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Sample records for acido 1-ascorbico como

  1. Evaluations of Tumor Acidosis Within In Vivo Tumor Models Using Parametric Maps Generated with AcidoCEST MRI

    PubMed Central

    Chen, Liu Qi; Randtke, Edward A.; Jones, Kyle M.; Moon, Brianna F.; Howison, Christine M.; Pagel, Mark D.

    2016-01-01

    Purpose We aimed to develop pixelwise maps of tumor acidosis to aid in evaluating extracellular tumor pH (pHe) in cancer biology. Procedures MCF-7 and MDA-MB-231 mouse models were imaged during a longitudinal study. AcidoCEST MRI and a series of image processing methods were used to produce parametric maps of tumor pHe, and tumor pHe was also measured with a pH microsensor. Results Sufficient contrast-to-noise for producing pHe maps was achieved by using standard image processing methods. A comparison of pHe values measured with acidoCEST MRI and a pH microsensor showed that acidoCEST MRI measured tumor pHe with an accuracy of 0.034 pH units. The MCF-7 tumor model was found to be more acidic compared to the MDA-MB-231 tumor model. The pHe was not related to tumor size during the longitudinal study. Conclusions These results show that acidoCEST MRI can create pixelwise tumor pHe maps of mouse models of cancer. PMID:25622809

  2. Some Biochemical Properties of an Acido-Thermophilic Archae-Bacterium Sulfolobus Acidocaldarius

    NASA Astrophysics Data System (ADS)

    Oshima, Tairo; Ohba, Masayuki; Wagaki, Takayoshi

    1984-12-01

    To elucidate the phylogenic status of archaebacteria, some basic cellular components of an acido-thermophilic archaebacterium,Sulfolobus acidocaldarius, were studied. Poly(A) containing RNA was present in the cells, and performed the role of mRNA in a cell-free extract of reticulocyte or the archaebacteria. Poly(A) containing RNA was also found in other archaebacterial cells. The absence of cap structure was suggested in these RNAs. The cell-free protein synthesis using the archaebacterial extract was inhibited by anisomycin, a specific inhibitor for eukaryotic ribosomes. Two unique membrane-bound ATPases were detected. Based on resistance to H+-ATPase inhibitors, these enzymes seemed not to be F0F1-ATPase.

  3. Assessing Metabolic Changes in Response to mTOR Inhibition in a Mantle Cell Lymphoma Xenograft Model Using AcidoCEST MRI

    PubMed Central

    Akhenblit, Paul J.; Hanke, Neale T.; Gill, Alexander; Persky, Daniel O.; Howison, Christine M.; Pagel, Mark D.; Baker, Amanda F.

    2016-01-01

    AcidoCEST magnetic resonance imaging (MRI) has previously been shown to measure tumor extracellular pH (pHe) with excellent accuracy and precision. This study investigated the ability of acidoCEST MRI to monitor changes in tumor pHe in response to therapy. To perform this study, we used the Granta 519 human mantle cell lymphoma cell line, which is an aggressive B-cell malignancy that demonstrates activation of the phosphatidylinositol-3-kinase/Akt/mammalian target of rapamycin (mTOR) pathway. We performed in vitro and in vivo studies using the Granta 519 cell line to investigate the efficacy and associated changes induced by the mTOR inhibitor, everolimus (RAD001). AcidoCEST MRI studies showed a statistically significant increase in tumor pHe of 0.10 pH unit within 1 day of initiating treatment, which foreshadowed a decrease in tumor growth of the Granta 519 xenograft model. AcidoCEST MRI then measured a decrease in tumor pHe 7 days after initiating treatment, which foreshadowed a return to normal tumor growth rate. Therefore, this study is a strong example that acidoCEST MRI can be used to measure tumor pHe that may serve as a marker for therapeutic efficacy of anticancer therapies. PMID:27140422

  4. Assessing Metabolic Changes in Response to mTOR Inhibition in a Mantle Cell Lymphoma Xenograft Model Using AcidoCEST MRI.

    PubMed

    Akhenblit, Paul J; Hanke, Neale T; Gill, Alexander; Persky, Daniel O; Howison, Christine M; Pagel, Mark D; Baker, Amanda F

    2016-01-01

    AcidoCEST magnetic resonance imaging (MRI) has previously been shown to measure tumor extracellular pH (pHe) with excellent accuracy and precision. This study investigated the ability of acidoCEST MRI to monitor changes in tumor pHe in response to therapy. To perform this study, we used the Granta 519 human mantle cell lymphoma cell line, which is an aggressive B-cell malignancy that demonstrates activation of the phosphatidylinositol-3-kinase/Akt/mammalian target of rapamycin (mTOR) pathway. We performed in vitro and in vivo studies using the Granta 519 cell line to investigate the efficacy and associated changes induced by the mTOR inhibitor, everolimus (RAD001). AcidoCEST MRI studies showed a statistically significant increase in tumor pHe of 0.10 pH unit within 1 day of initiating treatment, which foreshadowed a decrease in tumor growth of the Granta 519 xenograft model. AcidoCEST MRI then measured a decrease in tumor pHe 7 days after initiating treatment, which foreshadowed a return to normal tumor growth rate. Therefore, this study is a strong example that acidoCEST MRI can be used to measure tumor pHe that may serve as a marker for therapeutic efficacy of anticancer therapies. PMID:27140422

  5. Respiration gating and Bloch fitting improve pH measurements with acidoCEST MRI in an ovarian orthotopic tumor model

    PubMed Central

    Jones, Kyle M; Randtke, Edward A; Howison, Christine M; Pagel, Mark D

    2016-01-01

    We have developed a MRI method that can measure extracellular pH in tumor tissues, known as acidoCEST MRI. This method relies on the detection of Chemical Exchange Saturation Transfer (CEST) of iopamidol, an FDA-approved CT contrast agent that has two CEST signals. A log10 ratio of the two CEST signals is linearly correlated with pH, but independent of agent concentration, endogenous T1 relaxation time, and B1 inhomogeneity. Therefore, detecting both CEST effects of iopamidol during in vivo studies can be used to accurately measure the extracellular pH in tumor tissues. Past in vivo studies using acidoCEST MRI have suffered from respiration artifacts in orthotopic and lung tumor models that have corrupted pH measurements. In addition, the non-linear fitting method used to analyze results is unreliable as it is subject to over-fitting especially with noisy CEST spectra. To improve the technique, we have recently developed a respiration gated CEST MRI pulse sequence that has greatly reduced motion artifacts, and we have included both a prescan and post scan to remove endogenous CEST effects. In addition, we fit the results by parameterizing the contrast of the exogenous agent with respect to pH via the Bloch equations modified for chemical exchange, which is less subject to over-fitting than the non-linear method. These advances in the acidoCEST MRI technique and analysis methods have made pH measurements more reliable, especially in areas of the body subject to respiratory motion. PMID:27212783

  6. Respiration gating and Bloch fitting improve pH measurements with acidoCEST MRI in an ovarian orthotopic tumor model

    NASA Astrophysics Data System (ADS)

    Jones, Kyle M.; Randtke, Edward A.; Howison, Christine M.; Pagel, Mark D.

    2016-03-01

    We have developed a MRI method that can measure extracellular pH in tumor tissues, known as acidoCEST MRI. This method relies on the detection of Chemical Exchange Saturation Transfer (CEST) of iopamidol, an FDA-approved CT contrast agent that has two CEST signals. A log10 ratio of the two CEST signals is linearly correlated with pH, but independent of agent concentration, endogenous T1 relaxation time, and B1 inhomogeneity. Therefore, detecting both CEST effects of iopamidol during in vivo studies can be used to accurately measure the extracellular pH in tumor tissues. Past in vivo studies using acidoCEST MRI have suffered from respiration artifacts in orthotopic and lung tumor models that have corrupted pH measurements. In addition, the non-linear fitting method used to analyze results is unreliable as it is subject to over-fitting especially with noisy CEST spectra. To improve the technique, we have recently developed a respiration gated CEST MRI pulse sequence that has greatly reduced motion artifacts, and we have included both a prescan and post scan to remove endogenous CEST effects. In addition, we fit the results by parameterizing the contrast of the exogenous agent with respect to pH via the Bloch equations modified for chemical exchange, which is less subject to over-fitting than the non-linear method. These advances in the acidoCEST MRI technique and analysis methods have made pH measurements more reliable, especially in areas of the body subject to respiratory motion.

  7. Acido-basic control of the thermoelectric properties of poly(3,4-ethylenedioxythiophene)tosylate (PEDOT-Tos) thin films

    PubMed Central

    Khan, Zia Ullah; Bubnova, Olga; Jafari, Mohammad Javad; Brooke, Robert; Liu, Xianjie; Gabrielsson, Roger; Ederth, Thomas; Evans, Drew R.; Andreasen, Jens W.; Fahlman, Mats

    2015-01-01

    PEDOT-Tos is one of the conducting polymers that displays the most promising thermoelectric properties. Until now, it has been utterly difficult to control all the synthesis parameters and the morphology governing the thermoelectric properties. To improve our understanding of this material, we study the variation in the thermoelectric properties by a simple acido-basic treatment. The emphasis of this study is to elucidate the chemical changes induced by acid (HCl) or base (NaOH) treatment in PEDOT-Tos thin films using various spectroscopic and structural techniques. We could identify changes in the nanoscale morphology due to anion exchange between tosylate and Cl– or OH–. But, we identified that changing the pH leads to a tuning of the oxidation level of the polymer, which can explain the changes in thermoelectric properties. Hence, a simple acid–base treatment allows finding the optimum for the power factor in PEDOT-Tos thin films. PMID:27019715

  8. TUBERCULOSIS COMO ENFERMEDAD OCUPACIONAL

    PubMed Central

    Mendoza-Ticona, Alberto

    2014-01-01

    Existe evidencia suficiente para declarar a la tuberculosis como enfermedad ocupacional en diversos profesionales especialmente entre los trabajadores de salud. En el Perú están normados y reglamentados los derechos laborales inherentes a la tuberculosis como enfermedad ocupacional, como la cobertura por discapacidad temporal o permanente. Sin embargo, estos derechos aún no han sido suficientemente socializados. En este trabajo se presenta información sobre el riesgo de adquirir tuberculosis en el lugar de trabajo, se revisan las evidencias para declarar a la tuberculosis como enfermedad ocupacional en trabajadores de salud y se presenta la legislación peruana vigente al respecto. PMID:22858771

  9. Como Lo Hago Yo: Myelomeningocele

    PubMed Central

    Lazareff, Jorge

    2014-01-01

    Fortificación con ádico fólico es efectiva, pero aún falta conciencia en los jóvenes. La legalidad del aborto aumenta la importancia de la consulta prenatal. Realizo la cirugía bajo microcoscopio por razones didácticas. Irrigación continua para reducir la temperatura del tejido. Trato a la plaqueta como tejido viable. No suturo la plaqueta. No cierro músculo. ATB por una semana después de cirugía. Hidrocefalia: Válvula en todos los casos de ventriculomegalia. Médula anclada: Desanclar una sola vez. Chiari II: Revisar la válvula. Incluir en el seguimiento rendimiento escolar, puede indicar obstrucción de la válvula o médula anclada. PMID:24791217

  10. Como Lo Hago Yo: Mielomeningocele En Bolivia

    PubMed Central

    Dabdoub, Carlos F.; Dabdoub, Carlos B.; Villavicencio, Ramiro; Quevedo, Germán

    2014-01-01

    Introducción: Las malformaciones del tubo neural (MTN) representan la segunda causa más frecuente de anomalías congénitas, luego de las cardiopatías. En este grupo se destaca el mielomeningocele (MMC) por su mayor incidencia, y por ser la más incapacitante y la más compleja entre todas las demás malformaciones del sistema nervioso c`entral (SNC). En Bolivia, como en muchos países de Sudamérica, los bajos niveles socio-culturales y la debilidad en el sistema sanitario, hacen que su incidencia y su morbilidad, sean mayores que en las naciones más desarrolladas. Material y Métodos: Se realizó un estudio retrospectivo y descriptivo de 70 casos de MMC, atendidos por un equipo multidisciplinario en el Hospital Universitario Japonés (HUJ) de Santa Cruz de la Sierra, entre 2008-2011. De ellos, 60 fueron intervenidos quirúrgicamente. Resultados: Se realizaron controles prenatales sólo en 27 mujeres (38.6%), diagnosticándose una disrafia espinal en apenas dos casos (7.4%). La edad de ingreso del MMC en su mayoría fue después de las 24 horas (65.6%), predominando su localización en la región lumbosacra (64.3%). De ellos, 67.2% eran abiertos, presentando un 32.9% un daño neurológico motor parcial mientras que 47.1% tenían paraplejia por debajo de la lesión. De los 70 casos, tres (4.3%) no fueron intervenidos, por presentar defectos congénitos severos o estado general grave. Las principales complicaciones posoperatorias inmediatas fueron: dehiscencia de sutura y/o infección de la herida (16.6%), fístula de líquido cefalorraquídeo (LCR) (10%) e infección del SNC (11.7%). La mortalidad general y postoperatoria fue de 7.1% y 3.3%, respectivamente. Al mes de vida presentaban hidrocefalia un 80% de los pacientes operados, colocándose una derivación ventriculoperitoneal (DVP) de presión media. De 9 pacientes que tuvieron un acompanamiento de dos o más años, seis presentaron una médula anclada, que fueron intervenidas quirúrgicamente. Conclusi

  11. 15. Como gatehouse (outlet tower) and access bridge, looking west ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. Como gatehouse (outlet tower) and access bridge, looking west from dam crest (Trash rack visible in reservoir pool behind and right of tower) - Bitter Root Irrigation Project, Como Dam, West of U.S. Highway 93, Darby, Ravalli County, MT

  12. Harold Varmus investido bajo juramento como 14.º director d

    Cancer.gov

    Ganador del Premio Nobel, doctor Harold E. Varmus, prestó juramento hoy como 14.º director del Instituto Nacional del Cáncer (NCI).  "Es muy estimulante que estés de regreso con nosotros", dijo la secretaria del Departamento de Salud y Servicios Humanos K

  13. LA BIOÉTICA COMO QUEHACER FILOSÓFICO

    PubMed Central

    Ferrer, Jorge José

    2009-01-01

    El artículo examina el estatuto epistemológico de la bioética como disciplina académica. El autor sostiene que el estatuto epistemológico de un discurso lo determina la pregunta fundamental que se plantea y la respuesta que se busca, focos integradores del discurso. En el caso de la bioética, la pregunta fundamental es de índole moral. La bioética es pues una disciplina ética que tiene su hogar epistemológico en la filosofía. El autor también defiende el concepto de “éticas aplicadas”. Sugiere finalmente que el método de la bioética, sobre todo la que se hace desde nuestras latitudes, debería adoptar el círculo hermenéutico como metodología para su filosofar. PMID:20463860

  14. Recent DDT and PCB contamination in the sediment and biota of the Como Bay (Lake Como, Italy).

    PubMed

    Bettinetti, R; Quadroni, S; Boggio, E; Galassi, S

    2016-01-15

    Due to its peculiar geographical and morphological characteristics, Lake Como (Northern Italy) represents an interesting study-case for investigating the sub-basin scale circulation of persistent organic pollutants (POPs) that, despite being banned since the 1970s, have reached surprisingly high concentrations in some southern alpine lakes as a consequence of their release from melting glaciers in recent years. In particular, the Como Bay, which is located in the city of Como, seems noteworthy because its waters have a longer residence time than the other areas of the lake. The analyses of the historical concentration of PCBs, pp′DDT and its metabolites in a sediment core sampled from the Como Bay covering a time-period from their ban to recent times, showed that the DDTs have never experienced a significant (p < 0.05) decrease over time, with concentrations of the most abundant homologue, pp′DDE, ranging from 27 to 75 ng g(-1) d.w. Conversely PCBs significantly (p < 0.05) decreased towards recent times, reaching concentrations around 80 ng g(-1) d.w. The contribution of high altitude and local sources was recorded also in the food web: both zooplankton and the zooplanktivorous fish agone were mainly contaminated by pp′DDE (81.4 ng g(-1) w.w. and 534.6 ng g(-1) w.w. respectively) and by the PCB metabolite hexa-CB (449.7 ng g(-1) w.w. and 1672.1 ng g(-1) w.w. respectively). The DDT concentrations in the agone (sampled during the years 2006–2009) never exceeded the limits for human consumption in Italy, while concentrations of six selected PCBs exceeded human health advisory recommendations in one of the fish samples analysed, when it was approximately two times higher than the recommended value of 125 ng g(-1) w.w. PMID:26520265

  15. Valorisation of Como Historical Cadastral Maps Through Modern Web Geoservices

    NASA Astrophysics Data System (ADS)

    Brovelli, M. A.; Minghini, M.; Zamboni, G.

    2012-07-01

    Cartographic cultural heritage preserved in worldwide archives is often stored in the original paper version only, thus restricting both the chances of utilization and the range of possible users. The Web C.A.R.T.E. system addressed this issue with regard to the precious cadastral maps preserved at the State Archive of Como. Aim of the project was to improve the visibility and accessibility of this heritage using the latest free and open source tools for processing, cataloguing and web publishing the maps. The resulting architecture should therefore assist the State Archive of Como in managing its cartographic contents. After a pre-processing consisting of digitization and georeferencing steps, maps were provided with metadata, compiled according to the current Italian standards and managed through an ad hoc version of the GeoNetwork Opensource geocatalog software. A dedicated MapFish-based webGIS client, with an optimized version also for mobile platforms, was built for maps publication and 2D navigation. A module for 3D visualization of cadastral maps was finally developed using the NASA World Wind Virtual Globe. Thanks to a temporal slidebar, time was also included in the system producing a 4D Graphical User Interface. The overall architecture was totally built with free and open source software and allows a direct and intuitive consultation of historical maps. Besides the notable advantage of keeping original paper maps intact, the system greatly simplifies the work of the State Archive of Como common users and together widens the same range of users thanks to the modernization of map consultation tools.

  16. 78 FR 36163 - Bitterroot National Forest, Darby Ranger District, Como Forest Health Project

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-17

    ... FHP covers approximately 5,640 acres of national forest land between Lake Como and Lost Horse Roads... project area lies between Lake Como Road and Lost Horse Road, about three miles northwest of...

  17. Morphological investigation of nanostructured CoMo catalysts

    NASA Astrophysics Data System (ADS)

    Pawelec, B.; Castaño, P.; Zepeda, T. A.

    2008-04-01

    This work reports the morphological investigation of nanostructured sulfided CoMo catalysts by means of high-resolution transmission electron microscopy (HRTEM). The catalysts were supported on Ti-modified hexagonal mesoporous silica (HMS-Ti) and P-modified HMS-Ti (P/HMS-Ti) materials. The oxide precursors were characterized by specific surface area (S BET), temperature-programmed reduction (TPR), diffuse reflectance infrared Fourier transform spectroscopy in the OH region (DRIFTS-OH) and X-ray photoelectron spectroscopy (XPS) in order to elucidate the influence of the impregnation sequence (successive vs. simultaneous) and the effect of P-incorporation into HMS-Ti material on the morphology of calcined CoMo catalysts. Both TPR and XPS measurements indicate that the catalysts prepared by successive impregnation possess well-dispersed MoO 3 and CoO phases, whereas their counterparts prepared by simultaneous impregnation additionally possess the CoMoO 4 phase. For all sulfided catalysts, the presence of MoS 2 phase with particle size in the range 3.3-4.4 nm was confirmed by HRTEM. Catalytic activity was evaluated in the reaction of hydrodesulfurization (HDS) of dibenzothiophene (DBT) carried out in a flow reactor at 593 K and hydrogen pressure of 5.5 MPa. P-incorporation into the HMS-Ti material led to an overall increase in HDS activity and the hydrogenation ability of the sulfided catalysts. All catalysts proved to be stable during 10 h time-on-stream (TOS) operation. The activity of sulfide catalysts in the target reaction depends linearly on the surface exposure of Co species in the oxide precursors, as determined by XPS, and on the morphology of the sulfide form of catalysts (surface density of MoS 2 particles and their sizes) as determined by HRTEM.

  18. 78 FR 38287 - Bitterroot National Forest, Darby Ranger District, Como Forest Health Project

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-26

    .... Correction In the Federal Register of June 17, 2013, in FR DOC 2013- 14229 on page 36163 in the second column...,640 acres of national forest between Lake Como and Lost Horse roads, about 6 miles northwest of...

  19. Como preparar un programa de informacion sobre la asistencia economica (Planning a Financial Aid Awareness Program).

    ERIC Educational Resources Information Center

    Department of Education, Washington, DC.

    This booklet, written in Spanish, is intended to be used with a set of slides as part of a presentation to students on "How To Apply for Federal Student Aid" ("Como Solicitar la Asistencia Economica Federal para Estudiantes"). The first part of the book is a script based on the slides. After the script is a guide to hosting a financial aid…

  20. Prevalence of previously undiagnosed abdominal aortic aneurysms in the area of Como: the ComoCuore "looking for AAA" ultrasonography screening.

    PubMed

    Corrado, Giovanni; Durante, Alessandro; Genchi, Vincenzo; Trabattoni, Loris; Beretta, Sandro; Rovelli, Enza; Foglia-Manzillo, Giovanni; Ferrari, Giovanni

    2016-08-01

    The prognosis for abdominal aortic aneurysm (AAA) rupture is poor. Long-term follow-up of population-based randomized trials has demonstrated that ultrasound (US) screening for abdominal aortic aneurysms (AAAs) measuring 3 cm or greater decreases AAA-related mortality rates and is cost-effective. We though to prospectively perform during a 26-month period a limited US examination of the infrarenal aorta in volunteers of both gender aged 60-85 years without history of AAA living in the area of Como, Italy. From September 2010 to November 2013 ComoCuore, a no-profit nongovernmental association, enrolled 1555 people (aged 68.8 ± 6.8 years; 48.6 % males). Clinical data and a US imaging of the aorta were collected for each participant. AAA was found in 22 volunteers (1.4 %) mainly males (2.5 % in males vs. 0.4 % in females p = 0.005). Overall, the prevalence of cardiovascular risk factors was higher in patients with vs. without AAA (mean 2.9 ± 3.0 vs. 1.4 ± 1.0 respectively, p < 0.0001). Independent predictors of AAA on multivariate analysis were age (OR 1.14, 1.06-1.22; p < 0.0001), male gender (OR 8.23, 1.79-37.91; p = 0.007), and both current (OR 4.98, 1.57-15.79; p = 0.007) and previous smoking (OR 2.76, 1.12-8.94; p = 0.03). Our study confirms the feasibility of one time US screening for AAA in a large cohort of asymptomatic people. Independent predictors of AAA were male sex, older age and a history of smoking. Accordingly to recent data the prevalence of AAA seems to be declining, maybe due to a reduction of smoking in Italy. PMID:27215751

  1. Acido-basic properties of proton pump inhibitors in aqueous solutions.

    PubMed

    Kristl, Albin

    2009-01-01

    The pharmacological characteristics of proton pump inhibitors are related to their protolytic behavior estimated by their pK(a) values. Lansoprazole is a potent anti-acid drug from this group. Because of its poor stability a rapid spectrophotometric method was developed for the determination of its pK(a) values. Three pK(a) values were obtained: an acidic pK(a1) = 8.84 and two basic, pK(a2) = 4.15 and pK(a3) = 1.33. These pK(a) values were discussed from the point of lansoprazole structure and instability with the aim of locating basic and acidic moieties in the molecule of proton pump inhibitors. They were also compared with experimentally determined pK(a) values from the literature and with some pK(a) values calculated by different programs. PMID:18720145

  2. Sorption of uranyl ions from various acido systems by amphoteric epoxy amine ion-exchange resins

    SciTech Connect

    Rychkov, V.N.; Radionov, B.K.; Molochnikov, L.S.

    1995-03-01

    Sorption of uranyl ions by epoxy amine ampholytes with N-monomethylenephosphonic acid groups modified with pyridine or quaternary ammonium groups was studied under dynamic conditions. Heterocyclic nitrogen favors sorption of uranyl ion from fluoride, sulfate, and fluoride-sulfate solutions. The ESR studies of mono- and bimetallic forms of nitrogen-containing ampholytes with copper(II) as paramagnetic marker revealed the characteristics of uranium(VI) interaction with cation- and anion-exchange groups and its dependence on the fluoride content in solution.

  3. Acido, ergo sum: Holger Hydén--the neuroscientist in Cortázar's Hopscotch.

    PubMed

    Delgado, Guillermo; Estañol, Bruno

    2013-06-01

    The fictional Italian author Morelli is throughout the novel "Hopscotch" (1963) Julio Cortázar's alter ego. This character proposes an unoriginal literary hypothesis in chapter 62. There is an allusion to a particular Swedish that 'is working on a chemical theory of thought.' The Swedish neuroscientist under analysis is Holger Hydén (1917-2000), by then professor and chairman of the Department of Histology at the University of Göteborg. Hydén, who was the first to work in neurobiological micromethods, is mentioned by Morelli due to his participation in a symposium held at the end of January 1961, in San Francisco. His pioneering work will never be completely forgotten, because Hydén's neuroscientific legacy lives and will live in Cortázar's "Hopscotch". PMID:23828537

  4. The Sefwi-Comoé belt Ghana/Ivory Coast : a major crustal shear zone ?

    NASA Astrophysics Data System (ADS)

    Jessell, Mark

    2010-05-01

    The Palaeoproterozoic Sefwi-Comoé region that straddles Ghana and the Ivory Coast in West Africa has been characterised as resulting from a combination of compression and simple shear during late synkinematic leucogranite intrusion. The analysis of regional geophysical datasets allows us to better define the geometry of the major lithostratigraphic packages and their structural contacts in this region. This analysis reveals a series of well defined leucogranites intrusions enveloped by high strain zones. Recent finite element modelling of two-phase aggregates has shown that we can analyse the geometry of these systems both in terms of their finite defomation and their mechanical contrast. We interpret the geometries we see in the Sefwi-Comoé region as reflecting the activity of a major crustal deformation zone which was dominated by simple shear. The comparison with the modelling suggests a finite shear strain of approximately 5 gamma, which in turn implies a lateral displacement of 400 km across the belt. Our analysis suggests that the leucogranites were already acting as more rigid bodies during the (dextral?) shearing, suggesting that their emplacement was predominantly pre-kinematic, and which has implications for their potential subsequent remobilization by gravitational forces.

  5. Vulnerability and adaptation to climate change in the Comoe River Basin (West Africa).

    PubMed

    Yéo, Wonnan Eugène; Goula, Bi Tié Albert; Diekkrüger, Bernd; Afouda, Abel

    2016-01-01

    Climate change is impacting water users in many sectors: water supply, farming, industry, hydropower, fishing, housing, navigation and health. Existing situations, like population growth, movement of populations from rural to urban areas, poverty and pollution can aggravate the impacts of climate change. The aim of the study is to evaluate the vulnerability of different water user groups to climate change and define communities' adaptation strategies in the Comoe River Basin. Information was collected on communities' concerns and perception on changes in climate and potential adaptation measures and strategies. Results show that 95 % of the sample in the study communities had heard of it and are aware that climate change is occurring. They have been experiencing changes in economic activity and cropping pattern, reduced water level in rivers, crop failure, delay in cropping season, new pests and diseases, food insecurity, drop in income and decline in crop yield. Results also show that communities employ various adaptation strategies including crops diversification, substitution and calendar redefinition, agroforestry, borrowing from friends and money lenders and increasing fertilizer application. PMID:27386296

  6. Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst

    SciTech Connect

    Muralidhar, G.; Massoth, F.E.; Shabtai, J.

