蓝氏贾第虫分离株tim 基因序列分析比较研究

　为了探讨来源于不同地理位置贾第虫分离株之间的遗传学关系, 采用tim 基因扩增、限制性酶切和 DNA 序列分析方法对来自我国(C1、C2、、CH2、CH3)、柬埔寨(CAM )、澳大利亚(A 1、A 2) 和美国(BP、CDC) 共9 株 蓝氏贾第虫的基因型进行了分析比较。结果表明,A 1、A 2 和CAM 属第1 型(WB) ; CH2 和CH3 属第2 型(JH) ; C1、 C2、BP 和CDC 属第3 型(GS)。本实验结果提示, 虫株间遗传学关系并非由地理位置的远近所决定。来源于同一地 理位置的虫株其遗传学特性可有很大的差异。相反, 来源于地理位置相隔很远的虫株其遗传学特性却可极为相近。 贾第虫分离株基因型的确定可为本虫分子系统进化和分子流行病学研究提供重要资料。

Trial by market: the Brightstar incubation experiment

Established firms accumulate a significant body of knowledge, expertise and capabilities that are often secondary to their central revenue generating activities. How do they leverage this expertise in non-core technology into future value creation opportunities? In this paper we examine an attempt by the telecommunications firm BT to create value from the accumulated knowledge within its laboratories by setting up an incubator. While conceived by the board as a mechanism for leveraging the value of non-core technology into the workplace, corporate support for the incubator was withdrawn after only three years and prompted the incubator to partner with a venture capital firm, NVP, in the spin-out of ventures. Through analysis of this single case we observe how entering into such a relationship reduces the transaction costs of accessing complementary resources, capabilities and competences, while simultaneously reducing a number of the risks associated with venturing for both parties. Partnering with the venture capitalist allows the established firm to get its intellectual property into the market, for it to be tested by the market and further developed. © 2010 Inderscience Enterprises Ltd.

独龙牛遗传多样性及其种群遗传结构的等位酶分析

用水平切片淀粉凝胶电泳技术, 进行30头独龙牛41种蛋白质共计44个遗传座位的等位酶分析,只在Tf、Hp、Amy、Est等4个座位发现多态性。每个座位等位基因的平均数、多态座位百分 比和平均杂合度值分别为A=1.0909、P=0.0682和H=0.0262。贡山县和福贡县独龙牛群体从酶基因的角度上看遗传多样性贫乏, 可能是分别由小种群引种而来, 受到瓶颈效应的作用, 并伴随着创立者事件的发生。表3参12

中国大白蚁亚科壤白蚁新属新种(等翅目:白蚁科)

壤白蚁属 Parahypotermes Zhu et Huang, 新属模式种: 曼允壤白蚁Parahy potermes manyunensis, 新种. 属征: 兵蚁头近卵圆形, 头背面被毛稀少, 两侧缘于触角前骤然狭缩, 头中部最宽, 后缘宽圆, 头背面中部明显隆起; 左上颚内缘中部第1缘齿上方具2—3枚小齿. 比较与讨论: 本新属与地白蚁属 Hypotermes Holmgren 较接近. 但 Hypotermes 头两侧缘触角前不呈狭缩状; 左上颚第1缘齿上方不具锯齿状小齿; 头背面中部呈弧状隆起。

Performance of thin film carbon materials and carbon nanotubes as cold cathodes

The field emissions from three different types of carbon films are studied using a Kiethly voltage-current source-measure unit under computer control. The three types of carbon films are : 1) a-C:H:N deposited using an inductively coupled rf PECVD process, where the N content in the films can be as high as 30 at %; 2) cathodic arc deposited tetrahedral amorphous carbon with embedded regions of carbon nanotube and anion structures and 3) unoriented carbon nanotube films on a porous substrate. The films are formed by filtering a solution of nanotubes dispersed in alcohol through the pores and drying.

进化观点与有机结构进化的根本问题——谨以此文悼念中国自然辩证法研究会前秘书长查汝强先生

1.生物体内的一切有机结构及其所进行的生命活动过程全都是进化的产物. 生命在本质上就是跟进化密不可分的. 因此, 进化的观点在一切生物学领域都是普遍有效的, 包括细胞生物学和分子生物学. 从进化的观点进行考察, 是进一步发展细胞生物学以至分子生物学的一条新的必然的道路, 即进化细胞生物学的道路. 2.该文结合有机结构的层次性分析了有机结构的结构体制、其所进行的生命活动的活动机理与它们所承担的机能任务三者之间的内在联系. 3.有机结构与其生命活动过程的进化的动力源泉, 在于它们与其所承担的机能任务之间的矛盾。

云南黑颈长尾雉(Syrmaticus humiae)分布及栖息地类型调查

黑颈长尾雉是鸡形目鸟类中的濒危物种,分布局限于印度东北部、缅甸北部、泰国西北部和中国西南部。在中国,该雉仅栖息于广西西部和云南中部、西部及南部地区。1992年至1995年在云南对黑颈长尾雉的分布及栖息生境进行了专门的调查,共有13县18个地点记录到黑颈长尾雉分布。通过访问还获得一些可能有黑颈长尾雉分布但需进一步证实的地点。黑颈长尾雉在云南的栖息生境主要有热带季雨林、亚热带常绿阔叶林、暖温性针叶林、暖热性针叶林和落叶阔叶林等5种类型。栖息地丧失和高强度狩猎是导致黑颈长尾雉濒危的主要原因。

Response probability distribution of built-up vibro-acoustic systems

The vibro-acoustic response of built-up structures, consisting of stiff components with low modal density and flexible components with high modal density, is sensitive to small imperfections in the flexible components. In this paper, the uncertainty of the response is considered by modeling the low modal density master system as deterministic and the high modal density subsystems in a nonparametric stochastic way, i.e., carrying a diffuse wave field, and by subsequently computing the response probability density function. The master system's mean squared response amplitude follows a singular noncentral complex Wishart distribution conditional on the subsystem energies. For a single degree of freedom, this is equivalent to a chi-square or an exponential distribution, depending on the loading conditions. The subsystem energies follow approximately a chi-square distribution when their relative variance is smaller than unity. The results are validated by application to plate structures, and good agreement with Monte Carlo simulations is found. © 2012 Acoustical Society of America.