三种马鸡的核型及染色体G-带带型

采用外周血淋巴细胞培养和NaOH显带的方法制备了白马鸡、蓝马鸡和褐马鸡的核型与染色体G 带带型。结果表明 :3种马鸡的核型基本相同 ,2n =82 ,有 7对大染色体 ,其余为微小染色体 ;Z染色体为第 4对大染色体 ,W染色体的长度介于第 6、 7对大染色体之间 ;除第 1对大染色体为m型、Z染色体为sm型外 ,其余的染色体均为t型。 3种马鸡染色体G 带带型表现出较明显的差异 ,7对大染色体中 ,有 6对大染色体的G 带带型有差异。利用数值分类学方法计算 3种马鸡G 带带型的相似性系数并进行聚类分析 ,结果表明 ,蓝马鸡与褐马鸡亲缘关系较近 ,二者与白马鸡的亲缘关系较远。

两种鱼类Sox基因保守区的克隆和Sox9基因保守区内含子的遗传变异性

Four different Sox genes in Amur sturgeon Acipenser schrenckii and five Sox genes in chum salmon Oncorhynchus keta were identified for the first time in this paper, and there was no sexual difference for these genes in these two fishes. For Amur sturgeon, the encoded amino acid sequences exhibited 98%, 98%, 98%, 86% of sequence homology with those reported for human SOX HMG box, respectively, and for chum salmon, the encoded amino acid sequences exhibited 93%,98%,98%,98%,96% of sequence homology with those reported for human SOX HMG box, respectively. Two different forms of Sox9 gene in chum salmon were found, and Sox9 contained a 303 bp and 258 bp introns in the HMG box for chum salmon respectively while 572 bp for Amur sturgeon. No clear similarity was observed between the introns in the Sox9 HMG box of different fishes, but the introns occur in the HMG box region between the second and third bases of the codon for arginine at residue 42 in HMG box for the three fishes, and obey the rule of “GT AG”. and the encoded amino acid sequences in the three Sox9 genes HMG box are very conservative in the two fishes (100% identification). Identification of these genes is a potential step in understanding development regulations including sex determination in Amur sturgeon.

发达国家高校教师管理趋势及其启示

在资源日益紧缺的今天,高校教师的管理愈显重要。一些发达国家在高校教学人员管理方面,呈现出管理权力向均权化发展,灵活多样的聘任制,更加和谐的人员比例,评估、激励和职业发展一体化以及法律更加完备的趋势,它为我国的高教管理改革提供了借鉴。

高校教师绩效与晋升

调查发现,除学位和外语水平等硬性约束条件外,岗位晋升主要与科研成果的数量和应聘者的资历有关,科研成果质量对岗位晋升的影响相对较小,课堂教学工作量与岗位晋升之间呈负相关关系。课堂教学工作主要由副教授和讲师承担,教授承担的课堂教学工作量普遍不足。科研产出则呈现出相反的趋势,教授、副教授和讲师的科研产出逐次降少。科研产出的内部差异也较大,少数教授和副教授产出了大多数的科研成果。