacific Ocean. Except the direct flight from Earth to the Moon, the travel to the Moon proposed by Coissac is very similar to that of Apollo but more than thirty years earlier.

  8. Geothermal Exploration Using Remote Sensing in the South of Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Báncora, Cristina; Prol-Ledesma, Rosa María

    2008-05-01

    The area from Ciudad Constitución to Los Cabos in Baja California Sur was studied using a mosaic of four Landsat ETM+images. The main objective was to define favorable areas for utilization and exploitation of geothermal energy. The approach was to spectrally and spatially enhance the images to define characteristics related with geothermal activity, as are the presence of altered rock and main geological structures. The products of hydrothermal alteration are minerals that belong to two main groups: oxides and hydroxyls. Therefore, image processing is necessary to enhance oxides and hydroxyls spectral features and subdue the vegetation spectral characteristics. The band subtraction (4-3, 3-1, 5-7) gave the finest results due to the fact that it is a linear equation that does not cause loss of information when it is stretched. A color composite was done with these three layers and after a detailed visual analysis three areas were point out to be prospective to contain hydrothermal activity.

  9. [Distribution of aquatic and raptor birds in a freshwater artificial pond of Baja California Sur, Mexico].

    PubMed

    Castillo-Guerrero, J A; Carmona, R

    2001-01-01

    We determined the taxonomic composition and spatial-temporal distribution of aquatic and raptor birds in a freshwater artificial pond of El Centenario, Baja California Sur, México, during 24 biweekly censuses (April, 1998 to March, 1999). The pond is particularly attractive for birds because of its variety of food items. A total 25,563 records of 69 species were done, among them the first report of Chlidonias niger and Phalaropus tricolor for the region. Species richness and abundance were determined for the migrant component, mostly Anatidae (16 species and 55.6% of the total abundance) and shorebirds (18 species and 13.3%). The greater number of species and individuals was in C the deepest and more heterogeneous section of the pond. The most important species was Oxyura jamaicensis (30% of the total observed individuals), with highest abundance in the peninsula. The artificial pond presented an atypical and distinct ornithological composition because it is located in an arid region, and acts as a resting site for migrant birds. The site included species that usually live in freshwater and coastal areas, a characteristic reflected in their high richness. It contributes noticeably to the local avian biodiversity.

  10. Relevamiento total del hemisferio sur celeste en la frecuencia de 1420 MHz

    NASA Astrophysics Data System (ADS)

    Bava, J. A.; Colomb, F. R.; Hurrel, E.; Larrarte, J. J.; Sanz, A. J.; Testori, J. C.; Reich, P.; Reich, W.; Wielebinski, R.

    En el presente artículo se describe el relevamiento del cielo en el Hemisferio Sur Celeste en la frecuencia de 1420 MHz para declinaciones δ<= -19o realizado con la Antena II de 30 metros de diámetro del IAR. Este relevamiento posee igual sensibilidad (3xr.m.s=50 mK) que el realizado en el Hemisferio Norte con el radiotelescopio de 25 metros de Stockert de la Universidad de Bonn, operado por el Max-Planck Institute für Radioastronomie ( Reich W., 1982, A&ASS 48, 219; Reich P. and Reich W., 1986, A&ASS 63, 205). Con los datos obtenidos por ambos radiotelescopios se posee una base de datos de todo el cielo en esta frecuencia. En esta publicación presentamos los detalles del sistema receptor, técnicas de observación y reducción de datos, calibración y discusión de los errores en los resultados.

  11. When Marcel Mauss's Essai sur le Don becomes The Gift: variations on the theme of solidarity.

    PubMed

    Bateman, Simone

    2016-12-01

    Since the early 1970s, Marcel Mauss's Essai sur le Don (1923), translated into English as The Gift in 1954, has been a standard reference in the social science and bioethical literature on the use of human body parts and substances for medical and research purposes. At that time, three social scientists-political scientist Richard Titmuss in the United Kingdom and sociologist Renée C. Fox working with historian Judith Swazey in the United States-had the idea of using this concept to highlight the fundamental structure of the biomedical practices they were studying, respectively, blood donation, and hemodialysis and organ transplantation. The fact that these first applications of Mauss's essay should emerge in English- rather than in French-speaking countries raises the question of what the translation of the essay, and notably of the word don as gift, may have to do with this fact. Reading Mauss in translation undoubtedly inspired a seminal approach to interpreting medical and research practices based on bodily giving. This article posits that something may have also been lost: a much broader concept of giving with unquestionable links to the Durkheimian concept of solidarity, which Mauss conceptualizes not only as an obligation but also as a liberty to give.

  12. Avoiding the Theory Trap When Discussing Evolution

    NASA Astrophysics Data System (ADS)

    Morrison, David

    2006-02-01

    Public opinion polls tell us that we are losing the battle to explain the nature of evolution and its central role in science. One problem, I believe, is letting the opponents of evolution frame the discussion to our disadvantage. Framing involves the selective use of language or context to trigger responses, either support or opposition. As a prime example, we undercut our communications efforts with many nonscientists by defending the `theory of evolution.' Theory is the wrong word to use in addressing the public. In the contemporary U.S., theory means a hunch or idea that has not been established by evidence. It is thus no surprise that polls show that nearly three quarters of U.S. people think that ``evolution is commonly referred to as the theory of evolution because it has not yet been proven scientifically.'' Those who advocate adding ``only a theory'' disclaimers in textbooks know that to call evolution a theory is sufficient to undermine its acceptance.

  13. Discussing and managing hematologic germ line variants.

    PubMed

    Kohlmann, Wendy; Schiffman, Joshua D

    2016-12-02

    With the introduction of genomic technologies, more hereditary cancer syndromes with hematologic malignancies are being described. Up to 10% of hematologic malignancies in children and adults may be the result of an underlying inherited genetic risk. Managing these patients with hereditary hematologic malignancies, including familial leukemia, remains a clinical challenge because there is little information about these relatively rare disorders. This article covers some of the issues related to the diagnosis and interpretation of variants associated with hereditary hematologic malignancies, including the importance of an accurate family history in interpreting genetic variants associated with disease. The challenges of screening other family members and offering the most appropriate early malignancy detection is also discussed. We now have a good opportunity to better define hereditary cancer syndromes with associated hematologic malignancies and contribute to clinically effective guidelines.

  14. Discussing and managing hematologic germ line variants.

    PubMed

    Kohlmann, Wendy; Schiffman, Joshua D

    2016-11-24

    With the introduction of genomic technologies, more hereditary cancer syndromes with hematologic malignancies are being described. Up to 10% of hematologic malignancies in children and adults may be the result of an underlying inherited genetic risk. Managing these patients with hereditary hematologic malignancies, including familial leukemia, remains a clinical challenge because there is little information about these relatively rare disorders. This article covers some of the issues related to the diagnosis and interpretation of variants associated with hereditary hematologic malignancies, including the importance of an accurate family history in interpreting genetic variants associated with disease. The challenges of screening other family members and offering the most appropriate early malignancy detection is also discussed. We now have a good opportunity to better define hereditary cancer syndromes with associated hematologic malignancies and contribute to clinically effective guidelines.

  15. Test versus analysis: A discussion of methods

    NASA Technical Reports Server (NTRS)

    Butler, T. G.

    1986-01-01

    Some techniques for comparing structural vibration data determined from test and analysis are discussed. Orthogonality is a general category of one group, correlation is a second, synthesis is a third and matrix improvement is a fourth. Advantages and short-comings of the methods are explored with suggestions as to how they can complement one another. The purpose for comparing vibration data from test and analysis for a given structure is to find out whether each is representing the dynamic properties of the structure in the same way. Specifically, whether: mode shapes are alike; the frequencies of the modes are alike; modes appear in the same frequency sequence; and if they are not alike, how to judge which to believe.

  16. Discussion on ``Teaching the Second Law''

    NASA Astrophysics Data System (ADS)

    Silbey, Robert; Beretta, Gian Paolo; Cengel, Yunus; Foley, Andrew; Gyftopoulos, Elias P.; Hatsopoulos, George N.; Keck, James C.; Lewins, Jeffery; Lior, Noam; Nieuwenhuizen, Theodorus M.; Steinfeld, Jeffrey; von Spakovsky, Michael R.; Wang, Lin-Shu; Zanchini, Enzo

    2008-08-01

    This article reports an open discussion that took place during the Keenan Symposium "Meeting the Entropy Challenge" (held in Cambridge, Massachusetts, on October 5, 2007) following the short presentations—each reported as a separate article in the present volume—by Joseph Smith Jr., Howard Butler, Andrew Foley, Kimberly Hamad-Schifferli, Bernhardt Trout, Jeffery Lewins, Enzo Zanchini, and Michael von Spakovsky. All panelists and the audience were asked to address the following questions • Why is the second law taught in so many different ways? Why so many textbooks on thermodynamics? Why so many schools of thought? • Some say that thermodynamics is limited to equilibrium, others that it extends to nonequilibrium. How is entropy defined for nonequilibrium states?

  17. Transgenerational epigenetic inheritance: an open discussion.

    PubMed

    Nagy, Corina; Turecki, Gustavo

    2015-08-01

    Much controversy surrounds the idea of transgenerational epigenetics. Recent papers argue that epigenetic marks acquired through experience are passed to offspring, but as in much of the field of epigenetics, there is lack of precision in the definitions and perhaps too much eagerness to translate animal research to humans. Here, we review operational definitions of transgenerational inheritance and the processes of epigenetic programing during early development. Subsequently, based on this background, we critically examine some recent findings of studies investigating transgenerational inheritance. Finally, we discuss possible mechanisms that may explain transgenerational inheritance, including transmission of an epigenetic blueprint, which may predispose offspring to specific epigenetic patterning. Taken together, we conclude that presently, the evidence suggesting that acquired epigenetic marks are passed to the subsequent generation remains limited.

  18. Medical humanities: an aid to ethical discussions.

    PubMed Central

    Moore, A R

    1977-01-01

    'The ethical landscape', the title given to part of a course devised by Mr. Moore, is described in full in this paper. The whole course is a new adventure in medical education designed to help students to explore the ethical problems in the practice of medicine. The 'ethical landscape' is seen through discussion based on passages from literature depicting doctors' and patients' dilemmas. As the results summarized in the tables show, the students found the course well worth while, and thought that they had gained a new insight into the problems with which they would be confronted and also into their own personalities and those of their fellow students whom previously they had only known superficially. The Chairman of the course, Mr. Moore, was also subjected to assessment from his students, because on the skill of the Chairman such a course would fail or succeed. PMID:870691

  19. A discussion on >Calendar Lishu Jiazi<.

    NASA Astrophysics Data System (ADS)

    Liu, Ciyuan

    1996-03-01

    Calendar Lishu Jiazi< of the first century BC is the earliest calendar work survival in Chinese history. It was composed of a list which gave sexagesimal date and its fragment of the first day, number of months (12 or 13) and the winter solstice of each year for a 76 year period. The structure and meaning of the text have not been wellknown since it was set up. In this paper, the author analyzed its basic astronomical premises and, then, introduced a mathematical method by which the list was set up. According to the same mathematical logic, the author developed regulations to make the whole calendar: new-moon days, 24 solar terms, leap years and months so that one could get a complete calendar. He discussed its practicability, error and offered a simple way to improve it. He also criticized some principles of the Chinese calendar.

  20. Discussion of medical x ray picture normalization

    NASA Astrophysics Data System (ADS)

    Wang, Dezong; Xiong, Yingen; Cheng, Liping

    1996-01-01

    There is great significance in comparing medical x-ray pictures, which are taken in different periods. For the orthopaedics surgeon comparing the density of bone is one important way of clinical diagnosis. Some persons think that if these orthopaedics pictures are processed by histogram normalization their gray level and pseudo color can be compared directly. But for one picture we know that the gray distribution is different between the original picture and the processed picture. Comparing these pictures is not authentic. In this paper we discuss that subject and describe the basis of histogram normalization. The distribution on original x-ray pictures and processed pictures is provided. The methods to compare different pictures are mentioned.

  1. Use of hypnosis in criminology: discussion paper.

    PubMed Central

    Waxman, D

    1983-01-01

    Memories of events which are unremarkable may pass unrecorded or may fade with the passage of time. In any situation of stress, anxiety may cloud the memory of the incident and in the case of some intensely frightening or humiliating experience such material may not be subject to voluntary conscious recall and may be repressed. A technique for uncovering certain 'forgotten' or repressed memories with the use of hypnosis is described. A similar method has been used in order to retrieve such memories in the investigation of witnesses and victims of serious crime. Nevertheless, various aspects of the overall validity of such a procedure have been called into question and for this reason the results of numerous experiments and the conclusions arrived at in many papers are discussed. It is emphasized that a rigid code of conduct be followed if hypnosis is to be used as an investigatory tool. PMID:6864721

  2. Miles Discusses Experiment With NASA Personnel

    NASA Technical Reports Server (NTRS)

    1972-01-01

    Lexington, Massachusetts high school student, Judith Miles, discusses her proposed Skylab experiment with Keith Demorest (right) and Henry Floyd, both of Marshall Space Flight Center (MSFC). In her experiment, called the 'Web Formation in Zero Gravity', called for spiders to be released into a box and their actions recorded to determine how well they adapt to the absence of gravity. Spiders are known to adapt quickly to other changes in the environment but nothing was known of their ability to adapt to weightlessness. At the same time spiders were weaving webs in Earth orbit, similar spiders were spinning webs in identical boxes on Earth under full gravity conditions. Miles was among the 25 winners of a contest in which some 3,500 high school students proposed experiments for the following year's Skylab Mission. Of the 25 students, 6 did not see their experiments conducted on Skylab because the experiments were not compatible with Skylab hardware and timelines. Of the 19 remaining, 11 experiments required the manufacture of equipment.

  3. Miles Discusses Skylab Experiment With NASA Personnel

    NASA Technical Reports Server (NTRS)

    1972-01-01

    Lexington, Massachusetts high school student, Judith Miles, discusses her proposed Skylab experiment with engineers and scientists during a design review of the experiment equipment. At left is Ron Pavlue of Kennedy Space Flight Center (KSC), holding a box is Keith Demorest of Marshall Space Flight Center (MSFC). Right of Miles is Dr. Raymond Gause, also of MSFC, who is Miles' scientific advisor. In her experiment, called the 'Web Formation in Zero Gravity', spiders were released into a box and their actions recorded to determine how well they adapt to the absence of gravity. Spiders are known to adapt quickly to other changes in the environment but nothing was known of their ability to adapt to weightlessness. At the same time spiders were weaving webs in Earth orbit, similar spiders were spinning webs in identical boxes on Earth under full gravity conditions. Miles was among the 25 winners of a contest in which some 3,500 high school students proposed experiments for the following year's Skylab mission. Of the 25 students, 6 did not see their experiments conducted on Skylab because the experiments were not compatible with Skylab hardware and timelines. Of the 19 remaining, 11 experiments required the manufacture of equipment.

  4. Indigenous healing practice: ayahuasca. Opening a discussion.

    PubMed

    Prue, Robert; Voss, Richard W

    2014-01-01

    This essay frames an invitation to pastoral counselors and pastoral theologians to examine connections and perhaps interactions between themselves and traditional shamanic healers who use ayahuasca in their healing ceremonies. Indigenous people in South America have used ayahuasca for centuries, and the ritual has become common among the mestizo populations in urban areas of the Amazon, particularly as a curing ritual for drug addiction (Dobkin de Rios, 1970; Moir, 1998). Like peyote in the United States (Calabrese, 1997) ayahuasca use amongst the indigenous people of the Amazon is a form of cultural psychiatry. A review of the literature reveals very little commentary or discussion of shamanic practice in Pastoral Counseling (Pastoral Theology). The scant literature identifies an antithetical relationship at best. The current authors wonder about the possibility of to including shamanic practices in the context of pastoral counseling? This essay seeks to provide some basic information about the ritual use of ayahuasca and to offer a rationale for pastoral counselors to engage in a dialogue about its utility.

  5. Discussion on ``Frontiers of the Second Law''

    NASA Astrophysics Data System (ADS)

    Lloyd, Seth; Bejan, Adrian; Bennett, Charles; Beretta, Gian Paolo; Butler, Howard; Gordon, Lyndsay; Grmela, Miroslav; Gyftopoulos, Elias P.; Hatsopoulos, George N.; Jou, David; Kjelstrup, Signe; Lior, Noam; Miller, Sam; Rubi, Miguel; Schneider, Eric D.; Sekulic, Dusan P.; Zhang, Zhuomin

    2008-08-01

    This article reports an open discussion that took place during the Keenan Symposium "Meeting the Entropy Challenge" (held in Cambridge, Massachusetts, on October 4, 2007) following the short presentations—each reported as a separate article in the present volume—by Adrian Bejan, Bjarne Andresen, Miguel Rubi, Signe Kjelstrup, David Jou, Miroslav Grmela, Lyndsay Gordon, and Eric Schneider. All panelists and the audience were asked to address the following questions • Is the second law relevant when we trap single ions, prepare, manipulate and measure single photons, excite single atoms, induce spin echoes, measure quantum entanglement? Is it possible or impossible to build Maxwell demons that beat the second law by exploiting fluctuations? • Is the maximum entropy generation principle capable of unifying nonequilibrium molecular dynamics, chemical kinetics, nonlocal and nonequilibrium rheology, biological systems, natural structures, and cosmological evolution? • Research in quantum computation and quantum information has raised many fundamental questions about the foundations of quantum theory. Are any of these questions related to the second law?

  6. Discussion on ``Foundations of the Second Law''

    NASA Astrophysics Data System (ADS)

    Silbey, Robert; Ao, Ping; Beretta, Gian Paolo; Cengel, Yunus; Foley, Andrew; Freedman, Steven; Graeff, Roderich; Keck, James C.; Lloyd, Seth; Maroney, Owen; Nieuwenhuizen, Theodorus M.; Weissman, Michael

    2008-08-01

    This article reports an open discussion that took place during the Keenan Symposium "Meeting the Entropy Challenge" (held in Cambridge, Massachusetts, on October 4, 2007) following the short presentations—each reported as a separate article in the present volume—by Seth Lloyd, Owen Maroney, Silviu Guiasu, Ping Ao, Jochen Gemmer, Bernard Guy, Gian Paolo Beretta, Speranta Gheorghiu-Svirschevski, and Dorion Sagan. All panelists and the audience were asked to address the following questions • Why is the second law true? Is it an inviolable law of nature? If not, is it possible to develop a perpetual motion machine of the second kind? • Are second law limitations objective or subjective, real or apparent, due to the nature of physical states or the representation and manipulation of information? Is entropy a physical property in the same sense as energy is universally understood to be an intrinsic property of matter? • Does the second law conflict with quantum mechanics? Are the differences between mechanical and thermodynamic descriptions of physical phenomena reconcilable? Does the reversible law of motion of hamiltonian mechanics and quantum mechanics conflict with the empirical observation of irreversible phenomena?

  7. Europe discusses role in future space telescope

    NASA Astrophysics Data System (ADS)

    1998-06-01

    Prof. Roger Bonnet said it was important for Europe to make an informed decision in the next few years on whether to support NASA's proposed New Generation Space Telescope (NGST), a follow-on programme to the Hubble Space Telescope. NGST's observing capabilities will far extend the reach of existing ground or space-based telescopes, providing the opportunity for the first time to look back through eons of time to the very first stars and galaxies in the Universe. With an aperture greater than four metres, NGST could also provide European astronomers with a crucial complement to some of ESA's planned future space projects, like FIRST (the Far InfraRed Submillimetre Telescope) and Planck (a mission to study the cosmic background radiation field). NASA and ESA are already involved in preliminary NGST studies but Europe has yet to make a commitment to support the programme. NASA wants to start formal development in 2003, with a launch currently planned for 2007. This week's conference at Liege in Belgium was the first opportunity for many astronomers to exchange ideas and compare technological notes on a Next Generation Space Telescope. It also provided a forum for representatives of Europe's space industry to discuss the technological challenges presented by such a project. Prof. Bonnet said: "From recent experience it is clear that the best scientific results in astronomy and astrophysics are obtained by coordinated observations in different wavelength ranges. "The joint effort of the European space programme and of the various large European ground observatories currently allows European astronomers to be on the front-line of astrophysics research."He said that ESA - if supported programmatically and financially by its member states - is willing to discuss with NASA a mutually fruitful form of NGST participation. But Prof. Bonnet stressed that for this type of collaboration to be approved it remained crucial that the European share contained both scientific and

  8. Water, food, and population -- a panel discussion.

    PubMed

    1996-01-01

    This paper summarizes a conference panel discussion among parliamentarians and researchers on water and food supplies and population growth in Asia. The Western Samoa legislator urged delegates to be aware of human development that was no more than the promotion of values associated with a market economy. Samoans increased their per capita caloric consumption. The food supply is provided locally, and 90% of exports are food products. Food security would be jeopardized by a fivefold increase in population. Samoan human development indicators were relatively good for a developing country. However, the country was still ranked as a low-income, food-deficit country. The Pakistani delegate explained that Pakistan's agriculture used the largest, continuous irrigation system in the world. However, the system operated inefficiently. There was concern that future high population growth would jeopardize food security. Another barrier was institutional mismanagement of irrigation and reliance on imports for staple items. Agricultural productivity must increase to meet the increased needs of continued population growth. All available land is currently under cultivation. Future strategies will necessitate international cooperation and innovative and environmentally sound technology. Professor Xuan remarked that increased population growth and rising demand, decreased water quality, and changing consumption patterns were a threat to water supplies. Sustainable increases in food production would entail better water management: reforestation to reduce and prevent water runoff, better technological exploitation of rain water, and more efficient use of irrigation systems. Better international financing schemes were needed for support of these policy changes. Professor Ness suggested free markets in water in order to price water at actual rates of consumption. Polluters should pay. Water management was also threatened by global warming.

  9. Modelisation de la diffusion sur les surfaces metalliques: De l'adatome aux processus de croissance

    NASA Astrophysics Data System (ADS)

    Boisvert, Ghyslain

    Cette these est consacree a l'etude des processus de diffusion en surface dans le but ultime de comprendre, et de modeliser, la croissance d'une couche mince. L'importance de bien mai triser la croissance est primordiale compte tenu de son role dans la miniaturisation des circuits electroniques. Nous etudions ici les surface des metaux nobles et de ceux de la fin de la serie de transition. Dans un premier temps, nous nous interessons a la diffusion d'un simple adatome sur une surface metallique. Nous avons, entre autres, mis en evidence l'apparition d'une correlation entre evenements successifs lorsque la temperature est comparable a la barriere de diffusion, i.e., la diffusion ne peut pas etre associee a une marche aleatoire. Nous proposons un modele phenomenologique simple qui reproduit bien les resultats des simulations. Ces calculs nous ont aussi permis de montrer que la diffusion obeit a la loi de Meyer-Neldel. Cette loi stipule que, pour un processus active, le prefacteur augmente exponentiellement avec la barriere. En plus, ce travail permet de clarifier l'origine physique de cette loi. En comparant les resultats dynamiques aux resultats statiques, on se rend compte que la barriere extraite des calculs dynamiques est essentiellement la meme que celle obtenue par une approche statique, beaucoup plus simple. On peut donc obtenir cette barriere a l'aide de methodes plus precises, i.e., ab initio, comme la theorie de la fonctionnelle de la densite, qui sont aussi malheureusement beaucoup plus lourdes. C'est ce que nous avons fait pour plusieurs systemes metalliques. Nos resultats avec cette derniere approche se comparent tres bien aux resultats experimentaux. Nous nous sommes attardes plus longuement a la surface (111) du platine. Cette surface regorge de particularites interessantes, comme la forme d'equilibre non-hexagonale des i lots et deux sites d'adsorption differents pour l'adatome. De plus, des calculs ab initio precedents n'ont pas reussi a confirmer la

  10. A tree-ring reconstruction of past precipitation for Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Díaz, Sara C.; Touchan, Ramzi; Swetnam, Thomas W.

    2001-06-01

    There is great interest in the climatic variability of Baja California and the Sea of Cortes, but long-term information is limited because instrumental climate records begin in the 1940s or 1960s. The first tree-ring chronology of Pinus lagunae was developed from the southern part of the Baja California Peninsula and the chronology is used to reconstruct the history of precipitation variations. A September-July precipitation reconstruction is developed for the period AD 1862-1996 (R=0.71, p<0.0001, n=56, cross-validation=0.68). This reconstruction is used to assess precipitation variability over the past two centuries, including the relationship with ENSO events. The reconstructed precipitation series indicates a long drought period from 1939 to 1958. It also shows that 1983, one of the strongest El Niño events of the 20th century, is the wettest year. El Niño events during the 20th century are associated with above-normal precipitation, whereas La Niña events are characterized by below-normal precipitation. Four of the most extreme wet years occurred in association with these warm events (1905, 1912, 1919 and 1983). Seventy-one percent of La Niña events are characterized by below-normal precipitation. Sixty-two percent of El Niño events are characterized by above-normal precipitation. Tree-ring growth of P. lagunae is most strongly correlated with winter precipitation in Sonora, Sinaloa and southern Baja California Sur. Precipitation data from meteorological stations in northern Baja California do not correlate well with the tree-ring chronology because this zone has a Mediterranean climate, which differs from the rest of northwest Mexico.

  11. Terrain complexity characterization in the eastern coast of Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Martínez Flores, G.; Nava-Sanchez, E. H.; Segovia Zavala, J. A.

