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Search Results: 1 - 10 of 596236 matches for " María L. Cariaga "
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Un esquema de estimación de la precipitación estival en la ciudad de Buenos Aires
Cariaga,María L.; González,Marcela H.;
Meteorologica , 2010,
Abstract: the aim of this study is to estimate december to february rainfall in buenos aires city and its surroundings, using atmospheric variables. summer rainfall in buenos aires was correlated with sea surface temperature, 1000 hpa, 500 hpa and 200 hpa geopotential heights, sea surface pressure, 850 hpa zonal and meridional and specific humidity from the ground to 700 hpa, observed in the previous month. some predictors were selected based on the statistical significance, the independence and the physical meaning and they were used as entrance variables to generate a multiple linear regression using the"forward stepwise" method. the selected predictors were: 1000 hpa geopotential height in the atlantic ocean coast, near 25os and zonal wind in central south america near 15os. therefore the final model showed that summer rainfall is mainly influenced by the weakening of the atlantic anticyclone and the moist air advection from the north. the verification was done for 1984-2007 period and the correlation between the observed and estimated rainfall was 0.61. the stability of the model was proved using a crossvalidation methodology. the results were encouraging and indicate the existence of certain rainfall predictability in summer for buenos aires area.
Un esquema de estimación de la precipitación estival en la ciudad de Buenos Aires An estimate scheme of the summer precipitation in the city of Buenos Aires
María L. Cariaga,Marcela H. González
Meteorologica , 2010,
Abstract: El objetivo del trabajo es estimar la precipitación estival en la ciudad y Gran Buenos Aires. Para ello fue correlacionada con los campos de temperatura de la superficie del mar, las alturas geopotenciales en 1000 hPa, 500 hPa y 200 hPa, la presión a nivel del mar, viento en 850 hPa y humedad específica en niveles bajos en el mes previo. Predictores fueron seleccionados basándose en la significancia estadística, la independencia y la explicación física de su relación y utilizados como variables de entrada para generar una regresión lineal múltiple con el método "forward stepwise". Ellos son la altura geopotencial de 1000 hPa sobre la costa del océano Atlántico alrededor de 25oS y el viento zonal en el centro de América del Sur. La lluvia estival depende principalmente del debilitamiento del anticiclón del Atlántico y de la advección de aire húmedo desde el norte del país. La verificación se realizó para los datos del período 1984-2007 obteniendo una correlación entre la serie observada y estimada de 0.61. La estabilidad del modelo se probó con la metodología de la crossvalidación. Los resultados indican la existencia de predictabilidad para la precipitación estival para el área de Buenos Aires. The aim of this study is to estimate December to February rainfall in Buenos Aires city and its surroundings, using atmospheric variables. Summer rainfall in Buenos Aires was correlated with sea surface temperature, 1000 hPa, 500 hPa and 200 hPa geopotential heights, sea surface pressure, 850 hPa zonal and meridional and specific humidity from the ground to 700 hPa, observed in the previous month. Some predictors were selected based on the statistical significance, the independence and the physical meaning and they were used as entrance variables to generate a multiple linear regression using the"forward stepwise" method. The selected predictors were: 1000 hPa geopotential height in the Atlantic Ocean coast, near 25oS and zonal wind in central South America near 15oS. Therefore the final model showed that summer rainfall is mainly influenced by the weakening of the Atlantic Anticyclone and the moist air advection from the north. The verification was done for 1984-2007 period and the correlation between the observed and estimated rainfall was 0.61. The stability of the model was proved using a crossvalidation methodology. The results were encouraging and indicate the existence of certain rainfall predictability in Summer for Buenos Aires area.
Some Factors That Influence Seasonal Precipitation in Argentinean Chaco
Marcela Hebe González,María Laura Cariaga,María de los Milagros Skansi
Advances in Meteorology , 2012, DOI: 10.1155/2012/359164
Abstract: The Chaco plain region in Argentina is located in the north of the country and east of Los Andes where the main activity is the agriculture. As such activity is highly affected by interannual rainfall variability, the influence of some of the principal atmospheric and oceanic forcing is investigated in this paper. Results show that the factors which affect precipitation highly depend on the season and the subregion. The position of the South Atlantic Height and the sea surface temperature in the coast of southern Brazil and Buenos Aires seem to be the factors that affect rainfall, all over the year. The El Niño-Southern Oscillation phenomenon affects summer and spring rainfall and the Southern Annular Mode involves spring precipitation but both only in the east of the study region. Furthermore, enhanced convection in Central Brazil, mainly influences autumn and spring rainfall.
