oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 316 )

2018 ( 522 )

2017 ( 545 )

2016 ( 781 )

Custom range...

Search Results: 1 - 10 of 331508 matches for " MARTA; DINAMARCA S "
All listed articles are free for downloading (OA Articles)
Page 1 /331508
Display every page Item
Pérdidas Proteicas Peritoneales en Ni os Portadores de Síndrome Nefrótico en Diálisis Peritoneal Peritoneal Protein Loss in Children Suffering from Nephrotic Syndrome Undergoing Peritoneal Dialysis
LILY QUIROZ Z,MARTA AZóCAR P,HéCTOR DINAMARCA S,MARCOS EMILFORK S
Revista chilena de pediatría , 2009,
Abstract: El Síndrome Nefrótico primario (SN) responde favorablemente a corticoides en un 80-90% de los casos. Los pacientes cortico resistentes (SNCR) evolucionan, en su gran mayoría, a insuficiencia renal crónica (IRC). De etiología desconocida, se ha reportado la presencia de un factor de permeabilidad (FP) en el suero de estos pacientes, con algunos efectos conocidos a nivel de otras membranas biológicas, incluyendo el peritoneo. Objetivo: Evaluar las pérdidas proteicas vía peritoneo en ni os con SNCR en diálisis peritoneal crónica (DP). Pacientes y Método: Análisis retrospectivo de 4 a os (2003-2007), Se incluyeron 9 pacientes portadores de SNCR (grupo 1), y un grupo control de 10 ni os en DP portadores de IRC por otra etiología (grupo 2). Se evaluó a los 2 grupos al mes 1 y 6 ó 12 de su ingreso. Los grupos fueron comparables respecto a edad, sexo, peso, superficie corporal, tiempo en DP, concentración de dextrosa utilizada, modalidad dialítica y dosis de diálisis. Resultados: No se observó diferencias de los parámetros bioquímicos (creatinina, nitrógeno ureico, calcio, fósforo). La hormona paratiroidea (PTH) fue significativamente mayor en el grupo control (164 ± 144 vs 564 ± 454 pg/dl p < 0,05), y la albúmina fue menor en los pacientes con SN al inicio (2,27 ± 0,63 gr/dl vs 3,62 ± 1,45 gr/dl p < 0,05) y al final de la evaluación (2,8 ± 0,5 gr/dl vs 3,9 ±0,86 gr/dl, p < 0,05). Las pérdidas proteicas peritoneales fueron significativamente mayores en el grupo 1 vs el grupo 2 al ingreso: 3,41 ± 2,01 vs 1,76 ± 1,45 gr/m2/día, y al final de la evaluación: 4,27 ± 3,47 vs 1,66 ±1,31 gr/m2/día, (p < 0,05) respectivamente. Lo mismo ocurrió con las pérdidas urinarias. No hubo diferencias en la ingesta proteica, KtV peritoneal ni KtV total entre los grupos, mientras que el KtV residual fue significativamente menor en los pacientes nefróticos al término del estudio, sugiriendo una caída más precoz de la función renal residual. Tampoco se observó diferencias respecto a las tasas de peritonitis en el período estudiado. Conclusión: Las pérdidas de proteínas por peritoneo en pacientes en DP portadores de SN, son significativamente mayores que en el resto de los pacientes en DP, y son consistentes con un posible efecto sistémico de un FP en estos pacientes. Primary Nephrotic Syndrome (NS) responds favorably to steroids in 80-90% of cases. Most corticoresistant (CR) patients evolve into Chronic Renal Failure (CRF), Of unknown origin, a permeability factor in these patient's serum has been reported, with some known effects in membranes including the peritoneum. Objective: To e
Pérdidas Proteicas Peritoneales en Ni?os Portadores de Síndrome Nefrótico en Diálisis Peritoneal
QUIROZ Z,LILY; AZóCAR P,MARTA; DINAMARCA S,HéCTOR; EMILFORK S,MARCOS; CANO SCH,FRANCISCO;
Revista chilena de pediatría , 2009, DOI: 10.4067/S0370-41062009000500004
