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Search Results: 1 - 10 of 5020 matches for " Fucks Gabriela "
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Globulina ligadora dos horm nios sexuais e proteína ligadora 1 do IGF-1: marcadores para resistência à insulina na pubarca precoce?
Teixeira Rosimere J.,Ginzbarg Denise,Freitas Josele R.,Fucks Gabriela
Arquivos Brasileiros de Endocrinologia & Metabologia , 2003,
Abstract: A hiperinsulinemia parece contribuir para o hiperandrogenismo por reduzir os níveis séricos tanto da SHBG quanto da IGFBP-1. Avaliamos os níveis de SHBG e IGFBP-1 e sua correla o com androgênios e insulina em 44 meninas selecionadas com pubarca precoce (PP) e 18 controles (C) pré-puberais (7,3±1,3 x 6,8±1,6 anos). Foram avaliados: o índice de massa corporal (IMC), a idade óssea (IO) e os níveis séricos de SHBG, IGFBP-1, insulina (I), glicose (G), testosterona (T), androstenediona (A), SDHEA e cortisol (F). Calculamos a rela o glicose: insulina (G/I) no jejum como índice de resistência à insulina (RI). A IO foi maior na PP, mas o IMC foi semelhante aos C. Os níveis de SDHEA, T e A foram maiores, enquanto a SHBG e a IGFBP-1 foram menores na PP do que nos C. Na regress o simples, a SHBG mostrou correla o com IMC, F, SDHEA, T, I, G/I e IGFBP-1, enquanto a IGFBP-1 se correlacionou com IMC, I e a G/I. No modelo de regress o múltipla, tanto a SHBG quanto a IGFBP-1 correlacionaram-se apenas com o IMC e a taxa G/I (r2=0,45; p<0,01 e r2=0,44; p<0,01, respectivamente). Nossos dados demonstram que o peso corporal e a insulina têm um papel sinérgico na regula o dos níveis da SHBG e da IGFBP-1, sugerindo que ambos podem ser marcadores sutis da RI na PP.
Globulina ligadora dos horm?nios sexuais e proteína ligadora 1 do IGF-1: marcadores para resistência à insulina na pubarca precoce?
Teixeira, Rosimere J.;Ginzbarg, Denise;Freitas, Josele R.;Fucks, Gabriela;Silva, Cristiane M.;Bordallo, Maria Alice N.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2003, DOI: 10.1590/S0004-27302003000300010
Abstract: hyperinsulinemia may contribute to hyperandrogenism because it reduces the levels of shbg and igfbp-1. in this study we determined serum levels of shbg and igfbp-1 and their association with androgen and insulin in 44 selected girls with premature pubarche (pp) and 18 pre-pubertal controls (c) (7.3±1.3 x 6.8±1.6years). the body mass index (bmi) and bone age (ba) were determined, as well as the serum levels of shbg, igfbp-1, insulin (i), glucose (g), testosterone (t), dheas, androstenedione (a), 17-hydroxyprogesterone (17ohp) and cortisol (f). fasting glucose to insulin ratio (g/i) was calculated as an index of insulin resistance (ir). ba was higher in pp than in c, but bmi was similar in both groups. serum levels of dheas, t and a were higher in pp than in c, whereas shbg and igfbp-1 were lower. shbg was correlated with bmi, sdhea, t, f, i, g/i and igfbp-1; and igfbp-1 was correlated with bmi, i and g/i ratio. in the multiple regression model, shbg and igfbp-1 were correlated only with bmi and g/i ratio (r2=0.45; p<0.01 and r2=0.44; p<0.01, respectively). the present data demonstrate that body weight and insulin have a synergic role in the regulation of serum shbg and igfbp-1 levels, suggesting that both could be tenuous markers of ir in pp.
