淮南地区粉螨群落结构及其多样性

在淮南地区仓储、人居、工作、野外4类生境中采集粉螨样本,行分离、镜检,共检获粉螨3 650头,隶属于7科20属,共32种。结果表明,其物种数S、丰富度指数R、多样性指数H′排序均为仓储环境>野外环境>人居环境>工作环境,野外环境中粉螨群落的均匀度指数最大,工作环境中粉螨的优势度指数最大。工作和野外环境的群落相似性指数最低,达到极度不相似水平。结果表明,粉螨群落的结构及多样性与其生境条件直接相关,人类活动是较为重要的影响因素。     

一类具有阶段结构的传染病模型的全局分析

通过建立一类具有阶段结构的传染病模型,得到了系统解的永久持续性,并通过构造Liapunov函数和定性分析得到了各类平衡点的全局稳定性的充分条件.     

小蠹虫对针叶类寄主树木的选择危害机制

小蠹虫对寄主植物的选择是一个非常复杂的过程,也是近年来小蠹虫生态学研究的一个热门话题。文章对国内外小蠹虫寄主搜寻、寄主识别,以及适宜寄主选择等机制等方面的最新研究成果进行了系统报道。     

天胡荽的组织培养

1植物名称 天胡荽（Hydrocotyle sibthorpioides Laiil．）,别名满天星、破铜钱、落得打。 2材料类别 当年生的顶芽、茎段和叶片。     

Study on Tandem Repeat Sequence Variation in Sheep mtDNA D-loop Region

The 75-nt-long tandem repeat sequence in the control region of mtDNA of 77 individuals, of which 69 were from different indigenous sheep breeds in China and 8 were from imported breeds, was sequenced and analyzed to investigate the origin and differentiation of Chinese indigenous sheep breeds and also the genetic diversities and relationships among them. A total of 28 variable sites were detected within 309 repeated sequences, among which 7 sites were singleton variable sites with two variants, 1 site was a singleton variable site with three variants, and 20 sites were parsimony informative sites with two variants. A total of 63 haplotypes were sorted from 28 polymorphic sites, among which two main and basic haplotypes, namely, Hap 1 and Hap 3 were present at a much higher proportion, at 12.94% and 30.42%, respectively. It could be inferred that Chinese indigenous sheep breeds originated from two maternal ancestors because of the maternal inheritance characteristics of the mtDNA. Altay sheep and Kazakstan sheep are closely related and do not differentiate significantly. Mongolian sheep and Ujumuqin sheep also share a close relationship. Tibetan sheep, Mongolian sheep, and Ujumuqin sheep have lower genetic diversity than Altay sheep and Kazakstan sheep.     

酵母表达系统在植物功能基因组学研究中应用的局限性

介绍了酵母表达体系在植物的功能基因组学研究中的应用,并对这一实验手段应用的局限性进行了分析,以期提醒研究者应全面理解采用这一体系所获得的实验数据,确保据此而作出的结论全面、可靠。     

中国GALEATUS属群记述(半翅目,网蝽科)

Galeatus属群(=Péricart(1983)的"Galeatus-Hyalochiton"属群)在中国有4个属,即南网蝽属AconchusHorváth、贝肩网蝽属Dulinius Distant、贝脊网蝽属Galeatus Curtis和明网蝽属Habrochila Horváth.描述贝脊网蝽属1新种:高冠贝脊网蝽,新种Galeatus trevius Li,sp.nov;系统记述Galeatus属群的中国种类4属10种,即:广南网蝽Aconchus urbanus(Horváth)、北贝肩网蝽Dulinius conchatus Distant、短贝脊网蝽Galeatus affinis(Herrich-Schaeffer)、长贝脊网蝽Galeatus spinifrons(Fallén)、膜贝脊网蝽Galeatusinermis(Jakovlev)、闽贝脊网蝽Galeatus scitulus Drake and Maa、瘤贝脊网蝽Galeatus clara Drake和华明网蝽Habrochila chinensis Drake;描述了4个属的属征、研究历史与分类概况,详细列举了检视标本、寄主和各个种的分布,同时提供了Galeatus属分种检索表和8幅形态图.