Abstract: primary nephrotic syndrome (ns) responds favorably to steroids in 80-90% of cases. most corticoresistant (cr) patients evolve into chronic renal failure (crf), of unknown origin, a permeability factor in these patient's serum has been reported, with some known effects in membranes including the peritoneum. objective: to evaluate peritoneal protein loss in cr children on chronic peritoneal dialysis (cpd). patients and methods: four year retrospective analysis. group 1 included 9 cr children, group 2 was a control group of 10 children with crf of other causes on cpd. children in both groups were comparable in age, gender, weight, body surface, duration of cpd, concentration of solution, modality and dose of dialysis. both groups were evaluated at 1, 6 and 12 months after admission. results: no differences were observes in biochemical parameters: creatinine, urea nitrogen, calcium, phosphorus. pth (parathyroid hormone) was significantly higher in the control group (164 ± 144 vs 564 ± 454 pg/dl p < 0,05), albumin was lower in ns patients at the beginning (2.27 ± 0.63 gr/dl vs 3.62 ± 1.45 gr/dl p < 0,05) and end (2.8 ± 0.5 gr/ dl vs 3.9 ± 0.86 gr/dl, p < 0,05) of the evaluation. peritoneal protein loss was significantly larger in the index group at the beginning (3,41 ± 2,01 vs 1,76 ± 1,45 gr/m7dia), and end (4,27 ± 3,47 vs 1,66 ±1,31 gr/m7dia, (p < 0.05) of the evaluation. the same happened with urinary loss: while there was no difference in protein intake, peritoneal ktv or total ktv between groups, residual ktv was significantly lower among ns patients at the end of the study, suggesting an earlier drop in residual renal function. no differences were observed in rates of peritonitis between groups in the study period. conclusion: peritoneal protein loss in cpd children with ns are significantly larger than other patients in cpd, suggesting a possible systemic permeability factor in these patients.
Patrones alimentarios y su relación con sobrepeso y obesidad en ni?as chilenas de nivel socioeconómico medio alto
Lera Marqués,Lydia; Olivares Cortés,Sonia; Leyton Dinamarca,Bárbara; Bustos Zapata,Nelly;
Archivos Latinoamericanos de Nutrición , 2006,
Abstract: summary the aim of the present study was to identify dietary patterns in girls and to assess their association with obesity or overweight. a school-based sample of 108 girls between 8 and 11 years of medium-high socioeconomic level was selected in santiago, chile. the body mass index was calculated and a quantified food frequency and physical activity questionnaires (validated in the fao/mineduc/inta project nutritional education in primary schools) were applied. four distinct dietary factors or patterns were obtained explaining 54% of the total variation using factorial analysis. the first factor was characterized by an energy-dense diet (high consumption of fat foods, ice creams, chocolates, french fries, snacks). the second factor represented a healthy diet (dairy products, fruits and salads). the third factor represented intake of soft drinks (either with or without sugar). the fourth factor represented a diet rich in calories and sugars (bread, sausages, sweets). the association between the four dietary factors and overweight/obesity was assessed through logistic regression models. the first factor, energy-dense foods, was the only one significantly associated with the presence of obesity (or = 1.86; 95% ci: 1.12 - 3.09). the results of this research about dietary patterns are consistent with studies carried out in other countries.
Composición corporal de neonatos con alteraciones en el crecimiento fetal
Francisco Mardones S.,Gabriel Bastías S.,Marcelo Farías J.,Raúl Dinamarca V.