Depósitos continentales cuaternarios en el noroeste de la provincia de Buenos Aires Quaternary continental deposits in the northeast Buenos Aires province
Enrique Fucks,Cecilia M. Deschamps
Revista de la Asociación Geológica Argentina , 2008,
Abstract: Se describen las características litológicas y paleontológicas de las unidades continentales de este sector de la región pampeana. Estas características sugieren que los procesos continentales (fluviales, eólicos y meteorización) y litorales son los que han tenido mayor influencia en el desarrollo de las diferentes geoformas, unidades litológicas y componentes fosilíferos. Las unidades de génesis continental de mayor desarrollo y distribución comprenden al loess y los limos loessoides agrupados como Formación Pampeano. Esta unidad, depositada esencialmente por acción eólica, ha sido retrabajada en algunos casos por el agua y procesos gravitacionales, y afectada por procesos de meteorización, e involucra también facies fluviales y lacustres. La homogeneidad observable en los depósitos ha provocado que frecuentemente su discriminación se basara en aspectos no puramente litológicos, siendo arbitraria y dificultando las posibilidades de efectuar correlaciones con otros afloramientos, debido a la discontinuidad horizontal y escaso espesor aflorante. Por esta situación, se considera que la denominación de Formación Pampeano al conjunto de los sedimentos refleja de manera más adecuada las características de la unidad. Se describen asimismo otras unidades aflorantes en el área, como la Formación La Postrera, los depósitos encauzados de la Formación Luján y el aluvio actual, los geosuelos Puesto Callejón Viejo y La Pelada, y las unidades mixtas o litorales correspondientes a las Formaciones Pilar y Campana. Geological and paleontological features of the continental units cropping out at this area of the Pampean region are described. These features suggest that the continental (fluvial, eolian and weathering) processes have had a major influence in the development of the different geoforms, lithological units, and fossil components. The continental deposits mostly developed and widely distributed in the area are those composed of loess and loessoid silts grouped as the Pampeano Formation. This mainly eolian unit, has been reworked in some cases by water and gravitational processes, and affected by weathering, and also involves fluvial and lacustrine facies. Because of its homogeneity, its differentiation has been often based on non-lithological aspects, being arbitrary, and making difficult the correlation with other exposures, especially regarding its horizontal discontinuity, and when little thickness is exposed. Consequently, it is considered that the name of Pampeano Formation for all these sediments is more appropriate to reflect the characteristics of the u
Análisis de las nomenclaturas y de los esquemas estratigráficos del Pleistoceno tardío-Holoceno en la cuenca del río Luján, Buenos Aires, Argentina
Blasi,Adriana; Prieto,Aldo R.; Fucks,Enrique; Figini,Aníbal;
Ameghiniana , 2009,
Abstract: the sedimentary deposits exposed in cutbanks along the luján river are considered to be the late quaternary type locality for geological and paleontological studies of the northeastern pampas of argentina. the stratigraphic nomenclatures and sequences proposed for over a century have been used to correlate with sedimentary successions from other regions of argentina, north of uruguay and south of brazil. this long history abounds in mistakes and misinterpretations, and the result is evident in the current stratigraphic nomenclature 'chaos'. in order to understand the stratigraphic meaning and the geochronological placement of the units referring to the late pleistocene-holocene period, a critical historical study of the antecedents was carried out, evaluating the meaning of the terms assigned to the different units. the information is organized into three periods: 1847-1920, 1920-1960, and 1995-2005. a geochronometric scale that sets the temporal frame for the continental and marine deposits known as lujanense, platense and querandinense in its type-locality was made. the validity of some of the terms currently in use was analyzed, and the following was proposed: (1) to leave behind the both formal and informal stratigraphic terms in use for the area, (2) to define stratigraphic schemes through the description of depositional units limited by unconformities, their lithofacies and facies differences (3) to carry out numerical dating and, (4) to avoid the creation of stratigraphical nomenclatures that are not in accordance with the current normatives.
Geocronología, paleoambientes y paleosuelos holocenos en la región pampeana Holocene geochronology, paleoenvironments and paleosoils in the Pampean region
E. Fucks,R. Huarte,J. Carbonari,A. Figini
Revista de la Asociación Geológica Argentina , 2007,
Abstract: Las condiciones paleoambientales de la región pampeana durante el Holoceno, generaron diferentes superficies de estabilización del paisaje, permitiendo la formación de suelos tanto en ambientes de la llanura marina costera como en ambientes continentales. El análisis de diferentes perfiles geológicos en cuatro localidades y sus áreas de influencia en el NE y E de la provincia de Buenos Aires, permitieron identificar eventos pedogenéticos ubicados entre circa 4.500 a os AP - 3.500 a os 14C AP y circa 1.700 a os 14C AP, en ambientes de la llanura marina costera y eventos pedogenéticos en planicies de inundación, ubicados cronológicamente con posterioridad a los circa 8.500- 8.000 a os 14C AP, finalizando 2.000 a os 14C AP. La cronología radiocarbónica permitió también: 1) ubicar cronológicamente el tope de la depositación del Miembro Guerrero de la Formación Luján dentro del Holoceno temprano (circa 8.500 a os 14C AP); 2) ubicar el lapso máximo de depositación del sedimento denominado aluvio actual, desde el Holoceno tardío (circa 2.500 a os 14C AP) hasta los depósitos actuales donde se desarrolla un suelo muy incipiente; 3) datar eventos pedogenéticos dentro del aluvio actual en circa 1.700 a os 14C AP; 4) estimar el retiro del máximo transgresivo del Holoceno y el comienzo de condiciones fluviales (circa 4.500 - 4.200 a os 14C AP). The palaeoenvironmental conditions in the Pampean region during the Holocene, generated different surfaces of landscape stabilization, making possible the formation of soils in coastal marine plains and continental environments. The analyses of different geological profiles in four localities and areas of influence (NE and E of Buenos Aires province), permitted to identify pedogenetic events: 1) in coastal marine plain environments, located among circa 4500 - 3500 14C years BP and circa 1700 14C years BP; 2) in flood plains, located chronologically later to circa 8500 - 8000 14C years BP, finalizing circa 2000 14C years BP. Besides, the radiocarbon chronology permitted: 1) to locate the end of the depositation of the Guerrero Member of the Luján Formation inside the early Holocene, circa 8500 14C years BP; 2) to establish the age of the beginning of depositation of the Recent alluvial sediments, circa 2500 14C years BP ; 3) to date a pedogenetic event into the Recent alluvial, circa 1700 14C years BP; 4) to estimate the retreat of the Holocene transgressive maximum and the beginning of fluvial conditions, circa 4500 - 4200 14C years BP.
