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Search Results: 1 - 10 of 482492 matches for " Jorge Cabrera Pe?a "
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Depredación de neonatos de Lepidochelys olivacea (Reptilia: Cheloniidae) por Quiscalus mexicanus (Passeriformes: Icteridae)
Jorge Cabrera Pea
Revista de Biología Tropical , 1998,
Abstract:
Biopsia por aspiración con aguja fina en afecciones quirúrgicas del tiroides
Pea Hernández,Elio J; Martínez Cabrera,Jorge;
Revista Cubana de Cirug?-a , 2002,
Abstract: a prospective study was conducted during 3 years to determine the value of fine needle aspiration biopsy (fnab) in the surgical thyropathies at our service. the technique and the criteria of lowhagen were used to carry out the procedure. 402 patients underwent aspiration biopsies and 398 were useful for the diagnosis. 100 of them were operated on. benignity prevailed in 84 % and the follicular adenoma was the most frequent in 59.9 %. cancer was present in 16 % and 68.7 % corresponded to the papillary vairety. women aged 41-50 were more affected. hemithyroidectomy was the most used surgical procedure. the fnab was assessed in the parameters of sensitivity, 93.7 %; specificity, 88 %; positive predictive index, 60 %; negative predictive index, 98.6 %; efficiency, 89 % and false positive fraction, 11.9 %
Biopsia por aspiración con aguja fina en afecciones quirúrgicas del tiroides
Elio J Pea Hernández,Jorge Martínez Cabrera
Revista Cubana de Cirugía , 2002,
Abstract: Se realizó estudio prospectivo durante 3 a os para determinar el valor de la biopsia por aspiración con aguja fina (BAAF) en las tiroideopatías quirúrgicas en nuestro servicio. Se emplearon la técnica y los criterios de Lowhagen para la realización del proceder. Se realizaron aspiraciones a 402 pacientes, y fueron 398 útiles para diagnóstico, de ellos se operaron 100 pacientes. La benignidad predominó en el 84 %, y fue el adenoma folicular el más frecuente en el 59,9 %. El cáncer se presentó en el 16 % para corresponder a la variedad papilar el 68,7 %. El sexo femenino se vio más afectado entre las edades de 41 a 50 a os. El proceder quirúrgico más empleado fue la hemitiroidectomía. La BAAF se valoró en los parámetros de: sensibilidad 93,7 %, especificidad 88 %, índice predictivo positivo 60 %, índice predictivo negativo 98,6 %, eficacia 89 % y fracción falso positivo 11,9 % A prospective study was conducted during 3 years to determine the value of fine needle aspiration biopsy (FNAB) in the surgical thyropathies at our service. The technique and the criteria of Lowhagen were used to carry out the procedure. 402 patients underwent aspiration biopsies and 398 were useful for the diagnosis. 100 of them were operated on. Benignity prevailed in 84 % and the follicular adenoma was the most frequent in 59.9 %. Cancer was present in 16 % and 68.7 % corresponded to the papillary vairety. Women aged 41-50 were more affected. Hemithyroidectomy was the most used surgical procedure. The FNAB was assessed in the parameters of sensitivity, 93.7 %; specificity, 88 %; positive predictive index, 60 %; negative predictive index, 98.6 %; efficiency, 89 % and false positive fraction, 11.9 %
Crecimiento y ciclo reproductivo de Polymesoda radiata (Bivalvia:Corbiculidae) en Costa Rica
Ruiz Campos,Eleazar; Cabrera Pea,Jorge; Cruz,Rafael A.; Palacios,José A.;
Revista de Biología Tropical , 1998,
Abstract: a population of green clam, polymesoda radiata was sampled from august 1992 through july 1993 in bebedero river, guanacaste, costa rica (n= 978) for demographic data. mean values (followed by ranges) were: shell length 32.29 ±7.63 mm (6.9-44.10 mm). the mean total weight was 11.13 ±5.71 g (0.4-23.98 g). data analysis showed a isometric relationship between length and total weight, represented by the equation : pt=2.07 x 10-4 lt3.01 (r=0.987, p < 0.01). von bertalanffy's equations were: for length lt=45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] and for weight pt= 26.53 (1- e [-1 (t + 0.06)])3 . the growth rate for total length was 2.25 ±0.66 mm/month for the first year (0.83 ±0.24 the second year and 0.26 ±0.1 for other months). individuals become sexually mature throughout the year. the mean sex ratio was 1.00 male : 0.61 females. spawning suggested that minimum size at sexual maturity was 7.80 mm of lt. the largest number of ripe individuals was found in the dry season. spawning peaks were in december and march. histologically this is a dioecious bivalve with stable gonocorism.
