Studies on the Pollen Morphology of Trapa from Zhejiang

In the present work, pollen grains of 9 species of Trapa L. from Zhejiang were examined under LM and SEM. They are subsphaeroidal or subprolate, obtuse-triangular in polar view, elliptic or subrounded in equatorial view, and 3-colpate. In the equatorial area, there are three ridge-shaped appendages which elongates along apertures toward two poles and ultimately combined, the ornamentation of other part of exine is minute-verrucate. The genus Trapa is uniform in shape of pollen grains, type and position of apertures and ornamentation of exine, while differentiation can be found in size of pollen grains and shape of ridge-shaped appendage. All of these provide valuable evidence for the classification of Trapa and the verification of their affinities. The validity of Trapaceae, the evolutionarytrends of pollen morphology and the affinities of some species are discussed in this paper.     

西藏昆仑针茅草原的基本特征

正昆仑针茅(Stipa roborowskyi)是青藏高原特有的寒旱生多年生密丛型禾草,广泛分布于藏南喜马拉雅山北坡和雅鲁藏布江谷地、阿里地区、羌塘高原中南部和昆仑山地,以及印度和克什米尔地区(Wu et al.,2006;中国科学院中国植被图编辑委员会,2007)。昆仑针茅草原是西藏重要的草原类型之一,但分布较为零散,没有像紫花针茅(S.purpurea)草     

中国奇螽属的分类研究（直翅目：露螽科）

本文对中国奇螽属的种类进行了研究,并记述2新种, 即双刺奇螽Mirollia bispina sp. nov.和多齿奇螽Mirollia multidentus sp.nov.。模式标本保存于河北大学博物馆。     

Comparing multiple ChIP-sequencing experiments

New high-throughput sequencing technologies can generate millions of short sequences in a single experiment. As the size of the data increases, comparison of multiple experiments on different cell lines under different experimental conditions becomes a big challenge. In this paper, we investigate ways to compare multiple ChIP-sequencing experiments. We specifically studied epigenetic regulation of breast cancer and the effect of estrogen using 50 ChIP-sequencing data from Illumina Genome Analyzer II. First, we evaluate the correlation among different experiments focusing on the total number of reads in transcribed and promoter regions of the genome. Then, we adopt the method that is used to identify the most stable genes in RT-PCR experiments to understand background signal across all of the experiments and to identify the most variable transcribed and promoter regions of the genome. We observed that the most variable genes for transcribed regions and promoter regions are very distinct. Gene ontology and function enrichment analysis on these most variable genes demonstrate the biological relevance of the results. In this study, we present a method that can effectively select differential regions of the genome based on protein-binding profiles over multiple experiments using real data points without any normalization among the samples.     

苹果蠹蛾体内wolbachia wsp基因克隆与序列分析

【目的】对苹果蠹蛾Cydia pomonella L.体内共生菌Wolbachia进行分子生物学鉴定,确定该虫体内Wolbachia的进化位置,为进一步探讨Wolbachia对其生殖作用的调控机制提供理论依据。【方法】应用Wolbachia的wsp基因特异引物,通过PCR扩增法检测了苹果蠹蛾10个地理种群(新疆伊犁、吐鲁番、和田、石河子、奎屯、哈密、库尔勒、阿拉尔、喀什、和甘肃张掖)感染Wolbachia的状况,并对阿拉尔种群体内的Wolbachia的wsp基因进行测序和序列分析。【结果】苹果蠹蛾10个地理种群全部感染了tWolbachia,利用wsp基因的特异性引物从阿拉尔种群体内扩增出了617 bp的Wolbachia的wsp基因片段(GenBank登录号为KC832324),系统发育分析结果表明,苹果蠹蛾体内感染的Wolbachia属于A群Dor亚群,与锤角细蜂亲缘关系较近。【结论】苹果蠹蛾体内普遍感染了Wolbachia,属于A群Dor亚群。     

蛙下丘听觉神经元对双耳强度差检测功能的建模和仿真

建立了蛙下丘听觉神经元对双耳刺激强度差检测功能的一个数学模型。按此模型所作的计算机仿真和相应实验结果比较的一致性支持了下列假设 :下丘中的EO神经元对同侧刺激不产生反应可能是由于接受了来自同侧的强烈抑制性输入 ,从而掩盖了它同时接受到的来自同侧耳的兴奋性输入。而来自同侧的抑制性输入 ,与来自对侧的兴奋性输入可能通过突触前抑制的相互作用 ,则导致了EE神经元的双耳抑制现象。     

Rotenone activates phagocyte NADPH oxidase by binding to its membrane subunit gp91phox

Rotenone, a widely used pesticide, reproduces parkinsonism in rodents and associates with increased risk for Parkinson disease. We previously reported that rotenone increased superoxide production by stimulating the microglial phagocyte NADPH oxidase (PHOX). This study identified a novel mechanism by which rotenone activates PHOX. Ligand-binding assay revealed that rotenone directly bound to membrane gp91(phox), the catalytic subunit of PHOX; such binding was inhibited by diphenyleneiodonium, a PHOX inhibitor with a binding site on gp91(phox). Functional studies showed that both membrane and cytosolic subunits were required for rotenone-induced superoxide production in cell-free systems, intact phagocytes, and COS7 cells transfected with membrane subunits (gp91(phox)/p22(phox)) and cytosolic subunits (p67(phox) and p47(phox)). Rotenone-elicited extracellular superoxide release in p47(phox)-deficient macrophages suggested that rotenone enabled activation of PHOX through a p47(phox)-independent mechanism. Increased membrane translocation of p67(phox), elevated binding of p67(phox) to rotenone-treated membrane fractions, and coimmunoprecipitation of p67(phox) and gp91(phox) in rotenone-treated wild-type and p47(phox)-deficient macrophages indicated that p67(phox) played a critical role in rotenone-induced PHOX activation via its direct interaction with gp91(phox). Rac1, a Rho-like small GTPase, enhanced p67(phox)-gp91(phox) interaction; Rac1 inhibition decreased rotenone-elicited superoxide release. In conclusion, rotenone directly interacted with gp91(phox); such an interaction triggered membrane translocation of p67(phox), leading to PHOX activation and superoxide production.     

贵州洞穴三栉毛蛛属一新种记述(蜘蛛目,管网蛛科)(英文)

记述产自贵州省盘县的管网蛛科三栉毛蛛属1新种,命名为碧云三栉毛蛛Tricalamus biyun sp.nov..模式标本保存在河北大学生命科学学院.     

少动鞘氨醇单胞菌引起小儿败血症合并脑膜炎1例

本文报道1例罕见的由少动鞘氨醇单胞菌引起的小儿败血症合并脑膜炎。该患儿突发高热起病,伴有皮肤散在瘀点。根据实验室微生物分离和鉴定,确诊为少动鞘氨醇单胞菌引起的败血症;同时根据脑脊液生化常规结果,诊断为合并细菌性脑膜炎。少动鞘氨醇单胞菌引起的小儿败血症合并脑膜炎属罕见病例,且该患儿有类似流行性脑脊髓膜炎的症状,易被误诊为春季小儿流行性脑脊髓膜炎,需引起临床及实验室工作人员的重视。