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Id: lil-728281
Autor: Wang, Jinbao; Li, Haiyan; Zhang, Lu; Zhang, Yuan; Yue, Mingxia; Shao, Baoping; Wang, Jianlin.
Título: Histomorphometric characterization of forestomach of yak (Bos grunniens) in the Qinghai-Tibetan Plateau / Caracterización histomorfométrica del preestómago del yak (Bos grunniens) en la Meseta Qinghai-Tíbet
Fonte: Int. j. morphol;32(3):871-881, Sept. 2014. ilus.
Idioma: en.
Projeto: International Cooperation Program of Gansu province; . National Natural Science Foundation of China.
Resumo: Six forestomachs of yaks (Bos grunniens) were studied with gross dissection and histological methods. It was found that the forestomach of yak consisted of the following three parts, rumen, reticulum and omasum, which were composed of the mucosa, submucosa, muscularis and serosa. In addition, the mucosal epithelium was covered with stratified squamous epithelium, with part of keratinized the shallow cells. Rumen, the mucosa of which formed ligulate papillae varying in size and shape, was no muscularis mucosa. Reticulum, consisted of a surface epithelium that invaginated to various extent into the lamina propria, formed various folds in shape, namely, grid-like small rooms. Furthermore, there are many secondary folds densely covered with keratinized papillae. The most striking feature of the omasum was to be formed the laminae omasi varying in length, with short and rough papillae distributing on both sides. Taken together, there was no glands within the mucosa and lamina propria of forestomach of yak, where diffuse lymphoid tissues can be observed clearly. It is, therefore, believed that the yak forestomach may have evolved those specific structural characteristics in response to the unique living environment and dietary habits impose on the Qinghai-Tibetan Plateau.

Seis preestómagos de yaks (Bos grunniens) fueron estudiados mediante disección macroscópica y métodos histológicos. Se encontró que el preestómago del yak constaba de tres partes: rumen, retículo y omaso, compuestas de mucosa, submucosa, muscular y serosa. Además, el epitelio de la mucosa se conformó con epitelio escamoso estratificado, con parte de células cornificadas superficiales. En el rumen, la mucosa formó papilas linguladas que variaron en tamaño y forma. El retículo, consistió en una superficie epitelial que se invaginó en distinta medida en la lámina propia, conformando varias formas de pliegues, es decir, cuadrículas como pequeños cubículos. Además, existían muchos pliegues secundarios densamente cubiertos con papilas cornificadas. La característica más llamativa del omaso, fue formar láminas que variaron en longitud, con papilas cortas y ásperas distribuidas en ambos lados. Tomados en conjunto, no hubo glándulas dentro de la mucosa y la lámina propia del preestómago del yak, donde los tejidos linfoides difusos se pueden observar claramente. Por lo tanto, creemos que esas características estructurales específicas del preestómago del yak pudieron haber evolucionado en respuesta a las condiciones de vida únicas y hábitos dietéticos que se presentan en la meseta de Qinghai-Tíbet.
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-895542
Autor: Zhu, Hongyun; Zhang, Hui; Wang, Yajing; Ciren, Danba; Dong, Hailong; Wu, Qingxia; Rehman, Mujeeb Ur; Nabi, Fazul; Mehmood, Khalid; Li, Jiakui.
Título: Phylogenetic and pathotypic characterization of newcastle disease virus in Tibetan chickens, China
Fonte: Pesqui. vet. bras = Braz. j. vet. res;38(1):37-40, Jan. 2018. tab, graf.
Idioma: en.
Projeto: National Natural Science Foundation of China.
Resumo: Chickens are considered to be potential reservoirs of Newcastle disease virus (NDV). In this study, six Newcastle disease virus strains were isolated and characterized in Tibetan chickens. The HN gene was sequenced, and phylogenetic relationship to reference strains was studied. The phylogenetic analysis demonstrated that these six isolated strains were closely related to NDV isolates of the reference strains GQ245823, KT002186, KU527561, KJ563939, AY225110, EU305607, KM056357, Y18898, GQ245832, AF077761 and lasota strain. Among them, EU305607, KJ563939 and KM056357 were isolated from India, while lasota strain came from attenuated vaccine widely used in China. Then, mean death time (MDT) and intracerebral pathogenicity index (ICPI) were used to estimate the pathogenicity of the isolates. Pathogenicity experiment showed HNH1 and HN17 to be virulent. Our results indicated that genetically diverse viruses circulate in Tibetan chickens, and based upon the phlogeographic analysis, we estimated the origin of ancestral viruses of the isolates and its sister strains located in India and China (lasota strain). It indicates the importance of continuous surveillance to enhance current understanding of the genetic evolution of the NDV strains.(AU)
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Id: lil-638785
Autor: Zhu, Lei.
Título: Craniometrical studies on the skull of Tibetan gazelle (Procapra Picticaudata) / Estudios craneométricos en el cráneo de la gacela del Tibet (Procapra Picticaudata)
Fonte: Int. j. morphol;30(1):196-198, mar. 2012. ilus.
Idioma: en.
Projeto: Qujing Normal University. Scientific Research Foundation.
Resumo: A total of 10 skulls of Tibetan gazelle were utilized in this study. Craniometric measurements for 22 different parts of the skull were made. Skull indices and ratios were calculated. A skull index of 43.22+/-0.44, a cranial index of 58.37+/-0.80 and a facial index of 116.37+/-1.24 were obtained.