Some Factors That Influence Seasonal Precipitation in Argentinean Chaco
Marcela Hebe González,María Laura Cariaga,María de los Milagros Skansi
Advances in Meteorology , 2012, DOI: 10.1155/2012/359164
Abstract: The Chaco plain region in Argentina is located in the north of the country and east of Los Andes where the main activity is the agriculture. As such activity is highly affected by interannual rainfall variability, the influence of some of the principal atmospheric and oceanic forcing is investigated in this paper. Results show that the factors which affect precipitation highly depend on the season and the subregion. The position of the South Atlantic Height and the sea surface temperature in the coast of southern Brazil and Buenos Aires seem to be the factors that affect rainfall, all over the year. The El Ni?o-Southern Oscillation phenomenon affects summer and spring rainfall and the Southern Annular Mode involves spring precipitation but both only in the east of the study region. Furthermore, enhanced convection in Central Brazil, mainly influences autumn and spring rainfall. 1. Introduction First of all, a description of the climate and relevant economic activities in the study area is detailed. Chaco plain region is located in the north of Argentina, eastward the Andes Mountain Range. This area comprises the ecosystems of dry Chaco in the west, wet Chaco in the east, and forest yungas, which are discontinuously scattered in Salta, Jujuy, and Tucumán provinces (Figure 1). The climate is subtropical with a mean annual rainfall cycle showing a minimum in winter, which is more pronounced in the west, with wet conditions prevailing from October to April [1–3]. The Andes chain lies along the west of Argentina and prevents the access of humidity from the Pacific Ocean north of 38°S, where the mountains are high. Therefore, winds prevail from the north and the east because the flow is governed by two factors: the South Atlantic Height and an intermittent thermal low-pressure system that is located between 20° and 30°S, in northwest Argentina, east of the Andes. This system is observed all year long, but it is deeper in summer than in winter [4]. When this low is present, northerly flow is favored at low levels over the subtropical region. The easterly low-level flow at low latitudes is channeled towards the south between the Bolivian Plateau and the Brazilian Planalto, advecting warm and humid air to southern Brazil, Paraguay, Uruguay, and subtropical Argentina and depicting a typical feature that many authors have studied [5–8]. Besides, intermittent eruptions of polar fronts from the south modify this scheme, causing a west or a southwest flow in low levels after the frontal passage. Figure 1: Stations used in the study. Stations refered to in Result
Estandarización de un método para la extracción de DNA a partir de muestras clínicas parafinadas
Tiscornia,María M; Cubilla,Marisa A; Lorenzati,María A; Cariaga Martínez,Ariel E; Zapata,Pedro D;
Revista de ciencia y tecnolog?-a , 2010,
Abstract: molecular epidemiology includes genotypic studies of different biological processes, including pathological diseases such as cancer. therefore, the paraffin-embedded clinical samples analysis is very important for diagnosis, prevention and therapy. previously, many problems associated with amplification of dna obtained from paraffin-embedded tissue samples were reported. this paper compares the capability of nine methodologies for dna extraction from paraffin-embedded clinical samples, amplifying it by pcr to analyze under-250-bp fragments corresponding to folate pathway enzymes polymorphisms. modification of "salting-out" method with concentrations of 0.5 m nacl and 2 % ctab detergent and proteinase k was the most suitable for amplifiable dna obtention of selected amplicons. all methods showed better amplification with longer cycles and lower annealing temperatures as compared to less fragmented dna samples.
Estandarización de marcadores moleculares microsatélites para su uso en la industria forestal de Misiones, Argentina
Graciela Teza,Verónica; Fonseca,María Isabel; Walantus,Leonardo Horacio; Davalos,Paula; Toro,Alejandro Alberto; Cariaga-Martinez,Ariel Ernesto; Villalba,Laura Lidia; Zapata,Pedro Darío;
Revista Colombiana de Biotecnología , 2012,
Abstract: misiones province currently has the first intensive forestry activity of argentine. this framework of productive development allows predict an area of growth favored by the new conditions of the international market. on the other side despite the progress of industrial technology, has not been reached the optimal level of biotechnological development that combining quality with genomic and phenotypic characteristics of forest species. this work presents the results of federal project of productive innovation (pfip mi09) whose main objective was standardize and transfer to the productive sector a set of microsatellites molecular markers to be applied to the populations analysis of araucaria angustifolia and pinus taeda forestation from the misiones (argentine). this will reveal the plantations and forest genetic profile and may be applied to genetic certification of forest production quality.