Revista chilena de pediatría , 1999,
Abstract: Con el objetivo de estudiar la asociación entre la composición corporal en recién nacidos con el peso al nacer y las alteraciones del crecimiento fetal, se estimó las masas magra y grasa de 224 recién nacidos de familias de bajos ingresos en Santiago de Chile, utilizando el método antropométrico de Dauncey. En el total de estos ni os sanos de término la proporción de masa grasa fue 16,5%. Hubo una fuerte y significativa asociación positiva del peso al nacer con la masa magra (r2 = 88,9%) y con la masa grasa (r2= 58,2%). Aunque la masa grasa constituyó sólo 16,5% del peso al nacer, explicó una gran proporción de su varianza (58,2%). En los neonatos con retardo del crecimiento fetal o con bajo índice ponderal hubo una composición corporal particular. Esos recién nacidos tuvieron valores absolutos inferiores tanto de la masa grasa como de la masa magra, pero sólo la masa grasa fue proporcionalmente menor que en los ni os normales o con sobrepaso. El déficit nutricional de estos ni os está asociado con un mayor riesgo de afecciones perinatales, por lo que debiera ser prevenido con una adecuada alimentación de la madre durante el embarazo. Los resultados obtenidos, similares a los de estudios previos en países desarrollados, sugieren que la estimación de la composición corporal podría ser útil para evaluar el crecimiento fetal al momento del nacimiento To study the association between body composition of newborn infants, birthweight and altered foetal growth. The lean body mass and fat of 224 newbom infants in low-income families in Santiago, Chile were measured using the anthropometric method of Dauncey. In healthy children the proportion of fat was 16.5%. There was a significant positive association of birthweight with lean body mass (r2 = 88.9%) and with fat content (r2 = 58.2%). Although the fat content constitutes only 16.5% of the birthweight, it explains a great portion of the variation in body weight (58.2%). In the neonates with retarded foetal growth or with low birthweight it was found a different body composition. These neonates had absolute values inferior in terms of both lean body mass and fat content, but only in fat content were they proportionally less than normal neonates or those with obesity. The nutritional deficit of these infants is associated with a bigger risk of perinatal disease, which should be prevented with an adequate alimentation of the mother during pregnancy. The results obtained similar lo previous studies in developed countries, suggest that the estimation of body composition could be useful to evaluate foetal growth at t
Molecular characterization of a cDNA encoding Cu/Zn superoxide dismutase from Deschampsia antarctica and its expression regulated by cold and UV stresses
Jaime R Sánchez-Venegas, Jorge Dinamarca, Ana Moraga, Manuel Gidekel
BMC Research Notes , 2009, DOI: 10.1186/1756-0500-2-198
Abstract: The molecular characterization shows that SOD cDNA is 709 bp in length, which translates an ORF of 152 amino acids that correspond to a protein of predicted molecular mass of 15 kDa. The assay shows that the expression of SOD gene increases when D. antarctica is acclimatised to 4°C and exposed to UV radiation. These results indicate that the SOD gene of D. antarctica is involved in the antioxidative process triggered by oxidative stress induced by the conditions of environmental change in which they live.The present results allow us to know the characteristics of Cu/ZnSOD gene from D. antarctica and understand that its expression is regulated by cold and UV radiation.Superoxide dismutase (SOD; EC 1.15.1.1) is a ubiquitous enzyme belonging to a family of metalloenzymes, which catalyze the dismutation of superoxide radicals to hydrogen peroxide and molecular oxygen. The reaction is continued by catalase (CAT) and ascorbate peroxidase (APX), converting the hydrogen peroxide to water and molecular oxygen, thus preventing the formation of hydroxyl radicals, which are highly destructive to the cell [1,2]. The enzyme SOD is considered the first-line defense because it catalyses the first reaction in the system harvesting oxygen-free radicals [3]. Therefore, SOD prevents the oxidation of biological molecules, performed by the same radicals or their derivatives [4].Three types of SOD have been characterized based on the nature of the metal co-factor present in the catalytic site, these are: SODs with copper/zinc (Cu/ZnSOD) [5], iron (FeSOD) [6] or manganese (MnSOD) [7]. In cell plant, the Cu/ZnSOD is generally found in the chloroplasts, the cytosol, and possibly in the extracellular space. MnSOD is location in the mitochondria and the peroxisome; whereas FeSOD is present within the chloroplasts of some plants [8,9]. The first Cu/ZnSOD genes were cloned from maize and pea plants [10,11]. SOD sequences of other plants were subsequently cloned, such as snuff [12], tomato [13],
Internet: de luces y sombras
Dinamarca,Hernán;
Polis (Santiago) , 2011, DOI: 10.4067/S0718-65682011000100021
Abstract: today we are witnessing an unprecedented historical and cultural challenge: the relentless and uncritical expansion of information and communications technologies (ict), inasmuch as they extend our mental capabilities and communicative limits even unsuspected. given the radical nature of its impact, the challenge is to start living ict responsibly, creatively and critically. until now, however, we have lived dazzle with their lights and blind to their shadows. in the essay, we ask both "what does a new technology build?" as well as "what as well does it unbuild?" through a preliminary approach, we try to contribute to the debate about the existential, cognitive, communicative and social impacts of ict.
