Sample records for zr-rich accessory minerals

  1. Hunting for eruption ages in accessory minerals

    NASA Astrophysics Data System (ADS)

    Vazquez, J. A.

    2012-12-01

    A primary goal in geochronology is to provide precise and accurate ages for tephras that serve as chronostratigraphic markers for constraining the timing and rates of volcanism, sedimentation, climate change, and catastrophic events in Earth history. Zircon remains the most versatile accessory mineral for dating silicic tephras due to its common preservation in distal pyroclastic deposits, as well as the robustness of its U-Pb and U-series systems even after host materials have been hydrothermally altered or weathered. Countless studies document that zircon may be complexly zoned in age due to inheritance, contamination, recycling of antecrysts, protracted crystallization in long-lived magma reservoirs, or any combination of these. Other accessory minerals such as allanite or chevkinite can retain similar records of protracted crystallization. If the goal is to date the durations of magmatic crystallization, differentiation, and/or magma residence, then these protracted chronologies within and between accessory minerals are a blessing. However, if the goal is to date the timing of eruption with high precision, i.e., absolute ages with millennial-scale uncertainties, then this age zoning is a curse. Observations from ion microprobe 238U-230Th dating of Pleistocene zircon and allanite provide insight into the record of near-eruption crystallization in accessory minerals and serve as a guide for high-precision whole-crystal dating. Although imprecise relative to conventional techniques, ion probe analysis allows high-spatial resolution 238U-230Th dating that can document multi-millennial age distributions at the crystal scale. Analysis of unpolished rims and continuous depth profiling of zircon from small and large volume eruptions (e.g., Coso, Mono Craters, Yellowstone) reveals that the final several micrometers of crystallization often yield ages that are indistinguishable from associated eruption ages from the 40Ar/39Ar or (U-Th)/He methods. Using this approach, we have derived relatively precise (± ~ 5%, 2?) U-Th isochron ages from the unpolished rims of pumice-derived allanite and zircon from late Pleistocene Wilson Creek Formation tephras in eastern California, whose ages are controversial and have been difficult to resolve via 40Ar/39Ar and radiocarbon dating. Allanite and zircon rims from Ashes 7-19 in the lower portion of Wilson Creek sediments yield stratigraphically consistent ages of ca. 27 ka to ca. 62 ka, with a minority of crystals identifiable as xenocrysts from early Mono Craters rhyolites. Model ages for the interiors of allanite crystals are mostly < 10 k.y. older than their rims. Tephra deposited during the geomagnetic excursion debated to be either the Mono Lake or Laschamp event yields a rim isochron age of ca. 41 ka. This age is indistinguishable from an independent age of 41 ka derived at the latter excursion's type locality in France (Singer et al., 2009) as well as from age-models for deep-sea sediments. The results are in excellent agreement with a previously determined chronology derived from magnetostratigraphy (Zimmerman et al., 2006). Refs: Singer et al., 2009, EPSL 286: 80-88; Zimmerman et al., 2006, EPSL 252: 94-106

  2. Identification and significance of accessory minerals from a bituminous coal

    USGS Publications Warehouse

    Finkelman, R.B.; Stanton, R.W.

    1978-01-01

    A scanning electron microscope (SEM) has been used to study the in situ accessory minerals in polished blocks and pellets of petrographically analysed samples of the Waynesburg coal (hvb). Individual grains from the low-temperature ash (LTA) of the same coal were also studied. The visual resolution of the SEM permitted the detection of submicron mineral grains, which could then be analysed by the attached energy-dispersive system. Emphasis was placed on the highly reflective grains in the carbominerite bands. Among the most abundant accessory minerals observed were rutile, zircon, and rare-earth-bearing minerals. Small (1-5 ??m) particles of what may be authigenic iron-rich chromite and a nickel silicate form rims on quartz grains. The SEM also permits the observation of grain morphology and mineral intergrowths. These data are useful in determining authigenicity and diagenic alteration. Substances in density splits of LTA include authigenic, detrital, extraterrestrial magnetite, tourmaline, and evaporite (?) minerals, and a fluorine-bearing amphibole. This analytical approach allows the determination of specific sites for many of the trace elements in coals. In the Waynesburg coal, most of the chromium is in the iron-chromium rims, the fluorine is in the amphibole, and the rare-earth elements are in rare-earth-bearing minerals. The ability to relate trace-element data to specific minerals will aid in predicting the behaviour of elements in coal during combustion, liquefaction, gasification, weathering, and leaching processes. This ability also permits insight into the degree of mobility of these elements in coal and provides clues to sedimentological and diagenetic conditions. ?? 1978.

  3. Inclusion\\/host relations involving accessory minerals in high-grade metamorphic and anatectic rocks

    Microsoft Academic Search

    E. Bruce Watson; Edward P. Vicenzi; Robert P. Rapp

    1989-01-01

    In general, accessory minerals are expected to participate in partial fusion of their host rocks to a degree determined simply\\u000a by their solubilities in the melt. The possibility must be recognized, however, that a given accessory grain may be physically\\u000a isolated from the melt by inclusion within a residual major mineral. Because of the importance of accessory minerals to crustal-rock

  4. Partition coefficients for rare earth elements in mafic minerals of high silica rhyolites: the importance of accessory mineral inclusions

    Microsoft Academic Search

    P MICHAEL

    1988-01-01

    REE concentrations of mafic mineral separates from high-silica rhyolites measured by INAA are high and variable compared to electron microprobe analyses of the minerals themselves. The mafic phases commonly contain inclusions or have adhering grains of accessory rare earth element (REE)-rich minerals. Optical and electron microscopic observation revealed discrete grains of chevkinite (rare earth titano-silicate) included within clinopyroxenes from the

  5. Accessory and opaque minerals in impact melt rocks of the Boltysh structure, Ukraine

    NASA Astrophysics Data System (ADS)

    Gurov, E. P.; Shekhunova, S. B.; Permyakov, V. V.

    2015-05-01

    Electron microprobe analyses of accessory and opaque minerals from the impact melt rocks of the Boltysh structure, in the central part of the Ukrainian Shield, are presented in this report. Our study establishes a variety of minerals represented by native metals, alloys, oxides, sulfides, phosphates, and silicates, formed during several stages of cooling and solidification of the thick impact melt sheet. Baddeleyite was determined to be the earliest high-temperature mineral to occur in the impact melt rocks. Iron and titanium oxides crystallized earlier or simultaneously with the microliths of orthopyroxene and feldspars. High concentrations of TiO2, Al2O3, and Cr2O3 were identified in some hematite varieties. Cu- and Ni-bearing pyrrhotites occur in impact melt rocks with a glassy matrix. Native metals—copper, platinum, and silver—were likely formed due to the hydrothermal alteration of the upper unit of the impact melt sheet. Zircon is the only accessory mineral found in impact melt rocks that is preserved from the basement granites of the Boltysh structure.

  6. Accessory and opaque minerals in impact melt rocks of the Boltysh structure, Ukraine

    NASA Astrophysics Data System (ADS)

    Gurov, E. P.; Shekhunova, S. B.; Permyakov, V. V.

    2015-06-01

    Electron microprobe analyses of accessory and opaque minerals from the impact melt rocks of the Boltysh structure, in the central part of the Ukrainian Shield, are presented in this report. Our study establishes a variety of minerals represented by native metals, alloys, oxides, sulfides, phosphates, and silicates, formed during several stages of cooling and solidification of the thick impact melt sheet. Baddeleyite was determined to be the earliest high-temperature mineral to occur in the impact melt rocks. Iron and titanium oxides crystallized earlier or simultaneously with the microliths of orthopyroxene and feldspars. High concentrations of TiO2, Al2O3, and Cr2O3 were identified in some hematite varieties. Cu- and Ni-bearing pyrrhotites occur in impact melt rocks with a glassy matrix. Native metals—copper, platinum, and silver—were likely formed due to the hydrothermal alteration of the upper unit of the impact melt sheet. Zircon is the only accessory mineral found in impact melt rocks that is preserved from the basement granites of the Boltysh structure.

  7. In-situ Nd isotope measurements on accessory minerals: Insights into isotope equilibration during metamorphism

    NASA Astrophysics Data System (ADS)

    Hammerli, Johannes; Spandler, Carl; Kemp, Tony; Pirard, Cassian

    2015-04-01

    Understanding isotope equilibration processes during metamorphism has huge implications for a range of geoscience applications, ranging from provenance studies of sedimentary units to the origin of magmas and ore bodies. Furthermore, recent claims of isotope disequilibrium situations during the melting of continental crust have questioned the reliability of using certain isotope systems to track magma sources. Our recent work investigated a prograde sequence of high-temperature, low-pressure (350-650 ?C, ~3-5 kbar) metasedimentary rocks from the Mt. Lofty Ranges, South Australia that underwent widespread pervasive fluid flow at peak metamorphism. In situ Nd-isotope analyses by LA-MC-ICP-MS found that the detrital signature of apatite survives temperatures of 500 °C. However, the observed isotope equilibration of REE-bearing accessory minerals at ~600 °C, before the onset of partial melting, suggests that isotope disequilibrium is unlikely during high-grade metamorphism of upper crustal rocks where fluid induced melting takes place. Here, we extend our research to metasedimentary rocks from (ultra)-high pressure metamorphic terrains from northern New Caledonia, and Dabieshan, China that represent pressure and temperature conditions found in subduction zones. Our study helps to understand isotope equilibration processes from heterogeneous protoliths as well as the impact of retrogression and the resetting of isotope systems over a pressure-temperature range from ~350 °C to 700 °C and ~15 kbar to 40 kbar. Nd isotope analyses of apatite, allanite, titanite, xenotime, monazite, lawsonite and epidote in pelitic and psammitic samples allow the investigation of isotope equilibration on a mineral and sub-mineral scale, as well as comparison with traditional bulk rock isotope analyses. Our preliminary results show that under high-pressure conditions (~20 to 30 kbar) and temperatures to ~650 °C, REE-bearing phases show variable ?Nd values in some cases. These differences cannot be simply explained with retrogressive processes and the partial resetting of the isotope system. The results rather suggest that isotopic exchange between different REE-phases in such systems might be limited, and hence heterogeneous isotope signatures of protolithic sedimentary rocks can survive to great depths in subduction-zone environments. These results may have bearing on the reliability of isotopic tracking of the subducted slab component of arc magmas.

  8. Is the clogging process in Maqarin natural analogue controlled by accessory clay minerals? A reactive transport study with new data.

    NASA Astrophysics Data System (ADS)

    Shao, H.; Kosakowski, G.; Berner, U.; Kulik, D.; Mäder, U.; Kolditz, O.

    2012-04-01

    The safety of nuclear waste repositories is based on the functionality of multiple natural and engineered barriers for very long time. The barrier system typically combines geochemically different materials that might interact with each other. One example is the long term alteration of sedimentary host rocks by the interaction with high pH pore water from cement materials used for tunnel support, seals and as backfill material. Within this context the Maqarin site in Jordan was investigated since more than 20 years as a natural analogue for rock alterations and pore clogging due to ingress of high pH solutions. In this work we examine the geochemical evolution of Maqarin marl rock in contact with a fracture through which a hyper-alkaline groundwater is circulating. The new reactive transport calculations were performed with the code OpenGeoSys-GEMS and utilize a state-of-the-art geochemical model for cement-clay interactions. The simulations reveal that the precipitation of ettringite, and to a smaller extent the precipitation of calcium-silicate-hydrate (CSH), is responsible for pore clogging in the rock matrix. Clogging of the pore space effectively seals the rock matrix on a centimeter scale after some hundreds of years and suppresses mass transfer of solutes from the fracture into the adjacent rock. In our Maqarin marl rock model typical clay minerals like kaolinite and illite are present in accessory mineral quantities only. A sensitivity analysis reveals that in this setup clay minerals are the main source for Al, necessary for the formation of ettringite-type solid solutions. It is thus the clay mineral content and the dissolution reactions that to a large degree control the spatial and temporal precipitation of ettringites and the associated pore clogging. Recently collected mineralogy and porosity data will be used to re-calibrate the model and to verify our improved findings that overall Maqarin system is controlled by accessory clay minerals.

  9. The Fast and the Slow, the High and the Low - Investigations of Pb and He Diffusion in Accessory Minerals and Implications for Geochronology (Invited)

    Microsoft Academic Search

    D. J. Cherniak; E. B. Watson

    2009-01-01

    We have measured Pb diffusion in a range of accessory minerals over the past few decades, and have recently begun investigations of helium diffusion with a study of diffusion in apatite and zircon (Cherniak et al., 2009). In this work, we obtained the following Arrhenius relation for He diffusion in Durango fluorapatite: D = 2.10x10-6 exp( - 117 ± 6

  10. Mineral Dissolution and Precipitation due to Carbon Dioxide-Water-Rock Interactions: The Significance of Accessory Minerals in Carbonate Reservoirs (Invited)

    NASA Astrophysics Data System (ADS)

    Kaszuba, J. P.; Marcon, V.; Chopping, C.

    2013-12-01

    Accessory minerals in carbonate reservoirs, and in the caprocks that seal these reservoirs, can provide insight into multiphase fluid (CO2 + H2O)-rock interactions and the behavior of CO2 that resides in these water-rock systems. Our program integrates field data, hydrothermal experiments, and geochemical modeling to evaluate CO2-water-rock reactions and processes in a variety of carbonate reservoirs in the Rocky Mountain region of the US. These studies provide insights into a wide range of geologic environments, including natural CO2 reservoirs, geologic carbon sequestration, engineered geothermal systems, enhanced oil and gas recovery, and unconventional hydrocarbon resources. One suite of experiments evaluates the Madison Limestone on the Moxa Arch, Southwest Wyoming, a sulfur-rich natural CO2 reservoir. Mineral textures and geochemical features developed in the experiments suggest that carbonate minerals which constitute the natural reservoir will initially dissolve in response to emplacement of CO2. Euhedral, bladed anhydrite concomitantly precipitates in response to injected CO2. Analogous anhydrite is observed in drill core, suggesting that secondary anhydrite in the natural reservoir may be related to emplacement of CO2 into the Madison Limestone. Carbonate minerals ultimately re-precipitate, and anhydrite dissolves, as the rock buffers the acidity and reasserts geochemical control. Another suite of experiments emulates injection of CO2 for enhanced oil recovery in the Desert Creek Limestone (Paradox Formation), Paradox Basin, Southeast Utah. Euhedral iron oxyhydroxides (hematite) precipitate at pH 4.5 to 5 and low Eh (approximately -0.1 V) as a consequence of water-rock reaction. Injection of CO2 decreases pH to approximately 3.5 and increases Eh by approximately 0.1 V, yielding secondary mineralization of euhedral pyrite instead of iron oxyhydroxides. Carbonate minerals also dissolve and ultimately re-precipitate, as determined by experiments in the Madison Limestone, but pyrite will persist and iron oxyhydroxides will not recrystallize.

  11. The evolution of the Peach Spring Tuff magmatic system as revealed by accessory mineral textures and compositions

    NASA Astrophysics Data System (ADS)

    Pamukcu, A. S.; Gualda, G. A.; Miller, C. F.; Wooden, J. L.

    2010-12-01

    The Peach Spring Tuff (PST), a large Miocene ignimbrite located in the southwestern USA, is distinctive in its abundance of U, Th, and REE concentrating accessory minerals (zircon, sphene, allanite, chevkinite). We have examined textures and compositions of these accessory minerals and magnetite, as well as glasses, in pumice clasts and fiamme from the PST outflow and intracaldera by a variety of methods. Textures of crystal populations were assessed qualitatively in thin sections and crystal separates, and quantitatively by differential absorption x-ray tomography (DAT) to obtain quantitative textural information (i.e. crystal size distributions, CSDs). We have also analyzed REE compositions of glasses by LA-ICPMS and zircon and sphene by SHRIMP-RG. Pumice clasts and fiamme from the outflow sheet and intracaldera deposits range in composition and crystal content, from relatively crystal-poor rhyolites to crystal-rich trachytes, with intracaldera fiamme on the less silicic end of this spectrum. REE trends in zircon and sphene grains reveal a simple fractionation history in rhyolites, but MREE enrichment in sphene edges in trachytes suggest final growth from a less evolved melt. Ti-in-zircon and Zr-in-sphene thermometry reveals lower temperature growth at edges of grains from rhyolites (down to ~730 °C), while edges from trachytes record warmer temperatures (up to ~980 °C). Trace element variations and estimated temperatures also suggest that zircon has a more protracted history of growth than other accessory phases. Textures are consistent with the geochemical results. Phenocrysts in rhyolites tend to be euhedral, while those from intracaldera trachytes display resorption features. Zircon and allanite+chevkinite size distributions in outflow pumice clasts and intracaldera fiamme generally display exponential CSDs, consistent with a simple growth and nucleation history. Sphene and magnetite size distributions in outflow samples are generally kinked, with large numbers of small (<100 µm) crystals, suggestive of enhanced nucleation due to rapid decompression. In intracaldera fiamme, the abundance of large sphene crystals (>200 µm) is considerably lower than what is found for the other accessory phases, and sphene CSDs have concave-down shapes for crystals <100 µm. These features are consistent with resorption. The lack of a concave-down section in zircon and allanite+chevkinite CSDs is likely due to comparatively slower growth rates of these phases. These results suggest that the PST was a zoned system affected by a late-stage heating event, which may have triggered eruption, followed by eruptive decompression. Timescales of crystallization calculated from magnetite size distributions suggest this decompression event occurred at most months to a year before eruption. One outflow pumice clast of trachyte composition follows compositional trends of intracaldera trachytes and textural trends of outflow rhyolites, suggesting that these events affected different regions of the chamber to different extents.

  12. Yo-yo subduction recorded by accessory minerals in the Italian Western Alps

    NASA Astrophysics Data System (ADS)

    Rubatto, Daniela; Regis, Daniele; Hermann, Jörg; Boston, Katherine; Engi, Martin; Beltrando, Marco; McAlpine, Sarlae R. B.

    2011-05-01

    High-pressure metamorphic rocks form during subduction of Earth's crust to mantle depths at convergent plate margins. Their exposure at the surface of Earth today provides a record of the subduction zone process. In general, such metamorphic rocks record only a single cycle of subduction and exhumation, yet tectonic models suggest that individual rock units should undergo multiple subduction-exhumation cycles. Here we investigate the microstructure and chemical composition of metamorphic minerals in high-pressure rocks exposed in the Sesia zone in the Italian Western Alps. We find that the minerals white mica, garnet, allanite and zircon each exhibit multiple generations of mineral overgrowths. In particular, two generations of white mica with high-silicon content, indicative of formation at high pressure, are separated by an overgrowth with low-silicon content that formed during exhumation at low pressures. Furthermore, the trace-element signatures of distinct zones within zircon and allanite also reveal two episodes of high-pressure metamorphism, separated by a period of rapid exhumation. We use uranium-lead dating of zircon and allanite overgrowths to constrain the timing of this subduction-exhumation-subduction cycle to 79-65Myr ago. We conclude that slices of the Sesia zone crust experienced two cycles of burial to mantle depths in less than 20million years. The yo-yo subduction occurred during oblique convergence between the African and European plates, which involved a continental margin.

  13. Accessory and rock forming minerals monitoring the evolution of zoned mafic ultramafic complexes in the Central Ural Mountains

    NASA Astrophysics Data System (ADS)

    Krause, J.; Brügmann, G. E.; Pushkarev, E. V.

    2007-04-01

    This study describes major and trace element compositions of accessory and rock forming minerals from three Uralian-Alaskan-type complexes in the Ural Mountains (Kytlym, Svetley Bor, Nizhnii Tagil) for the purpose of constraining the origin, evolution and composition of their parental melts. The mafic-ultramafic complexes in the Urals are aligned along a narrow, 900 km long belt. They consist of a central dunite body grading outward into clinopyroxenite and gabbro lithologies. Several of these dunite bodies have chromitites with platinum group element mineralization. High Fo contents in olivine (Fo 92-93) and high Cr/(Cr + Al) in spinel (0.67-0.84) suggest a MgO-rich (> 15 wt.%) and Al 2O 3-poor ultramafic parental magma. During its early stages the magma crystallized dominantly olivine, spinel and clinopyroxene forming cumulates of dunite, wehrlite and clinopyroxenite. This stage is monitored by a common decrease in the MgO content in olivine (Fo 93-86) and the Cr/(Cr + Al) value of coexisting accessory chromite (0.81-0.70). Subsequently, at subsolidus conditions, the chromite equilibrated with the surrounding silicates producing Fe-rich spinel while Al-rich spinel exsolved chromian picotite and chromian titanomagnetite. This generated the wide compositional ranges typical for spinel from Uralian-Alaskan-type complexes world wide. Laser ablation analyses (LA-ICPMS) reveal that clinopyroxene from dunites and clinopyroxenite from all three complexes have similar REE patterns with an enrichment of LREE (0.5-5.2 prim. mantle) and other highly incompatible elements (U, Th, Ba, Rb) relative to the HREE (0.25-2.0 prim. mantle). This large concentration range implies the extensive crystallization of olivine and clinopyroxene together with spinel from a continuously replenished, tapped and crystallizing magma chamber. Final crystallization of the melt in the pore spaces of the cooling cumulate pile explains the large variation in REE concentrations on the scale of a thin section, the REE-rich rims on zoned clinopyroxene phenocrysts (e.g. La Rim/La Core ˜ 2), and the formation of interstitial clinopyroxene with similar REE enrichment. Trace element patterns of the parental melt inferred from clinopyroxene analyses show negative anomalies for Ti, Zr, Hf, and a positive anomaly for Sr. These imply a subduction related geotectonic setting for the Uralian zoned mafic-ultramafic complexes. Ankaramites share many petrological and geochemical features with these complexes and could represent the parental melts of this class of mafic-ultramafic intrusions. Diopside from chromitites and cross cutting diopside veins in dunite has similar trace element patterns with LREE/HREE ratios (e.g. La/Lu = 5-60) much higher than those in diopside from all other lithologies. We suggest that the chromitites formed at high temperatures (800-900 °C) during the waning stages of solidification as a result of the interaction of an incompatible element-rich melt or fluid with the dunite cumulates.

  14. Reviving Moribund Intrusive Complexes: Mafic Thermal Input, the Accessory Mineral Record, and the Pluton-Volcano Connection

    NASA Astrophysics Data System (ADS)

    Miller, C. F.; Gualda, G. A.; Padilla, A. J.; Pamukcu, A. S.; Claiborne, L. L.; Carley, T. L.; Flanagan, D. M.

    2011-12-01

    Intrusive and extrusive silicic systems spanning subduction zone, oceanic, and intracontinental settings and ranging from small, persistent eruptive centers to supereruptions show evidence for periodic thermal input. We present examples demonstrating that this input is responsible for remobilizing stagnant intrusions and apparently triggering eruptions. Mafic recharge is the evident heat source in some and implicated indirectly in others. Field relations, textures, accessory mineral zoning, and U-Pb and U-Th geochronology provide evidence for the inferred thermal reinvigoration of these systems: --Mount St. Helens, WA (active subduction zone volcano): Combined U-Th dating and elemental analysis demonstrates that zircon grew from residual silicic melt in relatively cool storage zones,10's to 100's of ky prior to eruption, and that its growth was episodic over the history of the system. Zircon crystals are thus samples of stagnant intrusive ("plutonic") parts of the St. Helens system, entrained in hotter ascending magmas during replenishment and local rejuvenation. --Highland Range volcanics & Searchlight pluton, NV (Miocene volcanic-plutonic system, incipient crustal extension): Evidence for late-stage mingling between intermediate and highly evolved, crystal-rich magma is preserved in the pluton, large dikes, a near-surface plug, and the final erupted products of the system, which were accompanied and followed by andesite lavas. Resorption and reaction rimming of sphene and large feldspar and quartz crystals in the dikes, plug, and volcanic rocks attest to heating. We infer that voluminous andesite invaded nearly-solid leucogranite, remobilized it, and triggered final eruptions. --Peach Spring Tuff, AZ, CA, NV (Miocene supereruption, incipient crustal extension): In contrast to phenocryst-poor rhyolitic outflow, intracaldera tuff is crystal-rich trachyte. Feldspar and sphene phenocrysts are extensively resorbed and rims of zircon crystals record a >100 degree C spike in T. We conclude that the trachyte tuff is cumulate from the base of the pre-eruption chamber that was remobilized by an intense heating event. Based on Rhyolite-MELTS modelling, we estimate that this cumulate was initially uneruptible "rigid sponge" with 10-20% melt. Sparse andesitic enclaves may reflect the source of thermal rejuvenation of the mush. --Austurhorn intrusive complex (Late Miocene) & historic silicic eruptions, Iceland (hyperactive mid-ocean rift adjacent to hot spot): Austurhorn records extensive mingling between basaltic and silicic magma. Zircon U-Pb data reveal a major episode of mafic intrusion at 6.0 Ma. This intrusion partially remobilized felsic material and induced a second episode of zircon growth in the dominantly 6.5 Ma complex. Historic silicic eruptions are also usually accompanied by mafic lavas and/or enclaves, and zircon records T significantly lower than erupting magma and ages of 10's of ka. Our experience suggests that thermal rejuvenation plays a vital role in the dynamic behavior of many and perhaps most silicic systems. It is further consistent with the hypothesis that such systems are long-lived but that their normal state is as melt-poor, immobile, uneruptible bodies that only sporadically spring to life.

  15. Enhancing in-situ U-series accessory mineral chronometry to constrain pace and processes of magma accumulation, storage, and eruption

    NASA Astrophysics Data System (ADS)

    Schmitt, A. K.

    2008-12-01

    Over the past decade, deciphering absolute crystallization ages at micro-scales through in-situ U-series dating has spearheaded conceptual changes in the understanding of how magmas evolve en route to the surface. U-Th and U-Pb zircon geochronology by secondary ionization mass spectrometry (SIMS) now routinely accesses a continuous age spectrum extending well into the Holocene with ka precision for individual analysis spots ~25 - 40 ?m in diameter. SIMS depth profiling further increases spatial resolution at least tenfold. These developments are epitomized by studies that document multiple generations of zircon growth, predating eruptions by 10's to 100's of ka, as common features in silicic volcanics. Recently, these methods have been enhanced by (1) linking ages to Ti-in-zircon thermometry and trace element or oxygen isotopic fingerprinting; (2) tracking compositional changes with age in accessory minerals sensitive to magma differentiation, such as allanite; and (3) combining U-Th zircon ages with other chronometers, such as (U-Th)/He zircon or 226Ra-230Th-238U plagioclase dating. The emerging picture reveals a wide gamut of processes acting in magma bodies, including piecemeal, compartmentalized magma aggregation, protracted and thermally retrograde crystal storage coupled with magma differentiation, thermal rejuvenation and recycling of crystal mushes and solidified intrusions or magma chamber rinds, and wall rock assimilation. For the future, experimental constraints on accessory mineral-melt partitioning (e.g., Ayers and Luo, 2008: Geochim Cosmochim Acta, v. 72, p. A39) promise to put interpretation of zircon compositions on firmer footing, as is the case for additional accessory mineral saturation calibrations and improved modeling of existing ones (e.g., Harrison et al., 2007: Geology, v. 35, p. 635-638). By the same token, new experimental constraints on U-series element partitioning (e.g., Miller et al., 2007: Am Min, v. 92, p. 1535-1538) should enhance precision and applicability of mineral chronometers. Moreover, analytical advances in high spatial resolution SIMS hold promise for utilizing melt inclusions in zircon as an additional repository for constraining the chemical and thermal evolution of magmas.

  16. Gahnite, chrysoberyl and beryl co-occurrence as accessory minerals in a highly evolved peraluminous pluton: The Belvís de Monroy leucogranite (Cáceres, Spain)

    NASA Astrophysics Data System (ADS)

    Merino, E.; Villaseca, C.; Orejana, D.; Jeffries, T.

    2013-10-01

    Gahnite (ZnAl2O4), chrysoberyl (BeAl2O4) and beryl (Be3Al2Si6O18) have been found as accessory minerals in the external, highly fractionated, leucogranitic unit within the Hercynian reversely zoned Belvís de Monroy pluton (westernmost part of the Montes de Toledo batholith, Cáceres, Spain). The highly felsic (SiO2 > 72 wt.%) and peraluminous (ACNK > 1.2) character of this leucogranite, together with the high content of some incompatible elements (F, Li, B, and P), seems to be a primary consequence of fractional crystallization in a magmatic closed-system. The high Be contents and Zn/FeTotal ratio (> 0.01) are relevant factors which have favoured the precipitation of these minerals. Moreover, the Si, Al, P, B, and F activities might be high, favouring the magmatic crystallization of such exotic mineral phases together with Be-rich cordierite, F-rich micas, sillimanite and Al-rich phosphates. In fact, the interplay between the silica and alumina activities likely controls the stabilization and the preferential crystallization of gahnite + chrysoberyl or beryl + chrysoberyl assemblages in mm-sized microdomains. The P-T crystallization conditions are constrained by the muscovite and sillimanite stability fields and the minimum granite Al2O3-saturated solidus, and have been estimated at temperatures between 670 and 700 °C, and pressures between 1 and 2 kbar.

  17. Heterogeneous nucleation of ?-type precipitates on nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy

    PubMed Central

    2012-01-01

    Zirconium (Zr) is an important alloying element to Mg-Zn-based alloy system. In this paper, we report the formation of the ?-type precipitates on the nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy during ageing at 180°C. Scanning transmission electron microscopy examinations revealed that the nanoscale Zr-rich [0001]? rods/laths are dominant in the Zr-rich core regions of the as-quenched sample after a solution treatment at 430°C. More significantly, these Zr-rich particles served as favourable sites for heterogeneous nucleation of the Zn-rich ?-type phase during subsequent isothermal ageing at 180°C. This research provides a potential route to engineer precipitate microstructure for better strengthening effect in the Zr-containing Mg alloys. PMID:22682092

  18. Redistribution of rare earth elements, thorium, and uranium over accessory minerals in the course of amphibolite to granulite facies metamorphism: The role of apatite and monazite in orthogneisses from southwestern Norway

    Microsoft Academic Search

    Bernard Bingen; Daniel Demaiffe; Jan Hertogen

    1996-01-01

    The amphibolite to granulite facies transition has been studied in a high-K calc-alkaline, hornblende-biotite, K-feldspar megacrystic augen gneiss series from the Rogaland-Vest-Agder (Rog-VA) sector of the Sveconorwegian province (southwest Norway). Hornblende begins to break down mainly to clinopyroxene at the Cpx-in isograd and biotite mainly to orthopyroxene at the Opx-in isograd (abbreviations for minerals following Kretz, 1983). The magmatic accessory

  19. The Fast and the Slow, the High and the Low - Investigations of Pb and He Diffusion in Accessory Minerals and Implications for Geochronology (Invited)

    NASA Astrophysics Data System (ADS)

    Cherniak, D. J.; Watson, E. B.

    2009-12-01

    We have measured Pb diffusion in a range of accessory minerals over the past few decades, and have recently begun investigations of helium diffusion with a study of diffusion in apatite and zircon (Cherniak et al., 2009). In this work, we obtained the following Arrhenius relation for He diffusion in Durango fluorapatite: D = 2.10x10-6 exp( - 117 ± 6 kJ mol-1/RT) m2sec-1 In contrast to apatite, He diffusion in zircon exhibits marked anisotropy, with diffusion normal to c about two orders of magnitude slower than diffusion parallel to c. For He diffusion in zircon we determined these Arrhenius relations for diffusion normal and parallel to c: D?c = 2.3x10-7 exp(-146± 11 kJ mol-1/RT) 2sec-1 D?c = 1.7x10-5 exp(-148± 17 kJ mol-1/RT)m2sec-1 As a continuation of these efforts, we have characterized diffusion of helium in natural monazite and titanite. Polished slabs of these minerals were implanted with 100 keV 3He at a dose of 5x1015 3He/cm2. Implanted monazite and titanite were annealed in Pt capsules in 1-atm furnaces for times ranging from 15 minutes to 6 weeks at temperatures from 252-600°C. 3He distributions in the minerals were measured with Nuclear Reaction Analysis using the reaction 3He(d,p)4He. For diffusion normal to (100) we obtain the following Arrhenius relation for He diffusion in monazite: D = 1.6x10-7 exp(-150 ± 11 kJ mol-1/RT) m2sec-1. Over the investigated temperature range, diffusivities are similar to those measured by Boyce et al. (2005), and fall between the values measured by Farley (2007) for diffusion in synthetic CePO4, NdPO4, SmPO4, and GdPO4. He diffusion in monazite is similar to He diffusion in zircon normal to c, and about 4 orders of magnitude slower than He diffusion in apatite (Cherniak et al., 2009). For diffusion in titanite, we obtain the Arrhenius relation: D = 8.7x10-7 exp(-143 ± 7 kJ mol-1/RT) m2sec-1. He diffusivities for titanites from two different localities are comparable, and similar to those measured in the outgassing experiments of Shuster et al. (2003). He diffusion in titanite is intermediate between He diffusion parallel and normal to c in zircon, and about 3 orders of magnitude slower than He diffusion in apatite (Cherniak et al., 2009). In this presentation, we will consider these findings in light of other determinations of He diffusion and Pb diffusion in various accessory phases, and discuss the implications of these diffusivities in interpreting thermal histories. Since He diffusion is many orders of magnitude faster than Pb diffusion, geologic conditions under which these species will be retained or lost span a broad and disparate range, with applications from surface processes to those deep in the crust. Boyce, J.W., Hodges, K.V., Olszewski, W.J., Jercinovic, M.J.(2005) G3, 6, Q12004; Cherniak, D.J., Watson, E.B., Thomas, J.B. (2009) Chem. Geol. (submitted); Farley, K.A. (2007) GCA 71, 4015-4024, Shuster, D.L., Farley, K.A., Sisterson, J.M., Burnett, D.S.(2003) EPSL 217, 19-32.

  20. Fatigue properties for the fracture strength of columnar accessory minerals embedded within metamorphic tectonites: implications for stress magnitude in continental crust at the depth of the brittle-plastic transition zone

    NASA Astrophysics Data System (ADS)

    Kimura, N.; Iwashita, N.; Masuda, T.

    2009-04-01

    1. Introduction Previous studies have compiled yield-strength profiles of continental lithosphere based on the results of laboratory measurements and numerical calculations; however, yield-strength values remain poorly constrained, especially at depths below the brittle-plastic transition zone. Recent studies by the authors have refined the microboudin technique for estimating palaeostress magnitude in the deep crust (> 10 km depth). This technique has the potential to provide important information on stress levels in the deep continental crust, an environment to which available in situ stress measurements and palaeopiezometric methods cannot be applied. In applying the microboudinage technique, obtaining an estimate of the palaeostress magnitude requires knowledge of the fracture strength of columnar accessory minerals (e.g., tourmaline, amphibole, and epidote) that are subjected to brittle fracturing during plastic deformation of the surrounding matrix minerals. The absolute magnitude of fracture strength is known to show a marked reduction in the case of fatigue fracture. Fatigue fracture falls into two categories: static fatigue and cyclic fatigue. In the field of experimental rock deformation, stress corrosion by water molecules (static fatigue) is commonly invoked as the mechanism of fatigue fracture; however, evidence of both static and cyclic fatigue has been reported from studies of natural geological samples. The present study focused on the fatigue properties of columnar accessory minerals at high temperatures, with the aim of improving the accuracy of estimates of natural palaeostress magnitude at depth in the crust. 2. Constant stress-rate test A constant stress-rate test was performed to determine the influence of static fatigue on the strength of columnar accessory minerals. The test was conducted under three-point bending with a span distance of 10 mm. Temperature conditions and the crosshead speed were set in the ranges of ambient to 600°C, and 0.0005 to 0.2 mm/min, respectively. Pressure and relative humidity were set to room conditions. Tourmaline was chosen for testing (as representative of columnar accessory minerals embedded within metamorphic tectonites) because this is the only mineral for which crystals are available of sufficient size and quality. A total of 120 prism-shaped tourmaline test pieces (dimensions, 2×2×12 mm) were prepared from a single tourmaline block collected from Minas Gerais, Brazil. The flexural strength of tourmaline shows a clear decrease with decreasing crosshead speed at ambient temperature (with n ? 15 as the static fatigue parameter); however, this trend weakens with increasing temperature (n > 50); that is, the influence of static fatigue on the strength of tourmaline decreases with increasing temperature. A comparable result has been reported for glass materials because of difficulties in the absorption of moisture on sample surfaces under high-temperature conditions. The fabric pattern of fracture planes developed in tourmaline specimens in the present study, which show rectilinear scratches, arrests, or Wallner lines on smooth surfaces, is similar to that observed for glass materials. 3. Fractography of naturally deformed minerals A ‘striation-like' pattern resulting from cyclic fatigue fracture was observed by scanning electron microscope (SEM) analysis of a natural fracture plane developed within marble-hosted amphibole. The sample was collected from the eastern flank of the Red River shear zone (Luc Yen district), northern Vietnam. The brittle fracturing of amphibole (open fractures were filled by calcite, which deforms plastically) is considered to have occurred at 6 km depth at 25 Ma, based on geological criteria. 4. Order of stress magnitude in continental crust at the depth of the brittle-plastic transition zone Assuming that the fracture behaviour of columnar accessory minerals during the development of microboudinage is independent of the mineral species, the above results raise the possibility that the fracturing of columnar accessory mineral

  1. Matching Accessories

    NSDL National Science Digital Library

    Steven M. Foord (Stevenage; Target Bioinformatics, GlaxoSmithKline Medicine Research Centre REV)

    2003-07-08

    Heterodimerization enhances the complexity of ligand recognition and diversity of signaling responses of heterotrimeric guanine nucleotide-binding protein-coupled receptors (GPCRs). Many accessory proteins (for ion channels or GPCRs) appear to associate with their partners relatively early in the process whereby proteins are transported to the cell surface; their roles in modulating function may have evolved out of simple proximity to a protein that once upon a time they either facilitated or accompanied through the maturation process. The receptor activity-modifying proteins (RAMPs) are a family of single-transmembrane accessory proteins that heterodimerize with GPCRs and, thereby, allow individual GPCRs to recognize multiple ligands and to activate various signaling pathways in response to ligand binding. The M10 family of major histocompatibility complex (MHC) class 1b proteins has recently been shown to associate with murine vomeronasal V2R receptors, as well as to escort them to the cell surface. The exact role of M10 in modulating V2R function (or vice versa) remains to be determined.

  2. Minerals

    MedlinePLUS

    Minerals are important for your body to stay healthy. Your body uses minerals for many different jobs, including building bones, making ... regulating your heartbeat. There are two kinds of minerals: macrominerals and trace minerals. Macrominerals are minerals your ...

  3. The Laser Accessory Market

    NASA Astrophysics Data System (ADS)

    Desai, Ashvin

    1988-09-01

    Wandering through the exhibit hall yesterday, I noticed that if you look at the laser companies and if you look at the accessory companies, there are pretty much the same number of accessory booths as well as the laser companies. There was one difference. Laser company booths are all sexy looking, very flashy, big booths. Whereas if you look at the accessories booths, they were small, not so prominent.

  4. Minerals

    NSDL National Science Digital Library

    2007-12-12

    This site provides an in-depth look at mineral properties and identification. An alphabetical listing of common minerals allows the user to see a picture and view physical properties of the particular mineral. Properties of minerals are explained, including cleavage, hardness, crystal form, and luster. There are also downloadable labs for crystal models and mineral data sheets. Dichotomous and hardness keys are given for easier mineral identification.

  5. Unusual tiny inclusions and accessory minerals: evidence of ultra-deep origin and low-pressure modification of the Luobusa podiform chromitites

    NASA Astrophysics Data System (ADS)

    Yamamoto, S.; Komiya, T.; Maruyama, S.

    2014-12-01

    Podiform chromitites in Luobusa ophiolite, southern Tibet, yield a wide variety of unusual minerals, including UHP minerals (micro-diamond, coesite, moissanite), highly reduced minerals (native elements, carbide, nitride, alloys), and crustal minerals (quartz, kyanite, zircon etc.). We report unusual silicate exsolution lamellae (coesite, clinopyroxene and MgSiO3 phase) in chromite (Yamamoto et al., 2009), and unusual ancient crustal zircons from chromitites (Yamamoto et al., 2013). To deduce long history of mantle convection, including both upward mantle-upwelling and horizontal movement, micro-inclusions preserved in refractory minerals can provide potential mineralogical and geochemical evidence. Coesite as an exsolution in chromite is diagnostic UHP evidence and clinopyroxene exsolution in chromite is possible evidence of former CF-type high-pressure polymorph of chromite (>380 km deep). More importantly, we found that silicate exsolutions in chromites are restricted in the nodular- and massive-type chromites, and that disseminated-type chromites have no exsolutions. Petrographically, nodular-type chromites with abundant silicate-exsolutions are gradually modified into disseminated-type chromites in their morphology and exsolution abundance. The characteristic of the disseminated-type chromite, such as their interstitial distribution, euhedral to subhedral morphology and absence of silicate-exsolutions, suggest their formation under the low-pressure magmatic conditions. Therefore, we propose that the podiform chromitites at the Luobusa retain evidence of their multi-stage development from ultrahigh-pressure environment to low-pressure magmatic processes, and tiny inclusions shielded by refractory minerals, such as chromite, diamond and zircon, record their prolonged history in the mantle.

  6. Accessories Around the Clock. 

    E-print Network

    Boyles, Rheba Merle; Hard, Graham; Roberson, Nena; Eaton, Fannie Brown

    1958-01-01

    Accessories Around the Clock RHEBA MERLE BOYLES GRAHAM HARD NENA ROBERSON FANNIE BROWN EATON Extension Clothing Specialists k. The Texas A. a M. College System 2? well-dressed woman of today believes a wardrobe of fewer q, well chosen...

  7. Minerals

    NSDL National Science Digital Library

    Mrs. Walls

    2011-01-30

    Create a poster about minerals! Directions: Make a poster about minerals. (20 points) Include at least (1) large picture (15 points) on your poster complete with labels of every part (10 points). (15 points) Include at least three (3) facts about minerals. (5 points each) (15 points) Write at ...

  8. Accessories Around the Clock.

    E-print Network

    Boyles, Rheba Merle; Hard, Graham; Roberson, Nena; Eaton, Fannie Brown

    1958-01-01

    ~t~.~~, r as the basic garment; varied colors I be used in smaller, less expensive ac- jories. Good leather bags, gloves and - rather than na Ies are a park of a well-dressed person, - smoothiy. fmishd. >Q. . . . .- . A should .;b= considered...~~i The effect usually is spotted if two bright-colored matching 4 are worn at one time. One brighd accessory often is smarter than @ the other accessories harmonizing If a brilliant hat is worn wih a bl wear dark shoes and bag. 'a 1 Gloves may match...