    2013-05-01

    Terrain complexity is an important feature for geomorphological analysis and characterization, since it is associated with processes that control the landscape evolution, giving rise to geological formations of varying topographic complexity. In the geometrical sense, the terrain complexity depicts the shape of the landform surface or cross section, such as rugosity, curvature, fractal dimension, slope, aspect, etc. Moreover, the coastline complexity or indentation index has been used as an auxiliary parameter in coastline characterization. Currently, there are a variety of terrain and shoreline complexity indexes, derived from digital elevation models and digital coastlines, respectively, which usually are evaluated and interpreted independently. In this work the evaluation of these indexes was implemented in twenty watersheds of the eastern coast of the Mexican state of Baja California Sur. To evaluate the terrain complexity index, the slope, profile curvature and roughness were computed and weighted. For this purpose the digital elevation model of 30 m resolution, obtained from the National Institute of Statistics and Geography (INEGI) was used. The coastline complexity was assessed based on the variability of angles of coastline segments, as are defined in the Global Self-consistent, Hierarchical, High-resolution Geography Database (GSHHG). Five classes were identified for each index, whose distribution was represented by digital cartography. In general, the gullies have the highest terrain complexity, while the lower values correspond to areas of alluvial fans and other areas of sedimentation close to the shoreline. The spatial distribution of these indexes could be useful to mapping terrain classification and as support to analyze geological and oceanographic processes that influence this region.

  12. Stratigraphy of Pyroclastic Deposits of EL Aguajito Caldera, Baja California Sur, MÉXICO

    NASA Astrophysics Data System (ADS)

    Osorio Ocampo, L. S.; Macias, J. L.; García Sánchez, L.; Pola, A.; Saucedo, R.; Sánchez, J. M.; Avellán, D. R.; Cardona, S.; Reyes-Agustín, G.; Arce, J. L.

    2015-12-01

    El Aguajito caldera is located in the State of Baja California Sur, it comprises an area of 450 km2 and sits within the Santa Rosalía Basin which is controlled by NE-SW extensional structures and the NW-SE Cimarron Fault that transects the caldera structure. The oldest rocks are ~90 Ma granodiorites covered by an Oligocene-Miocene volcano-sedimentary sequence, the Miocene Santa Lucia Formation and La Esperanza basalt. Pliocene volcanism is represented by La Reforma caldera, El Aguajito caldera, and the Tres Vírgenes Volcanic complex. This study focuses on the cartography and stratigraphy of area in order to understand the evolution of the volcanic system. The stratigraphy from base to top consists of a series of shallow marine sediments (fossiliferous sandstones) covered by a thick sequence of ignimbrites and pyroclastic flows interbedded with volcaniclastic deposits (Gloria and El Infierno Formations). On top of these deposits is El Aguajito caldera, it consists of a 2 m thick pumice fallout followed by an ignimbrite with three transitional lithofacies: a ≤30-m thick light-pink pyroclastic flow enriched in pumice at the base that gradually becomes enrich in lithics towards the top with the occurrence of degasing pipes. On top rests a 15 m-thick light-purple ignimbrite slightly welded with fiammes and a sequence of pumiceous pyroclastic flows and fallouts. These deposits have been associate to the caldera formation with a collapse diameter of ~8 km marked by rhyolitic domes exposed along a ring collapse crowned the sequence as well as NW-SE aligned rhyolitic domes parallel to the seashore. This cartography allowed to present a preliminary new geological map with four stratigraphic units recognized so far, that were emplaced under subaerial conditions beginning with a Plinian column followed by the emplacement of El Aguajito ignimbrite with its subsequent caldera collapse and finally the extrusion of resurgent domes.

  13. Simulation de l'accretion de glace sur un obstacle bidimensionnel par la methode des bissectrices et par la modelisation des ruisselets et des gouttes de surface

    NASA Astrophysics Data System (ADS)

    Fortin, Guy

    Le LIMA (Laboratoire International des Materiaux Antigivre) en collaboration avec le CIRA (Italian Aerospace Research Centre) a developpe un logiciel simulant l'accretion de la glace en regimes sec et humide sur un objet bidimensionnel fixe. L'approche utilisee s'appuie sur les travaux de Lozowski pour les bilans energetiques, sur une etude du comportement du film d'eau, des ruisselets et des gouttes de surface pour le calcul des rugosites et des masses d'eau residuelle, ainsi que sur une methode de bissectrice pour l'evolution de la surface de glace. La contribution du CIRA a ete de fournir le logiciel pour le calcul des ecoulements et de la captation. Le bilan energetique base sur la conservation de l'energie est la sommation de la chaleur latente de fusion, d'evaporation et de sublimation, du rechauffement adiabatique et cinetique, et des pertes de chaleur par convection et conduction, ainsi que de l'evolution thermodynamique de l'eau de son etat initial a son etat final. La densite de la glace, qui a un impact important sur la simulation, est calculee a partir d'une correlation empirique developpee avec les cylindres tournants. En se basant sur les travaux de Al-Khalil et Hansman, le comportement des gouttes en regimes sec et humide a ete decrit analytiquement, ce qui a mene a determiner la hauteur maximale que peuvent atteindre les gouttes avant mouvement. Cette hauteur, appelee hauteur de mouvement, permet de determiner l'etat de l'eau sur la surface (film, ruisselets ou gouttes), ainsi que la hauteur des rugosites lorsque l'eau existe sous forme de gouttes ou de ruisselets. La hauteur de mouvement est determinee par l'equilibre entre les forces de cisaillement, induites par les effets aerodynamiques et gravitationnels evalues pour une goutte non deformee, et la force de cisaillement, induite par la tension de surface et la deformation de la goutte. Elle a ete validee en laboratoire et la precision obtenue pour la partie aerodynamique et gravitationnelle est

  14. Effet de l'etat de la surface de l'acier au carbone 300W sur l'entartrage par la gibbsite dans le procede Bayer

    NASA Astrophysics Data System (ADS)

    Gavril, Liliana

    Une etude a ete effectuee sur l'entartrage des surfaces en acier au carbone par la gibbsite dans le procede Bayer. Trois methodes ont ete utilisees afin de determiner le mecanisme de formation du tartre: mesure de la vitesse d'entartrage, etude electrochimique et protection cathodique. Cette etude demontre que le tartre de gibbsite est un tartre de cristallisation et que l'etat physico-chimique de la surface metallique a une influence marquee sur l'entartrage. Ainsi, l'oxyde en surface a ete identifie comme un facteur determinant pour l'entartrage. Les essais electrochimiques ont montre que la couche d'oxyde formee dans les solutions Bayer est un oxyde mixte de fer et d'aluminium. Les essais de protection cathodique a courant constant valident le role determinant joue par l'oxyde sur l'entartrage, puisqu'en empechant l'oxyde de se former, l'entartrage est pratiquement elimine. Le mecanisme d'adherence du tartre a l'acier implique trois etapes, soit l'oxydation du metal, la formation de la goethite/goethite alumineuse sur l'oxyde et finalement, la germination de la gibbsite sur la goethite/goethite alumineuse.

  15. Regulation of myometrial contraction by ATP-sensitive potassium (KATP) channel via activation of SUR2B and Kir 6.2 in mouse

    PubMed Central

    HONG, Seung Hwa; KYEONG, Kyu-Sang; KIM, Chan Hyung; KIM, Young Chul; CHOI, Woong; YOO, Ra Young; KIM, Hun Sik; PARK, Yeon Jin; JI, Il Woon; JEONG, Eun-Hwan; KIM, Hak Soon; XU, Wen-Xie; LEE, Sang Jin

    2016-01-01

    ATP-sensitive potassium (KATP) channels are well characterized in cardiac, pancreatic and many other muscle cells. In the present study, functional expression of the KATP channel was examined in non-pregnant murine longitudinal myometrium. Isometric contraction measurements and Western blot were used. KATP channel openers (KCOs), such as pinacidil, cromakalim, diazoxide and nicorandil, inhibited spontaneous myometrial contractions in a reversible and glibenclamide-sensitive manner. KCOs inhibited oxytocin (OXT)- and prostaglandin F2α (PGF2α)-induced phasic contractions in a glibenclamide-sensitive manner. SUR2B and Kir6.2 were detected by Western blot, whereas SUR1, SUR2A and Kir6.1 were not. These results show that pinacidl, cromakalim, diazoxide and nicorandil-sensitive KATP channels exist in murine myometrium, which are composed of SUR2B and Kir6.2. Based on the modulatory effects of the KATP channel on spontaneous contraction, OXT- and PGF2α-induced contractions, KATP channels seem to play an essential role in murine myometrial motility via activation of SUR2B and Kir6.2. PMID:27086859

  16. Current Discussions Between ESO and Chile

    NASA Astrophysics Data System (ADS)

    1995-04-01

    [Joint Press Release by the Government of the Republic of Chile and the European Southern Observatory. The text is issued simultaneously in Santiago de Chile (in Spanish) and at the ESO Headquarters in Garching (in English).] Today, Tuesday, 18 April 1995, at the ESO Headquarters in Garching (Germany), Mr. Roberto Cifuentes, Plenipotentiary Ambassador representing the Government of the Republic of Chile, and the Director General of the European Southern Observatory, Professor Riccardo Giacconi, have signed a Supplementary, Interpretative and Amending Agreement to the Convention of 6 November 1963 which governs the relations between Chile and this International Organisation. This Agreement which in practice signifies a widening and strengthening of the cooperative relations between the Organisation and the Chilean scientific community will hereafter be submitted for ratification by the National Congress of the Republic of Chile (the Parliament) and by the ESO Council. According to the Agreement signed today, Chilean astronomers will have privileged access within up to 10 percent observing time on all present and future ESO telescopes in Chile. Moreover, ESO accepts to incorporate into its labour regulations for Chilean personnel concepts like freedom of association and collective bargaining. This signing of the Supplementary, Interpretative and Amending Agreement to the original Convention of 1963 follows after months of constructive dialogue between the parties. It constitutes an important step towards a solution of some of the pending points on the current agenda for discussions between the Government of Chile and ESO. Among the issues still pending, ESO has informed the Government of Chile that respect for its immunities by the Chilean State is of vital importance for the continuation of the construction of the world's largest telescope at Paranal, as well as the continued presence of the Organisation in Chile. The Chilean Government, on its side, and concerning

  17. The Second NATO Modelling and Simulation Conference(Deuxieme conference OTAN sur la modelisation et la simulation)

    DTIC Science & Technology

    2001-07-01

    Exercising (CAX) capabilities to support, in particular, the NATO CJTF. d . The Synthetic Environment Data Representation and Interchange Standard...France) : le bureau de coordination des activités OTAN de modélisation et simulation (MSCO). Les activités du NMSG sont entreprises dans le cadre d’un...Ministère de la Défense du Royaume-Uni, conjointement avec la 3ème Conférence Internationale sur les Environnements Synthétiques (ISEC) au Royal

  18. Lambeau Expanse du Cuir Chevelu dans la Couverture des Alopecies Cicatricielles sur Sequelles de Brulures. A Propos d'une Observation

    PubMed Central

    El Mazouz, S.; Hafidi, J.; Fejjal, N.; Mejjati, H.; Cherkab, L.; Gharib, N.; Abbassi, A.

    2010-01-01

    Summary Les séquelles esthétiques des alopécies cicatricielles sur séquelles de brûlures sont responsables de préjudices empêchant parfois la réinsertion sociale du patient, surtout chez les sujets de sexe féminin. Le cuir chevelu permet la réalisation de lambeaux permettant de couvrir ces alopécies. Les Auteurs décrivent le cas d'une jeune patiente victime d'une alopécie cicatricielle sur séquelles de brûlures chez qui ils ont réalisé un lambeau expansé du cuir chevelu et mettent le point sur la prise en charge de ces lésions à travers ce cas clinique et une revue de littérature. PMID:21991195

  19. Prediction de l’Eclatement Tourbillonnaire sur les Ailes Delta d’Avions Militaires (CFD Prediction of Vortex Breakdown on Delta Wings for Military Aircraft)

    DTIC Science & Technology

    2003-03-01

    contrôle spécifiques. Une première étape dans ce genre d’étude est de s’assurer que l’on peut simuler déjà de façon précise l’éclatement...tourbillonnaire sur une aile delta en l’absence de dispositif de contrôle . Dassault Aviation a réalisé des calculs (Euler et Navier-Stokes) sur la configuration...expérience Communication présentée lors du symposium RTO AVT sur «La gestion avancée des écoulements : Partie A – Les écoulements tourbillonnaires et les

  20. Syndrome de Sweet: étude clinique et natomopathologique sur 5 ans

    PubMed Central

    Bouzidi, Hanae; Gallouj, Salim; Amraoui, Nissrine; Mernissi, Fatima Zahra; Harmouch, Taoufiq

    2015-01-01

    Le syndrome de Sweet ou dermatose aiguë fébrile neutrophilique est une maladie inflammatoire rare à expression cutanée prédominante, appartenant au groupe des dermatoses neutrophiliques. Il est caractérisé par le polymorphisme de son expression clinique et la diversité des maladies qui peuvent lui être associées. Le but de ce travail était d’étudier les particularités cliniques, anatomopathologiques, thérapeutiques et évolutives du syndrome de Sweet. Nous rapportons une étude rétrospective et descriptive de 25 cas de syndrome de Sweet observés dans les services de dermatologie et d'anatomie pathologique du centre hospitalier universitaire de Fès sur une période de 5 ans. Notre série était constituée de 5 hommes et de 20 femmes avec un sex-ratio (hommes/femmes) de 0,25. L’âge moyen des patients était de 47 ans avec des extrêmes allant de 11 à 75 ans. Des maladies associées étaient retrouvées chez 17 patients: hémopathies (deux cas), tumeur solide (1cas), maladie chronique de l'intestin (1cas), tuberculose (1 cas), diabète (trois cas) et infections (9 cas). Deux patientes étaient enceintes au moment du diagnostic. Les manifestations cutanées étaient polymorphes avec atteintes muqueuses dans deux cas. Les lésions siégeaient le plus souvent au niveau acral. Histologiquement, le derme était le siège d'un infiltrat dense et diffus riche en polynucléaires neutrophiles dans tous les cas. Une inflammation de la paroi des vaisseaux étaient observées dans trois cas. Le syndrome de Sweet peut être révélateur ou précéder des maladies associées, ce qui impose une surveillance rigoureuse et prolongée. PMID:26185554

  1. Modelling impacts of offshore wind farms on trophic web: the Courseulles-sur-Mer case study

    NASA Astrophysics Data System (ADS)

    Raoux, Aurore; Pezy, Jean-Philippe; Dauvin, Jean-Claude; Tecchio, samuele; Degraer, Steven; Wilhelmsson, Dan; Niquil, Nathalie

    2016-04-01

    The French government is planning the construction of three offshore wind farms in Normandy. These offshore wind farms will integrate into an ecosystem already subject to a growing number of anthropogenic disturbances such as transportation, fishing, sediment deposit, and sediment extraction. The possible effects of this cumulative stressors on ecosystem functioning are still unknown, but they could impact their resilience, making them susceptible to changes from one stable state to another. Understanding the behaviour of these marine coastal complex systems is essential in order to anticipate potential state changes, and to implement conservation actions in a sustainable manner. Currently, there are no global and integrated studies on the effects of construction and exploitation of offshore wind farms. Moreover, approaches are generally focused on the conservation of some species or groups of species. Here, we develop a holistic and integrated view of ecosystem impacts through the use of trophic webs modelling tools. Trophic models describe the interaction between biological compartments at different trophic levels and are based on the quantification of flow of energy and matter in ecosystems. They allow the application of numerical methods for the characterization of emergent properties of the ecosystem, also called Ecological Network Analysis (ENA). These indices have been proposed as ecosystem health indicators as they have been demonstrated to be sensitive to different impacts on marine ecosystems. We present here in detail the strategy for analysing the potential environmental impacts of the construction of the Courseulles-sur-Mer offshore wind farm (Bay of Seine) such as the reef effect through the use of the Ecopath with Ecosim software. Similar Ecopath simulations will be made in the future on the Le Tréport offshore wind farm site. Results will contribute to a better knowledge of the impacts of the offshore wind farms on ecosystems. They also allow to

  2. Geochemistry of a Tertiary sedimentary phosphate deposit: Baja California Sur, Mexico

    USGS Publications Warehouse

    Piper, D.Z.

    1991-01-01

    The San Gregorio Formation in Baja California Sur, a phosphate-enriched sedimentary unit of late Oligocene to early Miocene age, has been analyzed in two areas (La Purisima and San Hilario) for its chemical composition (major oxides, Cu, Cd, Cr, Co, V, and rare-earth elements - REE) and isotopic composition (??18O and ??13C). A detrital and a marine component were determined from major oxides. The detrital component consists of an unaltered volcanic-ash fraction and a terrigenous clay-silt fraction. The marine component, which accumulated initially as biogenic and hydrogenous material, is now present as opal-A, opal-CT, CaCO3, organic matter, and an authigenic phosphate fraction, mostly pelletal and composed of the carbonate-fluorapatite mineral francolite. The minor elements have been partitioned into these components by assuming a constant composition for the two detrital fractions. The composition of the marine component of minor elements can then be interpreted by assuming that the stoichiometry of the original accumulating organic matter was equal to that of modern plankton. The Cu and Cd contents in the marine component of all rocks require that the seawater-derived fractions of these two metals were supplied to the seafloor solely by organic matter. Enrichments of Cr and V at both sites required an additional marine input. On the basis of their geochemistry in the modern ocean, Cr and V could have precipitated, or been adsorbed, onto settling particles from an O2 minimum zone in which the O2 content was low enough to promote denitrification rather than oxygen respiration. An enrichment of the REE, now within the apatite fraction, resulted from their adsorption onto particulates also in the O2 minimum zone and to the dissolution and alteration of biogenic phases (predominantly silica) within the sediment. Co and Fe2O3 show no enrichment above a detrital contribution. The ??18O-values of apatites from the La Purisima site are heavier than those of apatites

  3. Challenges and opportunities for implementing sustainable energy strategies in coastal communities of Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Etcheverry, Jose R.

    This dissertation explores the potential of renewable energy and efficiency strategies to solve the energy challenges faced by the people living in the biosphere reserve of El Vizcaino, which is located in the North Pacific region of the Mexican state of Baja California Sur. This research setting provides a practical analytical milieu to understand better the multiple problems faced by practitioners and agencies trying to implement sustainable energy solutions in Mexico. The thesis starts with a literature review (chapter two) that examines accumulated international experience regarding the development of renewable energy projects as a prelude to identifying the most salient implementation barriers impeding this type of initiatives. Two particularly salient findings from the literature review include the importance of considering gender issues in energy analysis and the value of using participatory research methods. These findings informed fieldwork design and the analytical framework of the dissertation. Chapter three surveys electricity generation as well as residential and commercial electricity use in nine coastal communities located in El Vizcaino. Chapter three summarizes the fieldwork methodology used, which relies on a mix of qualitative and quantitative research methods that aim at enabling a gender-disaggregated analysis to describe more accurately local energy uses, needs, and barriers. Chapter four describes the current plans of the state government, which are focused in expanding one of the state's diesel-powered electricity grids to El Vizcaino. The Chapter also examines the potential for replacing diesel generators with a combination of renewable energy systems and efficiency measures in the coastal communities sampled. Chapter five analyzes strategies to enable the implementation of sustainable energy approaches in El Vizcaino. Chapter five highlights several international examples that could be useful to inform organizational changes at the federal

  4. Le cancer en Mauritanie : résultats sur 10 ans du registre hospitalier de Nouakchott

    PubMed Central

    Baba, Nacer Dine Ould Mohamed; Sauvaget, Catherine

    2013-01-01

    Le fardeau du cancer reste mal connu en Mauritanie. Il n'est basé que sur des extrapolations de l'incidence des cancers des pays avoisinants. Les données du registre de l'hôpital national permettent de décrire les cas avec un diagnostic histologique. Tous les cas de cancers enregistrés par le service d'anatomo-pathologie de l'hôpital national de Nouakchott de 2000 à 2009 ont été analysés. En 10 ans, 3305 prélèvements histologiques ont été analysés (hommes:42%, femmes:58%). Chez l'homme, le cancer le plus fréquemment analysé était le cancer de la peau (218 cas au total, 189 cas en excluant mélanome), suivi de la prostate (203), des cancers digestifs (179, colorectal et ‘sophage), et des lymphomes (151). Chez la femme, un quart des biopsies était des cancers du sein (485), suivi du col utérin (344), de la sphère gynécologique (218, ovaire et corps utérin), et de la peau (114). Les cancers du foie, du poumon ou de la vessie étaient peu fréquents. Ces résultats ne reflètent pas l'incidence ni l'actuel fardeau du cancer en Mauritanie puisque de nombreux patients diagnostiqués avec un cancer ne reçoivent pas d'examen anatomopathologique. Si, comme dans les pays avoisinants du Maroc et du Mali, les cancers du col et du sein sont les pathologies les plus fréquentes chez la femme, la distribution des cancers chez l'homme dans ce registre hospitalier diffère des résultats des registres de population du Maroc et du Mali où les cancers du poumon, du foie, de la prostate et de la vessie dominent. PMID:23785554

  5. Mise à jour sur la vaccination contre l’herpès zoster

    PubMed Central

    Shapiro, Marla; Kvern, Brent; Watson, Peter; Guenther, Lyn; McElhaney, Janet; McGeer, Allison

    2011-01-01

    Résumé Objectif Répondre aux questions fréquentes concernant l’utilisation du nouveau vaccin contre l’herpès zoster (HZ). Sources de l’information Les résultats publiés d’études cliniques et d’autres études, les recommandations du Comité consultatif national de l’immunisation du Canada et de l’Advisory Committee on Immunization Practices des États-Unis; des données ont aussi été obtenues dans la monographie du produit approuvée par Santé Canada sur le vaccin. Principal message L’herpès zoster est causé par la réactivation du virus varicelle-zoster; l’algie post-zostérienne (APZ) est sa complication la plus fréquente et la plus grave. L’incidence de l’APZ après un zona est directement reliée à l’âge, notamment 50 % des personnes affectées de plus de 60 ans qui ont des douleurs persistantes non soulagées. Le vaccin à base de virus vivant contre le HZ réduit l’incidence du zona d’environ 50 % et de 2 tiers l’apparition des APZ. De plus, les symptômes sont atténués et de plus courte durée chez les personnes vaccinées. Le vaccin est contre-indiqué chez de nombreux patients immunodéprimés et pourrait ne pas être efficace chez les patients qui prennent des médicaments antiviraux qui agissent contre le virus HZ. Les médecins devraient être au courant des différentes recommandations touchant ces groupes. Conclusion Le vaccin contre le HZ est une mesure de prévention sécuritaire et efficace pour réduire le fardeau global et la gravité du zona chez les adultes plus âgés. Le vaccin semble rentable lorsqu’il est administré à des adultes de 60 ans et plus.

  6. General enzymatic screens identify three new nucleotidases in Escherichia coli. Biochemical characterization of SurE, YfbR, and YjjG.

    PubMed

    Proudfoot, Michael; Kuznetsova, Ekaterina; Brown, Greg; Rao, Narayana N; Kitagawa, Masanari; Mori, Hirotada; Savchenko, Alexei; Yakunin, Alexander F

    2004-12-24

    To find proteins with nucleotidase activity in Escherichia coli, purified unknown proteins were screened for the presence of phosphatase activity using the general phosphatase substrate p-nitrophenyl phosphate. Proteins exhibiting catalytic activity were then assayed for nucleotidase activity against various nucleotides. These screens identified the presence of nucleotidase activity in three uncharacterized E. coli proteins, SurE, YfbR, and YjjG, that belong to different enzyme superfamilies: SurE-like family, HD domain family (YfbR), and haloacid dehalogenase (HAD)-like superfamily (YjjG). The phosphatase activity of these proteins had a neutral pH optimum (pH 7.0-8.0) and was strictly dependent on the presence of divalent metal cations (SurE: Mn(2+) > Co(2+) > Ni(2+) > Mg(2+); YfbR: Co(2+) > Mn(2+) > Cu(2+); YjjG: Mg(2+) > Mn(2+) > Co(2+)). Further biochemical characterization of SurE revealed that it has a broad substrate specificity and can dephosphorylate various ribo- and deoxyribonucleoside 5'-monophosphates and ribonucleoside 3'-monophosphates with highest affinity to 3'-AMP. SurE also hydrolyzed polyphosphate (exopolyphosphatase activity) with the preference for short-chain-length substrates (P(20-25)). YfbR was strictly specific to deoxyribonucleoside 5'-monophosphates, whereas YjjG showed narrow specificity to 5'-dTMP, 5'-dUMP, and 5'-UMP. The three enzymes also exhibited different sensitivities to inhibition by various nucleoside di- and triphosphates: YfbR was equally sensitive to both di- and triphosphates, SurE was inhibited only by triphosphates, and YjjG was insensitive to these effectors. The differences in their sensitivities to nucleotides and their varied substrate specificities suggest that these enzymes play unique functions in the intracellular nucleotide metabolism in E. coli.

  7. Listening to Strangers: Classroom Discussion in Democratic Education

    ERIC Educational Resources Information Center

    Parker, Walter C.

    2010-01-01

    Background/Context: The literature on classroom discussion often undercuts itself by treating discussion only as an instructional method, confining its role to the instrumental. Although discussion does serve as an effective means to other curricular ends (teaching with discussion), the capable practice of discussion can also be considered a…

  8. Impact of Materials Defects on Engine Structures Integrity (L’Impact des Defauts des Materiaux sur l’Integrite des Structures des Moteurs)

    DTIC Science & Technology

    1993-04-01

    participants ont fait le point des aspects traitement et contr6le des mat~riaux. en mettant I’accent sur les materiaux constitutifs des disques moteur en...adapte. Pour le physicien. un -d~faur’" peut tres bien se resumer A une imperfection de Ia structure rericulaire d’un materiau. En science des materiaux ... materiaux sur l~integrite des structures des moteurs Defence Research Ag~ency Matenials & Structures Department Farnborough. Hants GUt 14 fITD Rovaume-Uni

  9. Geology, petrology and tectonic significance of the Mesozoic Paleoceanic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Moore, T. E.