Nuevo ordenamiento estratigráfico de las secuencias marinas del sector continental de la Bahía Samborombón, provincia de Buenos Aires New stratigraphic order for the marine sequences of the continental sector from Bahia Samboronbóm, Buenos Aires province
Enrique E. Fucks,Enrique J. Schnack,Marina L. Aguirre
Revista de la Asociación Geológica Argentina , 2010,
Abstract: Este estudio refleja las características geológicas-geomorfológicas de dos eventos transgresivo-regresivos acontecidos en el Pleistoceno tardío y Holoceno en el sector terminal de las cuencas de drenaje de los ríos Salado y Samborombón, este de la Provincia de Buenos Aires. Las variaciones del nivel del mar y un ambiente de costa baja, limitada hacia el norte y oeste por sectores positivos, han generado depósitos con unidades sedimentarias claramente individualizadas, proporcionando los elementos necesarios para establecer la evolución estratigráfica y geomorfológica del sector. Si bien esta región ha sido estudiada desde diversas disciplinas, la amplia y confusa nomenclatura existente determina la necesidad de denominar, agrupar y redefinir el conjunto de las unidades litológicas involucradas, a fin de establecer un marco estratigráfico y su relación con la evolución geomorfológica del área. En este sentido, a la ingresión del Pleistoceno tardío se la denomina Formación Puente de Pascua y a todos los depósitos de la ingresión postglacial se los involucra dentro de la Formación Canal de las Escobas, en la que se incluyen cuatro miembros: Destacamento Río Salado, Canal 18, Cerro de la Gloria y Canal 15. Esta nueva organización estratigráfica incluye criterios sedimentológicos y paleoecológicos y su asociación con la evolución geomorfológica de la región, discriminando ambientes de planicie de marea, lagunas costeras y cordones litorales. This study focuses on the relationships of the last two transgressive-regressive cycles that occurred in the Late Pleistocene and Holocene, and the lithological and geomorphologic developments on a terminal sector of the Salado-Samborombón river basins. Sealevel variations on a low-lying coast bordered by a higher terrain permitted the deposition of several sedimentary units, some of them preserving the morphology. Although this region has been broadly studied and because of the diverse existing nomenclature, it is necessary to designate and redefine the lithological units in order to establish a stratigraphic framework and its relationship with the geomorphic evolution of the area. Therefore, it is proposed to designate the Late Pleistocene transgressive maximum (MIS 5e) as Puente de Pascua Formation and the postglacial transgressive maximum as Canal de las Escobas Formation, with four members: Destacamento Río Salado, Canal 18, Cerro de la Gloria and Canal 15. This new stratigraphic organization includes sedimentological and palaeoecological criteria and their association with the regional morphological development.
