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Search Results: 1 - 10 of 17778 matches for " Eleazar Ruiz Campos "
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Crecimiento y ciclo reproductivo de Polymesoda radiata (Bivalvia:Corbiculidae) en Costa Rica
Ruiz Campos,Eleazar; Cabrera Pe?a,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 Pe?a,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 Pe?a,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 Pe?a,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.
Padr es Setoriais de Inova o na Indústria Brasileira
Bruno Campos,Ana Urraca Ruiz
Revista Brasileira de Inova??o , 2009,
Abstract: The article aims investigate features of the technical change in Brazilian industry. Theliterature related to sectoral patterns of innovation is utilized as theoretical framework, whereashierarchical and non-hierarchical clustering analyses are used as methodological resource.Utilizing the Industrial Survey of Technological Innovation (PINTEC 2000) of the BrazilianGeography and Statistics Institute (IBGE) will be analyzed five features of the industrialtechnological innovation: the innovative sources, the knowledge and learning processes, thetechnological trajectories, the innovative outputs, and the market structure/performance.The results show that intersectoral diversity cannot be neglected to understand the innovativeperformance of Brazilian industry. Although some specificities, the innovative conduct ofBrazilian industrial sectors are coherent with the international literature.
Una especie nueva de Ipomoea (Convolvulaceae), de los estados de Guanajuato, Hidalgo y Querétaro, México
Eleazar Carranza González,Sergio Zamudio Ruiz,Guillermina Murguia Sánchez
Acta botánica mexicana , 1998,
Abstract: Se describe Ipomoea rzedowskii de los estados de Guanajuato, Hidalgo y Querétaro, como una especie nueva para la ciencia. El nuevo taxon es un arbusto de flores blancas que crece en matorrales xerófilos, en algunas barrancas al este de Xichú y en los ca ones de los ríos Estórax, Moctezuma y Tolimán. Por sus características se ubica en la serie Arborescentes.
Albert Renold Memorial Lecture: Molecular Background of Nutritionally Induced Insulin Resistance Leading to Type 2 Diabetes – From Animal Models to Humans
Eleazar Shafrir
Experimental Diabetes Research , 2001, DOI: 10.1155/edr.2001.299
Abstract: Albert Renold strived to gain insight into the abnormalities of human diabetes by defining the pathophysiology of the disease peculiar to a given animal. He investigated the Israeli desert-derived spiny mice (Acomys cahirinus), which became obese on fat-rich seed diet. After a few months hyperplasia and hypertrophy of β-cells occurred leading to a sudden rupture, insulin loss and ketosis. Spiny mice were low insulin responders, which is probably a characteristic of certain desert animals, protecting against insulin oversecretion when placed on an abundant diet. We have compared the response to overstimulation of several mutant diabetic species and nutritionally induced nonmutant animals when placed on affluent diet. Some endowed with resilient β-cells sustain long-lasting oversecretion, compensating for the insulin resistance, without lapsing into overt diabetes. Some with labile beta cells exhibit apoptosis and lose their capacity of coping with insulin resistance after a relatively short period. The wide spectrum of response to insulin resistance among different diabetes prone species seems to represent the varying response of human beta cells among the populations. In search for the molecular background of insulin resistance resulting from overnutrition we have studied the Israeli desert gerbil Psammomys obesus (sand rat), which progresses through hyperinsulinemia, followed by hyperglycemia and irreversible beta cell loss. Insulin resistance was found to be the outcome of reduced activation of muscle insulin receptor tyrosine kinase by insulin, in association with diminished GLUT4 protein and DNA content and overexpression of PKC isoenzymes, notably of PKCε. This overexpression and translocation to the membrane was discernible even prior to hyperinsulinemia and may reflect the propensity to diabetes in nondiabetic species and represent a marker for preventive action. By promoting the phosphorylation of serine/threonine residues on certain proteins of the insulin signaling pathway, PKCε exerts a negative feedback on insulin action. PKCε was also found to attenuate the activity of PKB and to promote the degradation of insulin receptor, as determined by co-incubation in HEK 293 cells. PKCε overexpression was related to the rise in muscle diacylglycerol and lipid content, which are prevalent on lascivious nutrition especially if fat-rich. Thus, Psammomys illustrates the probable antecedents of the development of worldwide diabetes epidemic in human populations emerging from food scarcity to nutritional affluence, inappriopriate to their metabolic capacity.
Non heart-beating donors in England
Chaib, Eleazar;
Clinics , 2008, DOI: 10.1590/S1807-59322008000100020
Abstract: when transplantation started all organs were retrieved from patients immediately after cardio-respiratory arrest, i.e. from nonheart-beating donors. after the recognition that death resulted from irreversible damage to the brainstem, organ retrieval rapidly switched to patients certified dead after brainstem testing. these heart-beating-donors have become the principal source of organs for transplantation for the last 30 years. the number of heart-beating-donors are declining and this is likely to continue, therefore cadaveric organs from non-heart-beating donor offers a large potential of resources for organ transplantation. the aim of this study is to examine clinical outcomes of non-heart-beating donors in the past 10 years in the uk as an way of decreasing pressure in the huge waiting list for organs transplantation.
Contribution of animal models to the research of the causes of diabetes
Eleazar Shafrir
World Journal of Diabetes , 2010,
Abstract: In most publications, animal models of diabetes have mainly been investigated for their multiple etiologies as well as for changes leading to diabetes and their genetic derivation. Aspects which seem important and need a special research endeavor are the mechanism of the causes of diabetes and the lapse into complications in different species, their molecular basis and possible arrest and prevention. A concise list and and short discussion of the intensively studied rodents is presented of spontaneous or nutritional background causing Type 2 diabetes but omitting diabetes evoked by transgenic manipulations or gene knockout techniques.
The transmission of Rabbi Moses Arragel: Maqueda, Paris, London
Gutwirth, Eleazar
Sefarad : Revista de Estudios Hebraicos y Sefardíes , 2003,
Abstract: Rabbi Moshe Arragel and other scholars composed in the years 1422-30/33 the Arragel Bible. It is an extensive work that includes several texts in at least five different genres, as well as more than three hundred illuminations. Scholarly research on this medieval codex has been carried out now for more than one century. It is therefore possible today to analyse and investigate some of the factors that define its particularities, traditions and changes. Political interests, institutional or scholarly traditions and technological changes are factors that determine this kind of studies. Attention is drawn to: a) issues of technological reproduction (photolithography or facsimile industry) in determining criticism, and b) the role played by institutions (such as the Roxburghe Club) in the making of knowledge. La Biblia de Arragel es el resultado del trabajo de Rabbi Moshe Arragel y de otros durante el periodo 1422-30/33. Se trata de un códice extenso que incluye textos en al menos cinco géneros diferentes, así como más de trescientas miniaturas. La investigación sobre esta obra medieval tiene ya más de un siglo. Hoy en día, por tanto, es posible analizar esta historia e indagar acerca de algunos de los factores que determinan sus peculiaridades, tradiciones y cambios. Apropiaciones políticas, tradiciones institucionales o disciplinarias, y cambios tecnológicos son factores que determinan esta clase de estudios. Así, además de se alar algunos aspectos relevantes de la historia de la investigación, se presta también atención a: a) el problema de la relación entre crítica y tecnologías de reproducción (fotolitografía, industria del facsímil); y b) el marco institucional (historia del Roxburghe Club) y su papel en la producción del saber.
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