61 resultados para Odorico, da Pordenone, 1265?-1331.


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Group IIA phospholipase A(2) (PLA(2)) are major components in Viperidae/Crotalidae venom. In the present study, a novel PLA(2) named promutoxin with Arg at the site 49 has been purified from the venom of Protobothrops muerosquamatus by chromatography. It

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热休克蛋白(HSP)是一组在进化上高度保守、具有重要生理功能的蛋白质家族,是生物在应激条件下产生的一种非特异性防御产物,在调节免疫应答和抗病毒反应中起重要作用。现简要介绍HSP70、gp96(HSP96,GRP94)这两种HSP与病毒感染的关系及在抗病毒感染中的作用。

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2005年3~4月,对云南省临沧地区澜沧江自然保护区的鸟类资源进行了调查.通过观察和网捕调查,共计采集记录105种鸟类.结合中国科学院昆明动物研究所鸟类标本室收藏的临沧地区的207种鸟类标本,以及该地区的有关文献资料记录的84种,保护区内共有396种鸟类,隶属55 科(另4亚科)19 目,占云南省所录鸟类种数848种的47%,全国鸟类种数1331种的30%.其中国家一级保护物种2种,二级保护物种39种.保护区内记录的鸟类有留鸟307种,占所录鸟类的78%.区系成分以东洋界物种为主,有292种,占繁殖鸟类总种数的83%.亚区级区系分析表明保护区内的鸟类以滇南山地亚区和西南山地亚区的种类为主,前者成分稍多于后者,说明该地区处于由滇南山地亚区向西南山地亚区过渡的地带.结合该区鸟类垂直分布的特点,提出应加强对原生及次生阔叶林的保护,尤其是对成熟次生林的保护,因为它们对保存该保护区的大多数物种具有重要的价值.

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倒刺鲃属(Spinibarbus)鱼类隶属于鲤科的鲃亚科,共有5个有效种。应用分支系统学原理和方法,对该属鱼类的系统发育和地理分化进行了研究。在进行性状分析时,以四须鲃属(Barbodes)作为倒刺鲃属的外类群,理由是它们的系统发育关系较近,而且四须鲃属较原始。分析结果表明,倒刺鲃属鱼类共有3个共同离征,表明该属鱼类为一个单源群。在19个外部形态和内部骨骼特征的基础上,构建了倒刺鲃属鱼类的系统发育分支图。姐妹群A(S.hollandi)和 B-E(S.sinensis+S.denticulatus+S.yunnanensis+S.polyepis)代表了倒刺鲃属内的第一次谱系分化。第二次谱系分化发生于姐妹群B(S.sinensis)和C-E(S.dentlculalus+S.yunnanensis+S.polylepis)之间;姐妹群B分布于长江水系,而姐妹群C-E则分布于珠江水系以南,包括海南岛;基于谱系分化和姐妹群的地理分布,推测此次谱系分化可能是由于云贵高原的抬升及同时发生的水系分流所致。第三次谱系分化则发生于姐妹群C(S.denticulalus)和D-E(S.yunnanensis+S.polyle...

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对鲢、鳙单倍体和二倍体单个囊胚胚胎进行培养,结果表明,单倍体和二倍体细胞对培养条件的要求相差不大,其原代培养细胞的生长特点表现为新生细胞主要沿着组织块边缘重叠生长,向外扩展生长的速度非常缓慢,二倍体的鲢和鳙胚胎细胞培养物成活率相对高于单倍体,其中鲢二倍体胚胎细胞传代细胞占细胞培养数的18.06%。本结果对深入开展鲢、鳙核移植及胚胎干细胞研究具有积极意义。

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Fifteen polymorphic microsatellite loci were developed for the Chinese soft-shelled turtle (Pelodiscus sinensis) from the (GT)(n) microsatellite-enriched genomic library, using the fast isolation by amplified fragment length polymorphism of sequences containing repeats protocol. The polymorphism of all 15 loci ranged from two to seven alleles with observed heterozygosities ranging from 0.03 to 0.98 (mean 0.43) in one population of 40 individuals. These novel loci will be helpful for understanding the population structure at genetic level and marker-assisted breeding of this vulnerable species.

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A novel broadband superluminescent diode (SLD), which has a symmetric graded tensile-strained bulk InGaAs active region, is developed. The symmetric-graded tensile-strained bulk InGaAs is achieved by changing the group III TMGa source flow only during its growth process by low-pressure metalorganic vapor-phase epitaxy (LP-MOVPE), in which the much different tensile strain is introduced simultaneously. At 200mA injection current, the full width at half maximum (FWHM) of the emission spectrum of the SLID can be up to 122nm, covering the range of 1508-1630nm, and the output power is 11.5mW.

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普适计算是“后PC”时代的产物 ,正在深刻地影响着计算机科学的许多方面 针对有线普适视频领域 ,从“分子化合”的思维角度出发 ,提出了分子化服务思想 ,并构建了分子化服务体系结构模型 ,继而提出了保证视频服务分子协同工作的差错控制算法 实验证明这一差错控制算法是有效的 ,基于分子化服务思想的有线普适视频服务模型也是可行的 ,并且能够有效降低普适设备的系统负载 .

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本文主要介绍正在盛行研究的脉冲管制冷机的原理、结构、现状以及应用前景

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本文概述了我国热泵技术-电动压缩式、热驱动吸收式和电、热驱动相结合的吸收压缩复合式热泵的研究现状和应用情况,指出存在的问题以及以后发展方向,技术政策。