    1984-01-01

    C-S hydrogenolysis (HDS) of thiophene, hydrogenation (HYD) of 1-hexene, and hydrocracking (HCG) of 2,4,4-trimethyl-1-pentene, were used as separate model test reactions to differentiate and assess the catalytic functionalities of sulfided CoMo catalysts, and their dependence on the nature of the support and incorporation of additives. Rate constants and relative catalyst activities for these three reaction types were determined. HDS and HYD activities of CoMo supported on different types of Al/sub 2/O/sub 3/ were higher, while the HCG activity was lower compared with CoMo supported on SiO/sub 2/-Al/sub 2/O/sub 3/, SiO/sub 2/-MgO, or TiO/sub 2/. For SiO/sub 2/-Al/sub 2/O/sub 3/ supports both HDS and HYD activities decreased with increase in SiO/sub 2/ content from 10 to 75%, while HCG activity showed the opposite trend. Additives to a finished CoMo catalyst at 0.5% level caused variations in HDS and HCG activities, while HYD was essentially unaffected. HDS was promoted by NH/sub 4/HF/sub 2/ and NH/sub 4/Cl, but depressed by NaNO/sub 3/, Ca(NO/sub 3/)/sub 2/, and H/sub 3/BO/sub 3/. HCG was promoted by NH/sub 4/HF/sub 2/, NH/sub 4/Cl, and H/sub 3/BO/sub 3/. Additives at 5% level, prior to or after CoMo impregnation, showed a strong depressing effect on HDS and a lesser effect on HYD, while HCG was strongly promoted by NH/sub 4/HF/sub 2/, Ti isopropoxide, and H/sub 3/BO/sub 3/. The changes in catalytic functionalities are rationalized in terms of different interactions between CoMo phase, support, and additives. 3 tables, 1 figure.

  7. DIABETES MELLITUS COMO FACTOR DE RIESGO DE DEMENCIA EN LA POBLACIÓN ADULTA MAYOR MEXICANA

    PubMed Central

    Silvia, Mejía-Arango; Clemente, y Zúñiga-Gil

    2012-01-01

    Introduccion La diabetes mellitus y las demencias constituyen dos problemas crecientes de salud entre la población adulta mayor del mundo y en particular de los paises en desarrollo. Hacen falta estudios longitudinales sobre el papel de la diabetes como factor de riesgo para demencia. Objetivo Determinar el riesgo de demencia en sujetos Mexicanos con diabetes mellitus tipo 2. Materiales y Metodos Los sujetos diabéticos libres de demencia pertenecientes al Estudio Nacional de Salud y Envejecimiento en México fueron evaluados a los dos años de la línea de base. Se estudió el papel de los factores sociodemográficos, de otras comorbilidades y del tipo de tratamiento en la conversión a demencia. Resultados Durante la línea de base 749 sujetos (13.8%) tuvieron diabetes. El riesgo de desarrollar demencia en estos individuos fue el doble (RR, 2.08 IC 95%, 1.59–2.73). Se encontró un riesgo mayor en individuos de 80 años y más (RR 2.44 IC 95%, 1.46–4.08), en los hombres (RR, 2.25 IC 95%, 1.46–3.49) y en sujetos con nivel educativo menor de 7 años. El estar bajo tratamiento con insulina incrementó el riesgo de demencia (RR, 2.83, IC 95%, 1.58–5.06). Las otras comorbilidades que aumentaron el riesgo de demencia en los pacientes diabéticos fueron la hipertensión (RR, 2.75, IC 95%, 1.86–4.06) y la depresión (RR, 3.78, 95% IC 2.37–6.04). Conclusión Los sujetos con diabetes mellitus tienen un riesgo mayor de desarrollar demencia, La baja escolaridad y otras comorbilidades altamente prevalentes en la población Mexicana contribuyen a la asociación diabetes-demencia. PMID:21948010

  8. Hydrotreatment of Athabasca bitumen derived gas oil over Ni-Mo, Ni-W, and Co-Mo catalysts

    SciTech Connect

    Diaz-Real, R.A.; Mann, R.S.; Sambi, I.S. . Dept. of Chemical Engineering)

    1993-07-01

    The hydrotreatment of Athabasca bitumen derived heavy gas oil containing 4.08% S and 0.49% N was carried out in a trickle bed reactor over Ni-W, Ni-Mo, and Co-Mo catalysts supported on zeolite-alumina-silica at 623-698 K, LHSV of 1-4, gas flow rate 890 m[sup 3][sub H2]/m[sup 3][sub oil] (5,000 sef/bbl), and pressure of 6.89 MPa. Analyses for viscosity, density, aniline point, ASTM mid boiling point distillation, C/H ratio, and percentage of N and S in the final product were carried out to characterize the product oil. The amounts of N and S removed indicated the hydrodenitrogenation and hydrodesulfurization activity of the catalysts. Results of zeolite-alumina-silica-supported catalysts are compared to those obtained with commercially available Ni-Mo, Ni-W, and Co-Mo on [gamma]-alumina. Ni-Mo supported on zeolite-alumina-silica was most active and could remove as much as 99 % S and 89% N present in the oil at 698 K. The data for HDN and HDS fitted the pseudo first order model. The kinetic model is described in detail.

  9. Alejarse como proceso social: niños y ancianos «abandonados» en Ayacucho1

    PubMed Central

    Leinaweaver, Jessaca

    2013-01-01

    En investigaciones previas sobre el acogimiento familiar y la adopción en Ayacucho, se ha podido descubrir cómo los ayacuchanos adquieren y producen relaciones sociales. Mientras negocian creativamente los discursos y espacios construidos simultáneamente por instituciones, comunidades, y estructuras sociales, van adquiriendo nuevas formas de relacionarse. Este artículo discute el proceso opuesto: el deshacerse de relaciones de parentesco, y el proceso social del abandono o alejamiento. Cuando se aleja a una persona de su familia o su comunidad, los que se quedan en ella llegan a entenderse como ciertos tipos de personas. En los estudios de caso discutidos aquí, recopilados a través de una detallada y cuidadosa observación participante y de entrevistas etnográficas grabadas entre 2001 y 2007, se puede ver cómo, después de un alejamiento social, los individuos que alejan se reinterpretan como sujetos que se encuentran superándose o volviéndose modernos, o bien sacrificándose. PMID:25177044

  10. Ab initio study of energetics and magnetism of sigma phase in Co-Mo and Fe-Mo systems

    NASA Astrophysics Data System (ADS)

    Pavlů, J.; Vřešťál, J.; Šob, M.

    2016-02-01

    We analyse, from first-principles, the energetics and magnetic ordering of sigma phases in Co-Mo and Fe-Mo systems. Total energy differences between the sigma phase and Standard Element Reference (SER) structures are calculated in the whole concentration range at equilibrium volumes by means of the linear muffin-tin orbitals method in the atomic-sphere approximation (LMTO-ASA), the full-potential linearised augmented-plane waves (FLAPW) method and the pseudopotential approach. They are compared with the enthalpy of formation of sigma phase obtained from the phase equilibria calculations at higher temperature based on the semiempirical CALPHAD (CALculation of PHAse Diagram) method. It turns out that the binary sigma phases are more stable than the weighted average of the sigma phase of elemental constituents and that this stability for Fe-Mo is higher than for Co-Mo. On the other hand it was found that the binary sigma phases do not exhibit any stability with respect to the weighted average of the SER structures. The magnetic configurations in all systems are investigated and the stabilizing effect of magnetic order in sigma phase at 0 K is presented. It turns out that the atomic magnetic moment strongly depends on the type of occupied sublattice and total composition of the alloy.

  11. Effects of acido-basic support properties on the catalytic hydrogenation of acetylene on gold nano-particles

    NASA Astrophysics Data System (ADS)

    Manda, Abdullah Ahmed

    Metallic gold nanoparticles supported on gamma-Al2O 3 and magnesia-alumina mixed oxide, with different magnesia content have been prepared by sol-gel method and characterized by different techniques (inductive coupled plasma-mass spectroscopy (ICP-MS), XRD, BET surface area analysis, transmission electron microscopy (TEM), CO2 and NH 3 temperature programmed desorption (TPD), H2 temperature programmed reduction (TPR) and FTIR of adsorbed CO2). Such systems were found to produce catalysts with controllable acidity, varying from catalyst possessing large density of acidic and low density of basic sites, others with acidic and basic sites of equal strength and density, and others with large basic and low acid sites densities, respectively. The catalytic assessment of the generated acidity was carried out using 2-propanol decomposition as a test reaction. The results obtained indicate that the presence of magnesia and reduced gold nanopartilces has imparted the catalysts, 1%Au/4%Mg-Al 2O3 and 1%Au/8%Mg-Al2O3, with significant base-catalytic properties. Acetylene hydrogenation and formation of coke deposits were investigated on a gold catalyst supported on gamma-Al2O3 and gold supported on alumina-magnisia mixed oxide with different gold content; 1%Au/gamma-Al 2O3, 1%Au/15%Mg-Al2O3, 2%Au/15%Mg-Al 2O3 and 4%Au/15%Mg-Al2O3. The effect of the H2/C2H2 ratio was studied over a range of values. The catalytic activity and selectivity towards ethylene and other products were investigated at different reaction temperatures. Acetylene hydrogenation was investigated in the presence and absence of ethylene in stream. It is investigated that the adsorption of the triple bond is preferred over the double bond and during selective catalytic (SCR) of C2H2 the two hydrocarbons do not compete for the same adsorption sites. The deactivation of catalysts was studied by temperature programmed oxidation (TPO). Higher content of coke over 1%Au/Al2O3 catalyst was investigated in contrast to the other catalysts in which the basisity of magnesia-alumina supports could have played an important role in inhibiting the acidic carbon formation by possessing smaller number and/or weaker acid sites.

  12. The stucco decorations from St. Lorenzo in Laino (Como, Italy): The materials and the techniques employed by the "Magistri Comacini".

    PubMed

    Rampazzi, Laura; Rizzo, Biagio; Colombo, Chiara; Conti, Claudia; Realini, Marco; Bartolucci, Ugo; Colombini, Maria Perla; Spiriti, Andrea; Facchin, Laura

    2008-12-01

    The paper reports a cross-cutting and systematic approach to the analytical study of Baroque stucco decorations by Italian artists known as "Magistri Comacini". Samples from the Church of St. Lorenzo in Laino (Como, Italy) were analysed using chemical and mineralogical techniques and the results interpreted with the help of art historians in order to enlighten the artistic techniques. The characterisation of the binder, aggregate and organic fractions was carried out through optical microscopy, scanning electron microscopy with microprobe, X-ray powder diffraction, Fourier transform infrared spectroscopy, gas chromatography-mass spectrometry and laser ablation mass spectrometry equipped with plasma source spectrometry. The results on major, minor and trace components ascertained various recipes. In particular, the investigation of the finishing layers corroborated hypotheses of attribution and chronology and stressed the different skills of the artists working in the building, shedding a light on details of the decoration technique. PMID:19068330

  13. A Utilização da Astronomia como Tema Interdisciplinar e Aplicações de Objetos de Aprendizagem

    NASA Astrophysics Data System (ADS)

    da Silva, L. A.; Voelzke, M. R.

    2008-09-01

    Este trabalho visa analisar a possibilidade de relacionar conteúdos aplicados no ensino fundamental e médio de forma interdisciplinar por intermédio da astronomia, com a intervenção de objetos de aprendizagem que possam integrar as disciplinas e a utilização de recursos tecnológicos. Em uma pesquisa prévia com 20 professores de uma escola estadual situada na cidade de Guarulhos foi observado que apenas 25% dos professores utilizam algum recurso tecnológico para o desenvolvimento de conteúdos pertinentes à sua disciplina, tais como sites e softwares educativos, sendo que a maioria absoluta continua ensinando apenas com livros didáticos. A maior parte dos professores apresenta dificuldades em trabalhar sua disciplina de forma interdisciplinar, ou seja, 75% dos professores preferem aplicar os conteúdos seguindo uma hierarquia linear de tópicos, evitando a discussão de temas que de alguma forma estão relacionados. A astronomia pode vir à fascinar o ser humano e despertar sua curiosidade promovendo um maior interesse no aprendizado, podendo favorecer análises interdisciplinares de forma lógica e objetiva, desta forma colocar a astronomia como tema motivador interdisciplinar, pode ser relevante no que se refere ao distanciamento da fragmentação dos conteúdos. No Estado de São Paulo, a implantação da proposta curricular no ensino fundamental e médio mostra claramente a inserção da astronomia na maior parte das séries, principalmente na 6ª série em que todo o bimestre se fala de astronomia.

  14. Las fulguraciones como manifestación de reconexión en el campo magnético solar

    NASA Astrophysics Data System (ADS)

    Bagalá, L. G.; Mandrini, M. C.; Rovira, M. G.; Démoulin, P.

    Las fulguraciones solares son fenómenos transitorios de liberación de energía que se desarrollan en las estructuras magnéticas de las regiones activas del Sol. Las fulguraciones pueden llegar a liberar hasta 1032 erg en 100 seg. en todo el rango electromagnético, y acelerar partículas. En este trabajo mostramos que la ubicación de los abrillantamientos en Hα de diversas fulguraciones está relacionado con las propiedades de las conexiones de las líneas del campo magnético de la región, como se espera por las teorías de reconexión en 3D recientemente desarrolladas (Démoulin et al, 1996a). El campo magnético coronal se extrapola del campo fotosférico observado suponiendo una configuración libre de fuerzas lineal. Por medio de un algoritmo se determinan las regiones donde existe un cambio drástico en la conectividad de las líneas de campo (límites ``cuasi-discontinuos'', o cuasi-separatrices CS). Las CS son bandas abiertas que identifican zonas donde el campo magnético se reconectará con más probabilidad y, siempre que las mismas sean lo suficientemente finas, se producirá allíla liberación de energía proveniente del campo magnético. Hemos encontrado que en todas las regiones fulgurantes estudiadas (Démoulin et al, 1996b) existen CS en los mismos lugares donde se observaron los abrillantamientos en Hα. Allídonde coinciden los abrillantamientos con las CS, éstas tienen un espesor menor que 1 Mm. Las líneas de campo coronales extrapoladas de nuestro modelo tienen sus orígenes fotosféricos a ambos lados de las CS, como se espera dados los recientes estudios de reconexión magnética en 3D. Estos resultados ponen a prueba los modelos presentes sobre fulguraciones solares.

  15. In-situ HRTEM study of the reactive carbide phase of Co/MoS2 catalyst.

    PubMed

    Ramos, Manuel; Ferrer, Domingo; Martinez-Soto, Eduan; Lopez-Lippmann, Hugo; Torres, Brenda; Berhault, Gilles; Chianelli, Russell R

    2013-04-01

    Hydrotreatment catalytic operations are commonly performed industrially by layered molybdenum sulfide promoted by cobalt or nickel in order to remove heteroelements (S, N, O) from fossil fuels and biofuels. Indeed, these heteroelements are responsible of the emission of pollutants when these fuels are used in vehicles. In this respect, previous studies made by our research group have shown that the active phase under steady state conditions is partially carbided while strong bending effects of MoS2 slabs were also observed. However, up to now, the morphology of the resulting Co/MoSxCy carbided catalyst has not been fully characterized. In the present study, for the first time, a chemical reaction between the carbon content of a TEM Cu/C grid and a freshly sulfide Co/MoS2 catalyst was in situ observed at 300 °C and 450 °C by HRTEM experimental techniques at ~10 nm of resolution. Results indicate that bending of MoS2 layers occurred due to carbon addition on MoS2 edge sites, as observed in stabilized catalysts after HDS reaction. Using a silicon grid, only cracks of MoS2 slabs were observed without bending effect confirming the role of structural-carbon in this change of morphology. PMID:22925737

  16. XAS Study at Mo and Co K-Edges of the Sulfidation of a CoMo / Al2O3 Hydrotreating Catalyst

    NASA Astrophysics Data System (ADS)

    Pichon, C.; Gandubert, A. D.; Legens, C.; Guillaume, D.

    2007-02-01

    Because of its impact on environment, the removal of sulfur is an indispensable step, called hydrotreatment, in the refining of petroleum. One of the most commonly used hydrotreating catalysts is CoMo-type catalyst which is composed of molybdenum disulfide slabs promoted by cobalt atoms (CoMoS phase) and well dispersed on a high specific area alumina. As far as the highest sulfur content allowed in gasoline and diesel is continually decreasing, more and more efficient and active hydrotreating catalysts are required. In order to optimize the reactivity of the CoMo-type catalyst in hydrotreatment, a better understanding of the processes used to produce the active phase (CoMoS slabs) of the catalyst is necessary. The study reported here deals with the sulfiding mechanism of the slabs and the influence of temperature on the phenomenon. Ex situ X-ray absorption spectroscopy (XANES and EXAFS) was used to study the evolution of the structure of CoMo-type catalyst sulfided at various temperatures (from 293 to 873 K). XAS analysis was performed at both molybdenum and cobalt K-edges to obtain a cross-characterization of the sulfidation of the slabs. It evidenced the formation of various compounds, including two molybdenum oxides, MoS3 (or MoS3-like compound) and Co9S8, at specific steps of the sulfiding process. It showed the role of intermediate played by MoS3 (or MoS3-like compound) during the formation of the slabs and the competition between the appearance of promoted slabs (CoMoS phase) and Co9S8. At last, it leaded to the proposal of a mechanism for the sulfidation of the catalyst.

  17. XAS Study at Mo and Co K-Edges of the Sulfidation of a CoMo / Al2O3 Hydrotreating Catalyst

    SciTech Connect

    Pichon, C.; Gandubert, A. D.; Legens, C.; Guillaume, D.

    2007-02-02

    Because of its impact on environment, the removal of sulfur is an indispensable step, called hydrotreatment, in the refining of petroleum. One of the most commonly used hydrotreating catalysts is CoMo-type catalyst which is composed of molybdenum disulfide slabs promoted by cobalt atoms (CoMoS phase) and well dispersed on a high specific area alumina. As far as the highest sulfur content allowed in gasoline and diesel is continually decreasing, more and more efficient and active hydrotreating catalysts are required. In order to optimize the reactivity of the CoMo-type catalyst in hydrotreatment, a better understanding of the processes used to produce the active phase (CoMoS slabs) of the catalyst is necessary. The study reported here deals with the sulfiding mechanism of the slabs and the influence of temperature on the phenomenon. Ex situ X-ray absorption spectroscopy (XANES and EXAFS) was used to study the evolution of the structure of CoMo-type catalyst sulfided at various temperatures (from 293 to 873 K). XAS analysis was performed at both molybdenum and cobalt K-edges to obtain a cross-characterization of the sulfidation of the slabs. It evidenced the formation of various compounds, including two molybdenum oxides, MoS3 (or MoS3-like compound) and Co9S8, at specific steps of the sulfiding process. It showed the role of intermediate played by MoS3 (or MoS3-like compound) during the formation of the slabs and the competition between the appearance of promoted slabs (CoMoS phase) and Co9S8. At last, it leaded to the proposal of a mechanism for the sulfidation of the catalyst.

  18. Tal Como Somos/just as we are: an educational film to reduce stigma toward gay and bisexual men, transgender individuals, and persons living with HIV/AIDS.

    PubMed

    Ramirez-Valles, Jesus; Kuhns, Lisa M; Manjarrez, Dianna

    2014-04-01

    In this article, the authors describe the development and dissemination of a film-based educational intervention to reduce negative attitudes toward gay and bisexual men, transgender women, and people living with HIV/AIDS in Latino communities, with a focus on youth. The intervention, Tal Como Somos/Just as We Are, is based on stigma and attribution theories, extensive formative research, and community input. Evaluation findings among educators and school youth suggest the film has the potential to effectively influence attitudes toward gay and bisexual men, transgender women, and people living with HIV/AIDS. The film and intervention are being disseminated using diffusion of innovations theory through community-based organizations, schools, television broadcasting, and film festivals. PMID:24377496

  19. Telescópio de pequeno porte como suporte ao ensino em cidades com intensa poluição luminosa II

    NASA Astrophysics Data System (ADS)

    Pereira, P. C. R.; Santos-Júnior, J. M.; Cruz, W. S.

    2003-08-01

    Para a maioria dos estudantes, sua passagem pelo ensino formal fundamental envolve a transmissão de fatos que devem ser guardados para um exame, a habilidade para lembrar fórmulas e, eventualmente, a repetição de experimentos que devem produzir resultados exigidos pelo professor. O resultado deste modelo de ensino, ao longo dos anos, é conhecido por todos: desconhecimento e descontentamento, por parte dos estudantes, de temas relativos ao papel e aos processos da ciência. Acreditamos que a Astronomia, pelo seu caráter observacional, é uma das áreas do conhecimento que pode contribuir neste cenário. A Fundação Planetário da Cidade do Rio de Janeiro possui um telescópio Meade LX-200 (25cm) que, juntamente com as câmeras CCD ST-7E e ST8E, tem sido utilizado em projetos voltados aos estudantes do ensino médio desde o ano 2000. Tais projetos envolvem a condução de um projeto de pesquisa observacional num nível apropriado, e possibilitam o contato com técnicas e novas tecnologias: computador, software para manipulação de dados e gráficos, programas de tratamento e redução de dados, uso de equipamentos óptico-eletrônicos (telescópio e CCD), bem como o processo de aquisição de conhecimento. Dentro da proposta dos anos anteriores, priorizamos projetos de uma noite, ou seja, procuramos trabalhar com fenômenos que apresentem variabilidade com intervalo de recorrência relativamente curto. Em todos os casos, optamos pela fotometria diferencial, que tem se mostrado bastante eficiente para o céu luminoso como o da cidade do Rio de Janeiro. Neste painel, apresentamos alguns dos projetos desenvolvidos no último ano, com 25 estudantes. Apresentamos os resultados da observação da variável pulsante AI Vel (V = 6,6) e da variável cataclísmica FO Aqr (V = 13,5), e do monitoramento do trânsito da lua de Júpiter, Europa, ocorrido em 30 de abril de 2003. As curvas de luz produzidas para as primeiras estão concordantes com as da literatura, assim

  20. Tal Como Somos/Just As We Are: An Educational Film to Reduce Stigma towards Gay and Bisexual Men, Transgender Individuals & Persons Living with HIV/AIDS

    PubMed Central

    Ramirez-Valles, Jesus; Kuhns, Lisa M.; Manjarrez, Dianna

    2013-01-01

    In this paper we describe the development and dissemination of a film-based educational intervention to reduce negative attitudes towards gay and bisexual men and transgender women (GBT) and people living with HIV/AIDS (PLWHA) in Latino communities, with a focus on youth. The intervention, Tal Como Somos/Just as We Are, is based on stigma and attribution theories, extensive formative research, and community input. Evaluation findings among educators and school youth suggest the film has the potential to effectively impact attitudes towards GBT and PLWHA. The film and intervention are being disseminated using diffusion of innovations theory through community-based organizations, schools, television broadcasting and film festivals. PMID:24377496

  1. Crystal Structure of ATVORF273, a New Fold for a Thermo- and Acido-Stable Protein from the Acidianus Two-Tailed Virus

    PubMed Central

    Felisberto-Rodrigues, Catarina; Blangy, Stéphanie; Goulet, Adeline; Vestergaard, Gisle; Cambillau, Christian; Garrett, Roger A.; Ortiz-Lombardía, Miguel

    2012-01-01

    Acidianus two-tailed virus (ATV) infects crenarchaea of the genus Acidianus living in terrestrial thermal springs at extremely high temperatures and low pH. ATV is a member of the Bicaudaviridae virus family and undergoes extra-cellular development of two tails, a process that is unique in the viral world. To understand this intriguing phenomenon, we have undertaken structural studies of ATV virion proteins and here we present the crystal structure of one of these proteins, ATV. ATV forms tetramers in solution and a molecular envelope is provided for the tetramer, computed from small-angle X-ray scattering (SAXS) data. The crystal structure has properties typical of hyperthermostable proteins, including a relatively high number of salt bridges. However, the protein also exhibits flexible loops and surface pockets. Remarkably, ATV displays a new protein fold, consistent with the absence of homologues of this protein in public sequence databases. PMID:23056221

  2. Effectiveness of anisodamine for the treatment of critically ill patients with septic shock (ACIdoSIS study): study protocol for randomized controlled trial

    PubMed Central

    Zhou, Jiancang; Shang, You; Wang, Xin’an; Yin, Rui; Zhu, Zhenhua; Chen, Wensen; Tian, Xin; Yu, Yuetian; Zuo, Xiangrong; Chen, Kun; Ji, Xuqing; Ni, Hongying

    2015-01-01

    Background Septic shock is an important contributor of mortality in the intensive care unit (ICU). Although strenuous effort has been made to improve its outcome, the mortality rate is only marginally decreased. The present study aimed to investigate the effectiveness of anisodamine in the treatment of septic shock, in the hope that the drug will provide alternatives to the treatment of septic shock. Methods The study is a multi-center randomized controlled clinical trial. Study population will include critically ill patients with septic shock requiring vasopressor use. Blocked randomization was performed where anisodamine and control treatments were allocated at random in a ratio of 1:1 in blocks of sizes 2, 4, 6, 8, and 10 to 354 subjects. Interim analysis will be performed. The primary study end point is the hospital mortality, and other secondary study endpoints include ICU mortality, length of stay in ICU and hospital, organ failure free days. Adverse events including new onset psychosis, urinary retention, significant hypotension and tachycardia will be reported. Discussion The study will provide new insight into the treatment of septic shock and can help to reduce mortality rate of septic shock. Trial registration NCT02442440 (https://register.clinicaltrials.gov/). PMID:26605292

  3. Hydro-geochemical modeling of subalpine urbanized area: geochemical characterization of the shallow and deep aquifers of the urban district of Como (first results).

    NASA Astrophysics Data System (ADS)

    Terrana, Silvia; Brunamonte, Fabio; Frascoli, Francesca; Ferrario, Maria Francesca; Michetti, Alessandro Maria; Pozzi, Andrea; Gambillara, Roberto; Binda, Gilberto

    2016-04-01

    One of the greatest environmental and social-economics threats is climate change. This topic, in the next few years, will have a significant impact on the availability of water resources of many regions. This is compounded by the strong anthropization of water systems that shows an intensification of conflicts for water resource exploitation. Therefore, it is necessary a sustainable manage of natural resources thorough knowledge of the hosting territories. The development of investigation and data processing methods are essential to reduce costs for the suitable use and protection of resources. Identify a sample area for testing the best approach is crucial. This research aims to find a valid methodology for the characterization, modeling and management of subalpine urban aquifers, and the urban district of Como appears perfect. The city of Como is located at the southern end of the western sector of Lake Como (N Italy). It is a coastal town, placed on a small alluvial plain, therefore in close communication with the lake. The plain is drained by two streams, which are presently artificially buried, and have an underground flow path in the urban section till the mouth. This city area, so, is suitable for this project as it is intensely urbanized, its dimensions is not too extensive and it is characterized by two aquifers very important and little known. These are a shallow aquifer and a deep aquifer, which are important not only for any water supply, but also for the stability of the ground subsidence in the city. This research is also the opportunity to work in a particular well-known area with high scientific significance; however, there is complete absence of information regarding the deep aquifer. Great importance has also the chosen and used of the more powerful open source software for this type of area, such as PHREEQC, EnvironInsite, PHREEQE etc., used for geological and geochemical data processing. The main goal of this preliminary work is the

  4. Congressional Hispanic Caucus: Como Va?

    ERIC Educational Resources Information Center

    Darrow, Denice

    1978-01-01

    The Caucus aims to develop a national policy on behalf of the Spanish-speaking, and to strengthen the Federal commitment toward Hispanics. The Caucus also plans to serve an educational purpose, informing the Hispanic population about the political process and functioning of government. (NQ)

  5. Tailoring (n,m) structure of single-walled carbon nanotubes by modifying reaction conditions and the nature of the support of CoMo catalysts.

    PubMed

    Lolli, Giulio; Zhang, Liang; Balzano, Leandro; Sakulchaicharoen, Nataphan; Tan, Yongqiang; Resasco, Daniel E

    2006-02-01

    The (n,m) population distribution of single-walled carbon nanotubes obtained on supported CoMo catalysts has been determined by photoluminescence and optical absorption. It has been found that the (n,m) distribution can be controlled by varying the gaseous feed composition, the reaction temperature, and the type of catalyst support used. When using CO as a feed over CoMo/SiO2 catalysts, increasing the synthesis temperature results in an increase in nanotube diameter, without a change in the chiral angle. By contrast, by changing the support from SiO2 to MgO, nanotubes with similar diameter but different chiral angles are obtained. Finally, keeping the same reaction conditions but varying the composition of the gaseous feed results in different (n,m) distribution. The clearly different distributions obtained when varying catalysts support and/or reaction conditions demonstrate that the (n,m) distribution is a result of differences in the growth kinetics, which in turn depends on the nanotube cap-metal cluster interaction. PMID:16471791

  6. From Management to Negotiation: Technical and Institutional Innovations for Integrated Water Resource Management in the Upper Comoé River Basin, Burkina Faso

    NASA Astrophysics Data System (ADS)

    Roncoli, Carla; Kirshen, Paul; Etkin, Derek; Sanon, Moussa; Somé, Léopold; Dembélé, Youssouf; Sanfo, Bienvenue J.; Zoungrana, Jacqueline; Hoogenboom, Gerrit

    2009-10-01

    This study focuses on the potential role of technical and institutional innovations for improving water management in a multi-user context in Burkina Faso. We focus on a system centered on three reservoirs that capture the waters of the Upper Comoé River Basin and servicing a diversity of users, including a sugar manufacturing company, a urban water supply utility, a farmer cooperative, and other downstream users. Due to variable and declining rainfall and expanding users’ needs, drastic fluctuations in water supply and demand occur during each dry season. A decision support tool was developed through participatory research to enable users to assess the impact of alternative release and diversion schedules on deficits faced by each user. The tool is meant to be applied in the context of consultative planning by a local user committee that has been created by a new national integrated water management policy. We contend that both solid science and good governance are instrumental in realizing efficient and equitable water management and adaptation to climate variability and change. But, while modeling tools and negotiation platforms may assist users in managing climate risk, they also introduce additional uncertainties into the deliberative process. It is therefore imperative to understand how these technological and institutional innovations frame water use issues and decisions to ensure that such framing is consistent with the goals of integrated water resource management.