    The Viscaino Terrane, which is the most outboard terrane of mainland Baja California, can be divided into three principal terranes on the Vizcaino Peninsula. The structurally lowest is the disrupted composite Puerto Nuevo terrane which is represented by metamorphosed blocks in a serpentinite-matrix melange. The Viscaino Norte terrane structurally overlies the Puerto Nuevo terrane along a low-angle contact. To the south, the Vizcaino Sur terrane exposes a sequence consisting of ophiolite, tuffaceous chart and limestone of the San Hipolito Formation of Late Triassic age. Based on the petrologic, geochemical, and stratigraphic characteristics, the ophiolites of the Vizcaino Norte and Vizcaino Sur terranes are interpreted to have been formed in one or more marginal basin island arc systems during the Late Triassic whereas the ophiolitic rocks of the Puerto Nuevo terrane most likely formed at a midocean ridge. The subsequent pre-Upper Jurassic island arc deposits of the terranes are entirely volcanogenic and biogenic and contain no evidence of close proximity to a cratonal source. It is suggested that for as much as 80 my, the terranes were probably not associated with a continental margin as a fringing island arc, but instead represent allochthonous fragments of a paleogeographically complex paleo-Pacific Ocean.

  10. Prevalence of infection with Toxoplasma gondii in landrace and mixed breed pigs slaughtered in Baja California Sur State, Mexico.

    PubMed

    Alvarado-Esquivel, Cosme; Vazquez-Morales, Renata Fabiola; Colado-Romero, Edgar Eusebio; Guzmán-Sánchez, Ramiro; Liesenfeld, Oliver; Dubey, Jitender P

    2015-03-01

    We performed a cross-sectional study to determine the seroprevalence of Toxoplasma gondii infection in 308 domestic pigs slaughtered in La Paz, Baja California Sur State, Mexico using the modified agglutination test (MAT, cut off 1:25). Forty (13%) of the 308 pigs were seropositive with MAT titers of 1:25 in 16, 1:50 in 5, 1:100 in 4, 1:200 in 5, 1:400 in 3, 1:800 in 3, 1:1600 in 2, and 1:3200 in 2. Multivariate analysis of pigs' characteristics showed that seropositivity to T. gondii was negatively associated with mixed breed (OR = 0.02; 95% CI: 0.003-0.26; P = 0.001). Other variables including sex, type of raising, and municipality did not show an association with T. gondii seropositivity by multivariate analysis. The frequency of high antibody titers (≥1:400) was significantly higher (P < 0.001) in Landrace pigs than mixed breed pigs. The seroprevalence of T. gondii infection in pigs for slaughter in Baja California Sur State is low compared with seroprevalences reported in pigs in other Mexican states. Landrace pigs demonstrated higher seroprevalence rates and antibody levels than mixed breed pigs. This is the first report of T. gondii infection in pigs raised in a desert climate.

  11. What Is the Point of Group Discussion in Mathematics?

    ERIC Educational Resources Information Center

    Hoyles, Celia

    1985-01-01

    Implications of using pupil-to-pupil discussion with mathematics classrooms are discussed, with different ways in which such discussion might promote mathematical understanding. A framework for instruction includes the learning of the computer language Logo. (MNS)

  12. Methodologie de conception numerique d'un ventilateur helico-centrifuge basee sur l'emploi du calcul meridien

    NASA Astrophysics Data System (ADS)

    Lallier-Daniels, Dominic

    La conception de ventilateurs est souvent basée sur une méthodologie « essais/erreurs » d'amélioration de géométries existantes ainsi que sur l'expérience de design et les résultats expérimentaux cumulés par les entreprises. Cependant, cette méthodologie peut se révéler coûteuse en cas d'échec; même en cas de succès, des améliorations significatives en performance sont souvent difficiles, voire impossibles à obtenir. Le projet présent propose le développement et la validation d'une méthodologie de conception basée sur l'emploi du calcul méridien pour la conception préliminaire de turbomachines hélico-centrifuges (ou flux-mixte) et l'utilisation du calcul numérique d'écoulement fluides (CFD) pour la conception détaillée. La méthode de calcul méridien à la base du processus de conception proposé est d'abord présentée. Dans un premier temps, le cadre théorique est développé. Le calcul méridien demeurant fondamentalement un processus itératif, le processus de calcul est également présenté, incluant les méthodes numériques de calcul employée pour la résolution des équations fondamentales. Une validation du code méridien écrit dans le cadre du projet de maîtrise face à un algorithme de calcul méridien développé par l'auteur de la méthode ainsi qu'à des résultats de simulation numérique sur un code commercial est également réalisée. La méthodologie de conception de turbomachines développée dans le cadre de l'étude est ensuite présentée sous la forme d'une étude de cas pour un ventilateur hélico-centrifuge basé sur des spécifications fournies par le partenaire industriel Venmar. La méthodologie se divise en trois étapes: le calcul méridien est employé pour le pré-dimensionnement, suivi de simulations 2D de grilles d'aubes pour la conception détaillée des pales et finalement d'une analyse numérique 3D pour la validation et l'optimisation fine de la géométrie. Les résultats de calcul m

  13. Stratigraphy and geochronology of the Comondú Group near Loreto, Baja California sur, Mexico

    NASA Astrophysics Data System (ADS)

    Umhoefer, Paul J.; Dorsey, Rebecca J.; Willsey, Shawn; Mayer, Larry; Renne, Paul

    2001-10-01

    Upper Oligocene to Middle Miocene volcanic and sedimentary rocks in the Loreto region, Baja California Sur, are widely exposed and make up the Comondú Group as redefined here following McFall. The Comondú Group is part of a volcanic arc and forearc basin that formed along the northwestern margin of Mexico. Regional to detailed scale mapping, stratigraphic analysis, and geochronology in a 10-20-km-wide and 70-km-long belt from the gulf escarpment to the coast near Loreto reveal three main units in the Comondú Group and a composite thickness of ˜1.5-2 km. (1) The lower clastic unit (˜30-19 Ma) contains 200-300 m of fluvial sandstone and conglomerate with probable local eolian deposits and numerous felsic tuffs and basalt flows that accumulated in a forearc basin. (2) The middle breccia and lava flow unit (˜19-15 Ma) is up to 750 m thick and consists of massive andesite breccia that was deposited as proximal debris flows interbedded with minor andesite lava flows. (3) The upper lava flow and breccia unit (˜15-12 Ma) consists almost entirely of up to ˜600 meters of andesite lava flows a few kilometers west of Loreto that are part of a composite volcano. North and south of Loreto for up to 25 km, the unit is composed of andesite lava flows and massive andesite breccia that formed from thick debris flows near that and other volcanic centers. The three units of the Comondú Group in the Loreto area correlated with the Salto, Pelones, and Ricasón formations of the Bahı´a Concepción area. The lower clastic unit of this study is time equivalent to the marine San Gregorio, El Cien, and Isidro formations on the western and southern Baja California peninsula. The middle and upper units of the Loreto area are the proximal equivalent to the type section of the Comondú Group near the village of Comondú. During deposition of the lower part of the Comondú Group, the arc lay to the east on mainland Mexico in the Sierra Madre Occidental, and then migrated to the

  14. Late Quaternary Faulting along the San Juan de los Planes Fault Zone, Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Busch, M. M.; Coyan, J. A.; Arrowsmith, J.; Maloney, S. J.; Gutierrez, G.; Umhoefer, P. J.

    2007-12-01

    As a result of continued distributed deformation in the Gulf Extensional Province along an oblique-divergent plate margin, active normal faulting is well manifest in southeastern Baja California. By characterizing normal-fault related deformation along the San Juan de los Planes fault zone (SJPFZ) southwest of La Paz, Baja California Sur we contribute to understanding the patterns and rates of faulting along the southwest gulf-margin fault system. The geometry, history, and rate of faulting provide constraints on the relative significance of gulf-margin deformation as compared to axial system deformation. The SJPFZ is a major north-trending structure in the southern Baja margin along which we focused our field efforts. These investigations included: a detailed strip map of the active fault zone, including delineation of active scarp traces and geomorphic surfaces on the hanging wall and footwall; fault scarp profiles; analysis of bedrock structures to better understand how the pattern and rate of strain varied during the development of this fault zone; and a gravity survey across the San Juan de los Planes basin to determine basin geometry and fault behavior. The map covers a N-S swath from the Gulf of California in the north to San Antonio in the south, an area ~45km long and ~1-4km wide. Bedrock along the SJPFZ varies from Cretaceous Las Cruces Granite in the north to Cretaceous Buena Mujer Tonalite in the south and is scarred by shear zones and brittle faults. The active scarp-forming fault juxtaposes bedrock in the footwall against Late Quaternary sandstone-conglomerate. This ~20m wide zone is highly fractured bedrock infused with carbonate. The northern ~12km of the SJPFZ, trending 200°, preserves discontinuous scarps 1-2km long and 1-3m high in Quaternary units. The scarps are separated by stretches of bedrock embayed by hundreds of meters-wide tongues of Quaternary sandstone-conglomerate, implying low Quaternary slip rate. Further south, ~2 km north of the

  15. Mesure et retroaction sur un qubit multi-niveaux en electrodynamique quantique en circuit non lineair

    NASA Astrophysics Data System (ADS)

    Boissonneault, Maxime

    L'electrodynamique quantique en circuit est une architecture prometteuse pour le calcul quantique ainsi que pour etudier l'optique quantique. Dans cette architecture, on couple un ou plusieurs qubits supraconducteurs jouant le role d'atomes a un ou plusieurs resonateurs jouant le role de cavites optiques. Dans cette these, j'etudie l'interaction entre un seul qubit supraconducteur et un seul resonateur, en permettant cependant au qubit d'avoir plus de deux niveaux et au resonateur d'avoir une non-linearite Kerr. Je m'interesse particulierement a la lecture de l'etat du qubit et a son amelioration, a la retroaction du processus de mesure sur le qubit de meme qu'a l'etude des proprietes quantiques du resonateur a l'aide du qubit. J'utilise pour ce faire un modele analytique reduit que je developpe a partir de la description complete du systeme en utilisant principalement des transfprmations unitaires et une elimination adiabatique. J'utilise aussi une librairie de calcul numerique maison permettant de simuler efficacement l'evolution du systeme complet. Je compare les predictions du modele analytique reduit et les resultats de simulations numeriques a des resultats experimentaux obtenus par l'equipe de quantronique du CEASaclay. Ces resultats sont ceux d'une spectroscopie d'un qubit supraconducteur couple a un resonateur non lineaire excite. Dans un regime de faible puissance de spectroscopie le modele reduit predit correctement la position et la largeur de la raie. La position de la raie subit les decalages de Lamb et de Stark, et sa largeur est dominee par un dephasage induit par le processus de mesure. Je montre que, pour les parametres typiques de l'electrodynamique quantique en circuit, un accord quantitatif requiert un modele en reponse non lineaire du champ intra-resonateur, tel que celui developpe. Dans un regime de forte puissance de spectroscopie, des bandes laterales apparaissent et sont causees par les fluctuations quantiques du champ electromagnetique

  16. Lipid Biomarkers for Methanogens in Hypersaline Cyanobacterial Mats for Guerrero Negro, Baja California Sur

    NASA Technical Reports Server (NTRS)

    Jahnke, Linda L.; Embaye, Tsegereda; Summons, Roger E.; Fonda, Mark (Technical Monitor)

    2002-01-01

    Analyses of sediments from the vicinity of active methane seeps have uncovered a particular suite of lipid biomarker patterns that characterize methane consuming archaea and their syntrophic, sulfate reducing partners. These isoprenoid biomarkers, largely identified by their anomalously light carbon isotopic signatures, have been a topic of intense research activity and are recorded in numerous methane-rich environments from Holocene to Cenozoic. This phenomenon has implications for depleted kerogens at 2.7 Ga on early Earth (Hinrichs 2002). In contrast, the lipid biosignatures of methane producing archaea are not readily identified through distinct isotopic labels and have received comparably little attention in analyses of archaea in environmental samples. Indeed, environmental analyses generally detect only free archaeal lipids, not the intact, polar molecules found in the membrane of living organisms. As part of the Ames NAI, the 'Early Microbial Ecosystem Research Group' (EMERG) is working to understand microbial processes in the hypersaline cyanobacterial mats growing in the salt evaporation ponds of the Exportadora de Sal at Guerrero Negro, Baja California Sur, Mexico. The aim of this study was to develop methods by which we could identify the organisms responsible for methane generation in this environment. While the ester-bound fatty acids, hopanoids and wax esters provide a means to identify most of the bacterial components of these mats, the archaea which Ere evidently present through genomic assays and the fact of intense methane production (Hoehler et al. 200l), have not been identified through their corresponding lipid signatures. Archaeal core lipids present a number of analytical challenges. The core lipids of methanogens comprise C20, C40 and sometimes C25 isoprenoid chains, linked through ether bonds to glycerol. As well as archaeal (C20), sn-2- and sn-3-hydroxyarchaeol are associated particularly with methylotrophic methanogens. Recently, we have

  17. Panel Discussion: Creating a Spirit of Inquiry in the Classroom

    ERIC Educational Resources Information Center

    Leh, Sandra Kundrik; Melincavage, Sharon M.

    2012-01-01

    A paucity of published literature exists related to the use of panel discussion as a teaching strategy. This article describes the panel discussion, the underpinnings of constructivism and the use of panel discussion to create a constructivist classroom environment. Details of planning, evaluating, and challenges of a panel discussion are also…

  18. How Do Students Participate in Synchronous and Asynchronous Online Discussions?

    ERIC Educational Resources Information Center

    Davidson-Shivers, Gayle V.; Muilenburg, Lin Y.; Tanner, Erica J.

    2001-01-01

    Investigates how graduate students participated in online discussions over a two-week period to determine the utility of synchronous and asynchronous modes of discussion. Types and amounts of communication statements participants made in chats and threaded discussions were analyzed. Results indicate that both types of discussion are liked and…

  19. Discussion Method Teaching: How to Make It Work.

    ERIC Educational Resources Information Center

    Welty, William M.

    1989-01-01

    The discussion teaching process learned through use of the case method is discussed. A method for leading a discussion in which authority and control remains in the hands of the faculty member and in which content and theory is still imparted by the discussion leader is described. (MLW)

  20. Let's Get Started: Strategies for Initiating Authentic Discussion.

    ERIC Educational Resources Information Center

    Johannessen, Larry R.

    One key issue at the heart of conducting classroom discussions is why teachers are attempting to initiate a discussion and what they can do to initiate effective classroom discussions. This paper considers this issue. The paper first considers two classroom discussions which revolve around a short story, "Only Clowns Passing Through" (Jeanne A.…

  1. Framing Classroom Discussion of Same-Sex Marriage

    ERIC Educational Resources Information Center

    Hand, Michael

    2013-01-01

    Assuming that the issue of same-sex marriage should be discussed in schools, how should the discussion be framed? Michael Hand first distinguishes this question from the related but distinct question of whether discussion on this topic should be steered. He then examines three possible frames for discussion of same-sex marriage: the perfectionist…

  2. Characterizing the Issue: Metaphor and Contemporary Impromptu Discussions of Gender.

    ERIC Educational Resources Information Center

    Preston, C. Thomas, Jr.

    1992-01-01

    Discusses metaphor as a device for effective impromptu speaking. Illustrates how impromptu discussions of the Clarence Thomas versus Anita Hill saga utilized metaphors as perspectives from which to instantaneously organize thought and action or an entire situation. Discusses how to assist students to use metaphor in discussions of contemporary…

  3. Discussing Occupy Wall Street on Twitter: longitudinal network analysis of equality, emotion, and stability of public discussion.

    PubMed

    Wang, Cheng-Jun; Wang, Pian-Pian; Zhu, Jonathan J H

    2013-09-01

    To evaluate the quality of public discussion about social movements on Twitter and to understand the structural features and evolution of longitudinal discussion networks, we analyze tweets about the Occupy Wall Street movement posted over the course of 16 days by investigating the relationship between inequality, emotion, and the stability of online discussion. The results reveal that (1) the discussion is highly unequal for both initiating discussions and receiving conversations; (2) the stability of the discussion is much higher for receivers than for initiators; (3) the inequality of online discussions moderates the stability of online discussions; and (4) on an individual level, there is no significant relationship between emotion and political discussion. The implications help evaluate the quality of public discussion, and to understand the relationship between online discussion and social movements.

  4. Discussing Occupy Wall Street on Twitter: Longitudinal Network Analysis of Equality, Emotion, and Stability of Public Discussion

    PubMed Central

    Wang, Pian-Pian; Zhu, Jonathan J.H.

    2013-01-01

    Abstract To evaluate the quality of public discussion about social movements on Twitter and to understand the structural features and evolution of longitudinal discussion networks, we analyze tweets about the Occupy Wall Street movement posted over the course of 16 days by investigating the relationship between inequality, emotion, and the stability of online discussion. The results reveal that (1) the discussion is highly unequal for both initiating discussions and receiving conversations; (2) the stability of the discussion is much higher for receivers than for initiators; (3) the inequality of online discussions moderates the stability of online discussions; and (4) on an individual level, there is no significant relationship between emotion and political discussion. The implications help evaluate the quality of public discussion, and to understand the relationship between online discussion and social movements. PMID:23656222

  5. Actes des journees de linguistique: Colloque sur la recherche etudiante (Proceedings of the Linguistics Conference: Colloquium on Student Research) (Quebec, Canada, March 18-19, 1988).

    ERIC Educational Resources Information Center

    Lepage, Danielle, Ed.; Dominik, Annette, Ed.

    Presentations by students at a colloquium on student research on the occasion of the 50th anniversary of the University of Laval's Faculty of Letters, March 18-19, 1988, include: "Une enquete sur la qualite du francais ecrit au Quebec"; "Amenagement linguistique et neologie"; "Analyse syntaxique des 'arrets et retours' en…

  6. Phosphorylation-dependent Changes in Nucleotide Binding, Conformation, and Dynamics of the First Nucleotide Binding Domain (NBD1) of the Sulfonylurea Receptor 2B (SUR2B)*

    PubMed Central

    de Araujo, Elvin D.; Alvarez, Claudia P.; López-Alonso, Jorge P.; Sooklal, Clarissa R.; Stagljar, Marijana; Kanelis, Voula

    2015-01-01

    The sulfonylurea receptor 2B (SUR2B) forms the regulatory subunit of ATP-sensitive potassium (KATP) channels in vascular smooth muscle. Phosphorylation of the SUR2B nucleotide binding domains (NBD1 and NBD2) by protein kinase A results in increased channel open probability. Here, we investigate the effects of phosphorylation on the structure and nucleotide binding properties of NBD1. Phosphorylation sites in SUR2B NBD1 are located in an N-terminal tail that is disordered. Nuclear magnetic resonance (NMR) data indicate that phosphorylation of the N-terminal tail affects multiple residues in NBD1, including residues in the NBD2-binding site, and results in altered conformation and dynamics of NBD1. NMR spectra of NBD1 lacking the N-terminal tail, NBD1-ΔN, suggest that phosphorylation disrupts interactions of the N-terminal tail with the core of NBD1, a model supported by dynamic light scattering. Increased nucleotide binding of phosphorylated NBD1 and NBD1-ΔN, compared with non-phosphorylated NBD1, suggests that by disrupting the interaction of the NBD core with the N-terminal tail, phosphorylation also exposes the MgATP-binding site on NBD1. These data provide insights into the molecular basis by which phosphorylation of SUR2B NBD1 activates KATP channels. PMID:26198630

  7. Les effets des interfaces sur les proprietes magnetiques et de transport des multicouches nickel/iron et cobalt/silver

    NASA Astrophysics Data System (ADS)

    Veres, Teodor

    Cette these est consacree a l'etude de l'evolution structurale des proprietes magnetiques et de transport des multicouches Ni/Fe et nanostructures a base de Co et de l'Ag. Dans une premiere partie, essentiellement bibliographique, nous introduisons quelques concepts de base relies aux proprietes magnetiques et de transport des multicouches metalliques. Ensuite, nous presentons une breve description des methodes d'analyse des resultats. La deuxieme partie est consacree a l'etude des proprietes magnetiques et de transport des multicouches ferromagnetiques/ferromagnetiques Ni/Fe. Nous montrerons qu'une interpretation coherente de ces proprietes necessite la prise en consideration des effets des interfaces. Nous nous attacherons a mettre en evidence, a evaluer et a etudier les effets de ces interfaces ainsi que leur evolution, et ce, suite a des traitements thermiques tel que le depot a temperature elevee et l'irradiation ionique. Les analyses correlees de la structure et de la magnetoresistance nous permettront d'emettre des conclusions sur l'influence des couches tampons entre l'interface et le substrat ainsi qu'entre les couches elles-memes sur le comportement magnetique des couches F/F. La troisieme partie est consacree aux systemes a Magneto-Resistance Geante (MRG) a base de Co et Ag. Nous allons etudier l'evolution de la microstructure suite a l'irradiation avec des ions Si+ ayant une energie de 1 MeV, ainsi que les effets de ces changements sur le comportement magnetique. Cette partie debutera par l'analyse des proprietes d'une multicouche hybride, intermediaire entre les multicouches et les materiaux granulaires. Nous analyserons a l'aide des mesures de diffraction, de relaxation superparamagnetique et de magnetoresistance, les evolutions structurales produites par l'irradiation ionique. Nous etablirons des modeles qui nous aideront a interpreter les resultats pour une serie des multicouches qui couvrent un large eventail de differents comportements magnetiques

  8. Profil bactériologique du pied diabétique et son impact sur le choix des antibiotiques

    PubMed Central

    Zemmouri, Adil; Tarchouli, Mohamed; Benbouha, Abdellatif; Lamkinsi, Tarik; Bensghir, Mustapha; Elouennass, Mostafa; Haimeur, Cherqui

    2015-01-01

    Introduction Analyse du profil bactériologique des pieds diabétiques pris en charge à l'hôpital militaire de Rabat et son influence sur l'antibiothérapie de première intention. Méthodes Etude prospective non randomisée étalée sur 18 mois, ayant concerné 105 patients. Après recueil des données et en attente des résultats bactériologiques nos patients ont été divisés en deux groupes: un groupe a été mis sous Amoxicilline + Acide clavulanique + Gentamycine (59 patients) et un groupe sous Ertapénème±Gentamycine (46 patients). Résultats L’étude a regroupé 85 hommes et 20 femmes (sexe ratio = 4.26). L’âge moyen est de 64.4 ans. La gangrène a été observée chez 79% des malades; elle était humide-donc surinfectée en principe- dans 43% des cas. Par ailleurs, 67% des malades ont un chiffre de globules blancs 12000 définissant une infection sévère. L'ostéolyse a été mise en évidence chez 27% de nos patients. Parmi les différentes techniques de prélèvements: 81% ont été profonds dont 21% de biopsie osseuse per opératoire et 14% de prélèvements combinés. 42% de ces prélèvements sont poly microbiens et 21% sont stériles. Les résultats bactériologiques viennent confirmer la prédominance des bactéries aérobies à Gram positif. Le taux de remplacement de l'Ertapénème est de 22% contre un taux de 50% pour l'Amoxiclav. Conclusion L'antibiothérapie ne doit être instaurée qu'en cas d'infection du pied diabétique diagnostiquée sur les critères cliniques établis par les consensus internationaux récents. Le respect des mesures de lutte contre la diffusion de la résistance bactérienne s'avère primordiale. PMID:27386024

  9. Theoretical Investigation of Loads on Buried Structures. Volume I. Results of Discussion.

    DTIC Science & Technology

    1978-08-01

    Normalized Overpressure, h = D/2 in Sand Loading Functions for Underground Cylinders Representation of Underground Iso -impulse Curves Approximate...Underground Iso -impulse Curves (High Impulse Region) Approximate Underground Iso -impulse Curves (Low Impulse Region) Representation of Underground...that is applied to the ground sur- face must be propagated without diminution through the underlying soil medium. Hence, the iso -impulse curves

  10. Sur7 Promotes Plasma Membrane Organization and Is Needed for Resistance to Stressful Conditions and to the Invasive Growth and Virulence of Candida albicans

    PubMed Central

    Douglas, Lois M.; Wang, Hong X.; Keppler-Ross, Sabine; Dean, Neta; Konopka, James B.

    2011-01-01

    ABSTRACT The human fungal pathogen Candida albicans causes lethal systemic infections because of its ability to grow and disseminate in a host. The C. albicans plasma membrane is essential for virulence by acting as a protective barrier and through its key roles in interfacing with the environment, secretion of virulence factors, morphogenesis, and cell wall synthesis. Difficulties in studying hydrophobic membranes have limited the understanding of how plasma membrane organization contributes to its function and to the actions of antifungal drugs. Therefore, the role of the recently discovered plasma membrane subdomains termed the membrane compartment containing Can1 (MCC) was analyzed by assessing the virulence of a sur7Δ mutant. Sur7 is an integral membrane protein component of the MCC that is needed for proper localization of actin, morphogenesis, cell wall synthesis, and responding to cell wall stress. MCC domains are stable 300-nm-sized punctate patches that associate with a complex of cytoplasmic proteins known as an eisosome. Analysis of virulence-related properties of a sur7Δ mutant revealed defects in intraphagosomal growth in macrophages that correlate with increased sensitivity to oxidation and copper. The sur7Δ mutant was also strongly defective in pathogenesis in a mouse model of systemic candidiasis. The mutant cells showed a decreased ability to initiate an infection and greatly diminished invasive growth into kidney tissues. These studies on Sur7 demonstrate that the plasma membrane MCC domains are critical for virulence and represent an important new target for the development of novel therapeutic strategies. PMID:22202230

  11. Rupture utérine sur utérus bicorne à 12 semaines d'aménorrhée: à propos d'un cas

    PubMed Central

    Itchimouh, Sanaa; Khabtou, Karima; Mahdaoui, Sakher; Boufettal, Houssine; Samouh, Naima

    2016-01-01

    La fréquence des malformations utérines ayant un impact sur la reproduction est difficile à apprécier. Leur mise en évidence nécessite un bilan spécifique (hystérosalpingographie, hystéroscopie, cœlioscopie). La fertilité spontanée peut être altérée en fonction du type d'anomalie utérine. Toutes ces anomalies peuvent avoir des répercussions sur l’évolution de la conception à type de fausses couches précoces et tardives, de grossesse extra utérine, de menace d'accouchement prématuré, d'accouchement prématuré, de pathologies vasculaires gravidiques et de retard de croissance intra-utérin. L'utérus bicorne est la plus connue des malformations et représente environ la moitié des anomalies de l'utérus. La survenue d'une telle grossesse constitue une situation à risque pouvant entraîner une mort maternelle, mais le diagnostic précoce et un bon suivi peut mener des grossesses à terme sur des utérus malformé. Le dépistage échographique devrait permettre la détection systématique de ce genre de cas afin de prendre préventivement les mesures qui s'imposent. Nous rapportons un cas de rupture utérine sur utérus bicorne unicervical sur grossesse à 12 semaines d'aménorrhée. PMID:27642490

  12. Reconnaissance geologic map of the Loreto and part of the San Janier quadrangles, Baja California Sur, Mexico

    USGS Publications Warehouse

    McLean, Hugh

    1988-01-01

    The Loreto area of Baja California Sur, Mexico, contains a diverse association of igneous, sedimentary, and metasedimentary rocks exposed in the foothills and arroyos between the Sierra La Giganta and Gulf of California. The Loreto area was selected for this study to examine the possible relation of the marine rocks to the opening of the Gulf of California, and to determine the stratigraphic and structural relations between basement rocks composed of granitic and prebatholithic rocks and overlying Tertiary (mainly Miocene) sedimentary and volcanic rocks, and by a sequence of Pliocene marine and nonmarine sedimentary rocks. The Pliocene marine rocks lie in a structural depression informally called here, the Loreto embayment. This geologic map and report stem from a cooperative agreement between the U.S. Geological Survey and the Consejo de Recursos Minerales of Mexico that was initiated in 1982.