  9. Spinal accessory nerve injury.

    PubMed

    Wiater, J M; Bigliani, L U

    1999-11-01

    Injury to the spinal accessory nerve can lead to dysfunction of the trapezius. The trapezius is a major scapular stabilizer and is composed of three functional components. It contributes to scapulothoracic rhythm by elevating, rotating, and retracting the scapula. The superficial course of the spinal accessory nerve in the posterior cervical triangle makes it susceptible to injury. Iatrogenic injury to the nerve after a surgical procedure is one of the most common causes of trapezius palsy. Dysfunction of the trapezius can be a painful and disabling condition. The shoulder droops as the scapula is translated laterally and rotated downward. Patients present with an asymmetric neckline, a drooping shoulder, winging of the scapula, and weakness of forward elevation. Evaluation should include a complete electrodiagnostic examination. If diagnosed within 1 year of the injury, microsurgical reconstruction of the nerve should be considered. Conservative treatment of chronic trapezius paralysis is appropriate for older patients who are sendentary. Active and healthy patients in whom 1 year of conservative treatment has failed are candidates for surgical reconstruction. Studies have shown the Eden-Lange procedure, in which the insertions of the levator scapulae, rhomboideus minor, and rhomboideus major muscles are transferred, relieves pain, corrects deformity, and improves function in patients with irreparable injury to the spinal accessory nerve. PMID:10613148

  10. minerals

    NASA Astrophysics Data System (ADS)

    Wildner, Manfred; Giester, Gerald; Kersten, Monika; Langer, Klaus

    2014-10-01

    Polarized electronic absorption spectra of colourless chalcocyanite, CuSO4, have been measured using microscope-spectrometric techniques. The spectra are characterized by a structured and clearly polarized band system in the near-infrared spectral range with components centred at 11,720, 10,545, 9,100, and 7,320 cm-1, which have been assigned to crystal field d- d transitions of Cu2+ cations in pseudo-tetragonally elongated CuO6 polyhedra with point symmetry C i (). The polarization behaviour is interpreted based on a D 2( C 2?) pseudo-symmetry. Crystal field calculations were performed for the actual triclinic point symmetry by applying the Superposition Model of crystal fields, as well as in terms of a `classic' pseudo-tetragonal crystal field approach yielding the parameters Dq (eq) = 910, Dt = 395, and Ds = 1,336 cm-1, corresponding to a cubically averaged Dq cub = 679 cm-1. A comparative survey on crystal fields in Cu2+ minerals shows that the low overall crystal field strength in chalcocyanite, combined with a comparatively weak pseudo-tetragonal splitting of energy levels, is responsible for its unique colourless appearance among oxygen-based Cu2+ minerals. The weak crystal field in CuSO4 can be related to the lower position of the SO4 2- anion compared to, e.g. the H2O molecule in the spectrochemical series of ligands.

  11. 14 CFR 33.25 - Accessory attachments.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...accessory drive and mounting attachments loaded. Each engine accessory drive and mounting attachment must include provisions...A drive and mounting attachment requiring lubrication...to prevent unacceptable loss of oil and to...

  12. BA (Hons) Fashion Accessory Design Course content

    E-print Network

    Evans, Paul

    BA (Hons) Fashion Accessory Design Course content Year One During the first year you will be introduced to the fundamentals of the fashion accessory design process. Year One modules Design Principles and an understanding of the design process. Lectures during this module will introduce key ideas in fashion accessory

  13. news update Fashion Accessory Design

    E-print Network

    Evans, Paul

    news update let's talk Fashion Accessory Design Fashion Design Fashion Knitwear Design and Knitted-year Fashion Knitwear Design and Knitted Textiles student Thea Sanders won the top knitwear prize at the event) Fashion Design student Adnan Ebo, whose bold prints were a hot topic during the event. Adnan's work even

  14. 21 CFR 890.3910 - Wheelchair accessory.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3910 Wheelchair accessory. (a) Identification. A...

  15. 21 CFR 890.3910 - Wheelchair accessory.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3910 Wheelchair accessory. (a) Identification. A...

  16. 21 CFR 890.3910 - Wheelchair accessory.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3910 Wheelchair accessory. (a) Identification....

  17. 21 CFR 890.3910 - Wheelchair accessory.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3910 Wheelchair accessory. (a) Identification....

  18. 21 CFR 890.3910 - Wheelchair accessory.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3910 Wheelchair accessory. (a) Identification....

  19. Advanced Accessory Power Supply Topologies

    SciTech Connect

    Marlino, L.D.

    2010-06-15

    This Cooperative Research and Development Agreement (CRADA) began December 8, 2000 and ended September 30, 2009. The total funding provided by the Participant (General Motors Advanced Technology Vehicles [GM]) during the course of the CRADA totaled $1.2M enabling the Contractor (UT-Battelle, LLC [Oak Ridge National Laboratory, a.k.a. ORNL]) to contribute significantly to the joint project. The initial task was to work with GM on the feasibility of developing their conceptual approach of modifying major components of the existing traction inverter/drive to develop low cost, robust, accessory power. Two alternate methods for implementation were suggested by ORNL and both were proven successful through simulations and then extensive testing of prototypes designed and fabricated during the project. This validated the GM overall concept. Moreover, three joint U.S. patents were issued and subsequently licensed by GM. After successfully fulfilling the initial objective, the direction and duration of the CRADA was modified and GM provided funding for two additional tasks. The first new task was to provide the basic development for implementing a cascaded inverter technology into hybrid vehicles (including plug-in hybrid, fuel cell, and electric). The second new task was to continue the basic development for implementing inverter and converter topologies and new technology assessments for hybrid vehicle applications. Additionally, this task was to address the use of high temperature components in drive systems. Under this CRADA, ORNL conducted further research based on GM’s idea of using the motor magnetic core and windings to produce bidirectional accessory power supply that is nongalvanically coupled to the terminals of the high voltage dc-link battery of hybrid vehicles. In order not to interfere with the motor’s torque, ORNL suggested to use the zero-sequence, highfrequency harmonics carried by the main fundamental motor current for producing the accessory power. Two studies were conducted at ORNL. One was to put an additional winding in the motor slots to magnetically link with the high frequency of the controllable zero-sequence stator currents that do not produce any zero-sequence harmonic torques. The second approach was to utilize the corners of the square stator punching for the high-frequency transformers of the dc/dc inverter. Both approaches were successful. This CRADA validated the feasibility of GM’s desire to use the motor’s magnetic core and windings to produce bidirectional accessory power supply. Three joint U.S. patents with GM were issued to ORNL and GM by the U.S. Patent Office for the research results produced by this CRADA.

  20. 19 CFR 10.920 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... false Accessories, spare parts, or tools. 10.920 Section 10.920 Customs...10.920 Accessories, spare parts, or tools. (a) General. Accessories, spare parts, or tools that are delivered with a good and...

  1. 19 CFR 10.537 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Accessories, spare parts, or tools. 10.537 Section 10.537 Customs Duties... § 10.537 Accessories, spare parts, or tools. Accessories, spare parts, or tools that are delivered with a good and that...

  2. 19 CFR 10.920 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... false Accessories, spare parts, or tools. 10.920 Section 10.920 Customs...10.920 Accessories, spare parts, or tools. (a) General. Accessories, spare parts, or tools that are delivered with a good and...

  3. 19 CFR 10.537 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Accessories, spare parts, or tools. 10.537 Section 10.537 Customs Duties... § 10.537 Accessories, spare parts, or tools. Accessories, spare parts, or tools that are delivered with a good and that...

  4. 19 CFR 10.1020 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... false Accessories, spare parts, or tools. 10.1020 Section 10.1020 Customs...10.1020 Accessories, spare parts, or tools. (a) General. Accessories, spare parts, or tools that are delivered with a good and...

  5. 19 CFR 10.537 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Accessories, spare parts, or tools. 10.537 Section 10.537 Customs Duties... § 10.537 Accessories, spare parts, or tools. Accessories, spare parts, or tools that are delivered with a good and that...

  6. 19 CFR 10.1020 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... false Accessories, spare parts, or tools. 10.1020 Section 10.1020 Customs...10.1020 Accessories, spare parts, or tools. (a) General. Accessories, spare parts, or tools that are delivered with a good and...

  7. 19 CFR 10.537 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Accessories, spare parts, or tools. 10.537 Section 10.537 Customs Duties... § 10.537 Accessories, spare parts, or tools. Accessories, spare parts, or tools that are delivered with a good and that...

  8. 19 CFR 10.920 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... false Accessories, spare parts, or tools. 10.920 Section 10.920 Customs...10.920 Accessories, spare parts, or tools. (a) General. Accessories, spare parts, or tools that are delivered with a good and...

  9. 14 CFR 23.1192 - Engine accessory compartment diaphragm.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...false Engine accessory compartment diaphragm. 23.1192...Powerplant Powerplant Fire Protection § 23.1192 Engine accessory compartment diaphragm. For...from the engine accessory compartment by a diaphragm that...

  10. 14 CFR 23.1192 - Engine accessory compartment diaphragm.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...false Engine accessory compartment diaphragm. 23.1192...Powerplant Powerplant Fire Protection § 23.1192 Engine accessory compartment diaphragm. For...from the engine accessory compartment by a diaphragm that...

  11. 14 CFR 23.1192 - Engine accessory compartment diaphragm.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...false Engine accessory compartment diaphragm. 23.1192...Powerplant Powerplant Fire Protection § 23.1192 Engine accessory compartment diaphragm. For...from the engine accessory compartment by a diaphragm that...

  12. 14 CFR 23.1192 - Engine accessory compartment diaphragm.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...false Engine accessory compartment diaphragm. 23.1192...Powerplant Powerplant Fire Protection § 23.1192 Engine accessory compartment diaphragm. For...from the engine accessory compartment by a diaphragm that...

  13. 14 CFR 23.1192 - Engine accessory compartment diaphragm.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...false Engine accessory compartment diaphragm. 23.1192...Powerplant Powerplant Fire Protection § 23.1192 Engine accessory compartment diaphragm. For...from the engine accessory compartment by a diaphragm that...

  14. Characterization of a Lolium multiflorum Accessory Chromosome

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Accessory chromosomes, also called B-chromosomes, have been reported in more than 1300 species of plants. Accessory chromosomes show numerical polymorphism and when present in high number, are known to negatively affect the growth and vigor of the plants, while in low numbers they may be beneficial...

  15. 21 CFR 864.3600 - Microscopes and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES HEMATOLOGY AND PATHOLOGY DEVICES Pathology Instrumentation and Accessories § 864.3600 Microscopes and accessories. (a)...

  16. 21 CFR 864.3600 - Microscopes and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES HEMATOLOGY AND PATHOLOGY DEVICES Pathology Instrumentation and Accessories § 864.3600 Microscopes and accessories. (a)...

  17. 21 CFR 864.3600 - Microscopes and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES HEMATOLOGY AND PATHOLOGY DEVICES Pathology Instrumentation and Accessories § 864.3600 Microscopes and accessories. (a)...

  18. 21 CFR 864.3600 - Microscopes and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES HEMATOLOGY AND PATHOLOGY DEVICES Pathology Instrumentation and Accessories § 864.3600 Microscopes and accessories. (a)...

  19. Accessory tragus: a dentist's perspective

    PubMed Central

    Khandelwal, Vishal; Banda, Naveen Reddy; Nayak, Ullal Anand; Banda, Vanaja Reddy

    2013-01-01

    Accessory tragus (AT) also referred as preauricular tag is a rudimentary tag of ear tissue This paper presents two specific cases: one hereditary and another sporadic case of AT. A general clinical description of AT, its associated syndromes, embryology aetiopathogenesis and management is discussed. A dentist can play an important role in spotting the AT during their head and neck examination. The presence of this defect can be correlated to other congenital defects of first branchial arch. On recognising its occurrence, the dentist can refer to a specialist for thorough investigation management. A dentist can play a vital role in encouraging and counselling the parents for the correction of such defects as it improves the aesthetics of the face. Usually, children with these defects are often targets of teasing by peers. PMID:23761605

  20. Physical Properties of the Interface between a Mineral Inclusion and the Host Mineral: Monazite Inclusions in Fluorapatite

    Microsoft Academic Search

    D. E. Harlov; R. Wirth; H. Foerster

    2003-01-01

    The (Y+REE) chemistry of many metamorphic and igneous rocks is primarily controlled by phosphate-bearing accessory minerals such as fluorapatite and monazite. Studies of natural fluorapatite (Harlov and Foerster (2002) J Petrol 43, 801) as well as experimental investigations of chlorapatite (Harlov et al. (2002) Am Mineral 87, 245) and fluorapatite (Harlov et al. (2003) Am Mineral, 88, 1209) indicate that

  1. Trace elements and accessory minerals in lunar samples.

    PubMed

    Reed, G W; Jovanovic, S; Fuchs, L H

    1970-01-30

    Halogen contents similar to those in meteorites are reported in Apollo 11 samples. Concentrations of 0.6 to 13 parts mercury, 0.2 to 0.8 part uranium, 1 to 17 parts lithium, and 1 to 800 parts osmium per million and 0.5 to 1 percent chromium oxide by weight have been measured. In contrast to meteorites and terrestrial rocks a large mercury release below 110 degrees C is observed. Some implications of these results are presented. Fluorapatite, quartz, tridymite, fayalite, and iron-rich, manganese-poor pyroxmangite, previously unreported, have been identified. The small amount of fluorapatite found does not account for the fluorine contents. PMID:17781470

  2. 21 CFR 872.6640 - Dental operative unit and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Dental operative unit and accessories. 872...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6640 Dental operative unit and accessories....

  3. 21 CFR 872.3980 - Endosseous dental implant accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Endosseous dental implant accessories. 872.3980...AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3980 Endosseous dental implant accessories. (a)...

  4. 21 CFR 872.4200 - Dental handpiece and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Dental handpiece and accessories. 872.4200...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4200 Dental handpiece and accessories. (a)...

  5. 21 CFR 872.6250 - Dental chair and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Dental chair and accessories. 872.6250...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6250 Dental chair and accessories. (a)...

  6. 21 CFR 872.4200 - Dental handpiece and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Dental handpiece and accessories. 872.4200...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4200 Dental handpiece and accessories. (a)...

  7. 21 CFR 872.4200 - Dental handpiece and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Dental handpiece and accessories. 872.4200...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4200 Dental handpiece and accessories. (a)...

  8. 21 CFR 872.6250 - Dental chair and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Dental chair and accessories. 872.6250...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6250 Dental chair and accessories. (a)...

  9. 21 CFR 872.3980 - Endosseous dental implant accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Endosseous dental implant accessories. 872.3980...AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3980 Endosseous dental implant accessories. (a)...

  10. 21 CFR 872.6640 - Dental operative unit and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Dental operative unit and accessories. 872...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6640 Dental operative unit and accessories....

  11. 21 CFR 872.6640 - Dental operative unit and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Dental operative unit and accessories. 872...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6640 Dental operative unit and accessories....

  12. 21 CFR 872.4200 - Dental handpiece and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Dental handpiece and accessories. 872.4200...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4200 Dental handpiece and accessories. (a)...

  13. 21 CFR 872.3980 - Endosseous dental implant accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Endosseous dental implant accessories. 872.3980...AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3980 Endosseous dental implant accessories. (a)...

  14. 21 CFR 872.4200 - Dental handpiece and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Dental handpiece and accessories. 872.4200...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4200 Dental handpiece and accessories. (a)...

  15. 21 CFR 872.3980 - Endosseous dental implant accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Endosseous dental implant accessories. 872.3980...AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3980 Endosseous dental implant accessories. (a)...

  16. 21 CFR 872.6640 - Dental operative unit and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Dental operative unit and accessories. 872...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6640 Dental operative unit and accessories....

  17. 21 CFR 872.3980 - Endosseous dental implant accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Endosseous dental implant accessories. 872.3980...AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3980 Endosseous dental implant accessories. (a)...

  18. 21 CFR 872.6250 - Dental chair and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Dental chair and accessories. 872.6250...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6250 Dental chair and accessories. (a)...

  19. 21 CFR 872.6640 - Dental operative unit and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Dental operative unit and accessories. 872...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6640 Dental operative unit and accessories....

  20. 21 CFR 872.6250 - Dental chair and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Dental chair and accessories. 872.6250...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6250 Dental chair and accessories. (a)...

  1. 21 CFR 872.6250 - Dental chair and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Dental chair and accessories. 872.6250...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6250 Dental chair and accessories. (a)...

  2. 19 CFR 10.537 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. United States-Singapore Free Trade Agreement Rules of Origin § 10.537 Accessories, spare parts, or tools. Accessories, spare parts, or tools that are...

  3. 19 CFR 10.456 - Accessories, spare parts or tools.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. United States-Chile Free Trade Agreement Rules of Origin § 10.456 Accessories, spare parts or tools. Accessories, spare parts or tools that form part of the...

  4. 19 CFR 10.456 - Accessories, spare parts or tools.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Accessories, spare parts or tools. 10.456 Section 10.456 Customs Duties...Origin § 10.456 Accessories, spare parts or tools. Accessories, spare parts or tools that form part of the good's standard...

  5. 19 CFR 10.456 - Accessories, spare parts or tools.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Accessories, spare parts or tools. 10.456 Section 10.456 Customs Duties...Origin § 10.456 Accessories, spare parts or tools. Accessories, spare parts or tools that form part of the good's standard...

  6. 19 CFR 10.456 - Accessories, spare parts or tools.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Accessories, spare parts or tools. 10.456 Section 10.456 Customs Duties...Origin § 10.456 Accessories, spare parts or tools. Accessories, spare parts or tools that form part of the good's standard...

  7. Detection of accessory spleens with indium 111-labeled autologous platelets

    Microsoft Academic Search

    Harmon H. Davis; Ajit Varki; W. A. Heaton; B. A. Siegel

    1980-01-01

    In two patients with recurrent immune thrombocytopenia, accessory splenic tissue was demonstrated by radionuclide imaging following administration of indium 111-labeled autologous platelets. In one of these patients, no accessory splenic tissue was seen on images obtained with technetium 99m sulfur colloid. This new technique provides a simple means for demonstrating accessory spleens and simultaneously evaluating the life-span of autologous platelets.

  8. Multiple ancient schwannoma of the accessory nerve: a case report.

    PubMed

    George, N A; Balagopal, P G; Somanath, T; Sebastian, P

    2012-01-01

    We are reporting a case of multiple ancient schwannoma of the accessory nerve in a 57 year old male. Accessory schwannomas are rare with only 19 cases reported in literature so far. Ancient schwannoma is even rarer in the head and neck region with no other cases associated with the accessory nerve being reported in literature so far. PMID:22227549

  9. Important Information ................................... 2 ~ 3 Supplied Accessories ......................................... 3

    E-print Network

    Kleinfeld, David

    Accessories ......................................... 3 · Before Operating Your Television includes basic operating instructions in Spanish and French. SPANISH is on page 6, 27. FRENCH is on page 7 TELEVISION MODELS 13N-M100 13N-M150 B #12;2 Welcome to the SHARP Family.We are pleased that you are now

  10. Surgical management of accessory parotid tumors.

    PubMed

    Rodino, W; Shaha, A R

    1993-11-01

    Accessory parotid gland tumors are defined as masses within salivary gland tissue located adjacent to Stensen's duct, but separate from the main body of the parotid gland. These tumors usually present as asymptomatic cheek masses. There is a temptation to excise these masses locally; however, the likelihood of injury to branches of the facial nerve is high. The best surgical approach to tumors in the accessory parotid region is via a standard parotid incision and concomitant superficial parotidectomy. Eight patients have been surgically treated with accessory parotid gland masses. Six patients had mixed tumors, one had a low grade mucoepidermoid carcinoma, and one had a localized parotitis. Our approach included a standard parotid incision, raising an anterior flap beyond the mass, and exposing the main trunk of the facial nerve, with careful tracing of all its branches. This approach to accessory parotid gland tumors is superior in that it provides a better margin of resection and minimizes functional and cosmetic deformities. Most importantly, there is less danger of injury to branches of the facial nerve. PMID:8412169

  11. Electronic Position Sensor for Power Operated Accessory

    DOEpatents

    Haag, Ronald H.; Chia, Michael I.

    2005-05-31

    An electronic position sensor for use with a power operated vehicle accessory, such as a power liftgate. The position sensor includes an elongated resistive circuit that is mounted such that it is stationary and extends along the path of a track portion of the power operated accessory. The position sensor further includes a contact nub mounted to a link member that moves within the track portion such that the contact nub is slidingly biased against the elongated circuit. As the link member moves under the force of a motor-driven output gear, the contact nub slides along the surface of the resistive circuit, thereby affecting the overall resistance of the circuit. The position sensor uses the overall resistance to provide an electronic position signal to an ECU, wherein the signal is indicative of the absolute position of the power operated accessory. Accordingly, the electronic position sensor is capable of providing an electronic signal that enables the ECU to track the absolute position of the power operated accessory.

  12. Accessories to the crime: Recent advances in HIV accessory protein biology

    Microsoft Academic Search

    Thomas Gramberg; Nicole Sunseri; Nathaniel R. Landau

    2009-01-01

    Recent advances in understanding the roles of the lentiviral accessory proteins have provided fascinating insight into the\\u000a molecular biology of the virus and uncovered previously unappreciated innate immune mechanisms by which the host defends itself.\\u000a HIV-1 and other lentiviruses have developed accessory proteins that counterattack the antiviral defenses in a sort of evolutionary\\u000a battle. The virus is remarkably adept at

  13. Atrioventricular accessory pathway with anterograde decremental conduction property

    PubMed Central

    Fujita, Satoshi; Fujii, Eitaro; Sugiura, Shinya; Ito, Masaaki

    2013-01-01

    We report a case of atrioventricular (AV) accessory pathway with anterograde decremental conduction property. The ? wave polarity suggested the presence of a right posteroseptal accessory AV pathway. During atrial pacing, Wenckebach-type AV block over the accessory pathway was observed with prolongation of the local AV conduction time without the change in QRS morphology. No retrograde ventriculoatrial conduction was observed. During mapping of the right midseptal area, mechanical conduction block at the level of the proximal input to the accessory pathway was induced repeatedly by catheter manipulation. Radiofrequency energy delivery eliminated the accessory pathway. In this case only the bump phenomenon was the best marker of successful ablation. PMID:23780770

  14. Flow Chart for Mineral Separation from Granitic Rocks.

    ERIC Educational Resources Information Center

    Mursky, Gregory

    1987-01-01

    Provided is a flow chart for the separation and purification of major, minor, and accessory minerals from granitic rocks. With careful use of heavy liquids, and a Franz Isodynamic Magnetic Separator, it is possible to obtain mineral concentrates with a purity of 95 percent or better. (Author/RH)

  15. Algal Accessory Pigment Detection Using AVIRIS Image-Derived Spectral Radiance Data

    NASA Technical Reports Server (NTRS)

    Richardson, Laurie L.; Ambrosia, Vincent G.

    1996-01-01

    Visual and derivative analyses of AVIRIS spectral data can be used to detect algal accessory pigments in aquatic communities. This capability extends the use of remote sensing for the study of aquatic ecosystems by allowing detection of taxonomically significant pigment signatures which yield information about the type of algae present. Such information allows remote sensing-based assessment of aquatic ecosystem health, as in the detection of nuisance blooms of cyanobacteria or toxic blooms of dinoflagellates. Remote sensing of aquatic systems has traditionally focused on quantification of chlorophyll a, a photoreactive (and light-harvesting) pigment which is common to all algae as well as cyanobacteria (bluegreen algae). Due to the ubiquitousness of this pigment within algae, chl a is routinely measured to estimate algal biomass both during ground-truthing and using various airborne or satellite based sensors, including AVIRIS. Within the remote sensing and aquatic sciences communities, ongoing research has been performed to detect algal accessory pigments for assessment of algal population composition. This research is based on the fact that many algal accessory pigments are taxonomically significant, and all are spectrally unique. Aquatic scientists have been refining pigment analysis techniques, primarily high performance liquid chromatography, or HPLC, to detect specific pigments as a time-saving alternative to individual algal cell identifications and counts. Remote sensing scientists are investigating the use of pigment signatures to construct pigment libraries analogous to mineral spectral libraries used in geological remote sensing applications. The accessory pigment approach has been used successfully in remote sensing using data from the Thematic Mapper, low-altitude, multiple channel scanners, field spectroradiometers and the AVIRIS hyperspectral scanner. Due to spectral and spatial resolution capabilities, AVIRIS is the sensor of choice for such studies. We present here our results on detection of algal accessory pigments using AVIRIS data.

  16. HIV Accessory Proteins versus Host Restriction Factors

    PubMed Central

    Strebel, Klaus

    2013-01-01

    Primate immunodeficiency viruses, including HIV-1, are characterized by the presence of accessory genes such as vif, vpr, vpx, vpu, and nef. Current knowledge indicates that none of the primate lentiviral accessory proteins has enzymatic activity. Instead, these proteins interact with cellular ligands to either act as adapter molecules to redirect the normal function of host factors for virus-specific purposes or to inhibit a normal host function by mediating degradation or causing intracellular mislocalization/sequestration of the factors involved. This review aims at providing an update of our current understanding of how Vif, Vpu, and Vpx control the cellular restriction factors APOBEC3G, BST-2, and SAMHD1, respectively. PMID:24246762

  17. [Accessory renal arteries in human fetuses].

    PubMed

    Go?cicka, D; Szpinda, M; Kochan, J

    1996-12-01

    Using conventional anatomical methods, renal arteries of 140 human fetuses were studied. It was found (21.1%) that the accessory renal arteries occurred in a three-fold manner: 1. as single arteries (19.2%), 2. as double arteries (2.1%) and 3. as triplex arteries (0.7%). More often they originated from the right part of the circumference of the abdominal aorta, mainly in the female fetuses. These arteries penetrated the following segments of the kidney: the inferior (12.9%), the superior (2.3%), the anterior inferior (2.8%), the posterior (2.1%) and the anterior superior (1.5%). They crossed the renal pelvis more often in front (12.2%) than from behind of it (5%). The frequency of the occurrence of the accessory arteries depends not from the age of the fetus. PMID:9082875

  18. Bacteriophage P22 accessory recombination function

    Microsoft Academic Search

    Anthony R. Poteete; Anita C. Fenton; Arlene Semerjian

    1991-01-01

    The accessory recombination function (arf) gene of bacteriophage P22 is located immediately upstream of the essential recombination function (erf) gene. Three mutant alleles of arf were constructed and installed in P22 in place of the wild-type allele: an out-of-frame internal deletion, an in-frame internal deletion, and an amber mutation. The deletion mutant phages are partially defective in homologous recombination and

  19. Magnetite composition in Ni-Cu-PGE deposits worldwide: application to mineral exploration

    E-print Network

    Magnetite composition in Ni-Cu-PGE deposits worldwide: application to mineral exploration Emilie October 2013 Accepted 13 May 2014 Available online 21 May 2014 Keywords: Magnetite Ni Cu Sulfides Mineral in the exploration of ore deposits. Magnetite is a common accessory mineral in magmatic Ni­Cu­Platinum-Group Element

  20. 21 CFR 890.3025 - Prosthetic and orthotic accessory.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3025 Prosthetic and orthotic accessory. (a)...

  1. 21 CFR 876.1500 - Endoscope and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Diagnostic Devices § 876.1500 Endoscope and accessories. (a) Identification. An...

  2. 21 CFR 876.5980 - Gastrointestinal tube and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5980 Gastrointestinal tube and accessories. (a)...

  3. 21 CFR 876.5090 - Suprapubic urological catheter and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5090 Suprapubic urological catheter and accessories. (a)...

  4. 21 CFR 876.4300 - Endoscopic electrosurgical unit and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4300 Endoscopic electrosurgical unit and accessories. (a)...

  5. 21 CFR 876.5630 - Peritoneal dialysis system and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5630 Peritoneal dialysis system and accessories. (a)...

  6. 21 CFR 876.1500 - Endoscope and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Diagnostic Devices § 876.1500 Endoscope and accessories. (a) Identification. An...

  7. 21 CFR 876.5090 - Suprapubic urological catheter and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5090 Suprapubic urological catheter and accessories. (a)...

  8. 21 CFR 876.5130 - Urological catheter and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5130 Urological catheter and accessories. (a) Identification....

  9. 21 CFR 876.5090 - Suprapubic urological catheter and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5090 Suprapubic urological catheter and accessories. (a)...

  10. 21 CFR 876.5630 - Peritoneal dialysis system and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5630 Peritoneal dialysis system and accessories. (a)...

  11. 21 CFR 876.5820 - Hemodialysis system and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5820 Hemodialysis system and accessories. (a) Identification....

  12. 21 CFR 876.1500 - Endoscope and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Diagnostic Devices § 876.1500 Endoscope and accessories. (a) Identification. An...

  13. 21 CFR 876.5090 - Suprapubic urological catheter and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5090 Suprapubic urological catheter and accessories. (a)...

  14. 21 CFR 876.5980 - Gastrointestinal tube and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5980 Gastrointestinal tube and accessories. (a)...

  15. 21 CFR 876.5630 - Peritoneal dialysis system and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5630 Peritoneal dialysis system and accessories. (a)...

  16. 21 CFR 876.5820 - Hemodialysis system and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5820 Hemodialysis system and accessories. (a) Identification....

  17. 21 CFR 876.4300 - Endoscopic electrosurgical unit and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4300 Endoscopic electrosurgical unit and accessories. (a)...

  18. 21 CFR 876.1500 - Endoscope and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Diagnostic Devices § 876.1500 Endoscope and accessories. (a) Identification. An...

  19. 21 CFR 876.1500 - Endoscope and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Diagnostic Devices § 876.1500 Endoscope and accessories. (a) Identification. An...

  20. 21 CFR 876.4300 - Endoscopic electrosurgical unit and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4300 Endoscopic electrosurgical unit and accessories. (a)...

  1. 21 CFR 876.5630 - Peritoneal dialysis system and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5630 Peritoneal dialysis system and accessories. (a)...

  2. 21 CFR 876.5820 - Hemodialysis system and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5820 Hemodialysis system and accessories. (a) Identification....

  3. 21 CFR 876.5130 - Urological catheter and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5130 Urological catheter and accessories. (a) Identification....

  4. 21 CFR 876.5130 - Urological catheter and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5130 Urological catheter and accessories. (a) Identification....

  5. 21 CFR 876.5820 - Hemodialysis system and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5820 Hemodialysis system and accessories. (a) Identification....

  6. 21 CFR 876.5090 - Suprapubic urological catheter and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5090 Suprapubic urological catheter and accessories. (a)...

  7. 21 CFR 876.5980 - Gastrointestinal tube and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5980 Gastrointestinal tube and accessories. (a)...

  8. 21 CFR 876.5980 - Gastrointestinal tube and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5980 Gastrointestinal tube and accessories. (a)...

  9. 21 CFR 876.5980 - Gastrointestinal tube and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5980 Gastrointestinal tube and accessories. (a)...

  10. 21 CFR 876.5630 - Peritoneal dialysis system and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5630 Peritoneal dialysis system and accessories. (a)...

  11. 21 CFR 876.5130 - Urological catheter and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5130 Urological catheter and accessories. (a) Identification....

  12. 21 CFR 876.5130 - Urological catheter and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5130 Urological catheter and accessories. (a) Identification....

  13. 21 CFR 876.4300 - Endoscopic electrosurgical unit and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4300 Endoscopic electrosurgical unit and accessories. (a)...

  14. 21 CFR 876.4300 - Endoscopic electrosurgical unit and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4300 Endoscopic electrosurgical unit and accessories. (a)...

  15. 21 CFR 876.5820 - Hemodialysis system and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5820 Hemodialysis system and accessories. (a) Identification....

  16. 21 CFR 890.3025 - Prosthetic and orthotic accessory.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3025 Prosthetic and orthotic accessory. (a)...

  17. 21 CFR 890.3025 - Prosthetic and orthotic accessory.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3025 Prosthetic and orthotic accessory. (a)...

  18. 21 CFR 890.3025 - Prosthetic and orthotic accessory.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3025 Prosthetic and orthotic accessory. (a)...

  19. Non-Azygos Accessory Fissure in Right Upper Lobe Associated with Superior and Inferior Accessory Fissures in Right Lower Lobe

    PubMed Central

    Muttikkal, Thomas Jose Eluvathingal; Deng, Chunli

    2012-01-01

    Accessory fissures in the lungs are common congenital variations, usually detected as incidental findings in radiographs or CT scan. Accessory fissures can act as an anatomic barrier to the spread of inflammatory or neoplastic disease, as well as due to the variant anatomy, mimic lesions. It is important to recognize the presence of accessory fissures, as they affect surgical planning of pulmonary lobectomy and segmentectomy. Accessory fissure in the right upper lobe other than due to the anomalous course of azygos vein is very rare. We report a case of non-azygos accessory fissure, between the apical and the anterior segments of right upper lobe, along with superior and inferior accessory fissures in the right lower lobe. PMID:23393635

  20. 21 CFR 878.4400 - Electrosurgical cutting and coagulation device and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... false Electrosurgical cutting and coagulation device and accessories. 878.4400...4400 Electrosurgical cutting and coagulation device and accessories. (a) Identification. An electrosurgical cutting and coagulation device and accessories is a...

  1. 21 CFR 878.4400 - Electrosurgical cutting and coagulation device and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... false Electrosurgical cutting and coagulation device and accessories. 878.4400...4400 Electrosurgical cutting and coagulation device and accessories. (a) Identification. An electrosurgical cutting and coagulation device and accessories is a...

  2. 21 CFR 878.4400 - Electrosurgical cutting and coagulation device and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... false Electrosurgical cutting and coagulation device and accessories. 878.4400...4400 Electrosurgical cutting and coagulation device and accessories. (a) Identification. An electrosurgical cutting and coagulation device and accessories is a...

  3. 21 CFR 878.4400 - Electrosurgical cutting and coagulation device and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... false Electrosurgical cutting and coagulation device and accessories. 878.4400...4400 Electrosurgical cutting and coagulation device and accessories. (a) Identification. An electrosurgical cutting and coagulation device and accessories is a...

  4. 21 CFR 878.4400 - Electrosurgical cutting and coagulation device and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... false Electrosurgical cutting and coagulation device and accessories. 878.4400...4400 Electrosurgical cutting and coagulation device and accessories. (a) Identification. An electrosurgical cutting and coagulation device and accessories is a...

  5. Simon Effect with and without Awareness of the Accessory Stimulus

    ERIC Educational Resources Information Center

    Treccani, Barbara; Umilta, Carlo; Tagliabue, Mariaelena

    2006-01-01

    The authors investigated whether a Simon effect could be observed in an accessory-stimulus Simon task when participants were unaware of the task-irrelevant accessory cue. In Experiment 1A a central visual target was accompanied by a suprathreshold visual lateral cue. A regular Simon effect (i.e., faster cue-response corresponding reaction times…

  6. Accessory bronchus in a patient with chronic cough.

    PubMed

    Rodríguez-Fuentes, Raúl; Esparza, Edgar A; Macías, Marco P; Quiroz-Castro, Oscar

    2013-04-01

    The accessory bronchus involving the trachea or main bronchi is very rare. In this report, we present images of an accessory bronchus, detected by computed tomography scan and flexible bronchoscopy. Our patient was suffering from persistent productive cough and had normal chest x-ray. We review the literature to establish relationship between our patient's symptoms and this congenital anomaly. PMID:23609250

  7. Heavy mineral rich beach sands of the Waitakere coast, Auckland, New Zealand

    Microsoft Academic Search

    PAUL F. Hamill; PETER F. Ballance

    1985-01-01

    Heavy mineral rich beach sands of the Tasman Sea coast of the Waitakere Ranges, west of Auckland City, include major minerals plagioclase, augite, titanomagnetite, and quartz, with minor ilmenite, hypersthene, hornblende, biotite, and potassium feldspar, and accessory zircon and apatite. Major sources for the sands are Taupo Volcanic Zone rhyolitic volcanics, delivered via the Waikato River, and Taranaki andesitic volcanics,

  8. 46 CFR 98.25-40 - Valves, fittings, and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...inches. Nonferrous materials, such as copper, copper alloys and aluminum alloys, shall not be used in the construction of valves, fittings or accessory equipment. Brazed joints are prohibited. (b) Each tank shall be provided...

  9. 21 CFR 884.4100 - Endoscopic electrocautery and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...Sterility Review Guidance 2/12/90 (K-90),” and (iii) “Guidance (‘Guidelines’) for Evaluation of Laproscopic Bipolar and Thermal Coagulators (and Accessories),” (2) International Electrotechnical Commission's IEC 60601-1-AM2...

  10. 21 CFR 884.4100 - Endoscopic electrocautery and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...Sterility Review Guidance 2/12/90 (K-90),” and (iii) “Guidance (‘Guidelines’) for Evaluation of Laproscopic Bipolar and Thermal Coagulators (and Accessories),” (2) International Electrotechnical Commission's IEC 60601-1-AM2...

  11. 21 CFR 872.6010 - Abrasive device and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...6010 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6010 Abrasive device and accessories. (a)...

  12. 21 CFR 872.4920 - Dental electrosurgical unit and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Dental electrosurgical unit and accessories...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4920 Dental electrosurgical unit and...

  13. 21 CFR 872.4920 - Dental electrosurgical unit and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Dental electrosurgical unit and accessories...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4920 Dental electrosurgical unit and...

  14. 21 CFR 872.4920 - Dental electrosurgical unit and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Dental electrosurgical unit and accessories...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4920 Dental electrosurgical unit and...

  15. 21 CFR 872.4920 - Dental electrosurgical unit and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Dental electrosurgical unit and accessories...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4920 Dental electrosurgical unit and...

  16. 21 CFR 872.4920 - Dental electrosurgical unit and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Dental electrosurgical unit and accessories...HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Surgical Devices § 872.4920 Dental electrosurgical unit and...

  17. 21 CFR 872.6010 - Abrasive device and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...6010 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6010 Abrasive device and accessories. (a)...

  18. 19 CFR 10.2020 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...HOMELAND SECURITY; DEPARTMENT OF THE TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. United States-Panama Trade Promotion Agreement Rules of Origin § 10.2020 Accessories, spare parts, or tools. (a)...

  19. 21 CFR 872.6010 - Abrasive device and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Abrasive device and accessories. 872.6010 Section 872.6010...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6010...

  20. 21 CFR 872.6010 - Abrasive device and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Abrasive device and accessories. 872.6010 Section 872.6010...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6010...

  1. 21 CFR 876.5010 - Biliary catheter and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5010 Biliary catheter and accessories. (a) Identification. A...

  2. 21 CFR 876.5900 - Ostomy pouch and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5900 Ostomy pouch and accessories. (a) Identification. An...

  3. 21 CFR 876.5900 - Ostomy pouch and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5900 Ostomy pouch and accessories. (a) Identification. An...

  4. 21 CFR 876.5900 - Ostomy pouch and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5900 Ostomy pouch and accessories. (a) Identification. An...

  5. 21 CFR 876.4890 - Urological table and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4890 Urological table and accessories. (a) Identification. A...

  6. 21 CFR 876.4890 - Urological table and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4890 Urological table and accessories. (a) Identification. A...

  7. 21 CFR 876.5010 - Biliary catheter and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5010 Biliary catheter and accessories. (a) Identification. A...

  8. 21 CFR 876.5010 - Biliary catheter and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5010 Biliary catheter and accessories. (a) Identification. A...

  9. 21 CFR 876.5540 - Blood access device and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5540 Blood access device and accessories. (a) Identification....

  10. 21 CFR 876.5540 - Blood access device and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5540 Blood access device and accessories. (a) Identification....

  11. 21 CFR 876.5540 - Blood access device and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5540 Blood access device and accessories. (a) Identification....

  12. 21 CFR 876.5540 - Blood access device and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5540 Blood access device and accessories. (a) Identification....

  13. 21 CFR 876.4890 - Urological table and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4890 Urological table and accessories. (a) Identification. A...

  14. 21 CFR 876.4890 - Urological table and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4890 Urological table and accessories. (a) Identification. A...

  15. 21 CFR 876.5900 - Ostomy pouch and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5900 Ostomy pouch and accessories. (a) Identification. An...

  16. 21 CFR 876.5010 - Biliary catheter and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5010 Biliary catheter and accessories. (a) Identification. A...

  17. 21 CFR 876.5900 - Ostomy pouch and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5900 Ostomy pouch and accessories. (a) Identification. An...

  18. 21 CFR 876.5010 - Biliary catheter and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5010 Biliary catheter and accessories. (a) Identification. A...

  19. 21 CFR 876.5540 - Blood access device and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5540 Blood access device and accessories. (a) Identification....

  20. 21 CFR 876.4890 - Urological table and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4890 Urological table and accessories. (a) Identification. A...

  1. 14 CFR 25.1192 - Engine accessory section diaphragm.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...and all portions of the exhaust system must be isolated from the engine accessory compartment by a diaphragm that complies with the firewall requirements of § 25.1191. [Amdt. 25-23, 35 FR 5678, Apr. 8,...

  2. 14 CFR 25.1192 - Engine accessory section diaphragm.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...and all portions of the exhaust system must be isolated from the engine accessory compartment by a diaphragm that complies with the firewall requirements of § 25.1191. [Amdt. 25-23, 35 FR 5678, Apr. 8,...

  3. 21 CFR 884.1600 - Transabdominal amnioscope (fetoscope) and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...system via abdominal entry. The device is used to ascertain fetal abnormalities, to obtain fetal blood samples, or to obtain fetal tissue. This generic type of device may include the following accessories: trocar and cannula, instruments used...

  4. 19 CFR 10.3020 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...HOMELAND SECURITY; DEPARTMENT OF THE TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. United States-Colombia Trade Promotion Agreement Rules of Origin § 10.3020 Accessories, spare parts, or tools. (a)...

  5. 19 CFR 10.3020 - Accessories, spare parts, or tools.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...HOMELAND SECURITY; DEPARTMENT OF THE TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. United States-Colombia Trade Promotion Agreement Rules of Origin § 10.3020 Accessories, spare parts, or tools. (a)...

  6. 21 CFR 886.1930 - Tonometer and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...flat disk to the cornea). Accessories for the device may include a tonometer calibrator or a tonograph recording system. The device is intended for use in the diagnosis of glaucoma. (b) Classification. Class...

  7. 21 CFR 886.1930 - Tonometer and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...flat disk to the cornea). Accessories for the device may include a tonometer calibrator or a tonograph recording system. The device is intended for use in the diagnosis of glaucoma. (b) Classification. Class...

  8. 21 CFR 886.1930 - Tonometer and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...flat disk to the cornea). Accessories for the device may include a tonometer calibrator or a tonograph recording system. The device is intended for use in the diagnosis of glaucoma. (b) Classification. Class...

  9. An evolutionarily conserved family of accessory subunits of K + channels

    Microsoft Academic Search

    Shi-Qing Cai; Ki Ho Park; Federico Sesti

    2006-01-01

    Accessory subunits are an essential feature of voltage-gated potassium (Kv) channels. They determine trafficking to the plasma\\u000a membrane, surface expression, gating, permeation, and pharmacology. At least three distinct classes of accessory subunits\\u000a including the KCNE family can regulate Kv channel function. KCNE genes encode integral membrane proteins with a single transmembrane\\u000a domain. KCNE genes span the eukaryotic kingdom and, in

  10. Radiofrequency catheter ablation of septal accessory atrioventricular pathways.

    PubMed Central

    Xie, B; Heald, S C; Bashir, Y; Camm, A J; Ward, D E

    1994-01-01

    OBJECTIVE--Septal accessory atrioventricular pathways are recognised as being more difficult to ablate than pathways in other locations. This paper describes an experience of 48 consecutive patients with septal accessory pathways who had catheter ablation with radiofrequency current. PATIENTS AND METHODS--There were 28 male and 20 female patients, mean (SD) age 35 (17). 43 patients had a single accessory pathway and 5 patients had multiple accessory pathways. Pre-excitation was present in 37 patients, and 11 patients had concealed accessory pathways. 21 patients had had a previous electrophysiological study. Catheter ablation was undertaken with radiofrequency current delivered by a standard unipolar technique or by delivery of current across the septum (the bipolar technique). RESULTS--The median total procedure time was 167 (83) minutes including a 30-40 minute observation period after the abolition of conduction by the accessory pathway. The median total fluoroscopic time was 56 (30) minutes. 42 (88%) out of 48 patients had successful ablation of the pathway during the first session. In the six patients in whom the procedure failed, five had a midseptal pathway and one had a right anteroseptal pathway. A second attempt at ablation was made in two patients and succeeded in both. In total, 49 accessory pathways were successfully ablated in 44 (92%) out of 48 patients. The bipolar technique was used in 11 patients and succeeded in 10 patients. Standard unipolar current delivery had previously failed in seven of the 11 patients. Complications developed in two patients with a mid septal pathway (one with complete atrioventricular block and the other with a small pericardial effusion). CONCLUSION--Radiofrequency catheter ablation of septal accessory pathways is efficacious and safe. The procedure time can be shortened and success rate can be increased after improvement of the technique--that is, consideration of a bipolar approach for energy delivery in difficult cases. PMID:7946782

  11. Alveolar macrophage accessory cell function in bronchial asthma.

    PubMed

    Gant, V; Cluzel, M; Shakoor, Z; Rees, P J; Lee, T H; Hamblin, A S

    1992-10-01

    The capacity of peripheral blood monocytes and alveolar macrophages (AM) obtained by bronchoalveolar lavage (BAL) to present recall antigens, namely, tuberculin purified protein derivative (PPD) or streptokinase-streptodornase (SKSD), to highly purified autologous T-cells has been studied in 11 asthmatic and 11 healthy, nonatopic normal subjects. In the asthmatic group, AM accessory cell function was variable, and most subjects were unable to present either recall antigen as effectively as blood monocytes, although one asthmatic subject demonstrated larger proliferative responses than blood monocytes for both antigens. AM accessory cell activity was not antigen-specific, and there was a correlation between accessory cell efficacy for the two antigens (r = 0.92; confidence interval, 0.53 to 0.98). Furthermore, a correlation existed between the percentage lymphocyte count in the BAL fluid and the ratio of macrophage to monocyte antigen-presenting capability for both PPD (r = 0.92; 95% confidence interval, 0.83 to 0.99) and SKSD (r = 0.90; 95% confidence interval, 0.45 to 0.98). In the normal subjects, AM were also unable to act effectively as accessory cells for the presentation of PPD and SKSD in the majority of subjects. No correlation existed between the percentage lymphocytes in BAL fluid and the ratio of AM to monocyte accessory cell function. These results suggest an association between AM accessory function and the presence of BAL lymphocytes in bronchial asthma. PMID:1416417

  12. Review of accessory tragus with highlights of its associated syndromes.

    PubMed

    Bahrani, Bahar; Khachemoune, Amor

    2014-12-01

    Accessory tragus is a developmental defect involving malformation of part of the external ear. It is a moderately rare congenital condition reported in 1858 by Birkett for the first time. Histological features of accessory tragus include a thin layer of stratum corneum with a rugated epidermis, presence of eccrine glands, and irregular spatial positioning of vellus hair follicles accompanied by sebaceous glands. Accessory tragus is commonly a limited deformity; however, it can be a sign of associated congenital syndromes. It has been shown to be associated with Goldenhar syndrome, Townes-Brocks syndrome, Treacher-Collins syndrome, VACTERL syndrome, and Wolf-Hirschhron syndrome. Surgical excision, the most common form of management of accessory tragus lesions, typically leads to a positive outcome. An extensive search was performed using pubmed.gov, Embase, MedLine, and Googlescholar.com using key words: accessory tragus, congenital malformations of ear, first branchial arch, and embryology. In this paper, we review the clinical and histological presentation, associated syndromes, management, and outcome of accessory tragus. PMID:25266223

  13. Transvenous Catheter Ablation of a Posteroseptal Accessory Pathway in a Patient with Coexistent Posteroseptal and Right-Sided Accessory Pathways

    PubMed Central

    Ding-Jiu, Huang; Run-Fen, Chen; Dao-Sheng, Zheng; Ming-Xin, Huang; Morady, Fred

    1988-01-01

    Transvenous catheter ablation techniques have recently been used successfully in blocking posteroseptal accessory pathways in patients with Wolff-Parkinson-White syndrome (WPWS). We report the case of a patient in the People's Republic of China who had WPWS and posteroseptal and right anterolateral accessory pathways, and who had failed to respond to conventional antiarrhythmic drug therapy. The posteroseptal accessory pathway was ablated successfully. During 23 months of follow-up there were no complications; this led us to conclude that this technique can be used to achieve successful long-term ablation of this accessory pathway. This technique obviates the need for drug therapy and direct surgical ablation; it offers, as well, the advantages of shorter hospitalization, lower cost, a much shorter convalescence, and less discomfort to the patient. (Texas Heart Institute Journal 1988;15:61-64) PMID:15227283

  14. Minerals Yearbook

    NSDL National Science Digital Library

    According to the Minerals Yearbook Web site, the US Geological Survey Minerals Information Team's mission is to collect, analyze, and disseminate information on the domestic and international supply of and demand for minerals and mineral materials essential to the US economy and national security. The yearbook reviews the mineral and material industries of the United States and foreign countries, contains statistical data on materials and minerals, and includes information on economic and technical trends and development. Volume I contains metals and minerals information, volume II US area reports, and volume III international reports. A lot of data is presented in the various documents; thankfully, the site is organized well and easy to navigate.

  15. Ore Minerals

    NSDL National Science Digital Library

    Dexter Perkins

    This three part lab introduces sulfides and other ore minerals. Part one - Ore Minerals: Students fill in a table giving the metal, formula, and mineral group of several ore minerals. Part two - Box of Rocks: Students examine trays of ore minerals and record their physical properties, composition, habit, occurence, economic value, and use and answer questions about color, luster, density, transparency, and availability. Part three - Famous Digs: Students answer a series of questions related to famous ore deposits.

  16. Oscillatory-zoned crystals of pyrochlore-group minerals from the Guaniamo kimberlites, Venezuela

    NASA Astrophysics Data System (ADS)

    Sharygin, Victor V.; Sobolev, Nikolai V.; Channer, Dominic M. DeR.

    2009-11-01

    Oscillatory-zoned crystals of pyrochlore-group minerals are found in the La Ceniza diamondiferous kimberlites, Guaniamo region, Venezuela. This is the first known occurrence of the pyrochlore-group minerals in kimberlites worldwide. The minerals occur in the kimberlite groundmass in association with olivine, zoned spinel, phlogopite, carbonates (dolomite, calcite, magnesite), apatite, tetraferriphlogopite, Fe-Ni-Cu-sulfides and serpentine. They form discrete octahedral crystals or intergrowths (up to 50 ?m) with a red-brown core and light brown rim. Individual zones in the cores are remarkably enriched in TiO 2 (up to 14.3 wt.%), Ta 2O 5 (up to 10.1 wt.%), ZrO 2 (up to 23.7 wt.%), ThO 2 (up to 22.3 wt.%) and UO 2 (up to 8.0 wt.%) at moderate Nb 2O 5 contents, whereas the outer regions contain significant CaO (up to 17.5 wt.%), Na 2O (up to 5.7 wt.%), Nb 2O 5 (up to 58.9 wt.%) and F (up to 4.6 wt.%), approaching the ideal formula (Na,Ca) 2Nb 2O 6F. Following the IMA recommendations and the "50% rule", the interior is classified as uranoan Zr-rich thoriobetafite/thoriopyrochlore or thorian Zr-rich betafite/pyrochlore, and the outer part as pyrochlore or thorian pyrochlore. Strong compositional zoning is consistent with two substitutions: 2(Th,U) 4+ + ? + (Ti,Zr) 4+ + O 2- ? 3Ca 2+ + Nb 5+ + (F,OH) - and 2(Th,U) 4+ + ? + 2(Ti,Zr) 4+ + O 2- ? 2Ca 2+ + Na + + 2Nb 5+ + (F,OH) -. The zoning patterns and the absence of perovskite indicate the dominant role of F among fluid components and relatively high alkalinity during crystallization of the silicate-carbonate groundmass of the La Ceniza kimberlite. The composition and zoning of the La Ceniza pyrochlore-group minerals are very specific, but in general strongly resemble those of some pyrochlores from carbonatites.

  17. Tuft calcium spikes in accessory olfactory bulb mitral cells.

    PubMed

    Urban, Nathaniel N; Castro, Jason B

    2005-05-18

    The mammalian accessory olfactory system is critical for the detection and identification of pheromones and the representation of complex stimuli including sex, genetic relatedness, and individual identity. Mitral cells, the principal cells of the accessory olfactory bulb (AOB), receive monosynaptic input from the sensory periphery and already show highly specific response properties, firing selectively for combinations of genetic markers and gender-specific cues. Vomeronasal sensory neuron axons form synapses onto distal tuft-like branches of mitral cell primary dendrites. We have studied dendritic excitability and synaptic integration in AOB mitral cell dendrites, and we show that dendrites of accessory olfactory bulb mitral cells support action potential propagation and can fire regenerative spike-like events that are likely to contribute to the integration of inputs to these cells. These tuft spikes may be important for the specificity of AOB mitral cell responses. PMID:15901783

  18. Tuft Calcium Spikes in Accessory Olfactory Bulb Mitral Cells

    PubMed Central

    Urban, Nathaniel N.; Castro, Jason B.

    2005-01-01

    The mammalian accessory olfactory system is critical for the detection and identification of pheromones and the representation of complex stimuli including sex, genetic relatedness, and individual identity. Mitral cells, the principal cells of the accessory olfactory bulb (AOB), receive monosynaptic input from the sensory periphery and already show highly specific response properties, firing selectively for combinations of genetic markers and gender-specific cues. Vomeronasal sensory neuron axons form synapses onto distal tuft-like branches of mitral cell primary dendrites. We have studied dendritic excitability and synaptic integration in AOB mitral cell dendrites, and we show that dendrites of accessory olfactory bulb mitral cells support action potential propagation and can fire regenerative spike-like events that are likely to contribute to the integration of inputs to these cells. These tuft spikes may be important for the specificity of AOB mitral cell responses. PMID:15901783

  19. Mineral Classification

    NSDL National Science Digital Library

    This problem set challenges students to determine the chemical classification of minerals based on their chemical formula (provided). For oxygen-bearing minerals, students must also provide the valences of the various cations.

  20. Mineral Chart

    MedlinePLUS

    ... Dynamic Stretching A Guy's Guide to Body Image Mineral Chart KidsHealth > Teens > Miscellaneous > Mineral Chart Print A A A Text Size Type ... sources of calcium. You'll also find this mineral in broccoli and dark green, leafy vegetables. Soy ...

  1. Mineral Properties

    NSDL National Science Digital Library

    Mineralogy 4 Kids

    This site from the Mineralogical Society of America describes the physical properties of minerals in terms that kids will understand. The site also includes the definition of a mineral, an identification chart, and links to descriptions of the physical properties used to identify minerals.

  2. A giant serous cystadenoma developing in an accessory ovary

    Microsoft Academic Search

    Muhyittin Temiz; Ahmet Aslan; Arif Gungoren; Güvenç Diner; Sinem Karazincir

    2008-01-01

    Background  Accessory ovaries are rare anomalies and cysts arising from accessory ovaries are extremely rare. Their reported incidence\\u000a is 1\\/29,000–1\\/700,000. Establishing the diagnosis preoperatively is difficult. Radiologic methods are usually inadequate in\\u000a recognizing the origin of these tumors. Thus, they are usually confused with other intraabdominal tumors.\\u000a \\u000a \\u000a \\u000a Case  A 22-year-old nulliparous girl presented with abdominal pain and tumoral growth for 1.5 years. Abdominal

  3. Osteochondrosis of the accessory ossification centre of the medial malleolus.

    PubMed

    Farsetti, Pasquale; Dragoni, Massimiliano; Potenza, Vito; Caterini, Roberto

    2015-01-01

    We report a case of a painful accessory ossification centre of the medial malleolus in an 11-year-old girl who was not involved in sports activities. The patient was treated conservatively, with complete clinical and radiographic healing of the medial malleolus 6 months after the first presentation. We ruled out the uncommon pathological conditions causing chronic pain in the medial malleolus during skeletal growth, such as traction apophysitis of the medial malleolus, osteochondrosis, osteochondritis or avascular necrosis of the distal tibial epiphysis. We speculate that this painful condition may be classified as an osteochondrosis of the accessory ossification centre of the medial malleolus. PMID:25438106

  4. Chemocauterization of Congenital Fistula from the Accessory Parotid Gland

    PubMed Central

    Kim, Bong Jik; Sung, Myung-Whun; Kim, Kwang Hyun

    2008-01-01

    Congenital sialo-cutaneous fistula arising from the accessory parotid gland is extremely rare. Although the fistula tract can be successfully excised after making a skin incision along the skin tension line around the fistula opening, a facial scar inevitably remains. We here report a case of sialo-cutaneous fistula that was treated with chemocauterization with trichloroacetic acid (TCA). TCA cauterization is an easy and effective option for the treatment of congenital fistula from an accessory parotid gland, especially from the aesthetic point of view. PMID:19434283

  5. 6035 Hg(Ar) Lamp in 6058 Fiber Optic Accessory. Pencil Style Calibration Lamps

    E-print Network

    Woodall, Jerry M.

    6035 Hg(Ar) Lamp in 6058 Fiber Optic Accessory. Pencil Style Calibration Lamps Compact and simple, and spectral radiometers. We also offer a full range of accessories, from mounts and holders, to fiber optic

  6. 41 CFR 101-39.304 - Modification or installation of accessory equipment.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...GSA Interagency Fleet Management System Vehicles § 101-39...installation of accessory equipment. The modification of a GSA Interagency Fleet Management System (IFMS) vehicle...installation of accessory equipment on these...

  7. 41 CFR 101-39.304 - Modification or installation of accessory equipment.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...GSA Interagency Fleet Management System Vehicles § 101-39...installation of accessory equipment. The modification of a GSA Interagency Fleet Management System (IFMS) vehicle...installation of accessory equipment on these...

  8. 41 CFR 101-39.304 - Modification or installation of accessory equipment.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...GSA Interagency Fleet Management System Vehicles § 101-39...installation of accessory equipment. The modification of a GSA Interagency Fleet Management System (IFMS) vehicle...installation of accessory equipment on these...

  9. 41 CFR 101-39.304 - Modification or installation of accessory equipment.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...GSA Interagency Fleet Management System Vehicles § 101-39...installation of accessory equipment. The modification of a GSA Interagency Fleet Management System (IFMS) vehicle...installation of accessory equipment on these...

  10. 41 CFR 101-39.304 - Modification or installation of accessory equipment.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...GSA Interagency Fleet Management System Vehicles § 101-39...installation of accessory equipment. The modification of a GSA Interagency Fleet Management System (IFMS) vehicle...installation of accessory equipment on these...

  11. 21 CFR 884.6190 - Assisted reproductive microscopes and microscope accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...which are classified under assisted reproduction accessories) are optical instruments used to enlarge images of gametes or embryos. Variations of microscopes and accessories used for these purposes would include phase contrast microscopes, dissecting...

  12. 21 CFR 884.6190 - Assisted reproductive microscopes and microscope accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...which are classified under assisted reproduction accessories) are optical instruments used to enlarge images of gametes or embryos. Variations of microscopes and accessories used for these purposes would include phase contrast microscopes, dissecting...

  13. 21 CFR 884.6190 - Assisted reproductive microscopes and microscope accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...which are classified under assisted reproduction accessories) are optical instruments used to enlarge images of gametes or embryos. Variations of microscopes and accessories used for these purposes would include phase contrast microscopes, dissecting...

  14. 21 CFR 884.4150 - Bipolar endoscopic coagulator-cutter and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Bipolar endoscopic coagulator-cutter and accessories...Gynecological Surgical Devices § 884.4150 Bipolar endoscopic coagulator-cutter and accessories. (a) Identification. A bipolar endoscopic...

  15. 21 CFR 884.4150 - Bipolar endoscopic coagulator-cutter and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Bipolar endoscopic coagulator-cutter and accessories...Gynecological Surgical Devices § 884.4150 Bipolar endoscopic coagulator-cutter and accessories. (a) Identification. A bipolar endoscopic...

  16. 77 FR 67261 - Airworthiness Directives; Aeronautical Accessories, Inc., High Landing Gear Forward Crosstube...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-09

    ...Directives; Aeronautical Accessories, Inc., High Landing Gear Forward Crosstube...directive (AD) for Aeronautical Accessories, Inc. (AAI) high landing gear forward crosstube...AB412EP; and Bell Helicopter Textron, Inc. (Bell) Model 205A, 205A-1,...

  17. 77 FR 37768 - Airworthiness Directives; Aeronautical Accessories, Inc., High Landing Gear Aft Crosstube Assembly

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-25

    ...Directives; Aeronautical Accessories, Inc., High Landing Gear Aft Crosstube Assembly...AD) for the Aeronautical Accessories, Inc. (AAI), High Landing Gear Aft Crosstube...installed on certain Bell Helicopter Textron, Inc. (Bell) and Agusta S.p.A....

  18. Liouville theory, {N} = 2 gauge theories and accessory parameters

    NASA Astrophysics Data System (ADS)

    Ferrari, Franco; Piatek, Marcin

    2012-05-01

    The correspondence between the semiclassical limit of the DOZZ quantum Liouville theory and the Nekrasov-Shatashvili limit of the {N} = 2 (?-deformed) U(2) super-Yang-Mills theories is used to calculate the unknown accessory parameter of the Fuchsian uniformization of the 4-punctured sphere. The computation is based on the saddle point method. This allows to find an analytic expression for the N f = 4, U(2) instanton twisted superpotential and, in turn, to sum up the 4-point classical block. It is well known that the critical value of the Liouville action functional is the generating function of the accessory parameters. This statement and the factorization property of the 4-point action allow to express the unknown accessory parameter as the derivative of the 4-point classical block with respect to the modular parameter of the 4-punctured sphere. It has been found that this accessory parameter is related to the sum of all rescaled column lengths of the so-called 'critical' Young diagram extremizing the instanton 'free energy'. It is shown that the sum over the 'critical' column lengths can be rewritten in terms of a contour integral in which the integrand is built out of certain special functions closely related to the ordinary Gamma function.

  19. The accessory middle cerebral artery (AMCA). Diagnostic and therapeutic consequences

    Microsoft Academic Search

    A. Abanou; P. Lasjaunias; C. Manelfe; L. Lopez-Ibor

    1984-01-01

    Summary The existence of the accessory middle cerebral artery (AMCA) is a rare anatomical variation with an estimated incidence of 0.31%. The embryological development of this artery is unknown. Three anatomical subtypes are described: in the type 1 variety the AMCA arises from the internal carotid artery; in the type 2, the AMCA originates from the proximal part of the

  20. 21 CFR 872.6010 - Abrasive device and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Abrasive device and accessories. 872...SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous...in § 872.9. If the device is not labeled or otherwise...of the quality system regulation in part 820 of this...

  1. 21 CFR 872.4120 - Bone cutting instrument and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...Identification. A bone cutting instrument and accessories is a metal device intended for use in reconstructive oral surgery to drill or cut into the upper or lower jaw and may be used to prepare bone to insert a wire, pin, or screw....

  2. 21 CFR 872.4120 - Bone cutting instrument and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...Identification. A bone cutting instrument and accessories is a metal device intended for use in reconstructive oral surgery to drill or cut into the upper or lower jaw and may be used to prepare bone to insert a wire, pin, or screw....

  3. 21 CFR 872.4120 - Bone cutting instrument and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...Identification. A bone cutting instrument and accessories is a metal device intended for use in reconstructive oral surgery to drill or cut into the upper or lower jaw and may be used to prepare bone to insert a wire, pin, or screw....

  4. Conservative management of accessory spleen torsion in children.

    PubMed

    Scirè, G; Zampieri, N; El-Dalati, G; Camoglio, F S

    2013-08-01

    Accessory spleen torsion is very rare condition especially in children. The aim of this study is to report the conservative treatment option. In April 2009 we observed a 10-year-old child affected by hereditary spherocytosis who reported acute abdominal pain without fever or vomiting. At hospitalization all blood tests were within normal value. Abdominal ultrasounds showed an increase in spleen volume and a solid round-shaped hypoechogenic formation with hyperechogenic areas in the lower pole without vascolarisation on color-Doppler scan. These findings suggested torsion of the accessory spleen. We opted for a conservative approach: analgesics on demand and antibiotics. After a week symptoms resolved spontaneously and patient was discharged in good health conditions. Follow-up ultrasound scans were performed at one week, three-six months and one year after hospitalization and showed a progressive reduction of the dimensions of the solid round-shaped formation. Accessory spleen torsion needs to be added to the differential diagnosis of cases of acute abdomen in children. Ultrasounds with eco-color-Doppler scans seem to be the best option for the diagnosis of such condition in the pediatric age since other diagnostic methods are more invasive and require sedation of patients. Once accessory spleen torsion is correctly diagnosed it is possible to opt for its conservative treatment. PMID:24051978

  5. Evolutionary Dynamics of the Accessory Genome of Listeria monocytogenes

    PubMed Central

    den Bakker, Henk C.; Desjardins, Christopher A.; Griggs, Allison D.; Peters, Joseph E.; Zeng, Qiandong; Young, Sarah K.; Kodira, Chinnappa D.; Yandava, Chandri; Hepburn, Theresa A.; Haas, Brian J.; Birren, Bruce W.; Wiedmann, Martin

    2013-01-01

    Listeria monocytogenes, a foodborne bacterial pathogen, is comprised of four phylogenetic lineages that vary with regard to their serotypes and distribution among sources. In order to characterize lineage-specific genomic diversity within L. monocytogenes, we sequenced the genomes of eight strains from several lineages and serotypes, and characterized the accessory genome, which was hypothesized to contribute to phenotypic differences across lineages. The eight L. monocytogenes genomes sequenced range in size from 2.85–3.14 Mb, encode 2,822–3,187 genes, and include the first publicly available sequenced representatives of serotypes 1/2c, 3a and 4c. Mapping of the distribution of accessory genes revealed two distinct regions of the L. monocytogenes chromosome: an accessory-rich region in the first 65° adjacent to the origin of replication and a more stable region in the remaining 295°. This pattern of genome organization is distinct from that of related bacteria Staphylococcus aureus and Bacillus cereus. The accessory genome of all lineages is enriched for cell surface-related genes and phosphotransferase systems, and transcriptional regulators, highlighting the selective pressures faced by contemporary strains from their hosts, other microbes, and their environment. Phylogenetic analysis of O-antigen genes and gene clusters predicts that serotype 4 was ancestral in L. monocytogenes and serotype 1/2 associated gene clusters were putatively introduced through horizontal gene transfer in the ancestral population of L. monocytogenes lineage I and II. PMID:23825666

  6. 49 CFR 192.147 - Flanges and flange accessories.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...a) Each flange or flange accessory (other than cast iron) must meet the minimum requirements of ASME/ANSI B16.5, MSS SP-44, or the equivalent. (b) Each flange assembly must be able to withstand the maximum pressure at which the...

  7. Oncocytic carcinoma of the accessory lobe of the parotid gland.

    PubMed

    Colella, Giuseppe; Apicella, Adolfo; Bove, Pierfrancesco; Rossiello, Luigi; Trodella, Michele; Rossiello, Raffaele

    2010-11-01

    Oncocytic carcinoma is a rare tumor of the parotid gland. An additional case, characterized by an exceptional localization in the accessory lobe of the parotid gland, never reported to date in the literature, is described. The clinical and histologic difficulties in relationship to the diagnosis of a midcheek mass consisting of an unusual tumor are emphasized. PMID:21119478

  8. Mesangial cell accessory functions: Mediation by intercellular adhesion molecule-1

    Microsoft Academic Search

    Daniel C Brennan; Anthony M Jevnikar; Fumio Takei; Vicki E Reubin-Kelley

    1990-01-01

    Mesangial cell accessory functions: Mediation by intercellular adhesion molecule-1. Mesangial cell (MC) proliferation is an early pathologic alteration characteristic of many forms of immune mediated glomerulonephritis. The intracapillary position, contractile capacity, and production of cytokines and other inflammatory molecules place MC in a pivotal position to initiate, mediate, and direct glomerular damage. We as well as others have noted increased

  9. Ductal Cysts of the Accessory Lacrimal Glands: CT Findings

    Microsoft Academic Search

    Nabil J. Khoury; Maurice C. Haddad; Ayman N. Tawil; Riad N. Ma' luf

    Summary: Benign ductal cysts of the accessory lacrimal glands are uncommon lesions of the orbit, arising from the glands of Wolfring and Krause. We report two patients with histopathologically proved cysts in whom CT scans revealed well-circumscribed extraconal cystic lesions ad- jacent to the globe, involving both eyelids. Radiologists should be aware of these rare lesions so as to include

  10. Determination of radon concentration in water using RAD7 with RAD H2O accessories

    NASA Astrophysics Data System (ADS)

    Malik, M. F. I.; Rabaiee, N. A.; Jaafar, M. S.

    2015-04-01

    In the last decade, the radon issue has become one of the major problems of radiation protection. Radon exposure occurs when using water for showering, washing dishes, cooking and drinking water. RAD7 and Rad H20 accessories were used in order to measure radon concentration in water sample. In this study, four types of water were concerns which are reverse osmosis (drinking water), mineral water, tap water and well water. Reverse osmosis (drinking water) and mineral water were bought from the nearest supermarket while tap water and well water were taken from selected areas of Pulau Pinang and Kedah. Total 20 samples were taken with 5 samples for each type of water. The measured radon concentration ranged from 2.9±2.9 to 79.5±17 pCi/L, 2.9±2.9 to 67.8±16 pCi/L, 15.97±7 to 144.25±24 pCi/L and 374.89±37 to 6409.03±130 pCi/L in reverse osmosis (drinking water), mineral water, tap water and well water. Well water has the highest radon compared to others. It was due to their geological element such as granite. Results for all types of water are presented and compared with maximum contamination limit (MCL) recommended by United State Environmental Protection Agency (USEPA) which is 300pCi/L. Reverse osmosis water, mineral water and tap water were fall below MCL. However, well water was exceeded maximum level that was recommended. Thus, these findings were suggested that an action should be taken to reduce radon concentration level in well water as well as reduce a health risk towards the public.

  11. Zirkelite from the Sebl'yavr carbonatite complex, Kola Peninsula, Russia:an X-ray and electron microprobe study of a partiaUy metamict mineral

    Microsoft Academic Search

    A. G. BULAKH; A. R. NESTEROV; C. T. WILLlAMS; I. S. ANISIMOV

    Zirke)ite, a cubic mineral of general formula (Ti,Ca,Zr)02.x. occurs as an accessory mineral in phoscorites, carbonatites and associated rocks in the Sebl'yavr complex. After pyrochlore, it is the main mineral concentrating niobium in these rocks. Zirkclite forms platy crystals comprising polysynthetic octahedral twins, often having a complex skeletal internal structure within a cuboctahedral external morphology. The mineral is largely metamict,

  12. Mineral Identification

    NSDL National Science Digital Library

    John Pratte

    This lesson discusses the question 'What is a mineral?' in the context of the guessing game 'Animal, Vegetable, or Mineral?'. It introduces a definition of the term, discusses the criteria used in the definition, and presents the common physical properties used in mineral identification. The lesson includes an activity in which students observe and record the physical properties of ten specimens and attempt to identify them using an online reference for practice.

  13. Mineral Densities

    NSDL National Science Digital Library

    Students are given cubic cell edge dimensions and asked to calculate mineral densities and vice versa. The final question of this homework assignment provides students with a mineral density and unit cell edge length in order to determine the number of formula units per cell.

  14. Mineral Identification

    NSDL National Science Digital Library

    Michael Passow

    In this activity, students use written and online materials to answer a set of questions on the general properties and identification of minerals. They will learn about physical properties such as color, hardness, and cleavage; special properties such as fluorescence and effervescence; and complete a chart listing properties for a selection of minerals. Links to the necessary information are provided.

  15. Industrial Minerals.

    ERIC Educational Resources Information Center

    Brady, Lawrence L.

    1983-01-01

    Discusses trends in and factors related to the production of industrial minerals during 1982, indicating that, as 1981 marked a downturn in production of industrial minerals, 1982 continued the trend with temporary and permanent cutbacks in mine and plant production. Includes highlights of several conferences/conference papers in this field.…

  16. Mineral Hunt

    NSDL National Science Digital Library

    2012-06-26

    In this activity, learners search for various kinds of items made from minerals around their home or school, including toothpaste, wall paint, kitty litter, and bricks. The PDF contains a check off list as well as recommended sites for more information on minerals.

  17. Mystery Minerals

    NSDL National Science Digital Library

    Susan Morgan

    In this activity, students will discover that minerals have specific characteristics that help to identify them. They will learn that minerals are formed by inorganic processes, are crystalline solids with an internal orderly arrangement of atoms, have specific chemical compositions, and have specific physical and chemical characteristics. They will also learn that minerals are commonly identified by the physical properties they possess, such as hardness, color, crystal shape, specific gravity, and streak. In addition, they will discover some other useful properties such as reaction with hydrochloric acid or a characteristic taste. They should also understand that color is not always a useful property for identifying minerals because it can vary. The students will also develop listening and observational skills and learn the uses of a few common minerals.

  18. Perioperative Identification of an Accessory Fissure of the Right Lung

    PubMed Central

    Taverne, Yannick; Kleinrensink, Gert-Jan; de Rooij, Peter

    2015-01-01

    Anatomical variations of lungs are common in clinical practice; however, they are sometimes overlooked in routine imaging. Surgical anatomy of the lung is complex and many variations are known to occur. A defective pulmonary development gives rise to variations in lobes and fissures. Morphological presentation is of clinical importance and profound knowledge of the organogenesis and functional anatomy is imperative for the interpretation and evaluation of lung pathophysiology and subsequent surgical intervention. However, appreciating them on radiographs and CT scans is difficult and they are therefore often either not identified or completely misinterpreted. As presented in this case report, an accessory fissure separating the superior segment of the right lower lobe from its native lobe was seen perioperatively and could only retrospectively be defined on X-rays and CT scan. It is imperative to keep in mind that accessory fissures can be missed on imaging studies and thus can make the surgical procedure more challenging. PMID:26185701

  19. Spinal accessory nerve schwannomas masquerading as a fourth ventricular lesion

    PubMed Central

    Krishnan, Shyam Sundar; Bojja, Sivaram; Vasudevan, Madabhushi Chakravarthy

    2015-01-01

    Schwannomas are benign lesions that arise from the nerve sheath of cranial nerves. The most common schwannomas arise from the 8th cranial nerve (the vestibulo-cochlear nerve) followed by trigeminal and facial nerves and then from glossopharyngeal, vagus, and spinal accessory nerves. Schwannomas involving the oculomotor, trochlear, abducens and hypoglossal nerves are very rare. We report a very unusual spinal accessory nerve schwannoma which occupied the fourth ventricle and extended inferiorly to the upper cervical canal. The radiological features have been detailed. The diagnostic dilemma was due to its midline posterior location mimicking a fourth ventricular lesion like medulloblastoma and ependymoma. Total excision is the ideal treatment for these tumors. A brief review of literature with tabulations of the variants has been listed. PMID:25552867

  20. Female accessory glands and sperm reception in Tingidae (Heteroptera)

    Microsoft Academic Search

    David Livingstone; M H S Yacoob

    1990-01-01

    Studies on the anatomy of the female internal organs of reproduction and the intromittent organs of 34 species of Tingidae\\u000a confirm the absence of spermathecae. The accessory glands are vesicular and primitively unpaired. There is no vermiform gland\\u000a and the term pseudosperrnatheca, introduced by Carayon in heteropteran literature, is a misnomer. The lateral oviduct and\\u000a all the 7 pedicels of

  1. The consistent presence of the human accessory deep peroneal nerve.

    PubMed

    Kudoh, H; Sakai, T; Horiguchi, M

    1999-01-01

    Twenty-four human legs were dissected macroscopically to study the morphological details of the accessory deep peroneal nerve. This nerve arose from the superficial peroneal nerve and descended in the lateral compartment of the leg, deep to peroneus longus along the posterior border of peroneus brevis. Approaching the ankle joint, this nerve passed through the peroneal tunnels to wind around the lateral malleolus; it then crossed beneath the peroneus brevis tendon anteriorly to reach the dorsum of the foot. The accessory deep peroneal nerve was found in every case examined and constantly gave off muscular branches to peroneus brevis and sensory branches to the ankle region. In addition, this nerve occasionally had muscular branches to peroneus longus and extensor digitorum brevis, and sensory branches to the fibula and the foot. The anomalous muscles around the lateral malleolus were also innervated by this nerve. Neither cutaneous branches nor communicating branches with other nerves were found. The present study reveals that the accessory deep peroneal nerve is consistently present and possesses a proper motor and sensory distribution in the lateral region of the leg and ankle. It is not an anomalous nerve as has previously been suggested. PMID:10227671

  2. Melanocortin receptor accessory proteins in adrenal disease and obesity

    PubMed Central

    Jackson, David S.; Ramachandrappa, Shwetha; Clark, Adrian J.; Chan, Li F.

    2015-01-01

    Melanocortin receptor accessory proteins (MRAPs) are regulators of the melanocortin receptor family. MRAP is an essential accessory factor for the functional expression of the MC2R/ACTH receptor. The importance of MRAP in adrenal gland physiology is demonstrated by the clinical condition familial glucocorticoid deficiency type 2. The role of its paralog melanocortin-2-receptor accessory protein 2 (MRAP2), which is predominantly expressed in the hypothalamus including the paraventricular nucleus, has recently been linked to mammalian obesity. Whole body deletion and targeted brain specific deletion of the Mrap2 gene result in severe obesity in mice. Interestingly, Mrap2 complete knockout (KO) mice have increased body weight without detectable changes to food intake or energy expenditure. Rare heterozygous variants of MRAP2 have been found in humans with severe, early-onset obesity. In vitro data have shown that Mrap2 interaction with the melanocortin-4-receptor (Mc4r) affects receptor signaling. However, the mechanism by which Mrap2 regulates body weight in vivo is not fully understood and differences between the phenotypes of Mrap2 and Mc4r KO mice may point toward Mc4r independent mechanisms.

  3. An Accessory Agonist Binding Site Promotes Activation of ?4?2* Nicotinic Acetylcholine Receptors.

    PubMed

    Wang, Jingyi; Kuryatov, Alexander; Sriram, Aarati; Jin, Zhuang; Kamenecka, Theodore M; Kenny, Paul J; Lindstrom, Jon

    2015-05-29

    Neuronal nicotinic acetylcholine receptors containing ?4, ?2, and sometimes other subunits (?4?2* nAChRs) regulate addictive and other behavioral effects of nicotine. These nAChRs exist in several stoichiometries, typically with two high affinity acetylcholine (ACh) binding sites at the interface of ?4 and ?2 subunits and a fifth accessory subunit. A third low affinity ACh binding site is formed when this accessory subunit is ?4 but not if it is ?2. Agonists selective for the accessory ACh site, such as 3-[3-(3-pyridyl)-1,2,4-oxadiazol-5-yl]benzonitrile (NS9283), cannot alone activate a nAChR but can facilitate more efficient activation in combination with agonists at the canonical ?4?2 sites. We therefore suggest categorizing agonists according to their site selectivity. NS9283 binds to the accessory ACh binding site; thus it is termed an accessory site-selective agonist. We expressed (?4?2)2 concatamers in Xenopus oocytes with free accessory subunits to obtain defined nAChR stoichiometries and ?4/accessory subunit interfaces. We show that ?2, ?3, ?4, and ?6 accessory subunits can form binding sites for ACh and NS9283 at interfaces with ?4 subunits, but ?2 and ?4 accessory subunits cannot. To permit selective blockage of the accessory site, ?4 threonine 126 located on the minus side of ?4 that contributes to the accessory site, but not the ?4?2 sites, was mutated to cysteine. Alkylation of this cysteine with a thioreactive reagent blocked activity of ACh and NS9283 at the accessory site. Accessory agonist binding sites are promising drug targets. PMID:25869137

  4. INDEX TO VOLUME 195 accessory minerals, lithologic units, A3:13

    E-print Network

    . titanium oxide, B4:23, 27 ammonium, vs. depth, A3:115; A4:132 amphibole harzburgite, A3:17 lithologic units, B8:17 vs. titanium, B8:17 aluminum oxide metamorphic clasts, B4:8 serpentinite, A3:20 serpentinized peridotite compared with serpentine mud, B4:6­7 vs. barium/ytterbium ratio, B4:35 vs. calcium oxide, A1:44; A

  5. Age and evolution of the Grenville Province in eastern Labrador from UPb systematics in accessory minerals

    Microsoft Academic Search

    U. Schärer; T. E. Krogh; C. F. Gower

    1986-01-01

    U-Pb isotope analysis of zircon, titanite, monazite and rutile extracted from 15 different Grenville Province rocks in eastern Labrador reveals: 1) major crust formation through magmatism between 1,710 and 1,630 Ma ago; no evidence of older crustal material was found. 2) Pegmatite and gabbro intrusions between 1,500 and 1,400 Ma ago, probably related to incomplete rifting of the earlier formed

  6. 21 CFR 876.4730 - Manual gastroenterology-urology surgical instrument and accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... false Manual gastroenterology-urology surgical instrument and accessories...MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4730 Manual gastroenterology-urology surgical instrument and...

  7. 21 CFR 876.4730 - Manual gastroenterology-urology surgical instrument and accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... false Manual gastroenterology-urology surgical instrument and accessories...MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4730 Manual gastroenterology-urology surgical instrument and...

  8. 21 CFR 876.4730 - Manual gastroenterology-urology surgical instrument and accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... false Manual gastroenterology-urology surgical instrument and accessories...MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4730 Manual gastroenterology-urology surgical instrument and...

  9. 21 CFR 876.4730 - Manual gastroenterology-urology surgical instrument and accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... false Manual gastroenterology-urology surgical instrument and accessories...MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4730 Manual gastroenterology-urology surgical instrument and...

  10. 21 CFR 876.4730 - Manual gastroenterology-urology surgical instrument and accessories.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... false Manual gastroenterology-urology surgical instrument and accessories...MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Surgical Devices § 876.4730 Manual gastroenterology-urology surgical instrument and...

  11. Thermomechanical milling of accessory lithics in volcanic conduits

    NASA Astrophysics Data System (ADS)

    Campbell, Michelle E.; Russell, James K.; Porritt, Lucy A.

    2013-09-01

    Accessory lithic clasts recovered from pyroclastic deposits commonly result from the failure of conduit wall rocks, and represent an underutilized resource for constraining conduit processes during explosive volcanic eruptions. The morphological features of lithic clasts provide distinctive 'textural fingerprints' of processes that have reshaped them during transport in the conduit. Here, we present the first study focused on accessory lithic clast morphology and show how the shapes and surfaces of these accessory pyroclasts can inform on conduit processes. We use two main types of accessory lithic clasts from pyroclastic fallout deposits of the 2360 B.P. subplinian eruption of Mount Meager, British Columbia, as a case study: (i) rough and subangular dacite clasts, and (ii) variably rounded and smoothed monzogranite clasts. The quantitative morphological data collected on these lithics include: mass, volume, density, 2-D image analysis of convexity (C), and 3-D laser scans for sphericity (?) and smoothness (S). Shaping and comminution (i.e. milling) of clasts within the conduit are ascribed to three processes: (1) disruptive fragmentation due to high-energy impacts between clasts or between clasts and conduit walls, (2) ash-blasting of clasts suspended within the volcanic flux, and (3) thermal effects. We use a simplified conduit eruption model to predict ash-blasting velocities and lithic residence times as a function of clast size and source depth, thereby constraining the lithic milling processes. The extent of shape and surface modification (i.e. rounding and honing) is directly proportional to clast residence times within the conduit prior to evacuation. We postulate that the shallow-seated dacite clasts remain subangular and rough due to short (<2 min) residence times, whereas monzogranite clasts are much more rounded and smoothed due to deeper source depths and consequently longer residence times (up to ˜1 h). Larger monzogranite clasts are smoother than smaller clasts due to longer residence times and to greater differential velocities within the ash-laden jet. Lastly, our model residence times and mass loss estimates for rounded clasts are used to estimate minimum attrition rates due to volcanic ash-blasting within the conduit (e.g., 12 cm3?s-1 for 25 cm clasts, sourced at 2500 m depth).

  12. Sc and REE-bearing ixiolite and associated minerals from the Sosedka pegmatite vein in the Malkhan pegmatite field, central Transbaikal region

    Microsoft Academic Search

    E. V. Badanina; V. V. Gordienko; A. Wiechowski; G. Friedrich

    2008-01-01

    Composition and localization of REE mineralization in miarolitic pegmatites and its role in the pegmatite formation were studied\\u000a at the Malkhan gem deposit (jewel-quality tourmaline, morganite, danburite, and hambergite) in the central Transbaikal region.\\u000a The chemical composition of Ti-, Ta-, Nb- and REE-bearing minerals, their relationships with rock-forming and accessory minerals\\u000a indicate that two geochemically specialized stages of pegmatite formation

  13. U, Th, Pb and REE abundances and Pb 207/Pb 206 ages of individual minerals in returned lunar material by ion microprobe mass analysis.

    NASA Technical Reports Server (NTRS)

    Andersen, C. A.; Hinthorne, J. R.

    1972-01-01

    Results of ion microprobe analyses of Apollo 11, 12 and 14 material, showing that U, Th, Pb and REE are concentrated in accessory minerals such as apatite, whitlockite, zircon, baddeleyite, zirkelite, and tranquillityite. Th/U ratios are found to vary by over a factor of 40 in these minerals. K, Ba, Rb and Sr have been localized in a K rich, U and Th poor glass phase that is commonly associated with the U and Th bearing accessory minerals. Li is observed to be fairly evenly distributed between the various accessory phases. The phosphates have been found to have REE abundance patterns (normalized to the chondrite abundances) that are fairly flat, while the Zr bearing minerals have patterns that rise steeply, by factors of ten or more, from La to Gd. All the accessory minerals have large negative Eu anomalies. Radiometric age dates (Pb 207/Pb 206) of the individual U and Th bearing minerals compare favorably with the Pb 207/Pb 206 age of the bulk rocks.