PRESENTACIONES EN LA ERA DE POWERPOINT
Dinamarca O,Víctor;
Revista chilena de radiología , 2006, DOI: 10.4067/S0717-93082006000300004
Abstract: teaching or research material is an important part of the work for health professionals. effectiveness of an oral presentation depends on the ability of the speaker to communicate with the audience. some individuals are born with the skills of an effective public speaker. most of us need to learn these skills and must be continually improving them. powerpoint software is an useful tool to develop presentations but is necessary to follow some rules or guides to obtain better results. this article will be focused in work to improve communication with the audience following some general principles and providing tips to develop effective slides by using powerpoint
PRESENTACIONES EN LA ERA DE POWERPOINT
Víctor Dinamarca O
Revista Chilena de Radiología , 2006,
Abstract: La presentación de material educativo o de investigación es parte muy importante del trabajo de los profesionales de la salud. El impacto de una presentación oral depende de la habilidad del expositor para comunicarse con la audiencia. Algunas personas nacen con las habilidades de comunicador, pero la mayoría de nosotros necesita aprender técnicas y desarrollarlas continuamente. El programa PowerPoint resulta útil para realizar presentaciones, siendo necesario seguir algunas pautas con el objeto de obtener mejores resultados. Este artículo entrega datos que ayudan a progresar en la forma de comunicarse con la audiencia y en el desarrollo de diapositivas a través de herramientas PowerPoint Teaching or research material is an important part of the work for health professionals. Effectiveness of an oral presentation depends on the ability of the speaker to communicate with the audience. Some individuals are born with the skills of an effective public speaker. Most of us need to learn these skills and must be continually improving them. PowerPoint software is an useful tool to develop presentations but is necessary to follow some rules or guides to obtain better results. This article will be focused in work to improve communication with the audience following some general principles and providing tips to develop effective slides by using PowerPoint
Simultaneous hydrogen production and consumption in Anaerobic mixed culture fermentation
Carlos Dinamarca, Rune Bakke
International Journal of Energy and Environment , 2012,
Abstract: The aim of the present study is to investigate the relevance of homoacetogenic H2 consumption on the bio-hydrogen yield and products distribution in mixed culture fermentation. A hybrid anaerobic reactor was operated for 93 days with variable pH and organic loads between 8-16 g glucose/L.d for this purpose. High initial H2 yield decreased gradually to an equivalent of 0.02-0.4 mol H2/mol glucose consumed. The distribution of the dissolved organic products was influenced strongly by reactor pH, while the overall H2 yield was not. Low H2 yield is attributed mainly to homoacetogenesis at pH greater than 4.6 and to reduced products formation at pH less than 4.6. Simultaneous hydrogen production and consumption occurred and at least 22 % of the produced molecular hydrogen, mainly from butyrate fermentation, was used for the reduction of CO2 to acetate.
Process parameters affecting the sustainability of fermentative hydrogen production: A short-review
Carlos Dinamarca, Rune Bakke
International Journal of Energy and Environment , 2011,
Abstract: Anaerobic fermentation is regarded as the least energy intensive method for H2 production. Extensive literature on experimental attempts to achieve the highest possible theoretical yield (e.g. 4 mol H2/mol glucose) is available. All published steady state, mixed culture studies show yields much lower than the theoretical maximums for the substrates applied. This article summarizes the influence of key process parameters (pH and buffer systems, temperature, H2 partial pressure, feed stock, and reactor configuration) on fermentative hydrogen production. The following three requirements for successful Bio-H2 fermentation in mixed cultures are identified: (1) Maintain environmental conditions for the formation of oxidized products; (2) Optimize the relationship between biomass and hydrogen yields; and (3) Maintain unfavorable conditions for hydrogen consuming organisms. Fulfilling these requirements has not yet been achieved in stable continuous cultures, and it may not be achievable do to some fundamental limitation.
Page 1 /331508
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.