An approach to seasonal forecasting of summer rainfall in Buenos Aires, Argentina
GONZáLEZ, M. H.;CARIAGA, M. L.;
Atmósfera , 2009,
Abstract: this paper analyzes some summer rainfall characteristics in buenos aires and developes a seasonal prediction scheme. buenos aires is located along the coast of the río de la plata in argentina. the outstanding rainfall feature is the presence of an annual cycle with maximum precipitation in summer. the analysis of the annual rainfall evolution since 1908 showed a positive trend of 2.1 mm/year and 1.8 mm/year for the period between december and february, representative of the summer season. the observatorio central buenos aires/station, located in the downtown, registered a mean annual accumulated rainfall of 1070 mm with a standard deviation of 239 mm, during the period 1908-2007. the mean accumulated precipitation during january, february and march was 305 mm with a standard deviation of 125 mm. the wet and dry periods were identified and the dry periods tended to be longer during 1908-1957 meanwhile wet periods resulted longer and more intense in 1958-2007. accumulated rainfall between december and february was related to some mean meteorological variables between september and november, with the aim to develop a statistical prediction scheme. careful selection of predictors, based largely on physical reasoning, was done and they were used in a regression model, following a forward stepwise methodology. the analysis shows that the most important source of predictability comes from the cyclonic activity in the atlantic ocean and the flow from brazilian forest. the observed and forecast rainfall series were significantly correlated (0.59) and nearly the 35% of summer rainfall variance was predicted by the proposed method. a semi-quantitative validation was done by using terciles of the observed and forecast distributions. the skill of the forecast got a good result although there is still an important portion of the variance that cannot be explained by this model and therefore, the method might be improved in future research.
Functional Plasticity in the Type IV Secretion System of Helicobacter pylori
Roberto M. Barrozo,Cara L. Cooke,Lori M. Hansen,Anna M. Lam,Jennifer A. Gaddy,Elizabeth M. Johnson,Taryn A. Cariaga,Giovanni Suarez,Richard M. Peek Jr,Timothy L. Cover,Jay V. Solnick
PLOS Pathogens , 2013, DOI: 10.1371/journal.ppat.1003189
Abstract: Helicobacter pylori causes clinical disease primarily in those individuals infected with a strain that carries the cytotoxin associated gene pathogenicity island (cagPAI). The cagPAI encodes a type IV secretion system (T4SS) that injects the CagA oncoprotein into epithelial cells and is required for induction of the pro-inflammatory cytokine, interleukin-8 (IL-8). CagY is an essential component of the H. pylori T4SS that has an unusual sequence structure, in which an extraordinary number of direct DNA repeats is predicted to cause rearrangements that invariably yield in-frame insertions or deletions. Here we demonstrate in murine and non-human primate models that immune-driven host selection of rearrangements in CagY is sufficient to cause gain or loss of function in the H. pylori T4SS. We propose that CagY functions as a sort of molecular switch or perhaps a rheostat that alters the function of the T4SS and “tunes” the host inflammatory response so as to maximize persistent infection.
Tumoral Prostate Shows Different Expression Pattern of Somatostatin Receptor 2 (SSTR2) and Phosphotyrosine Phosphatase SHP-1 (PTPN6) According to Tumor Progression
Ariel Ernesto Cariaga-Martinez,María Angelica Lorenzati,Mario Alejandro Riera,Marisa Angelica Cubilla,Andrés De La Rossa,Ernesto Martín Giorgio,María Mercedes Tiscornia,Esteban Mariano Gimenez,María Eugenia Rojas,Bárbara Julieta Chaneton,Dora Isabel Rodríguez,Pedro Darío Zapata
Advances in Urology , 2009, DOI: 10.1155/2009/723831
Abstract: Prostate proliferation is dependent of androgens and many peptide hormones. Recent reports suggest that SSTR2 and SHP-1 were two fundamental components on antiproliferative effect of somatostatin. Many studies on SHP-1 revealed that the expression of this protein was diminished or abolished in several of the cancer cell lines and tissues examined. However, it is necessary to confront the cell lines data with real situation in cancer cases. Our studies have shown that epithelial expressions of both proteins, SHP-1 and SSTR2, in normal and benign hyperplasia are localized in the luminal side of duct and acinar cells. Also, SSTR2 is expressed in stromal cells. In malignant prostate tissue, SHP-1 was diminished in 28/45 cases or absent in 12/45 cases, whereas SSTR2 epithelial was diminished in 38/45 cases or lost in only 2/45 cases. The intensity of immunostained was highly negative correlated with Gleason grade for two proteins.
Length-mass relationships for macroinvertebrates in freshwater environments of Patagonia (Argentina)
Miserendino,María L;
Ecolog?-a austral , 2001,
Abstract: mass-length equations were obtained for aquatic macroinvertebrates collected in different streams and rivers of patagonia, argentina. thirty six taxa were studied: plecoptera (10 species), ephemeroptera (3 species, 3 genera), trichoptera (4 species, 1 genus), diptera (6 genera), coleoptera (1 species, 1 genus) anisoptera (1 genus), crustacea (2 species), oligochaeta (1 genus, 1 family), gasteropoda (1 species) and turbellaria (1 genus). additional relationships were obtained at the order level for plecoptera, ephemeroptera, trichoptera and diptera. mass-length relationships were estimated by fitting the model y = axb linearized by logarithmic transformation) to data of dry mass vs. body length of preserved specimens. the regressions were highly significant and explained a high proportion of variation of the dependent variable, as expressed by the coefficient of determination (r2 = 0.58-0.98). the equations obtained allow the estimation of biomass of invertebrates in patagonian running waters from measurements of linear dimensions, facilitating calculations of benthic standing crop and of secondary production.
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