  14. Accessory spleen in the pelvis: A case report

    PubMed Central

    Taskin, Mine Islimye; Baser, Banu Guleç; Adali, Ertan; Bulbul, Erdo?an; Uzgoren, Engin

    2015-01-01

    Introduction Accessory Spleen (AS) is a very rare entity and usually near the spleen’s hilum and in the tail of the pancreas. Pelvis reported as an atypical and a rare localization. AS may be formed during embryonic life, they rise from the left side of the dorsal mesogastrium as a result of imperfect fusion of separate splenic masses. Presentation of case We report a case of an AS presenting as an left adnexal mass in a middle-aged woman. Transvaginal ultrasonography and magnetic resonance imaging (MRI) revealed a left adnexial mass. Laparatomy was performed, and histological examination revealed that resected mass was splenic tissue. Discussion An AS is an incidental finding of no clinical significance in most patients. AS are generally determined during radiological investigations or during open or laparoscopic surgeries. When, the AS settle in the adnexal area; the differential diagnosis could include the causes of adnexal masses like enlarged lymph nodes, subserous fibroid, ovarian tumors, organized hematoma, tuboovarian abscess. Conclusion Althought pelvic accessory spleen is a rare condition, should be considered in the differential diagnosis of adnexal masses. PMID:25985297

  15. Efferents and Centrifugal Afferents of the Main and Accessory Olfactory Bulbs in the Snake Thamnophis sirtalis

    Microsoft Academic Search

    Enrique Lanuza; Mimi Halpern

    1998-01-01

    This study reinvestigates the efferent projections of the main and accessory olfactory bulbs and describes for the first time the centrifugal projections to the main and accessory olfactory bulbs in the snake Thamnophis sirtalis, using the intraaxonal transport of the anterograde and retrograde tracer biotinylated dextran amine and the retrograde tracer horseradish peroxidase. The olfactory projection consists of three tracts:

  16. Vitamins and Minerals

    MedlinePLUS

    ... of a good thing? What Are Vitamins and Minerals? Vitamins and minerals make people's bodies work properly. ... of them each day. What Do Vitamins and Minerals Do? Vitamins and minerals boost the immune system, ...

  17. Vitamins and Minerals

    MedlinePLUS

    ... Select a Language: Fact Sheet 801 Vitamins and Minerals WHY ARE VITAMINS AND MINERALS IMPORTANT? WHAT ARE ANTIOXIDANTS? HOW MUCH DO I ... HARMFUL? FOR MORE INFORMATION WHY ARE VITAMINS AND MINERALS IMPORTANT? Vitamins and minerals are sometimes called micronutrients. ...

  18. Successful catheter ablation of a left anterior accessory pathway from the non-coronary cusp of the aortic valve.

    PubMed

    Laranjo, Sérgio; Oliveira, Mário; Trigo, Conceição

    2015-08-01

    Left anterior accessory pathways are considered to be rare findings. Catheter ablation of accessory pathways in this location remains a challenging target, and few reports about successful ablation of these accessory pathways are available. We describe our experience regarding a case of a manifest left anterior accessory pathway ablation using radiofrequency energy at the junction of the left coronary cusp with the non-coronary cusp. PMID:25249369

  19. Safety and efficacy of a modified catheter-mediated ablation of accessory pathways.

    PubMed

    Chen, S A; Tsang, W P; Wang, D C; Hsia, C P; Chen, J W; Chiang, C E; Ting, C T; Wang, S P; Chiang, B N; Chang, M S

    1992-05-01

    Fifty-one consecutive patients underwent modified catheter-mediated direct-current ablation of accessory pathways. Energy was delivered through the distal pair of electrodes (dual electrode configuration) of a 6F quadripolar catheter to the internal surface of the right or left atrioventricular (AV) annulus. In an attempt to prevent the later resumption of accessory pathway conduction, one additional shock was given after the initial successful interruption of accessory pathways. A mean of 2.7 shocks with cumulative energy of 453 +/- 32 Joules/patient interrupted the accessory pathways in 47 patients and modified the accessory pathway conduction in 2 patients. Forty-eight patients were asymptomatic and free of any antiarrhythmic agents with a follow-up ranging from 3-20 months (mean 12 +/- 1 months), without early or late serious complications (AV block or tamponade). Conduction characteristics, concealed or manifest, and recording of accessory pathway activity did not affect the outcome. Mean cumulative energy and number of applications of energy to achieve a successful outcome were lower in patients with concealed (376 +/- 31 Joules, 2.4 +/- 0.2 shocks) than manifest accessory pathways (516 +/- 50 Joules, 2.9 +/- 0.2 shocks). At the successful ablation sites, the mean shortest retrograde ventriculoatrial interval during orthodromic reentrant tachycardia (VA') was 80 +/- 3 msec (78% had VA' less than 90 msec) and was not different between concealed and manifest accessory pathways; the mean shortest antegrade AV interval was 47 +/- 3 msec in manifest preexcitation; the mean ratio of atrial to ventricular wave amplitude was not significantly different between left-sided (0.8 +/- 0.1) and right-sided (1.1 +/- 0.2) accessory pathways (p greater than 0.05). A successful outcome was achieved in 94% of 51 patients. This procedure is relatively safe and effective, regardless of the location of the accessory pathway. PMID:1522687

  20. Mineral Commodities

    NSDL National Science Digital Library

    Dexter Perkins

    This exercise introduces mineral commodities (elements). Students consider the elements aluminum, iron, copper, nickel, zinc, uranium, lead, gold, mercury and tin and match them with their definintions in a table. Then they use minable grade (minable weight percent) and normal crustal abundance (crustal weight percent) to calculate the concentration factor for several commodities to determine their economic minability. Students then graph their calculations and explain their trend.

  1. Rocks and Minerals

    NSDL National Science Digital Library

    richrigby

    2010-02-23

    Rock Cycle Mineralogy 4 Kids Mineralogy 4 kids : rockin Internet site : the best place to learn about rocks and minerals Rock Cycle Map Rocks and Minerals Rocks and Minerals Pictures Rocks and Minerals Slide Show Rocks and Minerals Slide Show Earth Science Earth Science Uses for Minerals Metamorphic Rock Forming Sedimentary Rocks Observation ...

  2. Morphology and protein patterns of honey bee drone accessory glands.

    PubMed

    Cruz-Landim, Carminda da; Dallacqua, Rodrigo Pires

    2005-01-01

    We used light and transmission electron microscopy to examine the morphology of the accessory glands of immature and mature adult males of Apis mellifera L. We also made an electrophoretic analysis of the protein content of the mature gland. The glands of the immature male actively secrete a mucous substance that can be seen in the lumen of the gland of the mature male. This secretion stains with mercury bromophenol blue and with periodic acid-Schiff reaction, which stain glyconjugates. The protein content was higher in the lumen secretion than in the gland wall extracts. The electrophoresis patterns of the wall extracts were different from those of the secretion found in the gland lumen. PMID:16342031

  3. Twin pregnancy in an accessory cavitated non-communicating uterus

    PubMed Central

    Alkhateeb, Harith M.; Yaseen, Enas M.

    2015-01-01

    Background A uterine malformation is a type of female genital malformation resulting from abnormal development of the Mullerian duct(s) during embryogenesis. The type and degree of uterine malformation depends on the level at which the fusion process of the two Mullerian ducts stops; thus, there is a wide variety of malformations. A newly described deformity called accessory cavitated uterine mass (ACUM) has been increasingly reported. The case We report this deformity (in a 20-year-old married woman) which appears to be an additional incompletely developed, cavitated and presumably non-communicating uterus in addition to a normally shaped and developed uterus. The former uterus became impregnated with twins that died in a missed abortion at 13 weeks of gestation. Before discovering the presence of the deformity, three attempts were made to evacuate the dead fetuses by cervical dilatation and curettage of the normal empty uterus. These attempts resulted in perforation of its fundus, a laparotomy was performed to repair the uterus. During the laparotomy, the pregnant accessory uterus was discovered and was excised with the dead twins. Discussion The lack of good medical history was a cause of the mismanagement of this patient. Most probably, the origin of ACUM is a growth from the right Mullerian duct. The ovum has entered the ACUM through the rudimentary tube and has been fertilized by a sperm travelled either through the normal vaginal and uterine cavities or through the lymphatics. Conclusions (1) A detailed case history is important. (2) An ACUM can be impregnated. PMID:25813124

  4. Carbon and nitrogen mineralization are decoupled in organo-mineral fractions

    NASA Astrophysics Data System (ADS)

    Bimüller, Carolin; Mueller, Carsten W.; von Lützow, Margit; Kreyling, Olivia; Kölbl, Angelika; Haug, Stephan; Schloter, Michael; Kögel-Knabner, Ingrid

    2015-04-01

    To improve our comprehension how carbon and nitrogen mineralization are linked in soils, we used a controlled laboratory mineralization approach and compared carbon and nitrogen dynamics in the bulk soil and in soil fractions. Topsoil of a Rendzic Leptosol from a beech forest site near Tuttlingen, Germany, was fractionated into three particle size classes: sand (2000 to 20 µm), silt (20 to 2 µm), and clay (< 2 µm). Bulk soil and particle size fractions were incubated for 40 weeks allowing periodic destructive sampling. We monitored carbon and nitrogen mineralization dynamics, and assessed carbon respiration as well as nitrogen mineralization and microbial biomass carbon and nitrogen contents. Soil organic matter in the incubated fractions was considered by a subsequent density fractionation. The chemical composition of selected samples was qualitatively evaluated by 13C-NMR spectroscopy. When summing up the mineralization rates of the single fractions, the values for respired carbon equaled the bulk soil, whereas the mathematical recombination of mineral nitrogen in all fractions was significantly less than in bulk soil. Hence, carbon mineralization was not affected by the damage of the aggregated soil structure via fractionation, whereas nitrogen mineralization was reduced. Fractionation increased the surface area providing accessory mineral surfaces, which allowed new binding of especially nitrogen-rich compounds, besides ammonium fixation via cation exchange. Density fractionation revealed that organic matter in the sand fraction contained mainly particulate organic matter present as light material comprising partly decomposed plant remnants. The organic matter in the clay fraction was mostly adsorbed on mineral surfaces. Organic matter in the sand and in the clay fraction was dominated by O/N-alkyl C indicating low recalcitrance, but the C/N ratio of organic matter narrowed with decreasing particle size. These results also imply that the C/N ratio as well as the alkyl C to O/N-alkyl C ratio are not suitable to draw conclusions regarding biological decomposability of plant residues when characterizing soil fractions where organic matter is mainly stabilized by spatial inaccessibility and by organo-mineral interactions. The specific interactions of both carbon and nitrogen containing components with the mineral matrix strongly modulate the mineralization dynamics, leading to a decoupling of these processes.

  5. Peroneal spastic flatfoot in adolescents with accessory talar facet impingement: a preliminary report.

    PubMed

    Niki, Hisateru; Aoki, Haruhito; Hirano, Takaaki; Akiyama, Yui; Fujiya, Hiroto

    2015-07-01

    This study analyzed imaging, arthroscopic findings, and treatment responses for peroneal spastic flatfoot (PSFF) caused by talocalcaneal impingement at the accessory anterolateral talar facet (AALTF) (accessory talar facet impingement) in 13 adolescents without histories of trauma and tarsal coalition. The AALTF was determined with computed tomography and MRI. Focal abutting bone marrow edema (FABME) on MRI around the AALTF was confirmed. In seven patients who underwent AALTF resection, subtalar arthroscopy was performed. All experienced alleviation PSFF after treatment; reduction in FABME was observed. AALTF resection alone is beneficial for PSFF caused by accessory talar facet impingement when peroneal spasms are restored by an injection of local anesthesia. PMID:25856276

  6. 29 CFR 1919.27 - Unit proof tests-winches, derricks and gear accessory thereto.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) GEAR CERTIFICATION Certification of Vessels: Tests and Proof Loads; Heat Treatment; Competent Persons § 1919.27 Unit proof tests—winches, derricks and gear accessory thereto....

  7. 29 CFR 1919.28 - Unit proof tests-cranes and gear accessory thereto.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) GEAR CERTIFICATION Certification of Vessels: Tests and Proof Loads; Heat Treatment; Competent Persons § 1919.28 Unit proof tests—cranes and gear accessory thereto. (a) Except...

  8. 26 CFR 48.4062(b)-1 - Rebuilt parts or accessories sold on an exchange basis.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(b)-1 Rebuilt parts or accessories sold on an exchange basis. The sale price...

  9. 26 CFR 48.4062(b)-1 - Rebuilt parts or accessories sold on an exchange basis.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(b)-1 Rebuilt parts or accessories sold on an exchange basis. The sale price...

  10. 26 CFR 48.4061(b)-3 - Rebuilt, reconditioned, or repaired parts or accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4061(b)-3 Rebuilt, reconditioned, or repaired parts or accessories. (a) Rebuilt...

  11. 26 CFR 48.4062(b)-1 - Rebuilt parts or accessories sold on an exchange basis.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(b)-1 Rebuilt parts or accessories sold on an exchange basis. The sale price...

  12. 26 CFR 48.4061(b)-3 - Rebuilt, reconditioned, or repaired parts or accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4061(b)-3 Rebuilt, reconditioned, or repaired parts or accessories. (a) Rebuilt...

  13. 26 CFR 48.4062(a)-1 - Specific parts or accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(a)-1 Specific parts or accessories. Spark plugs, storage batteries, leaf...

  14. 26 CFR 48.4062(a)-1 - Specific parts or accessories.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(a)-1 Specific parts or accessories. Spark plugs, storage batteries, leaf...

  15. 26 CFR 48.4062(b)-1 - Rebuilt parts or accessories sold on an exchange basis.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(b)-1 Rebuilt parts or accessories sold on an exchange basis. The sale price...

  16. 26 CFR 48.4062(a)-1 - Specific parts or accessories.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(a)-1 Specific parts or accessories. Spark plugs, storage batteries, leaf...

  17. 26 CFR 48.4061(b)-3 - Rebuilt, reconditioned, or repaired parts or accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4061(b)-3 Rebuilt, reconditioned, or repaired parts or accessories. (a) Rebuilt...

  18. 26 CFR 48.4061(b)-3 - Rebuilt, reconditioned, or repaired parts or accessories.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4061(b)-3 Rebuilt, reconditioned, or repaired parts or accessories. (a) Rebuilt...

  19. 26 CFR 48.4062(a)-1 - Specific parts or accessories.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4062(a)-1 Specific parts or accessories. Spark plugs, storage batteries, leaf...

  20. 21 CFR 882.4300 - Manual cranial drills, burrs, trephines, and their accessories

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull. (b) Classification. Class II (performance...

  1. 21 CFR 882.4300 - Manual cranial drills, burrs, trephines, and their accessories

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull. (b) Classification. Class II (performance...

  2. 21 CFR 882.4300 - Manual cranial drills, burrs, trephines, and their accessories

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull. (b) Classification. Class II (performance...

  3. 21 CFR 882.4300 - Manual cranial drills, burrs, trephines, and their accessories

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull. (b) Classification. Class II (performance...

  4. 21 CFR 882.4300 - Manual cranial drills, burrs, trephines, and their accessories

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...cranial drills, burrs, trephines, and their accessories are bone cutting and drilling instruments that are used without a power source on a patient's skull. (b) Classification. Class II (performance...

  5. Application of Garnet-Accessory Phase Thermometry: a Combined EMP and SIMS Study

    Microsoft Academic Search

    J. M. Pyle; C. G. Daniel; F. S. Spear; G. D. Layne

    2003-01-01

    Fe-Mg exchange thermometry involving garnet and other phases requires appropriate bulk compositions, and is often compromised by bulk diffusion within garnet and retrograde net-transfer reactions that dissolve garnet or shift biotite compositions. Application of garnet-accessory phase thermometry provides a robust, multi-faceted alternative. Garnet-accessory phase pairs are resistant to diffusive reequilibration of Y and HREE, display evidence for an approach to

  6. Health warning labelling practices on narghile (shisha, hookah) waterpipe tobacco products and related accessories

    Microsoft Academic Search

    Rima Nakkash; Joanna Khalil

    2010-01-01

    BackgroundWaterpipe tobacco smoking prevalence is increasing around the globe despite current evidence that smoke emissions are toxic and contain carcinogenic compounds.ObjectiveTo evaluate current health warning labelling practices on waterpipe tobacco products and related accessories.MethodsAll waterpipe tobacco products, as well as waterpipe accessories, were purchased from Lebanon and a convenience sample was obtained from Dubai (United Arab Emirates), Palestine, Syria, Jordan,

  7. New Minerals and Science.

    ERIC Educational Resources Information Center

    Birch, William D.

    1997-01-01

    Defines geodiversity, compares it to biodiversity, and discusses the mineral classification system. Charts the discovery of new minerals in Australia over time and focuses on uses of these minerals in technological advances. (DDR)

  8. Mineral Sands Down Under

    NSDL National Science Digital Library

    This resource describes what mineral sands are, and discusses the heavy, dark-colored minerals that they contain (rutile, ilmenite, zircon, monazite). A map shows locations of mineral sands deposits in Australia.

  9. Minerals and Fossils

    NSDL National Science Digital Library

    mineraltown.com

    This site is dedicated to rock and mineral collecting. It contains information for worldwide mineral and fossil collectors with articles, mineral photos, videos, a search engine and free classified ads.

  10. Mineral spirits poisoning

    MedlinePLUS

    Mineral spirits are liquid chemicals used to thin paint and as a degreaser. Mineral spirits poisoning occurs ... Mineral spirits ( Stoddard solvent ) Some paints Some floor and ... fluids White spirits Note: This list may not be all-inclusive.

  11. Multivariate proteomic profiling identifies novel accessory proteins of coated vesicles.

    PubMed

    Borner, Georg H H; Antrobus, Robin; Hirst, Jennifer; Bhumbra, Gary S; Kozik, Patrycja; Jackson, Lauren P; Sahlender, Daniela A; Robinson, Margaret S

    2012-04-01

    Despite recent advances in mass spectrometry, proteomic characterization of transport vesicles remains challenging. Here, we describe a multivariate proteomics approach to analyzing clathrin-coated vesicles (CCVs) from HeLa cells. siRNA knockdown of coat components and different fractionation protocols were used to obtain modified coated vesicle-enriched fractions, which were compared by stable isotope labeling of amino acids in cell culture (SILAC)-based quantitative mass spectrometry. 10 datasets were combined through principal component analysis into a "profiling" cluster analysis. Overall, 136 CCV-associated proteins were predicted, including 36 new proteins. The method identified >93% of established CCV coat proteins and assigned >91% correctly to intracellular or endocytic CCVs. Furthermore, the profiling analysis extends to less well characterized types of coated vesicles, and we identify and characterize the first AP-4 accessory protein, which we have named tepsin. Finally, our data explain how sequestration of TACC3 in cytosolic clathrin cages causes the severe mitotic defects observed in auxilin-depleted cells. The profiling approach can be adapted to address related cell and systems biological questions. PMID:22472443

  12. Comparative morphology of the accessory olfactory bulb in bats.

    PubMed Central

    Frahm, H D; Bhatnagar, K P

    1980-01-01

    Bouin-perfused brains of 148 bats (76 species, 48 genera, 8 families) were examined in serial sections for the presence of an accessory olfactory bulb. A moderate to well developed AOB was identified in 26 species. However, absence of an AOB in a particular species does not preclude its presence in some other species of that genus. Descriptions and measurements of the AOBs of each species are reported. The unmyelinated vomeronasal nerve enters the bulb medially and posteriorly. The glomeruli, variable in diameter, appear better circumscribed than previously described. Mitral cells often form thick layers, up to five cells deep, which sometimes reach the dorsolateral surface of the bulb formation. Both external and internal plexiform layers are thin. The latter, however is seen only in a few species. The internal granular layer, reaching the ventricular ependyma in some species, is a prominent component of the bulb. The pars dorsalis of the lateral olfactory tract usually courses between the mitral and internal granular layers. The chiropteran AOB does not differ in significant detail from that of insectivores, primates and other mammals. The occurrence of a functional vomeronasal system in the frugivorous, nectarivorous, and sanguivorous Phyllosotomatidae points to a primary functional role of this system in feeding strategy, at least in bats. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:7400042

  13. Male Accessory Gland Infection: Relevance of Serum Total Testosterone Levels

    PubMed Central

    Condorelli, R. A.; Calogero, A. E.; Vicari, E.; Favilla, V.; Cimino, S.; Russo, G. I.; Morgia, G.; La Vignera, S.

    2014-01-01

    Aim of the present study was to evaluate the different ultrasound characterization of fertile symptomatic patients with MAGI (male accessory gland infection) according to different serum concentrations of total T (TT). We analyzed the ultrasound and hormonal data of 200 patients aged between 24.0 and 67.0 years. Patients were divided into six groups according to the sextile distribution of TT. Patients with serum concentrations of TT < 3.6?ng?mL?1 had a higher mean duration of symptoms compared to the other examined groups. Patients with serum concentrations of TT > 6.6?ng?mL?1 showed a frequency of ultrasound criteria suggestive for bilateral form of prostatitis and prostate-vesiculo-epididymitis and significantly lower compared to the other examined groups. At multivariate logistic regression analysis adjusted for age and BMI, TT was an independent predictive factor of prostatovesiculitis (OR = 0.818 [95% CI: 0.675–0.992]; P < 0.01) and prostate-vesiculo-epididymitis (OR = 0.714 [95% CI: 0.578–0.880]; P < 0.01), which represent the main forms of complicated MAGI. The results of this study suggest that male hypogonadism could be associated with a different ultrasound characterization of these patients. PMID:25276133

  14. Minerals yearbook vol. I: metals and minerals

    USGS Publications Warehouse

    U.S. Geological Survey

    0000-01-01

    This volume, covering metals and minerals, contains chapters on approximately 90 commodities. In addition, this volume has chapters on mining and quarrying trends and on statistical surveying methods used by Minerals Information, plus a statistical summary.

  15. Importance of preexcited QRS morphology during induced atrial fibrillation to the diagnosis and localization of multiple accessory pathways.

    PubMed

    Fananapazir, L; German, L D; Gallagher, J J; Lowe, J E; Prystowsky, E N

    1990-02-01

    The present investigation evaluates the ability of several electrocardiographic (ECG) and electrophysiologic methods to identify multiple accessory pathways in 47 patients in whom the presence and sites of multiple accessory pathways were confirmed intraoperatively. To establish ECG features that suggested the presence of multiple accessory pathways in these patients, we initially studied the 12-lead ECG during maximal preexcitation in 101 patients with single accessory pathways. Distinctive 12-lead ECG patterns were noted for six defined anatomic areas around the right and left atrioventricular groove. Multiple preexcited QRS morphologies, each typical for a separate accessory pathway, and atypical preexcited QRS morphologies were recorded during atrial fibrillation in 31 of 47 (66%) patients with multiple accessory pathways. By comparison, the ECG during sinus rhythm and rapid atrial pacing identified 14 (32%) and 26 (55%) of the patients, respectively. In 12 (26%) patients in whom evidence for multiple accessory pathways was absent from endocardial mapping data, atrial fibrillation provided the diagnosis. In five (11%) patients, atrial fibrillation was the only method that demonstrated the presence of multiple accessory pathways. A combination of ECG findings during atrial fibrillation and rapid atrial pacing plus endocardial mapping data identified 43 (91%) of the patients with multiple accessory pathways. There were two unique fusion patterns on the 12-lead ECG that were characteristic of specific multiple accessory pathway combinations.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:2297863

  16. Identification of Accessory Spleens During Laparoscopic Splenectomy Is Superior to Preoperative Computed Tomography for Detection of Accessory Spleens

    PubMed Central

    Pahuja, Anil K.; Németh, Zoltán H.; Abkin, Alexander; Carter, Mitchel S.

    2012-01-01

    Background: Missed accessory spleen (AcS) can cause recurrence of hematologic disease after splenectomy. The objective of the study was to determine whether detection of AcS is more accurate with preoperative computed tomography (CT) scan or with exploration during laparoscopic splenectomy. Methods: A retrospective chart review was performed for 75 adult patients who underwent laparoscopic splenectomy for various hematologic disorders from 1999 to 2009. Preoperative CT scans were performed in all patients. Patients were followed for recurrence of disease, and a scintigraphy scan was performed in those with suspected missed AcS. Results: The most common diagnosis was idiopathic thrombocytopenic purpura in 29 patients (39%), followed by non-Hodgkin's lymphoma in 22 patients (29%). Sixteen AcSs were found during surgery in 15 patients (20%), and preoperative CT scan identified 2 of these. Twelve AcSs were located at the splenic hilum (75%). Nine patients experienced recurrence of their disease, and none had a missed AcS on subsequent scintigraphy. Sensitivity of exploratory laparoscopy for detection of AcS was 100%, and for preoperative CT scan was 12.5% (P = .005). Conclusion: Exploratory laparoscopy during splenectomy is more accurate than preoperative imaging with CT scan for detection of AcS. Preoperative CT scan misses AcS frequently and should not be obtained for the purpose of its identification. PMID:23318063

  17. Regulation of STREX BK channels by the ?4 Accessory Subunit

    PubMed Central

    Petrik, David; Brenner, Robert

    2007-01-01

    Large conductance (BK-type) calcium-activated potassium channels utilize alternative splicing and association with accessory ? subunits to tailor BK channel properties to diverse cell types. Two important modulators of BK channel gating are the neuronal-specific ?4 subunit and alternative splicing at the STREX exon. Individually, these modulators affect the gating properties of the BK channel as well as its response to phosphorylation. In this study, the combined functional consequences of STREX and the ?4 subunit on BK channel biophysical properties were investigated in transfected HEK293 cells. Surprisingly, we found that the combined effects of STREX and ?4 are non-additive and even opposite for some properties. At high calcium, ?4 or the STREX exon individually share properties that promote BK channel opening via slowing of deactivation. However, the combined effects are a speeding of deactivation and a decreased open probability. ?4 also inhibits BK channel opening by a slowing of activation. This effect occurs across calcium concentrations in the absence of STREX, but predominates only at low calcium for STREX containing channels. BK channel response to phosphorylation status are also altered by the combination of the ?4 subunit and the STREX exon. ?4/STREX channels show a slowing of activation kinetics following dephosphorylation whereas ?4 channels lacking STREX do not. In contrast, ?4 confers a speeding of activation in response to cAMP-dependent phosphorylation in channels lacking STREX, but not in channels containing the STREX exon. These results indicate that the combination of the ?4 subunit and STREX exon confer non-additive and unique properties to BK channels. Analysis of expression in brain slices suggests that STREX and ?4 mRNA overlap expression in the dentate gyrus of the hippocampus and the cerebellar purkinje cells, suggesting that these unique properties of BK channels may underlie BK channel gating in these cells. PMID:17945424

  18. Morphology and connections of the abdominal accessory neurons of the crayfish Cherax destructor.

    PubMed

    Drummond, Joanne M; Macmillan, David L

    2004-02-16

    Associated with the abdominal muscle receptor organs of crayfish are accessory neurons that inhibit the activity of the stretch receptors. Cobalt infusion into their cut axons reveals four accessory somata associated with each hemiganglion in the abdomen of the crayfish Cherax destructor. These conform to the pattern described previously for these neurons: The cell bodies are in the ganglion posterior to the one from which they exit. We recorded intracellularly from the largest accessory neurons, Acc-1 and Acc-2, and stained them with intracellular dye to establish unambiguously the characteristics defining their identity and structure. We describe their branching patterns in the ganglion of origin and the ganglion of exit. This morphological information permitted us to distinguish all four accessory neurons in preparations with dye infused through their cut axons, and we propose a revised, unambiguous nomenclature for the two smaller ones. Our intracelluar recordings allowed us to reexamine the physiological relationships of Acc-1 and Acc-2, the only accessory neurons for which there are data in the literature. In general, the connections and inputs described in previous studies were substantiated, although there has clearly been confusion between the two, and they differ in a number of significant ways. We found that they are seldom active together, have different firing patterns, and may operate with different clusters of extensor and flexor motorneurons. The results illustrate the level at which the accessory neurons operate within the abdominal control system but do not distinguish between competing hypotheses concerning their role in behavior. The data are consistent with the view that accessory neurons assist in timing between adjacent segments. PMID:14755535

  19. Efferents and centrifugal afferents of the main and accessory olfactory bulbs in the snake Thamnophis sirtalis.

    PubMed

    Lanuza, E; Halpern, M

    1998-01-01

    This study reinvestigates the efferent projections of the main and accessory olfactory bulbs and describes for the first time the centrifugal projections to the main and accessory olfactory bulbs in the snake Thamnophis sirtalis, using the intraaxonal transport of the anterograde and retrograde tracer biotinylated dextran amine and the retrograde tracer horseradish peroxidase. The olfactory projection consists of three tracts: the lateral olfactory tract, which projects bilaterally to the lateral cortex and the rostral amygdala, crossing the midline through the stria medullaris-habenular commissure system; the intermediate olfactory tract, which projects ipsilaterally to the olfactory tubercle and contributes to the contralateral projection; and the medial olfactory tract, which projects ipsilaterally to the dorsomedial retrobulbar formation. The vomeronasal projection is formed by a single tract, the accessory olfactory tract, that projects ipsilaterally to the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus. The centrifugal projections to the main and accessory olfactory bulb are composed of two components: one that arises in areas that receive the olfactory or vomeronasal input (neurons in the olfactory tubercle, retrobulbar formation and lateral cortex project to the main olfactory bulb; and neurons in the nucleus of the accessory olfactory tract, the medial amygdala and the nucleus sphericus project to the accessory olfactory bulb), and another that arises in areas not directly implicated in processing the chemosensory information (the nucleus of the diagonal band of Broca and the dorsal cortex). These data allow the recognition of the general pattern of organization of the reptilian olfactory and vomeronasal systems. PMID:9435967

  20. Calculating a Mineral's Density

    NSDL National Science Digital Library

    Andrea Distelhurst

    2011-10-05

    Students will use the Density=Mass/Volume formula to calculate the density of an unknown mineral. By using water displacement and a triple beam balance students will collect measurements of volume and mass for an unknown mineral. With this data, they will calculate the mineral's density then identify the mineral based on calculated density.

  1. Mineral Scavenger Hunt

    NSDL National Science Digital Library

    National Museum of Natural History

    2010-01-01

    In this activity, learners participate in a scavenger hunt, searching for and recognizing minerals and products that contain minerals. They make note of their finds on a Mineral Scavenger Hunt checklist. Learners search for the materials in their classroom, at home, or even in stores. This resource includes discussion questions to encourage learner reflection about how minerals play a role in daily life.

  2. Introduction to Minerals

    NSDL National Science Digital Library

    This activity can be used as the introduction for a unit on mineral or crystal structure. It requires the students to create shapes cooperatively and put them together. This is analogous to individual crystals forming or to minerals forming. They will understand that minerals are made up of structures in certain patterns, and that these structures determine some of the properties of the minerals.

  3. Minerals in our environment

    USGS Publications Warehouse

    Weathers, Judy; Galloway, John; Frank, Dave

    2000-01-01

    Minerals are found everywhere in our daily lives. This poster depicts numerous items found throughout a home, and the mineral(s) or mineral resources used in the ingredients of, or construction/manufacturing of those items. Designed for K-8 Teachers this poster can be scaled and is printable at 36" x 60" and legible at 11" x 17" in size.

  4. Earth's Mineral Evolution

    E-print Network

    Downs, Robert T.

    minerals in ancient interstellar dust grains to the thousands of mineral species on the present-day EarthEarth's Mineral Evolution :: Astrobiology Magazine - earth science - evol...rth science evolution Extreme Life Mars Life Outer Planets Earth's Mineral Evolution Summary (Nov 14, 2008): New research

  5. Accessory cell function in the Con A response: role of Ia-positive and Ia-negative accessory cells.

    PubMed

    Bekoff, M; Kakiuchi, T; Grey, H M

    1985-03-01

    We have examined the role of Ia-positive and Ia-negative accessory cells (AC) and soluble factors in Con A-stimulated murine T cell activation. Supernatant fluids containing interleukin 1 (IL 1) derived from the P388D1 macrophage cell line and from a lipopolysaccharide (LPS)-stimulated macrophage hybridoma provided only partial reconstitution of the response of purified T cells (18 to 27%). The complete reconstitution obtained with gamma-irradiated spleen cells or LPS-activated B cells was inhibited by approximately 60 to 77% when anti-Ia antibody was included in the culture. Despite this apparent involvement of Ia+ spleen AC, Ia-negative L cell AC could also reconstitute the response of both Class I-restricted Lyt-2+ T cells and Class II-restricted L3T4+ T cells. When the Ia-negative AC were employed, the L3T4 antigen on L3T4+ T cells played a critical role because addition of anti-L3T4 antibody to the culture inhibited the response by 85 to 90%. In contrast, anti-L3T4 did not inhibit the response in the presence of spleen AC. These results suggest that the molecules involved in T cell-AC interactions may vary depending on the AC source. Moreover, at least one of the putative target ligands for L3T4 presumably is not Ia, because anti-L3T4 inhibited T cell stimulation when Ia-negative AC were used. PMID:3881521

  6. Suprascapular nerve release for treatment of shoulder and periscapular pain following intracranial spinal accessory nerve injury.

    PubMed

    Flores, Leandro Pretto

    2008-11-01

    Iatrogenic injury to the spinal accessory nerve is one of the most common causes of trapezius muscle palsy. Dysfunction of this muscle can be a painful and disabling condition because scapular winging may impose traction on the soft tissues of the shoulder region, including the suprascapular nerve. There are few reports regarding therapeutic options for an intracranial injury of the accessory nerve. However, the surgical release of the suprascapular nerve at the level of the scapular notch is a promising alternative approach for treatment of shoulder pain in these cases. The author reports on 3 patients presenting with signs and symptoms of unilateral accessory nerve injury following resection of posterior fossa tumors. A posterior approach was used to release the suprascapular nerve at the level of the scapular notch, transecting the superior transverse scapular ligament. All patients experienced relief of their shoulder and scapular pain following the decompressive surgery. In 1 patient the primary dorsal branch of the C-2 nerve root was transferred to the extracranial segment of the accessory nerve, and in the other 2 patients a tendon transfer (the Eden-Lange procedure) was used. Results from this report show that surgical release of the suprascapular nerve is an effective treatment for shoulder and periscapular pain in patients who have sustained an unrepairable injury to the accessory nerve. PMID:18976092

  7. Cell membrane is a major locus for ultraviolet B-induced alterations in accessory cells.

    PubMed Central

    Krutmann, J; Khan, I U; Wallis, R S; Zhang, F; Rich, E A; Ellner, J J; Elmets, C A

    1990-01-01

    In vitro ultraviolet B (UVB) irradiation of human blood monocytes inhibits their accessory cell function for antigen- and mitogen-induced T cell responses. These studies were designed to characterize the nature of the UVB-induced defect in human monocyte accessory cell function. Irradiated monocytes were deficient in their ability to serve as accessory cells for OKT3-induced T cell activation. In vitro exposure of monocytes to 100 J/m2 UVB completely inhibited the T cell proliferative response (51502 cpm, non-UVB-irradiated; 302 cpm, UVB-irradiated). Analysis of the accessory signals altered by UVB indicated that irradiated monocytes were incapable of binding to OKT3 molecules attached to the CD3 antigen on T cells. Provision of an alternative mechanism for binding of OKT3 molecules by attaching anti-mouse IgG to the bottom of microtiter wells completely restored accessory cell function. Further characterization of the defect demonstrated that UVB radiation did not deplete p72 Fc receptors from the surface of irradiated monocytes. However, UVB exposure did produce a dose-dependent decrease in monocyte membrane expression of ICAM-1. It is proposed that UVB radiation leads to changes within the cell membrane that inhibit the ability of monocytes to express selected molecules necessary for binding of T cells. Images PMID:1970582

  8. Post-splenectomy intrapancreatic accessory spleen mimicking endocrine tumor of the pancreas

    PubMed Central

    Zhu, Hong-xu; Lou, Wen-hui; Kuang, Tian-tao; Wang, Dan-song

    2014-01-01

    INTRODUCTION Intrapancreatic accessory spleen is an uncommon congenital abnormality of the spleen with no indication for surgical intervention. Among the few cases reported, IPAS coexisted with a normal spleen. We here report the first case of IPAS arising a couple years after splenectomy with the appearance of an endocrine tumor of the pancreas. PRESENTATION OF CASE A 62-year-old female presented with a one-week history of left upper quadrant discomfort. She had splenectomy for the treatment of hypersplenism caused by cirrhotic portal hypertension two years before this admission. Her physical examination was unremarkable and laboratory data was within the normal range. Both the ultrasonography and magnetic resonance image revealed a small oval-shaped mass in the tail of her pancreas with the diameter 2 cm or less. A distal pancreatectomy was performed for the suspection of malignant neuroendocrine tumor of the pancreas. An intrapancreatic accessory spleen was confirmed by the pathologic examination. DISCUSSION Intrapancreatic accessory spleen is one kind of congenital ectopic spleen without indication for operative intervention. We present the case to support that intrapancreatic accessory spleen may enlarge through a compensatory mechanism, and raise the awareness of this intrapacreatic entity to avoid unnecessary surgical operation. CONCLUSION IPAS should be highly considered as a differential diagnosis while the lesion is no more than 2.5 cm in diameter and/or other accessory spleens show around the splenic hilum. PMID:25437661

  9. Minerals 4 Kids

    NSDL National Science Digital Library

    Nancy McMillan

    Minerals 4 Kids contains four Web-based activities offered for K-12 Education by the Mineralogical Society of America (MSA). These activities are entitled: Minerals in Your House, Mineral Groups, Mineral Properties, and All About Crystals. Also included are links to Mineral Games, the Rock Cycle diagram that leads to descriptions of the three rock types, and Ask-A-Mineralogist that enables the user to submit a mineralogical question. Many of these activities are linked to other mineralogy-related Web sites. Minerals in Your House is designed to introduce the concept of how minerals are present in common household items found in the bedroom, bathroom, living room, and kitchen. Mineral Groups introduces mineral classification according to chemical composition. The learner can explore each of the seven major chemical groups and several minor chemical groups. Mineral Properties introduces learners to the physical properties of minerals such as hardness, cleavage, streak, color, luster, specific gravity, as well as other miscellaneous properties (i.e., magnetic, effervescence, striations, etc.). Mineral Properties, additionally, contains a five-step Mineral Identification process that uses the physical properties to narrow down a mineral's identity that, ultimately, leads to a Mineral Identification Chart. All About Crystals enables the learner to become familiar with symmetry, crystal symmetry, crystal chemistry, and crystal forms. This activity includes online 3-D models, an activity that enables the user to draw and explore symmetry patterns, a variety of detailed descriptions with figures, and an extensive vocabulary

  10. Spinal accessory neuropathy associated with the tumor located on the jugular foramen.

    PubMed

    Lee, Soyoung; Yang, Shimo; Lee, Jieun; Kim, Inhwan

    2013-02-01

    Spinal accessory neuropathy is commonly caused by iatrogenic injury or secondary to trauma or infection. Nevertheless, the tumor related palsy is rare. We present a case of an 18-year-old male patient suffering from paralysis of his right trapezius and sternocleidomastoid muscle. An electrophysiologic diagnostic study confirmed the spinal accessory neuropathy of the proximal segment. In addition, magnetic resonance imaging showed the location of tumor on the jugular foramen. However, the type of the tumor was not confirmed through biopsy because the patient refused surgical procedure. Based on the study, it is hypothesized that the tumor located on the jugular foramen should be considered as a cause of the spinal accessory nerve of the proximal segment. PMID:23526381

  11. Accessory lateral rectus in a patient with normal ocular motor control.

    PubMed

    Liao, Yaping Joyce; Hwang, Jaclyn J

    2014-06-01

    Although supernumerary extraocular muscles are common in monkeys and other species, they are relatively rare in humans and typically are noted in the context of childhood strabismus. We present a case of an incidentally found unilateral accessory lateral rectus muscle in a 51-year-old woman with normal ocular motor control. In this patient, the accessory lateral rectus was approximately 10% the size of a normally sized lateral rectus muscle. It originated from the orbital apex, traveled between the optic nerve and the lateral rectus and attached to the superolateral aspect of the globe. This unique case demonstrates that accessory lateral rectus in humans may have no impact on eye movement and ocular alignment. PMID:24796602

  12. Accessory Central Cusp in the Maxillary Second Primary Molars: A Rare Entity among the Rare

    PubMed Central

    Das, Monalisa

    2014-01-01

    ABSTRACT% Central accessory cusp in primary molars is an extremely rare condition which is due to abnormal proliferation and folding of inner enamel epithelium during morphodifferentiation stage of tooth development. The extension of the pulp in the cuspal area is often the reason for early involvement of pulp by the caries process. Therefore, early diagnosis and treatment planning is necessary to maintain the integrity of primary dental arch. This article reports such a case of central accessory cusps involving maxillary second primary molars. How to cite this article: Chandra B, Das M. Accessory Central Cusp in the Maxillary Second Primary Molars: A Rare Entity among the Rare. Int J Clin Pediatr Dent 2014;7(3):202-205. PMID:25709302

  13. Mineral Spectroscopy Server

    NSDL National Science Digital Library

    George Rossman

    This server is primarily dedicated to providing information about color in minerals and access to data on mineral absorption in the visible, infrared, Raman and Mossbauer spectra. Both data coordinates and images of the spectra are available for selected minerals. Most data on the server were obtained in the Caltech mineral spectroscopy labs, but individuals throughout the world also contribute to this ever growing community resource. In addition to data files, the site provides an extensive list of references to papers on mineral optical spectroscopy. Citations are available sorted both by mineral name and by first authors of papers.

  14. ESF GROUND SUPPORT - MATERIAL DEDICATION ANALYSIS FOR STRUCTURAL STEEL AND ACCESSORIES FROM A COMMERCIAL GRADE SOURCE

    SciTech Connect

    M.D. Stine

    1996-01-23

    The purpose of this analysis is to select the critical characteristics to be verified for steel sets and accessories and the verification methods to be implemented through a material dedication process for the procurement and use of commercial grade structural steel sets and accessories (which have a nuclear safety function) to be used in ground support (with the exception of alcove ground support and alcove opening framing, which are not addressed in this analysis) for the Exploratory Studies Facility (ESF) Topopah Spring (TS) Loop. The ESF TS Loop includes the North Ramp, Main Drift, and South Ramp underground openings.

  15. Optical diffuse reflectance accessory for measurements of skin tissue by near-infrared spectroscopy

    NASA Astrophysics Data System (ADS)

    Marbach, R.; Heise, H. M.

    1995-02-01

    An optimized accessory for measuring the diffuse reflectance spectra of human skin tissue in the near-infrared spectral range is presented. The device includes an on-axis ellipsoidal collecting mirror with efficient illumination optics for small sampling areas of bulky body specimens. The optical design is supported by the results of a Monte Carlo simulation study of the reflectance characteristics of skin tissue. Because the results evolved from efforts to measure blood glucose noninvasively, the main emphasis is placed on the long-wavelength near-infrared range where sufficient penetration depth for radiation into tissue is still available. The accessory is applied for in vivo diffuse reflectance measurements.

