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Search Results: 1 - 10 of 540657 matches for " Emeris López-M "
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Osmolalidad de bebidas de consumo frecuente
Dini-G,Elizabeth; De Abreu-C,Jorge; López-M,Emeris;
Investigación Clínica , 2004,
Abstract: the objective of this work was to determine the osmolality of beverages frequently consumed by children and adolescents due to the scarce information available in our country. the samples were grouped as follows: milks; refreshments; beverages based on fruits, vegetables, cereals, and tubers; sport drinks; energizing drinks; oral rehydrating solutions; reconstituted drinks and infusions. a vapor pressure digital osmometer was used, five samples of each beverage from different lots were analyzed. four osmolality determinations were made on each sample and the average of such values was calculated. when the variation coefficient of the osmolality measurements of the five samples was higher than 10%, five additional samples were analyzed. as many samples as possible were used with breast milk in the time period of the study. osmolality averages, standard deviation, and the osmolality confidence intervals (95% reliability) were calculated. the osmolality (mmol/kg) of breast milk and that of cow milk were between 273 and 389; refreshments, white, black and flavored colas, and malts ranged between 479-811; and soda and light drinks: 44-62; fresh fruit and commercial drinks (coconut, peach, apple, orange, pear, pineapple, grape, plum, tamarind): 257-1152 and light juices: 274; sports beverages: 367; energizing drinks: 740; drinks based on vegetables and cereals: 213-516; oral rehydrating solutions: 236-397; reconstituted drinks: 145; infusions: 25. beverages with adequate osmolality levels for children were: milks, light refreshments, soda, fresh and light juices, oral rehydrating, soy, and reconstituted drinks and infusions.
Osmolalidad de bebidas de consumo frecuente Osmolality of frequently consumed beverages
Elizabeth Dini-G,Jorge De Abreu-C,Emeris López-M
Investigación Clínica , 2004,
Abstract: Se determinó la osmolalidad de bebidas de consumo frecuente por los ni os y adolescentes debido a la escasa información existente en nuestro país. Las muestras se agruparon en leches, bebidas refrescantes, con base en frutas, hortalizas, cereales y tubérculos; deportivas, energéticas, soluciones de rehidratación oral, reconstituidas e infusiones. Se utilizó un osmómetro digital de presión de vapor, analizando cinco muestras de cada bebida, lotes diferentes. A cada muestra se le hicieron cuatro determinaciones de osmolalidad calculando el promedio de dichos valores. Cuando el coeficiente de variación de las medidas de osmolalidad de las cinco muestras fue superior a 10%, se analizaron 5 muestras adicionales. Con la leche materna se utilizaron las muestras que fueron posibles recolectar durante el estudio. Se calcularon promedios de osmolalidad, desviación estándar e intervalo de confianza de los valores de osmolalidad (95% confiabilidad). La osmolalidad (mmol/kg) de la leche materna y de vaca estuvieron entre 273 y 389; las bebidas refrescantes, colas blancas, negras, sabores y maltas oscilaron entre 479-811 y la soda y bebidas light: 44-62; bebidas de frutas naturales y comerciales (coco, durazno, manzana, naranja, pera, pi a, uva, ciruela, tamarindo): 257-1152 y los jugos light: 274; bebidas deportivas: 367; bebidas energéticas: 740; bebidas basadas en hortalizas y cereales: 213-516; soluciones de rehidratación oral: 236-397; bebidas reconstituidas: 145; infusiones: 25. Las bebidas con osmolalidad en rango adecuado para los ni os fueron: leches, refrescos light, soda, jugos naturales y light, bebidas de rehidratación oral, de soya, reconstituidas e infusiones. The objective of this work was to determine the osmolality of beverages frequently consumed by children and adolescents due to the scarce information available in our country. The samples were grouped as follows: milks; refreshments; beverages based on fruits, vegetables, cereals, and tubers; sport drinks; energizing drinks; oral rehydrating solutions; reconstituted drinks and infusions. A vapor pressure digital osmometer was used, five samples of each beverage from different lots were analyzed. Four osmolality determinations were made on each sample and the average of such values was calculated. When the variation coefficient of the osmolality measurements of the five samples was higher than 10%, five additional samples were analyzed. As many samples as possible were used with breast milk in the time period of the study. Osmolality averages, standard deviation, and the osmolality confidence inte
Structural Basis for the Aminoacid Composition of Proteins from Halophilic Archea
Xavier Tadeo,Blanca López-Méndez,Tamara Trigueros,Ana Laín,David Casta?o,Oscar Millet
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1000257
Abstract: Proteins from halophilic organisms, which live in extreme saline conditions, have evolved to remain folded at very high ionic strengths. The surfaces of halophilic proteins show a biased amino acid composition with a high prevalence of aspartic and glutamic acids, a low frequency of lysine, and a high occurrence of amino acids with a low hydrophobic character. Using extensive mutational studies on the protein surfaces, we show that it is possible to decrease the salt dependence of a typical halophilic protein to the level of a mesophilic form and engineer a protein from a mesophilic organism into an obligate halophilic form. NMR studies demonstrate complete preservation of the three-dimensional structure of extreme mutants and confirm that salt dependency is conferred exclusively by surface residues. In spite of the statistically established fact that most halophilic proteins are strongly acidic, analysis of a very large number of mutants showed that the effect of salt on protein stability is largely independent of the total protein charge. Conversely, we quantitatively demonstrate that halophilicity is directly related to a decrease in the accessible surface area.