Composición bioquímica de la carne de Polymesoda radiata (Bivalvia: Corbiculidae), en Costa Rica
Ruiz Campos,Eleazar; Cabrera Pea,Jorge; Cruz,Rafael A.; Palacios,José A.;
Revista de Biología Tropical , 1998,
Abstract: monthly changes in biochemical composition and condition index of the green clam, polymesoda radiata were studied from august 1992 through july 1993 in bebedero river, guanacaste, costa rica. this species has a continuous spawning throughout the year with maximun periods in december and april (following values are % means and standard deviations). fresh meat was 12.53 ± 3.78 . dry flesh compositions: 78.29 ± 2.15 proteins; 9.52 ± 1.00 lipids; 5.78 ± 2.50 carbohydrates; and 6.43 ± 2.10 ashes. water 90.10 ± 2.14 (correlated with the spawning period). the condition index was 9.89 ± 2.14. dry flesh caloric value: 4.51 ± 0.11 kcal/g. the condition index, caloric value and carbohydrates decreased during the spawning period. lipids, proteins and ashes had not relationship with the spawning period. the mean condition index was inverse correlation with the spawning period.
Composición bioquímica de la carne de Polymesoda radiata (Bivalvia: Corbiculidae), en Costa Rica
Eleazar Ruiz Campos,Jorge Cabrera Pea,Rafael A. Cruz,José A. Palacios
Revista de Biología Tropical , 1998,
Abstract: Se determinó la composición bioquímica y el indice de condición de la almeja verde (Polymesoda inflata) en el río Bebedero, Guanacaste, Costa Rica, entre agosto de 1992 y julio de 1993. El peso promedio de carne fresca fue de 12.53 ± 3.78 % , con un valor promedio de humedad de 90.10 ± 2.14 % . El promedio de los componentes en base seca fue proteínas 78.29 ± 2.15, lípidos 9.52 ±1 %, carbohidratos 5.78 ± 2.5 % y cenizas 6.43 ± 2.1 %. El promedio del índice de condición para la población fue de 9.89 ± 2.14. El promedio del valor calórico fue 4.51 ± 0.11 Kcal/g . Se determinó que el índice de condición, valor calórico y carbohidratos decrecen con la época reproductiva. Los lípidos, proteínas y cenizas no tiene relación con el ciclo reproductivo. Monthly changes in biochemical composition and condition index of the green clam, Polymesoda radiata were studied from August 1992 through July 1993 in Bebedero river, Guanacaste, Costa Rica. This species has a continuous spawning throughout the year with maximun periods in December and April (following values are % means and standard deviations). Fresh meat was 12.53 ± 3.78 . Dry flesh compositions: 78.29 ± 2.15 proteins; 9.52 ± 1.00 lipids; 5.78 ± 2.50 carbohydrates; and 6.43 ± 2.10 ashes. Water 90.10 ± 2.14 (correlated with the spawning period). The condition index was 9.89 ± 2.14. Dry flesh caloric value: 4.51 ± 0.11 Kcal/g. The condition index, caloric value and carbohydrates decreased during the spawning period. Lipids, proteins and ashes had not relationship with the spawning period. The mean condition index was inverse correlation with the spawning period.
Crecimiento y ciclo reproductivo de Polymesoda radiata (Bivalvia:Corbiculidae) en Costa Rica
Eleazar Ruiz Campos,Jorge Cabrera Pea,Rafael A. Cruz,José A. Palacios
Revista de Biología Tropical , 1998,
Abstract: Se determinó el crecimiento, biometría, desarrollo gonádico, ciclo reproductivo y talla mínima reproductiva en Polymesoda radiata en el río Bebedero, Guanacaste Costa Rica, entre agosto 1992 y julio 1993. El promedio de la longitud total fue 32.29 ±7.63 mm (ámbito entre 6.90 to 44.10 mm). El peso total fue 11.13 ±5.71 g (ámbito entre 0.4 to 23.98 g). La relación Lt-Pt determinó que el crecimiento es de tipo isométrico y se rige por la ecuación Pt= 2.07 x 10-4 Lt3.01 (r=0.987, p 0.01). La ecuación generalizada de von Bertalanffy se rige para Lt por Lt= 45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] y para peso total por Pt= 26.53 (1- e [-1 (t + 0.06)] )3. La tasa de crecimiento para Lt fue de 2.25 ±0.66 mm/mes para el primer a o, 0.83 ±0.24 mm/mes para el segundo a o y 0.26 ±0.1 mm/mes para el resto de los meses. Durante todo el a o se encontraron individuos en las diferentes etapas reproductivas. La proporción sexual para el periodo de estudio fue de 1.00 macho:0.61 hembras. La talla a la que se distinguen células sexuales tanto para machos como hembras fue de 6.62 mm y se establece como talla mínima reproductiva 7.80 mm, ya que a partir de ésta se observaron individuos desovados. La mayor actividad de desove se observó durante la época seca con dos picos máximos de desove al a o, uno en diciembre y el otro en marzo. El análisis histológico determinó que la especie es dioica con un bajo porcentaje de hermafroditismo en la población (2.15 %). A population of green clam, Polymesoda radiata was sampled from August 1992 through July 1993 in Bebedero river, Guanacaste, Costa Rica (n= 978) for demographic data. Mean values (followed by ranges) were: shell length 32.29 ±7.63 mm (6.9-44.10 mm). The mean total weight was 11.13 ±5.71 g (0.4-23.98 g). Data analysis showed a isometric relationship between length and total weight, represented by the equation : Pt=2.07 x 10-4 Lt3.01 (r=0.987, p < 0.01). Von Bertalanffy's equations were: for length Lt=45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] and for weight Pt= 26.53 (1- e [-1 (t + 0.06)])3 . The growth rate for total length was 2.25 ±0.66 mm/month for the first year (0.83 ±0.24 the second year and 0.26 ±0.1 for other months). Individuals become sexually mature throughout the year. The mean sex ratio was 1.00 male : 0.61 females. Spawning suggested that minimum size at sexual maturity was 7.80 mm of Lt. The largest number of ripe individuals was found in the dry season. Spawning peaks were in December and March. Histologically this is a dioecious bivalve with stable gonocorism.