  16. Ongoing pain and deformity after an excision of the accessory navicular.

    PubMed

    Vaughan, Philip; Singh, Dishan

    2014-09-01

    Although a painful accessory navicula and a pes planus often coexist, they are not necessarily causally related, and each condition should be assessed and treated individually. A child or adolescent will notice the rubbing of an accessory navicula against footwear as the foot and boney swelling grows. The cause of persistent local pain such as inadequate bony resection, scar pain, irritation of the tibialis posterior tendon, and so forth should be sought and addressed; management will depend on the specific presentation and previous procedure performed. The cause of the ongoing pain should be investigated. PMID:25129360

  17. Anatomic and electrophysiologic relation between the coronary sinus and mitral annulus: Implications for ablation of left-sided accessory pathways

    Microsoft Academic Search

    Jerold S. Shinbane; Michael D. Lesh; William G. Stevenson; Thomas S. Klitzner; Paul D. Natterson; Isaac Wiener; Philip C. Ursell; Leslie A. Saxon

    1998-01-01

    To determine whether precise left-sided accessory pathway localization is possible from the coronary sinus, electrocardiogram (ECG) characteristics from the coronary sinus pair demonstrating earliest activation via the accessory pathway were compared to simultaneous mitral annular ablation catheter ECGs at successful ablation sites in 48 patients. To define the coronary sinus–mitral annular relation, the coronary sinus to mitral annulus distance (D)

  18. The use of the scanning electron microscope in the determination of the mineral composition of Ballachulish slate

    SciTech Connect

    Walsh, Joan A. [University of Paisley, Scotland (United Kingdom)], E-mail: ja_walsh@tiscali.co.uk

    2007-11-15

    Slate is a fine-grained, low-grade metamorphic rock derived from argillaceous sediments or occasionally volcanic ash. Although most slates contain mainly quartz, chlorite and white mica, they vary considerably in their durability, some lasting centuries while others fail after a few years of service. A detailed characterisation of their mineralogy is required for the assessment of performance, and to establish the provenance of a used slate. A combination of methods was used to examine Ballachulish slates; XRD analysis to determine the principal minerals present, XRF analysis to determine the total chemical composition, and scanning electron microscopy to determine the chemical composition of individual minerals. It was found that the white mica in Ballachulish slate is phengite and the chlorite is ripidolite. Feldspar is present as albite and carbonate as ferroan dolomite. Several accessory minerals were also identified, including chloritoid, monzonite and zircon. There was considerable variation in the ratio of the principal minerals, making it impossible to identify used slates by this criterion. Instead, chemical composition of the individual minerals, and possibly key accessory minerals, should be used to determine the provenance of slates.

  19. MINERAL FACILITIES MAPPING PROJECT

    E-print Network

    Gilbes, Fernando

    -Sam Minerals Information Team (MIT) USGS Summer Internship 2009 U.S. Department of the Interior U.S. Geological #12;#12;ALGERIA Algeria Mineral Facilities Northwest of Africa Scale: 1:9 km #12;IRAN Northwest

  20. Bartering for Minerals.

    ERIC Educational Resources Information Center

    May, Kathie

    2002-01-01

    Presents an activity in which students are assigned occupations that rely on specific minerals. To obtain the needed minerals, students learn how to trade services and commodities. Includes details on preparation, modeling behaviors, and printed materials. (DDR)

  1. Sedimentary and Related Minerals

    NSDL National Science Digital Library

    Dexter Perkins

    In this three-part exercise, students study hand samples and thin sections of sedimentary minerals and rocks. Part one - Box of Rocks: Students examine a tray of Halides, Carbonates, Borates, and Clays and record their physical properties, composition, habit, and occurence. They note chemical and physical similarities and differences of the minerals. Part two - Definitions: Define a list of terms relevent to the lab. Part three - Minerals in Thin Section: Observe sedimentary minerals in thin section and answer questions about them.

  2. INTRODUCTION TO MINERALS

    NSDL National Science Digital Library

    Mr. Hughes

    2005-10-23

    DESK Standard: Understand the basic properties of minerals. . DATES: You can begin this activity on December 11. You should complete it by December 15. OBJECTIVE: You will visit Web sites to learn more about minerals. You will record 10 interesting facts about minerals on a blank sheet of paper. After visiting the last Web ...

  3. American Strategic Minerals

    Microsoft Academic Search

    Mangone

    1984-01-01

    American Strategic Minerals brings together seven contributors in the fields of marine studies, mining engineering, earth sciences, and economics to discuss and analyze strategic minerals. The future demands of the United States upon limited sources of supply are examined and there is an analysis of alternative sources of strategic minerals from the seabed, including copper, nickel, manganese, and cobalt. The

  4. Minerals in our Environment

    NSDL National Science Digital Library

    This downloadable poster (36 in. by 60 in.) describes how minerals are used in household substances and objects, listed by name, with numbers corresponding to locations in a typical house. For example, in the kitchen, appliances contain steel and copper, clay minerals are found in china, and table salt contains the mineral halite.

  5. Mineral Properties Sheets

    NSDL National Science Digital Library

    Dave Hirsch

    These sheets are designed to give students a framework for making observations of minerals in hand specimen and (for selected minerals) in thin section. I place most of the emphasis on the distinguishing properties, rather than requiring an exhaustive list. Students use hand specimen observation, thin section observation (for selected minerals) and references to complete the forms.

  6. Preliminary summary review of thorium-bearing mineral occurrences in Alaska

    USGS Publications Warehouse

    Bates, Robert G.; Wedow, Helmuth, Jr.

    1952-01-01

    Thorium-bearing minerals are known at 47 localities in Alaska. At these localities the thorium occurs as a major constituent or in minor amounts as an impurity in one or more of the following 12 minerals: allanite, columbite, ellsworthite, eschynite, gummite, monazite, orangite, parisite, thorianite, thorite, xenotime, and zircon. In addition other minerals, such as biotite and sphene, are radioactive and may contain thorium. Several unidentified columbate minerals with uranium or thorium and uranium as major constituents have been recognized at some localities. The distribution, by type of deposit, of the 57 thorium occurrences is as follows: lode - 3, lode and placer - 1, granitic rock - 3, granitic rock and related placer - 14, and placer - 26. Of the four lode occurrences only the radioactive veins at Salmon Bay in southeastern Alaska and the contact metamorphic deposit in the Nixon Fork area of central Alaska warrant further consideration, although insufficient data are available to determine whether these two deposits have commercial possibilities. The remaining occurrences of thorium-bearing minerals in Alaska are limited to placer deposits and disseminations of accessory minerals in granitic rocks. In most of these occurrences the thorium-bearing minerals occur in only trace amounts and consequently warrent little further consideration. More data are needed to determine the possibilities of byproduct recovery of thorium-bearing minerals from several of the gold and tin placers.

  7. Distribution and analysis of selected economic heavy mineral species within the inner New York Bight

    SciTech Connect

    Drucker, B.S.

    1983-05-01

    Ninety-two surficial sand samples from the inner New York Bight have been analyzed to determine weight percents of eight economic mineral species relative to their respective total heavy mineral assemblages. Particular attention has been focused on delineating areas of significant ilmenite concentration. Total heavy mineral weight percents are highest in the northern portion of the study area and decrease southward. The greatest diversity of economic mineral species is present within the northern portion and three zones within this area where total heavy mineral percentage exceeds 3 percent have been analyzed for potential resources. It is estimated that these three zones contain a minimum of approximately 8 million dry tons of economic mineral species, the bulk of which is zircon. Three zones of significant ilmenite concentration have been delineated within the central portion of the study area. Although total heavy mineral weight percentage ranges from an average of 1.52 to 1.67 percent, ilmenite accounts for an average of 34 to 57 percent of the total weight of the heavies. A minimum of approximately 7 million dry tons of ilmenite is believed to be present within these three zones. However, accessory economic mineral content is extremely low and sewer and dumpsite spoilage may have degraded the quality of the deposits within one of the zones. Until more detailed economic, exploratory, and chemical studies are undertaken, these six zones should be regarded as indicated potential resource zones.

  8. Mineral Fast Ion Conductors and Mineral Solid Electrolyte Batteries

    Microsoft Academic Search

    Wenji Wang

    2002-01-01

    This paper is intended to be a review of the recent situation and advances in the studies of mineral fast ion conductors and mineral solid electrolyte batteries. The reviews involve the following parts: The definition of both mineral fast ion conductor and mineral solid electrolyte battery; Comments on mineral fast ion conductors: Describe some very useful starting mineral materials for

  9. DETERMINING SEX IN POSTHATCHLING LOGGERHEAD SEA TURTLES USING MULTIPLE GONADAL AND ACCESSORY

    E-print Network

    Wyneken, Wyneken Jeanette

    DETERMINING SEX IN POSTHATCHLING LOGGERHEAD SEA TURTLES USING MULTIPLE GONADAL AND ACCESSORY DUCT of the Environment and Earth Sciences, 135 Duke Marine Lab Road, Beaufort, NC 28516, USA ABSTRACT: The sex of young and heteromorphic sex chromosomes, yet internal dimorphic morphology is defined at hatching. We tested

  10. TESTICULE ET SPERMATOGENSE EFFECTS OF FSH, LH AND PROLACTIN ON THE TESTIS AND ACCESSORY

    E-print Network

    Paris-Sud XI, Université de

    TESTICULE ET SPERMATOGENÈSE EFFECTS OF FSH, LH AND PROLACTIN ON THE TESTIS AND ACCESSORY ORGANS. Frequent measurements of plasma LH and testosterone, testis size, skin colour and behaviour - the latter AND SUPERIOR CERVICAL GANGLIO- NECTOMY ON THE TESTIS OF THE VOLE, MICROTUS AGRESTIS. H. M. CHARLTON, C. A

  11. One-stop outpatient management of accessory auricle in children with titanium clip.

    PubMed

    Wong, Phui Yee; Laing, Tereze; Milroy, Catherine

    2014-01-01

    Introduction. Literature on ideal management of accessory auricles is limited. Traditionally, accessory auricles are managed by paediatricians with suture ligation at the base of the accessory auricle to induce ischaemic necrosis (Mehmi et al, 2007). This method can be associated with complications and poor cosmesis thus leading to the vogue of surgical excision ( Frieden et al, 1995; Sebben, 1989). We present our experience in managing these lesions in children with the application of a titanium clip in a one-stop outpatient setting. Methods. Data was collected retrospectively through review of patient records and telephone questionnaire identifying outcomes from the parents' perspective. Results. Of 42 patients, 24 (57.1%) responded. Eleven (26.2%) underwent surgical excision, 6 (14.3%) had no intervention, and 1 (2.4%) was not contactable. All parents were happy with the outcome and would recommend this management to other parents. Twenty-three (96%) had no complications apart from a tiny residual nubbin, which was considered cosmetically acceptable. One child had a residual nubbin that grew in size requiring surgical excision at later stage. Conclusion. Management of accessory auricles by the application of a titanium clip in one-stop outpatient setting is safe, simple, quick, and well tolerated with no need for admission, anaesthesia, or followup due to the low complication rate. PMID:24800069

  12. Type II Endoleaks Involving an Accessory Renal Artery and the Inferior Mesenteric Artery

    SciTech Connect

    Martin, E. C., E-mail: emartin@chpnet.org [St. Luke's-Roosevelt Hospital Center, Department of Radiology (United States); Todd, George J. [St. Luke's-Roosevelt Hospital Center, Department of Surgery (United States)

    2011-02-15

    Two patients are described with type II endoleaks involving an accessory renal artery and the inferior mesenteric artery. One patient was successfully embolized via the translumbar route. The other continues to be observed; the endoleak is expected to close spontaneously because both the inflow and outflow are significantly compromised.

  13. Application of in situ zircon geochronology and accessory phase chemistry to constraining basin development

    E-print Network

    Demouchy, Sylvie

    Application of in situ zircon geochronology and accessory phase chemistry to constraining basin, France) have been studied by ion-microprobe analyses of zircons in order to constrain the age of basin Massif Central during the period 295­300 Ma. Inherited zircons were identified in two out of the five

  14. Metamorphic Rocks and Minerals

    NSDL National Science Digital Library

    Dexter Perkins

    In this three-part exercise, students study hand samples and thin sections of important metamorphic rocks and minerals. Part one - Box of Rocks: Students examine trays of metamorphic rocks and minerals and record their physical properties, composition, and habit. They note chemical and physical similarities and differences and identify the rock samples and minerals they contain. Part two - Definitions: Define a list of terms relevent to the lab. Part three - Minerals in Thin Section: Observe minerals in thin section and answer questions about them.

  15. Diverse Broad-Host-Range Plasmids from Freshwater Carry Few Accessory Genes

    PubMed Central

    Sen, Diya; Yano, Hirokazu; Bauer, Matthew L.; Rogers, Linda M.; Van der Auwera, Geraldine A.

    2013-01-01

    Broad-host-range self-transferable plasmids are known to facilitate bacterial adaptation by spreading genes between phylogenetically distinct hosts. These plasmids typically have a conserved backbone region and a variable accessory region that encodes host-beneficial traits. We do not know, however, how well plasmids that do not encode accessory functions can survive in nature. The goal of this study was to characterize the backbone and accessory gene content of plasmids that were captured from freshwater sources without selecting for a particular phenotype or cultivating their host. To do this, triparental matings were used such that the only required phenotype was the plasmid's ability to mobilize a nonconjugative plasmid. Based on complete genome sequences of 10 plasmids, only 5 carried identifiable accessory gene regions, and none carried antibiotic resistance genes. The plasmids belong to four known incompatibility groups (IncN, IncP-1, IncU, and IncW) and two potentially new groups. Eight of the plasmids were shown to have a broad host range, being able to transfer into alpha-, beta-, and gammaproteobacteria. Because of the absence of antibiotic resistance genes, we resampled one of the sites and compared the proportion of captured plasmids that conferred antibiotic resistance to their hosts with the proportion of such plasmids captured from the effluent of a local wastewater treatment plant. Few of the captured plasmids from either site encoded antibiotic resistance. A high diversity of plasmids that encode no or unknown accessory functions is thus readily found in freshwater habitats. The question remains how the plasmids persist in these microbial communities. PMID:24096417

  16. Activation of muscarinic acetylcholine receptors elevates intracellular Ca(2+) concentrations in accessory lobe neurons of the chick.

    PubMed

    Takahashi, Keita; Kitamura, Naoki; Suzuki, Yuki; Yamanaka, Yuko; Shinohara, Hikaru; Shibuya, Izumi

    2015-04-01

    Accessory lobes are protrusions located at the lateral sides of the spinal cord of chicks and it has been proposed that they play a role as a sensory organ for equilibrium during walking. We have reported that functional neurons exist in the accessory lobe. As there is histological evidence that synaptic terminals of cholinergic nerves exist near the somata of accessory lobe neurons, we examined the effects of acetylcholine on changes in intracellular Ca2+ concentrations ([Ca2+]i), as an index of cellular activities. Acetylcholine (0.1-100 µM) caused a transient rise in the [Ca2+]i. Acetylcholine-evoked [Ca2+]i rises were observed in the absence of extracellular Ca2+, and they were abolished in the presence of cyclopiazonic acid, an inhibitor of Ca2+-ATPase of intracellular Ca2+ stores or atropine, a muscarinic receptor antagonist. mRNAs coding M3 and M5 isoforms of the muscarinic receptors were detected in accessory lobes by the RT-PCR. These results indicate that chick accessory lobe neurons express functional muscarinic acetylcholine receptors, and that acetylcholine stimulates Ca2+ mobilization from intracellular Ca2+ stores, which elevates the [Ca2+]i in the somata of accessory lobe neurons, through activation of these receptors. Cholinergic synaptic transmission to the accessory lobe neurons may regulate some cellular functions through muscarinic receptors. PMID:25481714

  17. Segregated pathways to the vomeronasal amygdala: differential projections from the anterior and posterior divisions of the accessory olfactory bulb.

    PubMed

    Mohedano-Moriano, Alicia; Pro-Sistiaga, Palma; Ubeda-Bañón, Isabel; Crespo, Carlos; Insausti, Ricardo; Martinez-Marcos, Alino

    2007-04-01

    Apically and basally located receptor neurons in the vomeronasal sensory epithelium express G(i2 alpha)- and G(o alpha)-proteins, V1R and V2R vomeronasal receptors, project to the anterior and posterior accessory olfactory bulb and respond to different stimuli, respectively. The extent to which secondary projections from the two portions of the accessory olfactory bulb are convergent in the vomeronasal amygdala is controversial. This issue is addressed by using anterograde and retrograde tract-tracing methods in rats including electron microscopy. Injections of dextran-amines, Fluoro Gold, cholera toxin-B subunit and Fast Blue were delivered to the anterior and posterior accessory olfactory bulb, bed nucleus of the stria terminalis, dorsal anterior amygdala and bed nucleus of the accessory olfactory tract/anteroventral medial amygdaloid nucleus. We have demonstrated that, apart from common vomeronasal-recipient areas, only the anterior accessory olfactory bulb projects to the bed nucleus of the stria terminalis, medial division, posteromedial part, and only the posterior accessory olfactory bulb projects to the dorsal anterior amygdala and deep cell layers of the bed nucleus of the accessory olfactory tract and the anteroventral medial amygdaloid nucleus. These results provide evidence that, excluding areas of convergence, the V1R and V2R vomeronasal pathways project to specific areas of the amygdala. These two vomeronasal subsystems are therefore anatomically and functionally separated in the telencephalon. PMID:17419754

  18. Mineral particles, mineral fibers, and lung cancer

    SciTech Connect

    Churg, A.; Wiggs, B.

    1985-08-01

    The total fibrous and nonfibrous mineral content of the lung has been analyzed in a series of 14 men with lung cancer but no history of occupational dust exposure, and in a series of 14 control men matched for age, smoking history, and general occupational class. The lung cancer patients had an average of 525 +/- 369 X 10(6) exogenous mineral particles and 17.4 +/- 19.6 X 10(6) exogenous mineral fibers/g dry lung, while the controls had averages of 261 +/- 175 mineral particles and 4.7 +/- 3.2 X 10(6) mineral fibers/g dry lung. These differences are statistically significant for both particles and fibers. Kaolinite, talc, mica, feldspars, and crystalline silica comprised the majority of particles of both groups. Approximately 90% of the particles were smaller than 2 micron in diameter and approximately 60% smaller than 1 micron. In both groups, patients who had smoked more than 35 pack years had greater numbers of particles than patients who had smoked less than 35 pack years. It is concluded that, in this study, lungs from patients with lung cancer had statistically greater numbers of mineral particles and fibers than lungs from controls, and that smoking influences total long-term retention of particles from all sources.

  19. [Experimental study of hypoglossal facial anastomosis and accessory-facial anastomosis in guinea pigs].

    PubMed

    Horiuchi, J

    1997-03-01

    Hypoglossal facial nerve anastomosis (XII-VII anastomosis) or accessory-facial anastomosis (XI-VII anastomosis) have been chosen for facial rehabilitation when the facial nerve is widely sacrificed and end-to-end anastomosis or nerve grafting is unavailable. However, no detailed study has been conducted to determine which donor nerve is better for the anastomosis procedure in view of regeneration of the facial nerve. To compare and evaluate nerve regeneration after XII-VII anastomosis and XI-VII anastomosis, animal models of these anastomoses were made in guinea pigs by using a Y-shaped silicon tube. The proximal cut-ends of the hypoglossal nerve and accessory nerve were suspended in the paired inlet limbs of a Y-shaped silicone tube with a 9-0 nylon suture, and the distal cut-end of the facial nerve was suspended in the single outlet limb in a similar manner. After 4 and 8 weeks, histological studies were carried out. An electrophysiological study of conduction velocity and amplitude of evoked electromyography were measured at 8 weeks postoperation. The nerve fibers regenerated from the hypoglossal nerve were significantly more numerous than those from the accessory nerve at both 4 and 8 weeks after anastomosis. The amplitude of evoked electromyography elicited from the hypoglossal nerve was greater than that from the accessory nerve, even though there is no significant difference in conduction velocities between the two anastomoses. The nerve regeneration by the cross-over procedure was influenced by many factors such as the number of nerve fibers in the donor nerve and the affinity between donor and recipient nerves. The number of nerve fibers in the hypoglossal nerve was significantly greater than that in the accessory nerve. However, there was no significant difference in the ratios of regenerated nerve fibers to the preoperative nerve fibers. Accordingly, we concluded that the affinity of the hypoglossal or accessory nerve to the facial nerve is a minor factor if it exists, and the difference in the fiber count in these nerves is a major factor in the outcome of nerve regeneration. PMID:9103842

  20. Minerals in Our Environment

    NSDL National Science Digital Library

    2008-01-01

    Minerals are all around us. They're in our kitchens and bathrooms, our classrooms and school buildings, and our cars and bicycles. This interactive feature lets users discover which minerals are found in items they probably encounter every day. Rolling the cursor over items in an illustrated room accesses pop-ups that describe what mineral products may be found in them. A background essay and list of discussion questions are also provided.

  1. Minerals by Chemical Composition

    NSDL National Science Digital Library

    This interactive periodic table displays a listing of minerals by element, sorted by percent of the element. Clicking on a symbol on the table leads users to information on the element (atomic mass and number, name origin, year of discovery, and a brief description), and to a table listing each mineral known to contain the element in decreasing order by percentage. Each mineral name in the table is linked to additional information on the mineral, such as formula and composition, images, crystallography, physical properties, and many others.

  2. Canadian Minerals Yearbook

    NSDL National Science Digital Library

    2001-01-01

    Part of Natural Resources Canada Minerals and Metals Sector, the Canadian Minerals Yearbook Web site provides mineral industry information from 1994 to 2001. Downloadable files from each year include a Year in Review, Reserves of Selected Major Metals, Recent Production Decisions, and a Mineral and Metal Commodity Review. An example of the information provided comes from the 2001 Review: "In 2000, Canadian reserves of copper, nickel, lead, zinc, molybdenum, silver and gold decreased because there were no decisions to bring new mines into production and the amount of new ore discovered at existing mining operations was insufficient to replace the quantity of ore that was mined during the year."

  3. Acquisition of cell-mediated immunity to Leishmania. II. LSH gene regulation of accessory cell function.

    PubMed Central

    Kaye, P M; Patel, N K; Blackwell, J M

    1988-01-01

    The macrophage natural resistance gene. Lsh, regulates the ability of a selective population of tissue macrophages to control intracellular multiplication of Leishmania donovani by a T-cell independent mechanism. We show here, using mice congenic for Lsh, that this gene also contributes to the acquisition of T-cell-mediated immunity. Whereas both resistant and susceptible mice generate equivalent primary T-cell responses to infection, resistant mice show a rapid increase in accessory cell activity, allowing for greater subsequent T-cell expansion. This change in accessory cell function correlates with increased class II antigen expression relative to susceptible mice, both in vivo during early infection and in vitro in response to induction by interferon-gamma (IFN-gamma). Differences in vitro were independent of, but differentially affected by, amastigote infection. PMID:3141269

  4. A fast 3D reconstruction system with a low-cost camera accessory.

    PubMed

    Zhang, Yiwei; Gibson, Graham M; Hay, Rebecca; Bowman, Richard W; Padgett, Miles J; Edgar, Matthew P

    2015-01-01

    Photometric stereo is a three dimensional (3D) imaging technique that uses multiple 2D images, obtained from a fixed camera perspective, with different illumination directions. Compared to other 3D imaging methods such as geometry modeling and 3D-scanning, it comes with a number of advantages, such as having a simple and efficient reconstruction routine. In this work, we describe a low-cost accessory to a commercial digital single-lens reflex (DSLR) camera system allowing fast reconstruction of 3D objects using photometric stereo. The accessory consists of four white LED lights fixed to the lens of a commercial DSLR camera and a USB programmable controller board to sequentially control the illumination. 3D images are derived for different objects with varying geometric complexity and results are presented, showing a typical height error of <3?mm for a 50?mm sized object. PMID:26057407

  5. Morphology of accessory genital glands of spotted paca (Agouti paca Linnaeus, 1766).

    PubMed

    Borges, Edson Moreira; Branco, Érika; de Lima, Ana Rita; Leal, Leonardo Martins; Martins, Leandro Luiz; Reis, Ana Carolina Gonçalves; Cruz, Claudinei; Machado, Márcia Rita Fernandes; Miglino, Maria Angelica

    2014-02-01

    The spotted paca is the second largest rodent in Brazil, where it is of great economic interest in impoverished regions in view of its prominence as a low-cost source of protein. Little is known about the morphology of the accessory genital glands of this species. Thus, we studied the position and morphology of the genitals in ten adult male spotted pacas. The animals were divided into two groups, five animals were used for fixing of samples in 10% aqueous formaldehyde for macroscopic studies and the other five animals were designated for microscopic analysis. These were arranged in pairs and had the vesicular, prostate, coagulating and bulbourethral glands identified, being structured as mucous glands, which lead into the pelvic urethra. It was concluded that the accessory genital glands found in the paca are the same as those found in most rodents, showing similar histological aspects. PMID:24461579

  6. Gain, preservation, and loss of a group 1a coronavirus accessory glycoprotein.

    PubMed

    Lorusso, Alessio; Decaro, Nicola; Schellen, Pepijn; Rottier, Peter J M; Buonavoglia, Canio; Haijema, Bert-Jan; de Groot, Raoul J

    2008-10-01

    Coronaviruses are positive-strand RNA viruses of extraordinary genetic complexity and diversity. In addition to a common set of genes for replicase and structural proteins, each coronavirus may carry multiple group-specific genes apparently acquired through relatively recent heterologous recombination events. Here we describe an accessory gene, ORF3, unique to canine coronavirus type I (CCoV-I) and characterize its product, glycoprotein gp3. Whereas ORF3 is conserved in CCoV-I, only remnants remain in CCoV-II and CCoV-II-derived porcine and feline coronaviruses. Our findings provide insight into the evolutionary history of coronavirus group 1a and into the dynamics of gain and loss of accessory genes. PMID:18667517

  7. Photosynthetic accessory pigments - Evidence for the influence of phycoerythrin on the submarine light field

    NASA Technical Reports Server (NTRS)

    Hoge, Frank E.; Swift, Robert N.

    1990-01-01

    Upwelled water-leaving spectral radiances and the submarine light-field source are theorized to have the physical scattering and absorption effects of photosynthetic accessory pigments. A laser is employed to induce phycoerythrin pigment fluorescence, and the presence of the photosynthetic accessory pigment is measured in oceanic waters with a spectral fluorescence method. Experimental data from active-passive correlation spectroscopy demonstrate that water-leaving spectral radiances of about 600 nm are highly correlated with phycoerythrin pigment fluorescence. Because the data on the phycoerythrin and chlorophyll fluorescences are entered randomly in the correlation the results are considered unambiguous. An estimate of the photopigment is derived that agrees with measurements of its laser-induced fluorescence.

  8. A fast 3D reconstruction system with a low-cost camera accessory

    PubMed Central

    Zhang, Yiwei; Gibson, Graham M.; Hay, Rebecca; Bowman, Richard W.; Padgett, Miles J.; Edgar, Matthew P.

    2015-01-01

    Photometric stereo is a three dimensional (3D) imaging technique that uses multiple 2D images, obtained from a fixed camera perspective, with different illumination directions. Compared to other 3D imaging methods such as geometry modeling and 3D-scanning, it comes with a number of advantages, such as having a simple and efficient reconstruction routine. In this work, we describe a low-cost accessory to a commercial digital single-lens reflex (DSLR) camera system allowing fast reconstruction of 3D objects using photometric stereo. The accessory consists of four white LED lights fixed to the lens of a commercial DSLR camera and a USB programmable controller board to sequentially control the illumination. 3D images are derived for different objects with varying geometric complexity and results are presented, showing a typical height error of <3?mm for a 50?mm sized object. PMID:26057407

  9. An alternative technique for harvesting marginal liver grafts with a replaced or accessory right hepatic artery.

    PubMed

    Addeo, Pietro; Souche, Regis; Bachellier, Philippe

    2015-07-01

    The presence of a replaced or accessory right hepatic artery (R/A RHA) originating from the superior mesenteric artery represents one of the most common anatomical vascular variants of the hepatic artery and comprises the most frequently injured vessels during liver harvesting. Vascular arterial injuries following liver procurement are associated with decreased patient and graft survival and higher retransplantation rates. We describe an alternative technique for harvesting marginal liver grafts with replaced or accessory right hepatic arteries in the absence of pancreatic procurement. The entire procedure is divided and schematically described in six steps for didactical purposes. This technique has been used in 72 liver harvests over a three-year period with no R/A RHA injury. The technical advantages and limitations of this alternative method are discussed. PMID:25691216

  10. PSC 424: Rocks and Minerals

    NSDL National Science Digital Library

    Ms. Graham

    2011-10-13

    This is a webpage designed to give students access to basic information about rocks and minerals. Rocks and Minerals Introduction Video Basic Definitions- Mineral: a solid inorganic substance of natural occurrence Rock: a mixture of minerals Ways to identify a mineral: Hardness Luster (metallic/nonmetallic) Streak Color Rock Song Three basic rock types: Igneous Metamorphic Sedimentary Rock Cycle Animation ...

  11. Melanopsin and rod-cone photoreceptive systems account for all major accessory visual functions in mice

    Microsoft Academic Search

    S. Hattar; R. J. Lucas; N. Mrosovsky; S. Thompson; R. H. Douglas; M. W. Hankins; J. Lem; M. Biel; F. Hofmann; R. G. Foster; K.-W. Yau

    2003-01-01

    In the mammalian retina, besides the conventional rod-cone system, a melanopsin-associated photoreceptive system exists that conveys photic information for accessory visual functions such as pupillary light reflex and circadian photo-entrainment. On ablation of the melanopsin gene, retinal ganglion cells that normally express melanopsin are no longer intrinsically photosensitive. Furthermore, pupil reflex, light-induced phase delays of the circadian clock and period

  12. Hybrid vehicle powertrain system with power take-off driven vehicle accessory

    DOEpatents

    Beaty, Kevin D.; Bockelmann, Thomas R.; Zou, Zhanijang; Hope, Mark E.; Kang, Xiaosong; Carpenter, Jeffrey L.

    2006-09-12

    A hybrid vehicle powertrain system includes a first prime mover, a first prime mover driven power transmission mechanism having a power take-off adapted to drive a vehicle accessory, and a second prime mover. The second prime mover is operable to drive the power transmission mechanism alone or in combination with the first prime mover to provide power to the power take-off through the power transmission mechanism. The invention further includes methods for operating a hybrid vehicle powertrain system.

  13. Classical torus conformal block, = 2? twisted superpotential and the accessory parameter of Lamé equation

    NASA Astrophysics Data System (ADS)

    Piatek, Marcin

    2014-03-01

    In this work the correspondence between the semiclassical limit of the DOZZ quantum Liouville theory on the torus and the Nekrasov-Shatashvili limit of the = 2? (?-deformed) U(2) super-Yang-Mills theory is used to propose new formulae for the accessory parameter of the Lamé equation. This quantity is in particular crucial for solving the problem of uniformization of the one-punctured torus. The computation of the accessory parameters for torus and sphere is an open longstanding problem which can however be solved if one succeeds to derive an expression for the so-called classical Liouville action. The method of calculation of the latter has been proposed some time ago by Zamolod-chikov brothers. Studying the semiclassical limit of the four-point function of the quantum Liouville theory on the sphere they have derived the classical action for the Riemann sphere with four punctures. In the present work Zamolodchikovs idea is exploited in the case of the Liouville field theory on the torus. It is found that the Lamé accessory parameter is determined by the classical Liouville action on the one-punctured torus or more concretely by the torus classical block evaluated on the saddle point intermediate classical weight. Secondly, as an implication of the aforementioned correspondence it is obtained that the torus accessory parameter is related to the sum of all rescaled column lengths of the so-called "critical" Young diagrams extremizing the instanton "free energy" for the = 2? gauge theory. Finally, it is pointed out that thanks to the known relation the sum over the "critical" column lengths can be expressed in terms of a contour integral in which the integrand is built out of certain special functions.

  14. Isolation of serotonin from the accessory salivary glands of the marine snail Nucella lapillus.

    PubMed

    West, D J; Andrews, E B; McVean, A R; Osborne, D J; Thorndyke, M C

    1994-10-01

    We report here the presence of a bioactive compound in the secretion of the accessory salivary glands (ASGs) of Nucella lapillus. We have purified the compound using HPLC and identified it as serotonin by mass spectrometry, UV spectroscopy, HPLC and capillary electrophoresis. Serotonin was not found in the secretions of the acinous salivary glands or the hypobranchial gland. The amount of serotonin in the secretion of the ASGs does not show seasonal or regional variation. PMID:7846696

  15. Persistent carotid-vertebral anastomosis associated with contralateral accessory middle cerebral artery

    Microsoft Academic Search

    Francesco Briganti; Fabio Tortora; Andrea Elefante; Antonio Volpe; Francesco Maiuri

    2005-01-01

    An exceptional case is reported of a complex anomaly of the brain arteries including low left carotid bifurcation, persistent\\u000a carotid-vertebral anastomosis on the left and accessory middle cerebral artery on the right; the whole posterior circulation\\u000a was only filled through the anomalous anastomotic vessel which joined with the vertebral artery because of a contralateral\\u000a hypoplasic vertebral artery and the absence

  16. Posttraumatic torsion of accessory lobe of the liver and the gallbladder

    Microsoft Academic Search

    Benjamin Z. Koplewitz; David E. Manson; Sigmund H. Ein

    1999-01-01

    Torsion of an accessory lobe of the liver and of the gallbladder is a rare etiology for acute abdominal pain in children\\u000a and infants. We report a case of an 8-year-old girl who was admitted with acute epigastric pain and vomiting, after her brother\\u000a had jumped on her back. Physical examination revealed an afebrile child with a nontender right upper

  17. Two-dimensional speckle tracking imaging as a novel strategy for accurately identifying the accessory pathway.

    PubMed

    Iwayama, Tadateru; Arimoto, Takanori; Tamura, Harutoshi; Wanezaki, Masahiro; Sasaki, Shintaro; Nishiyama, Satoshi; Kutsuzawa, Daisuke; Ishigaki, Daisuke; Nitobe, Joji; Suzuki, Hiroshi; Watanabe, Tetsu; Kubota, Isao

    2014-01-01

    A 14-year-old patient was diagnosed with hypertrophic cardiomyopathy associated with Wolff-Parkinson-White syndrome. The two-dimensional speckle tracking strain method showed normal left ventricular local contraction, but the peak systolic longitudinal strain of the right ventricular (RV) anterior wall was earlier than that of the septal wall. As expected, the location of the accessory pathway was at the RV anterior wall. The patient's RV local contraction was normalized by successful radiofrequency application. PMID:25030566

  18. Projections of the lateral terminal accessory optic nucleus of the common marmoset (Callithrix jacchus).

    PubMed

    Blanks, R H; Clarke, R J; Lui, F; Giolli, R A; Van Pham, S; Torigoe, Y

    1995-04-17

    The connections of the lateral terminal nucleus (LTN) of the accessory optic system (AOS) of the marmoset monkey were studied with anterograde 3H-amino acid light autoradiography and horseradish peroxidase retrograde labeling techniques. Results show a first and largest LTN projection to the pretectal and AOS nuclei including the ipsilateral nucleus of the optic tract, dorsal terminal nucleus, and interstitial nucleus of the superior fasciculus (posterior fibers); smaller contralateral projections are to the olivary pretectal nucleus, dorsal terminal nucleus, and LTN. A second, major bundle produces moderate-to-heavy labeling in all ipsilateral, accessory oculomotor nuclei (nucleus of posterior commissure, interstitial nucleus of Cajal, nucleus of Darkschewitsch) and nucleus of Bechterew; some of the fibers are distributed above the caudal oculomotor complex within the supraoculomotor periaqueductal gray. A third projection is ipsilateral to the pontine and mesencephalic reticular formations, nucleus reticularis tegmenti pontis and basilar pontine complex (dorsolateral nucleus only), dorsal parts of the medial terminal accessory optic nucleus, ventral tegmental area of Tsai, and rostral interstitial nucleus of the medial longitudinal fasciculus. Lastly, there are two long descending bundles: (1) one travels within the medial longitudinal fasciculus to terminate in the dorsal cap (ipsilateral > contralateral) and medial accessory olive (ipsilateral only) of the inferior olivary complex. (2) The second soon splits, sending axons within the ipsilateral and contralateral brachium conjunctivum and is distributed to the superior and medial vestibular nuclei. The present findings are in general agreement with the documented connections of LTN with brainstem oculomotor centers in other species. In addition, there are unique connections in marmoset monkey that may have developed to serve the more complex oculomotor behavior of nonhuman primates. PMID:7608336

  19. Accessory Pancreatic Duct-Portal Vein Fistula: A Rare Complication of Chronic Pancreatitis during Endoscopic Retrograde Cholangiopancreatography

    PubMed Central

    Kawaguchi, Yoshiaki; Lin, Jung-Chun; Kawashima, Yohei; Maruno, Atsuko; Ito, Hiroyuki; Ogawa, Masami; Mine, Tetsuya

    2014-01-01

    Pancreatitis, hemorrhage and perforation are the most frequent complications associated with endoscopic retrograde cholangiopancreatography (ERCP). We report a rare case of accessory pancreatic duct-portal vein fistula, which occurred during ERCP in a patient with chronic pancreatitis. To our knowledge, this is the first report of accessory pancreatic duct-portal vein fistula created during ERCP by the use of a guide wire. PMID:25473386

  20. Pan-genome sequence analysis using Panseq: an online tool for the rapid analysis of core and accessory genomic regions

    Microsoft Academic Search

    Chad Laing; Cody Buchanan; Eduardo N. Taboada; Yongxiang Zhang; Andrew Kropinski; Andre Villegas; James E. Thomas; Victor P. J. Gannon

    2010-01-01

    BACKGROUND: The pan-genome of a bacterial species consists of a core and an accessory gene pool. The accessory genome is thought to be an important source of genetic variability in bacterial populations and is gained through lateral gene transfer, allowing subpopulations of bacteria to better adapt to specific niches. Low-cost and high-throughput sequencing platforms have created an exponential increase in

  1. The core and accessory genomes of Burkholderia pseudomallei: implications for human melioidosis.

    PubMed

    Sim, Siew Hoon; Yu, Yiting; Lin, Chi Ho; Karuturi, R Krishna M; Wuthiekanun, Vanaporn; Tuanyok, Apichai; Chua, Hui Hoon; Ong, Catherine; Paramalingam, Sivalingam Suppiah; Tan, Gladys; Tang, Lynn; Lau, Gary; Ooi, Eng Eong; Woods, Donald; Feil, Edward; Peacock, Sharon J; Tan, Patrick

    2008-10-01

    Natural isolates of Burkholderia pseudomallei (Bp), the causative agent of melioidosis, can exhibit significant ecological flexibility that is likely reflective of a dynamic genome. Using whole-genome Bp microarrays, we examined patterns of gene presence and absence across 94 South East Asian strains isolated from a variety of clinical, environmental, or animal sources. 86% of the Bp K96243 reference genome was common to all the strains representing the Bp "core genome", comprising genes largely involved in essential functions (eg amino acid metabolism, protein translation). In contrast, 14% of the K96243 genome was variably present across the isolates. This Bp accessory genome encompassed multiple genomic islands (GIs), paralogous genes, and insertions/deletions, including three distinct lipopolysaccharide (LPS)-related gene clusters. Strikingly, strains recovered from cases of human melioidosis clustered on a tree based on accessory gene content, and were significantly more likely to harbor certain GIs compared to animal and environmental isolates. Consistent with the inference that the GIs may contribute to pathogenesis, experimental mutation of BPSS2053, a GI gene, reduced microbial adherence to human epithelial cells. Our results suggest that the Bp accessory genome is likely to play an important role in microbial adaptation and virulence. PMID:18927621

  2. The Core and Accessory Genomes of Burkholderia pseudomallei: Implications for Human Melioidosis

    PubMed Central

    Lin, Chi Ho; Karuturi, R. Krishna M.; Wuthiekanun, Vanaporn; Tuanyok, Apichai; Chua, Hui Hoon; Ong, Catherine; Paramalingam, Sivalingam Suppiah; Tan, Gladys; Tang, Lynn; Lau, Gary; Ooi, Eng Eong; Woods, Donald; Feil, Edward; Peacock, Sharon J.; Tan, Patrick

    2008-01-01

    Natural isolates of Burkholderia pseudomallei (Bp), the causative agent of melioidosis, can exhibit significant ecological flexibility that is likely reflective of a dynamic genome. Using whole-genome Bp microarrays, we examined patterns of gene presence and absence across 94 South East Asian strains isolated from a variety of clinical, environmental, or animal sources. 86% of the Bp K96243 reference genome was common to all the strains representing the Bp “core genome”, comprising genes largely involved in essential functions (eg amino acid metabolism, protein translation). In contrast, 14% of the K96243 genome was variably present across the isolates. This Bp accessory genome encompassed multiple genomic islands (GIs), paralogous genes, and insertions/deletions, including three distinct lipopolysaccharide (LPS)-related gene clusters. Strikingly, strains recovered from cases of human melioidosis clustered on a tree based on accessory gene content, and were significantly more likely to harbor certain GIs compared to animal and environmental isolates. Consistent with the inference that the GIs may contribute to pathogenesis, experimental mutation of BPSS2053, a GI gene, reduced microbial adherence to human epithelial cells. Our results suggest that the Bp accessory genome is likely to play an important role in microbial adaptation and virulence. PMID:18927621

  3. G protein-coupled receptor accessory proteins and signaling: pharmacogenomic insights.

    PubMed

    Thompson, Miles D; Cole, David E C; Jose, Pedro A; Chidiac, Peter

    2014-01-01

    The identification and characterization of the genes encoding G protein-coupled receptors (GPCRs) and the proteins necessary for the processes of ligand binding, GPCR activation, inactivation, and receptor trafficking to the membrane are discussed in the context of human genetic disease. In addition to functional GPCR variants, the identification of genetic disruptions affecting proteins necessary to GPCR functions have provided insights into the function of these pathways. Gs? and G? subunit polymorphisms have been found to result in complex phenotypes. Disruptions in accessory proteins that normally modify or organize heterotrimeric G-protein coupling may also result in disease states. These include the contribution of variants of the regulator of G protein signaling (RGS) protein to hypertension; the role variants of the activator of G protein signaling (AGS) proteins to phenotypes (such as the type III AGS8 variant to hypoxia); the contribution of G protein-coupled receptor kinase (GRK) proteins, such as GRK4, in disorders such as hypertension. The role of accessory proteins in GPCR structure and function is discussed in the context of genetic disorders associated with disruption of the genes that encode them. An understanding of the pharmacogenomics of GPCR and accessory protein signaling provides the basis for examining both GPCR pharmacogenetics and the genetics of monogenic disorders that result from disruption of given receptor systems. PMID:25150869

  4. Vitamin and mineral requirements

    E-print Network

    Laughlin, Robert B.

    Vitamin and mineral requirements in human nutrition Second edition Please go to the Table and mineral requirements in human nutrition : report of a joint FAO/WHO expert consultation, Bangkok, Thailand REQUIREMENTS IN HUMAN NUTRITION iv 2.2.4 Risk factors 22 2.2.5 Morbidity and mortality 23 2.3 Units

  5. Rocks and Minerals

    NSDL National Science Digital Library

    This description of rocks and minerals includes representatives of all three major groups: igneous, sedimentary, and metamorphic. Users can access introductory information about the three major rock types and the minerals that form them. A simple rock classification chart is included, with embedded links to a glossary and more detailed material for advanced learners.

  6. Vitamins, Minerals, and Mood

    ERIC Educational Resources Information Center

    Kaplan, Bonnie J.; Crawford, Susan G.; Field, Catherine J.; Simpson, J. Steven A.

    2007-01-01

    In this article, the authors explore the breadth and depth of published research linking dietary vitamins and minerals (micronutrients) to mood. Since the 1920s, there have been many studies on individual vitamins (especially B vitamins and Vitamins C, D, and E), minerals (calcium, chromium, iron, magnesium, zinc, and selenium), and vitamin-like…

  7. Minerals, Crystals and Gems

    NSDL National Science Digital Library

    This module introduces students to minerals, crystals, and gems by using pictures and discussions of some of the extraordinary specimens residing in the collections of the Smithsonian Institution. It includes three lessons in which they draw pictures of specimens, grow their own crystals of magnesium sulfate, and perform a scavenger hunt in which they look for minerals in commonly used objects and products.

  8. Minerals in Our Environment

    NSDL National Science Digital Library

    Frank, Dave

    This color poster shows how we use minerals in our everyday life. It depicts common household items (furniture, appliances, plumbing fixtures, personal products, etc.) which are keyed by number to short descriptions that provide information on the minerals used in the manufacture of these items.

  9. VITAMINS AND MINERALS

    NSDL National Science Digital Library

    Mr. Hughes

    2006-03-05

    DESK Standard: Specify key vitamins and minerals and their functions. . DATES: You can begin this activity on May 21. You should complete it by May 25. OBJECTIVE: A healthy body needs vitamins and minerals. You\\'ve probably heard these words before, but do you really know what they mean? This activity will help you better understand the ...

  10. Anatomic and electrophysiologic relation between the coronary sinus and mitral annulus: implications for ablation of left-sided accessory pathways.

    PubMed

    Shinbane, J S; Lesh, M D; Stevenson, W G; Klitzner, T S; Natterson, P D; Wiener, I; Ursell, P C; Saxon, L A

    1998-01-01

    To determine whether precise left-sided accessory pathway localization is possible from the coronary sinus, electrocardiogram (ECG) characteristics from the coronary sinus pair demonstrating earliest activation via the accessory pathway were compared to simultaneous mitral annular ablation catheter ECGs at successful ablation sites in 48 patients. To define the coronary sinus-mitral annular relation, the coronary sinus to mitral annulus distance (D) was measured at sequential distances from the coronary sinus os in 10 cadaver hearts. Mitral annular ECGs demonstrated earliest activation via the accessory pathway more frequently than the earliest coronary sinus pair (p < 0.001), more frequent continuous electrical activity (p < 0.001), and more frequent accessory pathway potentials (p < 0.01). D was >10 mm at 20, 40, and 60 mm, respectively, from the coronary sinus os. Coronary sinus ECGs do not precisely localize left-sided accessory pathways, which may be due in part to an average anatomic separation of more than 10 mm between the coronary sinus and accessory pathways bridging the mitral annulus. PMID:9453527

  11. Sc- and REE-bearing ixiolite and associated minerals from the Sosedka pegmatite vein in the Malkhan pegmatite field, central Transbaikal region

    NASA Astrophysics Data System (ADS)

    Badanina, E. V.; Gordienko, V. V.; Wiechowski, A.; Friedrich, G.

    2008-12-01

    Composition and localization of REE mineralization in miarolitic pegmatites and its role in the pegmatite formation were studied at the Malkhan gem deposit (jewel-quality tourmaline, morganite, danburite, and hambergite) in the central Transbaikal region. The chemical composition of Ti-, Ta-, Nb- and REE-bearing minerals, their relationships with rock-forming and accessory minerals indicate that two geochemically specialized stages of pegmatite formation are distinguished. The early stage gave rise to the crystallization of quartz-feldspar aggregates including K-feldspar block zone with Sc and REE mineralization. The rare-metal (Li, Cs, F, B, Be) albite-lepidolite-cleavelandite complex with pockets of gem mineralization was formed at the late stage.

  12. USGS: Energy & Minerals

    NSDL National Science Digital Library

    2013-06-20

    The Energy and Minerals Mission Area of the United States Geological Survey (USGS) "conducts research and assessments on the location, quantity, and quality of material and energy resources, including the economic and environmental effects of resource extraction and use." Visitors to the site can click on thematic sections such as Energy Resources and Mineral Resources. Each of these areas contains information about each program, along with fact sheets, databases, and detailed geospatial maps. The Program News area contains links to documents such as "Understanding the Global Distribution of Nonfuel Mineral Resources" and a host of summary documents on mineral commodities. Finally, the site is rounded out by the Mineral Resources Products area. Here, visitors can look into hundreds of statistical reports, bulletins, and data sets intended for scientists, journalists, and members of the general public.

  13. Why Mineral Interfaces Matter

    NASA Astrophysics Data System (ADS)

    Putnis, Andrew; Putnis, Christine V.

    2015-04-01

    While it is obvious that reactions between a mineral and an aqueous solution take place at the mineral-fluid interface it is only relatively recently that high spatial resolution studies have demonstrated how the local structure of the mineral surface and the chemical composition of the fluid at the interface control both the short-range and the long-range consequences of mineral-fluid interaction. Long-range consequences of fluid-mineral interaction control element cycles in the earth, the formation of ore-deposits, the chemical composition of the oceans through weathering of rocks and hence climate changes. Although weathering is clearly related to mineral dissolution, to what extent do experimentally measured dissolution rates of minerals help to understand weathering, especially weathering mechanisms? This question is related to the short-range, local reactions that take place when a mineral, that is not stable in the fluid, begins to dissolve. In this case the fluid composition at the interface will become supersaturated with respect to a different phase or phases. This may be a different composition of the same mineral e.g. a Ca-rich feldspar dissolving in a Na-rich solution results in a fluid at the interface which may be supersaturated with respect to an Na-rich feldspar. Alternatively, the interfacial fluid could be supersaturated with respect to a different mineral e.g. an Na-rich zeolite, depending on the temperature. Numerous experiments have shown that the precipitation of a more stable phase at the mineral-fluid interface results in a coupling between the dissolution and the precipitation, and the replacement of one mineral by another. This process separates the short-range mechanisms which depend only on the composition of the interfacial solution, and the long-range consequences that depend on the composition of the residual fluid released from the reacting parent mineral. Typically such residual fluids may carry metal ions tens to hundreds of kilometres from the initial reaction site to form ore deposits. The coupling of dissolution and precipitation has important consequences for all reactions between fluids and rocks and understanding this coupling has applications well beyond mineralogy, for example, in developing new methods of materials synthesis, for carbon removal from the atmosphere and for safe storage of nuclear waste.

  14. Mineral facilities of Europe

    USGS Publications Warehouse

    Almanzar, Francisco; Baker, Michael S.; Elias, Nurudeen; Guzman, Eric

    2010-01-01

    This map displays over 1,700 records of mineral facilities within the countries of Europe and western Eurasia. Each record represents one commodity and one facility type at a single geographic location. Facility types include mines, oil and gas fields, and plants, such as refineries, smelters, and mills. Common commodities of interest include aluminum, cement, coal, copper, gold, iron and steel, lead, nickel, petroleum, salt, silver, and zinc. Records include attributes, such as commodity, country, location, company name, facility type and capacity (if applicable), and latitude and longitude geographical coordinates (in both degrees-minutes-seconds and decimal degrees). The data shown on this map and in table 1 were compiled from multiple sources, including (1) the most recently available data from the U.S. Geological Survey (USGS) Minerals Yearbook (Europe and Central Eurasia volume), (2) mineral statistics and information from the USGS Minerals Information Web site (http://minerals.usgs.gov/minerals/pubs/country/europe.html), and (3) data collected by the USGS minerals information country specialists from sources, such as statistical publications of individual countries, annual reports and press releases of operating companies, and trade journals. Data reflect the most recently published table of industry structure for each country at the time of this publication. Additional information is available from the country specialists listed in table 2.

  15. Mineralogy and temporal relations of coexisting authigenic minerals in altered silicic tuffs and their utility as potential low-temperature dateable minerals

    NASA Astrophysics Data System (ADS)

    WoldeGabriel, Giday; Broxton, David E.; Byers, Frank M.

    1996-05-01

    Coexisting fine-grained (0.1-20 ?m) authigenic silicate minerals separated from altered tuffs in Miocene and Plio-Pleistocene lacustrine deposits were characterized petrographically and using X-ray powder diffraction. The authigenic minerals are dominated by clinoptilolite, erionite, phillipsite, K-feldspar, silica, calcite, smectite, and randomly interstratified illite/smectite. Minor accessories of opal-CT, cristobalite, and barite are present with the major alteration minerals. Authigenic minerals from altered tuffs were dated using the {K}/{Ar} method to evaluate the utility of these minerals for determining the time of alteration in low-temperature diagenetic environments. The eruption ages of some of these zeolite-rich tuffs were determined using the {40Ar }/{39Ar } method on single sanidine and plagioclase minerals. The {K}/{Ar} isotopic ages of the fine-grained K-feldspar show minimal variation compared with results from the clinoptilolite separates. The isotopic ages from the authigenic K-feldspar (15-13.8 Ma) and some of the zeolites (16.-6.7 Ma) are similar to the eruption ages of the tuffs and indicate early alteration. Despite their open-framework structure, zeolites apparently can retain part or all of their radiogenic argon under favorable conditions (e.g., saturated environment). How much of the radiogenic argon is retained is estimated from the isotopic ages of other coexisting secondary minerals that are commonly dated by the {K}/{Ar} method. Although zeolite isotopic ages should be interpreted with caution, they may be useful to constrain temporal relations of low-temperature diagenetic processes when used in conjunction with other dateable minerals.

  16. Private Mineral Gallery Walk

    NSDL National Science Digital Library

    Dexter Perkins

    Students make and display posters of the mineral they researched throughout the semester. The instructor and TA review the posters while students answer questions as they walk around and examine each other's posters.

  17. Biological effects of minerals

    SciTech Connect

    Guthrie, G.D. Jr.

    1991-09-01

    In general, clay materials exhibit a range of biological activities, from apparently inactive or slightly active, such as hematite, to highly fibrogenic and carcinogenic, such as fibrous brucite (nemalite). The zeolites also exhibit such as range, with some mordenite being slightly active and erionite being highly active; however, erionite is the only zeolite that has been studied extensively. The diversity of mineral species holds great potential for probing these mechanisms, especially when mineralogical data are integrated with biological data. Unfortunately, many of the studies reporting data on the biological effects of clays and zeolites fail to report detailed mineralogical information; hence, it is difficult at present to interpret the biological activities of minerals in terms of their physical and chemical properties. Important mineralogical data that are only rarely considered in biological research include exact mineralogy of the specimen (i.e., identification and abundance of contaminants), physical and chemical properties of minerals, and surface properties of minerals. 141 refs., 1 fig., 8 tabs.

  18. Ken's Fluorescent Minerals

    NSDL National Science Digital Library

    Kenneth Colosky

    This web site provides photos of fluorescent minerals photographed under long wave (LW) or short wave (SW) ultraviolet light. Links to additional resources, and a list of books and information sources are also included.

  19. Minerals Yearbook, 1988. Boron

    SciTech Connect

    Lyday, P.A.

    1988-01-01

    U.S. production and sales of boron minerals and chemicals decreased during the year. Glass-fiber insulation was the largest use for borates, followed by sales to distributors, textile-grade glass fibers, and borosilicate glasses. California was the only domestic source of boron minerals. The report discusses the following: domestic data coverage; legislation and government programs; domestic production; comsumption and uses; prices; foreign trade; world capacity; world review--Argentina, Chile, France, Italy, Turkey, United Kingdom; Technology.

  20. Fluorescent minerals, a review

    USGS Publications Warehouse

    Modreski, P.J.; Aumente-Modreski, R.

    1996-01-01

    Fluorescent minerals are more than just an attractive novelty, and collecting them is a speciality for thousands of individuals who appreciate their beauty, rarity, and scientific value. Fluorescent properties can be used as an aid to mineral identification, locality determination, and distinction between natural and synthetic gemstones. This article gives an overview of those aspects of fluorescence that are of most interest to collectors, hobbyists, and mineralogists. -from Authors

  1. Ice is a Mineral

    NSDL National Science Digital Library

    This is a lesson about the characteristics of ice as a mineral and how it compares to other minerals with respect to hardness. Learners will observe ice crystals, develop a hardness scale and position ice on it. Learners will also practice working collaboratively in a team. Activities include small group miming, speaking, drawing, and/or writing. This is lesson 3 of 12 in the unit, Exploring Ice in the Solar System.

  2. Mineral Wool Insulation Binders

    Microsoft Academic Search

    Stefan Kowatsch

    2010-01-01

    \\u000a Mineral wool is considered the best known insulation type among the wide variety of insulation materials. There are three\\u000a types of mineral wool, and these consist of glass, stone (rock), and slag wool. The overall manufacturing processes, along\\u000a with features such as specifications and characteristics for each of these types, as well as the role of the binder within\\u000a the

  3. Mineral impurities in coal combustion

    Microsoft Academic Search

    Raask

    1985-01-01

    This article discusses the many and varied problems associated with coal combustion and suggests remedial measures to assist in producing electrical energy from coal more efficiently. Contents include: influence of coal mineral matter on boiler design; mineral impurities in coal; quality of coal utilized in power stations; coal grinding, abrasive fuel minerals and plant wear; particulates silicate minerals in boiler

  4. Mineral Physical Properties and Identification

    NSDL National Science Digital Library

    Richard Harwood

    2011-01-01

    This Physical Geology 101 lab consists of a chart which defines the physical properties and provides the means for determining the physical property of a mineral sample. Also presented is a table listing some of the aspects of the common lab minerals. Armed with an image of a mineral and a series of physical properties tests, students are asked to identify each mineral.

  5. Measuring the Hardness of Minerals

    ERIC Educational Resources Information Center

    Bushby, Jessica

    2005-01-01

    The author discusses Moh's hardness scale, a comparative scale for minerals, whereby the softest mineral (talc) is placed at 1 and the hardest mineral (diamond) is placed at 10, with all other minerals ordered in between, according to their hardness. Development history of the scale is outlined, as well as a description of how the scale is used…

  6. Ultrastructure of the principal and accessory submandibular glands of the common vampire bat.

    PubMed

    Tandler, B; Toyoshima, K; Phillips, C J

    1990-12-01

    The principal and accessory submandibular glands of the common vampire bat, Desmodus rotundus, were examined by electron microscopy. The secretory endpieces of the principal gland consist of serous tubules capped at their blind ends by mucous acini. The substructure of the mucous droplets and of the serous granules varies according to the mode of specimen preparation. With ferrocyanide-reduced osmium postfixation, the mucous droplets are moderately dense and homogeneous; the serous granules often have a polygonal outline and their matrix shows clefts in which bundles of wavy filaments may be present. With conventional osmium postfixation, the mucous droplets have a finely fibrillogranular matrix; the serous granules are homogeneously dense. Mucous cells additionally contain many small, dense granules that may be small peroxisomes, as well as aggregates of 10-nm cytofilaments. Intercalated duct cells are relatively unspecialized. Striated ducts are characterized by highly folded basal membranes and vertically oriented mitochondria. Luminal surfaces of all of the secretory and duct cells have numerous microvilli, culminating in a brush borderlike affair in the striated ducts. The accessory gland has secretory endpieces consisting of mucous acini with small mucous demilunes. The acinar mucous droplets contain a large dense region; the lucent portion has punctate densities. Demilune mucous droplets lack a dense region and consist of a light matrix in which fine fibrillogranular material is suspended. A ring of junctional cells, identifiable by their complex secretory granules, separates the mucous acini from the intercalated ducts. The intercalated ducts lack specialized structure. Striated ducts resemble their counterparts in the principal gland. As in the principal gland, all luminal surfaces are covered by an array of microvilli. At least some of the features of the principal and accessory submandibular glands of the vampire bat may be structural adaptations to the exigencies posed by the exclusively sanguivorous diet of these animals and its attendant extremely high intake of sodium chloride. PMID:2285039

  7. The B. subtilis Accessory Helicase PcrA Facilitates DNA Replication through Transcription Units.

    PubMed

    Merrikh, Christopher N; Brewer, Bonita J; Merrikh, Houra

    2015-06-01

    In bacteria the concurrence of DNA replication and transcription leads to potentially deleterious encounters between the two machineries, which can occur in either the head-on (lagging strand genes) or co-directional (leading strand genes) orientations. These conflicts lead to replication fork stalling and can destabilize the genome. Both eukaryotic and prokaryotic cells possess resolution factors that reduce the severity of these encounters. Though Escherichia coli accessory helicases have been implicated in the mitigation of head-on conflicts, direct evidence of these proteins mitigating co-directional conflicts is lacking. Furthermore, the endogenous chromosomal regions where these helicases act, and the mechanism of recruitment, have not been identified. We show that the essential Bacillus subtilis accessory helicase PcrA aids replication progression through protein coding genes of both head-on and co-directional orientations, as well as rRNA and tRNA genes. ChIP-Seq experiments show that co-directional conflicts at highly transcribed rRNA, tRNA, and head-on protein coding genes are major targets of PcrA activity on the chromosome. Partial depletion of PcrA renders cells extremely sensitive to head-on conflicts, linking the essential function of PcrA to conflict resolution. Furthermore, ablating PcrA's ATPase/helicase activity simultaneously increases its association with conflict regions, while incapacitating its ability to mitigate conflicts, and leads to cell death. In contrast, disruption of PcrA's C-terminal RNA polymerase interaction domain does not impact its ability to mitigate conflicts between replication and transcription, its association with conflict regions, or cell survival. Altogether, this work establishes PcrA as an essential factor involved in mitigating transcription-replication conflicts and identifies chromosomal regions where it routinely acts. As both conflicts and accessory helicases are found in all domains of life, these results are broadly relevant. PMID:26070154

  8. The B. subtilis Accessory Helicase PcrA Facilitates DNA Replication through Transcription Units

    PubMed Central

    Merrikh, Christopher N.; Brewer, Bonita J.; Merrikh, Houra

    2015-01-01

    In bacteria the concurrence of DNA replication and transcription leads to potentially deleterious encounters between the two machineries, which can occur in either the head-on (lagging strand genes) or co-directional (leading strand genes) orientations. These conflicts lead to replication fork stalling and can destabilize the genome. Both eukaryotic and prokaryotic cells possess resolution factors that reduce the severity of these encounters. Though Escherichia coli accessory helicases have been implicated in the mitigation of head-on conflicts, direct evidence of these proteins mitigating co-directional conflicts is lacking. Furthermore, the endogenous chromosomal regions where these helicases act, and the mechanism of recruitment, have not been identified. We show that the essential Bacillus subtilis accessory helicase PcrA aids replication progression through protein coding genes of both head-on and co-directional orientations, as well as rRNA and tRNA genes. ChIP-Seq experiments show that co-directional conflicts at highly transcribed rRNA, tRNA, and head-on protein coding genes are major targets of PcrA activity on the chromosome. Partial depletion of PcrA renders cells extremely sensitive to head-on conflicts, linking the essential function of PcrA to conflict resolution. Furthermore, ablating PcrA’s ATPase/helicase activity simultaneously increases its association with conflict regions, while incapacitating its ability to mitigate conflicts, and leads to cell death. In contrast, disruption of PcrA’s C-terminal RNA polymerase interaction domain does not impact its ability to mitigate conflicts between replication and transcription, its association with conflict regions, or cell survival. Altogether, this work establishes PcrA as an essential factor involved in mitigating transcription-replication conflicts and identifies chromosomal regions where it routinely acts. As both conflicts and accessory helicases are found in all domains of life, these results are broadly relevant. PMID:26070154

  9. Entrainment of circus movement tachycardia utilizing an accessory pathway with long retrograde conduction times during ventricular and atrial stimulation.

    PubMed

    Castellanos, A; Portillo, B; Mejias, J; Leon-Portillo, N; Saoudi, N C; Zaman, L

    1985-12-01

    An unusual case is presented in which a circus movement tachycardia incorporating an accessory pathway with long retrograde conduction time was transiently entrained. Overdrive high right atrial stimulation produced entrainment without atrial fusion since collision of anterograde and retrograde impulses took place within the accessory pathway. Tachycardia termination occurred when, at a faster pacing rate, an atrial impulse that collided in the accessory pathway was blocked at the atrioventricular (AV) node. In contrast, the entrainment seen during right ventricular apical stimulation was characterized by the occurrence of both fusion and collision within the ventricles. The tachycardia was terminated when a pure paced impulse that collided in the normal pathway was blocked in a retrograde direction in the accessory pathway. These data indicate that: 1) transient entrainment of this arrhythmia (circus movement tachycardia) can be identified by the classical criteria used to diagnose it, provided that fusion and collision occur within the ventricles; and 2) the accessory pathway is the weak link for tachycardia termination only during ventricular pacing since the AV node is the weak link during atrial stimulation. PMID:4067125

  10. Technetium-99m-HIDA visualization of an obstructed gallbladder via an accessory hepatic duct

    SciTech Connect

    Reimer, D.E.; Donald, J.W.

    1981-09-01

    Technetium-99m-labeled iminodiacetic acid (HIDA) and paraisopropyliminodiacetic acid (PIPIDA) scintigraphy after sonographic evaluation of the gallbladder have been advocated recently for the diagnosis of acute obstructive cholecystitis and cholelithiasis. Several authors have stated or inferred that gallbladder visualization with /sup 99m/Tc-HIDA excludes acute cholecystitis and cystic duct obstruction. We describe a patient with surgically proven cystic duct obstruction whose gallbladder visualized on a /sup 99m/Tc-HIDA scan via an accessory hepatic duct which directly entered the gallbladder.

  11. Robotic resection of dual accessory mitral valve tissue in an adult patient.

    PubMed

    Yamaguchi, Shojiro; Ishikawa, Norihiko; Tomita, Shigeyuki; Ohtake, Hiroshi; Kiuchi, Ryuta; Nishida, Yuji; Muramatsu, Kenichi; Watanabe, Go

    2014-09-01

    The presence of isolated accessory mitral valve tissue (AMVT) is extremely rare in adults. We successfully performed robot-assisted resection of dual AMVT that was attached to the papillary muscle and anterior mitral leaflet. Echocardiography was invaluable for identifying the most suitable approach. The short-axis view on echocardiography revealed the precise location where the AMVT was attached. The robotic operation enabled fine visualization; we clearly observed the AMVT and removed its entire extra structure. The patient recovered well and was discharged 3 days after the operation. To the best of our knowledge, this is the first report of successful robotic AMVT resection. PMID:25193197

  12. The IMA Commission on New Minerals and Mineral Names: procedures and guidelines on mineral nomenclature, 1998

    Microsoft Academic Search

    E. H. Nickel; J. D. Grice

    1998-01-01

    Summary An author wishing to introduce a new mineral name into the literature, or to redefine, discredit or rename an existing mineral, must obtain prior approval of the IMA Commission on New Minerals and Mineral Names. This paper outlines the procedure to be followed in the preparation and submission of a proposal for approval, and describes how such proposals are

  13. Mineral hydrolysis kinetics

    SciTech Connect

    Westrich, H.R.; Cygan, R.T.; Arnold, G.W. [Sandia National Labs., Albuquerque, NM (United States); Casey, W.H. [California Univ., Davis, CA (United States). Dept. of Land, Air, and Water Resources

    1993-07-01

    Dissolution rate laws for silicate mineral weathering can be related to kinetics of ligand-exchange reactions. This relation is being tested with an experimental/analytical/theoretical program for measuring the dissolution kinetics of orthosilicate minerals for use in ionic modeling and molecular dynamics computer simulations of solid, aqueous solution, and solid/liquid interface. To date, dissolution rate have been measured for a suite of endmember and mixed-cation orthosilicate minerals (both olivine and willemite structures) as well as a few inosilicate minerals (pyroxenes). Dissolution rates appear to correlate well with solvent exchange rates around the hydrated divalent cations. Siloxane (Si-O-Si) bonds are relatively unreactive at low pH`s close to zero point of neutral charge for quartz. The correlation suggests that silicic acid would be released from the reacting surfaces after protonation and hydration of bonds between divalent metals and structural oxygens; congruent dissolution is confirmed by Rutherford backscattered analysis of the near-surface of an acid-reacted forsterite. In the ionic modeling, except for liebenbergite, there is a general trend of increasing lattice energy with decreasing dissolution rate for endmember and mixed-cation orthosilicate minerals at pH 2. 3 figs, 4 refs.

  14. The JMU Mineral Museum - Observing Physical Properties of Minerals

    NSDL National Science Digital Library

    Cynthia A. Kearns

    Mineral museums provide a resourse for students to explore beautiful examples of minerals. During the exploration process, they can also apply or reinforce visual observation skills they have learned in lab. The James Madison University Mineral Museum (http://csm.jmu.edu/minerals/) provides educational opportunities for both introductory geology and earth science courses as well as advanced major. In this exercise, students have possibly their first opportunity to enjoy the wonderous world of minerals in an exhilerating display. During the exploration process, students are provided a reinforcment of visual observation skills previously experienced in lab and an introduction to mineral names and classifications.

  15. Accessory and main olfactory systems influences on predator odor-induced behavioral and endocrine stress responses in rats

    PubMed Central

    Masini, Cher V.; Garcia, Robert J.; Sasse, Sarah K.; Nyhuis, Tara J.; Day, Heidi E.W.; Campeau, Serge

    2009-01-01

    Exposures to predator odors are very effective methods to evoke a variety of stress responses in rodents. We have previously found that ferret odor exposure leads to changes in endocrine hormones (corticosterone and ACTH) and behavior. To distinguish the contributions of the main and accessory olfactory systems in these responses, studies were designed to interfere with these two systems either independently, or simultaneously. Male Sprague-Dawley rats were treated with 10% zinc sulfate (ZnSO4), which renders rodents anosmic (unable to smell) while leaving the accessory olfactory areas intact, or saline, in experiment 1. In experiment 2, the vomeronasal organs of rats were surgically removed (VNX) to block accessory olfactory processing, while leaving the main olfactory system intact. And in the 3rd experiment both the main and accessory olfactory areas were disrupted by combining the two procedures in the same rats. Neither ZnSO4 treatment or VNX alone reliably reduced the increased corticosterone response to ferret odor compared to strawberry odor, but in combination, they did. This suggests that processing through the main or the accessory olfactory system can elicit the endocrine stress response to ferret odor. VNX alone also did not affect the behavioral responses to the ferret. ZnSO4 treatment, alone and in combination with VNX, led to changes in behavior in response to both ferret and strawberry odor, making the behavioral results less clearly interpretable. Overall these studies suggest that both the main and accessory olfactory systems mediate the neuroendocrine response to predator odor. PMID:19800371

  16. Ascaris lumbricoides and its invasion of the accessory cystic duct: an unusual presentation.

    PubMed

    Majid, Zain; Masood, Irfan; Pirzada, Muhammad Taqi

    2015-04-01

    Around the world, Ascaris lumbricoides is the most common helminthic infection. We describe the case of a 25-year-old woman, known to have had Ascaris infestation, presenting with abdominal pain, constipation and jaundice together with fever and tachycardia. There was tenderness in the right hypochondrium and liver function tests confirmed cholestatic jaundice. An abdominal ultrasound showed multiple linear echogenic foci in the distal small intestine along with cholelithiasis and a thick-walled gall bladder with a single stone compressing the common bile duct (Mirizzi syndrome). The patient underwent exploratory laparotomy; more than 100 worms were found inside the small intestine and they were removed by enterotomy and manual decompression. No worm could be palpated within the common bile duct (CBD). Cholecystectomy was performed, during which an accessory cystic duct was noted opening into the common bile duct superiorly to the main cystic duct. A 10?cm live worm was found coming out of it and was removed via forceps. Later on an endoscopic retrograde cholangio-pancreatogram (ERCP) showed a widened ampulla, a mildly dilated common bile duct, but without any filling defects. The patient made an uneventful postoperative recovery being discharged on the ninth day. Worms in an accessory cystic duct have not been report in the medical literature so far. PMID:25430551

  17. Burkholderia pseudomallei sequencing identifies genomic clades with distinct recombination, accessory, and epigenetic profiles

    PubMed Central

    Nandi, Tannistha; Holden, Matthew T.G.; Didelot, Xavier; Mehershahi, Kurosh; Boddey, Justin A.; Beacham, Ifor; Peak, Ian; Harting, John; Baybayan, Primo; Guo, Yan; Wang, Susana; How, Lee Chee; Sim, Bernice; Essex-Lopresti, Angela; Sarkar-Tyson, Mitali; Nelson, Michelle; Smither, Sophie; Ong, Catherine; Aw, Lay Tin; Hoon, Chua Hui; Michell, Stephen; Studholme, David J.; Titball, Richard; Chen, Swaine L.; Parkhill, Julian

    2015-01-01

    Burkholderia pseudomallei (Bp) is the causative agent of the infectious disease melioidosis. To investigate population diversity, recombination, and horizontal gene transfer in closely related Bp isolates, we performed whole-genome sequencing (WGS) on 106 clinical, animal, and environmental strains from a restricted Asian locale. Whole-genome phylogenies resolved multiple genomic clades of Bp, largely congruent with multilocus sequence typing (MLST). We discovered widespread recombination in the Bp core genome, involving hundreds of regions associated with multiple haplotypes. Highly recombinant regions exhibited functional enrichments that may contribute to virulence. We observed clade-specific patterns of recombination and accessory gene exchange, and provide evidence that this is likely due to ongoing recombination between clade members. Reciprocally, interclade exchanges were rarely observed, suggesting mechanisms restricting gene flow between clades. Interrogation of accessory elements revealed that each clade harbored a distinct complement of restriction-modification (RM) systems, predicted to cause clade-specific patterns of DNA methylation. Using methylome sequencing, we confirmed that representative strains from separate clades indeed exhibit distinct methylation profiles. Finally, using an E. coli system, we demonstrate that Bp RM systems can inhibit uptake of non-self DNA. Our data suggest that RM systems borne on mobile elements, besides preventing foreign DNA invasion, may also contribute to limiting exchanges of genetic material between individuals of the same species. Genomic clades may thus represent functional units of genetic isolation in Bp, modulating intraspecies genetic diversity. PMID:25236617

  18. Structures of benzylsuccinate synthase elucidate roles of accessory subunits in glycyl radical enzyme activation and activity

    PubMed Central

    Funk, Michael A.; Judd, Evan T.; Marsh, E. Neil G.; Elliott, Sean J.; Drennan, Catherine L.

    2014-01-01

    Anaerobic degradation of the environmental pollutant toluene is initiated by the glycyl radical enzyme benzylsuccinate synthase (BSS), which catalyzes the radical addition of toluene to fumarate, forming benzylsuccinate. We have determined crystal structures of the catalytic ?-subunit of BSS with its accessory subunits ? and ?, which both bind a [4Fe-4S] cluster and are essential for BSS activity in vivo. We find that BSS? has the common glycyl radical enzyme fold, a 10-stranded ?/?-barrel that surrounds the glycyl radical cofactor and active site. Both accessory subunits ? and ? display folds related to high potential iron–sulfur proteins but differ substantially from each other in how they interact with the ?-subunit. BSS? binds distally to the active site, burying a hydrophobic region of BSS?, whereas BSS? binds to a hydrophilic surface of BSS? that is proximal to the active site. To further investigate the function of BSS?, we determined the structure of a BSS?? complex. Remarkably, we find that the barrel partially opens, allowing the C-terminal region of BSS? that houses the glycyl radical to shift within the barrel toward an exit pathway. The structural changes that we observe in the BSS?? complex center around the crucial glycyl radical domain, thus suggesting a role for BSS? in modulating the conformational dynamics required for enzyme activity. Accompanying proteolysis experiments support these structural observations. PMID:24982148

  19. Orthology, Function and Evolution of Accessory Gland Proteins in the Drosophila repleta Group

    PubMed Central

    Almeida, Francisca C.; DeSalle, Rob

    2009-01-01

    The accessory gland proteins (Acps) of Drosophila have become a model for the study of reproductive protein evolution. A major step in the study of Acps is to identify biological causes and consequences of the observed patterns of molecular evolution by comparing species groups with different biology. Here we characterize the Acp complement of Drosophila mayaguana, a repleta group representative. Species of this group show important differences in ecology and reproduction as compared to other Drosophila. Our results show that the extremely high rates of Acp evolution previously found are likely to be ubiquitous among species of the repleta group. These evolutionary rates are considerably higher than the ones observed in other Drosophila groups' Acps. This disparity, however, is not accompanied by major differences in the estimated number of Acps or in the functional categories represented as previously suggested. Among the genes expressed in accessory glands of D. mayaguana almost half are likely products of recent duplications. This allowed us to test predictions of the neofunctionalization model for gene duplication and paralog evolution in a more or less constrained timescale. We found that positive selection is a strong force in the early divergence of these gene pairs. PMID:19015541

  20. Small things considered: the small accessory subunits of RNA polymerase in Gram-positive bacteria.

    PubMed

    Weiss, Andy; Shaw, Lindsey N

    2015-07-01

    The DNA-dependent RNA polymerase core enzyme in Gram-positive bacteria consists of seven subunits. Whilst four of them (?2??(')) are essential, three smaller subunits, ?, ? and ? (?9-21.5 kDa), are considered accessory. Both ? and ? have been viewed as integral components of RNAP for several decades; however, ? has only recently been described. Functionally these three small subunits carry out a variety of tasks, imparting important, supportive effects on the transcriptional process of Gram-positive bacteria. While ? is thought to have a wide range of roles, reaching from maintaining structural integrity of RNAP to ? factor recruitment, the only suggested function for ? thus far is in protecting cells from phage infection. The third subunit, ?, has been shown to have distinct influences in maintaining transcriptional specificity, and thus has a key role in cellular fitness. Collectively, all three accessory subunits, although dispensable under laboratory conditions, are often thought to be crucial for proper RNAP function. Herein we provide an overview of the available literature on each subunit, summarizing landmark findings that have deepened our understanding of these proteins and their function, and outline future challenges in understanding the role of these small subunits in the transcriptional process. PMID:25878038

  1. A single vesicle-vesicle fusion assay for in vitro studies of SNAREs and accessory proteins.

    PubMed

    Diao, Jiajie; Ishitsuka, Yuji; Lee, Hanki; Joo, Chirlmin; Su, Zengliu; Syed, Salman; Shin, Yeon-Kyun; Yoon, Tae-Young; Ha, Taekjip

    2012-05-01

    SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) proteins are a highly regulated class of membrane proteins that drive the efficient merger of two distinct lipid bilayers into one interconnected structure. This protocol describes our fluorescence resonance energy transfer (FRET)-based single vesicle-vesicle fusion assays for SNAREs and accessory proteins. Both lipid-mixing (with FRET pairs acting as lipophilic dyes in the membranes) and content-mixing assays (with FRET pairs present on a DNA hairpin that becomes linear via hybridization to a complementary DNA) are described. These assays can be used to detect substages such as docking, hemifusion, and pore expansion and full fusion. The details of flow cell preparation, protein-reconstituted vesicle preparation, data acquisition and analysis are described. These assays can be used to study the roles of various SNARE proteins, accessory proteins and effects of different lipid compositions on specific fusion steps. The total time required to finish one round of this protocol is 3–6 d. PMID:22582418

  2. Molecular Determinants for Recognition of Divergent SAMHD1 Proteins by the Lentiviral Accessory Protein Vpx.

    PubMed

    Schwefel, David; Boucherit, Virginie C; Christodoulou, Evangelos; Walker, Philip A; Stoye, Jonathan P; Bishop, Kate N; Taylor, Ian A

    2015-04-01

    The SAMHD1 triphosphohydrolase inhibits HIV-1 infection of myeloid and resting T cells by depleting dNTPs. To overcome SAMHD1, HIV-2 and some SIVs encode either of two lineages of the accessory protein Vpx that bind the SAMHD1 N or C terminus and redirect the host cullin-4 ubiquitin ligase to target SAMHD1 for proteasomal degradation. We present the ternary complex of Vpx from SIV that infects mandrills (SIVmnd-2) with the cullin-4 substrate receptor, DCAF1, and N-terminal and SAM domains from mandrill SAMHD1. The structure reveals details of Vpx lineage-specific targeting of SAMHD1 N-terminal "degron" sequences. Comparison with Vpx from SIV that infects sooty mangabeys (SIVsmm) complexed with SAMHD1-DCAF1 identifies molecular determinants directing Vpx lineages to N- or C-terminal SAMHD1 sequences. Inspection of the Vpx-DCAF1 interface also reveals conservation of Vpx with the evolutionally related HIV-1/SIV accessory protein Vpr. These data suggest a unified model for how Vpx and Vpr exploit DCAF1 to promote viral replication. PMID:25856754

  3. Human CLC-K Channels Require Palmitoylation of Their Accessory Subunit Barttin to Be Functional.

    PubMed

    Steinke, Kim Vanessa; Gorinski, Nataliya; Wojciechowski, Daniel; Todorov, Vladimir; Guseva, Daria; Ponimaskin, Evgeni; Fahlke, Christoph; Fischer, Martin

    2015-07-10

    CLC-K/barttin chloride channels are essential for NaCl re-absorption in Henle's loop and for potassium secretion by the stria vascularis in the inner ear. Here, we studied the posttranslational modification of such channels by palmitoylation of their accessory subunit barttin. We found that barttin is palmitoylated in vivo and in vitro and identified two conserved cysteine residues at positions 54 and 56 as palmitoylation sites. Point mutations at these two residues reduce the macroscopic current amplitudes in cells expressing CLC-K/barttin channels proportionally to the relative reduction in palmitoylated barttin. CLC-K/barttin expression, plasma membrane insertion, and single channel properties remain unaffected, indicating that these mutations decrease the number of active channels. R8W and G47R, two naturally occurring barttin mutations identified in patients with Bartter syndrome type IV, reduce barttin palmitoylation and CLC-K/barttin channel activity. Palmitoylation of the accessory subunit barttin might thus play a role in chloride channel dysfunction in certain variants of Bartter syndrome. We did not observe pronounced alteration of barttin palmitoylation upon increased salt and water intake or water deprivation, indicating that this posttranslational modification does not contribute to long term adaptation to variable water intake. Our results identify barttin palmitoylation as a novel posttranslational modification of CLC-K/barttin chloride channels. PMID:26013830

  4. Bilateral axillary masses mimicking as accessory breast with multiple fibroadenoma and bilateral gigantomastia in HIV-positive patient

    PubMed Central

    Singh, Saumya; Mishra, Anand K; Tewari, S; Kumar, Sanjeev

    2013-01-01

    Accessory breast is a rare entity that can present as asymptomatic masses or can cause symptoms like heaviness, pain, restriction of arm movement and limitation in daily pursuits with allied apprehension and anxiety for the patient. We present a case of bilateral axillary masses mimicking as accessory breast with multiple fibroadenoma in a 28?years, nulliparous, Indian woman who is HIV positive, which proves to be a diagnostic dilemma. Excisional biopsy was diagnostic. The rarity of such cases imposes challenges on the management in terms of diagnosis, prognosis and therapeutic options. PMID:23813993

  5. Minerals from Macedonia

    Microsoft Academic Search

    Petre Makreski; Gligor Jovanovski; Sandra Dimitrovska

    2005-01-01

    The following six sulfate minerals: anhydrite, CaSO4; brochantite, Cu4(SO4)(OH)6; jarosite, KFe3(SO4)2(OH)6; potassium alum, KAl(SO4)2·12H2O; chalcanthite, CuSO4·5H2O and epsomite, MgSO4·7H2O collected from different localities of Macedonia (Debar, Alšar, Bu?im, Bukovik), are studied and identified using Fourier transform infrared (FTIR) and Raman spectroscopy. The difficulties related to the contamination, identification and characterization of the mentioned minerals are discussed. The identification is based

  6. Properties of Minerals

    Microsoft Academic Search

    George Rapp

    Mineral chemistry as a science was established in the early years of the nineteenth century by Joseph-Louis Proust’s proposal\\u000a of the Law of Constant Composition in 1799, John Dalton’s Atomic Theory in 1805, and the development of accurate methods of\\u000a chemical analysis. By definition, a mineral has a characteristic composition expressed by its formula, e.g., halite (NaCl)\\u000a or quartz (SiO2).

  7. Microbially mediated mineral carbonation

    NASA Astrophysics Data System (ADS)

    Power, I. M.; Wilson, S. A.; Dipple, G. M.; Southam, G.

    2010-12-01

    Mineral carbonation involves silicate dissolution and carbonate precipitation, which are both natural processes that microorganisms are able to mediate in near surface environments (Ferris et al., 1994; Eq. 1). (Ca,Mg)SiO3 + 2H2CO3 + H2O ? (Ca,Mg)CO3 + H2O + H4SiO4 + O2 (1) Cyanobacteria are photoautotrophs with cell surface characteristics and metabolic processes involving inorganic carbon that can induce carbonate precipitation. This occurs partly by concentrating cations within their net-negative cell envelope and through the alkalinization of their microenvironment (Thompson & Ferris, 1990). Regions with mafic and ultramafic bedrock, such as near Atlin, British Columbia, Canada, represent the best potential sources of feedstocks for mineral carbonation. The hydromagnesite playas near Atlin are a natural biogeochemical model for the carbonation of magnesium silicate minerals (Power et al., 2009). Field-based studies at Atlin and corroborating laboratory experiments demonstrate the ability of a microbial consortium dominated by filamentous cyanobacteria to induce the precipitation of carbonate minerals. Phototrophic microbes, such as cyanobacteria, have been proposed as a means for producing biodiesel and other value added products because of their efficiency as solar collectors and low requirement for valuable, cultivable land in comparison to crops (Dismukes et al., 2008). Carbonate precipitation and biomass production could be facilitated using specifically designed ponds to collect waters rich in dissolved cations (e.g., Mg2+ and Ca2+), which would allow for evapoconcentration and provide an appropriate environment for growth of cyanobacteria. Microbially mediated carbonate precipitation does not require large quantities of energy or chemicals needed for industrial systems that have been proposed for rapid carbon capture and storage via mineral carbonation (e.g., Lackner et al., 1995). Therefore, this biogeochemical approach may represent a readily implemented and economically efficient alternative to other technologies currently under development for mineral sequestration. Dismukes GC, Carrieri D, Bennette N, Ananyev GM, Posewitz MC (2008) Aquatic phototrophs: efficient alternatives to land-based crops for biofuels. Current Opinion in Biotechnology, 19, 235-240. Ferris FG, Wiese RG, Fyfe WS (1994) Precipitation of carbonate minerals by microorganisms: Implications of silicate weathering and the global carbon dioxide budget. Geomicrobiology Journal, 12, 1-13. Lackner KS, Wendt CH, Butt DP, Joyce EL, Jr., Sharp DH (1995) Carbon dioxide disposal in carbonate minerals. Energy, 20, 1153-1170. Power IM, Wilson SA, Thom JM, Dipple GM, Gabites JE, Southam G (2009) The hydromagnesite playas of Atlin, British Columbia, Canada: A biogeochemical model for CO2 sequestration. Chemical Geology, 206, 302-316. Thompson JB, Ferris FG (1990) Cyanobacterial precipitation of gypsum, calcite, and magnesite from natural alkaline lake water. Geology, 18, 995-998.

  8. Minerals Yearbook 1989: Boron

    SciTech Connect

    Lyday, P.A.

    1990-08-01

    U.S. production and sales of boron minerals and chemicals decreased during the year. Domestically, glass fiber insulation was the largest use for borates, followed by sales to distributors, textile-grade glass fibers, and borosilicate glasses. California was the only domestic source of boron minerals. The United States continued to provide essentially all of its own supply while maintaining a strong position as a source of sodium borate products and boric acid exported to foreign markets. Supplementary U.S. imports of Turkish calcium borate and calcium-sodium borate ores, borax, and boric acid, primarily for various glass uses, continued.

  9. Morphometric Investigations of the Connections between the Posterior C-1 Root and the Accessory Nerve in the Human Cranial Cervical Region

    Microsoft Academic Search

    U. Schneider; A. Biörnsen; R. Hagenah

    1996-01-01

    The anastomosis of the spinal section of the accessory nerve and the posterior C-1 root was examined in eight human corpses at the light-microscopical level by image analysis. The numbers of nerve fibers caudal and cranial to the anastomosis were compared. The morphometric data suggest that somatic efferent fibers of the spinal accessory nerve extend to proprioceptors in the sternocleidomastoideus

  10. Rocks and Minerals Of Kentucky

    NSDL National Science Digital Library

    The Kentucky rocks highlighted on this website are chiefly sedimentary, such as limestone and dolostone, since sedimentary rocks cover approximately 99 percent of the state. You will find an extensive list of minerals and mineral groups, such as oxides or halides, and mineral property descriptions that cover hardness, cleavage, color, crystal system, streak, and more. These properties are also discussed in relation to their use in identifying unknown minerals. Igneous and metamorphic rocks are covered in relation to gold and silver deposits, and the legend of the Jonathon Swift Silver mines. Information on Kentucky's state rock and mineral, museums, rock clubs, and mineral deposits are included.

  11. Raman Spectroscopy for Mineral Identification and Quantification for in situ Planetary Surface Analysis: A Point Count Method

    NASA Technical Reports Server (NTRS)

    Haskin, Larry A.; Wang, Alian; Rockow, Kaylynn M.; Jolliff, Bradley L.; Korotev, Randy L.; Viskupic, Karen M.

    1997-01-01

    Quantification of mineral proportions in rocks and soils by Raman spectroscopy on a planetary surface is best done by taking many narrow-beam spectra from different locations on the rock or soil, with each spectrum yielding peaks from only one or two minerals. The proportion of each mineral in the rock or soil can then be determined from the fraction of the spectra that contain its peaks, in analogy with the standard petrographic technique of point counting. The method can also be used for nondestructive laboratory characterization of rock samples. Although Raman peaks for different minerals seldom overlap each other, it is impractical to obtain proportions of constituent minerals by Raman spectroscopy through analysis of peak intensities in a spectrum obtained by broad-beam sensing of a representative area of the target material. That is because the Raman signal strength produced by a mineral in a rock or soil is not related in a simple way through the Raman scattering cross section of that mineral to its proportion in the rock, and the signal-to-noise ratio of a Raman spectrum is poor when a sample is stimulated by a low-power laser beam of broad diameter. Results obtained by the Raman point-count method are demonstrated for a lunar thin section (14161,7062) and a rock fragment (15273,7039). Major minerals (plagioclase and pyroxene), minor minerals (cristobalite and K-feldspar), and accessory minerals (whitlockite, apatite, and baddeleyite) were easily identified. Identification of the rock types, KREEP basalt or melt rock, from the 100-location spectra was straightforward.

  12. Raman Spectroscopy for Mineral Identification and Quantification for in situ Planetary Surface Analysis: A Point Count Method

    NASA Astrophysics Data System (ADS)

    Haskin, Larry A.; Wang, Alian; Rockow, Kaylynn M.; Jolliff, Bradley L.; Korotev, Randy L.; Viskupic, Karen M.

    1997-08-01

    Quantification of mineral proportions in rocks and soils by Raman spectroscopy on a planetary surface is best done by taking many narrow-beam spectra from different locations on the rock or soil, with each spectrum yielding peaks from only one or two minerals. The proportion of each mineral in the rock or soil can then be determined from the fraction of the spectra that contain its peaks, in analogy with the standard petrographic technique of point counting. The method can also be used for nondestructive laboratory characterization of rock samples. Although Raman peaks for different minerals seldom overlap each other, it is impractical to obtain proportions of constituent minerals by Raman spectroscopy through analysis of peak intensities in a spectrum obtained by broad-beam sensing of a representative area of the target material. That is because the Raman signal strength produced by a mineral in a rock or soil is not related in a simple way through the Raman scattering cross section of that mineral to its proportion in the rock, and the signal-to-noise ratio of a Raman spectrum is poor when a sample is stimulated by a low-power laser beam of broad diameter. Results obtained by the Raman point-count method are demonstrated for a lunar thin section (14161,7062) and a rock fragment (15273,7039). Major minerals (plagioclase and pyroxene), minor minerals (cristobalite and K-feldspar), and accessory minerals (whitlockite, apatite, and baddeleyite) were easily identified. Identification of the rock types, KREEP basalt or melt rock, from the 100-location spectra was straightforward.

  13. Bone Mineral Measurements.

    PubMed

    Doroudinia, Abtin; Colletti, Patrick M

    2015-08-01

    The accurate measurement of bone mineral density using noninvasive methods can be of value in the detection and evaluation of primary and secondary causes of decreased bone mass. This includes primary osteoporosis and secondary disorders, such as hyperparathyroidism, osteomalacia, multiple myeloma, diffuse metastases, and glucocorticoid therapy or intrinsic excess.By far, the largest patient population is that encompassed by primary osteoporosis with increased susceptibility to fractures in the absence of other recognizable causes of bone loss.Primary osteoporosis is a common clinical disorder and a major public health problem because of the significant number of related bone fractures occurring annually. Because the risk of vertebral and femoral neck fractures rises dramatically as bone mineral density falls, fracture risk in individual patients may be estimated. Furthermore, in estrogen-deficient women, bone mineral density values may be used to make rational decisions about hormone replacement therapy, or other bone mineral therapies, and as follow-up in assessing the success of such treatment.In this article, we discuss different methods of bone densitometry and will focus on dual-energy x-ray absorptiometry (DXA) with discussing the factors which should be considered for interpretation of DXA scan. PMID:26147459

  14. Bioleaching of Minerals

    SciTech Connect

    F. Roberto

    2002-02-01

    Bioleaching is the term used to describe the microbial dissolution of metals from minerals. The commercial bioleaching of metals, particularly those hosted in sulfide minerals, is supported by the technical disciplines of biohydrometallurgy, hydrometallurgy, pyrometallurgy, chemistry, electrochemistry, and chemical engineering. The study of the natural weathering of these same minerals, above and below ground, is also linked to the fields of geomicrobiology and biogeochemistry. Studies of abandoned and disused mines indicate that the alterations of the natural environment due to man's activities leave as remnants microbiological activity that continues the biologically mediated release of metals from the host rock (acid rock drainage; ARD). A significant fraction of the world's copper, gold and uranium is now recovered by exploiting native or introduced microbial communities. While some members of these unique communities have been extensively studied for the past 50 years, our knowledge of the composition of these communities, and the function of the individual species present remains relatively limited. Nevertheless, bioleaching represents a major strategy in mineral resource recovery whose importance will increase as ore reserves decline in quality, become more difficult to process (due to increased depth, increased need for comminution, for example), and as environmental considerations eliminate traditional physical processes such as smelting, which have served the mining industry for hundreds of years.

  15. Mineral Characterization for Combustion

    Microsoft Academic Search

    Colin R. Ward

    The material referred to as “mineral matter” in coal has been to the combustion engineer a close to random association of chemical elements. These “random” elements are transformed in the combustion process to ash, react to form boiler deposits (slagging); abrade the internal parts of the boiler (erosion), and produce vapor phases that react with the metals in the boiler

  16. Marine Mineral Exploration

    Microsoft Academic Search

    Fren N. Spiess

    1988-01-01

    This book is the forty-first in the Elsevier Oceanography Series, and with it the series has come full circle. Its first title, published in 1964, was John Mero's landmark study The Mineral Resources of the Sea [Mero, 1964]. Looking back at that first major treatise and comparing it with this and other recent books on the topic [e.g., Teleki et

  17. ARM: Automatic Rule Miner

    Microsoft Academic Search

    Slim Abdennadher; Abdellatif Olama; Noha Salem; Amira Thabet

    2006-01-01

    Rule-based formalisms are ubiquitous in computer science. However, a difficulty that arises frequently when specifyingor program- ming the rules is to determine which effects should be propagated by these rules. In this paper, we present a tool called ARM (Automatic Rule Miner) that generates rules for relations over finite domains. ARM offers a rich functionality to provide the user with

  18. Mineral mining equipment

    SciTech Connect

    Monks, H.

    1980-11-25

    A mineral mining machine hauls itself along a working face by engaging a round link chain. The links of the chain are fed sequentially from link-retaining pockets in a track component arranged around the working face, around a driven sprocket assembly on the machine and returned to the pockets.

  19. TRACE MINERAL DEFICIENCIES

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The impact of trace element deficiencies of human health and well-being is presented in an abridged form. The general biological roles, mechanisms involved in homeostasis, factors affecting the manifestation of deficiency signs, and treatments for deficiencies of trace mineral elements are described...

  20. Mixtures and mineral reactions

    SciTech Connect

    Saxena, S.; Ganguly, J.

    1987-01-01

    Considerable progress has been made in our understanding of the physicochemical evolution of natural rocks through systematic analysis of the compositional properties and phase relations of their mineral assemblages. This book brings together concepts of classical thermodynamics, solution models, and atomic ordering and interactions that constitute a basis of such analysis, with examples of application to subsolidus petrological problems.

  1. Energy and Mineral Resources

    NSDL National Science Digital Library

    Timothy Heaton

    This site contains 16 questions on the topic of energy and mineral resources, which covers energy sources, resource types, and uses of resources. This is part of the Principles of Earth Science course at the University of South Dakota. Users submit their answers and are provided immediate verification.

  2. Oxalate minerals on Mars?

    NASA Astrophysics Data System (ADS)

    Applin, D. M.; Izawa, M. R. M.; Cloutis, E. A.; Goltz, D.; Johnson, J. R.

    2015-06-01

    Small amounts of unidentified organic compounds have only recently been inferred on Mars despite strong reasons to expect significant concentrations and decades of searching. Based on X-ray diffraction and reflectance spectroscopic analyses we show that solid oxalic acid and its most common mineral salts are stable under the pressure and ultraviolet irradiation environment of the surface of Mars, and could represent a heretofore largely overlooked reservoir of organic carbon in the martian near-surface. In addition to the delivery to Mars by carbonaceous chondrites, oxalate minerals are among the predicted breakdown products of meteoritic organic matter delivered to the martian surface, as well as any endogenic organic carbon reaching the martian surface from the interior. A reinterpretation of pyrolysis experiments from the Viking, Phoenix, and Mars Science Laboratory missions shows that all are consistent with the presence of significant concentrations of oxalate minerals. Oxalate minerals could be important in numerous martian geochemical processes, including acting as a possible nitrogen sink (as ammonium oxalate), and contributing to the formation of “organic” carbonates, methane, and hydroxyl radicals.

  3. Engineering and Mineral Resources

    E-print Network

    Mohaghegh, Shahab

    News ????????????????? ® College of Engineering and Mineral Resources Winter 2008 table of contents. . . . . . . . . . . . . . . . . . . . 7 wvCROSSROADS DepartmentofCivilandEnvironmentalEngineering Civil engineering exchange program and environmental engineering with a focus in transportation will have the opportunity to study abroad as part

  4. MINERAL WATERS OF BOHEMIA

    Microsoft Academic Search

    A. V. Zhevlakov

    1961-01-01

    Mineral waters of Bohemia are characterized by a considerable variety of chemical gaseous composition. They may be subdivided chemically into: calcium bicarbonate, sodium bicarbonate, magnesium sulfate, sodium sulfate, and ferruginous sulfate. Carbonated-water springs are chiefly developed along the periphery of the Bohemian massif. The conditions of formation of such springs in Karlovy Vary, Frantiskovy Lázn? and Mariánské Lazne and Luga?evice

  5. Binding-induced Stabilization and Assembly of the Phage P22 Tail Accessory Factor gp4

    SciTech Connect

    Olia,A.; Al-Bassam, J.; Winn-Stapley, D.; Joss, L.; Casjens, S.; Cingolani, G.

    2006-01-01

    To infect and replicate, bacteriophage P22 injects its 43 kbp genome across the cell wall of Salmonella enterica serovar Typhimurium. The attachment of phage P22 to the host cell as well as the injection of the viral DNA into the host is mediated by the virion's tail complex. This 2.8 MDa molecular machine is formed by five proteins, which include the portal protein gp1, the adhesion tailspike protein gp9, and three tail accessory factors: gp4, gp10, gp26. We have isolated the tail accessory factor gp4 and characterized its structure and binding interactions with portal protein. Interestingly, gp4 exists in solution as a monomer, which displays an exceedingly low structural stability (T{sub m} 34 {sup o}C). Unfolded gp4 is prone to aggregation within a narrow range of temperatures both in vitro and in Salmonella extracts. In the virion the thermal unfolding of gp4 is prevented by the interaction with the dodecameric portal protein, which stabilizes the structure of gp4 and suppresses unfolded gp4 from irreversibly aggregating in the Salmonella milieu. The structural stabilization of gp4 is accompanied by the concomitant oligomerization of the protein to form a ring of 12 subunits bound to the lower end of the portal ring. The interaction of gp4 with portal protein is complex and likely involves the distinct binding of two non-equivalent sets of six gp4 proteins. Binding of the first set of six gp4 equivalents to dodecameric portal protein yields a gp(1){sub 12}:gp(4){sub 6} assembly intermediate, which is stably populated at 30 {sup o}C and can be resolved by native gel electrophoresis. The final product of the assembly reaction is a bi-dodecameric gp(1){sub 12}:gp(4){sub 12} complex, which appears hollow by electron microscopy, suggesting that gp4 does not physically plug the DNA entry/exit channel, but acts as a structural adaptor for the other tail accessory factors: gp10 and gp26.

  6. International minerals: a national perspective

    SciTech Connect

    Agnew, A.F. (ed.)

    1983-01-01

    Seven authors bring a variety of perspectives to the subject of minerals availability. In the domestic area, an overview of the US strategic mineral situation is followed by a discussion of changes in one state's mineral policy decisions over a 200-year period. Later chapters describe the potential of Alaska's mineral resources, with a focus on the immediate need for a thorough inventory of this vast area, and the nature and sources of mineral information available to Canadian policymakers as useful models in making inventories. In the international area, there is a discussion of the key role of South Africa in the world mineral picture and the strategic importance to the Soviet Union of the mineral wealth of Afghanistan. The volume concludes with a review of the history of US mineral policies. Separate abstracts were prepared for the seven chapters selected for the Energy Data Base (EDB) and Energy Abstracts for Policy Analysis (EAPA).

  7. Mineral oil soluble borate compositions

    SciTech Connect

    Dulat, J.

    1981-09-15

    Alkali metal borates are reacted with fatty acids or oils in the presence of a low hlb value surfactant to give a stable mineral oil-soluble product. Mineral oil containing the borate can be used as a cutting fluid.

  8. Vitamins and Minerals during Pregnancy

    MedlinePLUS

    ... added to your dashboard . Vitamins and minerals during pregnancy Your body uses vitamins, minerals and other nutrients ... certain foods. Which nutrients are most important during pregnancy? All nutrients are important, but these six play ...

  9. Private Mineral Project - Part 1

    NSDL National Science Digital Library

    Dexter Perkins

    In this semester-long private mineral project, students become experts on one mineral. They write a paper about their mineral and use key information about it to publish a web page. Information should include provenance, physical properties, composition, recent related literature, photos of samples, optical properties, x-ray pattern, crystallography, economic value, atomic structure, other closely related minerals, associated myths, and a complete list of references based on GSA format.

  10. Accuracy of Normal-Dose Contrast-Enhanced MR Angiography in Assessing Renal Artery Stenosis and Accessory Renal Arteries

    Microsoft Academic Search

    Michael B. J. M. Korst; Frank B. M. Joosten; Cornelis T. Postma; Gerrit J. Jager; Johan K. Krabbe; Jelle O. Barentsz

    OBJECTIVE . The purpose of this study was to evaluate the accuracy of breath-hold con- trast-enhanced MR angiography in the assessment of renal artery stenosis and accessory renal arteries using a standard dose of gadolinium. SUBJECTS AND METHODS . Thirty-eight patients suspected of having renal artery stenosis underwent MR angiography and intraarterial digital subtraction angiography, which was the method of

  11. Histological and lectin histochemical studies on the main and accessory olfactory bulbs in the Japanese striped snake, Elaphe quadrivirgata.

    PubMed

    Kondoh, Daisuke; Wada, Akimi; Endo, Daisuke; Nakamuta, Nobuaki; Taniguchi, Kazuyuki

    2013-01-01

    The main and accessory olfactory bulbs were examined by histological methods and lectin histochemistry in the Japanese striped snake. As the results, the histological properties are similar between the main olfactory bulb and the accessory olfactory bulb. In lectin histochemistry, 21 lectins used in this study showed similar binding patterns in the main olfactory bulb and the accessory olfactory bulb. In detail, 15 lectins stained these olfactory bulbs with similar manner, and 6 lectins did not stain them at all. Two lectins, Lycopersicon esculentum lectin (LEL) and Solanum tuberosum lectin (STL), stained the nerve and glomerular layers and did not stain any other layers in both olfactory bulbs. Four lectins, Soybean agglutinin (SBA), Vicia villosa agglutinin (VVA), Peanut agglutinin (PNA) and Phaseolus vulgaris agglutinin-L (PHA-L) stained the nerve and glomerular layers more intensely than other layers in both olfactory bulbs. In addition, VVA showed the dot-like stainings in the glomeruli of both olfactory bulbs. These findings suggest that the degree of development and the properties of glycoconjugates are similar between the main olfactory bulb and the accessory olfactory bulb in the Japanese striped snake. PMID:23257605

  12. Prevention of ultraviolet radiation-induced suppression of accessory cell function of Langerhans cells by Aloe vera gel components.

    PubMed

    Lee, C K; Han, S S; Mo, Y K; Kim, R S; Chung, M H; Park, Y I; Lee, S K; Kim, Y S

    1997-10-01

    The active components of Aloe vera gel that can prevent ultraviolet B (UVB)-induced suppression of accessory cell function of Langerhans cells (LC) were purified by activity-guided sequential fractionation followed by in vitro functional assay. The functional assay was based on the fact that exposure of freshly isolated murine epidermal cells (EC) to UVB radiation resulted in impairment of accessory cell function of LC, as measured by their ability to support anti-CD3 monoclonal antibody (mAb)-primed T-cell mitogenesis. This UVB-suppressed LC accessory cell function was prevented by addition of partially purified Aloe gel components to cultures of UVB-irradiated EC. The Aloe gel components appeared to prevent events occurring within the first 24 h after UVB irradiation that lead to the impairment of accessory cell function. The Aloe gel components did not cause proliferation of anti-CD3 mAb-primed T-cells, nor did induce proliferation of normal EC. The activity-guided final purification of Aloe gel components resulted in the isolation of two components. Both of the components were small molecular weight (MW) substances with an apparent MW of less than 1,000 Da but different from each other in net charge characteristics at pH 7.4. These results suggest that Aloe vera gel contains at least two small molecular weight immunomodulators that may prevent UVB-induced immune suppression in the skin. PMID:9403333

  13. UVB Radiation and Human Monocyte Accessory Function: Differential Effects on Pre-Mitotic Events in T-Cell Activation

    Microsoft Academic Search

    Jean Krutmann; Gary M. Kammer; Zahra Toossi; Robert L. Waller; Jerrold J. Ellner; Craig A. Elmets

    1990-01-01

    Purified T lymphocytes fail to proliferate in response to antigenic and mitogenic stimuli when cultured in the presence of accessory cells that have been exposed in vitro to sublethal doses of UVB radiation. Because proliferation represents a final stage in the T-cell activation process, the present study was conducted to determine whether T cells were able to progress through any

  14. Chronic prostatitis and male accessory gland infection - is there an impact on male infertility (diagnosis and therapy)?

    Microsoft Academic Search

    K. Everaert; A. Mahmoud; C. Depuydt; M. Maeyaert; F. Comhaire

    2003-01-01

    Summary. The aim of this article was to discuss by means of a review of the literature and own study material the multifactorial aetiology of male infer- tility, extrapolate this hypothesis to male accessory gland infection (MAGI) and relate it to chronic prostatitis and its treatment. Infertility is a multifac- torial disease and diagnosis and therapy must be oriented as

  15. Syndrome of Ichthyosis congenita, Neurosensory Deafness, Oligophrenia, Dental Aplasia, Brachydactyly, Clinodactyly, Accessory Cervical Ribs and Carcinoma of the Thyroid

    Microsoft Academic Search

    Thomas Ruzicka; Günter Goerz; Ingrun Anton-Lamprecht

    1981-01-01

    We report the case of a 15-year-old girl with an uneventful family history. Her skin condition was clinically, histologically and ultrastructurally compatible with the diagnosis of ichthyosis congenita. She suffered from neurosensory deafness and oligophrenia. Further findings included dental aplasia, brachydactyly, clinodactyly and accessory cervical ribs. At the age of 14, a thyroid carcinoma was diagnosed. Therapy with a retinoid

  16. Efflorescent minerals associated with coal

    Microsoft Academic Search

    Nuhfer

    1967-01-01

    A study of efforescent coal minerals was made which included the identification, description, and mode of occurrence of coal associated mineral efflorescenses found in the bituminous coal mining area surrounding Morgantown, West Virginia. Samples of efflorescences were collected from road cuts, strip mines, entrances to underground mines, and mine discharge pumps and were analyzed for mineral and chemical composition by

  17. The Indian Mineral Development Act.

    ERIC Educational Resources Information Center

    Houle, Antoinette

    1986-01-01

    Discusses the objectives of the Indian Mineral Development Act of 1982 (IMDA) and the possible effects it may have on Indian mineral development. Explains how the provisions of IMDA work to provide Indian tribes with greater flexibility for the development and sale of their mineral resources. (ML)

  18. Rare Earth Elemental Signatures in Fungal Fruiting Bodies as Probes into Mineral Breakdown Reactions in Post-glacial Landscapes

    NASA Astrophysics Data System (ADS)

    Bryce, J. G.; Hobbie, E. A.

    2008-12-01

    The application of rare earth element (REE) abundances in low temperature geochemistry and biogeochemistry has improved our understanding of the cycling of various micro- and macronutrients from the bedrock into terrestrial ecosystems. In many continental rocks, REEs are concentrated in accessory phases such as apatite and monazite. These phosphate mineral phases break down readily and may be especially important nutrient sources, particularly for P and Ca, in recently glaciated terrains. Several studies (e.g., 1-3) have suggested that the presence of ectomycorrhizal (ECM) fungi, due to the organic acids they secrete, may play an especially important role in this weathering process. A field-based experiment implementing mesh bags doped with specific mineral compositions confirmed that ECM fungal tissues do record the REE signatures of the minerals they break down (4). In an effort to understand the relative role different ECM fungi may play in mineral breakdown reactions, we have measured REE abundances in tissues of several ECM fruiting bodies. Our preliminary data include Russula, Suillus Americana, Leccinum and Lactarius ECM fungi from three postglacial landscapes. At a given site, the relative abundance of REEs varies between the different ECM fungi. Interestingly, we found distinctions in tissue La/Ce values at two of the sites. Leccinum, a deep rooter, shows much lower La/Ce than the companion Russula and Lactarius samples from the same site. Similarly Suillus tissues demonstrated lower La/Ce when compared to Russula growing nearby. Lower La/Ce is consistent with enhanced dissolution of the mineral apatite, a common accessory phase. While the influence of symbiotic host (beech vs. oak vs. pine) may play some role in the distinctive REE signatures recorded by the fruiting bodies, we attribute the observed differences to organic acid production and tendency to colonize in different horizons of the soil profile. (1) Wallander, Plant and Soil, 2000; (2) Blum et al., Nature, 2002; (3) Hoffland et al., Front Ecol Environ., 2003; (4) Hagerburg et al., Plant and Soil, 2003.

  19. Massive upper gastrointestinal bleeding from an accessory splenic artery mimicking isolated gastric varices.

    PubMed

    Kervancioglu, S; Yilmaz, F G; Gulsen, M; Kervancioglu, P; Kervancioglu, R

    2013-11-01

    Knowledge of anatomical variations of coeliac trunk and its branches is important for surgeons and interventional radiologists planning surgical and radiological interventions. We describe a case of a 42-year-old male with an accessory splenic artery (ASA) originating from the left gastric artery (LGA) running in the wall of gastric fundus and mimicking isolated gastric varices, which was observed during endoscopy. Bleeding from this artery was massive and was managed with endovascular coil embolisation. Coeliac angiography of the patient with upper gastrointestinal bleeding showed that the coeliac trunk divided into 3 arteries: the LGA, the splenic artery, and the right hepatic artery. Additionally, the variations of ASA and the left hepatic artery arising from LGA, and the left and right inferior phrenic arteries arising from ASA were identified. This case is the first to be presented in the literature with ASA originating from LGA that was situated in the gastric wall where inferior phrenic arteries arose from the ASA. PMID:24402761

  20. A software tool to evaluate crystal types and morphological developments of accessory zircon

    NASA Astrophysics Data System (ADS)

    Sturm, Robert

    2014-08-01

    Computer programs for an appropriate visualization of crystal types and morphological developments of accessory zircon are not available hitherto. Usually, typological computations are conducted by using simple calculation tools or spread-sheet programs. In practice, however, high numbers of data sets including information of numerous zircon populations have to be processed and stored. The paper describes the software ZIRCTYP, which is a macro-driven program within the Microsoft Access database management system. It allows the computation of zircon morphologies occurring in specific rock samples and their presentation in typology diagrams. In addition, morphological developments within a given zircon population are presented (1) statistically and (2) graphically as crystal sequences showing initial, intermediate, and final growth stages.

  1. Research on the Application of New Accessory Ingredient in Cashmere Hank Yarn Dyeing

    NASA Astrophysics Data System (ADS)

    Wang, Li-ping; Wang, Cun-tao

    There exist many problems in the process of cashmere yarn dyeing such as great difficulty in dyeing, large damage to yarn, low strength, and lack of brightness in color. Currently the technologies of hank yarn dyeing in foreign countries are very advanced, but most of them aim for hank yarn dyeing of cotton and silk with few reports on the research about hank dyeing of cashmere. In this paper, we will use reactive dyes to dye cashmere yarn, do comparative experiment on pre-treatment lotion Kierlon OL and Da ai wen, and add a smooth anti-creasing agent Primasol JET and cashmere protective agent WSM in the dyeing process and analyze their impact on the performance of cashmere hank yarn dyeing to determine a reasonable dose of accessory ingredient. This dyeing program can be applied to guide the actual production, achieving the effects of improving the performance of cashmere hank yarn dyeing and enhancing the quality of dyed yarn

  2. Smartphone based health accessory for colorimetric detection of biomarkers in sweat and saliva.

    PubMed

    Oncescu, Vlad; O'Dell, Dakota; Erickson, David

    2013-08-21

    The mobile health market is rapidly expanding and portable diagnostics tools offer an opportunity to decrease costs and increase the availability of healthcare. Here we present a smartphone based accessory and method for the rapid colorimetric detection of pH in sweat and saliva. Sweat pH can be correlated to sodium concentration and sweat rate in order to indicate to users the proper time to hydrate during physical exercise and avoid the risk of muscle cramps. Salivary pH below a critical threshold is correlated with enamel decalcification, an acidic breakdown of calcium in the teeth. We conduct a number of human trials with the device on a treadmill to demonstrate the ability to monitor changes in sweat pH due to exercise and electrolyte intake and predict optimal hydration. Additionally, we perform trials to measure salivary pH over time to monitor the effects of diet on oral health risks. PMID:23784453

  3. An enhanced method for accessory pathway localization in case of Wolff-Parkinson-White syndrome.

    PubMed

    Miklós, Szilágyi Sándor; Szilágyi, L; Görög, L K; Luca, C T; Cozma, D; Ivanica, G; Benyó, Z

    2011-09-01

    This paper presents an analysis of the Arruda accessory pathway localization method for patients suffering from Wolff-Parkinson-White syndrome, with modifications to increase the overall accuracy. The Arruda method was tested on a total of 79 cases, and 91.1% localization performance was reached. After a deeper analysis of each decision point of the Arruda localization method, we considered that the lead aVF was not as relevant as other leads (I, II, III, V1) used. The branch of the decision tree, which evaluates the left ventricle positions, was entirely replaced using different decision criteria based on the same biological parameters. The modified algorithm significantly improves the localization accuracy in the left ventricle, reaching 94.9%. An accurate localization performance of non-invasive methods is relevant because it can enlighten the necessary invasive interventions, and it also reduces the discomfort caused to the patient. PMID:21893474

  4. THERMAL INCREMENTS FOR PULSATION-FREQUENCY IN "ACCESSORY HEARTS" OF NOTONECTA

    PubMed Central

    Crozier, W. J.; Stier, T. J. B.

    1927-01-01

    The frequencies of pulsation of the "accessory hearts" in the isolated swimming-legs of Notonecta were studied in relation to temperature, with the idea that in such organs central nervous control is impossible, and that in an isolated system irreversibly proceeding toward death it might be expected that further evidence would be found regarding the supposed specific significance of critical thermal increments. A number of values of µ are found, commonly 8,200; 16,200; or 32,200; less frequently 11,400; 19,800; and 24,500. These values are definitely contrasted with that (12,300) typical for heart beat frequencies in arthropods. They exhibit interrelationships of the sorts already found in other cases. There occur also sharp irreversible changes in frequency of pulsation, which may or may not be accompanied by change of increment. The net result is held to be confirmatory of the interpretation of thermal relations proposed in earlier papers. PMID:19872338

  5. 43 CFR 19.8 - Prospecting, mineral locations, mineral patents, and mineral leasing within National Forest...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...mineral leasing within National Forest Wilderness. 19.8 Section...the Interior WILDERNESS PRESERVATION National Wilderness Preservation System § 19.8 Prospecting...mineral leasing within National Forest Wilderness....

  6. 43 CFR 19.8 - Prospecting, mineral locations, mineral patents, and mineral leasing within National Forest...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...mineral leasing within National Forest Wilderness. 19.8 Section...the Interior WILDERNESS PRESERVATION National Wilderness Preservation System § 19.8 Prospecting...mineral leasing within National Forest Wilderness....

  7. Intervention of D-glucose ameliorates the toxicity of streptozotocin in accessory sex organs of rat

    SciTech Connect

    Vikram, A.; Tripathi, D.N.; Ramarao, P. [Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Sector-67, S.A.S. Nagar, Punjab-160062 (India); Jena, G.B. [Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Sector-67, S.A.S. Nagar, Punjab-160062 (India)], E-mail: gbjena@gmail.com

    2008-01-01

    Streptozotocin (STZ) is a naturally occurring compound isolated from Streptomyces achromogens. It is used extensively for inducing diabetes in experimental animals. Diabetes mellitus is known to have proven adverse effects on male sexual organs and their reproductive functions. The atrophy of prostate gland and other organs of the genitourinary tract were observed in experimental diabetic animals. STZ exhibits a structural resemblance to D-glucose due to the presence of sugar moiety in its structure. Pancreatic {beta}-cells mainly contain GLUT1 and GLUT2 glucose transporters. Possibly due to structural resemblance, STZ and D-glucose, share a common recognition site for entry into the {beta}-cells. The objective of the present study is to evaluate the effect of D-glucose on STZ-induced toxicity in accessory sex organs of male rats. Animals were kept on overnight fasting. One group received vehicle and served as negative control, while all other groups were given STZ (45 mg/kg). Animals that received only STZ served as positive control. The effect of D-glucose was studied on STZ treated animals with different dosage of D-glucose (250, 500, 1000 and 2000 mg/kg). Restoration of body weight, plasma glucose and plasma insulin was evident only at 1000 and 2000 mg/kg of D-glucose. The protective effect of D-glucose is evident only when it is administered simultaneously with STZ. In the present investigation, we report that simultaneous administration of D-glucose along with STZ ameliorates STZ-induced toxicity. This is evident from the restoration of accessory sex organ's weight, cellular morphology as well as insulin level.

  8. Breakage-fusion-bridge Cycles and Large Insertions Contribute to the Rapid Evolution of Accessory Chromosomes in a Fungal Pathogen

    PubMed Central

    Croll, Daniel; Zala, Marcello; McDonald, Bruce A.

    2013-01-01

    Chromosomal rearrangements are a major driver of eukaryotic genome evolution, affecting speciation, pathogenicity and cancer progression. Changes in chromosome structure are often initiated by mis-repair of double-strand breaks in the DNA. Mis-repair is particularly likely when telomeres are lost or when dispersed repeats misalign during crossing-over. Fungi carry highly polymorphic chromosomal complements showing substantial variation in chromosome length and number. The mechanisms driving chromosome polymorphism in fungi are poorly understood. We aimed to identify mechanisms of chromosomal rearrangements in the fungal wheat pathogen Zymoseptoria tritici. We combined population genomic resequencing and chromosomal segment PCR assays with electrophoretic karyotyping and resequencing of parents and offspring from experimental crosses to show that this pathogen harbors a highly diverse complement of accessory chromosomes that exhibits strong global geographic differentiation in numbers and lengths of chromosomes. Homologous chromosomes carried highly differentiated gene contents due to numerous insertions and deletions. The largest accessory chromosome recently doubled in length through insertions totaling 380 kb. Based on comparative genomics, we identified the precise breakpoint locations of these insertions. Nondisjunction during meiosis led to chromosome losses in progeny of three different crosses. We showed that a new accessory chromosome emerged in two viable offspring through a fusion between sister chromatids. Such chromosome fusion is likely to initiate a breakage-fusion-bridge (BFB) cycle that can rapidly degenerate chromosomal structure. We suggest that the accessory chromosomes of Z. tritici originated mainly from ancient core chromosomes through a degeneration process that included BFB cycles, nondisjunction and mutational decay of duplicated sequences. The rapidly evolving accessory chromosome complement may serve as a cradle for adaptive evolution in this and other fungal pathogens. PMID:23785303

  9. Fracture resistance of structurally compromised premolar roots restored with single and accessory glass or quartz fiber posts

    PubMed Central

    Sharafeddin, Farahnaz; Alavi, Ali Asghar; Zare, Samira

    2014-01-01

    Background: Glass and quartz fiber posts are used in restoration of structurally compromised roots. Accessory fiber posts are recently introduced to enhance the fiber post adaptation. This study evaluated the effectiveness of glass versus quartz accessory fiber posts. Materials and Methods: In this experimental study, 40 mandibular premolar roots with similar dimension (radius of 3.5 ± 0.2 mm and length of 13 ± 0.5 mm) were selected and their root canals were flared until 1.5 mm of dentin wall remained. They were randomly assigned to four groups (n = 10) and restored as follows: Exacto glass fiber post (EX), Exacto glass fiber post + 2 Reforpin accessories (EXR), D. T. Light quartz fiber post (DT), and D. T. Light quartz fiber post + 2 Fibercone accessories (DTF). All posts were cemented with Duo-Link resin cement and the cores were built with the particulate filler composite. Following 1-week water storage, specimens were subjected to fracture loads in a universal testing machine. The maximum loads and failure modes were recorded and analyzed with the two-way analysis of variance (ANOVA) and Fisher's exact tests (? = 0.05). Results: The mean fracture resistance values (N) were 402.8 (EX), 378.4 (EXR), 400.1 (DT), and 348.5 (DTF). Two-way ANOVA test showed neither reinforcing method (P = 0.094), nor post composition (P = 0.462) had statistically significant differences on fracture resistance of the structurally compromised premolar teeth. Fisher's exact test also demonstrated no statistically significant difference regarding two variables (P = 0.695). Core fracture was the most common failure mode (62.5%). Conclusion: Glass and quartz fiber posts with or without accessories restored the weakened premolar roots equally. PMID:24932200

  10. The direction of plasma membrane exchange between lymphocytes and accessory cells by trogocytosis is influenced by the nature of the accessory cell.

    PubMed

    Daubeuf, Sandrine; Lindorfer, Margaret A; Taylor, Ronald P; Joly, Etienne; Hudrisier, Denis

    2010-02-15

    Exchange of plasma membrane fragments, including cell-surface proteins and lipids, in conjugates formed between lymphocytes and their cellular partners is a field of intense investigation. Apart from its natural occurrence during Ag recognition, the process of membrane transfer can be triggered in experimental or therapeutic settings when lymphocytes targeted by Abs are conjugated to FcgammaR-expressing accessory cells. The direction of membrane capture (i.e., which of the two cells is going to donate or accept plasma membrane fragments) can have important functional consequences, such as insensitivity of tumor cells to treatment by therapeutic mAbs. This effect, called antigenic modulation or shaving, occurs as a result of a process in which the FcgammaR-expressing cells remove the mAb and its target protein from the tumor cells. We therefore analyzed this process in conjugates formed between various FcgammaR-expressing cells and a series of normal or tumor T and B cells opsonized with different Abs capable of triggering membrane exchange (including the therapeutic Ab rituximab). Our results show that the direction of membrane capture is dictated by the identity of the FcgammaR-expressing cell, much more so than the type of lymphocyte or the Ab used. We found that monocytes and macrophages are prone to be involved in bidirectional trogocytosis with opsonized target cells, a process they can perform in parallel to phagocytosis. Our observations open new perspectives to understand the mechanisms involved in trogocytosis and may contribute to optimization of Ab-based immunotherapeutic approaches. PMID:20089699

  11. Silicosis in barium miners.

    PubMed Central

    Seaton, A; Ruckley, V A; Addison, J; Brown, W R

    1986-01-01

    Four men who mined barytes in Scotland and who developed pneumoconiosis are described. Three developed progressive massive fibrosis, from which two died; and one developed a nodular simple pneumoconiosis after leaving the industry. The radiological and pathological features of the men's lungs were those of silicosis and high proportions of quartz were found in two of them post mortem. The quartz was inhaled from rocks associated with the barytes in the mines. The features of silicosis in barium miners are contrasted with the benign pneumoconiosis, baritosis, that occurs in workers exposed to crushed and ground insoluble barium salts. Diagnostic difficulties arise when silicosis develops in workers mining minerals known to cause a separate and benign pneumoconiosis. These difficulties are compounded when, as not infrequently happens, the silicotic lesions develop or progress after exposure to quartz has ceased. Images PMID:3787542

  12. Taxation of mineral resources

    SciTech Connect

    Conrad, R.F.; Hool, R.B.

    1980-01-01

    There has been a substantial increase in recent years in the level of taxation imposed on mining firms by state and local governments. This increase can be attributed to three factors: (1) a heightened awareness that resources are limited in quantity; (2) environmental damage resulting from mining operations has brought demands for just compensations; and (3) significant price increases for some minerals have often been viewed by states as an opportunity to collect additional tax revenue. The broad aim of this book is to provide a comprehensive economic analysis of the effects of mining taxation on the extraction of mineral resources and to offer a set of recommendations for tax policy. The primary objective of this design is to minimize the distortionary incentives created by the taxation. From a practical standpoint, however, one must also recognize the degrees of difficulty in the administration of the various taxes. 90 references, 1 figure, 14 tables.

  13. Minerals and mine drainage

    SciTech Connect

    Liang, H.C.; Thomson, B.M. [Tetra Technical Inc, Denver, CO (United States)

    2009-09-15

    A review of literature published in 2008 and early 2009 on research related to the production of acid mine drainage and/or in the dissolution of minerals as a result of mining, with special emphasis on the effects of these phenomena on the water quality in the surrounding environment, is presented. This review is divided into six sections: 1) Site Characterization and Assessment, 2) Protection, Prevention, and Restoration, 3) Toxicity Assessment, 4) Environmental Fate and Transport, 5) Biological Characterization, and 6) Treatment Technologies. Because there is much overlap in research areas associated with minerals and mine drainage, many papers presented in this review can be classified into more than one category, and the six sections should not be regarded as being mutually-exclusive, nor should they be thought of as being all-inclusive.

  14. Mineral Requirements of Sheep.

    E-print Network

    Fraps, G. S. (George Stronach)

    1918-01-01

    constituents in feed, residues, and excrements were estimated. In connection with other digestion experiments, estimates were made of certain ash constituents in feeds, excrements and urine. The results of this work throw light upon the mineral requirements...,11 grams phosphoric acid. The ratio of lime to phosphoric acid in tri- calcium phosphate is 1 :0.80. Table 7.-Average magnesia eaten and digested. BALANCE EXPEBIMENTS In twenty tests with ten rations, the urine was analyzed in addition to the feeds...

  15. The Clay Minerals Society

    NSDL National Science Digital Library

    "The Clay Minerals Society (CMS) is an international community of scientists who promote research in and disseminate information on clay science and technology." The website provides downloads of materials dealing with various aspects of mineralogy, geochemistry, and petrology. Researchers can find out about annual meetings, awards and grants, and publications. Students and educators can find information on teaching materials, clay science workshops, and games. The website offers physical and chemical data for Source and Special Clays.

  16. Physical, chemical, and mineral properties of the Polonnaruwa stones

    NASA Astrophysics Data System (ADS)

    Wallis, Jamie; Wickramasinghe, N. C.; Wallis, Daryl H.; Miyake, Nori; Wallis, M. K.; Hoover, Richard B.; Samaranayake, Anil; Wickramarathne, Keerthi; Oldroyd, Anthony

    2013-09-01

    We report on the physical, chemical and mineral properties of a series of stone fragments recovered from the North Central Province of Sri Lanka following a witnessed fireball event on 29 December 2012. The stones exhibit highly porous poikilitic textures comprising of isotropic silica-rich/plagioclase-like hosts. Inclusions range in size and shape from mm-sized to smaller subangular grains frequently more fractured than the surrounding host and include ilmenite, olivine (fayalitic), quartz and accessory zircon. Bulk mineral compositions include accessory cristobalite, hercynite, anorthite, wuestite, albite, anorthoclase and the high pressure olivine polymorph wadsleyite, suggesting previous endurance of a shock pressure of ~20 GPa. Further evidence of shock is confirmed by the conversion of all plagioclase to maskelynite. Here the infrared absorption spectra in the region 580 cm-1 to 380 cm-1 due to the Si-O-Si or Si-O-Al absorption band shows a partial shift in the peak at 380 cm-1 towards 480 cm-1 indicating an intermediate position between crystalline and amorphous phase. Host matrix chemical compositions vary between samples, but all are rich in SiO2. Silica-rich melts display a heterogeneous K-enrichment comparable to that reported in a range of non-terrestrial material from rare iron meteorites to LL chondritic breccias and Lunar granites. Bulk chemical compositions of plagioclase-like samples are comparable to reported data e.g. Miller Ranger 05035 (Lunar), while Si-rich samples accord well with mafic and felsic glasses reported in NWA 1664 (Howardite) as well as data for fusion crust present in a variety of meteoritic samples. Triple oxygen isotope results show ?17O = -0.335 with ?18O (‰ rel. SMOW) values of 17.816 +/- 0.100 and compare well with those of known CI chondrites and are within the range of CI-like (Meta-C) chondrites. Rare earth elemental abundances show a profound Europium anomaly of between 0.7 and 0.9 ppm while CI normalized REE patterns accord well with those of high potassium and high aluminium glasses found in lunar and 4 Vesta samples. Twoelement discrimination maps of FeO vs SiO2, FeO vs TiO2, FeO vs Al2O3 and FeO vs Na2O similarly match those of impact glasses present in lunar samples and remain within relatively close proximity of the KREEP component. Iridium levels of between 1-7ppm, approximately 104 times that of terrestrial crustal rocks, were detected in all samples.