  13. Cancer développé sur dilatation kystique de la voie biliaire: à propos d’un cas

    PubMed Central

    Soufi, Mehdi; Lahlou, Mohammed Khalid; Chad, Bouziane

    2014-01-01

    Les auteurs rapportent un cas de dilatation kystique du cholédoque intra- pancréatique découvert chez une femme de 46 ans et compliqué d'un carcinome tubulo-papillaire n'envahissant pas le pancréas. Le traitement a consisté en une duodénopancréatectomie céphalique avec un curage ganglionnaire et anastomose hépatico-jéjunale; la survie était de 30 mois; les auteurs abordent les aspects radiologiques, anatomopathologiques, thérapeutiques et pronostiques de ces cancers développé sur dilatation kystique de la voie biliaire et discutent la place d'une radiothérapie complémentaire de la chirurgie susceptible d'améliorer la survie. PMID:25922635

  14. Perceptions des jeunes victimes de violence sexuelle au sein de leurs relations amoureuses sur leur pire expérience

    PubMed Central

    Van Camp, Tinneke; Hébert, Martine; Fernet, Mylène; Blais, Martin; Lavoie, Francine

    2016-01-01

    Cette étude explore les pires expériences vécues dans les relations amoureuses de jeunes qui ont rapporté avoir vécu de la violence sexuelle dans une relation de couple récente. Quelles sont les situations perçues comme étant les plus difficiles par les jeunes et est-ce que celles-ci se limitent à des incidents violents? Le questionnaire sur les parcours amoureux des jeunes (PAJ) a été complété par des jeunes Québécois âgés de 14 à 18 ans. Au total, plus de 600 participants ont rapporté au moins un épisode de violence sexuelle (souvent en combinaison avec d’autres formes de violence). Nous présentons les résultats de l’analyse qualitative inductive fondée sur une question ouverte concernant la pire expérience vécue. Les observations suggèrent que, en plus des expériences de violence, les difficultés relationnelles, les ruptures amoureuses et les sentiments amoureux non réciproques sont des situations particulièrement difficiles selon les propos des jeunes. Ces différents enjeux vécus par les jeunes devraient être pris en considération dans l’offre de services d’intervention à leur intention. PMID:28191266

  15. Key species and impact of fishery through food web analysis: A case study from Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Rocchi, Marta; Scotti, Marco; Micheli, Fiorenza; Bodini, Antonio

    2017-01-01

    Ecosystem-Based Management (EBM) aims to support the protection of natural ecosystems and to improve economic activities. It requires considering all of the actors interacting in social-ecological systems (e.g., fish and fishers) in the understanding that their interplay determines the dynamic behavior of the single actors as well as that of the system as a whole. Connections are thus central to EBM. Within the ecological dimension of socio-ecological systems, interactions between species define such connections. Understanding how connections affect ecosystem and species dynamics is often impaired by a lack of data. We propose food web network analysis as a tool to help bridge the gap between EBM theory and practice in data-poor contexts, and illustrate this approach through its application to a coastal marine ecosystem in Baja California Sur, Mexico. First, we calculated centrality indices to identify which key (i.e., most central) species must be considered when designing strategies for sustainable resource management. Second, we analyzed the resilience of the system by measuring changes in food web structure due to the local extinction of vulnerable species (i.e., by mimicking the possible effect of excessive fishing pressure). The consequences of species removals were quantified in terms of impacts on global structural indices and species' centrality indices. Overall, we found that this coastal ecosystem shows high resilience to species loss. We identified species (e.g., Octopus sp. and the kelp bass, Paralabrax clathratus) whose protection could further decrease the risk of potential negative impacts of fishing activities on the Baja California Sur food web. This work introduces an approach that can be applied to other ecosystems to aid the implementation of EBM in data-poor contexts.

  16. 29 CFR 780.3 - Exemptions discussed in this part.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... industry are discussed in this part 780. These exemptions differ substantially in their terms, scope, and...) exemption (cotton ginning and sugar processing) discussed in subpart I of this part, and the section...

  17. Teaching Children How to Discuss What They Read.

    ERIC Educational Resources Information Center

    Perez, Samuel A.; Strickland, Eric V.

    1986-01-01

    Explains that teachers must understand that discussion is not a simple collection of listening and speaking skills but a dynamic event that requires children to orchestrate a number of language skills. Offers suggestions for improving discussions. (FL)

  18. Responding and Sharing: Techniques for Energizing Classroom Discussions.

    ERIC Educational Resources Information Center

    Green, Timothy D.

    2000-01-01

    Describes seven techniques that can be used as part of classroom discussions (at elementary, secondary, and university levels in a variety of subjects) to get students actively involved in discussing their ideas with fellow students. (SR)

  19. Handbook on Long Term Defence Planning (Manuel sur la planification de defense a long terme)

    DTIC Science & Technology

    2003-04-01

    Kingdom, SHAPE and Turkey. The team has devised several questionnaires that have been used by NATO and the nations and has held five meetings to discuss...copie papier. Pour de plus amples renseignements concernant l’achat de ces ouvrages , adressez-vous par lettre ou par télécopie à l’adresse indiquée

  20. Le Point sur L'immersion au Canada (The Argument for...Immersion in Canada).

    ERIC Educational Resources Information Center

    Rebuffot, Jacques

    A discussion of French immersion education in Canada begins with a general examination of language immersion, including the historical context and social climate from which the immersion approach has grown in Canada, its beginnings in Quebec and spread throughout Canada, and the status of the approach in the United States, a number of European…

  1. The Framing Discussion: Connecting Student Experience with Mathematical Knowledge

    ERIC Educational Resources Information Center

    Henning, John E.; Balong, Megan

    2011-01-01

    This article introduces the framing discussion, an informal discussion of a mathematical problem that takes place at the beginning of a lesson or unit. The purpose of the framing discussion is to assess student knowledge, motivate student interest, and to serve as a basis for guiding students to more formal mathematical knowledge. The article…

  2. Turning Lurkers into Learners: Increasing Participation in Your Online Discussions

    ERIC Educational Resources Information Center

    Alley, Jason; Greenhaus, Karen

    2007-01-01

    Communication and discussion are keys to student learning and understanding in online environments. With more teachers and K-12 school systems adopting course management tools such as Blackboard and SharePoint, online discussion has become another means of engaging students in curriculum-based learning. Online discussions provide opportunities for…

  3. Watching What We Say: Using Video to Learn about Discussions

    ERIC Educational Resources Information Center

    Basmadjian, Kevin G.

    2008-01-01

    This article considers the benefits and challenges of using English teacher candidates' videotaped discussions of literature as tools to facilitate authentic and engaging discussions of literature. More specifically, this article examines the use of teacher candidates' videotaped discussions in a secondary English methods course to expand…

  4. Discussion and Debate, English, Debate: 5114.117.

    ERIC Educational Resources Information Center

    Wilson, Karen P.

    Developed for a high school quinmester unit on discussion and debate, this guide is designed to help students learn the elements of good discussion and informal debate in a classroom atmosphere emphasizing the democratic process. Performance objective for the course include compiling information for classroom discussions and informal debates,…

  5. Automatic Annotation Method on Learners' Opinions in Case Method Discussion

    ERIC Educational Resources Information Center

    Samejima, Masaki; Hisakane, Daichi; Komoda, Norihisa

    2015-01-01

    Purpose: The purpose of this paper is to annotate an attribute of a problem, a solution or no annotation on learners' opinions automatically for supporting the learners' discussion without a facilitator. The case method aims at discussing problems and solutions in a target case. However, the learners miss discussing some of problems and solutions.…

  6. Panel discussion on laboratory accelerator programs: present and future

    SciTech Connect

    Richter, B.

    1986-09-01

    The present SLAC accelerator program is summarized briefly, and the future of electron-positron colliders is discussed. Present activities discussed include the PEP storage ring, the SPEAR storage ring, the Linear Accelerator, and the SLAC Linear Collider (SLC) project. Future prospects include a larger scale linear collider. The stability requirements on acceleration are briefly discussed. (LEW)

  7. Required Discussion Web Pages in Psychology Courses and Student Outcomes

    ERIC Educational Resources Information Center

    Pettijohn, Terry F., II; Pettijohn, Terry F.

    2007-01-01

    We conducted 2 studies that investigated student outcomes when using discussion Web pages in psychology classes. In Study 1, we assigned 213 students enrolled in Introduction to Psychology courses to either a mandatory or an optional Web page discussion condition. Students used the discussion Web page significantly more often and performed…

  8. Competitive Live Discussion: The Effective Use of Nonverbal Cues.

    ERIC Educational Resources Information Center

    Littlefield, Robert S.

    Verbal and nonverbal dimensions of communication are a vital part of competitive group discussion. Specific nonverbal elements that have been found useful in competitive group discussion include environment, proxemics, kinesics, objectics, and chronemics. For example, equalizing arrangements for the discussion in the best area of a room enhances…

  9. Enhancing Student Involvement and Comprehension through Group and Class Discussions.

    ERIC Educational Resources Information Center

    Finkel, Deborah

    1999-01-01

    Incorporated group and class discussions in two psychology courses to promote critical thinking and interaction among students. Discussion, writing of position papers, and readings from "Opposing Viewpoints" texts were used. Quantitative and qualitative data from student evaluations suggested that the discussions improved interaction, engaged them…

  10. Parents' Plans to Discuss Sexuality with Their Young Children

    ERIC Educational Resources Information Center

    El-Shaieb, Muna; Wurtele, Sandy K.

    2009-01-01

    Two hundred and fourteen (214) parents of young children (M age = 6.75 years) were surveyed about their plans for sexuality discussions with their children. Parents were asked to indicate when they would first discuss sex education with their children for 15 specific topics, how effective they perceived themselves to be at discussing each topic,…

  11. Group Interaction Analysis for Improvement of Classroom Discussion.

    ERIC Educational Resources Information Center

    Perry, Constance M.

    In order to improve the quality of classroom discussion, Group Interaction Analysis (GIA) is suggested as a means of increasing an individual's awareness of the role he assumes in group discussions. GIA is a systemized technique involving the observation of both beneficial and non-beneficial discussion activities. These activities are: (1) fact…

  12. Fostering Knowledge Construction in University Students through Asynchronous Discussion Groups

    ERIC Educational Resources Information Center

    Schellens, Tammy; Valcke, Martin

    2006-01-01

    Does collaborative learning in asynchronous discussion groups result in enhancing academic discourse and knowledge construction? This general research question has been researched in a study involving 300 students, working during six months in 38 electronic discussion groups. The transcripts of the discussions were coded and analysed to test…

  13. Preservice Teachers' Discussion of a Multicultural Young Adult Novel.

    ERIC Educational Resources Information Center

    Bean, Thomas W.; Valerio, Paul Cantu; Mallette, Marla H.; Readence, John E.

    1999-01-01

    Explores preservice elementary teachers' literature-circle discussion of a multicultural young-adult novel with a focus on two research questions: how preservice teachers discuss a multicultural young-adult novel, and what are the views and theories that informed their understanding of literature response discussion. Participants in the discussion…

  14. The Effects of Unstructured Group Discussion on Ethical Judgment

    ERIC Educational Resources Information Center

    Richards, Clinton H.; Alder, G. Stoney

    2014-01-01

    The authors examine the effects of shared information and group discussion on ethical judgment when no structure is imposed on the discussion to encourage ethical considerations. Discussants were asked to identify arguments for and against a variety of business behaviors with ethical implications. A group moderator solicited and recorded arguments…

  15. N-terminal transmembrane domain of SUR1 controls gating of Kir6.2 by modulating channel sensitivity to PIP2.

    PubMed

    Pratt, Emily B; Tewson, Paul; Bruederle, Cathrin E; Skach, William R; Shyng, Show-Ling

    2011-03-01

    Functional integrity of pancreatic adenosine triphosphate (ATP)-sensitive potassium (K(ATP)) channels depends on the interactions between the pore-forming potassium channel subunit Kir6.2 and the regulatory subunit sulfonylurea receptor 1 (SUR1). Previous studies have shown that the N-terminal transmembrane domain of SUR1 (TMD0) interacts with Kir6.2 and is sufficient to confer high intrinsic open probability (P(o)) and bursting patterns of activity observed in full-length K(ATP) channels. However, the nature of TMD0-Kir6.2 interactions that underlie gating modulation is not well understood. Using two previously described disease-causing mutations in TMD0 (R74W and E128K), we performed amino acid substitutions to study the structural roles of these residues in K(ATP) channel function in the context of full-length SUR1 as well as TMD0. Our results revealed that although R74W and E128K in full-length SUR1 both decrease surface channel expression and reduce channel sensitivity to ATP inhibition, they arrive there via distinct mechanisms. Mutation of R74 uniformly reduced TMD0 protein levels, suggesting that R74 is necessary for stability of TMD0. In contrast, E128 mutations retained TMD0 protein levels but reduced functional coupling between TMD0 and Kir6.2 in mini-K(ATP) channels formed by TMD0 and Kir6.2. Importantly, E128K full-length channels, despite having a greatly reduced P(o), exhibit little response to phosphatidylinositol 4,5-bisphosphate (PIP(2)) stimulation. This is reminiscent of Kir6.2 channel behavior in the absence of SUR1 and suggests that TMD0 controls Kir6.2 gating by modulating Kir6.2 interactions with PIP(2). Further supporting this notion, the E128W mutation in full-length channels resulted in channel inactivation that was prevented or reversed by exogenous PIP(2). These results identify a critical determinant in TMD0 that controls Kir6.2 gating by controlling channel sensitivity to PIP(2). Moreover, they uncover a novel mechanism of K

  16. N-terminal transmembrane domain of SUR1 controls gating of Kir6.2 by modulating channel sensitivity to PIP2

    PubMed Central

    Pratt, Emily B.; Tewson, Paul; Bruederle, Cathrin E.; Skach, William R.

    2011-01-01

    Functional integrity of pancreatic adenosine triphosphate (ATP)-sensitive potassium (KATP) channels depends on the interactions between the pore-forming potassium channel subunit Kir6.2 and the regulatory subunit sulfonylurea receptor 1 (SUR1). Previous studies have shown that the N-terminal transmembrane domain of SUR1 (TMD0) interacts with Kir6.2 and is sufficient to confer high intrinsic open probability (Po) and bursting patterns of activity observed in full-length KATP channels. However, the nature of TMD0–Kir6.2 interactions that underlie gating modulation is not well understood. Using two previously described disease-causing mutations in TMD0 (R74W and E128K), we performed amino acid substitutions to study the structural roles of these residues in KATP channel function in the context of full-length SUR1 as well as TMD0. Our results revealed that although R74W and E128K in full-length SUR1 both decrease surface channel expression and reduce channel sensitivity to ATP inhibition, they arrive there via distinct mechanisms. Mutation of R74 uniformly reduced TMD0 protein levels, suggesting that R74 is necessary for stability of TMD0. In contrast, E128 mutations retained TMD0 protein levels but reduced functional coupling between TMD0 and Kir6.2 in mini-KATP channels formed by TMD0 and Kir6.2. Importantly, E128K full-length channels, despite having a greatly reduced Po, exhibit little response to phosphatidylinositol 4,5-bisphosphate (PIP2) stimulation. This is reminiscent of Kir6.2 channel behavior in the absence of SUR1 and suggests that TMD0 controls Kir6.2 gating by modulating Kir6.2 interactions with PIP2. Further supporting this notion, the E128W mutation in full-length channels resulted in channel inactivation that was prevented or reversed by exogenous PIP2. These results identify a critical determinant in TMD0 that controls Kir6.2 gating by controlling channel sensitivity to PIP2. Moreover, they uncover a novel mechanism of KATP channel inactivation

  17. Aircraft Operations on Repaired Runways (L’Exploitation des Aeronefs sur les Pistes Refaites)

    DTIC Science & Technology

    1990-08-01

    required is of great importance since it not discussed with reference to features of the histories of only directly increases nose-gear loading, because of...standard bumps before the nose gear has fully traversed the second repair (as indicated by the time- history of repair height). The initial...penalties which will, it currently seems, make them by reductions in the pneumatic (spring) force or the unpractical especially for smaller aircraft

  18. Ondes de surface transverses sur plaques piézoélectriques avec réseaux de bandes metalliques déposés sur les 2 faces

    NASA Astrophysics Data System (ADS)

    Ballandras, S.; Gavignet, E.; Bigler, E.

    1995-09-01

    A theoretical model has been implemented to study surface transverse waves propagating on piezoelectric plates of finite thickness with thin metal strip gratings on both sides. Calculations have been performed for AT-cuts of quartz of thickness varying from 140 to 120 μm. The spatial period of the gratings was fixed to 20 μm (acoustic wavelength equal to 40 μm). The dispersion curve relating the angular frequency to the wavenumber presents more than one stopband as found in the usual analyses on semi-infinite substrates. These multiple high-frequency stopbands allow to design and realize high stability resonators or highly sensitive sensors for gravimetry, accelerometer applications, etc. Un modèle théorique a été mis en œuvre pour l'étude des propriétés des ondes de surface transverses se propageant sur des plaques piézoélectriques d'épaisseur finie avec des réseaux de fines bandes métalliques déposés sur chaque face. Les calculs ont été effectués pour des plaques de quartz voisines de la coupe AT et d'épaisseur variant de 140 à 120 μm. La périodicité des réseaux en regard a été fixée à 20 μm (longueur d'onde acoustique 40 μm). La courbe de dispersion reliant la pulsation au nombre d'ondes présente plusieurs bandes d'arrêt incluant celle habituellement mise en évidence pour un substrat semi-infini. L'existence de ces multiples bandes d'arrêt haute fréquence ouvre de nouvelles perspectives pour la réalisation de résonateurs ultrastables ou de capteurs de très grande sensibilité gravimétrique, accélérométrique, etc.

  19. Ontology-based topic clustering for online discussion data

    NASA Astrophysics Data System (ADS)

    Wang, Yongheng; Cao, Kening; Zhang, Xiaoming

    2013-03-01

    With the rapid development of online communities, mining and extracting quality knowledge from online discussions becomes very important for the industrial and marketing sector, as well as for e-commerce applications and government. Most of the existing techniques model a discussion as a social network of users represented by a user-based graph without considering the content of the discussion. In this paper we propose a new multilayered mode to analysis online discussions. The user-based and message-based representation is combined in this model. A novel frequent concept sets based clustering method is used to cluster the original online discussion network into topic space. Domain ontology is used to improve the clustering accuracy. Parallel methods are also used to make the algorithms scalable to very large data sets. Our experimental study shows that the model and algorithms are effective when analyzing large scale online discussion data.

  20. Discussing sexuality with patients in a motor neurone disease clinic.

    PubMed

    Marsden, Rachael; Botell, Rachel

    Sexual relationships remain an important aspect of life for people living with motor neurone disease. This article explores the use of the Extended-PLISSIT model when discussing relationships and sexual function with patients and their partners in a motor neurone disease clinic. The model provides a structured approach to assist discussions with patients as well as promoting reflection and exchange of knowledge in the multidisciplinary team. It is a useful model when addressing issues that are sometimes difficult to discuss.

  1. Volvulus gastrique aigu sur éventration diaphragmatique de l'adulte: à propos d'un cas et revue de la littérature

    PubMed Central

    Guèye, Mohamadou Lamine; Touré, Alpha Oumar; Thiam, Ousmane; Seck, Mamadou; Cissé, Mamadou; Kâ, Ousmane; Dieng, Madieng; Touré, Cheikh Tidiane

    2015-01-01

    Le volvulus gastrique aigu sur éventration diaphragmatique est une affection rare et une urgence diagnostique et thérapeutique. Sa présentation clinique est peu spécifique et la tomodensitométrie abdominale permet de confirmer le diagnostic. Nous rapportons le cas d'un patient de 22 ans qui présentaitun syndrome occlusif et une voussure épigastrique. A la radiographie de l'Abdomen Sans Préparation, on notait 2 niveaux hydro-aériques sous la coupole diaphragmatique gauche qui était surélevée. Une dévolvulation et une gastrectomie atypique ont été réalisées devant un volvulus gastrique aigu avec nécrose du fundus mis en évidence à la laparotomie. Les suites opératoires ont été simples. PMID:26161223

  2. Effet de l'interaction coulombienne sur la localisation d'Anderson dans le gaz bidimensionnel d'électrons

    NASA Astrophysics Data System (ADS)

    Fleury, G.

    2010-09-01

    Nous étudions l’effet des interactions coulombiennes sur la localisation d’Anderson dans le gaz bidimensionnel d’électrons désordonné. L’objectif est de statuer sur la question de l’existence de métaux à deux dimensions. En l’absence d’interaction, la théorie d’échelle de la localisation prédit qu’un désordre infinitésimal suffit à localiser la fonction d’onde électronique et donc à rendre le système isolant à température nulle (Abrahams et al., 1979). Dans certaines limites extrêmes, les interactions peuvent être prises en compte et l’on aboutit également à un état isolant. Cependant, aucune théorie analytique ne permet de traiter le régime quantique non-perturbatif où désordre et interaction sont intermédiaires. Expérimentalement, il est possible de l’explorer dans des échantillons de haute mobilité et basse densité. Depuis 1994, des comportements métalliques inexpliqués y ont été observés (Kravchenko et al., 1994). Nous avons mis au point une méthode numérique permettant d’étudier le problème couplé de la localisation d’Anderson en présence d’interaction. Cette méthode mêle Monte Carlo quantique à température nulle et théorie d’échelle pour la conductance de Thouless. Nous trouvons que la théorie d’échelle de la localisation est préservée en présence d’interaction et donc que le gaz bidimensionnel, même corrélé, est isolant à température nulle. Nos résultats montrent de plus que les interactions délocalisent le gaz bidimensionnel et que cet effet de délocalisation est accru en présence de dégénérescence de vallées. Ils nous permettent de proposer un mécanisme simple rendant compte des principales caractéristiques des comportements métalliques observés expérimentalement.

  3. Sur les différentes techniques de validation de la méthode de l'onde thermique

    NASA Astrophysics Data System (ADS)

    Cherifi, A.; Santana, J.

    1993-06-01

    The measurement of space charge location in insulating material is necessary to know phenomenon which are important such as the breakdown. In this article, we show the precision and the reliability of the thermal step method by using some validations. The experimental validation consists in putting, between two insulating slabs of unknow thickness, a plane of charges realized by an aluminium sheet which has been submitted to a high tension before the measure. The experiment holds in the order to determine charges and to deduce the thickness of each slab. We valid the numerical treatments by simulations ; by using a known distribution of charge, we calcul the current; from this current we determine the new distribution of charge which is compared to the first one. We valid also the thermal step method by using two different numerical treatments (by Fourier and by derivation) which are applied to an experimental current. La mesure des charges d'espace dans les isolants synthétiques est une nécessité si l'on veut étendre nos connaissances sur ces matériaux et sur des phénomènes importants tel que le claquage. Dans cet article, nous montrons la précision et la fiabilité de la méthode de l'onde thermique en mettant en valeur un ensemble de validations. La validation expérimentale consiste à placer entre deux plaques isolantes déchargées, d'épaisseurs inconnues, une feuille d'aluminium portée à un potentiel connu avant la mesure. Il s'agit de mesurer ces charges et d'en déduire ainsi les épaisseurs de chaque échantillon. Nous validons les traitements numériques par des simulations. En partant d'une distribution de charge connue, on calcule le courant correspondant, puis on en déduit le champ électrique et la charge d'espace issus de ce courant que l'on compare aux distributions originales. Enfin la comparaison de résultats obtenus à partir d'un courant experimental traité par deux méthodes numériques différentes (par séries de Fourier et par

  4. Restauration fonctionnelle du rachis : effet du niveau initial de douleur sur les performances des sujets lombalgiques chroniques

    PubMed Central

    Caby, Isabelle; Olivier, N; Mendelek, F; Kheir, R Bou; Vanvelcenaher, J; Pelayo, P

    2014-01-01

    HISTORIQUE : La lombalgie chronique est une douleur lombaire persistante d’origine multifactorielle. Le niveau de douleur initial reste faiblement utilisé pour analyser et comparer les réponses des patients lombalgiques au programme de reconditionnement. OBJECTIFS : Apprécier et évaluer les réponses des sujets lombalgiques chroniques très douloureux à une prise en charge dynamique et intensive. MÉTHODOLOGIE : 144 sujets atteints de lombalgie chronique ont été inclus dans un programme de restauration fonctionnelle du rachis de 5 semaines. Les sujets ont été classés en deux groupes de niveau de douleur: un groupe atteint de douleur sévère (n = 28) et un groupe atteint de douleur légère à modérée (n = 106). L’ensemble des sujets ont bénéficié d’une prise en charge identique comprenant principalement de la kinésithérapie, de l’ergothérapie, du reconditionnement musculaire et cardio-vasculaire ainsi qu’un suivi psychologique. Les paramètres physiques (flexibilité, force musculaire) et psychologiques (qualité de vie) ont été mesurés avant (T0) et après le programme (T5sem). RÉSULTATS : L’ensemble des performances physiques et fonctionnelles des sujets très douloureux sont moins bonnes et le retentissement de la lombalgie sur la qualité de vie, pour ces mêmes sujets, est majoré à T0. Toutes les différences significatives constatées à T0 entre les deux groupes s’effacent à T5sem. CONCLUSIONS : Les sujets lombalgiques chroniques très douloureux répondent favorablement au programme dynamique et intensif. L’intensité douloureuse de la lombalgie n’aurait pas d’effet sur les réponses au programme. La restauration fonctionnelle du rachis apporterait aux sujets la possibilité de mieux gérer leur douleur quel que soit son niveau. PMID:25299476

  5. Defence SDI - A Useful Current Awareness System (Dissemination Selective de L’Information sur la Defense: Un Systeme Pratique D’Information Permanente).

    DTIC Science & Technology

    1980-09-01

    would yield: Flight characteristics, Flight clothing, Flight control , etc. Mode 3 - accepts the term only if bounded by blank spaces or punctuation. Mode...authorities. A waiting period must be expected and even then "orders" may be refused and DSIS has no control over these circumstances. The U.S. will...aux usagers accredites 5 de i’information scientifique et technique tuuchint les questions de defense, sous torme de publications r~guiieres portant sur

  6. Ability of a rapid HIV testing site to attract and test vulnerable populations: a cross-sectional study on Actuel sur Rue.

    PubMed

    Engler, Kim; Rollet, Kathleen; Lessard, David; Thomas, Réjean; Lebouché, Bertrand

    2016-10-01

    Quebec's HIV epidemic persists, particularly among men who have sex with men (MSM) and in Montreal. Increasing access to HIV testing is necessary and community-based rapid testing offers one strategy. This paper examines the clienteles and activities of a rapid HIV testing site in Montreal, the pilot project Actuel sur Rue. Comparative analyses were conducted with 1357 MSM, 147 heterosexual men and 64 women who visited Actuel sur Rue between July 2012 and November 2013 on socio-demographics, health, drug use, sexual practices/infection and HIV testing/prevention. Significant group differences were observed in each category. Actuel sur Rue received 1901 clients, conducted 1417 rapid HIV tests and tested 77 never-tested individuals. Rapid testing produced a high reactive rate (2%). Only 1/28 of those with reactive tests had no previous HIV testing, and 36% had used post-exposure prophylaxis, suggesting missed opportunities for prevention. Findings highlight diverse client vulnerability profiles and the relevance of checkpoints and further prevention efforts.

  7. Traitement orthopédique d'une fracture pathologique du fémur sur malformation veineuse: à propos d'un cas

    PubMed Central

    Guelzim, Soufiane; Lamrani, Omar; Kharmaz, Mohammed; Lahlou, Abdo; Elouadghiri, Mohammed; El Bardouni, Ahmed; Mahfoud, Mustapha; Berrada, Mohammed Saleh; El Yaccoubi, Mouradh

    2015-01-01

    Les malformations vasculaires artérioveineuse, veineuse ou lymphatique représentent des défects localisés dans la morphogénèse vasculaire. Elles peuvent survenir dans tous les organes, mais prédominent au niveau de membres, plus souvent dans la peau, les espaces celluleux ou les muscles. Le bilan de nombreuses malformations a été transformé par l'utilisation de l'angioscanner avec reconstruction ou de l'IRM. Les auteurs rapportent un cas de fracture pathologique du fémur proximal gauche sur malformation veineuse, chez une patiente de 35 ans. Le diagnostic a été porté sur un faisceau d'arguments cliniques et paracliniques. La radiographie standard a montré une fracture diaphysaire du tiers supérieur du fémur gauche sur os pathologique. L'IRM de la cuisse gauche ainsi qu'un phléboscanner des membres inférieurs ont objectivé un aspect en faveur d'une malformation veineuse. Vu le déplacement minime de la fracture et le risque très important de saignement peropératoire, la patiente a bénéficié d'un traitement orthopédique; l’évolution a été simple, marquée par une consolidation au sixième mois. PMID:26600903

  8. A Qualitative Analysis of the Lesbian Connection's Discussion Forum

    ERIC Educational Resources Information Center

    Erwin,Terry McVannel

    2006-01-01

    Letters submitted to the discussion forum of the Lesbian Connection between 2000 and 2002 were analyzed to identify issues of importance to lesbians. The analysis revealed 5 discussion categories: (a) isolation, safety, and aging; (b) children; (c) lesbian relationships and sexuality; (d) physical and mental health; and (e) political issues. The…

  9. Social Conversation and Effective Discussion in Online Group Learning

    ERIC Educational Resources Information Center

    Chen, Fei-Ching; Wang, Thomas C.

    2009-01-01

    This paper studies the social talk of high school students in online discussion forums. On-task talk has generally been assessed as valuable discussion because it contributes directly to productive learning. Off-task conversation, on the other hand, is often regarded as useless and a waste of time. Should this social talk indeed be regarded as an…

  10. Reporting and Discussing Effect Size: Still the Road Less Traveled?

    ERIC Educational Resources Information Center

    McMillan, James H.; Foley, Jennifer

    2011-01-01

    This study shows the extent to which effect size is reported and discussed in four major journals. A series of judgments about different aspects of effect size were conducted for 417 articles from four journals. Results suggest that while the reporting of simple effect size indices is more prevalent, substantive discussions of the meaning of…

  11. Weeding Out the Truth: Adolescents and Cannabis: Case and Discussion.

    PubMed

    Caspersen, Shannon; Tau, Gregory Z; Ammerman, Seth

    2016-01-01

    This clinical case conference discusses the case of an adolescent presenting with a marijuana use disorder. Information about a real patient is presented to expert clinicians, who respond to the information by sharing their reasoning and recommendations, followed by a summary of the clinical discussion.

  12. Teachers' Discussions of Emotion in Child Care Centers

    ERIC Educational Resources Information Center

    Ahn, Hey Jun

    2005-01-01

    Teachers have the opportunity to discuss the emotions of children as they occur in the context of the classroom. As such, teachers play an important role in the socialization of emotions of young children. This observational study examines teachers' discussions of emotions in three child care centers. The findings suggest that child care centers…

  13. Analysis of the Relevance of Posts in Asynchronous Discussions

    ERIC Educational Resources Information Center

    Azevedo, Breno T.; Reategui, Eliseo; Behar, Patrícia A.

    2014-01-01

    This paper presents ForumMiner, a tool for the automatic analysis of students' posts in asynchronous discussions. ForumMiner uses a text mining system to extract graphs from texts that are given to students as a basis for their discussion. These graphs contain the most relevant terms found in the texts, as well as the relationships between them.…

  14. Facilitating Meaningful Discussion Groups in the Primary Grades

    ERIC Educational Resources Information Center

    Moses, Lindsey; Ogden, Meridith; Kelly, Laura Beth

    2015-01-01

    This Teaching Tips describes a yearlong process of facilitating meaningful discussion groups about literature with first-grade students in an urban Title I school. At the beginning of the year, the teacher provided explicit instruction in speaking and listening skills to support students with the social skills needed for thoughtful discussion. She…

  15. 40 CFR 158.340 - Discussion of formation of impurities.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... require an expanded discussion of information on impurities: (1) From other possible chemical reactions... why they may be present. The discussion should be based on established chemical theory and on what the... range of levels) of these impurities. (iii) The intended reactions and side reactions which may occur...

  16. 14 CFR § 1203.200 - Background and discussion.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 14 Aeronautics and Space 5 2014-01-01 2014-01-01 false Background and discussion. § 1203.200 Section § 1203.200 Aeronautics and Space NATIONAL AERONAUTICS AND SPACE ADMINISTRATION INFORMATION SECURITY PROGRAM NASA Information Security Program § 1203.200 Background and discussion. (a)...

  17. Discussing Business and Economy with Intermediate Students of Japanese.

    ERIC Educational Resources Information Center

    Koike, Shohei

    Some strategies for developing educational materials are offered based on the idea that intermediate students of Japanese, if provided with appropriate materials and instruction, can engage in sustained non-technical discussion of business and economic topics much as native speakers do in social interaction. The discussion focuses on how to select…

  18. Supporting Mathematical Discussions: The Roles of Comparison and Cognitive Load

    ERIC Educational Resources Information Center

    Richland, Lindsey E.; Begolli, Kreshnik Nasi; Simms, Nina; Frausel, Rebecca R.; Lyons, Emily A.

    2017-01-01

    Mathematical discussions in which students compare alternative solutions to a problem can be powerful modes for students to engage and refine their misconceptions into conceptual understanding, as well as to develop understanding of the mathematics underlying common algorithms. At the same time, these discussions are challenging to lead…

  19. Tobacco-Free School Policy. A Discussion Paper

    ERIC Educational Resources Information Center

    Montana Office of Public Instruction, 2005

    2005-01-01

    This paper provides a background and discussion regarding tobacco-free schools. The paper is intended to enhance discussion about the health benefits to children who attend schools that have a comprehensive tobacco-free school policy. The benefits to the personal health of students are both direct and environmental. Direct health benefits from a…

  20. Fine-Tuning the Craft of Teaching by Discussion

    ERIC Educational Resources Information Center

    Huang, Li-Shih

    2005-01-01

    Extensive research in cognitive psychology and education shows that discussion facilitates "depth of processing" (Craik & Lockhart, 1972), which in turn promotes thinking, understanding, and retaining information. It is also well recognized that an effectively facilitated discussion is one of the most valuable vehicles for learning. In MBA…

  1. Reconceptualising Moderation in Asynchronous Online Discussions Using Grounded Theory

    ERIC Educational Resources Information Center

    Vlachopoulos, Panos; Cowan, John

    2010-01-01

    This article reports a grounded theory study of the moderation of asynchronous online discussions, to explore the processes by which tutors in higher education decide when and how to moderate. It aims to construct a theory of e-moderation based on some key factors which appear to influence e-moderation. It discusses previous research on the…

  2. Analysis of Asynchronous Online Discussion Using the SOLO Taxonomy

    ERIC Educational Resources Information Center

    Holmes, Kathryn

    2005-01-01

    The online learning environment provides the opportunity for remote groups of students to interact with instructors and each other. Most web based learning platforms facilitate synchronous online discussions between participants. These discussion forums are designed to replicate the face to face tutorial setting and provide a medium for the…

  3. Main Field Test Report. Discussing Controversial Issues. Revised.

    ERIC Educational Resources Information Center

    Lai, Morris K.; And Others

    Discussing Controversial Issues (DCI) is a skill training program designed for high school students and teachers with an overall objective of developing student and teacher skill in discussing controversial issues effectively. The course materials identify 13 moderator techniques which teachers practice, and 13 participant techniques which…

  4. Classroom Discussions: Seeing Math Discourse in Action, Grades K-6

    ERIC Educational Resources Information Center

    Anderson, Nancy; Chapin, Suzanne; O'Connor, Cathy

    2011-01-01

    "Classroom Discussions: Seeing Math Discourse in Action, Grades K-6" provides preservice and inservice instructors, coaches and facilitators with real, classroom-based video examples that illustrate the principles and practices covered in the authors' best-selling book, "Classroom Discussions: Using Math Talk to Help Students Learn, Grade K-6,…

  5. Designs, Management Tactics, and Strategies in Asynchronous Learning Discussions.

    ERIC Educational Resources Information Center

    Tu, Chih-Hsiung; Corry, Michael

    2003-01-01

    Discusses effective designs, management tactics, and strategies to produce ideal asynchronous network discussions that allow contemplation and encourage the development of critical thinking. A model of an online collaborative learning community is applied to implement the designs. A sample of online collaborative moderation guidelines is…

  6. IRIS Toxicological Review for Carbon Tetrachloride (Interagency Science Discussion Draft)

    EPA Science Inventory

    EPA released the draft report,Toxicological Review for Carbon Tetrachloride(Interagency Science Discussion Draft), that was distributed to Federal agencies and White House Offices for comment during the Science Discussion step of the IRIS Assessment Development Process. Co...

  7. Online Discussion in a Hybrid Information Literacy Credit Course

    ERIC Educational Resources Information Center

    Jacobs, Warren N.

    2007-01-01

    This article discusses how an instruction librarian created an online learning community of adult learners in a hybrid, credit-bearing information literacy course. The Blackboard course management system was utilized for weekly course discussion on ethical issues involving the use of information to promote student engagement in the critical…

  8. Motivating a Productive Discussion of Normative Issues through Debates

    ERIC Educational Resources Information Center

    Hennessey, Jessica

    2014-01-01

    In this article, the author presents a way of using in-class debates to discuss contentious issues and help students develop critical thinking skills. Three elements were incorporated into an undergraduate public finance course: a presentation of ethical approaches in order to formally discuss normative issues, class debates which required…

  9. Religious Observance by Muslim Employees: A Framework for Discussion.

    ERIC Educational Resources Information Center

    Commission for Racial Equality, London (England).

    This paper discusses the relationship between the religious practices of Muslim employees and the requirements of the workplace. It is designed to provide information on the norms of Islam and the difficulties involved in its workplace practice, and to propose suggestions for resolving these difficulties that can form the basis for discussion and…

  10. Perspective-Taking in Structured and Unstructured Online Discussions

    ERIC Educational Resources Information Center

    Chadwick, Scott; Ralston, Ekaterina

    2010-01-01

    This study analyzes the extent to which students using web-based discussion boards show an increase in perspective-taking in structured and unstructured discussions. Messages from fifty-six students enrolled in one of two courses were content analyzed using Jarvela and Hakkinen's (2003) expansion of Selman's (1980) perspective-taking coding…

  11. Bullying, Intimidation and Harassment Prevention School Policy. A Discussion Paper

    ERIC Educational Resources Information Center

    Montana Office of Public Instruction, 2005

    2005-01-01

    This paper provides a background and discussion regarding the need for school policy and procedures to prevent bullying, intimidation and harassment in schools. The paper is intended to focus discussion on the responsibility of school boards, administrators and staff in making the school environment a safe place for all students. In so doing,…

  12. Using Online Discussion Groups in a CALL Teacher Training Course

    ERIC Educational Resources Information Center

    Son, Jeong-Bae

    2006-01-01

    This paper reports the results of a study that examined an online discussion group established for a computer-assisted language learning (CALL) course and investigated patterns of interactions generated through the online discussion and participants' attitudes toward the computer-mediated communication (CMC) activity. The participants in the study…

  13. Enabling Easier Information Access in Online Discussion Forums

    ERIC Educational Resources Information Center

    Bhatia, Sumit

    2013-01-01

    Online discussion forums have become popular in recent times. They provide a platform for people from different parts of the world sharing a common interest to come together and topics of mutual interest and seek solutions to their problems. There are hundreds of thousands of internet forums containing tens of millions of discussion threads and…

  14. 29 CFR 784.2 - Matters discussed in this part.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 29 Labor 3 2012-07-01 2012-07-01 false Matters discussed in this part. 784.2 Section 784.2 Labor... APPLICABLE TO FISHING AND OPERATIONS ON AQUATIC PRODUCTS General Introductory § 784.2 Matters discussed in... and other forms of aquatic life....

  15. 29 CFR 784.2 - Matters discussed in this part.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 29 Labor 3 2014-07-01 2014-07-01 false Matters discussed in this part. 784.2 Section 784.2 Labor... APPLICABLE TO FISHING AND OPERATIONS ON AQUATIC PRODUCTS General Introductory § 784.2 Matters discussed in... and other forms of aquatic life....

  16. Using Discussion Pedagogy to Enhance Oral and Written Communication Skills

    ERIC Educational Resources Information Center

    Dallimore, Elise J.; Hertenstein, Julie H.; Platt, Marjorie B.

    2008-01-01

    This research project examines students' reactions to in-class discussion as an instructional technique by investigating the effect of participation practices on communication-based skill development. The findings provide evidence that active preparation and participation in class discussion can be linked to students' reports of improved oral and…

  17. 10 CFR 820.35 - Ex parte discussions.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 4 2012-01-01 2012-01-01 false Ex parte discussions. 820.35 Section 820.35 Energy DEPARTMENT OF ENERGY PROCEDURAL RULES FOR DOE NUCLEAR ACTIVITIES Enforcement Process § 820.35 Ex parte discussions. At no time after a respondent has requested an on-the-record adjudication of the assessment of...

  18. Negotiating Meaning in a Seminar-Type Discussion and EAP.

    ERIC Educational Resources Information Center

    Basturkmen, Helen

    2002-01-01

    Reports on a study exploring patterns of discourse organization in seminar-type discussions. Analysis was made of patterns of sequential organization in discussions between English for academic purposes students in university seminars in the United Kingdom. Analysis revealed two patterns of organization: simple exchanges of pre-formed ideas and…

  19. Searching for Intertextual Connections in Small Group Text Discussion

    ERIC Educational Resources Information Center

    Chi, Feng-ming

    2012-01-01

    This paper reports the sources for and intentions of intertextuality made by 10 groups of Taiwanese university students in the process of discussing two American stories. Two types of data, small group text discussions and oral interviews, were gathered. The results indicated that participants used diverse sources of intertextual links, and with…

  20. Graphically Mapping Electronic Discussions: Understanding Online Conversational Dynamics

    ERIC Educational Resources Information Center

    Duncan-Howell, Jennifer

    2008-01-01

    Transcripts of electronic discussions have traditionally been examined via the use of conversational analysis techniques. Coding such transcripts provides rich data regarding the content and nature of the discussions that take place. However, understanding the content of a message is not limited to the actual message itself. An electronic message…

  1. Student Moderators in Asynchronous Online Discussion: A Question of Questions

    ERIC Educational Resources Information Center

    Zingaro, Daniel

    2012-01-01

    Much current research exalts the benefits of having students facilitate weekly discussions in asynchronous online courses. This study seeks to add to what is known about student moderation through an analysis of the types of questions students use to spur each discussion. Prior experimental work has demonstrated that the types of questions posed…

  2. Opening the World of Mathematics: The Daily Math Discussion

    ERIC Educational Resources Information Center

    Donoahue, Zoe

    2016-01-01

    During the author's everyday math discussions with her class, young children talk about mathematical ideas, theories, and concepts within a predictable structure. These discussions include many concepts from--and beyond--the first-grade math curriculum, and their depth and complexity build throughout the school year. Concepts and skills include…

  3. Education for Judgment: The Artistry of Discussion Leadership.

    ERIC Educational Resources Information Center

    Christensen, C. Roland, Ed.; And Others

    This book offers a collection of essays on teaching, written by teachers who, though they represent high school to professional school levels and diverse fields of interest, favor teaching by discussion. Part I introduces key principles in "Barriers and Gateways to Learning" (David A. Garvin) and "Premises and Practices of Discussion Teaching" (C.…

  4. Increasing Student Participation in Online Group Discussions via Facebook

    ERIC Educational Resources Information Center

    Miller, Scott T.

    2013-01-01

    A comparison study between two different methods of conducting online discussions in an introductory astronomy course was performed to determine if the use of Facebook as an online discussion tool has an impact on student participation as well as student response time. This study shows that students using Facebook for their online discussions…

  5. Frustration and Fulfillment: The Talk of Literature Discussion Groups.

    ERIC Educational Resources Information Center

    Wollman-Bonilla, Julie E.

    Two different groups of sixth graders were studied as one discussed Roald Dahl's "James and the Giant Peach" and the other discussed Mark Twain's "Tom Sawyer." In interviews, students from the two groups offered very different assessments of their experiences, despite the fact that the teacher was the same. The Dahl students,…

  6. Noon-Hour Discussion: Dealing with the Burdens of Capability.

    ERIC Educational Resources Information Center

    Peterson, Jean S.

    1990-01-01

    Small groups of gifted high school students meet weekly during lunch periods to have topical discussions, with the goals of developing self-awareness and affirming capability. As the school year progresses, the group discussions become less structured, with more free-wheeling exchange. Topics include learning styles, stress, suicide, and college…

  7. 40 CFR 158.340 - Discussion of formation of impurities.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 24 2011-07-01 2011-07-01 false Discussion of formation of impurities. 158.340 Section 158.340 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR PESTICIDES Product Chemistry § 158.340 Discussion of formation...

  8. 40 CFR 158.340 - Discussion of formation of impurities.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 25 2013-07-01 2013-07-01 false Discussion of formation of impurities. 158.340 Section 158.340 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR PESTICIDES Product Chemistry § 158.340 Discussion of formation...

  9. 40 CFR 158.340 - Discussion of formation of impurities.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 40 Protection of Environment 25 2012-07-01 2012-07-01 false Discussion of formation of impurities. 158.340 Section 158.340 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PESTICIDE PROGRAMS DATA REQUIREMENTS FOR PESTICIDES Product Chemistry § 158.340 Discussion of formation...

  10. The Challenge of Moving beyond the Literal in Literature Discussions

    ERIC Educational Resources Information Center

    Serafini, Frank; Ladd, Sophie M.

    2008-01-01

    Drawing on data associated with an investigation of classroom read alouds and discussions of children's literature, this article conceptualizes the reading aloud and discussions of picturebooks as an "interpretive space" for elementary grade students' exploration of visual images and written text. Analyzing the types of responses…

  11. Voicing on Virtual and Face to Face Discussion

    ERIC Educational Resources Information Center

    Yamat, Hamidah

    2013-01-01

    This paper presents and discusses findings of a study conducted on pre-service teachers' experiences in virtual and face to face discussions. Technology has brought learning nowadays beyond the classroom context or time zone. The learning context and process no longer rely solely on face to face communications in the presence of a teacher.…

  12. 23 CFR 636.502 - Why should I use discussions?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false Why should I use discussions? 636.502 Section 636.502 Highways FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION ENGINEERING AND TRAFFIC OPERATIONS DESIGN-BUILD CONTRACTING Discussions, Proposal Revisions and Source Selection § 636.502 Why should I...

  13. "Does Your Dog Bite?": Creating Good Questions for Online Discussions

    ERIC Educational Resources Information Center

    Toledo, Cheri A.

    2006-01-01

    One of the challenges of asynchronous online discussions is soliciting student responses that involve critical thinking. Too often students answer one another with "I agree" or "That's what I think" and the discussion dead ends. By providing students with models of good questioning techniques instructors will see the class…

  14. Case-Based Instruction Using Asynchronous Online Discussions: A Synthesis

    ERIC Educational Resources Information Center

    Pena-Shaff, Judith B.; Altman, William S.

    2009-01-01

    The authors describe the implementation of a teaching strategy combining case-based instruction (CBI) and asynchronous online discussions in two large educational psychology classes. Based on previous use of case studies and on recommendations developed through previous research on asynchronous online discussions, they predicted that students…

  15. Discussion Strategies for the Inclusion of ALL Students

    ERIC Educational Resources Information Center

    Weih, Timothy G.

    2015-01-01

    Student-centered discussion strategies are described in this article in pursuance of insuring that ALL student voices have a chance to be heard in the classroom. Discussion strategies that are presented include the following: The 10 Second Rule, Think-Pair-Share, Quick Writes, Recorder-Reporter, and K-W-L.

  16. Using Text Mining to Characterize Online Discussion Facilitation

    ERIC Educational Resources Information Center

    Ming, Norma; Baumer, Eric

    2011-01-01

    Facilitating class discussions effectively is a critical yet challenging component of instruction, particularly in online environments where student and faculty interaction is limited. Our goals in this research were to identify facilitation strategies that encourage productive discussion, and to explore text mining techniques that can help…

  17. Analysis of an Online Case Discussion about Teaching Stochastics

    ERIC Educational Resources Information Center

    Groth, Randall E.

    2006-01-01

    Online learning, case discussions, and stochastics instruction have all become increasingly active strands of research in mathematics education. This study integrates the three strands. The nature of the discourse during an online case discussion among prospective secondary teachers is analysed. The case focused on the teaching and learning of a…

  18. Strategies for Reporting Small-Group Discussions to the Class.

    ERIC Educational Resources Information Center

    Brookfield, Stephen D.; Preskill, Stephen

    1999-01-01

    Suggests five activities for the college classroom to stimulate discussion when students report results of small- group discussions to the class as a whole. The activities "newsprint dialogue," rotating small-group stations, "snowballing,""cocktail party," and "jigsaw" stress maximum student participation, interaction, and intellectual engagement.…

  19. Workforce Intermediation for Vulnerable Youth: Workforce Initiatives Discussion Paper #4

    ERIC Educational Resources Information Center

    Academy for Educational Development, 2011

    2011-01-01

    This paper's intention is to spur discussion about the roles of "workforce intermediation" as it relates to youth development and employability. It is certainly not meant to be an exhaustive discussion about either topic. It does, however, intend to further the dialogue on international workforce initiatives and the requisite workforce…

  20. Minding the Gap: Annotation as Preparation for Discussion

    ERIC Educational Resources Information Center

    Feito, Jose Alfonso; Donahue, Patricia

    2008-01-01

    This research project examines classroom discussion in its relationship to reading as made visible through the practice of textual annotation. In order to develop a rich description of student reading/discussion processes, we targeted multiple undergraduate seminars at a liberal arts college as they encountered the first two Acts of Shakespeare's…

  1. The Socratic Dialogue in Asynchronous Online Discussions: Is Constructivism Redundant?

    ERIC Educational Resources Information Center

    Kingsley, Paul

    2011-01-01

    Purpose: This paper aims to examine Socratic dialogue in asynchronous online discussions in relation to constructivism. The links between theory and practice in teaching are to be discussed whilst tracing the origins of Socratic dialogue and recent trends and use of seminar in research based institutions. Design/methodology/approach: Many online…

  2. Discontinuities in University Student Experiences of Learning through Discussions

    ERIC Educational Resources Information Center

    Ellis, Robert A.; Calvo, Rafael A.

    2006-01-01

    This article reports on research into the student experience of learning through discussions in a third-year undergraduate engineering subject. Information engineering students studying e-commerce were required to engage in face-to-face and online discussions as a key aspect of their learning experience. This study investigates the quality of the…

  3. Infant Family Day Care Training: Discussion and Workshop Sheets.

    ERIC Educational Resources Information Center

    Lauritzen, Phyllis; McClain, Doris G.

    Training materials for family day care providers are offered in this document in the form of pages providing topics for discussion and suggested workshop activities. Discussion materials consist of prototype forms for gathering data and keeping records, as well as guidelines for caregiving functions such as feeding, first aid, arranging the home…

  4. How to Create Successful Discussions in Science Classrooms

    ERIC Educational Resources Information Center

    Grover, Neena

    2007-01-01

    Professors often expect students to have the skills that are necessary to participate in discussions. Students, on the other hand, have been trained to glean information from the lecture format; their prior experiences in discussions are likely to be limited to personal opinions on topics such as stem-cell research or evolution. Sudden changes in…

  5. Improving the Asynchronous Online Learning Environment Using Discussion Boards

    ERIC Educational Resources Information Center

    Ringler, Ilene; Schubert, Carol; Deem, Jack; Flores, Jimmie; Friestad-Tate, Jill; Lockwood, Robert

    2015-01-01

    Discussion Boards are at the heart of an Asynchronous Online Learning or Distance Education Environment and can have a great impact on the learning experience. Understanding the individual factors that create a high quality discussion board experience for students and their interrelationships is critical to continuous improvement in distance…

  6. Teachers' Experiences Relative to Successful Questioning and Discussion Techniques

    ERIC Educational Resources Information Center

    Robitaille, Yvette Powell; Maldonado, Nancy

    2015-01-01

    Questioning and discussion techniques are effective instructional methods, but there is often inconsistent implementation of these instructional methods. This case study explored teachers and evaluators' perceptions regarding exemplary questioning and discussion techniques. Participants included 9 teachers who earned exemplary marks on their…

  7. Effects of Immediate Instructor Feedback on Group Discussion Participants.

    ERIC Educational Resources Information Center

    Jurma, William E.; Froelich, Deidre L.

    1984-01-01

    Investigated the effects of immediate instructor feedback, via a video display system (ComET system), on the performance of group discussion participants. Found that receivers of immediate feedback were more satisfied with their performances, participated in discussions of higher quality, and were no more anxious than individuals not receiving…

  8. Helping Mothers Discuss Sexuality and AIDS with Adolescents.

    ERIC Educational Resources Information Center

    Lefkowitz, Eva S.; Sigman, Marian; Au, Terry Kit-fong

    2000-01-01

    Examined impact of experimentally altering mothers' style when discussing sexuality and AIDS with adolescent children. Found that intervention group mothers reduced their amount of speaking, asked more open-ended questions, acted less judgmental, and discussed dating and sexuality more than did control group mothers. Intervention group adolescents…

  9. Permeable Textual Discussion in Tracked Language Arts Classrooms

    ERIC Educational Resources Information Center

    Gritter, Kristine

    2012-01-01

    Permeable textual discussion occurs when the unofficial texts and discursive practices and personal histories that are already recognized and valued in students' cultures are scaffolds to academically sanctioned literacies. Ideally, permeable textual discussions are safe havens where students' identities (racial, gender, world views) are…

  10. Articulation and Transfer: Critical Contributions to Lifelong Learning -- Discussion Supplement.

    ERIC Educational Resources Information Center

    Kintzer, Frederick C.

    This document is a discussion supplement to Frederick Kintzer's paper in the book: "Lifelong Learning: Policies, Practices and Programs." It is designed as a contribution to the third discussion session: Participation Issues and Lifelong Learning. The introduction provides definitions and a description of the rise of lifelong learning…

  11. Adolescents' Perception of Discussions with Parents and Friends.

    ERIC Educational Resources Information Center

    Hunter, Fumiyo Tao

    1985-01-01

    Through written responses to a questionnaire, adolescents' perceptions of discussions with parents and friends were examined with reference to academic/vocational, social/ethical, family, and peer domains. Findings are discussed in terms of differences in procedures of social construction between parents' and friends' socializing influences.…

  12. Increasing Educational Efficiency Through Technology (Commission Discussion and Background Materials).

    ERIC Educational Resources Information Center

    Indiana State Commission for Higher Education, Indianapolis.

    A program schedule and background information for Indiana Commission for Higher Education-sponsored discussion of the use of educational technology to increase educational effeciency are presented. The four major topics of discussion to illustrate the uses and advantages/disadvantages of audio, video, and computing technologies are as follows:…

  13. Workplace Literacy: Business, Government, and Academic Perspectives. Panel Discussion.

    ERIC Educational Resources Information Center

    Malicky, Grace, Comp.; Dieleman, Carolyn; Campbell, Lloyd; Wong, Bill; Krahn, Harvey

    1998-01-01

    Presents highlights of a panel discussion on workplace literacy at the Literacy in the 21st Century Research Conference (Edmonton, Alberta, October 1997). Participants from business, government, and university discussed Syncrude Canada's Workplace Literacy Program, implications of the International Adult Literacy Survey for the labor market, and…

  14. Designing Discussions: Four Ways to Open up a Dialogue

    ERIC Educational Resources Information Center

    Henning, John E.; Nielsen, Lynn E.; Henning, Maria C.; Schulz, Eric Uwe

    2008-01-01

    Discussion-based teaching has long been recognized as a way to promote civic engagement. However, increasing the amount and quality of student talk in social studies classrooms has proven very difficult in practice. This article's purpose is to show how teachers can design a discussion to increase student involvement. A well-designed discussion…

  15. Language-Rich Discussions for English Language Learners

    ERIC Educational Resources Information Center

    Zhang, Jie; Anderson, Richard C.; Nguyen-Jahiel, Kim

    2013-01-01

    A study involving 75 Spanish-speaking fifth graders from a school in the Chicago area investigated whether a peer-led, open-format discussion approach, known as Collaborative Reasoning, would accelerate the students' English language development. Results showed that, after participating in eight discussions over a four-week period, the CR group…

  16. Increasing Social Presence in Online Learning through Small Group Discussions

    ERIC Educational Resources Information Center

    Akcaoglu, Mete; Lee, Eunbae

    2016-01-01

    Social presence is difficult to achieve, but an imperative component of online learning. In this study, we investigated the effect of group size on students' perceptions of social presence in two graduate-level online courses, comparing small group versus whole class discussions. Our results indicated that when in small group discussions, students…

  17. Video from Panel Discussion with Joseph Fraumeni and David Schottenfeld

    Cancer.gov

    Video footage from Panel Discussion with Joseph Fraumeni and David Schottenfeld on Cancer Epidemiology over the Last Half-Century and Thoughts on the Future. The discussion took place on May 11, 2012, when DCEG hosted Dr. Schottenfeld as a Visiting Scholar.

  18. How To Make Discussion Forums Work on the WWW.

    ERIC Educational Resources Information Center

    Maurer, Hermann; Rozsenich, Norbert; Sapper, Marianne

    This paper discusses the technical features necessary for a good World Wide Web (WWW) discussion forum, the fact that it should be seen as part of a more general cooperative space, and psycho-sociological aspects that are essential for success. The first section introduces the paper and lists reasons why newsgroups are generally more successful…

  19. Scaffolding Student Talk: One Teacher's Role in Literature Discussion Groups.

    ERIC Educational Resources Information Center

    Maloch, Beth

    2002-01-01

    Explores the relationship between the teacher's role and the students' participation within literature discussion groups in a third-grade classroom. Finds two salient themes: the problematic nature of students' transition from a teacher-led to a student-led discussion format; and the responsive nature of the teacher's interventions relative to…

  20. Facilitating Effective Small Group Discussions of Controversial Issues.

    ERIC Educational Resources Information Center

    Hendrix, Jon R.; And Others

    1983-01-01

    Describes four components of a packet of materials designed for small-group discussions on alphafetoprotein (AFP) screening for neural tube defects. Components consist of instructional guidelines for group leader, informational packet on AFP, list of specific discussion questions, and student evaluation form. Copies of these materials are…

  1. Examining how discussing underrepresentation may mediate female engagement in physics

    NASA Astrophysics Data System (ADS)

    Lock, Robynne M.; Tompkins, Reganne; Hazari, Zahra

    2013-04-01

    Despite the large number of female students taking high school physics, only about a fifth of physics bachelor's degrees are awarded to women. In a previous study, we tested five factors commonly proposed to positively impact female students' choice of a physical science career using multivariate matching methods on national survey data. Four of these factors (having a single-sex class, having female scientist guest speakers, having a female physics teacher, and discussing the work of female scientists) were found to have no effect. The only factor found to have a positive effect was the explicit discussion of the underrepresentation of women in physics. In order to explore this further, a case study of the classes of one teacher reported to discuss the underrepresentation of women was conducted. Two classroom underrepresentation discussions were recorded, students and teacher were interviewed, and relevant student work was collected. Analyzing the case study data, we report on how discussing underrepresentation may mediate female engagement in physics.

  2. Use facilitated case discussions for significant event auditing.

    PubMed Central

    Robinson, L. A.; Stacy, R.; Spencer, J. A.; Bhopal, R. S.

    1995-01-01

    An important type of review undertaken routinely in health care teams is analysis of individual cases. This informal process can be turned into a structured and effective form of audit by using an adaptation of the "critical incident" technique in facilitated case discussions. Participants are asked to recall personal situations that they feel represent either effective or ineffective practice. From such review of individual cases arise general standards to improve the quality of care. On the basis of a study of audit of deaths in general practice, we describe how to implement such a system, including forming and maintaining the discussion group, methodology, and guidelines for facilitators. Problems that may arise during the case discussions are outlined and their management discussed, including problems within the team and with the process of the discussions. PMID:7633248

  3. Online discussions with pregnant and parenting adolescents: perspectives and possibilities.

    PubMed

    Valaitis, Ruta K; Sword, Wendy A

    2005-10-01

    The Internet is an innovative strategy to increase public participation. It is important to include pregnant and parenting teens' perspectives when planning programs to meet their needs. This qualitative study explored online discussions as a strategy to enhance participation by this population. Findings showed that online communication was preferred over face-to-face group discussions. Being anonymous online encouraged open and honest feedback. Participants experienced various forms of social support, however, there was an overall lack of teen involvement online. Strategies to engage adolescents in online discussions and reduce barriers are discussed. Strategies included the use of teen moderators, home computer access, technical support, and engagement in naturally flowing online discussions to meet social support needs. Blending researchers' with teens' needs for social support in an online environment is encouraged. With careful planning and design, online communications can result in mutual benefits for researchers, service providers, and pregnant and parenting adolescents.

  4. Evaluation of an online discussion forum for emergency practitioners.

    PubMed

    Curran, Janet A; Abidi, Syed Sibte Raza

    2007-12-01

    Knowledge is a critical element in the delivery of quality healthcare. In a busy emergency department (ED) clinicians attempting clinically relevant discussion with their peers face multiple interruptions and a lack of sustained meaningful interactions. Information and communication technologies such as online discussion forums enable practitioners to share practice knowledge at times that fit into their daily workflow. We conducted an experiment in which we provided emergency clinicians with access to an asynchronous discussion forum as a medium to support development of an online social network for information exchange. The outcomes were evaluated using a social network perspective to better understand the knowledge seeking and sharing behaviors among rural and urban emergency practitioners participating in the online discussion forum. The online discussion forum created an opportunity for emergency practitioners from multiple ED sites to engage in dialogue around topics that were relevant to their practice learning needs.

  5. Syndrome de larva migrans cutanée sur pied malformé (à propos d'un cas)

    PubMed Central

    Benbella, Imane; Khalki, Hanane; Lahmadi, Khalid; Kouara, Sara; Abbadi, Abderrahim; Er-rami, Mohammed

    2016-01-01

    Le syndrome de larva migrans cutanée est une dermite sous cutanée causée par des larves d'ankylostomes d'animaux en impasse parasitaire chez l'homme. L'infestation transcutanée est favorisée par le contact avec le sol contaminé par les larves du parasite. Nous rapportons le cas d'un nourrisson de 15 mois, originaire de Guinée-Bissau, atteint d'un syndrome de larva migrans cutanée sur un pied malformé. Cette malformation sous forme d'une syndactylie associée à une tuméfaction du pied, était à l'origine d'un retard d'acquisition de la station debout. De même, on a rapporté une notion de pieds nus, vue la difficulté de chausser le pied malformé du patient. Tous ces facteurs auraient contribués à favoriser l'infestation du malade par les larves du nématode. PMID:27217876

  6. Infection rates in Dipetalogaster maximus (Reduviidae: Triatominae) by Trypanosoma cruzi in the Cape Region, Baja California Sur, México.

    PubMed

    Jiménez, María-Luisa; Llinas, Jorge; Palacios, Carlos

    2003-01-01

    Infection rates of Trypanosoma cruzi Chagas (in the blood-sucking bug Dipetalogaster maximus [Uhler]) were determined from specimens collected at 12 localities in the Cape Region of Baja California Sur, Mexico. Eight collection sites were located in the tropical dry forest, two in desert shrub, and two in the ecotone between these two communities. Of the 245 D. maximus collected, 65% were first and second instar nymphs; 32.6% were third, fourth, and fifth instar nymphs; and 2.4% were adults. The highest proportion of specimens came from El Fandango (30%) and San Bartolo (23%) canyons and La Cruz hill (12%) in the mountain slopes facing the Gulf of California. In feces from individual bugs analyzed for T. cruzi, we found an overall infection rate of 7.0%. Infection rates increased from 4.1% in second instars to 42.% in fifth instars. High infection rates were found in bugs collected from La Poza (38.4%), El Gato (27.2%), and El Pedregoso (25%) hills; low infection rates were found in specimens from La Cruz hill and San Bartolo canyon. Specimens from some collection sites were not infected with T. cruzi.

  7. SUR1 Receptor Interaction with Hesperidin and Linarin Predicts Possible Mechanisms of Action of Valeriana officinalis in Parkinson

    PubMed Central

    Santos, Gesivaldo; Giraldez-Alvarez, Lisandro Diego; Ávila-Rodriguez, Marco; Capani, Francisco; Galembeck, Eduardo; Neto, Aristóteles Gôes; Barreto, George E.; Andrade, Bruno

    2016-01-01

    Parkinson’s disease (PD) is one of the most common neurodegenerative disorders. A theoretical approach of our previous experiments reporting the cytoprotective effects of the Valeriana officinalis compounds extract for PD is suggested. In addiction to considering the PD as a result of mitochondrial metabolic imbalance and oxidative stress, such as in our previous in vitro model of rotenone, in the present manuscript we added a genomic approach to evaluate the possible underlying mechanisms of the effect of the plant extract. Microarray of substantia nigra (SN) genome obtained from Allen Brain Institute was analyzed using gene set enrichment analysis to build a network of hub genes implicated in PD. Proteins transcribed from hub genes and their ligands selected by search ensemble approach algorithm were subjected to molecular docking studies, as well as 20 ns Molecular Dynamics (MD) using a Molecular Mechanic Poison/Boltzman Surface Area (MMPBSA) protocol. Our results bring a new approach to Valeriana officinalis extract, and suggest that hesperidin, and probably linarin are able to relieve effects of oxidative stress during ATP depletion due to its ability to binding SUR1. In addition, the key role of valerenic acid and apigenin is possibly related to prevent cortical hyperexcitation by inducing neuronal cells from SN to release GABA on brain stem. Thus, under hyperexcitability, oxidative stress, asphyxia and/or ATP depletion, Valeriana officinalis may trigger different mechanisms to provide neuronal cell protection. PMID:27199743

  8. Rupture utérine spontanée sur léiomyosarcome utérin

    PubMed Central

    Boussouni, Khouloud; Benoulaid, Meryem; Dafiri, Rachida

    2016-01-01

    Les sarcomes utérins sont des cancers rares caractérisés par leur polymorphisme clinique et histologique. Ce sont des tumeurs malignes de mauvais pronostic. Ils se révèlent, généralement, par des symptômes non spécifiques à type de douleurs pelviennes, métrorragies. Un tableau d'abdomen aigu avec hémopneumopéritoine est une présentation rare. Nous rapportons le cas d'un léiomyosarcome utérin qui s'est manifesté par une péritonite aigue généralisée inaugurale chez une femme de 43 ans. Le diagnostic de perforation utérine sur tumeur maligne a été suspecté par l'imagerie préopératoire en urgence (échographie et TDM) et confirmé histologiquement. PMID:27642425

  9. Marine diet and tobacco exposure affects mercury concentrations in pregnant women (I) from Baja California Sur, Mexico

    PubMed Central

    Gaxiola-Robles, Ramón; Bentzen, Rebecca; Zenteno-Savín, Tania; Labrada-Martagón, Vanessa; Castellini, J. Margaret; Celis, Alfredo; O’Hara, Todd; Celina Méndez-Rodríguez, Lía

    2017-01-01

    Seafood provides essential polyunsaturated fatty acids (PUFA) and other nutrients to pregnant women and their fetus(es) while a diet rich in finfish can be a major pathway of monomethyl mercury (MeHg+) exposure. We measured total mercury concentration ([THg]) in hair samples provided by 75 women in Baja California Sur (BCS) to assess its relationship with age, parity, tobacco smoke exposure, and diet based on survey methodologies. Generalized linear models (GLM) were used to explain the possible association of the different variables with [THg] in hair. Median [THg] in hair was 1.52 µgg−1, ranging from 0.12 to 24.19 µgg−1 and varied significantly by segment. Approximately 72% (54/75) of those evaluated exceed 1 µgg−1 [THg] and 8% (6/75) exceed 5 µgg−1 [THg] in hair. Although frequency of fish consumption contributed significantly to explaining hair [THg], fish consumption only explained 43% of [THg] in a GLM incorporating tobacco exposure and body mass index. This study establishes possible relationships among multiple potential sources of exposure and other factors related to [THg] in hair of women in the prenatal period. A more detailed examination of other sources of exposure and factors contributing to [THg] is warranted. PMID:28203532

  10. Marine diet and tobacco exposure affects mercury concentrations in pregnant women (I) from Baja California Sur, Mexico.

    PubMed

    Gaxiola-Robles, Ramón; Bentzen, Rebecca; Zenteno-Savín, Tania; Labrada-Martagón, Vanessa; Castellini, J Margaret; Celis, Alfredo; O'Hara, Todd; Celina Méndez-Rodríguez, Lía

    2014-01-01

    Seafood provides essential polyunsaturated fatty acids (PUFA) and other nutrients to pregnant women and their fetus(es) while a diet rich in finfish can be a major pathway of monomethyl mercury (MeHg(+)) exposure. We measured total mercury concentration ([THg]) in hair samples provided by 75 women in Baja California Sur (BCS) to assess its relationship with age, parity, tobacco smoke exposure, and diet based on survey methodologies. Generalized linear models (GLM) were used to explain the possible association of the different variables with [THg] in hair. Median [THg] in hair was 1.52 µgg(-1), ranging from 0.12 to 24.19 µgg(-1) and varied significantly by segment. Approximately 72% (54/75) of those evaluated exceed 1 µgg(-1) [THg] and 8% (6/75) exceed 5 µgg(-1) [THg] in hair. Although frequency of fish consumption contributed significantly to explaining hair [THg], fish consumption only explained 43% of [THg] in a GLM incorporating tobacco exposure and body mass index. This study establishes possible relationships among multiple potential sources of exposure and other factors related to [THg] in hair of women in the prenatal period. A more detailed examination of other sources of exposure and factors contributing to [THg] is warranted.

  11. La grossesse gémellaire sur un utérus pseudo unicorne: à propos d'un cas

    PubMed Central

    aheri, Hafsa; Saadi, Hanane; Benkirane, Saad; Mimouni, Ahmed

    2015-01-01

    L'incidence des malformations utérines est estimée dans la population générale entre 0,1 et 3%. La survenue d'une grossesse en cas de malformation utérine est une situation potentiellement à haut risque obstétrical. Nous décrivons un cas très rare d'une grossesse gémellaire sur un utérus pseudo unicorne découverte précocement à 8 SA, permettant la réalisation d'une hémihysterectomie de la corne rudimentaire prévenant ainsi le risque majeur de la rupture utérine. L’évolution était favorable jusqu’à 37 SA où la patiente a été programmée pour césarienne prophylactique. Le dépistage échographique au premier trimestre de la grossesse est donc primordial permettant la détection systématique de ce genre de malformation afin de prévenir les complications. PMID:26977238

  12. Biological influences on modern sulfates: Textures and composition of gypsum deposits from Guerrero Negro, Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Vogel, Marilyn B.; Des Marais, David J.; Parenteau, Mary N.; Jahnke, Linda L.; Turk, Kendra A.; Kubo, Michael D. Y.

    2010-01-01

    Gypsum (CaSO 4·2H 2O) deposits from a range of sedimentary environments at Guerrero Negro, Baja California Sur, Mexico were investigated for microscale texture and composition in order to differentiate features formed under substantial microbial influence from those for which microbial effects were relatively minor or absent. Gypsum deposits were classified according to their sedimentary environment, textures, crystal habit, brine composition and other geochemical factors. The environments studied included subaqueous sediments in anchialine pools and in solar salterns, as well as subsurface sediments of mudflats and saltpans. Gypsum that developed in the apparent absence of biofilms included crystals precipitated in the water column and subsedimentary discs that precipitated from phreatic brines. Subsedimentary gypsum developed in sabkha environments exhibited a sinuous microtexture and poikilitically enclosed detrital particles. Water column precipitates had euhedral prismatic habits and extensive penetrative twinning. Gypsum deposits influenced by biofilms included bottom nucleated crusts and gypsolites developing in anchialine pools and saltern ponds. Gypsum precipitating within benthic biofilms, and in biofilms within subaerial sediment surfaces provided compelling evidence of biological influences on crystal textures and habits. This evidence included irregular, high relief surface textures, accessory minerals (S°, Ca-carbonate, Sr/Ca-sulfate and Mg-hydroxide) and distinctive crystal habits such as equant forms and crystals having distorted prism faces.

  13. Baseline heavy metals and metalloid values in blood of loggerhead turtles (Caretta caretta) from Baja California Sur, Mexico.

    PubMed

    Ley-Quiñónez, C; Zavala-Norzagaray, A A; Espinosa-Carreón, T L; Peckham, H; Marquez-Herrera, C; Campos-Villegas, L; Aguirre, A A

    2011-09-01

    Environmental pollution due to heavy metals is having an increased impact on marine wildlife accentuated by anthropogenic changes in the planet including overfishing, agricultural runoff and marine emerging infectious diseases. Sea turtles are considered sentinels of ecological health in marine ecosystems. The objective of this study was to determine baseline concentrations of zinc, cadmium, copper, nickel, selenium, manganese, mercury and lead in blood of 22 clinically healthy, loggerhead turtles (Caretta caretta), captured for several reasons in Puerto López Mateos, Baja California Sur, Mexico. Zinc was the most prevalent metal in blood (41.89 μg g⁻¹), followed by Selenium (10.92 μg g⁻¹). The mean concentration of toxic metal Cadmium was 6.12 μg g⁻¹ and 1.01μg g⁻¹ respectively. Mean concentrations of metals followed this pattern: Zn>Se>Ni>Cu>Mn>Cd>Pb and Hg. We can conclude that blood is an excellent tissue to measure in relatively non-invasive way baseline values of heavy metals in Caretta caretta.

  14. Les effets du travail en equipe dans l'apprentissage par projets sur la motivation des etudiantes et des etudiants en formation des ingenieurs

    NASA Astrophysics Data System (ADS)

    Fernandez, Nicolas

    Les representants des secteurs industriels et les, milieux professionnels en Amerique du Nord reprochaient aux universites de former des ingenieurs avec peu d'experience pratique en resolution de problemes et en conception. Quelques programmes de genie ont alors mis en place le travail en equipe dans l'apprentissage par projets. Beaucoup d'ecrits font valoir les benefices de l'apprentissage par projets sur la motivation des etudiants. Or, ces benefices commencent a peine a faire l'objet de recherches visant a produire des donnees probantes a ce sujet. Les travaux sur la motivation en contexte d'apprentissage et les modeles theoriques developpes sont issus d'environnements d'apprentissage marques par l'enseignement magistral. Le modele de la valeur attendue de la tache (Eccles et Wigfield, 1995; Neuville, 2004) et le modele du systeme-groupe (St-Arnaud, 2008) ont ete retenus pour mesurer les effets du travail en equipe dans l'apprentissage par projets sur la motivation. La recherche visait aussi a approfondir et a nuancer la comprehension de la motivation des etudiants universitaires apprenant en contexte innovant. Les sujets constituent des etudiants (n=100) travaillant sur des projets d'integration au cours des trois sessions initiales du programme de genie mecanique d'une universite canadienne. L'analyse de regression multiple revele que les construits de la motivation expliquent un tiers de la variance de l'engagement academique dans la realisation du projet d'integration. Les perceptions de l' "expectancy", de la valeur intrinseque et utilitaire sont les determinants principaux de l'engagement des etudiants. L'analyse de variance multivariee a mesures repetees indique que la motivation des etudiants pour le travail sur les projets d'integration a augmente au cours des trois sessions initiales du parcours de formation. Finalement, malgre l'absence d'interaction significative entre les variables de motivation et de l'equipe, les reponses des sujets indiquent une

  15. [History of the discussion on ethnic difference at ICH].

    PubMed

    Uchida, Eiji

    2009-02-01

    This paper describes the history of discussions on ethnic differences at the International Conference on Harmonization of technical requirements for registration of pharmaceuticals for human use (ICH). The first part of this paper gives a short outline of the purpose, organization, history, decision making process of the ICH. The ICH process consists of five steps. Step 1: Consensus building by Expert Working Group (EWG); Step 2: Confirmation of six-party consensus; Step 3: Regulatory consultation and discussion; Step 4: Adoption of an ICH harmonized tripartite guideline and Step 5: Implementation. Ethnic factors in the acceptability of foreign clinical data ("Ethnic Difference") was one of the 14 topics on Efficacy. The author being one of the members of ICH-E5 EWG took part in the discussion of Ethnic Difference. The second part of this paper, describes the history of the discussion on this topic (from its inception to the finalization of the guideline) focusing on Step 2. A retrospective survey on individual pharmacokinetic data of around 80 drugs approved or under development in the 3 regions was conducted. In drafts 2 and 3, acceptance of phase 1 study only was discussed. But the proposal was opposed by industry members from US and EU. In drafts 4 and 5, the concept of "triage" was introduced and several algorithms were proposed, but finally a consensus could not be reached because the proposal was not so pragmatic. In drafts 7 and 8, the concept of "bridging study" was discussed to solve the problem of conducting phase II and III studies. Again, a consensus could not be reached. After the discussion of the "complete clinical data package" as proposed in drafts 9-12, the bridging study was once again discussed in drafts 13-19. Finally, draft 20 was confirmed and the discussion then moved to Step 3.

  16. Federal official discusses reform. Interview by Debra Mamorsky.

    PubMed

    Vladeck, B C

    1993-01-01

    The administrator of the Health Care Financing Administration discusses managed competition, the cost concerns of small and large employers under such a program, and what benefits managers must do in response to health care reform.

  17. [Discussion on English translation of TCM gynecologic terms].

    PubMed

    Jiang, Kun; Han, Bing; Wang, Kui

    2008-01-01

    The existent problems, principles that should be observed and methods for English translation of TCM gynecological terms were discussed, and a scheme of translation for 150 TCM gynecological terms was explored.

  18. Discussions on the Cancellation Effect on a Circular Orbit

    SciTech Connect

    Rui Li; Ya. S. Derbenev

    2005-05-01

    In this study, we discuss some controversial points raised concerning the cancellation effect for transverse dynamics on a curved orbit, and show how they can be perceived from the view point of the cancellation picture.

  19. ECONOMIC DEVELOPMENT PLANNING AND INFORMATION SYSTEMS: A DISCUSSION AND BIBLIOGRAPHY,

    DTIC Science & Technology

    The first part of the report discusses the possible applications of computer based information systems in economics of development planning, with...planning, including some relevant literature in computer based modeling techniques and information systems . (Author)

  20. Mindfulness and discussing "thorny" issues in the classroom

    NASA Astrophysics Data System (ADS)

    Alexakos, Konstantinos; Pride, Leah D.; Amat, Arnau; Tsetsakos, Panagiota; Lee, Kristi J.; Paylor-Smith, Christian; Zapata, Corinna; Wright, Shequana; Smith, Theila

    2016-09-01

    Being in the moment, showing compassion, being non-judgmental, acknowledging deep emotional challenges without getting stuck: these are mindfulness characteristics important to us as teachers, yet not often included in teacher preparation. These concerns become magnified when we focus on difficult knowledge and thorny issues, like topics related to gender and race. Using a sociocultural framework, we address how mindfulness, heuristics, and other contemplative practices can be adopted to create safe, supporting, and healing spaces for such complex, often emotionally painful discussions. Participant narratives are used extensively to provide a voice to those marginalized or hurt. Drawing from these narratives and their experience in discussing thorny issues, we put forth possible solutions and interventions that can create spaces that encourage and support critical discourse through mindful practices. The development of a heuristic for discussing thorny issues whose characteristics can be adopted by interested teachers and educators to help frame and mediate this type of difficult discussion is an outcome of this research.

  1. Discussing Animal Rights and Animal Research in the Classroom.

    ERIC Educational Resources Information Center

    Herzog, Harold A.

    1990-01-01

    Reviews two prominent philosophical justifications for animal liberation and describes a simulation that facilitates class discussion of animal research issues. Students reported that the exercise increased their awareness of the issues and of the complexity of making ethical decisions. (DB)

  2. Talking about history: discussions in a middle school inclusive classroom.

    PubMed

    Okolo, Cynthia M; Ferretti, Ralph P; MacArthur, Charles A

    2007-01-01

    In this study, we examined the nature of whole-class discussion and teachers' instruction during discussion about historical topics in one inclusive, middle-grade classroom. We videotaped and analyzed 4 lessons to determine the nature of discussion sequences, rates of participation, and instructional challenges encountered by the teacher and students. We triangulated our analysis of observational data with teacher interviews. The results showed high rates of student participation, with no differences between students with and without disabilities. The teacher initiated and controlled the discussion, and nearly all student responses were from teacher to student rather than from student to student. The teacher encountered three challenges in developing students' understanding, and we identify specific practices she used to address these challenges. Based on students' response to measures administered by project staff and on their scores on statewide tests, this teacher's practices seemed to be highly effective.

  3. Workshop to discuss NRC 2014 Recommendations for IRIS

    EPA Pesticide Factsheets

    EPA is holding a public workshop to discuss some specific recommendations from the National Academies' National Research Council's May 2014 report on further improving the scientific quality of IRIS assessments.

  4. Using Context Variety and Students' Discussions in Recognizing Statistical Situations

    ERIC Educational Resources Information Center

    Silva, José Luis Ángel Rodríguez; Aguilar, Mario Sánchez

    2016-01-01

    We present a proposal for helping students to cope with statistical word problems related to the classification of different cases of confidence intervals. The proposal promotes an environment where students can explicitly discuss the reasons underlying their classification of cases.

  5. Pretest online discussion groups to augment teaching and learning.

    PubMed

    Kuhn, Jonathan; Hasbargen, Barbara; Miziniak, Halina

    2010-01-01

    Tests and final examination scores of three semesters of control students in a nursing foundation course were compared with tests and final examination scores of three semesters of participating students. Participating students were offered access to an asynchronous pretest online discussion activity with a faculty e-moderator. While the simplified Bloom's revised taxonomy assisted in creating appropriate preparatory test and final examination questions for pretest online discussion, Salmon's five-stage online method provided direction to the e-moderator on how to encourage students to achieve Bloom's higher-order thinking skills during the pretest online discussions. Statistical analysis showed the pretest online discussion activity had a generally positive impact on tests and final examination scores, when controlling for a number of possible confounding variables, including instructor, cumulative grade point average, age, and credit hours.

  6. 25 CFR 1000.225 - Are meetings or discussions mandatory?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FUNDING AGREEMENTS UNDER THE TRIBAL SELF-GOVERNMENT ACT AMENDMENTS TO THE INDIAN SELF-DETERMINATION AND EDUCATION ACT Waiver of Regulations § 1000.225 Are meetings or discussions mandatory? No, a meeting with...

  7. 25 CFR 1000.225 - Are meetings or discussions mandatory?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FUNDING AGREEMENTS UNDER THE TRIBAL SELF-GOVERNMENT ACT AMENDMENTS TO THE INDIAN SELF-DETERMINATION AND EDUCATION ACT Waiver of Regulations § 1000.225 Are meetings or discussions mandatory? No, a meeting with...

  8. 25 CFR 1000.225 - Are meetings or discussions mandatory?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... FUNDING AGREEMENTS UNDER THE TRIBAL SELF-GOVERNMENT ACT AMENDMENTS TO THE INDIAN SELF-DETERMINATION AND EDUCATION ACT Waiver of Regulations § 1000.225 Are meetings or discussions mandatory? No, a meeting with...

  9. 25 CFR 1000.225 - Are meetings or discussions mandatory?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FUNDING AGREEMENTS UNDER THE TRIBAL SELF-GOVERNMENT ACT AMENDMENTS TO THE INDIAN SELF-DETERMINATION AND EDUCATION ACT Waiver of Regulations § 1000.225 Are meetings or discussions mandatory? No, a meeting with...

  10. IRIS Toxicological Review of Trichloroethylene (Interagency Science Discussion Draft)

    EPA Science Inventory

    EPA is releasing the draft report, Toxicological Review of Trichloroethylene, that was distributed to Federal agencies and White House Offices for comment during the Science Discussion step of the IRIS Assessment Development Process. Comments received from other Federal agencies ...

  11. PNNL Expert Doug McMakin Discusses Millimeter Wave Technology

    SciTech Connect

    Doug McMakin

    2011-10-01

    Electrical Engineer Doug McMakin discusses Millimeter Wave Holographic technology, which uses non-harmful, ultrahigh-frequency radio waves to penetrate clothing to detect and identify concealed objects, as well as obtain accurate body measurements.

  12. Cochlear Macro- and Micromechanics—A Moderated Discussion

    NASA Astrophysics Data System (ADS)

    Dong, Wei; Ruggero, Mario A.

    2011-11-01

    A discussion moderated by the authors on the topic "Cochlear Macro- and Micromechanics" was held on 19 July 2011 at the 11th International Mechanics of Hearing Workshop in Williamstown, Massachusetts. The paper provides an edited transcript of the session.

  13. Are You Ready To Discuss IT Outsourcing on Your Campus?

    ERIC Educational Resources Information Center

    McCord, Alan

    2002-01-01

    Explores why the idea of outsourcing campus information technology (IT) services rouses opinions and passions best handled by informed dialogue. Discusses how to conduct this dialog, including common myths about outsourcing and useful lessons. (EV)

  14. Hits and Misses: Kirby on the Selection Task. Discussion.

    ERIC Educational Resources Information Center

    Over, D. E.; Evans, J. St. B. T.

    1994-01-01

    Discusses Kris N. Kirby's work on signal detection theory and its application to Watson's selection task. Identifies problems with the design and interpretation of Kirby's card-selection experiments. (DR)

  15. PNNL Expert Doug McMakin Discusses Millimeter Wave Technology

    ScienceCinema

    Doug McMakin

    2016-07-12

    Electrical Engineer Doug McMakin discusses Millimeter Wave Holographic technology, which uses non-harmful, ultrahigh-frequency radio waves to penetrate clothing to detect and identify concealed objects, as well as obtain accurate body measurements.

  16. Discussion of "Biomedical informatics: we are what we publish".

    PubMed

    Geissbuhler, A; Hammond, W E; Hasman, A; Hussein, R; Koppel, R; Kulikowski, C A; Maojo, V; Martin-Sanchez, F; Moorman, P W; Moura, L A; de Quirós, F G B; Schuemie, M J; Smith, B; Talmon, J

    2013-01-01

    This article is part of a For-Discussion-Section of Methods of Information in Medicine about the paper "Biomedical Informatics: We Are What We Publish", written by Peter L. Elkin, Steven H. Brown, and Graham Wright. It is introduced by an editorial. This article contains the combined commentaries invited to independently comment on the Elkin et al. paper. In subsequent issues the discussion can continue through letters to the editor.

  17. A discussion on adding broadcast data on BPL channel

    NASA Astrophysics Data System (ADS)

    Wu, Hai-Tao; Bian, Yu-Jing

    2001-06-01

    The shortcoming of current Loran-C for timing is analyzed in this paper, and the main objective of realizing broadcast on BPL data channel is presented, too. The structure of various possible data information is discussed, the calculation methods and formulae for some important parameters and data are given. The selection of data for broadcasting depends on the expected function of BPL, and the data layout is related to the technique adopted. Finally, the data rates for different modulation schemes are discussed.

  18. Synopsis of discussion session on physicochemical factors affecting toxicity

    USGS Publications Warehouse

    Erickson, R.J.; Bills, T.D.; Clark, J.R.; Hansen, D.J.; Knezovich, J.; Hamelink, J.L.; Landrum, P.F.; Bergman, H.L.; Benson, W.H.

    1994-01-01

    The paper documents the workshop discussion regarding the role of these factors in altering toxicity. For each factor, the nature, magnitude, and uncertainty of its empirical relation to the toxicity of various chemicals or chemical classes is discussed. Limitations in the empirical database regarding the variety of species and endpoints tested were addressed. Possible mechanisms underlying the empirical relations are identified. Finally, research needed to better understand these effects is identified.

  19. China’s National Defense in 2008: Panel Discussion Report

    DTIC Science & Technology

    2009-05-01

    current global financial crisis is said to have been "triggered by the U.S. subprime mortgage crisis." China’s national security interests are... crises and wars." Using wording similar to that in the 2006 White Paper, this edition emphasizes "building a lean and effective deterrent force and...discussion of expanded national security interests and the consequent need for expanded military capabilities (discussed previously) might, indeed

  20. Enhancing reliability in portfolio assessment: discussions between assessors.

    PubMed

    Pitts, John; Coles, Colin; Thomas, Peter; Smith, Frank

    2002-03-01

    This paper reports the reliability in assessments of a series of portfolios assembled by a cohort of participants attending a course for prospective general practice trainers. Initial individual assessments are compared with open discussion between random pairs of assessors to produce paired composite scores, and analysed using kappa statistics. Overall reliability of a global pass/refer judgement improved from a kappa of 0.26 (fair) using individual assessment, to 0.5 (moderate) with paired discussants.

  1. Discussion of "Computational Electrocardiography: Revisiting Holter ECG Monitoring".

    PubMed

    Baumgartner, Christian; Caiani, Enrico G; Dickhaus, Hartmut; Kulikowski, Casimir A; Schiecke, Karin; van Bemmel, Jan H; Witte, Herbert

    2016-08-05

    This article is part of a For-Discussion-Section of Methods of Information in Medicine about the paper "Computational Electrocardiography: Revisiting Holter ECG Monitoring" written by Thomas M. Deserno and Nikolaus Marx. It is introduced by an editorial. This article contains the combined commentaries invited to independently comment on the paper of Deserno and Marx. In subsequent issues the discussion can continue through letters to the editor.

  2. Developing a tool for analysis of recorded appraisal discussions.

    PubMed

    Rowlands, Mark; Rees, Lynne

    2011-07-01

    Appraisal in Wales is organised and quality assured through Cardiff University on behalf of the Local Health Boards. This has enabled the development of a standardised and consistent appraisal experience for GPs in Wales. Central to this is regular feedback to all GP appraisers from their line managers, their appraisal co-ordinator, about their work and especially the quality of the Form 4 document (the appraisal summary). Included is feedback about GP experience of the appraisal process, including the appraisal discussion. Presently there are no methods of directly assessing the quality of the appraisal discussion. The authors, who are both appraisal co-ordinators (ACs), have developed a method of assessing the quality of a recording of a real appraisal discussion. The information gathered from this assessment has been used in a facilitative style to feedback to the appraiser to acknowledge their skills in the appraisal discussion and to identify areas for development. This paper describes the work done to create an appraisal discussion assessment method (ADAM), and suggestions about how to use it. Using a Delphi approach, we have developed descriptors to aid formative assessment of the appraisal discussion.

  3. Creating discussions with classroom voting in linear algebra

    NASA Astrophysics Data System (ADS)

    Cline, Kelly; Zullo, Holly; Duncan, Jonathan; Stewart, Ann; Snipes, Marie

    2013-12-01

    We present a study of classroom voting in linear algebra, in which the instructors posed multiple-choice questions to the class and then allowed a few minutes for consideration and small-group discussion. After each student in the class voted on the correct answer using a classroom response system, a set of clickers, the instructor then guided a class-wide discussion of the results. We recorded the percentage of students voting for each option on each question used in 18 sections of linear algebra, taught by 10 instructors, at 8 institutions, over the course of 5 years, together recording the results of 781 votes on a collection of 311 questions. To find the questions most likely to provoke significant discussions, we identify the six questions for which votes were most broadly distributed. Here we present these questions, we discuss how we used them to advance student learning, and we discuss the common features of these questions, to identify why they were so good at stimulating discussions.

  4. Shaping stereotypical behaviour through the discussion of social stereotypes.

    PubMed

    Smith, Laura G E; Postmes, Tom

    2011-03-01

    In two studies, we demonstrate that small group discussions change the extent to which an activated stereotype affects performance in a relevant domain. In Study 1, female participants were asked why men are (or are not) better than them at maths. They generated their answers individually or through group discussion, and their subsequent maths performance was highest when they collectively challenged the stereotype and lowest when they collectively affirmed the stereotype. When participants affirmed the stereotype through discussion, they used more theories which supported the validity of the stereotype, compared to the individual thought condition; and consensus mediated the effect of group discussion on performance (relative to individual rumination). In Study 2, male and female participants affirmed or challenged the stereotype in same-gender discussion groups. After affirming the stereotype, women's performance decreased relative to their baseline scores and men's performance was 'lifted'. In contrast, when they challenged the stereotype, there was no difference between the performance of men and women on the maths test. This pattern of effects was mediated by confidence in mathematical ability. The findings support the idea that topical small group discussions can, in the short term, differentially alter the impact that stereotypes have on performance.

  5. Coastal dynamics off Cabo Pulmo, Baja California Sur, México

    NASA Astrophysics Data System (ADS)

    Trasviña-Castro, A.; Gonzalez-Rodriguez, E.; Zaitsev, O. V.

    2013-05-01

    Cabo Pulmo is the one of the few coral reefs of the Mexican Pacific. It is located to the north of the Tropic of Cancer (at 23.5° N) and therefore formally in the subtropical region. It is part of the Gulf of California but its location near the tip of the Peninsula pose questions about the exchange of properties with the neighboring Pacific Ocean, some of which will be addressed here. It was declared National Park in 1995. Since then it became a no-take zone and a nature reserve for the preservation of the large variety of species found there. We report results based on meteorological and hydrographic observations as well as current measurements gathered between October 2010 and February 2012. These results include the presence of coastal currents forced by the tide, the wind and remote forcing. We believe the latter are associated, sometimes, to the mesoscale circulation of the entrance to the Gulf of California and, at other times, to coastal jets coming from the interior of the Gulf. We use displacement diagrams to discuss the trends of the residual circulation along the coast. During autumn, winter and even in spring the residual coastal flow is towards the Equator. This is attributed to the influence of the Northwesterly winds that blow over the Gulf of California in these months. It is in summer that the coastal residual circulation exhibits a poleward component being more intense during Southeasterly wind events. Finally, we present evidence of coastal exchange with the Pacific Ocean in the form of an intense jet. This coastal jet flows equatorward past Cabo Pulmo, continues towards the Pacific side of the Peninsula and generates offshore filaments when turning the cape.

  6. Scaffolding scientific discussion using socially relevant representations in networked multimedia

    NASA Astrophysics Data System (ADS)

    Hoadley, Christopher M.

    1999-11-01

    How do students make use of social cues when learning on the computer? This work examines how students in a middle-school science course learned through on-line peer discussion. Cognitive accounts of collaboration stress interacting with ideas, while socially situated accounts stress the interpersonal context. The design of electronic environments allows investigation into the interrelation of cognitive and social dimensions. I use on-line peer discussion to investigate how socially relevant representations in interfaces can aid learning. First, I identify some of the variables that affect individual participation in on-line discussion, including interface features. Individual participation is predicted by student attitudes towards learning from peers. Second, I describe the range of group outcomes for these on-line discussions. There is a large effect of discussion group on learning outcomes which is not reducible to group composition or gross measures of group process. Third, I characterize how students (individually) construct understanding from these group discussions. Learning in the on-line discussions is shown to be a result of sustained interaction over time, not merely encountering or expressing ideas. Experimental manipulations in the types of social cues available to students suggest that many students do use socially relevant representations to support their understanding of multiple viewpoints and science reasoning. Personalizing scientific disputes can afford reflection on the nature of scientific discovery and advance. While there are many individual differences in how social representations are used by students in learning, overall learning benefits for certain social representations can be shown. This work has profound implications for design of collaborative instructional methods, equitable access to science learning, design of instructional technology, and understanding of learning and cognition in social settings.

  7. Frequency of Faith and Spirituality Discussion in Health Care.

    PubMed

    Bergamo, David; White, Dawn

    2016-04-01

    Faith and spirituality are important in the lives of many individuals, and therefore, many patients. This study was performed to determine whether faith and spirituality are active part of the healthcare field and patients' receipt of these sometimes delicate topics. The nuances of the concepts of faith, spirituality, and religion and their implications in the healthcare setting are discussed. Benefits and detriments of faith and spirituality are reviewed in terms of how they relate to the health of the patient and to the healthcare field. With the focus of healthcare shifting to holistic care, this conversation may be more necessary than ever in practice, yet it seems many providers are not discussing these matters with patients. The study analyzes whether healthcare providers are discussing these topics with patients and how the discussion is received or would be received by patients. Findings demonstrate the infrequency of the discussion regardless of the fact that the majority of patients consider themselves faithful or spiritual. This study was approved by the Clarkson University Institutional Review Board on June 18, 2104.

  8. Boron and strontium isotope compositions of groundwater from the La Paz arid coastal aquifer, Baja California Sur, Mexico

    NASA Astrophysics Data System (ADS)

    Mahlknecht, Jürgen; Rosner, Martin; Meixner, Anette

    2016-04-01

    In groundwater studies boron and strontium isotopic compositions can be used to identify natural and anthropogenic sources as well as processes related to groundwater recharge, flow and mixing. The La Paz arid costal aquifer in Baja California Sur, Mexico, is the most important source of drinking and irrigation water for La Paz area and suffers from anthropogenic contamination and intensive exploitation of the aquifer causing seawater intrusion and general groundwater abatement. The relatively un-radiogenic 87Sr/86Sr isotope ratios of the La Paz groundwater range in a narrow field between 0.7054 and 0.7062. In contrast to strontium the boron isotope composition displays a large variability between +27 and +55 permil d11B. The relatively low 87Sr/86Sr ratios of the La Paz groundwater highlight a significant contribution of strontium derived from local terrestrial sediments and igneous rocks with known 87Sr/86Sr ratios between 0.705 and 0.7035. The large variability of d11B values indicate that multiple sources and processes determine the boron isotope composition of La Paz groundwater. Rainwater (high d11B), seawater (~+40 permil) due to seawater intrusions, wastewater (low to medium d11B) and boron derived from the local geology (low to medium d11B) explain most of the observed groundwater d11B variability. However, d11B values higher than modern seawater point to significant boron isotope fractionation by preferential absorption of 10B onto clay minerals during the evolution of some groundwater samples. Due to low boron concentrations in rainwater a significant contribution of 11B-rich rainwater (>+40 permil) on the La Paz groundwater is unlikely.

  9. K-Ar ages confirm Pliocene age for oldest Neogene marine strata near Loreto, Baja California Sur, Mexico

    SciTech Connect

    McLean, H.

    1987-05-01

    Beds of pumiceous tuff interbedded with mollusk-rich sedimentary rocks provide new age constraints on the timing of the late Neogene subsidence and marine transgression a few kilometers north of Loreto, Baja California Sur, Mexico. The lower part of the Neogene section consists of approximately 1500 m of early to middle Miocene nonmarine volcanic-derived sandstone, breccia, and porphyritic andesite and dacite lavas, called the Comondu Formation or Comondu Group by previous workers. The Miocene rocks are unconformably overlain by nearly 1000 m of predominantly marine sandstone, siltstone, conglomerate, coquina, and tuff of Pliocene age. This 1000-m section grades upward from unfossiliferous fanglomerate, sandstone, and pelitic red beds that are interpreted to be nonmarine into mollusk-rich marine strata; this sequence indicates that marine transgression occurred within the Pliocene section. Plagioclase and hornblende from three pumiceous tuff beds stratigraphically located near the base, middle, and top of the marine section yield K-Ar ages of 3.2, 1.9, and 1.8 Ma, respectively; these ages are similar to Pliocene ages indicated by reconnaissance studies of ostracods, diatoms, and foraminifers. The diatoms indicate open-ocean waters and the foraminifers indicate outer shelf depth. Ostracods, oysters, pectens, and other fossil bivalves seem to indicate a shallow-water embayment. Lateral distribution of nonmarine and marine facies suggests a paleoenvironment in which alluvial fans fed coarse debris into a series of coastal fan deltas. The Pliocene basin may have been a largely landlocked embayment similar to the modern Bahia Concepcion, located 70 km north of Loreto. Marine and volcanic rocks are assumed to be associated with the opening of the Gulf of California. If this assumption is correct, the beds near Loreto suggest that the opening occurred during the Pliocene.

  10. Seasonal diet composition of Fundulus lima (Cyprinodontiformes: Fundulidae) in two oasis systems of Baja California Sur, Mexico.

    PubMed

    Acosta Zamorano, Dinora; Ruiz Campos, Gorgonio; Andreu Soler, Asunción; Reyes Valdez, Claudia Alejandra

    2011-12-01

    Fundulus lima inhabits river drainage systems and is threatened after the introduction of cichlids in the area. To support conservation programs, the spatial and temporal variation of the diet composition of this endangered killifish, was determined in two oasis systems of Baja California Sur, Mexico (San Ignacio and La Purisima river drainages), during rainy and dry seasons. F. lima was captured by using passive and active capture techniques. A total of 192 stomach contents of F. lima was analyzed. The contribution of each prey item in the diet composition was quantified by means of the indices of occurrence frequency (% OF), numerical (% N) and volume (% V) percentages. The relative importance of each prey item was determined according to the percentage of the Relative Importance Index (% RII). The similarity of the diet was calculated between hydrological basins (populations combined by basin), seasons (rainy versus dry months), sexes and size classes, by using Schoener's resource overlap index. We used two ecological indices to determine the type of feeding strategy exhibited by the fish: (1) niche breadth of Levins and (2) proportional similarity of Feisinger. Sand was the most abundant item in the stomach content of killifishes from both drainages (39% and 47%, respectively). Diet composition was similar for both drainages (74%) as well as among their respective size classes; however, it was different between sexes. In both drainages, F. lima predated mainly on diatom algae, dipterous and trichopteran larvae, and fish scales during the dry season; while it preferred dipterous larvae, filamentous algae and ostracods in the rainy season. A feeding strategy of opportunist type was exhibited by F. lima during the rainy season, changing to specialist type during the dry season. This information will be the basis for future investigations related to the conservation of this endangered species and its habitat.