Composición, crecimiento e índice de condición de una población de Poecilia reticulata (Pisces: Poeciliidae), en un estanque en Heredia, Costa Rica
Urriola Hernández,Mario; Cabrera Pea,Jorge; Protti Quesada,Maurizio;
Revista de Biología Tropical , 2004,
Abstract: a pond population of poecilia reticulata was studied in santo domingo, heredia, costa rica, between september and november of 1998. the sex ratio was 1:0.49 (males:females). the mean total length was 34.43 ± 7.26 mm for females, 23.50 ± 2.24 mm for males and 12.27 ± 3.41 mm for juveniles. the mean total weight was 0.69 ± 0.48 g for females; and 0.16 ± 0.05 g for males and 0.026 ± 0.027 g for juveniles. the total length-weight relationship for the total population was p= 6 x 10-5 lt 3.3272 (r 2 = 0.9613). the condition index equation was k = 25.755 e0.004lt (r2 = 0.8925) for females and k=26.767 e0.003lt (r2 =0.907) for males. the mean condition index was 31.29 ±0.55 % for females and 28.52 ± 0.19 % for males. both sexes reached the sexual maturity when the males and females overcame the 20.00 mm and 23.5 mm of lt respectively
Distribución y abundancia de Caiman crocodilus en el Refugio Nacional de Vida Silvestre Ca?o Negro, Costa Rica
Cabrera Pea,Jorge; Protti Quesada,Maurizio; Urriola Hernández,Mario; Cubero Murillo,Rolando;
Revista de Biología Tropical , 2003,
Abstract: the distribution and abundance of a population of caiman crocodilus fuscus were estimated by monthly counting of eyeshines at night, from february 1999 to march 2000 in six transects of río frío in the ca?o negro national refuge (rnvscn), northern costa rica. march was the month with the greatest abundance of caimans observed. the visible fraction of the population (pv2 index) fluctuated between 42.59 % to 54.71 % during the wet season and 35.49 % to 53.93 % in the dry season. the transects of river with greater abundance of caimans were terrón-sabogal and sabogal-playuela. significant differences were determined in the abundance of caimans between transects, except the transects entrada san sebastían-las cubas and las cubas-entrada ca?o los patos and entrada ca?o los patos-terrón and boca sabogal-playuela. the population of estimated brown caiman in this study was 2283.48 ± 313.5. the statistical analysis by seasons did not show significant differences in the number of caimans observed. estimated mean number of caimans per km of river was 74.36 /km for 30.7 km of habitat. the results of this study indicated that the fluctuation in population density during the seasons is attributable to local movements.
Crecimiento y madurez sexual de una población de Saccostrea palmula (Mollusca: Bivalvia), Costa Rica
Cabrera Pea,Jorge H.; Protti Quesada,Maurizio; Urriola Hernández,Mario; Sáenz Vargas,Osvaldo;
Revista de Biología Tropical , 2001,
Abstract: growth and sexual maturity in saccostrea palmula were studied between may 1998 and may 1999, in morales estuary, punta morales, puntarenas, costa rica (n=540 individuals according to sample size equation). the weight-length relationship for the population was pt = 2.13 x 10-2 lt1.6602 and von bertalanffy growth function was lt = 68.2 (1- e -0.1577 t). the mean sex ratio was 1.00 male: 0.92 females with sexually mature individuals found throughout the year. spawning activity was highest between november and january. the mean condition index (ic = pcf/pv x 100) for the population was 121.53 ± 2.24 and the mean meat yield was 10.32 ± 1.64 %
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