  17. Electron microprobe mineral analysis guide

    NASA Technical Reports Server (NTRS)

    Brown, R. W.

    1980-01-01

    Electron microprobe mineral analysis guide is a compilation of X-ray tables and spectra recorded from various mineral matrices. Spectra were obtained using electron microprobe, equipped with LiF geared, curved crystal X-ray spectrometers, utilizing typical analytical operating conditions: 15 Kv acceleration potential, 0.02 microampere sample current as measured on a clinopyroxene standard (CP19). Tables and spectra are presented for the majority of elements, fluorine through uranium, occurring in mineral samples from lunar, meteoritic and terrestrial sources. Tables for each element contain relevant analytical information, i.e., analyzing crystal, X-ray peak, background and relative intensity information, X-ray interferences and a section containing notes on the measurement. Originally intended to cover silicates and oxide minerals the tables and spectra have been expanded to cover other mineral phases. Electron microprobe mineral analysis guide is intended as a spectral base to which additional spectra can be added as the analyst encounters new mineral matrices.

  18. Accessory hepatic vein recanalization for treatment of Budd-Chiari syndrome due to long-segment obstruction of the hepatic vein: initial clinical experience

    PubMed Central

    Fu, Yu-Fei; Xu, Hao; Zhang, Ke; Zhang, Qing-Qiao; Wei, Ning

    2015-01-01

    PURPOSE We aimed to investigate the feasibility and effectiveness of accessory hepatic vein recanalization (balloon dilatation/stent insertion) for patients with Budd-Chiari syndrome (BCS) due to long-segment obstruction of the hepatic vein. METHODS From March 2010 to December 2013, 20 consecutive patients with BCS, due to long-segment obstruction of three hepatic veins, treated with accessory hepatic vein recanalization (11 males, 9 females; mean age, 33.4±10.9 years; range, 22–56 years) were included in this retrospective study. Data on technical success, clinical success, and follow-up were collected and analyzed. RESULTS Technical and clinical success was achieved in all patients. Each patient was managed with a single accessory hepatic vein recanalization procedure. No procedure-related complications occurred. The diameter of the accessory hepatic vein was 8.45±1.47 mm (6–11 mm) at the stem, and there were many collateral circulations between the hepatic vein and the accessory hepatic vein. The mean pressure of accessory hepatic vein decreased from 47.50±5.59 cm H2O before treatment to 28.80±3.47 cm H2O after treatment (P < 0.001). Abnormal levels of total bilirubin, albumin, aspartate aminotransferase, and alanine transaminase improved after the treatment. During the follow-up, three patients experienced restenosis or stenting of the accessory hepatic vein. CONCLUSIONS In BCS due to long-segment obstruction of the hepatic veins, it is important to confirm whether there is a compensatory accessory hepatic vein. For patients with a compensatory but obstructed accessory hepatic vein, recanalization is a simple, safe, and effective treatment option. PMID:25616271

  19. Hearing protection for miners

    SciTech Connect

    Schulz, T. [Sperian Hearing Protection (United States)

    2008-10-15

    A NIOSH analysis showed that at age 50 approximately 90% of coal miners have a hearing impairment, yet noise included hearing loss is 100% preventable. The article discusses requirements of the MSHA regulations, 30 CFR Part 62 - occupational noise exposure (2000) and a 2008-MSHA document describing technologically achievable and promising controls for several types of mining machinery. Hearing protection is still required for exposure to greater than 90 dBA. These are now commercially available ways to determine how much attenuation an individual gets from a given hearing protector, known as 'fit testing'. 3 refs., 1 fig., 1 tab., 1 photo.

  20. Microelectrophoresis of selected mineral particles

    NASA Technical Reports Server (NTRS)

    Herren, B. J.; Tipps, R. W.; Alexander, K. D.

    1982-01-01

    Particle mobilities of ilmenite, labradorite plagioclase, enstatite pyroxene, and olivine were measured with a Rank microelectrophoresis system to evaluate indicated mineral separability. Sodium bicarbonate buffer suspension media with and without additives (0.0001 M DTAB and 5 percent v/v ethylene glycol) were used to determine differential adsorption by mineral particles and modification of relative mobilities. Good separability between some minerals was indicated; additives did not enhance separability.

  1. MICROBIOLOGY: How Bacteria Respire Minerals

    NSDL National Science Digital Library

    Dianne K. Newman (California Institute of Technology; Division of Geological and Planetary Sciences)

    2001-05-18

    Access to the article is free, however registration and sign-in are required: Some bacteria respire minerals; that is, they harvest energy from minerals through using them as electron acceptors. Many details of this respiration process have remained obscure. In her Perspective, Newman highlights the study by Lower et al., who have used a customized atomic force microscope to observe bacteria during mineral respiration.

  2. Mineral Time Capsules on Mars?

    NASA Technical Reports Server (NTRS)

    Schirber, Michael

    2006-01-01

    Like dinosaur-age insects trapped in amber, biomolecules sequestered in million-year-old sulfate minerals could provide a glimpse into the past, say researchers who've recently analyzed such minerals from N orth America. The same minerals have recently been discovered on Mars , so they may be a good place to look for traces of past life on the red planet, the researchers say.

  3. 26 CFR 48.4063-2 - Tax-free sales of parts or accessories sold for resale on or in connection with the first retail...

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4063-2 Tax-free sales of parts or accessories sold for resale on or in connection with...

  4. 26 CFR 48.4063-2 - Tax-free sales of parts or accessories sold for resale on or in connection with the first retail...

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4063-2 Tax-free sales of parts or accessories sold for resale on or in connection with...

  5. 26 CFR 48.4063-2 - Tax-free sales of parts or accessories sold for resale on or in connection with the first retail...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4063-2 Tax-free sales of parts or accessories sold for resale on or in connection with...

  6. 26 CFR 48.4063-2 - Tax-free sales of parts or accessories sold for resale on or in connection with the first retail...

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...EXCISE TAXES MANUFACTURERS AND RETAILERS EXCISE TAXES Motor Vehicles, Tires, Tubes, Tread Rubber, and Taxable Fuel Automotive and Related Items § 48.4063-2 Tax-free sales of parts or accessories sold for resale on or in connection with...

  7. Next-generation re-sequencing as a tool for rapid bioinformatic screening of presence and absence of genes and accessory chromosomes across isolates of Zymoseptoria tritici.

    PubMed

    McDonald, Megan C; Williams, Angela H; Milgate, Andrew; Pattemore, Julie A; Solomon, Peter S; Hane, James K

    2015-06-01

    The wheat pathogen Zymoseptoria tritici possesses a large number of accessory chromosomes that may be present or absent in its genome. The genome of the reference isolate IPO323 has been assembled to a very high standard and contains 21 full length chromosome sequences, 8 of which represent accessory chromosomes. The IPO323 reference, when combined with low-cost next-generation sequencing and bioinformatics, can be used as a powerful tool to assess the presence or absence of accessory chromosomes. We present an outline of a range of bioinformatics techniques that can be applied to the analysis of presence-absence variation among accessory chromosomes across 13 novel isolates of Z. tritici. PMID:26092791

  8. Spiral CT During Selective Accessory Renal Artery Angiography: Assessment of Vascular Territory Before Aortic Stent-Grafting

    SciTech Connect

    Dorffner, Roland; Thurnher, Siegfried; Prokesch, Rupert; Youssefzadeh, Soraya [Department of Radiology, University of Vienna, AKH, Waehringer Guertel 18-20, A-1090 Vienna (Austria); Hoelzenbein, Thomas [Department of Vascular Surgery, University of Vienna, AKH, Waehringer Guertel 18-20, A-1090 Vienna (Austria); Lammer, Johannes [Department of Radiology, University of Vienna, AKH, Waehringer Guertel 18-20, A-1090 Vienna (Austria)

    1998-03-15

    We evaluated the vascular territory of accessory renal arteries in cases where the vessel might be overlapped by an aortic stent-graft. Spiral CT during selective accessory renal artery angiography was performed in four patients with abdominal aortic aneurysms (including one with a horseshoe kidney). The volume of the vascular territory of each renal artery was measured using a software program provided by the CT unit manufacturer. The supernumerary renal arteries perfused 32%, 37%, 15%, and 16% of the total renal mass, respectively. In two patients, stent-grafts were implanted, which resulted in occlusion of the supernumerary renal artery. The volume of the renal infarction was equal to the volume perfused by the artery as calculated before implantation of the stent-graft.The method proposed is accurate for estimating the size of the expected renal infarction. It might help to determine whether placement of a stent-graft is acceptable.

  9. Arthroscopic Broström repair with Gould augmentation via an accessory anterolateral port for lateral instability of the ankle.

    PubMed

    Matsui, Kentaro; Takao, Masato; Miyamoto, Wataru; Innami, Ken; Matsushita, Takashi

    2014-10-01

    Although several arthroscopic surgical techniques for the treatment of lateral instability of the ankle have been introduced recently, some concern remains over their procedural complexity, complications, and unclear clinical outcomes. We have simplified the arthroscopic technique of Broström repair with Gould augmentation. This technique requires only two small skin incisions for two ports (medial midline and accessory anterolateral ports), without needing a percutaneous procedure or extension of the skin incisions. The anterior talofibular ligament is reattached to its anatomical footprint on the fibula with suture anchor, under arthroscopic view. The inferior extensor retinaculum is directly visualized through the accessory anterolateral port and is attached to the fibula with another suture anchor under arthroscopic view via the anterolateral port. The use of two small ports offers a procedure that is simple to perform and less morbid for patients. PMID:25015792

  10. Presence of accessory penis, colonic duplication and several other congenital anomalies in a child: a very rare association.

    PubMed

    Chatterjee, Sayan; Mondal, Prabodh Chandra; Pandey, Shashi Bhushan; Achar, Arun

    2014-10-01

    An accessory penis is a very rare anomaly. Only five cases have been reported thus far to our knowledge. We present the case of a child aged 2 years and 10 months who had a penis-like structure (containing phallus and glans) attached to the right buttock. Associated anomalies were a non-communicating type of colonic duplication, a paramedian stenosed anal opening, a horse-shoe kidney, posterior urethral valves, scoliosis of the lumbo-sacral spine, polydactyly and equino-varus deformity of the right foot. As far as we can tell, this is the first report of an accessory penis associated with colonic duplication and other congenital anomalies. PMID:24705773

  11. Immune evasion activities of accessory proteins Vpu, Nef and Vif are conserved in acute and chronic HIV-1 infection.

    PubMed

    Mlcochova, Petra; Apolonia, Luis; Kluge, Silvia F; Sridharan, Aishwarya; Kirchhoff, Frank; Malim, Michael H; Sauter, Daniel; Gupta, Ravindra K

    2015-08-01

    Heterosexual HIV-1 transmission has been identified as a genetic bottleneck and a single transmitted/founder (T/F) variant with reduced sensitivity to type I interferon initiates productive infection in most cases. We hypothesized that particularly active accessory protein(s) may confer T/F viruses with a selective advantage in establishing HIV infection. Thus, we tested vpu, vif and nef alleles from six T/F and six chronic (CC) viruses in assays for 9 immune evasion activities involving the counteraction of interferon-stimulated genes and modulation of ligands known to activate innate immune cells. All functions were highly conserved with no significant differences between T/F and CC viruses, suggesting that these accessory protein functions are important throughout the course of infection. PMID:25827531

  12. Endocytic Accessory Proteins Are Functionally Distinguished by Their Differential Effects on the Maturation of Clathrin-coated Pits

    Microsoft Academic Search

    Marcel Mettlen; Miriam Stoeber; Dinah Loerke; Costin N. Antonescu; Gaudenz Danuser; Sandra L. Schmid

    2009-01-01

    Diverse cargo molecules (i.e., receptors and ligand\\/receptor complexes) are taken into the cell by clathrin-mediated endocytosis (CME) utilizing a core machinery consisting of cargo-specific adaptors, clathrin and the GTPase dynamin. Numerous endocytic accessory proteins are also required, but their differential roles and functional hierarchy during CME are not yet understood. Here, we used a combination of quantitative live-cell imaging by

  13. Developmental Mucin Gene Expression in the Gastroduodenal Tract and Accessory Digestive Glands. II. Duodenum and Liver, Gallbladder, and Pancreas

    Microsoft Academic Search

    Marie-Pierre Buisine; Louise Devisme; Pierre Degand; Marie-Claire Dieu; Bernard Gosselin; Marie-Christine Copin; Jean-Pierre Aubert; Nicole Porchet

    SUMMARY Studies were undertaken to provide information regarding cell-specific ex- pression of mucin genes and their relation to developmental and neoplastic patterns of ep- ithelial cytodifferentiation. In situ hybridization was used to study mRNA expression of mu- cin genes in duodenum and accessory digestive glands (liver, gallbladder, pancreas) of 13 human embryos and fetuses (6.5-27 weeks' gestation), comparing these with

  14. Gastrointestinal bleeding: an accessory spleen causing a false-positive Tc-99m-sulfur colloid study

    SciTech Connect

    Heyman, S.; Sunaryo, F.P.; Ziegler, M.M.

    1982-01-01

    A Tc-99m-sulfur colloid abdominal scan was performed on a 12-year-old girl to localize the site of gastrointestinal bleeding. The study was normal. When bleeding recurred two weeks later, a repeat study revealed a focal abnormality in the upper abdomen. This was thought to be compatible with a small bleed. However, at surgery an accessory spleen was found, accounting for the abnormal scan.

  15. A projection of displaced ganglion cells and giant ganglion cells to the accessory optic nuclei in turtle.

    PubMed

    Reiner, A

    1981-01-12

    The retinal projection to the accessory optic nuclei (AON) of turtles was found to arise from a distinctive set of giant ganglion cells whose dendrites ramify widely in outer portions of the inner plexiform layer. The majority (80%) of these cells had their perikaryon located in the ganglion cell layer, though displaced ganglion cells (DGCs) were also observed. In contrast, the retinal projection to the avian AON has been reported to arise exclusively from DGCs. PMID:7459635

  16. 36 CFR 293.14 - Mineral leases and mineral permits.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Preservation System. No person shall have any right or interest in or to any mineral deposits which may be discovered through prospecting or other information-gathering activity after the legal date on which the laws pertaining to mineral leasing cease...

  17. Netrin-guided accessory cell morphogenesis dictates the dendrite orientation and migration of a Drosophila sensory neuron

    PubMed Central

    Mrkusich, Eli M.; Osman, Zalina B.; Bates, Karen E.; Marchingo, Julia M.; Duman-Scheel, Molly; Whitington, Paul M.

    2010-01-01

    Accessory cells, which include glia and other cell types that develop in close association with neurons, have been shown to play key roles in regulating neuron development. However, the underlying molecular and cellular mechanisms remain poorly understood. A particularly intimate association between accessory cells and neurons is found in insect chordotonal organs. We have found that the cap cell, one of two accessory cells of v'ch1, a chordotonal organ in the Drosophila embryo, strongly influences the development of its associated neuron. As it projects a long dorsally directed cellular extension, the cap cell reorients the dendrite of the v'ch1 neuron and tows its cell body dorsally. Cap cell morphogenesis is regulated by Netrin-A, which is produced by epidermal cells at the destination of the cap cell process. In Netrin-A mutant embryos, the cap cell forms an aberrant, ventrally directed process. As the cap cell maintains a close physical connection with the tip of the dendrite, the latter is dragged into an abnormal position and orientation, and the neuron fails to undergo its normal dorsal migration. Misexpression of Netrin-A in oenocytes, secretory cells that lie ventral to the cap cell, leads to aberrant cap cell morphogenesis, suggesting that Netrin-A acts as an instructive cue to direct the growth of the cap cell process. The netrin receptor Frazzled is required for normal cap cell morphogenesis, and mutant rescue experiments indicate that it acts in a cell-autonomous fashion. PMID:20530550

  18. Mitogenic activation of B cells in vitro: the properties of adherent accessory cells as revealed by partition analysis.

    PubMed

    Kettman, J R; Soederberg, A; Lefkovits, I

    1986-08-15

    The requirement of B cells activated by mitogen (dextran sulfate plus lipopolysaccharide) for accessory cells was studied by partition analysis. Small numbers of splenic B cells were activated to clonal growth, as determined by visual inspection, and to immunoglobulin (Ig) synthesis, as determined by release of Ig into the culture fluid. By placing irradiated adherent cells in the periphery of the microculture wells and forcing responding cells to different areas of the well (slant experiments), it was observed that no cell contact was necessary for B cell activation, and that "promoted" contact ("Rock and Roll" experiments) does not increase the efficiency of activation. Sequential microcultures suggest that only some irradiated adherent cells act as accessory cells, but they can perform this function to more than one B cell. Attempts to perform limiting dilution analysis by varying irradiated adherent cell input showed non-single-hit behavior. When the data were rearranged, taking into account the distribution of irradiated adherent cells, then single-hit behavior with about 1 to 5% of irradiated adherent cells acting as an accessory cells for B cell clonal activation was observed. The evidence suggests that an uncommon irradiated adherent cell releases a soluble factor necessary for B cell activation and/or clonal proliferation. PMID:3488344

  19. Induction of rainbow trout MH class I and accessory proteins by viral haemorrhagic septicaemia virus.

    PubMed

    Sever, Lital; Vo, Nguyen T K; Lumsden, John; Bols, Niels C; Dixon, Brian

    2014-06-01

    Major histocompatibility (MH) class I receptors are glycoproteins which play a critical role during responses to intracellular pathogens by presenting endogenous peptides to cytotoxic T cell lymphocytes (CD8+). To date, little is known about MH class I regulation at the protein level during viral infections in fish. In this study, we characterised the MH class I pathway response to polyinosinic-polycytidylic acid (poly I:C) and upon infection with viral haemorrhagic septicemia virus (VHSV) genotype IVa using the rainbow trout monocyte/macrophage cell line RTS11. A 14-day challenge with VHSV IVa at 14°C demonstrated enhanced expression of the class I heavy chain, ?2 microglobulin (?2M) and tapasin, while the expression of other accessory molecules ERp57 and calreticulin remained unchanged. However, when infection occurred at 2°C no change in expression levels of any of these molecules was observed. ?2M accumulated in the media of RTS11 over time, however the ?2M concentrations were 2 fold higher in cultures infected with VHSV 14 days post infection. Strikingly, when cells were maintained at 2°C the secretion of ?2M was significantly reduced in both infected and non-infected cultures. These results indicate that VHSV infection alters the kinetics of ?2M release as well as the expression of MH class I and suggests that cellular immunity against VHSV can be compromised at low temperatures which may increase host susceptibility to this virus during the winter. PMID:24607971

  20. Ultrasonographic Visualization of Accessory Hepatic Veins and Their Lesions in Budd-Chiari Syndrome.

    PubMed

    Cai, Shi-Feng; Gai, Yong-Hao; Ma, Shuang; Liang, Bo; Wang, Guang-Chuan; Liu, Qing-Wei

    2015-08-01

    The aim of this study was to investigate the ultrasonographic features of accessory hepatic veins (AHVs) and their lesions in Budd-Chiari syndrome (BCS). Three hundred patients with BCS were examined by ultrasonography with multifrequency (3-6 MHz) convex transducers. Sonography was performed 1 to 2 wk before digital subtraction angiography and computed tomography angiography or magnetic resonance imaging. Using sonograms, we evaluated the number, course, diameter, orifice, lesions and hemodynamics of patent and obstructed AHVs. Ultrasonography was superior to digital subtraction angiography, computed tomography angiography and magnetic resonance imaging in revealing AHV lesions and hemodynamics. Dilated AHVs were detected in 227 patients. There were 239 caudate lobe veins in 167 patients and 168 inferior right hepatic veins in 151 patients. Both caudate lobe veins and inferior right hepatic veins were found in 91 of the 227 patients. The inlets to AHVs were located mainly on the right lateral or right anterior wall of the inferior vena cava, and the remnant, on the left lateral wall. AHV lesions comprised mainly septal obstruction and segmental stenosis. The hemodynamics of AHVs varied with the condition of inferior vena cava and AHVs. Ultrasonic examination can reveal AHVs and their lesions in patients with BCS and is helpful in choosing and planning therapeutic approaches. PMID:25952161

  1. Expression and immunogenicity analysis of accessory colonization factor A from Vibrio alginolyticus strain HY9901.

    PubMed

    Cai, Shuang-Hu; Huang, Yu-Cong; Lu, Yi-Shan; Wu, Zao-He; Wang, Bei; Tang, Ju-Fen; Jian, Ji-Chang

    2013-02-01

    The accessory colonization factor A (ACFA) of Vibrio alginolyticus plays an important role in the efficient colonization of the bacterium and is potential candidates for vaccine development. In present study, the acfA gene was cloned, expressed and purified. Western blot analysis revealed protein recognition with the native ACFA in different V. alginolyticus strains. To analyze the immunogenicity of the recombinant ACFA, Lutjanus erythropterus Bloch were immunized by intraperitoneal injection, and the results demonstrated that the recombinant ACFA produced an observable antibody response in all sera of the vaccinated fish. The differential expressions of RAG1 gene in various tissues of L. erythropterus were analyzed by fluorescent quantitative real-time PCR, and the results showed the RAG1 mRNA expression was significantly up-regulated in thymus, head kidney and spleen tissue. Furthermore, the protective property of recombinant ACFA was evaluated through challenge with six heterogeneous virulent V. alginolyticus strains, and the immunohistochemical analysis in different tissues after challenge with V. alginolyticus. The results showed L. erythropterus vaccinated with recombinant ACFA were more tolerant of the infection by virulent V. alginolyticus strains. The data indicate that the recombinant ACFA could provide heterologous protection for the different virulent V. alginolyticus strains. PMID:23261505

  2. Activation of human CD4+45RA+ T cells using B cells as accessory cells.

    PubMed

    Kristensson, K; Kristensen, L; Borrebaeck, C A; Carlsson, R

    1994-03-01

    Human naive CD4+ T cells, as defined by expression of CD45RA and lack of CD45R0, can be activated in vitro using B cells as accessory cells. CD4+CD45RA+ T cells proliferate, as determined by [3H]thymidine or bromodeoxyuridine (BrdU) incorporation, after activation with the superantigen staphylococcal enterotoxin A (SEA) presented by major histocompatibility complex class II-expressing B cells. The identity of the responding cells as being CD45RA+ and not contaminating CD45R0+ T cells was determined by FACS analysis, showing that purified CD45RA-expressing T-helper cells went into S phase and progressively acquired expression of the CD45R0 isoform while simultaneously losing expression of the CD45RA isoform. Cultivation of the CD4+ T-cell subsets under limiting dilution conditions supported these findings and revealed that (i) the frequency of responding cells in the CD45RA+ population was equal to or higher than in the CD45R0+ subset and (ii) that the number of CD45R0+ cells possibly contaminating the CD45RA population was too low to be able to account for the response observed. PMID:7913456

  3. Adaptive Evolution of Recently Duplicated Accessory Gland Protein Genes in Desert Drosophila

    PubMed Central

    Wagstaff, Bradley J.; Begun, David J.

    2007-01-01

    The relationship between animal mating system variation and patterns of protein polymorphism and divergence is poorly understood. Drosophila provides an excellent system for addressing this issue, as there is abundant interspecific mating system variation. For example, compared to D. melanogaster subgroup species, repleta group species have higher remating rates, delayed sexual maturity, and several other interesting differences. We previously showed that accessory gland protein genes (Acp's) of Drosophila mojavensis and D. arizonae evolve more rapidly than Acp's in the D. melanogaster subgroup and that adaptive Acp protein evolution is likely more common in D. mojavensis/D. arizonae than in D. melanogaster/D. simulans. These findings are consistent with the idea that greater postcopulatory selection results in more adaptive evolution of seminal fluid proteins in the repleta group flies. Here we report another interesting evolutionary difference between the repleta group and the D. melanogaster subgroup Acp's. Acp gene duplications are present in D. melanogaster, but their high sequence divergence indicates that the fixation rate of duplicated Acp's has been low in this lineage. Here we report that D. mojavensis and D. arizonae genomes contain several very young duplicated Acp's and that these Acp's have experienced very rapid, adaptive protein divergence. We propose that rapid remating of female desert Drosophila generates selection for continuous diversification of the male Acp complement to improve male fertilization potential. Thus, mating system variation may be associated with adaptive protein divergence as well as with duplication of Acp's in Drosophila. PMID:17720912

  4. Essential versus accessory aspects of cell death: recommendations of the NCCD 2015

    PubMed Central

    Galluzzi, L; Bravo-San Pedro, J M; Vitale, I; Aaronson, S A; Abrams, J M; Adam, D; Alnemri, E S; Altucci, L; Andrews, D; Annicchiarico-Petruzzelli, M; Baehrecke, E H; Bazan, N G; Bertrand, M J; Bianchi, K; Blagosklonny, M V; Blomgren, K; Borner, C; Bredesen, D E; Brenner, C; Campanella, M; Candi, E; Cecconi, F; Chan, F K; Chandel, N S; Cheng, E H; Chipuk, J E; Cidlowski, J A; Ciechanover, A; Dawson, T M; Dawson, V L; De Laurenzi, V; De Maria, R; Debatin, K-M; Di Daniele, N; Dixit, V M; Dynlacht, B D; El-Deiry, W S; Fimia, G M; Flavell, R A; Fulda, S; Garrido, C; Gougeon, M-L; Green, D R; Gronemeyer, H; Hajnoczky, G; Hardwick, J M; Hengartner, M O; Ichijo, H; Joseph, B; Jost, P J; Kaufmann, T; Kepp, O; Klionsky, D J; Knight, R A; Kumar, S; Lemasters, J J; Levine, B; Linkermann, A; Lipton, S A; Lockshin, R A; López-Otín, C; Lugli, E; Madeo, F; Malorni, W; Marine, J-C; Martin, S J; Martinou, J-C; Medema, J P; Meier, P; Melino, S; Mizushima, N; Moll, U; Muñoz-Pinedo, C; Nuñez, G; Oberst, A; Panaretakis, T; Penninger, J M; Peter, M E; Piacentini, M; Pinton, P; Prehn, J H; Puthalakath, H; Rabinovich, G A; Ravichandran, K S; Rizzuto, R; Rodrigues, C M; Rubinsztein, D C; Rudel, T; Shi, Y; Simon, H-U; Stockwell, B R; Szabadkai, G; Tait, S W; Tang, H L; Tavernarakis, N; Tsujimoto, Y; Vanden Berghe, T; Vandenabeele, P; Villunger, A; Wagner, E F; Walczak, H; White, E; Wood, W G; Yuan, J; Zakeri, Z; Zhivotovsky, B; Melino, G; Kroemer, G

    2015-01-01

    Cells exposed to extreme physicochemical or mechanical stimuli die in an uncontrollable manner, as a result of their immediate structural breakdown. Such an unavoidable variant of cellular demise is generally referred to as ‘accidental cell death' (ACD). In most settings, however, cell death is initiated by a genetically encoded apparatus, correlating with the fact that its course can be altered by pharmacologic or genetic interventions. ‘Regulated cell death' (RCD) can occur as part of physiologic programs or can be activated once adaptive responses to perturbations of the extracellular or intracellular microenvironment fail. The biochemical phenomena that accompany RCD may be harnessed to classify it into a few subtypes, which often (but not always) exhibit stereotyped morphologic features. Nonetheless, efficiently inhibiting the processes that are commonly thought to cause RCD, such as the activation of executioner caspases in the course of apoptosis, does not exert true cytoprotective effects in the mammalian system, but simply alters the kinetics of cellular demise as it shifts its morphologic and biochemical correlates. Conversely, bona fide cytoprotection can be achieved by inhibiting the transduction of lethal signals in the early phases of the process, when adaptive responses are still operational. Thus, the mechanisms that truly execute RCD may be less understood, less inhibitable and perhaps more homogeneous than previously thought. Here, the Nomenclature Committee on Cell Death formulates a set of recommendations to help scientists and researchers to discriminate between essential and accessory aspects of cell death. PMID:25236395

  5. Social cues of sperm competition influence accessory reproductive gland size in a promiscuous mammal

    PubMed Central

    Lemaître, Jean-François; Ramm, Steven A.; Hurst, Jane L.; Stockley, Paula

    2011-01-01

    Theory predicts that males should increase overall investment in ejaculate expenditure with increasing levels of sperm competition. Since ejaculate production is costly, we may expect males to tailor their reproductive investment according to anticipated levels of sperm competition. Here, we investigate plasticity in ejaculate investment in response to cues of population average levels of sperm competition in a promiscuous mammal, the bank vole (Myodes glareolus). We manipulated the social experience of experimental subjects during sexual development via differential exposure to the odour of rival males, to simulate conditions associated with relatively high or low average levels of sperm competition. Males exposed to a high level of competition developed larger major accessory reproductive glands (seminal vesicles) than those that experienced a low level of competition, suggesting that an increased investment in the production of copulatory plugs and/or mating rate may be beneficial at relatively high sperm competition levels. However, investment in sperm production, testis size and sperm motility were not altered according to social experience. Our findings emphasize the importance of non-sperm components of the ejaculate in mammalian postcopulatory sexual selection, and add to the growing evidence linking plasticity in reproductive traits to social cues of sperm competition. PMID:20880887

  6. Nutrition regulation of male accessory gland growth and maturation in Tribolium castaneum.

    PubMed

    Xu, Jingjing; Anciro, Ashlee L; Palli, Subba Reddy

    2015-01-01

    Insulin/IGF-1 signaling (IIS) pathway is known to control growth, development and reproduction. Insulin-like peptide mediated body size plasticity in Drosophila melanogaster has been reported. Here, our studies showed that IIS pathway and nutrition regulate growth and maturation of the male accessory gland (MAG) in the red flour beetle, Tribolium castaneum. The size of MAG increased from day 1 to day 5 post-adult emergence (PAE). This increase in the size of MAG is contributed by an increase in cell size, but not cell number. The growth of MAG was impaired after double-stranded RNA (dsRNA)-mediated knockdown in the expression of genes coding for ILP3, InR, Chico, PI3k, AKT, and GATA1 involved in IIS pathway. Interestingly, starvation showed similar effects on the growth and maturation of MAG. The phenotypes observed in animals where IIS signaling pathway genes were knocked down are similar to the phenotypes observed after starving beetles for 5 days PAE. These data suggest that nutrition signals working through IIS pathway regulate maturation of MAG by promoting the growth of MAG cells. PMID:26035685

  7. Prevalence of human papilloma virus infection in patients with male accessory gland infection.

    PubMed

    La Vignera, S; Vicari, E; Condorelli, R A; Franchina, C; Scalia, G; Morgia, G; Perino, A; Schillaci, R; Calogero, A E

    2015-04-01

    The frequency of human papillomavirus (HPV) infection in the semen of patients with male accessory gland infection (MAGI) was evaluated. One hundred infertile patients with MAGI were classified into group A: patients with an inflammatory MAGI (n = 48) and group B: patients with a microbial form (n = 52). Healthy age-matched fertile men (34.0 ± 4.0 years) made up the control group (n = 20). Amplification of HPV DNA was carried out by HPV-HS Bio nested polymerase chain reaction for the detection of HPV DNA sequences within the L1 ORF. Ten patients in group A (20.8%) and 15 patients in group B (28.8%) had a HPV infection; two controls (10.0%) had HPV infection. Patients with MAGI had a significantly higher frequency of HPV infection compared with controls; patients with a microbial MAGI had significantly higher frequency of HPV infection compared with patients with an inflammatory form (both P < 0.05). Patients with MAGI and HPV had a slight, but significantly lower sperm progressive motility and normal morphology compared with patients with MAGI HPV-negative (P < 0.05). Elevated frequency of HPV infection occurred in patients with MAGI, suggesting that HPV should be investigated in the diagnostic work-up of these patients. PMID:25684094

  8. Male accessory gland inflammation prevalence in type 2 diabetic patients with symptoms possibly reflecting autonomic neuropathy

    PubMed Central

    Condorelli, Rosita A; Vicari, Enzo; Calogero, Aldo E; La Vignera, Sandro

    2014-01-01

    Male accessory gland inflammation or infection (MAGI) is a potentially underdiagnosed complication of type 2 diabetes (DM2); specifically, we reported in a recent study that the frequency of MAGI was 43% among DM2 patients. In previous studies, we have demonstrated that diabetic autonomic neuropathy (DAN) is associated with a peculiar ultrasound characterization of the seminal vesicles (SVs) in DM2 patients. The aim of the present study was to evaluate the frequency of MAGI in two different categories of DM2 patients (i.e. patients with and without symptoms that possibly reflect DAN) and the respective ultrasound characterizations. Sixty DM2 patients with a mean (± s.e.m.) age of 42.0 ± 6.0 years (range: 34–47 years) were classified according to the presence or the absence of symptoms that could possibly reflect DAN (group A: DM2 with symptoms possibly reflecting DAN, n = 28 patients and group B: DM2 without symptoms possibly reflecting DAN, n = 32 patients). The patients in Group A exhibited a significantly higher frequency of MAGI compared with those in group B patients (P < 0.05); moreover, the Group A patients exhibited a significantly higher frequency of ultrasound signs suggestive of vesiculitis (P < 0.05). Finally, the concentrations of lymphocytes but not the concentrations of the leukocytes in the semen were significantly higher (P < 0.05) in group A compared with group B. PMID:24799635

  9. Structural And Biological Analysis of the Metal Sites of Escherichia Coli Hydrogenase Accessory Protein

    SciTech Connect

    Dias, A.V.; Mulvihill, C.M.; Leach, M.R.; Pickering, I.J.; George, G.N.; Zamble, D.B.

    2009-05-12

    The [NiFe]-hydrogenase protein produced by many types of bacteria contains a dinuclear metal center that is required for enzymatic activity. Assembly of this metal cluster involves the coordinated activity of a number of helper proteins including the accessory protein, HypB, which is necessary for Ni(II) incorporation into the hydrogenase proteins. The HypB protein from Escherichia coli has two metal-binding sites, a high-affinity Ni(II) site that includes ligands from the N-terminal domain and a low-affinity metal site located within the C-terminal GTPase domain. In order to determine the physiological relevance of the two separate sites, hydrogenase production was assessed in strains of E. coli expressing wild-type HypB, the isolated GTPase domain, or site-directed mutants of metal-binding residues. These experiments demonstrate that both metal sites of HypB are critical for the maturation of the hydrogenase enzymes in E. coli. X-ray absorption spectroscopy of purified proteins was used to examine the detailed coordination spheres of each nickel-loaded site. In addition, because the low-affinity metal site has a stronger preference for Zn(II) than Ni(II), the ligands and geometry for this metal were also resolved. The results from these experiments are discussed in the context of a mechanism for Ni(II) insertion into the hydrogenase protein.

  10. Posterior approach for accessory-suprascapular nerve transfer: an electrophysiological outcomes study.

    PubMed

    Rui, J; Zhao, X; Zhu, Y; Gu, Y; Lao, J

    2013-03-01

    The aim of this study was to retrospectively investigate the electrophysiological results obtained after employing the posterior approach for spinal accessory nerve-suprascapular nerve (SAN-SSN) transfer, and to compare this with the traditional anterior approach. SAN-SSN transfer was performed in 74 patients with brachial plexus injury. The posterior approach was used in 35 patients and the anterior approach was used in 39 patients. Electrophysiological examination was conducted and analyzed postoperatively. There was no significant difference between approaches in the time it took for the infraspinatus to show low-incidence motor unit action potentials (MUAPs) and an incomplete interference pattern. In addition, the final ratio of patients that showed regeneration potential of the infraspinatus was not significantly different between the approaches. Furthermore, latency and wave amplitude showed a linear regression with post-operative time in the posterior approach group. In the posterior approach group, the final abduction of the shoulder was positively correlated with the amplitude. The posterior approach for SAN-SSN is an effective potential alternative technique that may be appropriate for some clinical situations. PMID:22618552

  11. Improving Cattle Health Through Trace Mineral Supplementation

    Microsoft Academic Search

    Jerry W. Spears

    1995-01-01

    A number of trace minerals are required by beef cattle. Feeds consumed by cattle may supply most trace minerals in adequate amounts. However, some minerals may be severely or at least marginally deficient in beef cattle diets. Even marginal mineral deficiencies can reduce growth, reproduction and\\/or health of cattle showing few if any clinical signs of deficiency. Other trace minerals

  12. Marine Mineral Exploration

    NASA Astrophysics Data System (ADS)

    Spiess, Fren N.

    This book is the forty-first in the Elsevier Oceanography Series, and with it the series has come full circle. Its first title, published in 1964, was John Mero's landmark study The Mineral Resources of the Sea [Mero, 1964]. Looking back at that first major treatise and comparing it with this and other recent books on the topic [e.g., Teleki et al., 1987] one cannot help but be impressed with how well Mero used the sparse data and studies that had been put together by his time. Twenty-two years and many millions of dollars later a substantial mining-oriented base of knowledge has been built — we know much more about the economics and the engineering — yet the basic premises and conclusions that Mero assembled are still intact, and answers to the fundamental questions (e.g., formation processes for manganese nodules) are not in much better condition than they were then.

  13. The minerals of milk.

    PubMed

    Gaucheron, Frédéric

    2005-01-01

    The salt of milk constitutes a small part of milk (8-9 g.L(-1)); this fraction contains calcium, magnesium, sodium and potassium for the main cations and inorganic phosphate, citrate and chloride for the main anions. In milk, these ions are more or less associated between themselves and with proteins. Depending on the type of ion, they are diffusible (cases of sodium, potassium and chloride) or partially associated with casein molecules (cases of calcium, magnesium, phosphate and citrate), to form large colloidal particles called casein micelles. Today, our knowledge and understanding concerning this fraction is relatively complete. In this review, the different models explaining (i) the nature and distribution of these minerals (especially calcium phosphate) in both fractions of milk and (ii) their behaviour in different physico-chemical conditions, are discussed. PMID:16045895

  14. Longwall mineral mining installation

    SciTech Connect

    Beyer, H.; Erwien, H.; Grundken, D.; Kerklies, B.; Kumor, B.; Linke, H.; Mainusch, R.; Mohn, U.; Wleklinski, B.

    1983-06-21

    A mineral mining installation comprises a longwall conveyor, a plough movable to and fro along a guide fixed to the face side of the longwall conveyor, and a drive station at one end of the longwall conveyor. The drive station includes a drive frame supporting drive means for driving the longwall conveyor. A support beam is provided at the goaf side of the drive station. The support beam extends substantially parallel to the drive frame. A floor plate extends beneath the drive frame. The goafside end portion of the floor plate is supported on the support beam by means of a lifting device, whereby the goaf-side end portion of the floor plate can be moved up and down relative to the support beam by the lifting device.

  15. The Mineral Physics Committee

    NASA Astrophysics Data System (ADS)

    Mineral Physics Committee members for the period July 1, 1986, to J ne 30, 1988, have been announced. They are Murli H. Manghnani (Hawaii Institute of Geophysics, Honolulu), and Orson L. Anderson (University of California, Los Angeles), Thomas J. Ahrens (California Institute of Technology, Pasadena, Calif.), Subir K. Banerjee (University of Minnesota, Minneapolis), William A. Bassett (Cornell University, Ithaca, N.Y.), Gordon E. Brown, Jr. (Stanford University, Stanford, Calif.), Michael Brown (University of Washington, Seattle), Robert M. Hazen (Geophysical Laboratory, Washington, D.C.), Raymond F. Jeanloz (University of California, Berkeley), Robert C. Liebermann (State University of New York (SUNY),(Stony Brook), Alexandra Navrotsky (Princeton University, Princeton, N.J.), Robert N. Schock (Lawrence Livermore National Laboratory, Livermore, Calif.), and Donald J. Weidner (SUNY Stony Brook).

  16. Rare earths and other trace elements in minerals from skarn assemblages, Hillside iron oxide-copper-gold deposit, Yorke Peninsula, South Australia

    NASA Astrophysics Data System (ADS)

    Ismail, Roniza; Ciobanu, Cristiana L.; Cook, Nigel J.; Teale, Graham S.; Giles, David; Mumm, Andreas Schmidt; Wade, Benjamin

    2014-01-01

    The Hillside Cu-(Au) deposit, Yorke Peninsula, South Australia, is a recently-discovered ore system within the 1.6 Ga World-class Olympic iron oxide-copper-gold (IOCG) Province. The deposit is characterized by a skarn-style alteration zone. Analyses of feldspar, calcite, skarn minerals (garnet, pyroxene, clinozoisite and actinolite) and accessories (titanite, apatite and allanite), and grain-scale element mapping by laser-ablation inductively-coupled plasma mass spectrometry are used to assess the distributions of rare earth element (REE), incompatible and ore-forming elements in host rocks, prograde and retrograde skarn.

  17. Mineral Cleavage: a practical experiment

    NSDL National Science Digital Library

    Sharon Browning

    In this geology activity, students investigate the physical property of mineral cleavage by physically trying to break down a block of halite and describing the results. This lab addresses many misunderstandings non-majors have about the physical properties of minerals and includes a brief write up of their conclusions.

  18. Institute for Mineral and Energy

    E-print Network

    to 10 per cent per annum while other minerals such as uranium and rare earth elements will become to enhance the prospectivity, discovery and extraction of mineral and energy resources, including petroleum fields of research are: · Earth Sciences ­ geology; geochemistry; geo-sequestration; geophysics

  19. From Mountain Men to Miners.

    ERIC Educational Resources Information Center

    Stevens, Robert L.; Fogel, Jared A.

    1999-01-01

    Examines three of the changes wrought by coal mining: (1) the miner's working conditions; (2) the establishment of company towns; and (3) the violence that ensued when miners from Harlan County, Kentucky, referred to as "Bloody Harlan," tried to better their lives by joining labor unions. (CMK)

  20. Investigating Minerals: Promoting Integrated Inquiry

    ERIC Educational Resources Information Center

    Thompson, Rudi; Carmack, Elizabeth

    2007-01-01

    "Mineral Detectives!" is one of eighteen lessons in the "Private Whys?" integrated science unit, which uses a guided inquiry investigation to teach students in grades three through five about the role of minerals in our lives. The University of North Texas developed "Private Whys?" with funding from the Copper Development Association. This lesson…