73 resultados para 132-810A


Relevância:

10.00% 10.00%

Publicador:

Resumo:

在分析的36种血液蛋白(酶)共计40个遗传座位中, 徐闻黄牛和海南黄牛有相同的13个多态座位, 荷斯坦牛有11个多态座位。徐闻黄牛和海南黄牛的多态座位百分比均为P=0.325, 徐闻黄牛的平均杂合度H=0.141, 海南黄牛的平均杂合度H=0.132; 荷斯坦牛的多态座位百分比P=0.275, 平均杂合度H=0.0099, 研究结果表明这3个品种的遗传多样性相当丰富, 多态座位百分比和平均杂合度随着品种选育程度的提高而降低。研究结果为把徐闻黄牛和海南黄牛合称为雷琼黄牛的观点提供了佐证。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

An unusual highly functionalized lactarane sesquiterpene, named velleratretraol (1), was isolated from the ethanol extract of the fruiting body of the mushroom Lactarius vellereus. Its structure was determined through spectroscopic analysis and single-cry

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The hemizona assay (HZA) in Rhesus monkeys was employed to study the correlation of zona-binding ability with sperm motility or with naturally developing oocytes at various maturational stages. Oocytes from unstimulated ovaries were retrieved within 2 hr from monkeys sacrificed for vaccine production (in reproductive season, but with their menstrual cycles not determined). Oocytes were divided into four groups based on their morphological maturation: 1) Oocytes surrounded by more than one cumulus layer (MC); 2) Oocytes retaining intact germinal vesicle nuclei (GV); 3) Oocytes with germinal vesicle breakdown showing distinct perivitelline space (PVS); and 4) Oocytes extruding the first polar body (PB1). The mean numbers of sperm bound to hemizona for PBI, PVS, GV, and MC groups were 132.9 +/- 12.0, 71.5 +/- 10.1, 36.1 +/- 4.0, and 20.1 +/- 2.9 (Mean +/- SE), respectively. The four groups showed significant differences from each other in sperm/egg binding ability (P < 0.01). The number of bound sperm significantly increased with oocyte maturation. The present study also showed that zona-binding ability was also affected by sperm motility. For sperm with 67.7% motility and sperm with 31.2% motility, the average numbers of bound sperm were 43.5 +/- 2.2 and 25.3 +/- 2.9 (Mean +/- SE), respectively. There was significantly higher binding ability for sperm with higher motility (P < 0.01). The results suggest that: 1)The rhesus monkey model can serve as a very sensitive model for studying sperm/egg interaction by HZA; 2) Sperm motility positively correlated with sperm/egg binding; and 3) Sperm/egg binding ability increases with oocyte maturation. The binding ability is highest when oocytes matured to the PB1 stage, which is also the best opportunity for fertilization. This is strong evidence for the ''zona maturation'' hypothesis. (C) 1994 Wiley-Liss, Inc.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

】目的探讨皮质酮复合异丙肠对大鼠海马区锥体神经元产生的长时程抑俐的影响。方法制备私大鼠初。阿厚度的海马脑片, 随机分为组对照组、脂肪乳剂组、异丙酚组、皮质酮组、皮质酮十异丙酚组。对照组不加任何药物, 脂肪乳剂组、异丙酚组、皮质酮组、皮质酮十异丙酚组分别以拌几脂肪乳剂、拼异丙酚、严田司皮质酮、拌口皮质附复合卿心异丙酚预孵脑片, 然后给予低颇刺激, 记录工的表达情况。结果各组海马区锥体神经元给予公后, 都产生, 与对照组相比, 脂肪乳剂组给予邢后一班犯值没有明显变化, 异丙酚组、皮质酮组和皮质酮异丙酚组给予玲后一的犯值明显降低 , 且皮质用十异丙酚组给予后面兴奋性突触后电流与异丙酚组和皮质翻组相比, 差异有统计学惫义。摘论户异丙酚或件即皮

Relevância:

10.00% 10.00%

Publicador:

Relevância:

10.00% 10.00%

Publicador:

Resumo:

1984—1988年共抚育仔猴578只, 离乳龄为4个月, 抚育一年的成活率为91.5% 。抚育一年内死亡的仔猴中有61.8%发生在离乳后第一个月内,2月龄以下离乳的 仔猴有20%死亡, 2月龄以上为6.9%; 64.7%的仔猴死亡于肺炎和肠道炎。人工离 乳的仔猴, 雄性在10月龄前、雌性在9月龄前具有较快的生长速度, 仔猴提前离 乳, 能提高母猴的生育力。图4表4参9

Relevância:

10.00% 10.00%

Publicador:

Resumo:

对茶茸毒蛾进行了形态特征研究,包括从卵、幼虫、蛹、成虫各个发育时态的形态特征;成虫的头、胸、腹、腿、翅脉的特征,特别是外生殖器的结构和形态特征作了描述并附了特征图。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

At present, acute vascular rejection (AVR) remains a primary obstacle inhibiting long-term graft survival in the pig-to-non-human primate transplant model. The present study was undertaken to determine whether repetitive injection of low dose Yunnan-cobra venom factor (Y-CVF), a potent complement inhibitor derived from the venom of Naja kaouthia can completely abrogate hemolytic complement activity and subsequently improve the results in a pig-to-rhesus monkey heterotopic heart transplant model. Nine adult rhesus monkeys received a heterotopic heart transplant from wild-type pigs and the recipients were allocated into two groups: group 1 (n = 4) received repetitive injection of low dose Y-CVF until the end of the study and group 2 (n = 5) did not receive Y-CVF. All recipients were treated with cyclosporine A (CsA), cyclophosphamide (CyP) and steroids. Repetitive Y-CVF treatment led to very dramatic fall in CH50 and serum C3 levels (CH50 < 3 units/C3 remained undetectable throughout the experiment) and successfully prevented hyperacute rejection (HAR), while three of five animals in group 2 underwent HAR. However, the continuous suppression of circulating complement did not prevent AVR and the grafts in group 1 survived from 8 to 13 days. Despite undetectable C3 in circulating blood, C3 deposition was present in these grafts. The venular thrombosis was the predominant histopathologic feature of AVR. We conclude that repetitive injection of low dose Y-CVF can be used to continuously suppress circulating complement in a very potent manner and successfully prevent HAR. However, this therapy did not inhibit complement deposition in the graft and failed to prevent AVR. These data suggest that using alternative pig donors [i.e. human decay accelerating factor (hDAF)-transgenic] in combination with the systemic use of complement inhibitors may be necessary to further control complement activation and improve survival in pig-to-non-human primate xenotransplant model.

Relevância:

10.00% 10.00%

Publicador:

Relevância:

10.00% 10.00%

Publicador: