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Search Results: 1 - 10 of 220303 matches for " Vasconcellos C "
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Temperature effect on CARBON biomass in soils FROM TROPICAL AND TEMPERATE REGIONS
Vasconcellos, C.A.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000100016
Abstract: four soils from various origins, (tropical and temperate regions) were amended with 14c labelled glucose (1mg c.g-1 soil) and incubated at 15oc and 35oc to determine the temperature effect on the carbon turnover and on the microbial biomass. the temperature effect on the biomass increased with the glucose addition. the biomass mineralization rates were higher at 35oc than at 15oc and higher for woburn and pegwell soils (temperate region) than for capinopolis and janauba (tropical region). specific respiration rate (srr) of new biomass (from glucose) and old biomass showed different behaviors between soils. at 15oc, the turnover c was 207, 225, 115 and 141 days for janauba, capinopolis, woburn and pegwell soil, respectively. at 35oc, it was 92, 69, 69 and 33 days for the same soils. the residual 14c in the soil was higher at 35oc. the final total biomasses at 15oc and 35oc were correlated with the initial soil carbon content. there was an average of 31 and 8 mg of biomass c.g-1 soil organic carbon, respectively at 15oc and 35oc. the initial carbon content was an important factor to explain the mineralization rate at 35oc.
Ensaio gráfico
Cássio Vasconcellos
ARS (S?o Paulo) , 2007, DOI: 10.1590/s1678-53202007000200001
Abstract:
Temperature effect on CARBON biomass in soils FROM TROPICAL AND TEMPERATE REGIONS
Vasconcellos C.A.
Scientia Agricola , 1998,
Abstract: Four soils from various origins, (tropical and temperate regions) were amended with 14C labelled glucose (1mg C.g-1 soil) and incubated at 15oC and 35oC to determine the temperature effect on the carbon turnover and on the microbial biomass. The temperature effect on the biomass increased with the glucose addition. The biomass mineralization rates were higher at 35oC than at 15oC and higher for Woburn and Pegwell soils (temperate region) than for Capinopolis and Janauba (tropical region). Specific respiration rate (SRR) of new biomass (from glucose) and old biomass showed different behaviors between soils. At 15oC, the turnover C was 207, 225, 115 and 141 days for Janauba, Capinopolis, Woburn and Pegwell soil, respectively. At 35oC, it was 92, 69, 69 and 33 days for the same soils. The residual 14C in the soil was higher at 35oC. The final total biomasses at 15oC and 35oC were correlated with the initial soil carbon content. There was an average of 31 and 8 mg of biomass C.g-1 soil organic carbon, respectively at 15oC and 35oC. The initial carbon content was an important factor to explain the mineralization rate at 35oC.
Detección Inmunohistoquímica del Receptor de Estrógeno en el Endometrio de Ovejas de Alta Prolificidad y de Prolificidad Estándar
Vasconcellos C,Adriana; Paredes H,Marco;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000300054
Abstract: a factor that affects the reproductive capacity of sheep is the presence of estrogen receptors in the genital tract, where they regulate the expression of numerous genes involved in morphological and functional development. possibly the reproductive performance of different breeds of sheep could be determined by the differential expression of these receptors. in the present study, we evaluated comparatively level of estrogen receptor expression in endometrial tissue ewe lambs high prolificacy (texel) and standard prolificacy (araucana) by immunohistochemical analysis. it is concluded that the level of estrogen receptor expression in stromal tissue, epithelial lining and endometrial glandular texel sheep is of greater intensity than in ewes araucana, this difference in the expression level of these receptors could be related to the increased prolificacy of texel breed.
