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Search Results: 1 - 10 of 472496 matches for " Gastón Brice?o R. "
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Características Clínico-Epidemiológicas de pacientes en Fototerapia por Psoriasis en el Hospital Hernán Henríquez Aravena entre los a os 2007 y 2009.
álvaro San Martin L.,Luis Qui?i?ir S.,Gastón Briceo R.
Revista ANACEM , 2010,
Abstract: La psoriasis es un trastorno crónico común de la piel, se caracteriza por pápulas eritematosas y escamas blancas, aunque el diagnóstico diferencial de la psoriasis es amplio, en la gran mayoría de los casos sólo se necesita la anamnesis y el examen físico. En el tratamiento, la luz ultravioleta (UV) ha sido reconocida como beneficiosa a través de sus efectos antiproliferativos y anti-inflamatorios. El propósito nuestro trabajo es describir las características clínicas y epidemiológicas de esta patología en pacientes sometidos a fototerapia en el Hospital Hernán Henríquez Aravena de Temuco entre septiembre de 2007 y diciembre 2009. Se realizó un estudio retrospectivo en el que se revisaron fichas clínicas y informes de fototerapia de 60 pacientes portadores de psoriasis. El tipo clínico más común fue la psoriasis en placa con un 90% de los casos, seguida de psoriasis eritrodérmica con un 5%, el tipo de piel más común fue el Tipo 2 con un 87,7% de los casos. En cuanto a la severidad, la psoriasis moderada fue el 46,8% de los casos, con un índice de severidad y área de psoriasis (PASI) promedio del grupo estudiado de 11,61 siendo el tipo de psoriasis con mayor gravedad el tipo eritrodérmica (p=0,008). La asociación entre severidad y tipo de piel fue significativa siendo los tipos de piel 1 el que presentó mayor severidad (p=0,012) Nuestro estudio demostró algunas asociaciones significativas entre severidad y tipo de psoriasis, y con tipo de piel. Además de una frecuencia similar en ambos sexos coincidiendo con lo reportado en la literatura.
El ni?o con cáncer
Calca?o Loynaz,Gastón; Briceo Iragorry,Leopoldo;
Gaceta Médica de Caracas , 2001,
Abstract: summary the creation of the commission of pediatric oncology in the university hospital of caracas in 1979, started an era of the multidisciplinary treatment of cancer in children. the late diagnosis, the absence of defined plans and the irregularity of the treatment, and of the bad pursuit, become the primordial factors in the high indexes of mortality, from there the necessity to create these teams. differences are made as for the adult's cancer and that of children; the genetic origin, the external elements that can stimulate the appearance of cancer, symptoms, etc. we analyze the modern techniques of exploration and the utility of the combined treatment of surgery, chemotherapy and radiotherapy, as well as the use of technical of central accesses with catheters.
El ni o con cáncer
Gastón Calca?o Loynaz,Leopoldo Briceo Iragorry
Gaceta Médica de Caracas , 2001,
Abstract: RESUMEN La creación de la comisión de oncológica pediátrica en el Hospital Universitario de Caracas en 1979 inició una era del tratamiento multidisciplinario del cáncer en el ni o. El diagnóstico tardío, la ausencia de planes definidos y la irregularidad del tratamiento amén del mal seguimiento, se convierten en los factores primordiales de los altos índices de mortalidad, de allí la necesidad de crear estos equipos. Se hacen diferencias en cuanto al cáncer del adulto y el del ni o, el origen genético, los elementos externos que puedan estimular la aparición del cáncer, síntomas, etc. Analizamos las técnicas modernas de exploración y la utilidad del tratamiento combinado de cirugía, quimioterapia y radioterapia, así como el uso de técnicas de accesos centrales con catéteres. SUMMARY The creation of the commission of pediatric oncology in the University hospital of Caracas in 1979, started an era of the multidisciplinary treatment of cancer in children. The late diagnosis, the absence of defined plans and the irregularity of the treatment, and of the bad pursuit, become the primordial factors in the high indexes of mortality, from there the necessity to create these teams. Differences are made as for the adult's cancer and that of children; the genetic origin, the external elements that can stimulate the appearance of cancer, symptoms, etc. We analyze the modern techniques of exploration and the utility of the combined treatment of surgery, chemotherapy and radiotherapy, as well as the use of technical of central accesses with catheters.