Liver failure after an uncovered TIPS procedure associated with hepatic infarction
Eric López-Méndez, Daniel Zamora-Valdés, Mariana Díaz-Zamudio, Oscar F Fernández-Díaz, Lourdes ávila
World Journal of Hepatology , 2010,
Abstract: Transjugular intrahepatic portosystemic shunt (TIPS) is a safe and effective procedure for the treatment of complications of liver cirrhosis, such as refractory ascites, hepatic hydrothorax and refractory variceal bleeding. The aim of this paper is to describe a rare case of liver failure after a TIPS procedure. A 38-year-old diabetic male with Child-Pugh C liver cirrhosis due to chronic hepatitis C infection who had developed refractory ascites was scheduled for a TIPS procedure. Within 24 h following TIPS placement, the patient developed distributive shock, jaundice, persistentgrade 3 hepatic encephalopathy, severe coagulopathy and acute renal failure. He was treated with lactulose enemas, broad-spectrum antibiotics and blood-derived products. Laboratory data revealed a 100-fold increase in aminotransferases and a non-enhanced computed tomography showed an irregular hypodense area in the right posterior segment of the liver. Despite being initially being in a stable condition, the patient developed progressive liver failure and died 2 mo later. Hepatic infarction is an uncommon phenomenon after a TIPS procedure; however, it can greatly complicate the course of a disease in a patient with an already compromised liver function.
Structural Basis for the Aminoacid Composition of Proteins from Halophilic Archea
Xavier Tadeo equal contributor,Blanca López-Méndez equal contributor,Tamara Trigueros,Ana Laín,David Casta?o,Oscar Millet
PLOS Biology , 2009, DOI: 10.1371/journal.pbio.1000257
Abstract: Proteins from halophilic organisms, which live in extreme saline conditions, have evolved to remain folded at very high ionic strengths. The surfaces of halophilic proteins show a biased amino acid composition with a high prevalence of aspartic and glutamic acids, a low frequency of lysine, and a high occurrence of amino acids with a low hydrophobic character. Using extensive mutational studies on the protein surfaces, we show that it is possible to decrease the salt dependence of a typical halophilic protein to the level of a mesophilic form and engineer a protein from a mesophilic organism into an obligate halophilic form. NMR studies demonstrate complete preservation of the three-dimensional structure of extreme mutants and confirm that salt dependency is conferred exclusively by surface residues. In spite of the statistically established fact that most halophilic proteins are strongly acidic, analysis of a very large number of mutants showed that the effect of salt on protein stability is largely independent of the total protein charge. Conversely, we quantitatively demonstrate that halophilicity is directly related to a decrease in the accessible surface area.
Osmolalidad de productos y fórmulas para la terapia nutricional
De Abreu,Jorge; López,Emeris; Dini,Elizabeth;
Investigación Clínica , 2009,
Abstract: the objective was to determine the osmolality of products and formulas for nutritional therapy available in venezuela. the samples were grouped as follows: infant formulas, premature infant, follow up, 1 to 4 years, soy based, lactose free, anti-reflux, hypoallergenic, complete beverages, polymeric formulas, semi-elemental, caloric and protein modules. a vapor pressure digital osmometer was used, analyzing five samples of each product from different lots, prepared by weigth or with scoop. when the variation coefficient of the osmolality measurements was higher than 10%, five additional samples were analyzed. averages, standard deviation, and the variation coefficient of the osmolality measures (95% reliability) were calculated. the osmolality (mmol/kg) of infant and premature infant formulas were between 258 and 309; follow up formulas ranged between 256-390; 1 to 4 years: 343-399; soy based: 155-252; lactose free: 163-248; anti-reflux: 230-292; hypoallergenic: 220-335; complete beverages: 205-454; polymeric formulas: 247-588; semi-elemental: 238-289; caloric module: 89-99 and protein module: 30-60. we found that almost all the formulas prepared with scoop had higher osmolality and variability than the same products prepared by weight. some follow up, polymeric, 1 to 4 years formulas and complete beverages had high osmolalities and therefore should not be administered to infants, and must be administered with caution to children and adolescents when the gastrointestinal tract is compromised.