Estudio anatomohistológico de la irrigaciónperifoveolar de la cabeza del fémur de un cerdo (Sus scrofa)
del Sol,M.; Veuthey,C.; Vasconcellos,A.;
Archivos de medicina veterinaria , 1998, DOI: 10.4067/S0301-732X1998000200013
Abstract: the irrigation of the perifoveolar region in the femoral head, has been the aim of some anatomo-clinic studies in the belief that it would suffer aseptic necrosis by the section of the ligament from the femoral head and from its relating vessels. in order to clarify the above hypothesis an anatomo-histological study was performed on a 3 months old, 30 kg pig specimen (sus scrofa). this consisted in a surgical sectioning of the femur head ligament and its enclosing arteries, which were also ligated in order to observe nutrition at the perifoveolar head level. after 92 days, with the specimen weigthing 83 kg, it was sacrificed and samples from the ligament and femur head closer to the fovea were taken. it was not possible to observe histopatological alterations or necrosis in the insert area of the ligament of the femoral head and adjacent areas, in the compact bone or in the spongy substances. histological alterations in the articular cartilage were not observed either. instead, a moderate fibrosis at the distal extremity of the ligament in the femoral head was noticed. signs of active mineralization were shown in the bony counterfoil. the side control did not present histopatologic alterations. through this study the irrigation of the femoral head in a pig specimen was proved to be minimal and perhaps non existent
Detección Inmunohistoquímica del Receptor de Estrógeno en el Endometrio de Ovejas de Alta Prolificidad y de Prolificidad Estándar Immunohistochemical Detection of Estrogen Receptor in the Endometriumof Sheep High Prolificacy and Standard Prolificacy
Adriana Vasconcellos C,Marco Paredes H
International Journal of Morphology , 2012,
Abstract: Uno de los factores que incide en la capacidad reproductiva de los ovinos es la presencia de receptores de estrógeno en el tracto genital, donde regulan la expresión de numerosos genes comprometidos en su desarrollo morfológico y funcional. Posiblemente el desempe o reproductivo de diferentes razas de ovejas podría estar determinado por la expresión diferencial de estos receptores. En el presente estudio, se evaluó comparativamente el nivel de expresión del receptor de estrógeno en tejido endometrial de ovejas prepúberes de alta prolificidad (raza Texel) y de prolificidad estándar (raza Araucana) mediante análisis inmunohistoquímico. Se concluye que el nivel de expresión del receptor de estrógeno en tejido estromal, epitelial, de revestimiento y glandular del endometrio de ovejas de raza Texel es significativamente mayor que en ovejas de raza Araucana. Esta diferencia en el nivel de expresión de estos receptores podría estar relacionado con la diferencia de prolificidad entre estas razas. A factor that affects the reproductive capacity of sheep is the presence of estrogen receptors in the genital tract, where they regulate the expression of numerous genes involved in morphological and functional development. Possibly the reproductive performance of different breeds of sheep could be determined by the differential expression of these receptors. In the present study, we evaluated comparatively level of estrogen receptor expression in endometrial tissue ewe lambs high prolificacy (Texel) and standard prolificacy (Araucana) by immunohistochemical analysis. It is concluded that the level of estrogen receptor expression in stromal tissue, epithelial lining and endometrial glandular Texel Sheep is of greater intensity than in ewes Araucana, this difference in the expression level of these receptors could be related to the increased prolificacy of Texel breed.
Estudio anatomohistológico de la irrigaciónperifoveolar de la cabeza del fémur de un cerdo (Sus scrofa) Anatomo-histological study on the perifoveolar irrigation ofthe femur head in pigs (Sus scrofa)
M. del Sol,C. Veuthey,A. Vasconcellos
Archivos de medicina veterinaria , 1998,
Abstract: La irrigación de la cabeza del fémur ha sido motivo de algunos estudios anatomoclínicos, al mencionarse que ella sufriría necrosis aséptica, por la sección del ligamento de la cabeza del fémur y de sus vasos acompa antes (Moore, 1996). De acuerdo a la hipótesis en que la sección del ligamento de la cabeza del fémur junto a sus vasos podría afectar la nutrición perifoveolar de la cabeza, se efectuó un estudio anatomohistológico en un cerdo (Sus scrofa), de 3 meses de edad y 30 kg de peso, al que se seccionó quirúrgicamente el ligamento mencionado y las arterias que lo acompa an, las cuales también fueron ligadas. Después de 92 días y teniendo el cerdo un peso de 83 kg, fue sacrificado y se obtuvieron muestras para microscopia óptica del ligamento y de la cabeza del fémur, próxima a la fóvea. No fue posible observar alteraciones histopatológicas o necrosis aséptica en la zona de inserción del ligamento de la cabeza femoral y zonas adyacentes, tanto en la sustancias ósea compacta como esponjosa. Tampoco se observó alteración histopatológica en el cartílago articular. Fue observada sólo una moderada fibrosis en el extremo distal del ligamento de la cabeza femoral. La matriz ósea mostraba signos de mineralización activa. El lado control tampoco presentaba alteraciones histopatológicas. Este estudio mostró la escasa participación que tienen las arterias acompa antes del ligamento de la cabeza femoral en la irrigación perifoveolar de la cabeza del fémur en el cerdo The irrigation of the perifoveolar region in the femoral head, has been the aim of some anatomo-clinic studies in the belief that it would suffer aseptic necrosis by the section of the ligament from the femoral head and from its relating vessels. In order to clarify the above hypothesis an anatomo-histological study was performed on a 3 months old, 30 kg pig specimen (Sus scrofa). This consisted in a surgical sectioning of the femur head ligament and its enclosing arteries, which were also ligated in order to observe nutrition at the perifoveolar head level. After 92 days, with the specimen weigthing 83 kg, it was sacrificed and samples from the ligament and femur head closer to the fovea were taken. It was not possible to observe histopatological alterations or necrosis in the insert area of the ligament of the femoral head and adjacent areas, in the compact bone or in the spongy substances. Histological alterations in the articular cartilage were not observed either. Instead, a moderate fibrosis at the distal extremity of the ligament in the femoral head was noticed. Signs of active mineralization
Presencia de Receptores de Estrógeno, Progesterona y CBG en el Tracto Genital de Ovejas y Perras: Estudio Inmmunocitoquímico Comparativo
Vasconcellos,C. A.; Sepúlveda,B. N.; Pacheco,C. C.;
International Journal of Morphology , 2006, DOI: 10.4067/S0717-95022006000400026
Abstract: the sexual steroid receptors of the genital tract of the female has importance since on them the hormones responsible for their development and morphofuncional changes act. due that in their control mechanism one of the factors to be kept in mind is the possible differences among the diverse species. the objective of our study was to compare in two different species sheep (o) ( n=6) and canine (p) ( n=6) the presence of receptors of estrogens (re), progesterone (rp) and the presence of cbg in ovary, oviduct and uterus of female prepúberes (o:n=3; pn=·3) and mature: (o:n=3; pn=·3) we use h-e tint and and inmunocito chemistry according to technique of stenberger. the results revealed: in both species of animals during the estral cycle: inmunorreactivity (ri) positive marked for estrogens in uterus, oviduct and ovary being comparatively much more numerous re in dog oviduct that in sheep. in both animals in anestro re was negative or light in uterus, without evidenced of their presence in other organs. the rp varied according to the stage of the cycle not showing remarkables differences among the species. in the prepuber female sheep re and rp were detected while in dogs they were not evidenced. the cbg showed positivity in the tract of both animals during the cycle and it was negative in both prepuber species we concludes that differences exist especially in prepuber female where the presence of re and rp are detectable in sheep and no detectable in dogs, being further the comparatively presence of re in dog oviduct in cycle more marked that in sheep in the same stage.
Presencia de Receptores de Estrógeno, Progesterona y CBG en el Tracto Genital de Ovejas y Perras: Estudio Inmmunocitoquímico Comparativo Presence of Estrogen and Progesterone Receptors and CBG in the Female Tract of Sheep and Dogs: Comparative Immunochemistry Study
C. A. Vasconcellos,B. N. Sepúlveda,C. C. Pacheco
International Journal of Morphology , 2006,
Abstract: Los receptores esteroidales sexuales del tracto genital de la hembra tienen importancia ya que a través de ellos actúan las hormonas responsables de su desarrollo y de sus cambios morfofuncionales. Dado que en su mecanismo de control uno de los factores a tenerse en cuenta son las posibles diferencias entre las distintas especies, los objetivos de nuestro estudio fueron comparar en dos especies distintas la ovina (O) (n=6) y la canina (P) (n=6) la presencia de receptores de estrógenos (RE), progesterona (RP) y de CBG en ovario, tuba uterina y útero de hembras prepúberes (O:n=3; P:n=·3) y adultas (O:n=3; P:n=3). Se realizaron tinción con H-E e inmunocitoquimica según técnica de Stenberger. Los resultados revelaron: en ambas especies en animales durante el ciclo estral inmunorreactividad (IR) positiva marcada para estrógenos en útero, oviducto y ovario siendo comparativamente los RE más numerosos en oviducto de perra que en oveja. En ambos animales en anestro, la IR para RE fue negativa o leve en útero, no evidenciándose su presencia en otros órganos. Los RP variaron según el estadio del ciclo, no mostrando diferencias destacables entre las especies. En las hembras prepúberes de oveja fueron detectados RE Y RP, mientras que en perras éstos no fueron evidenciados. La CBG mostró IR positiva en el tracto de ambos animales durante el ciclo y fue negativa en prepúberes para ambas especies. Se concluye que existen diferencias, especialmente en hembras prepúberes, donde la presencia de RE y RP es detectable en ovejas no así en perras, siendo además, la presencia de RE comparativamente más marcada en tuba uterina de perra en ciclo que en oveja en el mismo estadio The sexual steroid receptors of the genital tract of the female has importance since on them the hormones responsible for their development and morphofuncional changes act. Due that in their control mechanism one of the factors to be kept in mind is the possible differences among the diverse species. The objective of our study was to compare in two different species sheep (O) ( n=6) and canine (P) ( n=6) the presence of receptors of estrogens (RE), progesterone (RP) and the presence of CBG in ovary, oviduct and uterus of female prepúberes (O:n=3; Pn=·3) and mature: (O:n=3; Pn=·3) We use H-E tint and and inmunocito chemistry according to technique of Stenberger. The results revealed: in both species of animals during the estral cycle: Inmunorreactivity (RI) positive marked for estrogens in uterus, oviduct and ovary being comparatively much more numerous RE in dog oviduct that in sheep. In both animals in
Estudio Histomorfológico Comparativo del Endometrio de Ovejas Prepúberes de Razas de Distinta Prolificidad
Vasconcellos C,Adriana; Carrasco R,Johannna; Valdés F,Fernando;
International Journal of Morphology , 2008, DOI: 10.4067/S0717-95022008000100024
Abstract: the aim of the present study was to sit morphological bases for the inmumocitochemical and hybridazion in situ study of the presence and distribution of estrogen and progesterone receptors in sheep of different prolificity and in different nutrition plane, centering our interest in the endometrium for its relevance in the reproductive mechanisms. we used sheep prepuberal romney mash of high prolificity (n=2) and araucanian of standard prolificity(n=2) immediately after slaughter uterine tissue was taken for histhological study from uteri , oviduct and ovary. cross sections were stained with hematoxilina-eosina, van giesson, arteta and periodic acid of schiff (p.a.s.). the results showed in both races a good endometrial development, with caruncular and glandular intercaruncular glandular areas well defined, the later necessary for embryo implantation and growth the numerous, tubular, coiled, glands, extend to the miometrium. no significant histological differences were observed between both races neither morphological changes between days 93 to 117 of post natal life ,being their aspect similar to the endometrium of mature sheep.
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