Un total de 10 cráneos de gacela tibetana se utilizaron en este estudio. Mediciones craniométricos para 22 diferentes partes de los cráneos fueron realizadas. Los índices craneales y sus razones fueron calculadas. Un índice de cráneo de 43,22 +/- 0,44, un índice craneal de 58,37 +/- 0,80 y un índice facial de 116,37 +/- 1,24 se obtuvieron.
Responsável: CL1.1 - Biblioteca Central


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Id: lil-432706
Autor: Feng, Zong-Yun; Zhang, Li-Li; Zhang, Yi-Zheng; Ling, Hong-Qing.
Título: Genetic diversity and geographical differentiation of cultivated six-rowed naked barley landraces from the Qinghai-Tibet plateau of China detected by SSR analysis
Fonte: Genet. mol. biol;29(2):330-338, 2006. tab.
Idioma: en.
Resumo: Cultivated six-rowed naked barley (Hordeum vulgare ssp. hexastichon var. nudum Hsü) is the oldest cultivated barley in China. We used 35 simple sequence repeat (SSR) markers selected from seven barley linkage groups to study the genetic diversity, geographical differentiation and evolutionary relationships among 65 H. vulgare ssp. hexastichon landrace accessions collected from the Qinghai-Tibet plateau of China, 25 accessions from Tibet (TB), 20 from Qinghai (QH) and 20 from Ganzi (GZ) prefecture in Sichuan province. At the 35 SSR loci we identified 248 alleles among the 65 accessions, 119 (47.98 percent) of the alleles being common alleles. We also found that the TB accessions possessed 47 private alleles, about 1.5 times more than the 31 private alleles found in the QH accessions and about 5 times more than 9 private alleles found in the GZ accessions. Generally, the TB accessions showed significantly higher genetic diversity than either the QH or GZ accessions whereas no significant difference in genetic diversity was found between the QH and GZ accessions. Partitioning analysis of genetic diversity showed that about 81 percent of the total variation was due to within-subgroup diversity and about 19 percent was clearly accounted for by geographical differentiation among the three subgroups. The distributions of alleles for most loci (71.4 percent) were significantly different among the three subgroups and geographical differentiation could be found according to the distribution of SSR alleles. Cluster analysis indicated that most of the accessions could be clustered into groups which basically coincided with their geographical distribution. These results suggest that Tibet might be a center of genetic diversity for cultivated barley, the cultivated six-rowed naked barley on the Qinghai-Tibet plateau of China may have evolved in Tibet and spread to Qinghai and then to Ganzi prefecture of Sichuan province.
Responsável: BR26.1 - Biblioteca Central



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