  7. From management to negotiation: technical and institutional innovations for integrated water resource management in the Upper Comoé River Basin, Burkina Faso.

    PubMed

    Roncoli, Carla; Kirshen, Paul; Etkin, Derek; Sanon, Moussa; Somé, Léopold; Dembélé, Youssouf; Sanfo, Bienvenue J; Zoungrana, Jacqueline; Hoogenboom, Gerrit

    2009-10-01

    This study focuses on the potential role of technical and institutional innovations for improving water management in a multi-user context in Burkina Faso. We focus on a system centered on three reservoirs that capture the waters of the Upper Comoé River Basin and servicing a diversity of users, including a sugar manufacturing company, a urban water supply utility, a farmer cooperative, and other downstream users. Due to variable and declining rainfall and expanding users' needs, drastic fluctuations in water supply and demand occur during each dry season. A decision support tool was developed through participatory research to enable users to assess the impact of alternative release and diversion schedules on deficits faced by each user. The tool is meant to be applied in the context of consultative planning by a local user committee that has been created by a new national integrated water management policy. We contend that both solid science and good governance are instrumental in realizing efficient and equitable water management and adaptation to climate variability and change. But, while modeling tools and negotiation platforms may assist users in managing climate risk, they also introduce additional uncertainties into the deliberative process. It is therefore imperative to understand how these technological and institutional innovations frame water use issues and decisions to ensure that such framing is consistent with the goals of integrated water resource management. PMID:19707708

  8. Co-Doped MoS₂ Nanosheets with the Dominant CoMoS Phase Coated on Carbon as an Excellent Electrocatalyst for Hydrogen Evolution.

    PubMed

    Dai, Xiaoping; Du, Kangli; Li, Zhanzhao; Liu, Mengzhao; Ma, Yangde; Sun, Hui; Zhang, Xin; Yang, Ying

    2015-12-16

    Highly active and low-cost catalysts for hydrogen evolution reaction (HER) are crucial for the development of efficient water splitting. Molybdenum disulfide (MoS2) nanosheets possess unique physical and chemical properties, which make them promising candidates for HER. Herein, we reported a facile, effective, and scalable strategy by a deposition-precipitation method to fabricate metal-doped (Fe, Co, Ni) molybdenum sulfide with a few layers on carbon black as noble metal-free electrocatalysts for HER. The CoMoS phase after thermal annealing in Co-doped MoS2 plays a crucial role for the enhanced HER. The optimized Co-doped MoS2 catalyst shows superior HER performance with a high exchange current density of 0.03 mA·cm(-2), low onset potential of 90 mV, and small Tafel slope of 50 mV·dec(-1), which also exhibits excellent stability of 10000 cycles with negligible loss of the cathodic current. The superior HER activity originates from the synergistically structural and electronic modulations between MoS2 and Co ions, abundant defects in the active edge sites, as well as the good balance between active sites and electronic conductivity. Thanks to their ease of synthesis, low cost, and high activity, the Co-doped MoS2 catalysts appear to be promising HER catalysts for electrochemical water splitting. PMID:26599427

  9. Detection and identification of pathogenic trypanosome species in tsetse flies along the Comoé River in Côte d’Ivoire

    PubMed Central

    Djohan, Vincent; Kaba, Dramane; Rayaissé, Jean-Baptiste; Dayo, Guiguigbaza-Kossigan; Coulibaly, Bamoro; Salou, Ernest; Dofini, Fabien; Kouadio, Alain De Marie Koffi; Menan, Hervé; Solano, Philippe

    2015-01-01

    In order to identify pathogenic trypanosomes responsible for African trypanosomiasis, and to better understand tsetse-trypanosome relationships, surveys were undertaken in three sites located in different eco-climatic areas in Côte d’Ivoire during the dry and rainy seasons. Tsetse flies were caught during five consecutive days using biconical traps, dissected and microscopically examined looking for trypanosome infection. Samples from infected flies were tested by PCR using specific primers for Trypanosoma brucei s.l., T. congolense savannah type, T. congolense forest type and T. vivax. Of 1941 tsetse flies caught including four species, i.e. Glossina palpalis palpalis, G. p. gambiensis, G. tachinoides and G. medicorum, 513 (26%) were dissected and 60 (12%) were found positive by microscopy. Up to 41% of the infections were due to T. congolense savannah type, 30% to T. vivax, 20% to T. congolense forest type and 9% due to T. brucei s.l. All four trypanosome species and subgroups were identified from G. tachinoides and G. p. palpalis, while only two were isolated from G. p. gambiensis (T. brucei s.l., T. congolense savannah type) and G. medicorum (T. congolense forest, savannah types). Mixed infections were found in 25% of cases and all involved T. congolense savannah type with another trypanosome species. The simultaneous occurrence of T. brucei s.l., and tsetse from the palpalis group may suggest that human trypanosomiasis can still be a constraint in these localities, while high rates of T. congolense and T. vivax in the area suggest a potential risk of animal trypanosomiasis in livestock along the Comoé River. PMID:26035296

  10. Detection and identification of pathogenic trypanosome species in tsetse flies along the Comoé River in Côte d'Ivoire.

    PubMed

    Djohan, Vincent; Kaba, Dramane; Rayaissé, Jean-Baptiste; Dayo, Guiguigbaza-Kossigan; Coulibaly, Bamoro; Salou, Ernest; Dofini, Fabien; Kouadio, Alain De Marie Koffi; Menan, Hervé; Solano, Philippe

    2015-01-01

    In order to identify pathogenic trypanosomes responsible for African trypanosomiasis, and to better understand tsetse-trypanosome relationships, surveys were undertaken in three sites located in different eco-climatic areas in Côte d'Ivoire during the dry and rainy seasons. Tsetse flies were caught during five consecutive days using biconical traps, dissected and microscopically examined looking for trypanosome infection. Samples from infected flies were tested by PCR using specific primers for Trypanosoma brucei s.l., T. congolense savannah type, T. congolense forest type and T. vivax. Of 1941 tsetse flies caught including four species, i.e. Glossina palpalis palpalis, G. p. gambiensis, G. tachinoides and G. medicorum, 513 (26%) were dissected and 60 (12%) were found positive by microscopy. Up to 41% of the infections were due to T. congolense savannah type, 30% to T. vivax, 20% to T. congolense forest type and 9% due to T. brucei s.l. All four trypanosome species and subgroups were identified from G. tachinoides and G. p. palpalis, while only two were isolated from G. p. gambiensis (T. brucei s.l., T. congolense savannah type) and G. medicorum (T. congolense forest, savannah types). Mixed infections were found in 25% of cases and all involved T. congolense savannah type with another trypanosome species. The simultaneous occurrence of T. brucei s.l., and tsetse from the palpalis group may suggest that human trypanosomiasis can still be a constraint in these localities, while high rates of T. congolense and T. vivax in the area suggest a potential risk of animal trypanosomiasis in livestock along the Comoé River. PMID:26035296

  11. Percepción de competencia y adiestramiento profesional especializado relativos al VIH/SIDA en estudiantes y profesionales de la salud: el estigma como un indicador de necesidad

    PubMed Central

    RODRÍGUEZ, Yarimar ROSA; DÍAZ, Nelson VARAS

    2009-01-01

    El proceso de estigmatización asume una devaluación de la persona debido a una característica o marca que haya sido identificada socialmente y que permita que se le describa como diferente. Desde que se desató la epidemia del VIH/SIDA, vivir con la enfermedad ha sido señalado de manera social como una marca estigmatizante. Las manifestaciones de dicha estigmatización se han documentado entre profesionales de la salud. Este estigma puede afectar los servicios de salud que las personas que viven con VIH/SIDA reciben de estos profesionales. Los objetivos de esta investigación fueron explorar: 1) la percepción que tienen estudiantes y profesionales de la salud sobre su nivel de competencia para ofrecer servicios a personas que viven con VIH/SIDA, 2) las opiniones de éstos sobre el tipo de adiestramiento profesional recibido y la necesidad del mismo, y 3) la manifestación de actitudes estigmatizantes como indicadores de necesidad de adiestramiento profesional. La muestra total del estudio estuvo compuesta por 80 de diversas profesiones de la salud. Los resultados reflejan que algunos/as de los/as participantes han recibido formación en VIH pero ésta no ha sido suficiente para contrarrestar las nociones estigmatizantes. Discutimos las implicaciones de los resultados para investigaciones futuras y el desarrollo de intervenciones con vías de minimizar las nociones estigmatizantes en los escenarios de salud. PMID:20011236

  12. The Astronomy Club of Araranguá: Educating Science Teachers as Science Communicators. (Breton Title: Clube de Astronomia de AraranguÁ: a Formação de Professores de Ciências Como Divulgadores Científicos. ) Club de Astronomía de Araranguá: la Formación del Profesorado Como Comunicadores de la Ciencia

    NASA Astrophysics Data System (ADS)

    Damasio, Felipe; Allain, Olivier; Antunes Rodrigues, Adriano

    2013-07-01

    The study reported in this work takes place since 2009 at the Federal Institute of Education, Science and Technology of Santa Catarina, Campus Araranguá. Our main goal is to help form teachers, training undergraduate students in Natural Sciences with specialization in Physics as science communicators, as well as to promote actions of broader scientific popularization in the region of the town of Araranguá through an Astronomy Club called CA2. Among the actions of scientific popularization that the students promote are: video production, radio broadcasts, lectures, nightly observations, preparation and exhibition of posters, physics teaching for children, continuing education activities for teachers and regular physics teaching using Astronomy as a theme. The Club's teacher education and scientific dissemination work is based on the Theory of Meaningful Learning, always trying to reach the student's predisposition to learn and produce potentially meaningful material, the two essential conditions for meaningful learning to occur. O estudo que este trabalho relata ocorre desde 2009 no Instituto Federal de Educação, Ciência e Tecnologia de Santa Catarina, campus Araranguá. Nele procura-se formar divulgadores científicos durante a formação inicial de docentes do curso de Licenciatura em Ciências da Natureza com habilitação em Física, além de promover ações de divulgação científica para o público geral da região da cidade de Araranguá por meio de um Clube de Astronomia chamado CA² (Clube de Astronomia de Araranguá). Entre as ações de divulgação científica que os licenciandos promovem estão: produção de vídeos, programas de rádio, palestras, observações noturnas, confecção e exposição de pôsteres, ensino de física para crianças, formação continuada de professores em atividades e ensino de Física regular utilizando a Astronomia como tema gerador. O trabalho de formação docente e divulgação científica do Clube fundamenta

  13. Como Lo Hago Yo: Lipomas Medulares

    PubMed Central

    Portillo, Santiago

    2014-01-01

    Basados en la experiencia de 82 casos; en 5% se observaron anomalías pélvicas asociadas. En los menores de 3 años el motivo de consulta (85%) fue la tumoración. En los mayores de 3 años (42%) tenía problemas neurológicos. Solo el 24% preocupados por la tumoración. El objetivo de la cirugía es desanclar la médula y no remover la totalidad del lipoma. El lipoma de filum es el que es mas simple para operar. Aún cuando la escuela francesa propone operar solamente cuando hay síntomas favorezco cirugía preventiva. Favorezco una segunda cirugía si hay signos de anclaje postoperatorio, aún cuando observamos empeoramiento postoperatorio motor en 2.5% de los operados y urológico a largo plazo en 6% de los operados. PMID:24791218

  14. Micoinseticidas e Micoacaricidas no Brasil: Como estamos?

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Mycoinsecticides and mycoacaricides can be defined as biopesticide products based on living propagules of entomopathogenic fungi developed for inundative and inoculative biological control of insects and mites. Based on recently published data on global use of entomopathogenic fungi and a proposal f...

  15. Particle-associated contaminants in street dust, parking lot dust, soil, lake-bottom sediment, and suspended and streambed sediment, Lake Como and Fosdic Lake watersheds, Fort Worth, Texas, 2004

    USGS Publications Warehouse

    Wilson, Jennifer T.; Van Metre, Peter C.; Werth, Charles J.; Yang, Yanning

    2006-01-01

    A previous study by the U.S. Geological Survey of impaired water bodies in Fort Worth, Texas, reported elevated but variable concentrations of particle-associated contaminants (PACs) comprising chlorinated hydrocarbons, polycyclic aromatic hydrocarbons, and trace elements in suspended and bed sediment of lakes and streams affected by urban land use. The U.S. Geological Survey, in cooperation with the City of Fort Worth, collected additional samples during October 2004 to investigate sources of PACs in the watersheds of two impaired lakes: Lake Como and Fosdic Lake. Source materials and aquatic sediment were sampled and analyzed for PACs. Source materials sampled consisted of street dust and soil from areas with residential and commercial land use and parking lot dust from sealed and unsealed parking lots. Aquatic sediment sampled consisted of bottom-sediment cores from the two lakes and suspended and streambed sediment from the influent stream of each lake. Samples were analyzed for chlorinated hydrocarbons (organochlorine pesticides and polychlorinated biphenyls), polycyclic aromatic hydrocarbons, major and trace elements, organic carbon, grain size, and radionuclides.

  16. Essays on Eclipses, Transits and Occultations as Teaching Tools in the Introductory Astronomy College Course. (Spanish Title: Ensayos sobre Eclipses, Tránsitos y Ocultaciones Como Herramientas de Enseñanza en el Curso Universitario Introductorio a la Astronomía.) Ensaios sobre Eclipses, Trânsitos e Ocultações Como Ferramentas de Ensino em um Curso Universitário Introdutório de Astromomia

    NASA Astrophysics Data System (ADS)

    Dcruz, Noella L.

    2014-07-01

    estudiantes que escribieran dos ensayos cortos de tres que se proponían. Los ensayos contenían partes descriptivas y conceptuales. Los mismos estaban destinados a servir como herramientas de enseñanza. 62% de los 106 ensayos de 55 estudiantes obtuvo grados A, B o C. 21% de los 47 encuestados que respondieron al cuestionario posterior consideró que los ensayos aumentaron su interés por la astronomía. 49% de los encuestados consideró que los ensayos no eran educacionalmente útiles y que no deben ser propuestos de nuevo. Las respuestas escritas más comunes a nuestra encuesta indicaran que los estudiantes necesitan más orientación y una mejor preparación en la redacción de ensayos exitosos. Dado que los estudiantes encontraron las piezas conceptuales de los ensayos difíciles, en el futuro vamos a ofrecer actividades pertinentes antes de los plazos de redacción para ayudar a los estudiantes a crear ensayos de mayor calidad. Nós ocasionalmente incluímos projetos em nosso curso universitário introdutório centrado no aluno para permitir aos estudantes que pertencem às carreiras não científicas explorar alguns conceitos astronômicos em mais detalhes do que o normal. Tais projetos também enfatizam eventos astronômicos em curso ou futuros. Esperamos que os alunos se sintam mais interessados na astronomia através de projetos ligados a eventos astronômicos. No termo de Primavera de 2012 (EUA), propomos ensaios curtos focados em eclipses, trânsitos e ocultações para promover o raro trânsito de Vênus que ocorreu no dia 5 de junho de 2012. Pedimos aos alunos que escrevessem dois ensaios curtos dentre três que foram propostos. Os ensaios continham partes descritivas e conceituais. Eles foram feitos para servir como ferramentas de ensino. 62% de 106 ensaios de 55 alunos ganhou graus A, B ou C. 21% dos 47 entrevistados que responderam ao levantamento posterior sentiu que os ensaios aumentaram seu interesse na astronomia. 49% dos inquiridos consideraram que os

  17. El Espanol como Idioma Universal (Spanish as a Universal Language)

    ERIC Educational Resources Information Center

    Mijares, Jose

    1977-01-01

    A proposal to transform Spanish into a universal language because it possesses the prerequisites: it is a living language, spoken in several countries; it is a natural language; and it uses the ordinary alphabet. Details on simplification and standardization are given. (Text is in Spanish.) (AMH)

  18. [Parenting Information. Informacion Sobre Como Ser Padres Mejores.

    ERIC Educational Resources Information Center

    Moreno, Steve

    These five booklets, containing information on how parenting can effect children's school achievement, are part of a series of 22 innovative booklets designed specifically to help parents understand and help their children learn. Booklet #1, "Parents--Teach Your Children to Learn [Before They Go to School]," defines intelligence and suggests…

  19. Understanding Your Child's Learning Differences = Entienda como aprende su hijo.

    ERIC Educational Resources Information Center

    Fielding, Elizabeth N.

    Children who are bright and hard-working, yet find school a struggle, or children who can discuss things they have learned but whose written work is of surprisingly poor quality, might have learning differences that are hindering them from reaching their full potential. Some children are visual learners, others are auditory learners, and others…

  20. Como Planear Mi Vida = Make a Life for Yourself.

    ERIC Educational Resources Information Center

    Haffner, Debra; Casey, Sean

    This booklet for teenagers about life planning is presented in parallel English and Spanish versions with a special focus on young Hispanics growing up in America. It discusses hopes and dreams that adolescents may have and gives tips for reaching goals. A sentence completion exercise is included to help readers set goals. Four important goals for…

  1. Los mitos como memoria colectiva de Los Pueblos.

    NASA Astrophysics Data System (ADS)

    Martín, P. T.

    Myths are essentially something practical that allows those who believe in them to solve any ambiguity which could come up in their relation with nature. Since they bring information about the condition of the reality to which they belong, they are but the appropriate instrument to insert nature into culture by actually achieving an adaptation to the environment. The purpose of this essay is to show how the deification of plants, animals, and stars, which are present in the daily lives of "Amerindian" people, not only constitutes a source of rich mythology but also turns out to be an effective measure towards the continuity of social groups. Similarities or identifications between human life and the life of plants, animals and stars as well as mutual interplay are somehow present in those myths: stars which create or are changed into human being, animals or plants; human beings who create or are transformed into astral bodies; battles between peoples and stars, etc. On this base, mythology can provide not only keys to show how certain human groups have achieved their adaptation to the environment and how the different social systems and their relations to nature have developed, but also hints of changes which have taken place in other heavenly spheres such as the falling of meteors, the appearance of comets or any other significant events of this kind in the lives of these groups.

  2. Make a Life for Yourself = Como Planear Mi Vida.

    ERIC Educational Resources Information Center

    Center for Population Options, Washington, DC.

    This booklet was devised to help Hispanic teenagers develop a life plan. It provides information for making decisions, and is written in both English and Spanish. Tips are provided for setting goals. A sentence-completion task helps the teenager focus on specific issues, and use concrete language when talking about the goals. Specific goals are…

  3. Como Lo Hago Yo: Tratamiento Quirurgico Del Mielomeningocele

    PubMed Central

    Portillo, Santiago

    2014-01-01

    En Argentina hay plan de fortificación con ácido fólico. Diagnostico prenatal no siempre es correcto. Cierre según técnica. Cerramos músculo. No favorecemos corpectomía temprana en casos de cifosis. Suturamos la plaqueta. Cerramos el plano muscular. Hidrocefalia: Válvula de derivación, generalmente dentro de los dos primeros meses. Ventriculostomía no está indicada. Chiari II. Laminectomia cervical alta. Siringomielia: Derivación desde la cavidad al peritoneo. PMID:24791219

  4. Archaebakterien und Phylogenie der Organismen

    NASA Astrophysics Data System (ADS)

    Kandler, Otto

    1981-04-01

    The determination of the sequence similarity of the ribosomal 16 S RNA of many bacteria and a few higher organisms has shown that the methanogenic, halophilic, and acido-thermophilic organisms are phylogenetically separated from the kingdoms of the Eubacteria and Eukaryotes thus representing a third kingdom called “Archaebacteria”. Many biochemical and molecular biological features support this conclusion.

  5. Inhibition of fructan-fermenting equine fecal bacteria and Streptococcus bovis by hops (Humulus lupulus L.) ß-acid

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Aims: The goals were to determine if the '-acid from hops (Humulus lupulus L.) could be used to control fructan fermentation by equine hindgut microorganisms, and to verify the antimicrobial mode of action on the Streptococcus bovis, which has been implicated in fructan fermentation, hindgut acidos...

  6. Spanish Oral Language Guide: Kindergarten Level. Espanol como Segundo Idioma. Teacher's Guide: Level I.

    ERIC Educational Resources Information Center

    Corbell, Gloria; And Others

    This teacher's guide to Spanish language at the kindergarten level includes a recommended subject presentation sequence for the Spanish curriculum, a sample schedule, a grouping of students using three stations, and a classroom layout. The grouping would be effective when at least one-third of the children are Spanish-speaking or bilingual. The…

  7. Como Ayudar a sus Hijos a Aprender Ciencia (Helping Your Child Learn Science).

    ERIC Educational Resources Information Center

    Paulu, Nancy; Martin, Margery

    Because most parents say they do not or cannot help their children with science, this booklet was designed to help them do so, easily and with pleasure for both parent and child. The introduction presents information on why and how parents should help their children and provides a general orientation to the ideas and activities offered in the…

  8. Cosmic ray soil moisture observing systems comos in cap fields at El Reno Oklahoma

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Soil water content (SWC) partitions rainfall into runoff and infiltration, modulates surface and atmospheric exchanges of water and energy, affects plant growth and crop yields, and impacts chemical and biological activities of soil, among other things. Thus, SWC, especially over large scales, is a...

  9. International Perspectives on Affirmative Action. A Bellagio Conference (Lake Como, Italy, August 16-20, 1982).

    ERIC Educational Resources Information Center

    Rockefeller Foundation, New York, NY.

    This volume presents nine papers read at a conference on affirmative action, sponsored by the Rockefeller Foundation and held at Columbia University in August 1982; a preface, summary paper, and list of participants are also included. Each paper addresses the issue of affirmative action within a different country and describes: (1) the policies…

  10. Contributions of local knowledge to the physical limnology of Lake Como, Italy

    PubMed Central

    Laborde, Sarah; Imberger, Jörg; Toussaint, Sandy

    2012-01-01

    This article shows how local knowledge may be valuably integrated into a scientific approach in the study of large and complex hydrological systems where data collection at high resolution is a challenge. This claim is supported through a study of the hydrodynamics of a large lake where qualitative data collected from professional fishers was combined with theory to develop a hypothesis that was then verified by numerical modeling. First the fishermen’s narratives were found to describe with accuracy internal wave motions that were evident in water column temperature records, which revealed their practical knowledge of the lake’s hydrodynamics. Second, local knowledge accounts emphasized the recurrent formation of mesoscale gyres and return flows in certain zones of the lake in stratified conditions, which did not appear in the physical data because of limitations of sampling resolution. We hypothesized that these features developed predominantly because of the interaction of wind-driven internal motions with the lake’s bathymetry, and the Earth’s rotation in the widest areas of the basin. Numerical simulation results corroborated the fishers’ descriptions of the flow paths and supported the hypothesis about their formation. We conclude that the collaboration between scientific and local knowledge groups, although an unusual approach for a physical discipline of the geosciences, is worth exploring in the pursuit of a more comprehensive understanding of complex geophysical systems such as large lakes. PMID:22493231

  11. La tasa de decaimiento del ciclo solar como indicador de actividad

    NASA Astrophysics Data System (ADS)

    Buccino, A. P.; Mauas, P. J. D.

    The length of the solar cycle has been linked to solar forcing of global climate. Usually, cycle length is defined as the time difference between consecutive sunspot minima. However, sunspot minima is determined both by the diminishing number of spots of the old cycle and by the increasing number of spots of the new one. Therefore, the date of the minimum depends on the properties of both cycles, and is generally ill defined. Furthermore, changes in solar activity should precede climatic changes. On the other hand, it has been suggested that the length of the cycle is related to changes in the Sun's convective energy transport, through the decay rate of individual sunspots. Here, using the concept of extended activity cycle, we define an activity index based on the decay rate of the cycle, and study its correlation with other indexes.

  12. Co/Mo bimetallic addition to electrolytic manganese dioxide for oxygen generation in acid medium.

    PubMed

    Delgado, Dario; Minakshi, Manickam; McGinnity, Justin; Kim, Dong-Jin

    2015-01-01

    An efficient electrocatalyst comprising inexpensive and earth-abundant materials for the oxygen evolution reaction (OER) is crucial for the development of water electrolysis. In this work, in-situ addition of cobalt/molybdenum ions to the electrolytic manganese dioxide has been shown to be beneficial for the OER in acid solution as its overpotential performed better (305 mV) than that of the commercial DSA(®) (341 mV) at 100 mA cm(-2). The OER was investigated at ambient temperature in 2 M H2SO4 solution on the modified EMD (MnMoCoO) electrodes. The energy efficiency of the MnMoCoO electrodes improved significantly with the amount of Co in the plating solution. For the electrodeposited catalysts, physico-chemical and electrochemical measurements were conducted including static overpotentials. The better performance of the modified EMD was attributed to an improved charge transfer resistance (Rct; 0.290 Ω cm(2)), average roughness factor (rf; 429) and decrease in water content in the electrodeposited catalysts. The kinetic parameters obtained on MnMoCoO catalysts were compared and discussed according to the cobalt concentration. PMID:26469204

  13. The New Room Arrangement as a Teaching Strategy = La Nueva Organizacion del Salon como Estrategia Educativa.

    ERIC Educational Resources Information Center

    Dodge, Diane Trister

    Many typical classroom behavior problems--running in the classroom, inability to make choices, failure to stick with activities, fighting over toys, and poor use of materials-- can be traced to how the room is arranged and how materials are displayed. By making a few changes in the classroom environment, early childhood teachers can create a…

  14. Co/Mo bimetallic addition to electrolytic manganese dioxide for oxygen generation in acid medium

    PubMed Central

    Delgado, Dario; Minakshi, Manickam; McGinnity, Justin; Kim, Dong-Jin

    2015-01-01

    An efficient electrocatalyst comprising inexpensive and earth-abundant materials for the oxygen evolution reaction (OER) is crucial for the development of water electrolysis. In this work, in-situ addition of cobalt/molybdenum ions to the electrolytic manganese dioxide has been shown to be beneficial for the OER in acid solution as its overpotential performed better (305 mV) than that of the commercial DSA® (341 mV) at 100 mA cm−2. The OER was investigated at ambient temperature in 2 M H2SO4 solution on the modified EMD (MnMoCoO) electrodes. The energy efficiency of the MnMoCoO electrodes improved significantly with the amount of Co in the plating solution. For the electrodeposited catalysts, physico-chemical and electrochemical measurements were conducted including static overpotentials. The better performance of the modified EMD was attributed to an improved charge transfer resistance (Rct; 0.290 Ω cm2), average roughness factor (rf; 429) and decrease in water content in the electrodeposited catalysts. The kinetic parameters obtained on MnMoCoO catalysts were compared and discussed according to the cobalt concentration. PMID:26469204

  15. Como ayudar a sus hijos a usar la biblioteca (Helping Your Child Use the Library).

    ERIC Educational Resources Information Center

    Perkinson, Kathryn

    Focusing on the cooperative role of parents and public libraries in stimulating reading interests in children of all ages, this booklet addresses the following issues: (1) getting children interested in reading (reading aloud to children; encouraging children to read to you; starting a home library; showing children that you enjoy reading;…

  16. Como Solicitar la Asistencia Economica Federal para Estudiantes (How To Apply for Federal Student Aid).

    ERIC Educational Resources Information Center

    Office of Federal Student Aid (ED), Washington, DC.