Prevalencia de la infección genital por virus papiloma humano en hombres universitarios voluntarios de la IX Región, Chile Prevalence of human papillomavirus genital infection among male university students
Pablo Guzmán,Carmen Ili,Patricio Rifo,Gastón Briceo
Revista médica de Chile , 2008,
Abstract: Background: Human papillomavirus (HPV) infection is the most common sexually transmitted disease. Aim: To determine prevalence of HPV genital infection in voluntary asymptomatic male university students. Material and methods: A cross-sectional study in 62 asymptomatic, sexually active male students. Exfoliated cells were obtained from the penüe shaft and coronal sulcus. Samples were analyzed for HPV DNA detection and genotyping by polymerase chain reaction and Reverse Line Blot. Results: The prevalence of HPV infection was 84%. HPV detection was 77% in penile shaft and 66% in coronal sulcus. The most commonly detected types were HPV-16 (45%), HPV-11 (19%), HPV-6 (10%) and HPV-18 (9%). Múltiple infection wasfoundin 54%. The most frequent combinations were VPH11/16 (18%) and VPH16/18 (5%). Conclusions: HPV infection is highly frequent in asymptomatic male university students, high rísk HPV types were greatly predominant.
Prevalencia de la infección genital por virus papiloma humano en hombres universitarios voluntarios de la IX Región, Chile
Guzmán,Pablo; Ili,Carmen; Rifo,Patricio; Briceo,Gastón; Araya,Juan; Villaseca,Miguel; Roa,Juan Carlos;
Revista médica de Chile , 2008, DOI: 10.4067/S0034-98872008001100003
Abstract: background: human papillomavirus (hpv) infection is the most common sexually transmitted disease. aim: to determine prevalence of hpv genital infection in voluntary asymptomatic male university students. material and methods: a cross-sectional study in 62 asymptomatic, sexually active male students. exfoliated cells were obtained from the penüe shaft and coronal sulcus. samples were analyzed for hpv dna detection and genotyping by polymerase chain reaction and reverse line blot. results: the prevalence of hpv infection was 84%. hpv detection was 77% in penile shaft and 66% in coronal sulcus. the most commonly detected types were hpv-16 (45%), hpv-11 (19%), hpv-6 (10%) and hpv-18 (9%). múltiple infection wasfoundin 54%. the most frequent combinations were vph11/16 (18%) and vph16/18 (5%). conclusions: hpv infection is highly frequent in asymptomatic male university students, high rísk hpv types were greatly predominant.
Individual plant and population biomass of dominant shrubs in Patagonian grazed fields
O?atibia,Gastón R; Aguiar,Martín R; Cipriotti,Pablo A; Troiano,Fernando;
Ecolog?-a austral , 2010,
Abstract: estimating aboveground biomass of vegetation is essential for population, community and ecosystem studies. in systems dominated or co-dominated by woody species, biomass estimation is difficult, and rapid and non-destructive methods are needed. in this study, we describe biomass distribution in different components (i.e., wood, leaves) and how this changes with shrub size for the three dominant species of shrubs in the occidental district of the patagonian steppe. we also describe the population size structure of the three species in grazed fields and estimate their contribution to total abundance and biomass through a non-destructive method. we developed allometric equations to estimate aboveground biomass components of individual shrubs from structural descriptors (i.e., diameter and height of the crown), sampling individual plants of different sizes. the variable that best predicted biomass of the three species was the sum of the height and the average diameter of the crown (calculated with the largest diameter and its perpendicular). allometric models for each species explained more than 83% of the variability of individual aboveground biomass. at the individual level, species had different proportions of wood, leaves and specific wood weight. increasing shrub size was accompanied by changes in the proportion of leaves to wood, and in some cases, the percentage of dead crown. at the population level, the three species differed in size distribution in moderately grazed fields. development of allometric models from a population perspective is important to study demographic processes that drive community and ecosystem responses to environmental and land-use changes.
Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
MáRQUEZ,EDJULY J.; FARI?AS,MARIO R.; BRICEO,BENITO; RADA,FERMíN J.;
Revista chilena de historia natural , 2004, DOI: 10.4067/S0716-078X2004000400008
Abstract: in venezuelan paramos grasses, after asteraceae, are the second family in numerical importance. we studied their distribution in an altitudinal gradient located in venezuela, sierra de la culata, between 2,500 and 4,200 m of altitude. twenty one 32 m parallel line transects every 50 m were placed along the gradient, perpendicular to the main slope. each line was divided into contiguous 50 x 50 cm sampling units. grass species occurrence inside each sample unit was considered to determine their frequency in each line or altitude. the peak and altitudinal amplitude was determined through the weighted averaging method. a total of 47 grass species were found along the gradient. agrostis was the best-represented genus in the gradient. considering the distribution ranges, we assume that there are different biotic and abiotic processes determining the distribution patterns. the species occurring at the highest altitudes were temperate elements, while those in the lowest areas were tropical and subtropical elements. seven species in the gradient are endemic to the venezuelan paramos. grass distribution patterns in the paramo may be related to phytogeographical origin. in order to better understand the plant altitudinal distribution pattern is necessary to consider the plant responses to low temperatures, high incoming radiation, water stress and slope aspect
Distribution of grasses along an altitudinal gradient in a Venezuelan paramo Distribución de gramíneas a lo largo de un gradiente altitudinal en un páramo de Venezuela
EDJULY J. MáRQUEZ,MARIO R. FARI?AS,BENITO BRICEO,FERMíN J. RADA
Revista chilena de historia natural , 2004,
Abstract: In Venezuelan paramos grasses, after Asteraceae, are the second family in numerical importance. We studied their distribution in an altitudinal gradient located in Venezuela, Sierra de La Culata, between 2,500 and 4,200 m of altitude. Twenty one 32 m parallel line transects every 50 m were placed along the gradient, perpendicular to the main slope. Each line was divided into contiguous 50 x 50 cm sampling units. Grass species occurrence inside each sample unit was considered to determine their frequency in each line or altitude. The peak and altitudinal amplitude was determined through the weighted averaging method. A total of 47 grass species were found along the gradient. Agrostis was the best-represented genus in the gradient. Considering the distribution ranges, we assume that there are different biotic and abiotic processes determining the distribution patterns. The species occurring at the highest altitudes were temperate elements, while those in the lowest areas were tropical and subtropical elements. Seven species in the gradient are endemic to the Venezuelan paramos. Grass distribution patterns in the paramo may be related to phytogeographical origin. In order to better understand the plant altitudinal distribution pattern is necessary to consider the plant responses to low temperatures, high incoming radiation, water stress and slope aspect En los páramos de Venezuela las gramíneas son la segunda familia numéricamente más importante, después de las Asteraceae. Nosotros estudiamos su distribución en un gradiente altitudinal ubicado en Venezuela, Sierra de La Culata, entre 2.500 y 4.200 m de altitud. Para esto colocamos 21 transectas de 32 m de longitud a lo largo del gradiente, ubicados de manera perpendicular a la pendiente, cada 50 m en altitud. Cada transecta estaba dividida en unidades de muestreo contiguas de 50 x 50 cm. Para estimar la frecuencia de las especies en cada transecta o altitud, consideramos la ocurrencia de las mismas dentro de cada una de las unidades de muestreo. Determinamos el óptimo y la amplitud altitudinal a través del método de los promedios ponderados. Encontramos un total de 47 especies de gramíneas distribuidas a lo largo del gradiente. Agrostis fue el género mejor representado. Teniendo en cuenta los intervalos de distribución, podemos asumir que hay diferentes procesos que determinan la distribución de las especies, pudiendo estos ser de origen biótico y abiótico. Las especies que ocurren a mayores altitudes correspondieron a elementos templados, mientras que aquellos que ocurren en áreas de menor altitud fueron
PANCREATITIS AGUDA: INDICE DE SEVERIDAD EN TC. EVALUACION DE COMPLICACIONES Y HOSPITALIZACION
Schwaner C,Jaime; Rivas B,Francisco; Cancino N,Adrián; Torres R,Osvaldo; Briceo C,Carlos; Riquelme P,Fernando;
Revista chilena de radiología , 2003, DOI: 10.4067/S0717-93082003000400005
Abstract: objectives. we compare the classic tomographic criteria of balthazar and the index of severity as a predictive factor for the development of complications and length of hospital stay. material and method. retrospective study of 61 patients with clinical diagnostic of acute pancreatitis to whom an abdominal ct was made, with an intravenous bolus injection of contrast material. these explorations were analyzed with the balthazar criteria, pancreatic degree of necrosis and the index of severity of the ct. later, we made a correlation with the appearance of complications and the hospital days. result. the result was similar to other studies in the prediction of complications and length of hospital stay, but with less average days in our series and without mortality. conclusión. we concluded that the pancreatic factor of necrosis and the index of severity in the tomographic study improve the valuation foretells of the acute pancreatitis
Restauración ecológica para ecosistemas nativos afectados por incendios forestales (2010)
GASTóN O CARVALLO
Revista chilena de historia natural , 2010,
Abstract:
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