  11. Intraspecific crossings of Undaria pinnatifida (Harv.) Sur.—A possible time-saving way of strain selection

    NASA Astrophysics Data System (ADS)

    Pang, Shao-Jun; Hu, Xiao-Yan; Wu, Chao-Yuan; Hirosawa, A.; Ohno, M.

    1997-09-01

    Unicellular gametophytes of Undaria pinnatifida (Harv.) Sur. were isolated in Qingdao, P. R. China in April 1993 and in Tokushima, southern Japan in March 1995. Different intraspecific crossings by using unicellular male and female gametophytes were successfully undertaken in Sept. of 1995 in Qingdao. Sporophytes were transplanted to two different locations for open sea cultivation. One was at Zhanqiao (ZQ) Bay where the water current was slower than that of another location—Taipingjiao(TPJ). A total of 218 adult sporophytes were harvested on January 12 and 18 from TPJ and ZQ respectively. For eacn combination, 10 sporophytes were cultivated. Analysis of the morphological characteristics of adult sporophytes indicated that the longest length between two bases of the serration of pinnate blades (W2) is a morphological characteristic that can be transferred from the parent plant to the next generations regardless of environmental variations. There was evidence that W2 was apparently determined by sex-linked factors, i.e., by male parental gametophyte. Sporophytes from certain crossing combinations showed more vigorous growth than those from other crossing combinations. It is therefore possible to select gametophyte strains which can be used as parental gametophytes for the seedling production of sporophytes with more vigorous growth within shorter cultivation period. The morphology of hybrids from a Qingdao strain and a Tokushima cultivated strain resembled that of both parental plants in frond features (wrinkled or smooth) and W2. Sporophyll formation also varied with strains. The fact that adult sporophytes resulting from the same crossing combinations have identical morphological characteristics under the same environmental conditions indicates the possibility of a new way to select strains which are expected to be ideal for commerical production by purposely selecting, propagating, and seeding unicellular gametophytes for sporeling production through freeliving

  12. Hydrogeochemical characterization of the thermal springs in northeastern of Los Cabos Block, Baja California Sur, México.

    PubMed

    Hernández-Morales, Pablo; Wurl, Jobst

    2016-11-19

    The existence of hot springs in the northeastern part of Los Cabos Baja California Sur (BCS), is known from pre-Hispanic times, but their hydrochemical composition had not been previously described. Several springs are located within the watershed of Santiago, and the objective of this study was to define the hydrogeochemical composition of the thermal springs and to characterize the geothermal reservoir. A total of 16 water samples were taken in 11 geothermal manifestations under dry (June 2014) and humid (March 2015) conditions. A geothermal system of low enthalpy and low mineralization was found along the San José del Cabo Fault (FSJC), with an average salinity (TDS) of 261 mg/L and an alkaline pH (8.5-9.5). The hydrogeochemical composition corresponds to the sodium-bicarbonate type, and geothermometers (silica and Na-K) indicate temperatures ranging from 70 to 115 °C for the deep thermal reservoir in conditions of equilibrium. The thermal springs with these hydrogeochemical characteristics differ in respect to the hydrochemical composition of the springs, formally described on several sites of BCS. Br/Cl and B/Cl ratios as well as the enrichment factor (EF) indicate that rainwater with a seawater component represents the source of the thermal spring water. In the springs, a mixture between thermal water and surface water is observed, combined with a relatively deep water circulation, allowing a calcium-sodium exchange, according to the host rock geochemistry. The higher temperatures found at some hot springs are related to the main trace of the San José del Cabo Fault.

  13. Considérations nosographiques sur le délire d'infestation parasitaire à travers trois observations cliniques

    PubMed Central

    Berhili, Nabil; Bout, Amine; Hlal, Hayat; Aarab, Chadya; Aalouane, Rachid; Rammouz, Ismail

    2016-01-01

    Le syndrome d'Ekbom, ou délire d'infestation parasitaire, est une pathologie rare, caractérisée par la conviction inébranlable d'avoir une peau infestée d'insectes ou de parasites. Il s'agit d'un délire monothématique à mécanisme hallucinatoire qui touche typiquement les femmes d’âge avancé. Nous rapportons les cas de trois patients qui présentent un délire d'infestation parasitaire dans des contextes cliniques différents. Le premier patient souffre d'un délire d'infestation isolé correspondant à la forme décrite par Karl Ekbom. Le deuxième cas présente un délire d'infestation secondaire, s'inscrivant dans le cadre d'une leuco-encéphalopathie de type CADASIL. Enfin, le troisième patient se présente dans un tableau évocateur d'un épisode dépressif avec une caractéristique psychotique qui intègre le délire d'infestation. Ces trois vignettes cliniques illustrent parfaitement le caractère trans-nosographique de ce syndrome ainsi que les difficultés de prise en charge de ces patients, tant au niveau de l'alliance thérapeutique que sur le plan des choix en matière de traitement pharmacologiques. PMID:27642468

  14. Turbulent premixed combustion; Further discussions on the scales of fluctuations

    SciTech Connect

    Borghi, R. )

    1990-06-01

    The prediction of turbulent combustion is classically performed by numerical integration of modeled equations. For each existing approach, a crucial quantity is a time scale for the destruction of temperature (or concentration) fluctuations. Usually, this time scale is simply taken as proportional to the corresponding time scale for velocity fluctuations, but the question of the influence of the reaction on this scale arises, and has already been discussed. The authors discuss this point in the particular case of wrinkled premixed flames. Algebraic closure formulas, as well as closures based on the so-called {epsilon}{sub y} equation, or on the equation for the flame surface by unit of volume of Marble and Broadwell, are proposed and discussed. It is found, in particular, that in the case of wrinkled flames with infinite Damkohler and Reynolds numbers the reaction does not play any direct role on the time scale.

  15. Communique: Special Issue on the International Network for Cooperation in Northern Science Created at a Meeting held in Edmonton, Alberta (October 12-15, 1982). Summary of Discussions and Agreements Reached = Numero special sur le Reseau Scientifique Internationale pour le Nord cree a la reunion tenue a Edmonton, Alberta (du 12 au 15 octobre 1982). Resume des discussions et accords conclus.

    ERIC Educational Resources Information Center

    Communique, 1983

    1983-01-01

    Delegations from Canada, Finland, Greenland, Norway, Sweden, and the United States agreed to the establishment of a network for cooperation among individuals engaged in problems peculiar to the circumpolar North. The Northern Science Network, established within the Unesco Man and the Biosphere Program, consists of three themes: studies on the…

  16. The pioneer woman's view of migraine: Elizabeth Garrett Anderson's thesis "Sur la migraine".

    PubMed

    Wilkinson, M; Isler, H

    1999-01-01

    translate it but, after discussion, we decided on a joint effort (95% of the translation is by M.W.; very few details were changed, and some footnotes added for better understanding). We think that E.G.A.'s text is a classic, showing profound understanding, sound practical advice, and also, in its theoretical part, the limits of neurophysiological knowledge in Paris when Brown-Sequard was "charge des cours" there. We may add that in her various examinations she had to answer questions, in French, on the use of footprints by the police, the general nature of fishes, toxic fishes, electric fishes, cod liver oil, and the secretion of tears. She earned much applause from the public, which consisted of male French students, and the overt appreciation of Paul Broca, head examiner, and Dr Wurtz, the Dean of the Faculte de Médecine. The impact of her thesis in the 19th century was modest. It appears to be rather marginal in the German literature of the early 20th century, but it has imprinted the management of migraine at the City of London Migraine Clinic in the last thirty years. The importance of nutrition, regular meals, regular habits, the need to supplement analgesics with antiemetics, and the treatment of the attack with rest, and great quantities of hot tea, were certainly related to E.G.A.'s doctrine. The internationally prevailing recommendation to give antiemetics, and then only analgesics, as well as the combination of both in one tablet, may thus be traced back to E.G.A. via the teachings of M.W. and Nat Blau.

  17. Etudes sur la gravitation: Theories alternatives en 2+1 et 3+1 dimensions

    NASA Astrophysics Data System (ADS)

    Edery, Ariel

    to study a 2 + 1 dimensional model. However, in 2 + 1 dimensions, the analog to Einstein gravity is trivial. The space-time outside sources is flat and particles at rest do not interact. The odd dimensional space-time allows one to include a gravitational Chern-Simons term called a topological mass term because it gives mass to the graviton. In article three and four, we consider localized mass and spin sources in the full non-linear theory. We obtain solutions for both of Vuorio's sectors. In article 3 we demonstrate that delta function sources, while allowed in the linearized theory are not consistent with the full non-linear field equations. In article four, we consider how to embed point sources in Vuorio's cosmological sector and discuss the metric solution for the case when observers are near and far away from the source. (Abstract shortened by UMI.)

  18. What Asexuality Contributes to the Same-Sex Marriage Discussion.

    PubMed

    Scherrer, Kristin S

    2010-01-01

    While same-sex marriage debates have captured public attention, it is but one component of a broader discussion regarding the role of marriage in a changing society. To inform this discussion, I draw on qualitative, Internet survey data from 102 self-identified asexual individuals. I find that asexual relationships are complicated and nuanced in ways that have implications for a GLBTQ political agenda, including same-sex marriage recognition. In addition, findings indicate that assumptions of sex and sexuality in relationships are problematic and that present language for describing relationships is limiting. Findings suggest a social justice agenda for marginalized sexualities should be broader in scope than same-sex marriage.

  19. Discussing Adolescent Sexual Health in African American Churches

    PubMed Central

    Williams, Terrinieka T.; Dodd, Darcy; Campbell, Bettina; Pichon, Latrice C.; Griffith, Derek M.

    2012-01-01

    This study describes the ways in which two African American churches discuss adolescent sexual health topics. Six focus groups were conducted in two churches in Flint, Michigan that reported no formal sexual health programming for their congregants. Three themes emerged to highlight the different perspectives about the role of churches in adolescent sexual decision-making and sexual health education 1) churches as sources of sexual information; 2) churches as complex communities; and 3) recommendations for sexual education in churches. Participant responses suggest that churches can and should serve a resource for sexual health information. Implications for practice and research are discussed. PMID:22814618

  20. LANL Researcher Roger Wiens Discusses ChemCam

    ScienceCinema

    Wiens, Roger

    2016-07-12

    Discussion of the ChemCam instrument on the Curiosity Rover that occurred during the NASA press conference prior to launch of the Mars Science Laboratory. The ChemCam instrument was developed by Los Alamos National Laboratory and the French Space Institute. Los Alamos National Laboratory researcher Roger Wiens discusses the instrument on this video. ChemCam uses a laser to "zap" features of the Martian landscape and then uses a spectrometer to gather information about the composition of the sample. ChemCam will help the Curiosity Rover determine whether Mars is or was habitable. The Rover is expected to touch down on the Red Planet on August 5, 2012.

  1. LANL Researcher Roger Wiens Discusses ChemCam

    SciTech Connect

    Wiens, Roger

    2012-02-15

    Discussion of the ChemCam instrument on the Curiosity Rover that occurred during the NASA press conference prior to launch of the Mars Science Laboratory. The ChemCam instrument was developed by Los Alamos National Laboratory and the French Space Institute. Los Alamos National Laboratory researcher Roger Wiens discusses the instrument on this video. ChemCam uses a laser to "zap" features of the Martian landscape and then uses a spectrometer to gather information about the composition of the sample. ChemCam will help the Curiosity Rover determine whether Mars is or was habitable. The Rover is expected to touch down on the Red Planet on August 5, 2012.

  2. A concise discussion of headache types, Part 1.

    PubMed

    Williams, LaVonn A

    2012-01-01

    Except for head colds, headaches are probably the most common human ailment, and historical evidence supports the fact that earlier man suffered from ailments of the head. With over 150 diagnostic headache categories having been established, the diagnosis and treatment of headache is not a simple process. The severity, symptoms, and causes of headache vary. This article, which is Part 1 of a three-part article, provides a concise discussion about the types of headache, as well as brief discussions on some of the causes and treatments of headache.

  3. Discussion and Adoption of the New CIRA - Introduction

    NASA Astrophysics Data System (ADS)

    Rees, David; Bowman, Bruce; Vaughan, William

    This is an introduction to the series of Solicited Review Talks to be pressented within this Meeting on the Discussion and Adoption of hte New CIRA. It also reviews the necessary discussion required to allow the C4.2 Meeting to recommend adoption of the New CIRA to Commission C of COSPAR and also to URSI. This may include additional activities that may be necessary to demonstrate the validation of the new Models, the limits of the currentlyavailable Models, and the likely further stages stages of developments through which future improvements may be possible.

  4. Discussion on copy constructor in C++ programming language

    NASA Astrophysics Data System (ADS)

    Luo, Fafen; Du, Ruiqing

    2011-12-01

    C++ is a widely used object-orientated programming language in the software industry. The purpose of this paper is to discuss concept and application of the copy constructor, a special constructor in C++. As fundamental knowledge, constructor and destructor were introduced at first. Several examples of copy constructor were presented to illustrate concept of copy constructor and its use. Shallow copy and deep copy were also presented. After discussions on copy constructor by analyzing all the examples of copy constructor, the conclusion was made about that how to define a copy constructor and how to use it properly.

  5. Effets potentiels d’un modèle rationnel de prescription sur les dépenses nationales en santé

    PubMed Central

    Littman, Jordan; Halil, Roland

    2016-01-01

    Résumé Objectif Estimer les économies que pourrait engendrer la mise en œuvre d’un modèle rationnel de prescription pour des classes de médicaments équivalents sur les plans de l’efficacité, de la toxicité et de la commodité. Conception L’Institut canadien d’information sur la santé a fourni des renseignements sur les 10 principales classes de médicaments en fonction des dépenses annuelles qui leur sont attribuables. Ces classes ont été examinées en vue de leur inclusion potentielle dans l’étude selon qu’il était possible de comparer les médicaments à l’intérieur d’une même classe. Lorsqu’à la suite d’une recherche documentaire, une équivalence a été établie en fonction de l’efficacité, de la toxicité et de la commodité des médicaments, les données annuelles sur les prescriptions ont été recueillies à partir de la base de données du Système national d’information sur l’utilisation des médicaments prescrits. Les économies potentielles de coûts ont ensuite été calculées en comparant les parts de marché actuelles avec les parts potentielles futures de ce marché. Contexte Le Canada. Principaux paramètres à l’étude Les différences estimées dans les dépenses que produirait un modèle rationnel de prescription. Résultats Une équivalence a été établie sur les plans de l’efficacité, de la toxicité et de la commodité dans les classes de statines, d’inhibiteurs de la pompe à protons, d’inhibiteurs de l’enzyme de conversion de l’angiotensine et d’inhibiteurs sélectifs du recaptage de l’angiotensine. Les dépenses annuelles totales dans ces classes se situent à 856 millions $ dans les programmes publics de médicaments et à 1,97 milliard $ environ à l’échelle nationale. Grâce à des prescriptions rationnelles, on estime que les économies annuelles pourraient atteindre 222 millions $ pour les programmes publics et 521 millions $ à l’échelle nationale. Conclusion La

  6. Technique distribuee de gestion de la charge sur le reseau electrique et ring-tree: Un nouveau systeme de communication P2P

    NASA Astrophysics Data System (ADS)

    Ayoub, Simon

    Le reseau de distribution et de transport de l'electricite se modernise dans plusieurs pays dont le Canada. La nouvelle generation de ce reseau que l'on appelle smart grid, permet entre autre l'automatisation de la production, de la distribution et de la gestion de la charge chez les clients. D'un autre cote, des appareils domestiques intelligents munis d'une interface de communication pour des applications du smart grid commencent a apparaitre sur le marche. Ces appareils intelligents pourraient creer une communaute virtuelle pour optimiser leurs consommations d'une facon distribuee. La gestion distribuee de ces charges intelligentes necessite la communication entre un grand nombre d'equipements electriques. Ceci represente un defi important a relever surtout si on ne veut pas augmenter le cout de l'infrastructure et de la maintenance. Lors de cette these deux systemes distincts ont ete concus : un systeme de communication peer-to-peer, appele Ring-Tree, permettant la communication entre un nombre important de noeuds (jusqu'a de l'ordre de grandeur du million) tel que des appareils electriques communicants et une technique distribuee de gestion de la charge sur le reseau electrique. Le systeme de communication Ring-Tree inclut une nouvelle topologie reseau qui n'a jamais ete definie ou exploitee auparavant. Il inclut egalement des algorithmes pour la creation, l'exploitation et la maintenance de ce reseau. Il est suffisamment simple pour etre mis en oeuvre sur des controleurs associes aux dispositifs tels que des chauffe-eaux, chauffage a accumulation, bornes de recharges electriques, etc. Il n'utilise pas un serveur centralise (ou tres peu, seulement lorsqu'un noeud veut rejoindre le reseau). Il offre une solution distribuee qui peut etre mise en oeuvre sans deploiement d'une infrastructure autre que les controleurs sur les dispositifs vises. Finalement, un temps de reponse de quelques secondes pour atteindre 1'ensemble du reseau peut etre obtenu, ce qui est

  7. Influence des interactions du couple ciment/adjuvant dispersant sur les proprietes des betons: Importance du mode d'introduction des adjuvants

    NASA Astrophysics Data System (ADS)

    Baalbaki, Moussa

    1998-12-01

    Les travaux de recherche de cette these de doctorat ont porte sur les phenomenes d'incompatibilite (ou de compatibilite) ciment/adjuvant dispersant en mettant l'accent sur l'influence du mode d'introduction des adjuvants sur les proprietes des betons frais et durcis. Les aspects physiques et chimiques de l'interaction ciment/adjuvant a ete relies aux proprietes des betons en tenant compte du rapport E/C, de la teneur en C3A du ciment ainsi que du type d'adjuvant dispersant. Le programme experimental propose debute par une etude rheologique et mecanique sur pate et sur beton. Le comportement du superplastifiant a base de polynaphtalene (PNS) depend surtout de son interaction avec les premiers produits d'hydratation du ciment. Cette interaction du superplastifiant PNS avec le ciment est remarquablement differente dans le cas ou l'ajout du PNS est differe de quelques minutes. Lorsque le superplastifiant PNS est introduit directement avec l'eau de gachage, on remarque la formation d'un gel blanc compose d'ettringite, de CaCO 3 et de polynaphtalene et ce compose organo-mineral est presque inexistant lorsque le superplastifiant PNS est ajoute en mode differe. Ce gel organo-mineral se forme a partir de la solution entre les aluminates de calcium hydrates, les sulfates et le PNS, et est responsable de la perte d'affaissement du beton. Les analyses au microscope electronique a balayage montrent que l'introduction du superplastifiant PNS en mode S1 (ajout direct) engendre la precipitation d'une plus grande quantite d'ettringite et de produit organo-mineral. Cette ettringite finement cristallisee, abondante et enchevetree aura pour consequence de diminuer les proprietes rheologiques des betons et des pates. Ce phenomene ne s'observe pas lorsque le superplastifiant PNS est introduit en mode differe. Le mode d'introduction du superplastifiant a base de polyacrylate (PAE) n'affecte nullement le comportement rheologique du beton. Par ailleurs, le gel organo-mineral n'apparait pas

  8. Mesures experimentales de l'impact des revetements hydrophobeset superhydrophobes sur la trainee et la portance d'un profil aerodynamique propre et glace

    NASA Astrophysics Data System (ADS)

    Villeneuve, Eric

    Ce projet, realise a la demande du Laboratoire International des Materiaux Antigivre, a pour but de mesurer et definir experimentalement l'impact de revetements hydrophobes sur les coefficients de trainee et de portance d'un profil NACA 0012. Pour ce faire, la balance aerodynamique du LIMA devait tout d'abord etre amelioree afin d'offrir une sensibilite suffisante pour realiser le projet. Plusieurs ameliorations ont ete faites, comme le changement des cellules de charge, la diminution du nombre de cellules de charge, le changement du cadre de la balance, etc. Une fois ces ameliorations terminees, la reproductibilite, l'exactitude et la sensibilite ont ete valides afin de s'assurer de la fiabilite des resultats offerts par la balance. Pour les angles d'attaque etudies avec les revetements, soient -6° et 0°, la balance a une reproductibilite de +/-2,06% a 360 000 de nombre de Reynolds. Pour valider la sensibilite, des essais a -6° et 0° d'angle d'attaque et des nombres de Reynolds de 360 000 et 500 000 ont ete faits avec des papiers sables. Les resultats de ces essais ont permis de, tracer des courbes de tendances du coefficient de trainee du NACA 0012 en fonction de la rugosite de surface et d'etablir la valeur de la sensibilite de la balance a +/-8 mu m. Cinq revetements populaires ont ete choisis pour l'experimentation, soient le Wearlon, le Staclean, le Hirec, le Phasebreak ainsi que le Nusil. Les revetements sont soumis aux memes conditions experimentales que les papiers sables, et une rugosite equivalente est trouvee par extrapolation des resultats. Cependant, les rugosites equivalentes de surfaces different entre -6° et 0°. Les essais avec le Staclean et le Hirec donnent des coefficients de trainee equivalent a ceux avec l'aluminium, alors que le Wearlon, le Nusil et le Phasebreak donnent une augmentation du coefficient de trainee de 13%, 17% et 25% respectivement par rapport a l'aluminium. Pour les coefficients de portance, la balance ne detecte pas l

  9. Evaluating the Impact of Guest Speaker Postings in Online Discussions

    ERIC Educational Resources Information Center

    Hemphill, Leaunda S.; Hemphill, Hoyet H.

    2007-01-01

    This study investigated the impact of virtual guest speakers facilitating asynchronous discussions. The setting was an online instructional technology course with 16 graduate students and two guest speakers. The research reports the quantity and level of critical thinking of the students and guests. Each posting was coded for frequency and…

  10. "Sturdy Black Bridges": Discussing Race, Class, and Gender

    ERIC Educational Resources Information Center

    Hinton, KaaVonia

    2004-01-01

    Black feminist literary theory offers tools that teachers can use to initiate discussions on the issues of race, gender and class to analyze the works of adolescent literature. This feminist theory helps in reading and teaching literature about parallel cultures, like African-Americans and their love for self and community and their recognition of…

  11. Library Networking: Current Problems and Future Prospects! Panel Discussion.

    ERIC Educational Resources Information Center

    Resource Sharing and Information Networks, 1983

    1983-01-01

    Presents questions and answers from information networking panel discussion involving symposium speakers Barbara Markuson (Indiana Cooperative Library Services Authority), Frank Grisham (Southeastern Library Network), Laima Mockus (New England Library Information Network), Richard McCoy (Research Libraries Group), Rowland Brown (OCLC), and Toni…

  12. "So What's New?" The Discussions in Medical Research Articles.

    ERIC Educational Resources Information Center

    Azirah, Hasim

    2000-01-01

    Examines the discussion of results in medical research articles to determine the strategies used by the writers to persuade the readers that their research is either new or a development of previous work and that their study is a contribution to a specialist field. Twenty-four research articles were analyzed using Swales moves analysis as well as…

  13. Inter-Rater Reliability of an Electronic Discussion Coding System.

    ERIC Educational Resources Information Center

    MacKinnon, Gregory R.

    A "cognote" system was developed for coding electronic discussion groups and promoting critical thinking. Previous literature has provided an account of the strategy as applied to several academic settings. This paper addresses the research around establishing the inter-rater reliability of the cognote system. The findings suggest three indicators…

  14. Supporting Controversial CSCL Discussions with Augmented Group Awareness Tools

    ERIC Educational Resources Information Center

    Buder, Jurgen; Bodemer, Daniel

    2008-01-01

    This paper describes the development of augmented group awareness tools that take mutual user ratings of their online discussion contributions as input, aggregate these data, and visually feed these data back to the members in real time, thereby informing participants about how the group as a whole perceives their contributions. A specific group…

  15. Factors Associated with Physician Discussion of Health Behaviors with Adolescents

    ERIC Educational Resources Information Center

    Choi, Won S.; Ellerbeck, Edward F.; Kaur, Harsohena; Nazir, Niaman; Ahluwalia, Jasjit S.

    2006-01-01

    Behaviors developed in adolescence influence health later in life. The purpose of this study was to investigate the frequency of health care provider's discussion of health behaviors with overweight and non-overweight adolescents and identify demographic and health behaviors related to exercise, hours of television viewing, and weight issues…

  16. 40 CFR 305.7 - Ex parte discussion of proceeding.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ..., AND LIABILITY ACT (CERCLA) ADMINISTRATIVE HEARING PROCEDURES FOR CLAIMS AGAINST THE SUPERFUND General... 40 Protection of Environment 28 2014-07-01 2014-07-01 false Ex parte discussion of proceeding. 305.7 Section 305.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)...

  17. 40 CFR 305.7 - Ex parte discussion of proceeding.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ..., AND LIABILITY ACT (CERCLA) ADMINISTRATIVE HEARING PROCEDURES FOR CLAIMS AGAINST THE SUPERFUND General... 40 Protection of Environment 27 2010-07-01 2010-07-01 false Ex parte discussion of proceeding. 305.7 Section 305.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)...

  18. 40 CFR 305.7 - Ex parte discussion of proceeding.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ..., AND LIABILITY ACT (CERCLA) ADMINISTRATIVE HEARING PROCEDURES FOR CLAIMS AGAINST THE SUPERFUND General... 40 Protection of Environment 28 2011-07-01 2011-07-01 false Ex parte discussion of proceeding. 305.7 Section 305.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)...

  19. 40 CFR 305.7 - Ex parte discussion of proceeding.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ..., AND LIABILITY ACT (CERCLA) ADMINISTRATIVE HEARING PROCEDURES FOR CLAIMS AGAINST THE SUPERFUND General... 40 Protection of Environment 29 2013-07-01 2013-07-01 false Ex parte discussion of proceeding. 305.7 Section 305.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)...

  20. 40 CFR 305.7 - Ex parte discussion of proceeding.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ..., AND LIABILITY ACT (CERCLA) ADMINISTRATIVE HEARING PROCEDURES FOR CLAIMS AGAINST THE SUPERFUND General... 40 Protection of Environment 29 2012-07-01 2012-07-01 false Ex parte discussion of proceeding. 305.7 Section 305.7 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)...