Osmolalidad de productos y fórmulas para la terapia nutricional Osmolality of products and formulas for nutritional therapy
Jorge De Abreu,Emeris López,Elizabeth Dini
Investigación Clínica , 2009,
Abstract: Se determinó la osmolalidad de fórmulas y productos para la terapia nutricional disponibles en Venezuela. Las muestras se agruparon en fórmulas infantiles de inicio, neonatos de bajo peso, infantiles de continuación, 1 a 4 a os, a base de soya, sin lactosa, antirreflujo, hipoalergénicas, dietas con nutrientes intactos basadas en leche (DNIBL), fórmulas poliméricas, semielementales, módulos calóricos y proteicos. Se utilizó un osmómetro digital de presión de vapor, analizando cinco muestras por producto, preparadas por medida y por peso, de lotes diferentes. Cuando el coeficiente de variación de las medidas de osmolalidad fue mayor a 10%, se analizaron 5 muestras adicionales. Se calcularon promedios, desviación estándar y coeficiente de variación de los valores de osmolalidad (95% confiabilidad). La osmolalidad (mmol/kg) de las fórmulas de inicio y de neonatos de bajo peso estuvieron entre 258 y 309; las de continuación: 256-390; de ni os de 1 a 4 a os: 343-399; a base de soya: 155-252; sin lactosa: 163-248; antirreflujo: 230-292; hipoalergénica: 220-335; DNIBL: 205-454; poliméricas: 247-588; semielementales: 238-289; módulo calórico: 89-99; y proteico: 30-60. Se encontró que generalmente las fórmulas preparadas con medidor tenían mayor osmolalidad y variabilidad que las preparadas según el peso. Algunas fórmulas de continuación, poliméricas, fórmulas para ni os de 1 a 4 a os y con nutrientes intactos basadas en leche tuvieron osmolalidades elevadas por lo que no deben ser administradas a lactantes, y con precaución a ni os y adolescentes cuando el tracto gastrointestinal esté comprometido. The objective was to determine the osmolality of products and formulas for nutritional therapy available in Venezuela. The samples were grouped as follows: infant formulas, premature infant, follow up, 1 to 4 years, soy based, lactose free, anti-reflux, hypoallergenic, complete beverages, polymeric formulas, semi-elemental, caloric and protein modules. A vapor pressure digital osmometer was used, analyzing five samples of each product from different lots, prepared by weigth or with scoop. When the variation coefficient of the osmolality measurements was higher than 10%, five additional samples were analyzed. Averages, standard deviation, and the variation coefficient of the osmolality measures (95% reliability) were calculated. The osmolality (mmol/kg) of infant and premature infant formulas were between 258 and 309; follow up formulas ranged between 256-390; 1 to 4 years: 343-399; soy based: 155-252; lactose free: 163-248; anti-reflux: 230-292; hypoallergenic: 220-33
Diversidad y actividad procariótica en ecosistemas marinos
A. López López,M. Zaballos
Ecosistemas , 2005,
Abstract:
Atomic Force Microscopy Studies on GaAs/In Bilayers Deposited on Si (100)  [PDF]
Miguel ángel Venegas, Roberto Bernal- Correa, Máximo López- López, álvaro Pulzara- Mora
Microscopy Research (MR) , 2015, DOI: 10.4236/mr.2015.31002
Abstract: GaAs/In bilayers were prepared by RF Magnetron Sputtering in an Ar atmosphere on Si (100) substrates using high purity (95.95%) GaAs (100) and In targets. The growth temperatures were 300oC and 580oC for the high purity targets of In and GaAs, respectively. Three samples were prepared: the deposition time (td) for the GaAs layers was fixed to 30 minutes, while varied for the In layers from td = 10, 15, and 20 minutes. The morphological and optical studies of the samples were made by means of Amplitude Modulation Atomic Force Microscopy (AM-AFM). In order to analyze and correlate surface morphology and alloy composition properties, the as-prepared samples were cleaved along the [001] direction and subsequently studied by AM-AFM-micrographs. From topographic images, a statistical study of the roughness and grain size was made. Additionally, cross sectional AM-AFM-micrographs were performed for each sample, where the phase channel, which is sensitive to the material properties of the specimen, was of particular interest.
Meningoencefalitis chagásica en un paciente con infección por VIH/SIDA con sobrevida a tres a?os: Caso clínico
López M,Olga;
Revista chilena de infectología , 2010, DOI: 10.4067/S0716-10182010000200012
Abstract: immunocompromised patients as those with renal transplant, hematological neoplasia or cáncer and hiv/aids infection can suffer acute reactivation of chagas disease. central nervous system (cns) evolvement (cerebral tumor or chagoma and diffuse meningoencephalitis) is similar to other opportunistic infections that present with cerebral expansive processes like toxoplasmosis or cns primary lymphoma. survival is infrequent, depending on antiparasitic therapy and early starting antiretroviral therapy. the case of an hiv/aids positive patient that evolved with a chagasic meningoencephalitis and improved after beginning early antiparasitic therapy and antiretroviral therapy antirretroviral is described.
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