Evolución geológica-geomorfológica de la cuenca del río Areco, NE de la provincia de Buenos Aires
Enrique Fucks,Adriana Blasi,Jorge Carbonari,Roberto Huarte
Revista de la Asociación Geológica Argentina , 2011,
Abstract: La cuenca del río Areco integra la red de drenaje de la Pampa Ondulada, NE de la provincia de Buenos Aires. Los procesos geomórficos marinos, fluvio-lacustres y eólicos actuaron sobre los sedimentos loéssicos y loessoides de la Formación Pampeano (Pleistoceno) dejando, con diferentes grados de desarrollo, el registro sedimentario del Pleistoceno tardío y Holoceno a lo largo de toda la cuenca. En estos depósitos se han reconocido, al menos, dos episodios pedogenéticos. Edades 14C sobre MO de estos paleosuelos arrojaron valores de 7.000 ± 240 y 1.940 ± 80 a os AP en San Antonio de Areco y 2.320 ± 90 y 2.000 ± 90 a os AP en Puente Castex, para dos importantes estabilizaciones del paisaje, separadas en esta última localidad por un breve episodio de sedimentación. La cuenca inferior en la ca ada Honda, fue ocupada por la ingresión durante MIS 1 (Formación Campana), dejando un amplio paleoestuario limitado por acantilados. El retroceso de la línea de costa y la conti-nentalización del ambiente permitió la formación de un suelo datado en 3.070 ± 90 a os 14C AP cubierto por sedimentos aluviales. Los sedimentos litorales son en general de baja energía, asociados a tres litofacies diferentes, cuyas edades fluctúan entre los 4.270 ± 70 a os 14C AP en esta cuenca y 6.000 ± 80 14C a os AP, 6.370 ± 90 a os 14C AP, 3.640 ± 70 a os 14C AP, 5.630 ± 100 a os 14C AP y 5.420 ± 110 a os 14C AP, en cuencas aleda as. La ingresión durante MIS 5e también entró por el río Areco evidenciando ya la existencia de esta depresión. El límite externo de esta cuenca lo constituye el delta del Paraná cuya progradación ha dejado expuesto morfologías y depósitos de ambientes fluviales, observándose que el contacto entre ambas unidades morfológicas (delta y paleoestuario) está determinado por los cursos de agua, que con cambio bruscos de dirección, acompa an el sentido de avance del complejo deltaico. The Areco River Basin is part of the drainage system of Pampa Ondulada region, NE Buenos Aires Province. Geomorphic processes that it formed, acted on the loessoid sediments of the Pampeano Formation (Pleistocene) building a morphology contrasting with those of the surrounding environment. In the upper and middle basin there are fluvial successions (Late Pleistocene-Holocene) with different development of pedogenesis. 14C on OM of these paleosoils yielded 7,000 ± 240 and 1,940 ± 80 years BP in San Antonio de Areco, and 2,320 ± 90 and 2,000 ± 90 years 14C BP in Castex Bridge, for two important landscape stabilizations, separated in the latter place for a brief episode of sedimentation. The lowe
A free boundary problem describing the saturated-unsaturated flow in a porous medium. Part II. Existence of the free boundary in the 3D case
Gabriela Marinoschi
Abstract and Applied Analysis , 2005, DOI: 10.1155/aaa.2005.813
Abstract: We present an extension of the results given in the first part ofthis paper (2004) referring to the existence in the 3D case ofa free boundary between the saturated and unsaturated domains thatmay be evidenced during the water flow into a porous medium.
A free boundary problem describing the saturated-unsaturated flow in a porous medium
Gabriela Marinoschi
Abstract and Applied Analysis , 2004, DOI: 10.1155/s1085337504311127
Abstract: This paper presents a functional approach to a nonlinear model describing the complete physical process of water infiltration into an unsaturated soil, including the saturation occurrence and the advance of the wetting front. The model introduced in this paper involves a multivalued operator covering the simultaneous saturated and unsaturated flow behaviors and enhances the study of the displacement of the free boundary between these two flow regimes. The model resides in Richards' equation written in pressure form with an initial condition and boundary conditions which in this work express the inflow due to the rain on the soil surface on the one hand, and characterize a certain permeability corresponding to the underground boundary, on the other hand. Existence, uniqueness, and regularity results for the transformed model in diffusive form, that is, for the moisture of the soil, and the existence of the weak solution for the pressure form are proved in the 3D case. The main part of the paper focuses on the existence of the free boundary between the saturated and unsaturated parts of the soil, and this is proved, in the 1D case, for certain stronger assumptions on the initial data and boundary conditions.
Kernel convergence and biholomorphic mappings in several complex variables
Gabriela Kohr
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203303321
Abstract: We deal with kernel convergence of domains in ℂn which are biholomorphically equivalent to the unit ball B. We also prove that there is an equivalence between the convergence on compact sets of biholomorphic mappings on B, which satisfy a growth theorem, and the kernel convergence. Moreover, we obtain certain consequences of this equivalence in the study of Loewner chains and of starlike and convex mappings on B.
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