    This guide, written in Spanish, discusses reasons for going to college, how to pay for college, and how to apply for federal student aid in a series of brief, clear illustrations. Following outlines of financial benefits of college, college costs, and space to note costs for the student's area, the guide outlines these steps in the application…

  17. Co/Mo bimetallic addition to electrolytic manganese dioxide for oxygen generation in acid medium

    NASA Astrophysics Data System (ADS)

    Delgado, Dario; Minakshi, Manickam; McGinnity, Justin; Kim, Dong-Jin

    2015-10-01

    An efficient electrocatalyst comprising inexpensive and earth-abundant materials for the oxygen evolution reaction (OER) is crucial for the development of water electrolysis. In this work, in-situ addition of cobalt/molybdenum ions to the electrolytic manganese dioxide has been shown to be beneficial for the OER in acid solution as its overpotential performed better (305 mV) than that of the commercial DSA® (341 mV) at 100 mA cm-2. The OER was investigated at ambient temperature in 2 M H2SO4 solution on the modified EMD (MnMoCoO) electrodes. The energy efficiency of the MnMoCoO electrodes improved significantly with the amount of Co in the plating solution. For the electrodeposited catalysts, physico-chemical and electrochemical measurements were conducted including static overpotentials. The better performance of the modified EMD was attributed to an improved charge transfer resistance (Rct; 0.290 Ω cm2), average roughness factor (rf; 429) and decrease in water content in the electrodeposited catalysts. The kinetic parameters obtained on MnMoCoO catalysts were compared and discussed according to the cobalt concentration.

  18. Escuelas sin Drogas. Como Actuar. Edicion 1992. (Schools without Drugs. What Works. 1992 Edition).

    ERIC Educational Resources Information Center

    Department of Education, Washington, DC.

    Across the United States, schools and communities have found ways to turn the tide in the battle against drugs. This guidebook describes the methods they have used and the actions they have taken. The first section, "Children and Drugs" outlines the nature and extent of the drug problem and summarizes the latest research on the effects of drugs on…

  19. The Struggle for Mexico's First Gay-Straight Alliance: Como una Novela Real

    ERIC Educational Resources Information Center

    Macgillivray, Ian K.

    2006-01-01

    In 2004, a group of high school students at a private American school in Mexico City started the first gay-straight alliance in Mexico. A small group of conservative parents and a Mormon principal organized in opposition. This paper details the students' struggle to keep their club and offers lessons learned about student activism, school change,…

  20. "Tanto Necesitamos De Aqui Como Necesitamos De Alla": "Leer Juntas" among Mexican Transnational Mothers and Daughters

    ERIC Educational Resources Information Center

    de la Piedra, Maria Teresa

    2011-01-01

    This paper presents part of the results of a qualitative study about literacy practices of Mexican transnational mothers, who live in and frequently cross the border between two countries (the United States and Mexico). Drawing on sociocultural approaches to literacy and literature on transnationalism, I analyze one practice: "leer juntas"…

  1. Como Lo Hago Yo: Defectos Del Cierre Del Tubo Neural En Nicaragua

    PubMed Central

    Gonzalez, Juan Bosco

    2014-01-01

    En Nicaragua no hay un plan de forltificación de alimentos con ácido fólico. Las madres son muy jóvenes. En La Mascota operamos mas de cuarenta niños por año. Derivación tardía es un problema. La infección preoperatoria tiene que ser descartada. Vancomicina y Ceftriaxone estan indicadas. Estricta regla de asepsia operatoria. Suturamos la plaqueta para asemejar su forma al cilindro normal de la médula. No ceramos la capa de músculo. PMID:24791221

  2. Como pagar to educacion, 2004-2005 (Funding Your Education, 2004-2005).

    ERIC Educational Resources Information Center

    Office of Federal Student Aid (ED), Washington, DC.

    This publication, written in Spanish, describes financial aid programs of the U.S. Department of Education and advises students about paying for college. It outlines things a student should ask about college and how to obtain financial aid, whether grants, work-study, or loans. Chapters provide information on: (1) "Education after High School";…

  3. Como pagar tu educacion, 2003-2004 (How To Pay for Your Education, 2003-2004).

    ERIC Educational Resources Information Center

    Office of Federal Student Aid (ED), Washington, DC.

    This Spanish language booklet discusses paying for college. The guide presents information in question-and-answer form about things an applicant should ask and how to obtain financial aid. It describes the criteria for receiving aid and provides information about complying with aid requirements. The booklet also describes federal Pell grants and…

  4. Como si le Falta un Brazo: Latino Immigrant Parents and the Costs of Not Knowing English

    ERIC Educational Resources Information Center

    Worthy, Jo

    2006-01-01

    This study examined the perspectives of Latino/a immigrant parents about the place of English in their lives. The parents described how they had come to the United States with intentions of learning English, but various obstacles made it an overwhelming challenge. The author questions whether, despite rhetoric to the contrary, financially…

  5. Lewis acid tuned facial stereodivergent HDA reactions using beta-substituted N-vinyloxazolidinones.

    PubMed

    Gohier, Frédéric; Bouhadjera, Keltoum; Faye, Djibril; Gaulon, Catherine; Maisonneuve, Vincent; Dujardin, Gilles; Dhal, Robert

    2007-01-18

    The [4 + 2] acido-catalyzed heterocycloaddition between new beta-substituted N-vinyl-1,3-oxazolidin-2-ones (with R' = Me, Ar, CH2 Ar) and beta,gamma-unsaturated alpha-ketoesters (R = Ar) afforded heteroadducts with high levels of endo and facial selectivities. A complete reversal of facial differentiation was achieved by varying the Lewis acid, leading to the stereoselective formation of either endo-alpha or endo-beta adducts. [reaction: see text]. PMID:17217267

  6. How Families Teach, Support, Learn, Make Decisions: Ways for Families To Help Children Do Better in School = Como las Familias Ensenan, Apoyan, Aprenden, Toman Decisiones: Como las Familias Ayudan a los Ninos a Mejorar en la Escuela.

    ERIC Educational Resources Information Center

    RMC Research Corp., Hampton, NH.

    This booklet contains ideas about how families can help children in school in the following basic ways by: (1) teaching their children; (2) learning new things to help their children learn; (3) supporting children and the school; and (4) making decisions about what and how children learn. For each of these areas, a chart is included so that…

  7. Insertion of Astronomy as a High School Subject. (Spanish Title: Inserción de Astronomia Como Materia del Ciclo Secundario.) Inserção da Astronomia Como Disciplina Curricular do Ensino Médio

    NASA Astrophysics Data System (ADS)

    Dias, Claudio André C. M.; Santa Rita, Josué R.

    2008-12-01

    Astronomy is considered among the first sciences that man dominated, however, the basic skills for the construction of knowledge, relatively to the contents "Earth and the Universe" are not being developed properly for the majority of students concluding the high school level. The students are concluding this teaching cycle without proper knowledge of several subjects in the area of Astronomy, which are mandatory in the national Curricular National Parameters (PCN). Because of this discrepancy, this work stresses the need of the incorporation of a specific subject of Astronomy in the high school, in order to reduce the gap between what is taught and which should be taught. La Astronomía es considerada una de las primeras ciencias que el hombre dominó. Sin embargo, las habilidades básicas para la construcción del conocimento, relativo al eje temático "Tierra y Universo", no vienen siendo trabajadas adecuadamente con la mayoría de los alumnos que concluyen el ciclo escolar medio. Los alumnos están concluyendo este nivel de enseñanza sin conocimentos de varios temas en el área de Astronomía, que son obligatorios según los Parámetros Curriculares Nacionales (PCN). En virtud de esta discrepancia, este trabajo enfatiza la necesidad de incorporar una disciplina específica de Astronomía em el ciclo medio, em pro de la reducción de las distorsiones entre lo que es enseñado y lo que se debe enseñar. A Astronomia é considerada uma das primeiras ciências que o homem dominou, porém as competências básicas para a construção do conhecimento, relativo ao eixo temático "Terra e Universo", não vêm sendo trabalhadas a contento com a maioria dos alunos que concluem o ensino médio. Os alunos estão concluindo este nível de ensino sem conhecimento de vários temas na área de Astronomia, que são obrigatórios nos Parâmetros Curriculares Nacionais (PCN). Em virtude desta discrepância, este trabalho vem evidenciar a necessidade da incorporação de uma disciplina específica de Astronomia, no ensino médio, em prol da redução das distorções entre o que é ensinado e o que se deve ensinar.

  8. Caracteristicas de la Instruccion Programada como Tecnica de Ensenanza (Characteristics of Programed Instruction as a Teaching Technique).

    ERIC Educational Resources Information Center

    Dorrego, Maria Elena

    This discussion of programed instruction begins with the fundamental psychological aspects and learning theories behind this teaching method. Negative and positive reinforcement, conditioning, and their relationship to programed instruction are considered. Different types of programs, both linear and branching, are discussed; criticism of the…

  9. Contextualizacion y "Expresiones Pragmaticas": "Che" como Senal de Marco (Contextualization and "Pragmatic Expressions": "Che" as Deictic Marker).

    ERIC Educational Resources Information Center

    Carranza, Isolda

    The pragmatic expressions of Argentine Spanish (e.g., "bueno, viste, no? mira") are defined as deictic signals. They are deictic because they indicate elements of the communicative situation: transitions between text segments, conversational roles, or the social relationship between participants. They also signal contextual suppositions and help…

  10. El doblete D del Sodio como indicador de la actividad cromosférica en estrellas de la secuencia principal

    NASA Astrophysics Data System (ADS)

    Díaz, R. F.; Mauas, P. J. D.

    We study the line profile of the sodium D doublet (5890 A and 5896 A) in dwarf stars with spectral type between M5.5 and F6. We find that the equivalent width of these lines shows a very good correlation with spectral type for stars later than K4. The flux absorbed in this region of the spectrum is then compared with the flux absorbed in the calcium H&K lines -a traditional activity indicator. For stars with (B-V)> 1.15 the correlation between absorbed fluxes is good and hence the sodium doublet is a good activity indicator. Since the doublet is found at longer wavelenghts than the calcium H & K lines, it is particularly useful for the study of chromospheric activity in late-type stars.

  11. La Traduccion Simultanea como Materia en Una Carrera de Lenguas (Simultaneous Translation as a Course in a Foreign Language Program)

    ERIC Educational Resources Information Center

    Bradley, D.

    1977-01-01

    A description of the foreign language curriculum at the university level in which courses in simultaneous translation are required. The size and composition of the groups are described as well as methods used to develop skill in translating and interpreting. Results are assessed. (Text is in Spanish.) (AMH)

  12. How To Start a Family Day Care = Como Iniciar una Guarderia en El Hogar. [Videotape and Viewer's Guide].

    ERIC Educational Resources Information Center

    Raphael, Doris; Weisman, Douglas

    Being a family day care provider is work that requires professional responsibilities and attention to the physical, emotional, and educational well-being of children; listening and responding to parents; and running a business. This videotape, in English- and Spanish-language versions, explores the elements involved in starting up a family day…

  13. Como ayudar a los padres a prevenir el envenenamiento por plomo (Helping Parents Prevent Lead Poisoning). ERIC Digest.

    ERIC Educational Resources Information Center

    Binns, Helen J.; Ricks, Omar Benton

    Children are at greater risk than adults for lead poisoning because children absorb lead more readily than adults, and a small amount of lead in children's bodies can do a great deal of harm. This Spanish-language Digest summarizes some of the causes and effects of childhood lead poisoning and suggests some lead poisoning prevention strategies…

  14. The English as a Foreign Language/Lingua Franca Debate: Sensitising Teachers of English as a Foreign Language towards Teaching English as a Lingua Franca (El debate del inglés como lengua extranjera o como lengua franca: sensibilización de docentes de inglés como lengua extranjera hacia la enseñanza del inglés como lengua franca)

    ERIC Educational Resources Information Center

    Mansfield, Gillian; Poppi, Franca

    2012-01-01

    The function of English as a lingua franca for communication needs rethinking in the teaching of English as a foreign language classroom as a consequence of globalisation. The present contribution is an empirical study carried out in an Italian university environment which aims to show how teachers should take on board awareness raising activities…

  15. How Can We Provide Safe Playgrounds? = Como podemos proveer lugares con juegos infantiles que no sean peligrosos para los ninos?

    ERIC Educational Resources Information Center

    ACCESS ERIC, Rockville, MD.

    Outdoor playgrounds can be exciting places where children explore their environment and develop motor and social skills; however, they can also pose serious safety hazards. With the exception of California, no mandatory state or federal standards currently exist regarding manufacture or installation of playground equipment or surfaces. The…

  16. Parámetros fundamentales de objetos catalogados como cúmulos estelares en la Nube Mayor de Magallanes

    NASA Astrophysics Data System (ADS)

    Piatti, A. E.

    We present the results of 16 Large Magellanic Cloud (LMC) clusters ob- tained for the first time from CCD Washington CT1 T2 photometry. CMD cluster features turn out to be identifiable when performing annular extrac- tions around their respective centres, once they were cleaned from field star contamination; their main sequences extending from one up to four mag- nitudes downwards. The clusters resulted to be small angular size objects projected or immersed in dense star fields, as judged from their radial stellar density profiles, so that crowding effect could be responsible for the limited magnitude reached in some cases. We estimated their ages from isochrone fitting - along with the E(B - V ) colour excesses - assuming a metallicity of Z = 0.008 ([Fe/H] = -0.4 dex) and a LMC distance modulus of (m - M)o = 18.50 ± 0.10 mag. FULL TEXT IN SPANISH

  17. "Tras de un Amoroso Lance" como Estructura Expresiva (The Poem, "Behind the Amorous Cast" as an Expressive Structure).

    ERIC Educational Resources Information Center

    Bratosevich, Nicolas

    1967-01-01

    An analysis of a poem by San Juan de la Cruz (St. John of the Cross), the sixteenth century Spanish mystic, identifies symbols and images, explains themes, and offers a synthesis of his structural patterns. The poem, "Tras de amoroso lance", deals with the theme of the search of the beloved (i.e., the soul) for the lover, and incorporates the…

  18. Significant Learning Experiences for English Foreign Language Students (Experiencias significativas para estudiantes de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Becerra, Luz María; McNulty, Maria

    2010-01-01

    This action research examines experiences that students in a grade 10 EFL class had with redesigning a grammar-unit into a topic-based unit. Strategies were formulating significant learning goals and objectives, and implementing and reflecting on activities with three dimensions of Dee Fink's (2003) taxonomy of significant learning: the human…

  19. Las líneas de aluminio neutro como diagnóstico cromosférico

    NASA Astrophysics Data System (ADS)

    Fernández Borda, R.; Mauas, P. J. D.

    Se presenta un modelo atómico para el cálculo de las lí neas del Aluminio neutro que se forman en la cromósfera solar. En particular, se estudia la línea λ 3961 Å, que, por estar muy próxima a la lí nea H del Ca II y a Hɛ es muy frecuentemente observada. Observaciones en esta lí nea obtenidas con el espectrógrafo a instalarse en el CASLEO, serán utilizadas para el estudio de fulguraciones solares.

  20. Comparative Studies on Biochemical Properties of Protein Synthesis of an Archae-Bacteria Thermoplasma-Sp

    NASA Astrophysics Data System (ADS)

    Ohba, Masayuki; Oshima, Tairo

    1982-12-01

    An acido-thermophillic archaebacteria,Thermoplasma strain KO-2, produced poly(A) containing RNA. The isolated poly(A)RNA showed the messenger activity in a cell-free extract of rabbit reticulocyte, indicating that the RNA is mRNA of the archaebacteria. 7-Methylgluanosine 5'-phosphate did not inhibit the reaction, suggesting that the cap structure is not present in the messenger. These results may suggest that poly(A) containing messenger arised at very early stage of evolution prior to the divergence between archaebacteria and eukaryotes.

  1. [Childhood memories…].

    PubMed

    Uguen, Arnaud; Schoenlaub, Patricia; Abalain, Marie-Louise; Grippari, Jean-Luc

    2012-06-01

    Leprosy is still a largely worldwide spread disease but rarely encountered in metropolitan France. Its identification implies a multidisciplinary clinical, pathological and bacteriological diagnosis which is necessary to an efficient antibiotic treatment against a crippling disease which remains curable. Here we report the case of a 24-year-old man who was showing an original both cutaneous and pulmonary presence of acido-alcooloresistant bacillus which have been identified as Mycobacterium leprae by polymerase chain reaction (PCR). This unusual presentation of a cutaneous and pulmonary leprosy raises the problem of its differential diagnoses, including those of non-tuberculosis mycobacterial infections. PMID:22748342

  2. FT-IR characterization of the acidic and basic sites on a nanostructured aluminum nitride surface

    SciTech Connect

    Baraton, M.I.; Chen, X.; Gonsalves, K.E.

    1997-12-31

    A nanostructured aluminum nitride powder prepared by sol-gel type chemical synthesis is analyzed by Fourier transform infrared spectrometry. The surface acidic and basic sites are probed out by adsorption of several organic molecules. Resulting from the unavoidable presence of oxygen, the aluminum nitride surface is an oxinitride layer in fact, and its surface chemistry should present some analogies with alumina. Therefore, a thorough comparison between the acido-basicity of aluminum nitride and aluminum oxide is discussed. The remaining nitrogen atoms in the first atomic layer modify the acidity-basicity relative balance and reveals the specificity of the aluminum nitride surface.

  3. First principle study of the surface reactivity of layered lithium oxides LiMO2 (M = Ni, Mn, Co)

    NASA Astrophysics Data System (ADS)

    Vallverdu, Germain; Minvielle, Marie; Andreu, Nathalie; Gonbeau, Danielle; Baraille, Isabelle

    2016-07-01

    LiNixMnyCo1 - x - yO2 compounds (NMC) are layered oxides widely used in commercial lithium-ion batteries at the positive electrode. Nevertheless surface reactivity of this material is still not well known. As a first step, based on first principle calculations, this study deals with the electronic properties and the surface reactivity of LiMO2 (M = Co, Ni, Mn) compounds, considering the behavior of each transition metal separately in the same R 3 ̅ mα-NaFeO2-type structure, the one of LiCoO2 and NMC. For each compound, after a brief description of the bare slab electronic properties, we explored the acido-basic and redox properties of the (110) and (104) surfaces by considering the adsorption of a gaseous probe. The chemisorption of SO2 produces both sulfite or sulfate species associated respectively to an acido-basic or a reduction process. These processes are localized on the transition metals of the first two layers of the surface. Although sulfate species are globally favored, a different behavior is obtained depending on both the surface and the transition metal considered. We conclude with a simple scheme which describes the reduction processes on the both surfaces in terms of formal oxidation degrees of transition metals.

  4. Finding an Appropriate Preschool for Your Child with Special Needs = Como Encontrar un Programa Pre-escolar para su nino con desabilidades.

    ERIC Educational Resources Information Center

    Bernstein, Sandra; Wonderlick, Mary; Madden, Drina

    This booklet, with English and Spanish versions, provides a step-by-step procedure to help families find an appropriate preschool program in the community for their child with disabilities. The booklet lists six steps for locating a program: (1) decide what kind of program is wanted for the child; (2) complete included form outlining child's needs…

  5. Sound in ecclesiastical spaces in Cordoba. Architectural projects incorporating acoustic methodology (El sonido del espacio eclesial en Cordoba. El proyecto arquitectonico como procedimiento acustico)

    NASA Astrophysics Data System (ADS)

    Suarez, Rafael

    2003-11-01

    This thesis is concerned with the acoustic analysis of ecclesiastical spaces, and the subsequent implementation of acoustic design methodology in architectural renovations. One begins with an adequate architectural design of specific elements (shape, materials, and textures), with the intention of elimination of acoustic deficiencies that are common in such spaces. These are those deficiencies that impair good speech intelligibility and good musical audibility. The investigation is limited to churches in the province of Cordoba and to churches built after the reconquest of Spain (1236) and up until the 18th century. Selected churches are those that have undergone architectural renovations to adapt them to new uses or to make them more suitable for liturgical use. The thesis attempts to summarize the acoustic analyses and the acoustical solutions that have been implemented. The results are presented in a manner that should be useful for the adoption of a model for the functional renovation of ecclesiastical spaces. Such would allow those involved in architectural projects to specify the nature of the sound, even though somewhat intangible, within the ecclesiastical space. Thesis advisors: Jaime Navarro and Juan J. Sendra Copies of this thesis written in Spanish may be obtained by contacting the advisor, Jaime Navarro, E.T.S. de Arquitectura de Sevilla, Dpto. de Construcciones Arquitectonicas I, Av. Reina Mercedes, 2, 41012 Sevilla, Spain. E-mail address: jnavarro@us.es

  6. La anglofonia y literaturas poscoloniales en la ensenanza de ingles como lengua extranjera (Anglophonism and Postcolonial Literature in Teaching English as a Second Language).

    ERIC Educational Resources Information Center

    Zoreda, Margaret Lee

    This paper, written in Spanish, focuses on the instruction of English as a Second Language in the context of cultural understanding, rather than from a purely linguistic point of view. It argues that foreign language instruction should include lessons in the field of sociology, anthropology, history, geography, politics, the arts, and popular…

  7. Prevalence of sarcopenia among community‐dwelling elderly of a medium‐sized South American city: results of the COMO VAI? study

    PubMed Central

    Bielemann, Renata M.; Gonzalez, Maria Cristina; Menezes, Ana Maria B.

    2015-01-01

    Abstract Background There is insufficient data concerning sarcopenia prevalence in South America. The aim of this study was to estimate sarcopenia prevalence and its clinical subgroups in a Southern Brazilian city. Methods A cross‐sectional population‐based study was performed among community‐dwelling elderly aged 60 years or over. Subjects were evaluated according to the European Working Group on Sarcopenia in Older People established criteria. Muscle mass was estimated by calf circumference (CC). Cut‐off CC points were defined by a subsample's dual X‐ray absorptiometry estimation of the appendicular skeletal muscle mass index (ASMI), which was subsequently compared with the values of a young adult population from the same city. Muscle strength was measured by manual dynamometry. Muscle performance was assessed through the 4 m gait speed test. Results The three diagnostic tests were performed in 1291 subjects. CC of ≤34 cm (males) and ≤33 cm (females) were defined as indicatives of low ASMI. The overall sarcopenia prevalence was 13.9% (CI95% 12.0; 15.8%). Its frequency was significantly higher among elderly with low schooling, without a partner, with low socioeconomic status, smokers, inactive, and with low body mass index. A higher prevalence of pre‐sarcopenia was found in the youngest elderly; a higher prevalence of the clinical stages of the syndrome was found in older age groups. Conclusions Approximately one in ten elderly aged 60–69 years was in the preclinical stage of the disease. This is the age group in which public policies should focus to establish early diagnosis and prevent clinical progression of the syndrome. PMID:27493867

  8. Planeamiento de la unidad didactica en le ensenanza del ingles como idioma extranjero (Planning the Teaching Unit in the Instruction of English as a Foreign Language).

    ERIC Educational Resources Information Center

    Medina T., Rene

    1971-01-01

    This paper discusses the use of the teaching unit as a means for organization in English-as-a-foreign-language classes. It lists the essential elements in the construction of such a unit: cultural topic, linguistic elements, time period, main objectives, instructional materials, focus, specific activities, intended results, evaluation techniques,…

  9. Como evalvar la actuacion del profesor en una clase de segundo idioma (How to Evaluate a Teacher in a Second Language Classroom).

    ERIC Educational Resources Information Center

    Galvez de Bracamonte, Teresa

    This guide in Spanish provides performance criteria for evaluating the foreign language teacher. It provides an outline for analyzing the teacher's actions and teaching methods in the classroom. Through the evaluation by an outsider, the teacher can learn his or her faults in the views of others and can improve on them. The aspects to be analyzed…

  10. Estudio de NIH indica que la actividad física en tiempo libre alarga la vida tanto como 4,5 años

    Cancer.gov

    La actividad física en tiempo libre está asociada con una expectativa de vida más larga, aun en un grado de actividad relativamente bajo e independientemente del peso corporal, de acuerdo con un estudio llevado a cabo por un equipo de investigadores del I

  11. Como los padres ocupados pueden ayudar a sus hijos a aprender y desarrollarse (How Busy Parents Can Help Their Children Learn and Develop). Early Childhood Digest.

    ERIC Educational Resources Information Center

    Mayer, Ellen; Kreider, Holly; Vaughan, Peggy

    Although parents are often very busy with work and family responsibilities, there are many things they can do to help their school-age children learn and develop. This Spanish-language early childhood digest for parents provides tips obtained from parents of first and second graders in the School Transition Study on creative ways to stay involved…

  12. Emotions as Learning Enhancers of Foreign Language Learning Motivation (Las emociones como potenciadoras de la motivación en el aprendizaje de una lengua extranjera)

    ERIC Educational Resources Information Center

    Méndez López, Mariza G.; Peña Aguilar, Argelia

    2013-01-01

    The present article reports on a study that explores the effects of the emotional experiences of Mexican language learners on their motivation to learn English. In this qualitative research we present how emotions impact the motivation of university language learners in south Mexico. Results suggest that emotions, both negative and positive,…

  13. The Why, What, and How of a Bilingual Approach for Young Children [and] El Porque, el Cual y el Como de un Enfoque Bilingue para Ninos Preescolares.

    ERIC Educational Resources Information Center

    Flores, Alfredo R.; Riley, Mary Tom

    This guide, in parallel English and Spanish volumes, provides information necessary for implementing bilingual/multicultural programs. Section 1 defines and describes the bilingual approach, examining instructional goals, rationale, philosophical justification, legal foundations, and practical considerations. Section 2 discusses attitudinal…

  14. The Nature of Recognition in TEFL Teachers' Lives (La naturaleza del reconocimiento en la vida de los maestros de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Scholes Gillingsde González, Barbara

    2011-01-01

    This article aims at sharing a vital issue that emerged from the findings of a qualitative research study into collective responses of teachers of English as a foreign language to an extended change process in their Mexican university context from 1989 to 2003. The data generation process employed was comprised of semi-structured interviews as…

  15. How To Talk to Your Teens and Children about AIDS = Como hablar con sus adolescentes y sus ninos sobre el SIDA.

    ERIC Educational Resources Information Center

    National PTA, Chicago, IL.

    Two brochures, one in English and one in Spanish, provide parents with basic information that will enable them to educate their children about Acquired Immune Deficiency Syndrome (AIDS). Contents address 11 questions: (1) What is AIDS? (2) How do you get AIDS? (3) How is AIDS not spread? (4) Who can get AIDS? (5) How can you tell if someone has…

  16. Estadísticas de visitas en portales web institucionales como indicador de respuesta del público a propuestas de divulgación

    NASA Astrophysics Data System (ADS)

    Lares, M.

    The presence of institutions on the internet is nowadays very important to strenghten communication channels, both internal and with the general public. The Córdoba Observatory has several web portals, including the official web page, a blog and presence on several social networks. These are one of the fundamental pillars for outreach activities, and serve as communication channel for events and scientific, academic, and outreach news. They are also a source of information for the staff, as well as data related to the Observatory internal organization and scientific production. Several statistical studies are presented, based on data taken from the visits to the official web pages. I comment on some aspects of the role of web pages as a source of consultation and as a quick response to information needs. FULL TEXT IN SPANISH

  17. Cidadania Negada: A Educacao como Instrumento de Combate a Pobreza no Brasil (Denial of Citizenship: Education as a Way to Fight Poverty in Brazil).

    ERIC Educational Resources Information Center

    Germano, Jose Willington

    1995-01-01

    Compares two compensatory social/educational programs developed by the Brazilian government in the last 15 years. States that although one was formulated during the military regime and one during the present government, they both combat poverty and encourage privatization. Concludes that this promotes a process that sees education as social…

  18. Tips for Parents on Keeping Children Drug Free = Consejos para Los Padres Sobre Como Mantener a Los Hijos Libres de La Droga.

    ERIC Educational Resources Information Center

    Department of Education, Washington, DC. Office of Intergovernmental and Interagency Affairs.

    Research shows that recent trends in youth drug use have stabilized; however, the rates of use remain at high levels. It has been shown that the earlier drug use is initiated, the more likely a person is to develop drug problems later in life. Youth substance abuse may lead to many other problems that affect not only the child, but also the…

  19. A+chieving Excellence. A Parent's Guide to Site-Based Decision Making. Noteworthy = A+lcanzar la Excelencia. Un manual para padres sobre como hacer decisiones. Notable.

    ERIC Educational Resources Information Center

    Hutchins, C. L.

    The parents' guide in English and Spanish versions, offers a synthesis of the Mid-Continent Regional Educational Laboratory's (McRel) "A+chieving Excellence," a 480-page manual on educational decision-making and management. Four sections examine four broad areas in which policies must be established for improving student achievement--efficiency,…

  20. Interculturalidad y anglofonia en la ensenanza del ingles como lengua extranjera (Interculturalism and Anglophone Studies in the Teaching of English as a Foreign Language).

    ERIC Educational Resources Information Center

    Zoreda, Margaret Lee; Revilla, Teresa Flores

    This article, written in Spanish, proposes to incorporate the subject "Anglophonism" into the curriculum of English as a Foreign Language (EILE) with a view to providing universities with an intercultural division. It provides a brief summary of John Dewey's philosophy with regard to anthropology, politics, and education. It explains the term…

  1. "Mastery Learning" Como Metodo Psicoeducativo para Ninos con Problemas Especificos de Aprendizaje. ("Mastery Learning" as a Psychoeducational Method for Children with Specific Learning Problems.)

    ERIC Educational Resources Information Center

    Coya, Liliam de Barbosa; Perez-Coffie, Jorge

    1982-01-01

    "Mastery Learning" was compared with the "conventional" method of teaching reading skills to Puerto Rican children with specific learning disabilities. The "Mastery Learning" group showed significant gains in the cognitive and affective domains. Results suggested Mastery Learning is a more effective method of teaching reading skills to children…

  2. Uso de exámenes de detección como oportunidad para ayudar a fumadores a dejar el tabaco

    Cancer.gov

    El NCI ha publicado un anuncio de financiamiento para ayudar a estimular la investigación sobre métodos óptimos para dejar de fumar cigarrillos que se entreguen junto con los exámenes de detección.

  3. Effect of the pore size distribution on the activities of alumina supported Co-Mo catalysts in the hydrotreatment of boscan crude

    SciTech Connect

    Plumail, J.C.; Jacquin, Y.; Martino, G.; Toulhoat, H.

    1983-03-01

    The effects of pore size and distribution on the activity of Co-Mo/Al/sub 2/O/sub 3/ catalysts in the hydrotreatment of asphaltenes have been studied using testing methodology designed to provide initial activities for the catalysis of the critical reactions in the process, hydrodesulfurization (HDS), hydrodemineralization (HDM) (V,NI) and asphaltene conversion to resins and oils (HDA) suitable for subsequent use as refining feedstocks. Nine monomodal (micropores) and seven bimodal (micro- and macropores) were tested. Maximum HDS occurs with mono- and bimodal catalysts having an average pore diameter of 100 A/sup 0/. Maximum HDA and HDM activity appears at a pore diameter between 150 and 200 A/sup 0/ and increases with increasing macroporosity, macropores allowing more efficient access of the large asphaltene molecular units to active sites. Overall catalytic efficiency is dependent upon but HDS and asphaltene hydrogenation rates. Variation of pore structures allowed reaction selectivities to be varied and provided control a asphaltene product (resins, oils) composition.

  4. Collaborative Work as an Alternative for Writing Research Articles (El trabajo colaborativo como alternativa para la escritura de artículos investigativos)

    ERIC Educational Resources Information Center

    Carvajal Medina, Nancy Emilce; Roberto Flórez, Eliana Edith

    2014-01-01

    Academic writing in English in our context is a significant aspect that can be innovative when a convergence model of writing stages is used along with collaborative work. This article reports on a study aimed at analyzing how collaborative work relates to undergraduate electronics students' academic writing development in English as a foreign…

  5. Metodo de Archivar las Observaciones del Comportamiento del Nino, Como Guia para Entenderlo Mejor (Methods of Recording Observations of Children's Behavior, A Guide for Better Understanding)

    ERIC Educational Resources Information Center

    Stamp, Isla M.

    1971-01-01

    Copies of the Behaviour Study Technique described in this article may be obtained in English from the Australian Council for Educational Research, Frederick St., Hawthorn, Victoria, Australia 3122. (RY)

  6. Un currículo interdisciplinario de base teórica para enseñar inglés como segunda lengua1

    PubMed Central

    Fuentes, Brenda O.; Mas, Francisco Soto; Mein, Erika; Jacobson, Holly E.

    2013-01-01

    Among Hispanic immigrants in the United States (US), learning English is considered necessary for economic and social achievement. As a consequence, there is a high demand for English as a Second Language (ESL) classes. Despite the recognized benefits of ESL programs, both at the individual and social levels, more research is needed to identify education strategies that effectively promote all aspects of learning English as a second language. This article describes an ESL curriculum that incorporates a theory-based pedagogical approach specifically designed for immigrant Hispanic adults on the US-Mexico border region. The article also describes the implementation of the curriculum as well as the results of the evaluation, which was conducted using both quantitative and qualitative methods. Quantitative results indicate that the participants significantly improved their English proficiency (L2). Qualitative results suggest that participants were positively impacted by both the content and pedagogical approaches used by the curriculum. Their experience with the ESL class was positive in general. It can be concluded that the curriculum achieved its objective. This approach could serve as a model for second language teaching for adults. PMID:25284915

  7. The Accented EFL Teacher: Classroom Implications (El acento del profesor de inglés como lengua extranjera: implicaciones pedagógicas)

    ERIC Educational Resources Information Center

    Arboleda Arboleda, Argemiro; Castro Garcés, Ángela Yicely

    2012-01-01

    This article reports the findings of a research study on how significant having a foreign accent is for non-native English as a foreign language teachers and learners at university level. It points out the perceptions that teachers and students have about the most relevant issues in the teaching and learning processes. Data were collected by means…

  8. La efectividad de la educacion a distancia como metodologia en la desarrollo de destrezas de pensamiento (Effectiveness of Distance Education as a Methodology for Developing Thinking Skills).

    ERIC Educational Resources Information Center

    Melendez Alicea, Juan

    1992-01-01

    Presents steps taken in designing, justifying, and implementing an experimental study designed to investigate the effectiveness of distance education as a methodology for developing thinking skills. A discussion reviews major findings of the study by comparing student experiences from multimedia distance education and student experiences from…

  9. Como Lo Hago Yo: Anomalías del Tubo Neural en Guatemala — Mielomeningocele Unidad de Espina Bífida e Hidrocefalia

    PubMed Central

    Manucci, Graciela; von Quednow, Enzo

    2014-01-01

    En Guatemala nacen por añ 786 niños con defectos de tubo neural. Operamos 65 a 70 niños con mielomenigocele por año. Tenemos equipo multidisciplinario. Recomendamos parto por cesárea. Infección antes de la cirugía es un problema mayor. Derivación tardía es un problema. Disecamos la plaqueta con la técnica clásica. Suturamos la plaqueta para restituir la forma de la médula. Corpectomía en casos de cifósis. Hidrocefalía: Operamos el 80% de los niños. Chiari II: Operamos basados en los síntomas, primero nos aseguramos que la válvula funciona bien. Médula anclada: Operamos basados en los síntomas. PMID:24791216

  10. La Imagen Publica y Professional del Espanol en Yanquilandia - y Como Mejorarla (The Public and Professional Image of Spanish in "Yankee-Land" and How to Improve It).

    ERIC Educational Resources Information Center

    Mead, Robert G., Jr.

    1981-01-01

    Decries the stereotypes and prejudices that affect U. S. relations with the Hispanic world and with its own Hispanic minorities. Points out that these attitudes also affect the study of Spanish as a foreign language and suggests means by which educators can improve the Hispanic image among Anglo Americans. (MES)

  11. El Reto: A Leer America! A Leer Y Escribir Ya! Como Divertirse Leyendo Y Escribiendo. (America Reads Challenge: Read*Write*Now! Activities for Reading and Writing Fun)

    ERIC Educational Resources Information Center

    Kameenui, Edward J.; Simmons, Deborah C.

    Developed by national reading experts for the "America Reads Challenge: Read*Write*Now!" initiative and translated into Spanish, this booklet provides 45 ideas for families, teachers, librarians, and other learning partners to use with all children--including those with disabilities--to help them read well and independently by the end of third…

  12. Como Puede Mejorar el Programa de Educacion Migrante con el Poder e Influencia de los Padres. Parent Power in the Migrant Education Program: How to Make a Difference.

    ERIC Educational Resources Information Center

    National Council of La Raza, Washington, DC.

    The bilingual (English-Spanish) handbook explains the established rights that parents with children enrolled in the Elementary and Secondary Education Act Title I Migrant Education Program have and presents ways in which parents can use these rights to help ensure that their children receive a quality education. Chapters discuss: (1) content of…

  13. "O Ensaio como Forma" ou Um Ensaio acerca da Teoria Critica da Sociedade ("The Essay as Form" or An Essay about the Critical Theory of Society).

    ERIC Educational Resources Information Center

    Giordano, Rosely

    2000-01-01

    Illuminates the critical theory project, with themes permeating the theoretical constructions of Frankfurt (Germany). Debates the predominance of positivism in the production of knowledge. Speculates that "the essay as form" constitutes itself as a representation of the concept of the Enlightenment. Concludes with a dialogue between Theodor Adorno…

  14. Me escuchas? Como conversar con ninos de cuatro a doce anos (Are You Listening to Me? Communicating with Children from Four to Twelve Years Old).

    ERIC Educational Resources Information Center

    Delfos, Martine F.

    Although talking to children is a daily activity for almost everyone at some stage in one's life and an essential activity for professionals who work with children, there is little research on activity. This Spanish-language book describes communication with children between the ages of 4 and 12 years, focusing on open question-and-answer sessions…

  15. Building Your Baby's Brain: A Parent's Guide to the First Five Years = Como estimular el cerebro infantil: Una guia para padres de familia.

    ERIC Educational Resources Information Center

    Dodge, Diane Trister; Heroman, Cate

    Noting that all parents can help their baby's brain to grow, this guide, in English- and Spanish-language versions, explores what science has learned about infant brain development and how parents and caregivers can influence cognitive development. Topics covered include: prenatal care, touching your baby, teaching about feelings and self-control,…

  16. Communicacion Expresiva: Como los ninos nos envian mensajes [and] Comunicacion Receptiva: Como los ninos entienden nuestros mensajes [and] Interacciones de Comunicacion: Hacen falta dos. Hojas informativa de DB-LINK (Communication Interactions: It Takes Two [and] Receptive Communication: How Children Understand Your Messages to Them [and] Expressive Communication: How Children Send Their Messages to You. DB-LINK Fact Sheets).

    ERIC Educational Resources Information Center

    Stremel, Kathleen

    This document consists of three separately published fact sheets combined here because of the close relationship of their subject matter. The first fact sheet, "Communication Interactions: It Takes Two" (Kathleen Stremel), defines communication; suggests ways to find opportunities for interactive communication; offers specific suggestions for…

  17. [Age and the course of nephrotoxic nephritis in rats].

    PubMed

    Samoĭlova, Z T; Kliukina, S S

    1978-12-01

    In experiments on two groups of mongrel rats (4 weeks old and 4 months old) with induced nephrotoxic nephritis it was revealed that in comparison with adult rats the course of nephritis in ratlings was characterized by lesser proteinuria, selective in nature, by lesser reducticn of endogenous creatinine clearance and diuresis. The acido- and ammo-niogenesis decreased in ratlings and adult rats to the same extent. Morphological changes in the kidneys of ratlings were less pronounced than in adult animals, and were mostly localized in the convoluted tubules. The level of DNA-synthetic activity of the epithelial nuclei of the glomeruli prevailed over this index of the convoluted tubules epithelium. The weight index of the kidneys increased less in ratlings with nephritis than in adult rats. beta-lipoproteinemia in ratlings increased 8 times. Normalization of the urine and blood indices occurred more rapidly in ratlings than in adult rats. PMID:31956

  18. Tuberculose pulmonaire révélée par un purpura thrombopénique chez l'enfant-à propos d'un cas clinique observé au service de pédiatrie des Cliniques Universitaires de Lubumbashi

    PubMed Central

    Lubala, Toni Kasole; Mutombo, Augustin Mulangu; Munkana, Arthur Ndundula; Manika, Michel Muteya

    2012-01-01

    Nous rapportons le cas d'un enfant de 7 ans, de sexe masculin ayant présenté un purpura thrombopénique avec épistaxis, hématémèse, otorragies et pétéchies généralisées. Durant la même hospitalisation, nous avons mis en évidence une tuberculose pulmonaire documentée par la présence de bacilles acido-alcoolo résistants à l'examen des crachats. Nous avons observé une majoration du taux de plaquettes en une semaine de corticothérapie intraveineuse à haute dose, avant l'instauration d'une poly chimiothérapie antituberculeuse. Nous rappelons également la controverse que suscite la prise en charge de cette association rarement rapportée. PMID:23077696

  19. Como ayudar a su hijo durante la edad preescolar, con actividades para los ninos desde el nacimiento hasta los 5 anos (Helping Your Preschool Child, with Activities for Children from Infancy through Age 5).

    ERIC Educational Resources Information Center

    Department of Education, Washington, DC. Office of Intergovernmental and Interagency Affairs.

    The first 5 yeas of a child's life are a time of tremendous physical, emotional, social, and cognitive growth. Noting that research shows that children are more likely to succeed in learning when their families actively support them, this Spanish-language booklet is intended for families and caregivers who want to help their preschool children…

  20. The Kindergarten Survival Handbook: The Before School Checklist & a Guide for Parents. (El Manual de Como Sobrevivir El Jardin de Ninos: La Lista Pre-escolar y Una Guia Para Los Padres).

    ERIC Educational Resources Information Center

    Elovson, Allana Cummings

    Written to help parents understand what their children need to know before they start kindergarten, this volume, bound separately in English and Spanish, is intended to help parents become their children's best, as well as their first and most important, teachers. The first part of the book, the before school checklist, is divided into eight…

  1. EFL Students' Perceptions about a Web-Based English Reading Comprehension Course (Percepciones de estudiantes de inglés como lengua extranjera acerca de un curso de comprensión lectora apoyado en la red)

    ERIC Educational Resources Information Center

    Gómez Flórez, Érica; Pineda, Jorge Eduardo; Marín García, Natalia

    2012-01-01

    Web-based distance education is an innovative modality of instruction in Colombia. It is characterized by the separation of the teacher and learners, the use of technological tools and the students' autonomy development. This paper reports the findings of a case study that explores students' perceptions about an English reading…

  2. Como ayudar a su hijo a tener exito en la escuela, con actividades para ninos entre las edades de 5 a 11 anos (Helping Your Child Succeed in School, with Activities for Children Ages 5 through 11).

    ERIC Educational Resources Information Center

    Paulu, Nancy

    At the heart of the No Child Left Behind Act of 2001 is a promise to raise standards for all children and to help all children meet those standards. This Spanish-language booklet provides information that parents can use to help their child succeed in school. Following an introduction, the second section of the booklet, "The Basics," offers…

  3. Systemic Functional Linguistics and Discourse Analysis as Alternatives When Dealing with Texts (La lingüística sistémica funcional y el análisis del discurso como alternativas para trabajar con textos)

    ERIC Educational Resources Information Center

    García Montes, Paula Andrea; Sagre Barboza, Ana María; Lacharme Olascoaga, Alba Isabel

    2014-01-01

    This article presents a case study research with aims to find out which activities, methodological and textual aspects used in a reading strategies course were causing a group of students difficulties when analyzing critically written information. We conducted the study at Universidad de Córdoba (Colombia) with seventh semester students from the…

  4. What Makes a Good Teacher? Children Speak Their Minds=Qu'est-ce qu'un bon maitre? Les enfants ouvrent leur coeur=Como debe ser un buen maestro? Los ninos opinan.

    ERIC Educational Resources Information Center

    Khawajkie, Elizabeth, Ed.; And Others

    This booklet is a product of the UNESCO Associated Schools Project, a network of some 3,800 schools in 131 countries, which conducts pilot projects to promote education for peace, international understanding, and cooperation. Schools taking part in the project participated in an international contest asking for spontaneous reactions to the…

  5. Adult EFL Reading Selection: Influence on Literacy (Procesos de selección de lecturas en estudiantes adultos de inglés como lengua extranjera y su influencia en la habilidad lectora)

    ERIC Educational Resources Information Center

    Basallo Gómez, Juan Sebastián

    2016-01-01

    This paper is about the impact of systematic reading selection used to promote English as foreign language learning in adult students. A qualitative action research methodology was used to carry out this project. Ten class sessions were designed to provide students an opportunity to select texts according to criteria based upon their language…

  6. Teachers' Beliefs about Assessment in an EFL Context in Colombia (Creencias de los profesores acerca de la evaluación en un contexto de inglés como lengua extranjera en Colombia)

    ERIC Educational Resources Information Center

    Muñoz, Ana Patricia; Palacio, Marcela; Escobar, Liliana

    2012-01-01

    There is evidence that teachers' beliefs on teaching and learning exert an influence on the way they teach and assess learning, and on what students learn. Therefore, it is central that overt attention is devoted to the perceptions teachers have and how they influence teaching and learning. In this article we describe a study on…

  7. Como Promover el Exito de las Ninas y las Minorias en las Ciencias y en las Matematicas. Para Padres/sobre Padres (How To Promote the Science and Mathematics Achievement of Females and Minorities. For Parents/about Parents).

    ERIC Educational Resources Information Center

    Schwartz, Wendy

    Some minority and female students traditionally have not been given the help they need to enroll and succeed in mathematics and science classes. Now, however, various approaches are available to give these students the extra attention they need. Parents can help children develop an interest in science and mathematics by: (1) identifying role…

  8. Parents as Partners: Planning Early for Your Children's School Success and College Attendance. Revised Edition = Los Padres como Socios: Planificando para el Exito Escolar y la Asistencia al Colegio de Sus Ninos. Edicion Revisada.

    ERIC Educational Resources Information Center

    Reyes, Maria; Rothman, Donald

    This booklet, available in English and Spanish, describes what California parents can do at home and in the school to support and encourage their children's success in school and college. Discussion emphasizes the extent to which parents influence their children's attitudes about learning and school, and points out that parent involvement is…

  9. Parents as Partners: Planning Early for Your Children's School Success and College Attendance = Los Padres como Socios: Planificando para el Exito Escolar y la Asistencia al Colegio de Sus Ninos.

    ERIC Educational Resources Information Center

    California State Univ., Long Beach.

    Presented in both the English and Spanish Language versions is a booklet which describes what parents can do at home and in the school to support and encourage their children's success in school and college. Discussion emphasizes the extent to which parents influence their children's attitudes about learning and school, and points out that parent…

  10. Como ayudar a su hijo a ser un buen lector: Con actividades para los ninos desde el nacimiento hasta los 6 anos (Helping Your Child Become a Reader: With Activities for Children from Infancy through Age 6).

    ERIC Educational Resources Information Center

    Lehr, Fran; Osborn, Jean

    When parents and other family members read with their children, help them with homework, talk with their teachers, and participate in school or other learning activities, they give their children a tremendous advantage. The foundation for learning to read is in place long before children enter school and begin formal reading instruction. Families…

  11. Kathy Learns How Breastfeeding Can Be Used...To Space Pregnancies. Mother-to-Mother Support = Josefa Aprende como la Lactancia Puede Ser Usada...Para Espaciar los Embarazos. Apoyo Madre a Madre.

    ERIC Educational Resources Information Center

    Magalhaes, Rebecca; Stone-Jimenez, Maryanne; Allen de Smith, Paulina; Smith, Natalia

    These magazine-sized booklets, one in English, one in Spanish, are in cartoon format and designed to be used by people with limited literacy in English or Spanish. They explain how breastfeeding can be used to help space pregnancies, the limitations of its effectiveness as a pregnancy-avoiding method, and that the spacing of pregnancies can be…

  12. A Comparison of Chinese and Colombian University EFL Students Regarding Learner Autonomy (Comparación entre estudiantes universitarios de inglés chinos y colombianos con respecto a su autonomía como aprendices)

    ERIC Educational Resources Information Center

    Buendía Arias, Ximena Paola

    2015-01-01

    This research seeks to gain deeper understanding of learner autonomy in English as a Foreign Language students from different cultures through the identification and analysis of similarities and differences between Chinese and Colombian students from two public universities: Tianjin Foreign Studies University in China and Universidad Surcolombiana…

  13. La lectura literaria como arte de "performance": la teoria transaccional de Louise Rosenblatt y sus implicaciones pedagogicas (The Use of Literature as Performance Art: The Transactional Theory of Louise Rosenblatt and Its Pedagogical Implications).

    ERIC Educational Resources Information Center

    Zoreda, Margaret Lee

    This paper focuses on the work that Louise Rosenblatt and her followers in the United States have done to improve the teaching and learning of literature at all educational levels. Although these researchers have focused almost exclusively on the use of literature in the native language, the paper uses transactional theory as a basis for teaching…

  14. Estudio del proceso de ebullicion en el interior de un tubo multipuerto extruido en aluminio con mini-canales de geometria triangular usando R32 y R134a como fluidos de trabajo

    NASA Astrophysics Data System (ADS)

    Ramirez Rivera, Francisco Alberto

    The use of multiport mini-channel tubes in compact exchangers has increased in the last few years. They contributing to improve thermal efficient, compactness, energy conservation and required lower refrigerants charge by which reduction of greenhouse gases emission. Those mentioned advantages are very important aspects with regard to modern refrigeration systems design. For that reason, several experimental investigation have been carried out in order to characterize the flow boiling heat transfer process and frictional pressure drop in tubes with parallel channels. Since, the ability to estimate pressure drop and heat transfer coefficient for specific conditions is a fundamental issue to optimise the design of compact heat exchanger. In this study, the characteristics of two- phase flow pressure drop and convective boiling heat transfer have been investigated experimentally inside multiport mini-channel aluminium tube with triangular geometry, hydraulic diameter 0.715 mm and heating length of 1205 mm using R32 and R134a as working fluids. A wide experimental campaign has been carried out to complete an array of measurement under different conditions for both refrigerants studied. The experimental conditions examined included: mass velocity 275-1230 kgm -2s-1, heat flux 0.75-9.30 kWm-2, saturation temperature, 5°C, 7.5°C, 12.5°C, vapour quality 0.012-0.51. The database presented consists of 312 averages values, 223 averages values were recorded for R134a and 89 for R32. The flow boiling averages values were calculated selecting a sample of 40 readings (steps 20s) in stable conditions for all measured variables at each mass velocity tested.

  15. Coping with Social Change: Programs That Work. Proceedings of a Conference (Acapulco, Mexico, June 1989) = Como enfrentarse al cambio social: programas eficaces. Actas de uno Conferencia (Acapulco, Mexico, Junio de 1989).

    ERIC Educational Resources Information Center

    Hoskins, Irene, Ed.

    Written in English and Spanish, this document contains the proceedings of the 14th International Congress of Gerontology on concerns about the impact of rapid social change on the well-being of older women and families in Latin American and the Caribbean and about effective programs that address the needs of the older populations. The first…

  16. When Students Say Far Too Much: Examining Gushing in the ELT Classroom (Cuando los alumnos dicen demasiado: análisis del uso excesivo de palabras en clases de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Mugford, Gerrard; Cuevas, Oscar Ramírez

    2015-01-01

    English foreign-language users often overuse words when faced with difficult situations. Called gushing, such excessive use of words is often legitimately employed by native speakers to express, for instance, gratitude and apologies when a simple "thank you" or "sorry" does not sufficiently convey an interlocutor's feelings.…

  17. Exploring Elementary Students' Power and Solidarity Relations in an EFL Classroom (Exploración de las relaciones de poder y solidaridad entre estudiantes de primaria en la clase de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Méndez, Tatiana; García, Andrea

    2012-01-01

    This article derives from a critical discourse analysis study that reports the characteristics of elementary school students' power and solidarity relations in English as a foreign language classroom in Bogotá, Colombia, while we were doing our teaching English as a foreign language practicum. The study was based on theories of power and…

  18. A Guide for Reading: How Parents Can Help Their Children Be Ready To Read and Ready To Learn = Guia Para Leer: Como los padres pueden preparar a sus hijos a leer y aprender desde la infancia.

    ERIC Educational Resources Information Center

    White House Initiative on Educational Excellence for Hispanic Americans, Washington, DC.

    As part of the White House Initiative on Educational Excellence for Hispanic Americans, this brochure (in English and Spanish) provides a guide to assist parents in helping their children become ready to read and to learn. The suggestions include: (1) talking to infants/toddlers to help them learn to speak and understand the meaning of words; (2)…

  19. “Es como uno bomba de tiempo [It’s like a time bomb]”: A Qualitative Analysis of Perceptions of Diabetes Among First-Degree Relatives of Latino Patients With Diabetes

    PubMed Central

    Boutin-Foster, Carla; Milan, Maria; Kanna, Balavenkatesh

    2014-01-01

    Abstract Background. The South Bronx, a largely Latino community, has become an epicenter of the diabetes epidemic in New York City. In this community, nondiabetic first-degree relatives of people with diabetes are prime targets for intervention. Therefore, the objective of this study was to explore the knowledge of diabetes and attitudes toward health behavior modification of Latino adults who are first-degree relatives of people with diabetes. Methods. Participants were recruited from three settings in the South Bronx (a community-based organization, a faith-based organization, and a taxi station). The Common Sense Model was used to develop focus-group items. This model provides a framework for exploring illness representations along five domains: identity, cause, consequences, timeline, and perceptions of curability. Responses were transcribed verbatim, and data analysis proceeded in the following order: data immersion, assignment of codes, grouping of key concepts to form categories, and construction of higher-order themes. Results. Of the 115 potential participants identified, 53 were found to be eligible, and 23 of these participated in the focus group. Of these, 20 were Dominicans, 2 were Puerto Ricans, and 1 was Salvadorian. The mean age was 46.39 years, 35% were women, 61% were married, and 26% had less than a high school education. Qualitative analyses resulted in 547 codes that were grouped into 52 concepts, from which 9 categories and 4 overarching themes emerged. The dominant themes were 1) family, genetics, and culture play a major role in the etiology of diabetes; 2) being Latino and having a first-degree relative with diabetes makes getting diabetes inevitable, and, like a time bomb exploding, it is destined to happen; 3) once one develops diabetes, the physical and emotional consequences are devastating and destructive; and 4) diabetes can be “cured” through healthy eating and with insulin. Conclusions.In this study, first-degree relatives of patients with diabetes were knowledgeable about the risks and consequences of diabetes. However, some participants felt that being Latino and having a first-degree relative with diabetes made one destined to have diabetes. Addressing this misperception through culturally tailored interventions has implications for diabetes prevention and may help to stem the diabetes epidemic in Latino communities. PMID:26246756

  20. Como ayudar a su hijo durante los primeros anos de la adolescencia: Para los padres con ninos entre las edades de 10 a 14 anos (Helping Your Child through Early Adolescence: For Parents of Children from 10 through 14).

    ERIC Educational Resources Information Center

    Paulu, Nancy

    Recognizing that parents and families can greatly influence the development of their 10- through 14-year-olds, this Spanish-language booklet is part of a national effort to provide parents with the latest research and practical information to help them support their children both at home and in school. The booklet is organized in 13 sections…

  1. Moral Responsibility and Confidence as Factors That Influence Teacher Involvement in Educational Change (Responsabilidad moral y confianza como factores que influyen en la participación del profesor en el cambio educativo)

    ERIC Educational Resources Information Center

    López, Cecilio

    2010-01-01

    Various factors that are not easily observed have a strong impact on educational change. In this paper, I examine some of the issues that emerged from the data collected while exploring my informants' perceptions and attitudes towards their changing roles when confronted with curriculum innovation. This research demonstrates that the…

  2. Estudo da utilizacao da biomassa florestal como fonte de produtos quimicos e energia atraves de processos quimicos e biotechnologicos (Utilization of forest biomass for chemicals and energy by chemical and biotechnological processes). Master's thesis

    SciTech Connect

    de Miranda, I.M.S.S.

    1989-04-01

    The chemical composition and the non-structural carbohydrate composition were determined for 1-year-old Eucalyptus globulus Labill trees, grown in an experimental plantation with different nutrient and water supplies (C-trees, where no treatment was made and IL-trees, which received a nutrient supply and irrigation). Leaf carbohydrates were determined for the same conditions. Pulping experiments were made using kraft cooks of eucalyptus wood. The results of the pretreatments are complemented with scanning electron microscopy observations. Average wood composition was: ash 1.6%, total extractives 5.2%, Klason lignin 21.0%, soluble lignin 3.1% (% of o.d. weight). The results did not show statistical significant differences between the two growth conditions. The average wood carbohydrate composition was: glucose 2.7%, frutose 4.1% sucrose 1.3% and starch 0.5%. The average carbohydrate composition of leaves was: glucose 1.0%, frutose 1.7%, sucrose 0.1% and starch 4.1%. The average yield for the kraft wood delinification was 49%. The saccharification of pretreated eucalyptus chips with a steam-explosion pretreatment was: For H2SO4 impregnation 26.6% and for H2O impregnation 44.2%.

  3. Ideologies Revealed during the Construction of Meaning in an EFL Class (Ideologías reveladas durante la construcción de significado en una clase de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Fajardo Mora, Néstor Ricardo

    2014-01-01

    This article reports on an interpretive qualitative study conducted at a public university in Bogotá with 26 pre-service social studies teachers. It is focused on unveiling which ideologies are discovered when they construct the meaning of texts through text-based tasks in an English as a foreign language class. The data were collected by using…

  4. The Impact of Different Types of Journaling Techniques on EFL Learners' Self-Efficacy (El impacto de diferentes tipos de diario en la autosuficiencia de estudiantes de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Baleghizadeh, Sasan; Mortazavi, Mahboobeh

    2014-01-01

    This article reports on an investigation of the impact of different methods of journaling on self-efficacy of learners of English as a foreign language. Sixty upper-intermediate Iranian English language learners were randomly assigned to three experimental conditions, namely no-feedback, teacher-feedback, and peer-feedback, and one control…

  5. The Portrayal of EFLTeachers in Official Discourse: The Perpetuation of Disdain (La imagen de los profesores de inglés como lengua extranjera en el discurso oficial: la perpetuación del desdén)

    ERIC Educational Resources Information Center

    Guerrero, Carmen Helena

    2010-01-01

    The purpose of this article is to offer an interpretation of the images of Colombian English teachers constructed in official discourse, particularly (but not exclusively) in the document "Estándares básicos de competencias en lenguas extranjeras: inglés. Formar en lenguas extranjeras, el reto". This is part of a larger critical…

  6. The Preschool Classroom as a Context for Cognitive Development: Type of Teacher Feedback and Children's Metacognitive Control (El aula Preescolar como espacio de desarrollo cognitivo: tipo de feedback docente y control metacognitivo en los niños)

    ERIC Educational Resources Information Center

    Muñoz, Liz; Cruz, Josefina Santa

    2016-01-01

    Introduction: The aim of this work was to determine whether the type of feedback given by the preschool teacher during class impacts the children's metacognitive control. For this purpose, the children's behavior was analyzed while teachers provided feedback during collaborative learning sessions. Method: A quasi-experimental, cross-sectional…

  7. La Migracion Como Una Transicion Critica para la Persona en Su Ambiente. Una Interpretacion Organismico Evolutiva. (Migration as a Critical Person-in-Environment Transition: An Organismic-Developmental Interpretation.)

    ERIC Educational Resources Information Center

    Pacheco, Angel M.; And Others

    In order to explore some of the changes and stresses connected with migration and return migration, a study was conducted among migrants returning from the United States mainland to Puerto Rico. The sample consisted of 75 adolescents participating in a Bilingual Education program in Puerto Rico. Data were collected using Psychological Distance…

  8. Exploring Authorship Development among Mexican EFL Teacher-Researchers (Exploración sobre el desarrollo de la autoría en los profesores-investigadores de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Trujeque Moreno, Eva Estefania; Encinas Prudencio, Fátima; Thomas-Ruzic, Maria

    2015-01-01

    This article presents a multi-theoretical model to address processes of "authorship development" in the English as a foreign language teaching profession. Working within a sociocultural perspective of second-language teacher education, the authors examined six experienced nonnative English-speaking teacher-researchers. Perceptions of…

  9. Developing Academic Literacy and Voice: Challenges Faced by a Mature ESL Student and Her Instructors (Desarrollo del discurso académico y la voz: retos de una estudiante de inglés como segunda lengua y sus profesores)

    ERIC Educational Resources Information Center

    Correa, Doris

    2010-01-01

    Drawing on critical, socio-cultural and sociolinguistic theories of writing, text and voice, this ethnographic study examines the challenges that a mature ESL student and her instructors in a university course on Spanish Language Media face as they co-construct a common understanding of academic literacy and voice in an undergraduate General…

  10. Learning & Growing Together: Understanding and Supporting Your Child's Development = Aprender y crecer juntos: Como comprender y fomentar el desarrollo de sus hijos [with] Tip Sheets: Ideas for Professionals in Programs That Serve Young Children and Their Families.

    ERIC Educational Resources Information Center

    Lerner, Claire; Dombro, Amy Laura; Powers, Stefanie

    Based on the view that the primary caregivers for infants and toddlers are their own best resource for understanding and caring for their child and that parenting is a lifelong learning process, this book provides information and tools to help caregivers build a strong foundation for their child's development. The book, both in English and…

  11. Introversion/Extroversion & Teachers' Perception on Dominican EFL College Students' Performance = La Introversion/Extroversion vs. La Percepcion Profesoral en el Desempeno de Estudiantes Universitarios Dominicanos de Ingles como Lengua Extranjera

    ERIC Educational Resources Information Center

    Tavarez Da Costa, Pedro

    2012-01-01

    This article discusses the relationship between introversion/extroversion and a student's performance (academic achievement) as perceived by Teachers of English as a Foreign Language in three regional centers of the Universidad Autonoma de Santo Domingo. There have been a great number of international studies already published to try to explain…

  12. EFL Teaching Methodological Practices in Cali (Prácticas metodológicas en la enseñanza de inglés como lengua extranjera en la ciudad de Cali)

    ERIC Educational Resources Information Center

    Chaves, Orlando; Hernández, Fanny

    2013-01-01

    In this article we aim at showing partial results of a study about the profiles of English as a Foreign Language (EFL) teachers in both public and private primary and secondary strata 1-4 schools in Cali, Colombia. Teachers' methodological approaches and practices are described and analyzed from a sample of 220 teachers. Information was gathered…

  13. La Capacitacion de Docentes Como Prioridad de los Sistemas Educativos de America Latino y al Caribe (In-Service Teacher Training as a Priority of Latin American and Caribbean Educational Systems).

    ERIC Educational Resources Information Center

    Valle, Victor M.

    Whenever top-level officials in Latin American and Caribbean educational systems are approached, the topic of inservice teacher training is presented as a major priority. This paper outlines some ideas about the subject of inservice teacher training as a priority of educational systems in Latin American and Caribbean countries. The most frequent…

  14. Encuentros esteticos deweyanos con la cultura popular anglofona en la ensenanza de ingles como lengua extranjera (EILE). Working Paper (Deweyan Aesthetic Encounters with Anglophone Popular Culture in the Teaching of English as a Foreign Language. Working Paper).

    ERIC Educational Resources Information Center

    Zoreda, Margaret Lee

    This paper discusses how the introduction of Anglophone popular culture in the English-as-a-foreign-language class can serve to foster critical aesthetic experiences. It is argued that the popular culture of the hegemonic Anglophone countries is already part of students' lives and for that reason should be included in any critical Anglophone…

  15. Un estudio de evaluacion educativa manipulativos en el aprendizaje de las matematicas con estudiantes hispanos adquiriendo ingles academico como segunda lengua (A Study of the Use of Manipulatives in the Assessment of Mathematics Instruction with ESL Hispanic Students).

    ERIC Educational Resources Information Center

    Lara-Alecio, Rafael; Parker, Richard; Aviles, Claudia; Mason, Samantha; Irby, Beverly J.

    1998-01-01

    As an alternative form of mathematics assessment for use with limited-English-proficient students, 14 mathematics tasks using manipulatives were administered to 45 Hispanic students in grades 1-3 and readministered 2-3 weeks later. Test reliability and validity, task difficulty, and the relationship among test subscales across grades were…

  16. The Impact of Conferencing Assessment on EFL Students' Grammar Learning (Impacto de la evaluación mediante conferencias en el aprendizaje de la gramática en estudiantes de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Baleghizadeh, Sasan; Zarghami, Zahra

    2012-01-01

    This article reports on a study that was carried out in order to examine the impact of conferencing assessment on students' learning of English grammar. Forty-two Iranian intermediate university students were randomly assigned to an experimental and a control group. The participants in the experimental group took part in four individual and…

  17. The Role of Genre-Based Activities in the Writing of Argumentative Essays in EFL (El papel de actividades basadas en géneros en la escritura de ensayos argumentativos en inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Chala Bejarano, Pedro Antonio; Chapetón, Claudia Marcela

    2013-01-01

    This article presents the findings of an action research project conducted with a group of pre-service teachers of a program in modern languages at a Colombian university. The study intended to go beyond an emphasis on linguistic and textual features in English as a foreign language argumentative essays by using a set of genre-based activities and…

  18. Como Trabajar y Vivir en la Realidad: Pasos Basicos Para Jovenes con Incapacidades, sus Padres y sus Profesores (How to Work and Live in the Real World: Basic Steps for Youth with Handicaps and Their Parents and Teachers).

    ERIC Educational Resources Information Center

    Patton, Patricia L.; And Others

    This Spanish version of "How to Work and Live in the Real World: Basic Steps for Youth with Handicaps and Their Parents and Teachers" is for young people with handicaps who are getting ready to graduate from high school and begin working and living in the adult world. The booklet places a special focus on individuals with cultural differences. It…

  19. O Imperio como Argumento: Um Contraponto entre Joaquim Nabuco e o Bispo D. Jose Mauricio da Rocha (The Empire as Argument: A Counterpoint between Joaquim Nabuco and the Bishop Dom Jose Mauricio da Rocha).

    ERIC Educational Resources Information Center

    Marson, Izabel Andrade

    1998-01-01

    Dialogs with the previous article establishing a comparative analysis between the political acceptance present in the reactionary speech of Dom Jose Mauricio da Rocha and in the monarchist words of Joaquim Nabuco. (PA)

  20. Los padres como maestros de los ninos. Los padres como recursos para los maestros. Serie E: El logro de la participacion de los padres, cuadernos I y II. Edicion para el estudiante. Cuadernos para el entrenamiento de maestros de educacion bilingue. (Parents as the Children's Teachers. Parents as Resources for the Teachers. Series E: Success with Parent Participation, Books I and II. Student Edition. Bilingual Education Teacher Training Packets.)

    ERIC Educational Resources Information Center

    Lazos, Hector

    The student versions of two learning modules for teacher training in bilingual education are part of a series focusing on promoting parent participation in the school system. An introductory section discussing the overall objectives of the materials is followed by two modules, each consisting of introductory sections and two units containing…

  1. Los padres como maestros de los ninos. Los padres como recursos para los maestros. Serie E: [E1] logro de la participacion de los padres. cuadernos 1 y 2. Edicion para el maestro. Cuadernos para el entrenamiento de maestros de educacion bilingue. (Parents as Their Children's Teachers. Parents as Resources for Teachers. Series E: Parent Participation, Book 1 and 2. Teacher Edition. Bilingual Education Teacher Training Packets).

    ERIC Educational Resources Information Center

    Lazos, Hector, Comp.

    This guide on training bilingual education teachers focuses on parent participation in school activities. The guide addresses three groups of people: paraprofessionals and non-graduate students, bilingual teachers, and graduate students. Two units are presented, one dealing with the important influence parents have on their child's language…

  2. Adsorption mechanism of acids and bases in reversed-phase liquid chromatography in weak buffered mobile phases designed for liquid chromatography/mass spectrometry

    SciTech Connect

    Gritti, Fabrice; Guiochon, Georges A

    2009-01-01

    The overloaded band profiles of five acido-basic compounds were measured, using weakly buffered mobile phases. Low buffer concentrations were selected to provide a better understanding of the band profiles recorded in LC/MS analyses, which are often carried out at low buffer concentrations. In this work, 10 {micro}L samples of a 50 mM probe solution were injected into C{sub 18}-bonded columns using a series of five buffered mobile phases at {sub W}{sup S}pH between 2 and 12. The retention times and the shapes of the bands were analyzed based on thermodynamic arguments. A new adsorption model that takes into account the simultaneous adsorption of the acidic and the basic species onto the endcapped adsorbent, predicts accurately the complex experimental profiles recorded. The adsorption mechanism of acido-basic compounds onto RPLC phases seems to be consistent with the following microscopic model. No matter whether the acid or the base is the neutral or the basic species, the neutral species adsorbs onto a large number of weak adsorption sites (their saturation capacity is several tens g/L and their equilibrium constant of the order of 0.1 L/g). In contrast, the ionic species adsorbs strongly onto fewer active sites (their saturation capacity is about 1 g/L and their equilibrium constant of the order of a few L/g). From a microscopic point of view and in agreement with the adsorption isotherm of the compound measured by frontal analysis (FA) and with the results of Monte-Carlo calculations performed by Schure et al., the first type of adsorption sites are most likely located in between C{sub 18}-bonded chains and the second type of adsorption sites are located deeper in contact with the silica surface. The injected concentration (50 mM) was too low to probe the weakest adsorption sites (saturation capacity of a few hundreds g/L with an equilibrium constant of one hundredth of L/g) that are located at the very interface between the C{sub 18}-bonded layer and the bulk

  3. Structures of nitrato-(2-hydroxybenzaldehydo) (2,2 Prime -bipyridyl)copper and nitrato-(2-hydroxy-5-nitrobenzaldehydo)(2,2 Prime -bipyridyl)copper

    SciTech Connect

    Chumakov, Yu. M.; Paladi, L. G.; Antosyak, B. Ya.; Simonov, Yu. A.; Tsapkov, V. I.; Bocelli, G.; Gulea, A. P.; Ginju, D.; Palomares-Sanchez, S. A.

    2011-03-15

    Nitrato-(2-hydroxy-5-nitrobenzaldehydo)(2,2 Prime -bipyridyl)copper (I) and nitrato-(2-hydroxybenzaldehydo)(2,2 Prime -bipyridyl)copper (II) were synthesized and characterized by X-ray diffraction. The coordination polyhedron of the central copper atom in complex I can be described as a distorted tetragonal pyramid whose base is formed by the phenol and carbonyl oxygen atoms of the monodeprotonated 2-hydroxy-5nitrobenzaldehyde molecule and the nitrogen atoms of the 2,2 Prime -bipyridyl ligand and whose apex is occupied by the oxygen atom of the nitrato group. In the crystal structure, complexes I are linked by the acido ligands and the NO{sub 2} groups of the aldehyde molecule into infinite chains. In complex II, the central copper atom is coordinated by 2-hydroxybenzaldehyde, 2,2 Prime -bipyridyl, and the nitrato group, resulting in the formation of centrosymmetric dimers. The coordination polyhedron of the central copper atom can be described as a bipyramid (4 + 1 + 1) with the same base as in complex I. The axial vertices of the bipyramid are occupied by the oxygen atom of the nitrato group and the bridging phenol oxygen atom of the adjacent complex related to the initial complex by a center of symmetry. In the crystal structure, complexes II are hydrogen bonded into infinite chains.

  4. An environmentally friendly method to remove and utilize the highly toxic strychnine in other products based on proton-transfer complexation

    NASA Astrophysics Data System (ADS)

    Adam, Abdel Majid A.; Refat, Moamen S.; Saad, Hosam A.; Hegab, Mohamed S.

    2015-12-01

    The study of toxic and carcinogenic substances represents one of the most demanding areas in human safety, due to their repercussions for public health. There is great motivation to remove and utilize these substances in other products instead of leaving them contaminate the environment. One potentially toxic compound for humans is strychnine (Sy). In the present study, we attempted to establish a quick, simple, direct and efficient method to remove and utilize discarded Sy in other products based on proton-transfer complexation. First, Sy was reacted with the acido organic acceptors PA, DNBA and CLA. Then, the resultant salts were direct carbonized into carbon materials. Also, this study provides an insight into the structure and morphology of the obtained products by a range of physicochemical techniques, such as UV-visible, IR, 1H NMR and 13C NMR spectroscopies; XRD; SEM; TEM; and elemental and thermal analyses. Interestingly, the complexation of Sy with the PA or DNBA acceptor leads to a porous carbon material, while its complexation with CLA acceptor forms non-porous carbon product.

  5. Development of a screening method for the analysis of organic pollutants in water using dual stir bar sorptive extraction-thermal desorption-gas chromatography-mass spectrometry.

    PubMed

    Tölgyessy, Peter; Vrana, Branislav; Krascsenits, Zoltán

    2011-12-15

    The development of a method for screening of organic compounds with a wide range of physico-chemical properties in water, based on dual stir bar sorptive extraction coupled with thermal desorption and gas chromatography-mass spectrometry (dual SBSE-TD-GC-MS) is described. The investigated water sample is divided into two aliquots and extracted with stir bar sorptive extraction at two different conditions: using addition of methanol or sodium chloride, respectively. Following extraction, the two stir bars are inserted into the same glass thermal desorption liner and are simultaneously desorbed and analysed by GC-MS. The method optimisation was performed using 45 environmentally harmful substances with different volatilities (boiling point from 193 to 495°C), polarity (logK(ow) from 2.17 to 8.54) and acido-basic properties. The majority of model compounds was selected from the EU list of priority substances in the field of water policy and from the US EPA method 625, respectively. Optimisation was performed for extraction parameters (sample volume, extraction time, stirring rate, addition of modifiers) as well as for the thermal desorption conditions (desorption flow, desorption time, cryofocusing temperature). Performance characteristics (recovery, repeatability, carryover, linearity, limits of detection and quantification) were determined for the optimised method. An example of analysis of a contaminated groundwater sample is presented. PMID:22099662

  6. Molluscicidal activity of various solvent extracts from Solanum nigrum var. villosum L. aerial parts against Galba truncatula

    PubMed Central

    Hammami, H.; Mezghani-Jarraya, R.; Damak, M.; Ayadi, A.

    2011-01-01

    Molluscicidal activity of Solanum nigrum var. villosum (morelle velue) extracts and their fractions were tested against the mollusca gastropoda Galba truncatula intermediate host of Fasciola hepatica. The results indicated that the hydro-methanol (MeOH-H2O) immature fruit extract possess the highest molluscicidal activity (LC50 = 3.96 mg/L) against Galba truncatula compared with other tested compounds. After acido-basic treatment, the methanolic extract fraction isolated from the immature fruits and the richest in alkaloids was the most toxic (LC50 = 1.65 mg/L). The fractions richest in saponosides obtained from the hydromethanolic and methanolic extracts of immature fruits showed interesting molluscicidal activities (LC50 = 6.15 mg/L and LC50 = 7.91 mg/L, respectively). The observed molluscicide activity could be attributed to the presence of alkaloids or saponosides. So, the immature fruits of Solanum nigrum var. villosum could be substrates of choice for molluscicide activity. In addition, total alkaloids and saponosides present in this plant deserve further investigations in order to identify the active principles and demonstrate their activities on mollusks in their natural habitat. According to the World Health Organization’s guidelines on screening for plant molluscicides, use of these fractions may add to the arsenal of methods to control snail transmitting fasciolosis in tropical and Third World countries where fasciolosis is a common disease. PMID:21395207

  7. Self-powered biosensor for ascorbic acid with a Prussian blue electrochromic display.

    PubMed

    Zloczewska, Adrianna; Celebanska, Anna; Szot, Katarzyna; Tomaszewska, Dorota; Opallo, Marcin; Jönsson-Niedziolka, Martin

    2014-04-15

    We report on the development of a nanocarbon based anode for sensing of ascorbic acid (AA). The oxidation of AA on this anode occurs at a quite low overpotential which enables the anode to be connected to a biocathode to form an ascorbic acid/O2 biofuel cell that functions as a self-powered biosensor. In conjunction with a Prussian blue electrochromic display the anode can also work as a truly self-powered sensor. The oxidation of ascorbic acid at the anode leads to a reduction of the Prussian blue in the display. The reduced form of Prussian blue, called Prussian white, is transparent. The rate of change from blue to colourless is dependent on the concentration of ascorbic acid. The display can easily be regenerated by connecting it to the biocathode which returns the Prussian blue to its oxidized form. In this way we have created the first self-powered electrochromic sensor that gives quantitative information about the analyte concentration. This is demonstrated by measuring the concentration of ascorbic acid in orange juice. The reported quantitative read-out electrochromic display can serve as a template for the creation of cheap, miniturizable sensors for other relevant analytes. PMID:24321882

  8. Assessment of carbonic anhydrase IX expression and extracellular pH in B-cell lymphoma cell line models

    PubMed Central

    Chen, Liu Qi; Howison, Christine M.; Spier, Catherine; Stopeck, Alison T.; Malm, Scott W.; Pagel, Mark D.; Baker, Amanda F.

    2015-01-01

    The expression of carbonic anhydrase (CA IX) and it’s relation to acidosis in lymphomas has not been widely studied. We investigated the protein expression of CA IX in a human B-cell lymphoma tissue microarray, and in Raji, Ramos, and Granta 519 lymphoma cell lines and tumor models, while also investigating the relation with hypoxia. An imaging method, acidoCEST MRI, was used to estimate lymphoma xenograft extracellular pH (pHe). Our results showed that clinical lymphoma tissues and cell line models in vitro and in vivo had moderate CA IX expression. Although in vitro studies showed that CA IX expression was induced by hypoxia, in vivo studies did not show this correlation. Untreated lymphoma xenograft tumor pHe had acidic fractions, and an Acidity Score was qualitatively correlated with CA IX expression. Therefore, CA IX is expressed in B-cell lymphomas and is qualitatively correlated with extracellular acidosis in xenograft tumor models. PMID:25130478

  9. Oxidative deamination by hydrogen peroxide in the presence of metals.

    PubMed

    Akagawa, Mitsugu; Suyama, Kyozo

    2002-01-01

    Various amines, including lysine residue of bovine serum albumin, were oxidatively deaminated to form the corresponding aldehydes by a H2O2/Cu2+ oxidation system at physiological pH and temperature. The resulting aldehydes were measured by high-performance liquid chromatography. We investigated the effects of metal ions, pH, inhibitors, and O2 on the oxidative deamination of benzylamine by H202. The formation of benzaldehyde was the greatest with Cu2+, and catalysis occurred with Co2+, VO2+, and Fe3+. The reaction was greatly accelerated as the pH value rose and was markedly inhibited by EDTA and catalase. Dimethyl sulfoxide and thiourea, which are hydroxyl radical scavengers, were also effective in inhibiting the generation of benzaldehyde, indicating that the reaction is a hydroxyl radical-mediated reaction. Superoxide dismutase greatly stimulated the reaction, probably due to the formation of hydroxyl radicals. O2 was not required in the oxidation, and instead slightly inhibited the reaction. We also examined several oxidation systems. Ascorbic acid/O2/Cu2+ and hemoglobin/H2O2 systems also converted benzylamine to benzaldehyde. The proposed mechanism of the oxidative deamination by H2O2/Cu2+ system is discussed. PMID:11999699

  10. Sulfoquinovose synthase – an important enzyme in the N-glycosylation pathway of Sulfolobus acidocaldarius

    PubMed Central

    Meyer, Benjamin H.; Zolghadr, Behnam; Peyfoon, Elham; Pabst, Martin; Panico, Maria; Morris, Howard R.; Haslam, Stuart M.; Messner, Paul; Schäffer, Christina; Dell, Anne; Albers, Sonja-Verena

    2015-01-01

    Summary Recently, the Surface (S)-layer glycoprotein of the thermoacidophilic crenarchaeote Sulfolobus acido-caldarius was found to be N-glycosylated with a heterogeneous family of glycans, with the largest having a composition Glc1Man2GlcNAc2 plus 6-sulfoquinovose. However, genetic analyses of genes involved in the N-glycosylation process in Crenarchaeota were missing so far. In this study we identify a gene cluster involved in the biosynthesis of sulfoquinovose and important for the assembly of the S-layer N-glycans. A successful markerless in-frame deletion of agl3 resulted in a decreased molecular mass of the S-layer glycoprotein SlaA and the flagellin FlaB, indicating a change in the N-glycan composition. Analyses with nanoLC ES-MS/MS confirmed the presence of only a reduced trisaccharide structure composed of Man1GlcNAc2, missing the sulfoquinovose, a mannose and glucose. Biochemical studies of the recombinant Agl3 confirmed the proposed function as a UDP-sulfoquinovose synthase. Furthermore, S. acidocaldarius cells lacking agl3 had a significantly lower growth rate at elevated salt concentrations compared with the background strain, underlining the importance of the N-glycosylation to maintain an intact and stable cell envelope, to enable the survival of S. acidocaldarius in its extreme environment. PMID:22059775

  11. The effect of pH on the synthesis of stable Cu2O/CuO nanoparticles by sol-gel method in a glycolic medium

    NASA Astrophysics Data System (ADS)

    Zayyoun, N.; Bahmad, L.; Laânab, L.; Jaber, B.

    2016-05-01

    In this work, we demonstrate that using a glycolic medium, both stable CuO and Cu2O nanoparticles can be elaborated from Cu colloidal particles by adjusting their chemical environment, in particular the acido-basicity of the solution. In this context, the effect of pH on the sol-gel synthesis of Cu2O/CuO NPs was investigated. XRD results confirmed the formation of pure Cu2O with a cubic structure at lower pH (pH ≤ 6), whereas the pure monoclinic CuO was formed at higher pH (pH ≥ 12). TEM image indicates that the as-formed CuO NPs in basic pH are spherical in shape and their average size is found to be in the range of 4.5 nm. However, the as-obtained Cu2O NPs in acid pH are cubical, with an average diameter of about 3 nm, and agglomerated into large spherical particles under the effect of ethylene glycol. Using the UV-Vis spectroscopy, the measured band gap energies of the prepared Cu2O and CuO NPs are 2.07 and 4.08 eV respectively. FTIR results confirm the purity of the synthesized CuO and Cu2O nanoparticles.

  12. Operation of the ISO-DALT system: Seventh edition

    SciTech Connect

    Tollaksen, S.L.; Anderson, N.L.; Anderson, N.G.

    1984-05-01

    The ISO-DALT system of two-dimensional electrophoresis was developed as a series of modifications of the original technique of O'Farrell. We have written a series of recipes and more detailed laboratory procedures that incorporate refinements and ''tricks of the trade'' as they have developed during our use of the system. The present collection is the seventh version in this series and represents the state of art as of May 1984. The seventh edition has been prepared to incorporate the changes that we have found helpful, as well as to add a few new sections such as silver staining, transfer gels, ACIDOs, and BASOs. Although these directions are specific for our laboratory, we hope that they will be helpful in other laboratories as well. Although some disagreement still exists, we recommend that gel patterns be oriented with acid isoelectric points (pIs) to the left and high sodium dodecyl sulfate (SDS) molecular weights at the top. This results in a system of pI and molecular weight values that run according to the Cartesian convention and facilitates the use of the charge and molecular weight standards described herein. 67 refs., 14 figs.

  13. Light-induced copper(II) coordination by a bicyclic tetraaza chelator through a ligand-to-metal charge-transfer reaction.

    PubMed

    Holm-Jørgensen, Jacob R; Jensen, Mikael; Bjerrum, Morten J

    2011-12-19

    To enable utilization of the broad potential of copper isotopes in nuclear medicine, rapid and robust chelation of the copper is required. Bowl adamanzanes (bicyclic tetraaza ligands) can form kinetically stable copper complexes, but they are usually formed at low rates unless high pH values and high temperatures are applied. We have investigated the effects of the variation in the pH, different anions, and UV irradiation on the chelation rate. UV spectra of mixtures of Cu(2+) and [2(4).3(1)]adz in water show the existence of a long-lived two-coordinated copper(II) intermediate (only counting coordinated amine groups) at pH above 6. These findings are supported by pH titrations of mixtures of Cu(2+) and [2(4).3(1)]adz in water. Irradiation of this complex in the ligand-to-metal charge-transfer (LMCT) band by a diode-array spectrophotometer leads to photodeprotonation and subsequently to formation of the four-coordinated copper(II) complex at a rate up to 7800-fold higher at 25 °C than in the dark. Anions in the solution were found to have three major effects: competitive inhibition due to Cu(II) binding anions, inhibition of the photoinduced transchelation from UV-absorbing anions, and photoredox inhibition from acido ligands capable of acting as electron donors in LMCT reactions. Dissolved O(2) was also found to result in photoredox inhibition. PMID:22074363

  14. Assessment of carbonic anhydrase IX expression and extracellular pH in B-cell lymphoma cell line models.

    PubMed

    Chen, Liu Qi; Howison, Christine M; Spier, Catherine; Stopeck, Alison T; Malm, Scott W; Pagel, Mark D; Baker, Amanda F

    2015-05-01

    The expression of carbonic anhydrase IX (CA IX) and its relationship to acidosis in lymphomas has not been widely studied. We investigated the protein expression of CA IX in a human B-cell lymphoma tissue microarray, and in Raji, Ramos and Granta 519 lymphoma cell lines and tumor models, while also investigating the relationship with hypoxia. An imaging method, acidoCEST magnetic resonance imaging (MRI), was used to estimate lymphoma xenograft extracellular pH (pHe). Our results showed that clinical lymphoma tissues and cell line models in vitro and in vivo had moderate CA IX expression. Although in vitro studies showed that CA IX expression was induced by hypoxia, in vivo studies did not show this correlation. Untreated lymphoma xenograft tumor pHe had acidic fractions, and an acidity score was qualitatively correlated with CA IX expression. Therefore, CA IX is expressed in B-cell lymphomas and is qualitatively correlated with extracellular acidosis in xenograft tumor models. PMID:25130478

  15. If Your Child Learns in Two Languages: A Parent's Guide for Improving Educational Opportunities for Children Acquiring English as a Second Language = Si su nino aprende en dos idiomes: Una guia para que las familias sepan como mejorar las oportunidades educativas de los ninos que adquieren el ingles como segunda lengua = Neu lon Ban Hoc Bang Hai Thu Tieng: Chi-nam cua phu-huynh de cai tien co hoi hoc van cua con em dang hoc Anh van nhu sinh ngu thu hai.

    ERIC Educational Resources Information Center

    Zelasko, Nancy; Antunez, Beth

    This guide, in English, Spanish, and Vietnamese, aims to inform parents of students who have learned or are learning English as a Second Language about appropriate approaches for educating children so that they can work with schools to ensure a high quality education for their children. The emphasis is on explaining the laws, schools, and research…

  16. Los padres como consejeros o coparticipes en la toma de decisiones. Serie E: El logro de la participacion de los padres, cuaderno III. Edicion para el estudiante. Cuadernos para el entrenamiento de maestros de educacion bilingue. (Parents as Advisors or Participants in Decision Making. Series E: Success with Parent Participation, Book III. Student Edition. Bilingual Education Teacher Training Packet).

    ERIC Educational Resources Information Center

    Rodriguez, Rodolfo, Comp.

    The student version of a learning module for teacher training in bilingual education is one of three focusing on promoting parent participation in the school system, and concentrates specifically on the role of parents as counselors and co-participants in decisionmaking. An introductory section discussing the overall objectives of the materials is…

  17. O Passado como Nacao: Imagens do Imperio nas Falas Reacionarias dos Anos 30 e 40 do Seculo XX: Uma Pequena Arqueologia do Debate Publico e Privado (The Past as Nation: Images of the Empire in the Reactionary Words of the 30s and 40s in the 20th Century: A Small Archaeology of the Public Debate versus the Private One).

    ERIC Educational Resources Information Center

    de Freitas, Marcos Cezar

    1998-01-01

    Suggests an archaeology of the public debate versus the private one in Brazil through analysis of the reactionary speech of a religious leader, Dom Jose Mauricio da Rocha, which produced innumerable representations of the Brazilian Empire. (PA)

  18. EFL Teachers' Perceptions of Continuing Professional Development: A Case of Iranian High School Teachers (La percepción de docentes de inglés como lengua extranjera acerca del desarrollo profesional continuado: el caso de profesores iraníes de bachillerato)

    ERIC Educational Resources Information Center

    Alibakhshi, Goudarz; Dehvari, Najibeh

    2015-01-01

    English, particularly regarding a foreign language teachers' professional development, has been studied in depth. However, it is not known how Iranian English as a foreign language teachers perceive continuing professional development. This study explored the perceptions of Iranian English as a foreign language teachers of continuing professional…

  19. ...And That's How It All Began: Putting Information about Your Child's Growth, Health and Safety All within Your Reach...Because the First Years Last Forever! = ...Y asi es como empezo todo: Ponemos a su alcance en forma conjunta la informacion sobre el crecimiento, la salud y la seguridad de su hijo...Porque los primeros anos duran para siempre!

    ERIC Educational Resources Information Center

    North Carolina Partnership for Children, Raleigh.

    Smart Start is North Carolina's model early childhood initiative to help all North Carolina children enter school healthy and prepared for success. This resource guide, in Spanish and English versions, is designed to provide parents with information on infant and child development, health care, and resources for further assistance. Presented in an…

  20. Using the EPOSTL for Dialogic Reflection in EFL Teacher Education (El Uso de EPOSTL para la Reflexión Dialógica en la Educación de los Docentes de Inglés como Lengua Extranjera)

    ERIC Educational Resources Information Center

    Schauber, Holli

    2015-01-01

    For many pre-service English as a Foreign Language (EFL) teachers and their mentors, the theory and practice driven European Portfolio for Student Teachers of Languages (EPOSTL) occupies a prominent and practical role in their preparation programs as a delivery system of core pedagogical skills and knowledge. Interest in the role that dialogical…

  1. How To Talk to Your Doctor (and Get Your Doctor To Talk to You!). An Educational Workshop on Doctor Patient Communication = Como Hablarle a su Doctor (iY que su doctor le hable a usted!). Un seminario educativo sobre la comunicacion entre el doctor y el paciente.

    ERIC Educational Resources Information Center

    Baylor Coll. of Medicine, Houston, TX.

    This workshop, written in both English and Spanish, focuses on improving communication between physician and patient. In the workshop, the trainers will talk about "building bridges" between patient and doctor by understanding the doctor's role and his/her duty to the patient. According to the workshop, a person's doctor should communicate…

  2. Teachers' Perceptions about Oral Corrective Feedback and Their Practice in EFL Classrooms (Percepciones de los docentes acerca de la retroalimentación correctiva y su práctica en las aulas de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Hernández Méndez, Edith; Reyes Cruz, María del Rosario

    2012-01-01

    Corrective feedback has been discussed mainly in second language acquisition contexts, but less has been done concerning corrective feedback in foreign language settings. In this descriptive study, conducted at a Mexican university, our aims were to identify the perceptions of instructors of English as a foreign language about corrective feedback…

  3. How Do EFL Student Teachers Face the Challenge of Using L2 in Public School Classrooms? (¿Cómo enfrentan los docentes practicantes de inglés como lengua extranjera el reto de usar una segunda lengua en las aulas de clase de la escuela pública?)

    ERIC Educational Resources Information Center

    Viáfara, John Jairo

    2011-01-01

    As an EFL Student teachers' advisor, I had constantly perceived that they regarded using the target language with their pupils inside their classroom as a challenge. That is why I became interested in investigating how thirteen student teachers in Tunja public schools faced this issue. While participants were involved in a reflective teaching…

  4. An Exploration of EFL Teachers' Awareness of the Sources of Pedagogical Knowledge in a Teacher Education Program (Una exploración del nivel de conciencia de docentes de inglés como lengua extranjera respecto a las fuentes del conocimiento pedagógico en un programa de formación de docentes)

    ERIC Educational Resources Information Center

    Macías, Diego Fernando

    2013-01-01

    This project set out to investigate the extent to which the sources of English as a foreign language teachers' pedagogical knowledge are acknowledged and addressed in a teacher education program in a public university in Colombia. It involved the participation of teacher educators and novice teachers as well as the analysis of documents. This…

  5. Effects of Strategy Instruction in an EFL Reading Comprehension Course: A Case Study (Efectos de la instrucción de estrategias en un curso de comprensión de lectura en inglés como lengua extranjera: un estudio de caso)

    ERIC Educational Resources Information Center

    Lopera Medina, Sergio

    2012-01-01

    Strategy instruction is useful in teaching contexts. This paper examines the effects of strategy instruction in an EFL reading comprehension course carried out with 26 undergraduate students at a Colombian university. As a research method, a case study was implemented. There were three instruments with which to collect data: reading comprehension…

  6. "Don't Tell My Father": Important Lessons Learned through EFL Classroom Small Talk ("No le digan a mi padre": lecciones importantes aprendidas a través de la comunión fática en el salón de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Ayala González, Gabriela; de Cervantes Orozco, Miguel Adrián Leonel; González Cabrera, Víctor Daniel; Romero Mayora, Faviola; Mugford Fowler, Gerrard Edwin

    2011-01-01

    All too often phatic communion is neglected in the English as a foreign language classroom or relegated to the level of formulaic language which merits little or no attention. In this article we argue that phatic communion plays an important role in establishing, developing and maintaining interpersonal relationships between teacher and learners…

  7. Motivation Conditions in a Foreign Language Reading Comprehension Course Offering Both a Web-Based Modality and a Face-to-Face Modality (Las condiciones de motivación en un curso de comprensión de lectura en lengua extranjera (LE) ofrecido tanto en la modalidad presencial como en la modalidad a distancia en la web)

    ERIC Educational Resources Information Center

    Lopera Medina, Sergio

    2014-01-01

    Motivation plays an important in role in education. Based on the ten macro-strategies proposed by Dörnyei and Csizér (1998), this article analyzes the motivation conditions in a foreign language reading comprehension course using both a web-based modality and a face-to-face modality. A case study was implemented as the primary research method, and…

  8. The Impact of a Teacher Development Program for Strategic Reading on EFL Teachers' Instructional Practice (El impacto de un programa de desarrollo profesional en lectura estratégica en la práctica instruccional de docentes de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Khonamri, Fatemeh; Salimi, Mahin

    2010-01-01

    Research on teacher development has been the focus of attention in recent decades. The overall aim of this study was to explore the impact of reading strategy training on high school teachers' reading instructional practices. The study was conducted in the EFL context of Iran. To meet this aim, four EFL high school teachers voluntarily took…

  9. Los padres como consejeros o coparticipes en la toma de decisiones. Serie E: [E1] logro de la participacion de los padres. cuaderno 3. Edicion para el maestro. Cuadernos para el entrenamiento de maestros de educacion bilingue. (Parents as Advisors or Participants in Decision Making. Series E: Parent Participation, Book 3. Teacher Edition. Bilingual Education Teacher Training Packet).

    ERIC Educational Resources Information Center

    Rodriguez, Rodolfo, Comp.

    This guide on training bilingual education teachers focuses on parents as advisors in the decision making process at bilingual schools. The two units, "An Introduction to Parent Participation" and "Parent Participation in Educational Decision Making," include objectives, definitions of terms, lists of materials and equipment, and learning…

  10. Teacher Activities and Adolescent Students' Participation in a Colombian EFL Classroom (Actividades de enseñanza y participación de estudiantes adolescentes en una clase de enseñanza de inglés como lengua extranjera en Colombia)

    ERIC Educational Resources Information Center

    Caicedo, Jefferson

    2015-01-01

    The present study concerns the activities teachers develop and ninth-graders' participation in responses to those activities. The objectives of this study were to identify and describe the types of teaching activities developed and how students respond to them and to show how the target language is used in the classroom. The data collection was…

  11. Pronunciation Instruction and Students' Practice to Develop Their Confidence in EFL Oral Skills (La instrucción de la pronunciación y la práctica de los estudiantes para el desarrollo de la confianza en habilidades orales en inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Tlazalo Tejeda, Ana Cristina; Basurto Santos, Nora M.

    2014-01-01

    The aim of this article is to inform on research intended to find out how pronunciation instruction of English as a foreign language was handled in the language classroom with elementary students and also understand if pronunciation instruction had an impact on students' confidence when using it. In order to do this, a qualitative case study was…

  12. Facilitating Professional Development during International Practicum: Understanding Our Work as Teacher Educators through Critical Incidents (Facilitando el desarrollo profesional durante la práctica internacional: Comprendiendo nuestro trabajo como formadores de profesores a través de incidentes críticos)

    ERIC Educational Resources Information Center

    Williams, Judy; Grierson, Arlene

    2016-01-01

    This collaborative self-study details the experiences of an Australian teacher educator and a Canadian teacher educator, who led teacher candidates on international practicum placements to the Cook Islands and Kenya respectively. Focusing on critical incidents, they collaboratively analyzed dilemmas that occurred when providing professional…

  13. For a Child, Life is a Creative Adventure: Supporting Development and Learning through Art, Music, Movement, and Dialogue. A Guide for Parents and Professionals. = Para los ninos, la vida es una aventura creativa: Como estimular el desarrollo y el aprendizaje por medio de las artes visuales, la musica, el movimiento y el dialogo. Guia para padres de familia y profesionales.

    ERIC Educational Resources Information Center

    Cohen, Elena

    Recognizing that creativity facilitates children's learning and development, the Head Start Program Performance Standards require Head Start programs to include opportunities for creative self-expression. This guide with accompanying videotape, both in English- and Spanish- language versions, encourages and assists adults to support children's…

  14. Pedagogical Factors That Influence EFL Teaching: Some Considerations for Teachers' Professional Development (Factores pedagógicos que influyen en la enseñanza del inglés como lengua extranjera: algunas consideraciones para el desarrollo profesional de docentes)

    ERIC Educational Resources Information Center

    Abad, José Vicente

    2013-01-01

    In this article we present the results of a qualitative research study on the pedagogical factors that influence English teaching in four public schools of Medellín, Colombia. Twelve teachers were interviewed regarding three linguistic principles: communicative competence, native language effect, and interlanguage. The data analysis led to the…

  15. Experiencias interculturales y la pedagogia de la anglofonia en la ensenanza de ingles como lengua extranjera (EILE) desde una perspectiva deweyana. Working Paper (A Deweyan Perspective on Cross-Cultural Experiences and Anglophone Pedagogy in the Teaching of English as a Foreign Language. Working Paper).

    ERIC Educational Resources Information Center

    Zoreda, Margaret Lee

    This paper discusses a framework for teaching English as a foreign language that incorporates significant cultural content and fosters critical encounters with Anglophone culture. It reviews relevant contemporary perspectives for understanding cross-cultural processes within the foreign language teaching environment with emphasis on the issue of…

  16. The Implications of Orthographic Intraference for the Teaching and Description of ESL: The Educated Nigerian English Examples (Implicaciones de la Intraferencia Ortográfica para la Enseñanza y Descripción del Inglés como Segunda Lengua: Ejemplos Inglés Nigeriano Formal)

    ERIC Educational Resources Information Center

    Ekundayo, Omowumi Steve Bode

    2015-01-01

    This paper examines orthographic intraference and its implications for teaching and describing English as a second language (ESL). Orthographic intraference is used here to denote instances of single word spelling, acronyms, mix up of homophones, homonyms and compound word spelling arising not from interference but from orthographic rules and…

  17. Efectos Especiales de Anclaje (Estudio sobre Regresiones de Juicios Condicionales). Parte 2: Invariancia del Juicio No-Condicional Como Valor Estandar Para el Juicio Condicional (Special Effects of Anchoring (Study of Regression of Conditional Judgements) Part 2: Invariance of Unconditional Judgments as Standard Value for the Conditional Judgment). Publication No. 31.

    ERIC Educational Resources Information Center

    Lopez Alonso, A. O.

    From the best-fit lines corresponding to sets of families of conditional judgements, the constant stimulus family and the constant condition family, both defined for a same scale object, the coordinate values of the point of intersection of both lines (indifference point) are obtained. These values are studied in relation to the mean values of the…

  18. EFL Teenagers' Social Identity Representation in a Virtual Learning Community on Facebook (Representación de la identidad social de los estudiantes adolescentes de inglés como lengua extranjera en una comunidad de aprendizaje virtual en Facebook)

    ERIC Educational Resources Information Center

    Jiménez Guamán, Laura Verónica

    2012-01-01

    In this article I report the findings of a descriptive and interpretative qualitative study carried out in a public school in Bogotá, Colombia. The study aimed at analyzing, describing and exploring teenage students' social identity representation as observed in their participation in a learning community on Facebook. Data were collected from…

  19. Building Adult Relationships: Are You Treated as an Equal in Your Family? (A Pamphlet for People with Disbilities) [and] Como Establecer Relaciones Adultas: Se Lo Trata a UD. Igual que a Los Demas Adultos en Su Familia? (Un Panfleto para las Personas con Impedimentos).

    ERIC Educational Resources Information Center

    Baron, Carla

    Two booklets, in English and Spanish, are addressed to disabled adults and offer guidelines for building adult relationships within the family. Stressed are the importance of feeling good about oneself, learning to make decisions, and developing good communication skills so that family balance is maintained. Also included are lists of the types of…

  20. Metacognitive Awareness and Comprehension Monitoring in Reading Ability of Iranian EFL Learners (Monitoreo de la conciencia metacognitiva y de la comprensión en la habilidad lectora de estudiantes iraníes de inglés como lengua extranjera)

    ERIC Educational Resources Information Center

    Khonamri, Fatemeh; Mahmoudi Kojidi, Elahe

    2011-01-01

    We report an investigation on the relationship between metacognitive awareness of reading strategies and comprehension monitoring of language learners in English as a foreign language context. Participants were thirty first year university students majoring in electronics. They completed a questionnaire aimed at discerning the strategies that…

  1. Mapping of soil-sediment systems contaminations around a metal-ore smelter. The example of Cu in Lubumbashi (RD Congo).

    NASA Astrophysics Data System (ADS)

    Mpundu, M.; Mukobo, R. P.; Kaya, D.; Faucon, M. P.; Andres, L.; Ngongo, M.; Meerts, P. J.; Colinet, G.

    2009-04-01

    The Katanga is famous for its high richness in metal ores, mainly Cu- and Co-minerals. The ore treatments activities lead to metal spreading in the environment which do endanger the viability of ecosystems and human health. The contaminations of soils and sediments around the Gecamines smelter in Lubumbashi have been evaluated through a multi-scale approach. In the first stage, a reference system about the natural contents in soils has been implemented. The main units of the detailed (1:20 000) soil map have been characterized through field observations and laboratory determinations : acido-basic and organic status, particle size distribution, cationic exchange capacity, total contents in Al, Fe, Mn, Cu, Co, Cd, Pb, Zn. An exploratory mapping of soil contaminations (Cu, Co, Cd, Pb, Zn) centered on the Gecamines cheminey was then conducted as a second stage of the approach. Detailed investigations were finally performed in the Gecamines district where signs of soil degradation were the highest. The spatial continuity and the differenciation (C : C0+C ratio) of the studied parameters appeared weak. No clear effect of the dominant wind direction on the spatial distribution of the contaminants could be identified despite a clear degradation of the ecosystem in the area under dominant wind. However the detailed approach showed evidences of (i) significant wind deposits in the Gecamines district, (ii) and local man-made deposits but also (ii) important processes of redistribution in the landscape through erosion/sedimentation or anthropic activities. Our results point out the difficulty to identify the sources of contaminations in an urban environment and stress the need to have approaches with complementary levels of details.

  2. Oxazines: A New Class of Second-Order Nonlinear Optical Switches.

    PubMed

    Beaujean, Pierre; Bondu, Flavie; Plaquet, Aurélie; Garcia-Amorós, Jaume; Cusido, Janet; Raymo, Françisco M; Castet, Frédéric; Rodriguez, Vincent; Champagne, Benoît

    2016-04-20

    A combined experimental-theoretical investigation has revealed that oxazine-based compounds are multiaddressable, multistate, and multifunctional molecular switches exhibiting contrasts of both linear and second-order nonlinear optical properties. The switching properties are particularly large when the substituent is a donor group. In this study, the cleavage of the C-O bond at the junction of the indole and oxazine cycles (of the closed a forms) is acido-triggered, leading to an open form (b(+)) characterized by larger first hyperpolarizabilities (βHRS) and smaller excitation energies than in the closed form. These results are confirmed and interpreted utilizing ab initio calculations that have been carried out on a broad set of compounds to unravel the role of the substituent. With respect to acceptor groups, oxazines bearing donor groups are characterized not only by larger βHRS and βHRS contrast ratios but also by smaller excitation energies, larger opening-induced charge transfer, and reduction of the bond length alternation, as well as smaller Gibbs energies of the opening reaction. Compared to protonated open forms (b(+)), calculations on the zwitterionic open forms (b) have pointed out similarities in the long-wavelength UV/vis absorption spectra, whereas their βHRS values might differ strongly as a function of the substituent. Indeed, the open forms present two NLOphores, the indoleninium-substituent entity and the nitrophenol (present in the protonated open form, b(+)) or nitrophenolate (present in the zwitterionic open form, b) moiety. Then, nitrophenolate displays a larger first hyperpolarizability than nitrophenol and the β tensor of the two entities might reinforce or cancel each other. PMID:26996994

  3. 13,16-Dimethyl Octacosanedioic Acid (iso-Diabolic Acid), a Common Membrane-Spanning Lipid of Acidobacteria Subdivisions 1 and 3 ▿ †

    PubMed Central

    Sinninghe Damsté, Jaap S.; Rijpstra, W. Irene C.; Hopmans, Ellen C.; Weijers, Johan W. H.; Foesel, Bärbel U.; Overmann, Jörg; Dedysh, Svetlana N.

    2011-01-01

    The distribution of membrane lipids of 17 different strains representing 13 species of subdivisions 1 and 3 of the phylum Acidobacteria, a highly diverse phylum of the Bacteria, were examined by hydrolysis and gas chromatography-mass spectrometry (MS) and by high-performance liquid chromatography-MS of intact polar lipids. Upon both acid and base hydrolyses of total cell material, the uncommon membrane-spanning lipid 13,16-dimethyl octacosanedioic acid (iso-diabolic acid) was released in substantial amounts (22 to 43% of the total fatty acids) from all of the acidobacteria studied. This lipid has previously been encountered only in thermophilic Thermoanaerobacter species but bears a structural resemblance to the alkyl chains of bacterial glycerol dialkyl glycerol tetraethers (GDGTs) that occur ubiquitously in peat and soil and are suspected to be produced by acidobacteria. As reported previously, most species also contained iso-C15 and C16:1ω7C as major fatty acids but the presence of iso-diabolic acid was unnoticed in previous studies, most probably because the complex lipid that contained this moiety was not extractable from the cells; it could only be released by hydrolysis. Direct analysis of intact polar lipids in the Bligh-Dyer extract of three acidobacterial strains, indeed, did not reveal any membrane-spanning lipids containing iso-diabolic acid. In 3 of the 17 strains, ether-bound iso-diabolic acid was detected after hydrolysis of the cells, including one branched GDGT containing iso-diabolic acid-derived alkyl chains. Since the GDGT distribution in soils is much more complex, branched GDGTs in soil likely also originate from other (acido)bacteria capable of biosynthesizing these components. PMID:21515715

  4. [Folate and iron in fertile age women from a Venezuelan community affected by incidence of neural tube defects].

    PubMed

    Mariela, Montilva; Jham, Papale; Nieves, García-Casal María; Yelitza, Berné; Yudith, Ontiveros; Lourdes, Durán

    2010-06-01

    The objective of this transversal study was to determine folate and iron nutritional status of women in fertile age from Municipio Jiménez, Lara State, Venezuela. The sampling was probabilistic by conglomerates from the urban and rural areas, selecting 15 conglomerates from which women between 12 and 45 years (269), were studied. After signing informed consent, participating were interviewed for personal data, antecedents related to folate and iron, socioeconomic data (Graffar-Mendez Castellano method and unsatisfied basic needs). In blood sample was determined Hemoglobin, and Erythrocytic Folate (FE). Serum was obtained to determine Ferritin and Serum Folate (FS). 53.53% of the sample presented low FS levels, 10.78% were FS deficient. Severe FE deficiency was present in 80.7% of the cases, moderate deficiency affected 5.9%. For both tests, median was higher for women in treatment with Acido Fólico or pregnant (p = 0.000), median for FE was higher for adults (p = 0.001) and in non poor women (p = 0.011). There were no significant differences for coffee, alcohol, anticonceptive consumption, urban or rural resident or socioeconomic strata. The prevalence of anemia was 11.2% being significantly more frequent in adults than in adolescents (p = 0.029) and in urban women (p = 0.042). Low ferritin were found in 37.3% of the sample, the effect of different variables was not statistically significant. In conclusion, there is a high prevalence of iron and folate deficiencies in women of fertile age from Municipio Jiménez, which could constitute a conditioning factor for the appearance of neural tube defects. PMID:21427880

  5. pH as a Driver for Ammonia-Oxidizing Archaea in Forest Soils.

    PubMed

    Stempfhuber, Barbara; Engel, Marion; Fischer, Doreen; Neskovic-Prit, Ganna; Wubet, Tesfaye; Schöning, Ingo; Gubry-Rangin, Cécile; Kublik, Susanne; Schloter-Hai, Brigitte; Rattei, Thomas; Welzl, Gerhard; Nicol, Graeme W; Schrumpf, Marion; Buscot, Francois; Prosser, James I; Schloter, Michael

    2015-05-01

    In this study, we investigated the impact of soil pH on the diversity and abundance of archaeal ammonia oxidizers in 27 different forest soils across Germany. DNA was extracted from topsoil samples, the amoA gene, encoding ammonia monooxygenase, was amplified; and the amplicons were sequenced using a 454-based pyrosequencing approach. As expected, the ratio of archaeal (AOA) to bacterial (AOB) ammonia oxidizers' amoA genes increased sharply with decreasing soil pH. The diversity of AOA differed significantly between sites with ultra-acidic soil pH (<3.5) and sites with higher pH values. The major OTUs from soil samples with low pH could be detected at each site with a soil pH <3.5 but not at sites with pH >4.5, regardless of geographic position and vegetation. These OTUs could be related to the Nitrosotalea group 1.1 and the Nitrososphaera subcluster 7.2, respectively, and showed significant similarities to OTUs described from other acidic environments. Conversely, none of the major OTUs typical of sites with a soil pH >4.6 could be found in the ultra- and extreme acidic soils. Based on a comparison with the amoA gene sequence data from a previous study performed on agricultural soils, we could clearly show that the development of AOA communities in soils with ultra-acidic pH (<3.5) is mainly triggered by soil pH and is not influenced significantly by the type of land use, the soil type, or the geographic position of the site, which was observed for sites with acido-neutral soil pH. PMID:25501889

  6. Arthrite à pneumocoque chez un adulte immunocompétent

    PubMed Central

    Chemsi, Hicham; Chadli, Maryama; Sekhsokh, Yassine

    2015-01-01

    Les infections à pneumocoques sont avant tout respiratoires, ORL et méningées. Les infections ostéoarticulaires à pneumocoque ont la particularité de survenir dans moins de 20% des cas chez l'adulte sain. Habituellement, un ou plusieurs facteurs favorisants sont retrouvés. Toutefois, nous rapportons lors de cette observation le cas d'une arthrite à Streptococcus pneumoniae chez un adulte immunocompétent sans facteurs prédisposant. Patient âgé de 66 ans, diabétique de type II, a été hospitalisé pour une décompensation acido-cétosique et une monoarthrite du genou droit. Ce patient était fébrile (39°C) et présentait un genou droit inflammatoire en flexion avec rougeur et chaleur locale et un choc rotulien. Une ponction articulaire avec d'autres examens ont été réalisés pour confirmation d'une arthrite septique à pneumocoque. Le résultat de la ponction articulaire réalisée a montré un liquide jaune citron trouble avec 480 000 leucocytes/mm3 à prédominance polynucléaires neutrophiles. L'examen direct a montré des coccis à Gram positif en diplocoque, la culture a permis d'isoler un Streptococcus pneumoniae sensible à la pénicilline G. L’évolution clinique et biologique de l'arthrite du genou était favorable. Un déficit immunitaire, un asplénisme anatomique ou fonctionnel peuvent être en cause. L'alcoolisme est un facteur favorisant mais le mécanisme n'est pas clairement élucidé. La présence de matériel prothétique, peut favoriser une localisation septique. Ces facteurs de risque doivent être systématiquement recherchés, notamment en cas d'infection grave ou récidivante, une antibioprophylaxie ou une vaccination pouvant être proposées chez les sujets à haut risque. PMID:26327976

  7. Prise en charge diagnostique et thérapeutique de la tuberculose ganglionnaire en Tunisie

    PubMed Central

    Ben Brahim, Hajer; Kooli, Ikbel; Aouam, Abir; Toumi, Adnene; Loussaief, Chawki; Koubaa, Jamel; Chakroun, Mohamed

    2014-01-01

    La tuberculose ganglionnaire est la localisation extra-pulmonaire la plus fréquente de la tuberculose. Nous nous proposons dans ce travail d’étudier les modalités diagnostiques, thérapeutiques et évolutives de cette localisation. Il s'agit d'une étude rétrospective portant sur 100 cas de tuberculose ganglionnaire. L’âge moyen était de 35 ± 15 ans (15-85 ans). Aucun malade n’était VIH positif. L'aire cervicale était la plus touchée (93 cas). L'intradermo-réaction à la tuberculine était positive dans 76/91 cas (83,5%). L'examen bactériologique des prélèvements au niveau des ganglions atteints avait mis en évidence des bacilles acido-alcoolo-résistants à l'examen direct dans 2/31 cas (6,4%) et la culture avait isolé Mycobacteruim tuberculosis dans 1/31 cas (3,2%). La cytoponction ganglionnaire (FNAC) était évocatrice de tuberculose dans 35/42 cas (83,3%). La biopsie ganglionnaire était réalisée dans 69 cas et avait permis de retenir le diagnostic de tuberculose dans tous les cas. La FNAC, comparativement à la biopsie, avait permis de raccourcir significativement le délai de la prise en charge (15,1 vs 22,8 jours; p=0,001) et la durée d'hospitalisation (17,3 vs 24,6; p=0,004). La durée moyenne du traitement antituberculeux était de 9,8 ± 4,6 mois (7 à 44 mois). Le traitement chirurgical initial avait raccourci significativement la durée du traitement médical. Il n'avait pas d'impact sur le taux de guérison. Nous avons noté 10 cas de réponse paradoxale aux antituberculeux, quatre cas de résistance clinique et une rechute dans deux cas. La tuberculose ganglionnaire pose un problème diagnostique et thérapeutique. La microbiologie est d'un faible apport. La FNAC est un moyen diagnostique très utiles dans les pays endémiques et à faibles ressources. Un traitement médical seul permet d’éviter les inconvénients de la chirurgie. PMID:25829976

  8. Using short-lived nuclides of the U- and Th-series to probe the kinetics of colloid migration in forested soils

    NASA Astrophysics Data System (ADS)

    Rihs, Sophie; Prunier, Jonathan; Thien, Bruno; Lemarchand, Damien; Pierret, Marie-Claire; Chabaux, François

    2011-12-01

    The recent chemical dynamics of a podzolic forest soil section (from the Strengbach watershed, France) was investigated using U- and Th-series nuclides. Analyses of ( 238U), ( 230Th), ( 226Ra), ( 232Th), ( 228Ra) and ( 228Th) activities in the soil particles, the seepage waters, and the mature leaves of the beech trees growing on this soil were performed by TIMS or gamma spectrometry. The simultaneous analysis of the different soil ( sl) compartments allows to demonstrate that a preferential Th leaching over Ra must be assumed to explain the ( 226Ra/ 230Th), ( 228Ra/ 232Th) and ( 228Th/ 228Ra) disequilibria recorded in the soil particles. The overall Ra- and Th- transfer schemes are entirely consistent with the prevailing acido-complexolysis weathering mechanism in podzols. Using a continuous open-system leaching model, the ( 226Ra/ 230Th) and ( 228Ra/ 232Th) disequilibria measured in the different soil layers enable dating of the contemporary processes occurring in this soil. In this way, we have determined that a preferential Th-leaching from the shallow Ah horizon, due to a strong complexation with organic colloids, began fairly recently (18 years ago at most). The continual increase in pH recorded in precipitations over the last 20 years is assumed to be the cause of this enhanced organic complexation. A lower soil horizon (50-60 cm) is also affected by preferential Th leaching, though lasting over several centuries at least, with a much smaller leaching rate. The migration of Th isotopes through this soil section might hence be used as a tracer for the organic colloids migration and the induced radioactive disequilibria demonstrate to be useful for assessing the colloidal migration kinetics in a forested soil. Ra and Th isotopic ratios also appear to be valuable tracers of some mineral-water-plant interactions occurring in soil. The ( 228Ra/ 226Ra) ratio enables discrimination of the Ra flux originating from leaf degradation from that originating from mineral

  9. Methanotrophic activity and diversity of methanotrophs in volcanic geothermal soils at Pantelleria (Italy)

    NASA Astrophysics Data System (ADS)

    Gagliano, A. L.; D'Alessandro, W.; Tagliavia, M.; Parello, F.; Quatrini, P.

    2014-10-01

    Volcanic and geothermal systems emit endogenous gases by widespread degassing from soils, including CH4, a greenhouse gas twenty-five times as potent as CO2. Recently, it has been demonstrated that volcanic or geothermal soils are not only a source of methane, but are also sites of methanotrophic activity. Methanotrophs are able to consume 10-40 Tg of CH4 a-1 and to trap more than 50% of the methane degassing through the soils. We report on methane microbial oxidation in the geothermally most active site of Pantelleria (Italy), Favara Grande, whose total methane emission was previously estimated at about 2.5 Mg a-1 (t a-1). Laboratory incubation experiments with three top-soil samples from Favara Grande indicated methane consumption values of up to 59.2 nmol g-1 soil d.w. h-1. One of the three sites, FAV2, where the highest oxidation rate was detected, was further analysed on a vertical soil profile, the maximum methane consumption was measured in the top-soil layer, and values greater than 6.23 nmol g-1 h-1 were still detected up to a depth of 13 cm. The highest consumption rate was measured at 37 °C, but a still detectable consumption at 80 °C (> 1.25 nmol g-1 h-1) was recorded. The soil total DNA extracted from the three samples was probed by Polymerase Chain Reaction (PCR) using standard proteobacterial primers and newly designed verrucomicrobial primers, targeting the unique methane monooxygenase gene pmoA; the presence of methanotrophs was detected at sites FAV2 and FAV3, but not at FAV1, where harsher chemical-physical conditions and negligible methane oxidation were detected. The pmoA gene libraries from the most active site (FAV2) pointed to a high diversity of gammaproteobacterial methanotrophs, distantly related to Methylocaldum-Metylococcus genera, and the presence of the newly discovered acido-thermophilic Verrucomicrobia methanotrophs. Alphaproteobacteria of the genus Methylocystis were isolated from enrichment cultures under a methane

  10. Overloaded elution band profiles of ionizable compounds in reversed-phase liquid chromatography: Influence of the competition between the neutral and the ionic species

    SciTech Connect

    Gritti, Fabrice; Guiochon, Georges A

    2008-01-01

    The parameters that affect the shape of the band profiles of acido-basic compounds under moderately overloaded conditions (sample size less than 500 nmol for a conventional column) in RPLC are discussed. Only analytes that have a single pK{sub a} are considered. In the buffer mobile phase used for their elution, their dissociation may, under certain conditions, cause a significant pH perturbation during the passage of the band. Two consecutive injections (3.3 and 10 {micro}L) of each one of three sample solutions (0.5, 5, and 50 mM) of ten compounds were injected on five C{sub 18}-bonded packing materials, including the 5 {micro}m Xterra-C{sub 18} (121 {angstrom}), 5 {micro}m Gemini-C{sub 18} (110 {angstrom}), 5 {micro}m Luna-C{sub 18}(2) (93 {angstrom}), 3.5 {micro}m Extend-C{sub 18} (80 {angstrom}), and 2.7 {micro}m Halo-C{sub 18} (90 {angstrom}). The mobile phase was an aqueous solution of methanol buffered at a constant {sub W}{sup W}pH of 6, with a phosphate buffer. The total concentration of the phosphate groups was constant at 50 mM. The methanol concentration was adjusted to keep all the retention factors between 1 and 10. The compounds injected were phenol, caffeine, 3-phenyl 1-propanol, 2-phenyl butyric acid, amphetamine, aniline, benzylamine, p-toluidine, procainamidium chloride, and propranololium chloride. Depending on the relative values of the analyte pK{sub a} and the buffer solution pH, these analytes elute as the neutral, the cationic, or the anionic species. The influence of structural parameters such as the charge, the size, and the hydrophobicity of the analytes on the shape of its overloaded band profile is discussed. Simple but general rules predict these shapes. An original adsorption model is proposed that accounts for the unusual peak shapes observed when the analyte is partially dissociated in the buffer solution during its elution.

  11. Methanotrophic activity and bacterial diversity in volcanic-geothermal soils at Pantelleria island (Italy)

    NASA Astrophysics Data System (ADS)

    Gagliano, A. L.; D'Alessandro, W.; Tagliavia, M.; Parello, F.; Quatrini, P.

    2014-04-01

    Volcanic and geothermal systems emit endogenous gases by widespread degassing from soils, including CH4, a greenhouse gas twenty-five times as potent as CO2. Recently, it has been demonstrated that volcanic/geothermal soils are source of methane, but also sites of methanotrophic activity. Methanotrophs are able to consume 10-40 Tg of CH4 a-1 and to trap more than 50% of the methane degassing through the soils. We report on methane microbial oxidation in the geothermally most active site of Pantelleria island (Italy), Favara Grande, whose total methane emission was previously estimated in about 2.5 t a-1. Laboratory incubation experiments with three top-soil samples from Favara Grande indicated methane consumption values up to 950 ng g-1 dry soil h-1. One of the three sites, FAV2, where the highest oxidation rate was detected, was further analysed on a vertical soil profile and the maximum methane consumption was measured in the top-soil layer but values > 100 ng g-1 h-1 were maintained up to a depth of 15 cm. The highest consumption rate was measured at 37 °C, but a still recognizable consumption at 80 °C (> 20 ng g-1 h-1) was recorded. In order to estimate the bacterial diversity, total soil DNA was extracted from Favara Grande and analysed using a Temporal Temperature Gradient gel Electrophoresis (TTGE) analysis of the amplified bacterial 16S rRNA gene. The three soil samples were probed by PCR using standard proteobacterial primers and newly designed verrucomicrobial primers targeting the unique methane monooxygenase gene pmoA; the presence of methanotrophs was detected in sites FAV2 and FAV3, but not in FAV1, where harsher chemical-physical conditions and negligible methane oxidation were detected. The pmoA gene libraries from the most active site FAV2 pointed out a high diversity of gammaproteobacterial methanotrophs distantly related to Methylococcus/Methylothermus genera and the presence of the newly discovered acido-thermophilic methanotrophs

  12. The role of extremophile in the redox reaction of Fe and As relating with the formation of secondary phase mineral in extreme environment, Norris Geyser Basin, Yellowstone National Park, USA

    NASA Astrophysics Data System (ADS)

    Koo, T. H.; Kim, J. Y.; Park, K. R.; Jung, D. H.; Geesey, G. G.; Kim, J. W.

    2015-12-01

    Redox reaction associated with microbial elemental respiration is a ubiquitous process in sediments and suspended particles at various temperatures or pH/Eh conditions. Particularly, changes in elemental redox states (structural or dissolved elemental form) induced by microbial respiration result in the unexpected biogeochemical reactions in the light of biotic/abiotic mineralization. The objective of the present study is, therefore to investigate the secondary phase mineralization through a-/biogeochemical Fe and As redox cycling in the acido-hyperhtermal Norris Geyser Basin (NGB) in Yellowstone National Park, USA, typical of the extreme condition. X-ray diffraction, scanning electron microscope with energy dispersive x-ray spectroscopy, X-ray absorption near edge structure, inductively coupled plasma-atomic emission spectrometer and liquid chromatography with ICP-mass spectroscopy with filtrated supernatant were performed for the mineralogical and hydro-geochemical analysis. The clay slurry collected from the active hot-spring of the NGB area (pH=3.5 and Temperature=78 ℃) was incubated with ("enrichment") or without the growth medium ("natural"). The control was prepared in the same condition except adding the glutaraldehyde to eliminate the microbial activity. The secondary phase mineral formation of the oxidative phase of Fe and As, and K identified as 'Pharmacosiderite' only appeared in the enrichment set suggesting a role of extremophiles in the mineral formation. The considerable population of Fe-oxidizer (Metallosphera yellowstonensis MK-1) and As-oxidizer (Sulfurihydrogenibium sp.) was measured by phylogenetic analysis in the present study area. The inhibition of As-oxidation in the low pH conditions was reported in the previous study, however the As-redox reaction was observed and consequently, precipitated the Pharmacosiderite only in the enrichment set suggesting a biotic mineralization. The present study collectively suggests that the microbial

  13. [In situ FTIR and XPS study on selective hydrodesulfurization catalyst of FCC gasoline].

    PubMed

    Qiherima; Yuan, Hui; Zhang, Yun-hong; Li, Hui-feng; Xu, Guang-tong

    2011-07-01

    Improvement of the selectivity of hydrodesulfurization (HDS) for hydrogenation (HYD) of olefins is crucial to produce sulfur-free (S < 0.001%) gasoline from fluid catalytic-cracked (FCC) gasoline. A series of sulfided CoMo/Al2O3 catalysts with different metal loading were prepared by pore-filling impregnation. MoS2 and COMoS active phases on the surface of sulfided COMo/Al2O3 catalyst were identified and analyzed quantitatively by XPS and in-situ FTIR of adsorbed CO. The results reveal that the increase in COMoS phase on the catalyst surface improves the HDS activity and selectivity. And the HDS selectivity correlates linearly with the ratio of active site number of CoMoS and MoS2, the higher the ratio of active site number of CoMoS and MoS2, the better the HDS selectivity. In situ variable temperature FTIR analysis shows that CoMoS phase has stronger electron accepting ability than MoS2. The strong electron deficient property of CoMoS active sites is the main reason for its excellent HDS activity and selectivity. PMID:21942017

  14. Effects of Long-Term Acid-Mine Drainage Contamination on Diversity and Activity of Sulfate-Reducing Bacteria in a Natural Salt Marsh.

    NASA Astrophysics Data System (ADS)

    Moreau, J. W.; Banfield, J. F.

    2003-12-01

    -grained black muds that are distinguishable from coarser pyrite cinders, and exhibit a noticeably strong sulfide odor. Aero- and halo-tolerant SRB were enriched from circumneutral pH cores, and we hypothesize that acido-tolerant SRB may also be present. Analysis of restriction fragment length polymorphism of whole community 16S rDNA extracted from each core shows an expected increase in diversity between acidic and circumneutal sediments, and clone libraries from both contaminated and uncontaminated marsh sediments are being compared to assess the impact of long-term contamination. References: Webb et al. 1998, J. Appl. Microbio., 84, 240-248; Moreau et al. 2003, Amer. Min., in review; URS Corp. 2001, Report 51.09967067.00.

  15. Zinc, cadmium, and copper mobility and accumulation in reeds (Phragmites australis) in urban sediments from two stormwater infiltration basins

    NASA Astrophysics Data System (ADS)

    Bedell, J.-P.; Saulais, S.; Delolme, C.

    2012-04-01

    Infiltration basins are stormwater management techniques that are widely used to reduce stormwater volume. The settling of stormwater particles leads to a contaminated sediment layer at the basin surface. Phragmites australis used in constructed wetlands are widely present in infiltration basins. Such plant can play a role on the fate of heavy metals either directly by their uptake or indirectly by modification of physico-chemical characteristics of the sediment. The aim of this study is to assess Zn, Cd and Cu potential mobility and their bioaccumulation by reeds during plant's growth in urban sediments offering two different geochemical contexts. Methodology is based on the monitoring (in june, august and december) of physico-chemical characteristics of sediment deposit in two basins. These basins, "Minerve" and "Grézieu", located on both sides of Lyon city are characteristic of two different geochemical context. "Minerve" is in the east and "Grézieu" in the west part. The geology of the eastern part of Lyon is characterized by carbonated fluvio-glacial deposits. In the western part, the subsoil is mainly composed of gneiss and granit. Moreover, 20 cm of gravel and a sand layer were initially added at the surface of the "Grézieu" basin. In "Minerve", a clay material was initially added and a filter trench was built along the basin to allow water infiltration. We characterized the sediment deposit by the identification of their geochemical characteristics (Zn, Cu, Cd, total content, pH, CEC, C/N, carbonates and major elements contents …). Then we studied the potential mobility of the three metals by single chemical extraction (CaCl2 for the exchangeable phase, acetate buffer for the acido-soluble phase and diethylenetriamine-pentaacetic acid (DTPA) for the fraction associated to the organic matter). The accumulation of Zn, Cd and Cu in aerial parts and roots of the reeds was also measured. The results show clearly that "Grézieu" sediment is more enriched in

  16. Facteurs de risque de mortalité par tuberculose pulmonaire

    PubMed Central

    Janah, Hicham; Souhi, Hicham; Kouismi, Hatim; Mark, Karima; Zahraoui, Rachida; Benamor, Jouda; Soualhi, Mona; Bourkadi, Jamal Eddine

    2014-01-01

    La tuberculose est une maladie infectieuse transmissible provoquée par myco-bacterium tuberculosis (bacille de Koch ou BK). Elle représente, selon les estimations del'Organisation Mondiale de la Santé (OMS), l'une des pathologies infectieuses causant le plus de décès au niveau mondial avec plus de 1 million de décès par an. Pour déterminer les facteurs de risque de mortalité au cours de la tuberculose pulmonaire à microscopie positive nous avons mené une étude rétrospective portant sur tous les cas de tuberculose pulmonaire à microscopie positive et qui étaient décédés au cours de leur hospitalisation. Cette étude a colligé 1803 cas de tuberculose sur une période de 2 ans et demi dont 46 sont décédés. La prévalence de décès est de 2,55%. La population se répartit en 32 hommes et 14 femmes. L’âge moyen était de 53ans ± 17 ans. Le tabagisme était retrouvé chez la moitié des cas. Une comorbidité était retrouvée dans 43%, avec 17% de diabète. Le délai de diagnostic avait une médiane de 60 jours avec percentile (30j; 105j). La symptomatologie clinique était dominée par la toux, la dyspnée et les expectorations soit respectivement: 97,8%, 69,6% et 67,4% des cas. Sur le plan radiologique les lésions étaient diffuses et bilatérales dans 76,1% des cas. Tous les patients étaient mis sous SRHZ. 11% avaient présenté une toxicité aux antibacillaires (de type hépatiques dans 3 cas et neurologiques dans 2 cas). Le délai médian de décès était de 8,5 jours (5j; 17j). Les causes de décès retrouvées étaient: Une hépatite fulminante (3 cas), une décompensation acido-cétosique (3 cas), un SDRA (2 cas), des hémoptysies foudroyantes (2 cas), et respectivement un cas secondaire à une décompensation de BPCO, une décompensation cardiaque, une hypoglycémie et un tableau d'anasarque. Cette étude suggère que le terrain, le retard diagnostique et les effets secondaires du traitement sont les principaux facteurs de risque de

  17. Peak shapes of acids and bases under overloaded conditions in reversed-phase liquid chromatography, with weakly buffered mobile phases of various pH: A thermodynamic interpretation

    SciTech Connect

    Gritti, Fabrice; Guiochon, Georges A

    2009-01-01

    We measured overloaded band profiles for a series of nine compounds (phenol, caffeine, 3-phenyl 1-propanol, 2-phenylbutyric acid, amphetamine, aniline, benzylamine, p-toluidine, and procainamidium chloride) on columns packed with four different C{sub 18}-bonded packing materials: XTerra-C{sub 18}, Gemini-C{sub 18}, Luna-C{sub 18}(2), and Halo-C{sub 18}, using buffered methanol-water mobile phases. The {sub W}{sup S}pH of the mobile phase was increased from 2.6 to 11.3. The buffer concentration (either phosphate, acetate, or carbonate buffers) was set constant at values below the maximum concentration of the sample in the band. The influence of the surface chemistry of the packing material on the retention and the shape of the peaks was investigated. Adsorbents having a hybrid inorganic/organic structure tend to give peaks exhibiting moderate or little tailing. The retention and the shape of the band profiles can easily be interpreted at {sub W}{sup S}pHs that are well above or well below the {sub W}{sup S}pK{sub a} of the compound studied. In contrast, the peak shapes in the intermediary pH range (i.e., close to the compound {sub W}{sup S}pK{sub a}) have rarely been studied. These shapes reveal the complexity of the competitive adsorption behavior of couples of acido-basic conjugated compounds at {sub W}{sup S}pHs that are close to their {sub W}{sup S}pK{sub a}. They also reveal the role of the buffer capacity on the resulting peak shape. With increasing {sub W}{sup S}pH, the overloaded profiles are first langmuirian (isotherm type I) at low {sub W}{sup S}pHs, they become S-shaped (isotherm type II), then anti-langmuirian (isotherm type III), S-shaped again at intermediate {sub W}{sup S}pHs, and finally return to a langmuirian shape at high {sub W}{sup S}pHs. A new general adsorption isotherm model that takes into account the dissociation equilibrium of conjugated acidic and basic species in the bulk mobile phase accounts for these transient band shapes. An

  18. Effet de la substitution du cuivre par du lithium sur les proprietes de l'oxyde spinelle lithium(x)cuivre(y-x)cobalt(3-y)oxygen(4) etudie pour l'electrocatalyse de la reaction de degagement de l'oxygene en milieu alcalin

    NASA Astrophysics Data System (ADS)

    Fatih, Khalid

    L'electrolyse de l'eau demeure la seule technologie industrielle de generation de l'hydrogene et de l'oxygene tres purs sans rejet de CO2 dans l'atmosphere, ce qui le rend tres attrayant par rapport a la combustion de carburants fossiles qui provoque presentement de serieux problemes environnementaux. Dans le but d'ameliorer le rendement de ce procede, nous avons developpe de nouveaux materiaux d'anode peu couteux, a base de l'oxyde mixte CuyCo3-yO 4, qui possedent une cinetique rapide pour la reaction de degagement de l'oxygene (RDO). Cette reaction suscite un interet particulier en raison de la surtension d'activation relativement elevee a l'anode qui cause la principale perte de rendement du procede. Une etude systematique a ete effectuee sur la substitution du Cu par du Li (0 a 40%), afin d'elucider les proprietes electrocatalytiques des oxydes LixCuy-xCo3-yO4. Ces oxydes, prepares sous forme de poudres par decomposition thermique des nitrates precurseurs entre 300 et 500°C, ont montre (DRX et FTIR) une structure spinelle inverse non-stcechiometrique avec une diminution du volume de la maille cristalline. La surface specifique par BET est d'environ 6 m2 g-1. Le pcn, obtenu par titrage acido-basique, a indique une diminution de la force du lien M-OH avec le taux du Li dans l'oxyde. Les analyses par XPS, realisees sur des films d'oxyde prepares par nebulisation reactive sur un substrat lisse de nickel, revelent un enrichissement de la surface en Cu a partir de 30% Li, et la presence des cations de surface Co2+, Co3+, Cu +, Cu2+ et Cu3+. La concentration de ce dernier montre un maximum a 10 et 20% Li. Suite a la substitution du Cu par du Li, la compensation de la charge serait assuree principalement par la formation d'especes Cu3+ pour les oxydes contenant jusqu'a 20% Li, et par la formation d'especes Co3+ aux taux de substitution superieurs. Les micrographies MEB montrent une morphologie hemispherique des particules d'oxyde reparties uniformement sur le substrat

  19. Assessment of a sequential extraction protocol by examining solution chemistry and mineralogical evolution

    NASA Astrophysics Data System (ADS)

    Maubec, Nicolas; Pauwels, Hélène; Noël, Hervé; Bourrat, Xavier

    2015-04-01

    of them are able to leach several solid phases. In this context, the aim of the present study is to investigate the effectiveness and the selectivity of different reagents for metal extraction from target geochemical fraction. It is based on solid analyses with the use of X-ray diffraction and a scanning electron microscopy (SEM) coupled to a microRaman spectrometer in conjunction with chemical analyses of extracting solutions at each step. This methodology provides the opportunity to assess more accurately the effect of each reagent. The study focuses on extraction of Cu and Zn from sediment samples collected at two sites from river banks and characterized by presence of Quartz, Feldspar K, Micas, Kaolinite but with differences regarding accessory phases (pyrite, organic matter, iron oxy- hydroxide, calcite). The interaction of the samples with eight different reagents was assessed and compared (Ca(NO3)2 and CaCl2 for the exchangeable fraction; buffered solutions of sodium acetate/acetic acid at pH = 5.5 and pH = 5 for the acido-soluble fraction; hydroxylamine hydrochloride and a solution of ammonium oxalate/oxalic acid for reducible fraction; hydrogen peroxide and sodium hypochlorite for the oxidizable fraction. In-depth characterization of solid residue at each step allowed proposing the best protocol for both metals. Anderson, P., Davidson, C. M., Duncan, A. L., Littlejohn, D., Ure, A. M., and Garden, L. M. (2000). Column leaching and sorption experiments to assess the mobility of potentially toxic elements in industrially contaminated land. Journal of Environmental Monitoring, 2. Arey, J. S., Seaman, J. C., and Bertsch, P. M. (1999). Immobilization of uranium in contaminated sediments by hydroxyapatite addition. Environmental Science & Technology, 33, 337-342. Brannon, J. M., and Patrick, W. H. (1987). Fixation, transformation, and mobilization of arsenic in sediments.Environmental Science & Technology, 21, 450-459. Cornu, S., and Clozel, B. (2000). Extractions

  20. 25. Photographic copy of photograph (Source: Department of Interior. Bureau ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Photographic copy of photograph (Source: Department of Interior. Bureau of Reclamation. Bitter Root Project History 1931-1962. National Archives, Denver, RG 115, Accession #115-90-039, Box 243. Location of original photo unknown.) View of original construction of Como Dam during 1908 to 1910 - Bitter Root Irrigation Project, Como Dam, West of U.S. Highway 93, Darby, Ravalli County, MT

  1. Resultados del Estudio Nacional de Colografía de Tomografía

    Cancer.gov

    Estudios anteriores encontraron que la colografía de tomografía computarizada, también conocida como colonoscopia virtual, era prometedora como método de examen selectivo de detección de cáncer colorrectal debido

  2. Helenistic Encomium: A Reflection on Comics and Rhetoric

    ERIC Educational Resources Information Center

    Helms, Jason

    2009-01-01

    This video reflection starts in a presentation on comics at the Thomas R. Watson Conference last October, which prompted the author to explore the etymology of cosmos and comos through an alternate reading of Gorgias' "Encomium of Helen". The author then works with comos, as revelry, to offer thoughts on comics as a form of multimodal composition…

  3. Aflatoxinas

    Cancer.gov

    Las aflatoxinas son un tipo de toxinas producidas por ciertos hongos en cultivos agrícolas como el maíz, los cacahuates o el maní, la semilla de algodón y los frutos secos (de cáscara dura como las nueces).

  4. Asociación de XMRV con enfermedades humanas se debe a contaminación

    Cancer.gov

    Nuevas investigaciones muestran que una asociación, mencionada en numerosos estudios, entre el retrovirus conocido como XMRV y el cáncer de próstata así como el síndrome de fatiga crónica, se debe a contaminación de laboratorio con un virus que se originó en ratones.

  5. Delirio (PDQ®)—Versión para profesionales de salud

    Cancer.gov

    Resumen de información revisada por expertos acerca del delirio como una complicación a causa del cáncer o su tratamiento. Se discuten los enfoques de los cuidados médicos de apoyo, asi como farmacológicos para el manejo del delirio.

  6. Detective científica

    NASA Video Gallery

    La NASA posee muchos detectives que buscan pistas para resolver un misterio como la "detective científica" Monsi Roman. Se asegura de que el agua y el aire a bordo de la Estación Espacial Internaci...

  7. Neoplasias mieloproliferativas y síndromes mielodisplásicos—Versión para profesionales de salud

    Cancer.gov

    Información del Instituto Nacional del Cáncer para profesionales de salud sobre el tratamiento de las neoplasias mieloproliferativas, así como referencias a estudios clínicos y otros temas relacionados.

  8. Atom optics and space physics: A summary of an 'Enrico Fermi' summer school

    NASA Astrophysics Data System (ADS)

    Arimondo, Ennio; Ertmer, Wolfgang; Rasel, Ernst M.; Schleich, Wolfgang P.

    2008-03-01

    We describe the scientific content of the International School of Physics 'Enrico Fermi' on atom optics and space physics, organized by the Italian Physical Society in Varenna at Lake Como, Italy, 2-13 July 2007.

  9. Encontrando planetas alrededor de otras estrellas

    NASA Video Gallery

    Así como la Tierra gira alrededor del Sol, la estrella más cercana, es posible que otros planetas orbiten las estrellas que se ven en el cielo nocturno. Piensa en todos los planetas del universo qu...

  10. Tumores carcinoides gastrointestinales—Versión para profesionales de salud

    Cancer.gov

    Información del Instituto Nacional del Cáncer para profesionales de salud sobre el tratamiento del tumor carcinoide gastrointestinal, así como referencias a estudios clínicos y otros temas relacionados.