Comparative analysis of whole-genome sequences of Streptococcus suis

The recent outbreak of Streptococcus suis in some districts of Sichuan Province in China has caused over 30 deaths and more than 200 infections in human be-ings[1]. Streptococcus suis is a Gram-positive, faculta-tively anaerobic bacterium, a peculiar path…     

Selection and development of representative simple sequence repeat primers and multiplex SSR sets for high throughput automated genotyping in maize

In the current study, 1900 maize simple sequence repeat (SSR) primers published in MaizeGDB were screened utilizing reference literature, 15 representative Chinese maize inbred lines and 15 Chinese maize hybrids from national regional testing. In total, 500 highly polymorphic primers were identified and used to construct a genetic map. 100 evenly distributed primers, 10 primers per chromosome, were further selected as a set of universal SSR core primers, recommended as preferred primers for general studies. These core primers were then redesigned and used to construct a high throughput multiplex PCR system based on a five-color fluorescence capillary detection system. We report here that two sets of ten-plex PCR combinations have been constructed, each consisting of 10 primers, with one primer per chromosome.     

黄颡鱼红头病病原研究

从患红头病的黄颡鱼的肝脏中分离获得HS807菌株,经人工感染试验为该病的致病菌,结合形态观察、培养特性及16S rRNA基因序列分析,HS807菌为鲇鱼爱德华氏菌。药敏试验表明,对复方新诺明、环丙沙星、先锋Ⅳ、强力霉素、青霉素、依诺沙星、环丙沙星、菌必治、新霉素、呋喃唑酮等药物敏感。     

日本绒螯线粒体DNA序列研究Ⅱ.1.16rRNA

参考果蝇、卤虫与锯缘青蟹的线粒体ＤＮＡ １６ＳｒＲＮＡ基因序列进行了日本绒螯蟹相同基因片段的引物设计、ＰＣＲ扩增及序列测定,得到５６７ｂｐ的咸基序列,其Ａ、Ｔ、Ｇ、Ｃ含量分别为１９４ｂｐ（３４．２２％）、２１６ｂｐ（３８．１０％）、９８ｂｐ（１７．２８％）５９ｂｐ（１０．４１％）,与果蝇、卤虫及锯缘青蟹类的１６ＳｒＲＮＡ基因片序列含量相似。     

桑泛素基因的克隆和表达

根据桑(Morus bombycis)泛素基因编码区的序列(DQ839402.)设计特异引物,用RT - PCR方法克隆桑泛素基因的编码区.序列分析表明,该编码区长240 bp,编码79个氨基酸,软件分析推测编码蛋白的相对分子量和等电点分别为8.74 kD和7.16.通过同源建模获得了桑泛素基因编码蛋白的理论三维结构.将桑泛素基因与pET - 32a(+)连接,构建原核表达载体pET - 32a - ub,经IPTG诱导,在大肠杆菌BL21(DE3) 中获得高效表达,并经western bolt 印迹证明实现了原核表达,为进一步研究其作用机理奠定基础.     

前沿

<正>通过白色光衍射断层扫描成像技术(WDT)可以打开一个观察细胞的新窗口,这项技术可以使细胞生物学家观察细胞新陈代谢的过程,而不会影响细胞的寿命,并使人们亲眼目睹药物的作用和干细胞的分化成为可能。伊利诺伊大学的研究人员在自然光子杂志发表了无需染色,轻松获取细胞3D图像     

社交网络入侵科研

2011年,伊曼纽尔·纳艾麦卡·纳迪（Emmanuel Nnaemeka Nnadi）在测定一些具有耐药性的真菌病原体的基因序列时，需要外界的帮助。但是，作为一名在尼日利亚研究微生物学的博士生,他并不具备所需的专业能力和设备。于是．他向一个免费的的学术社交网站——“研究之门”（Research Gate）求助，并且发现了几封电子邮件。在收到意大利遗传学家奥拉齐奥·罗密欧（Orazio Romeo）的回复后，     

DMTB: A comprehensive online resource of 16S rRNA genes,ecological metadata,oligonucleotides, and magnetic properties of magnetotactic bacteria

Magnetotactic bacteria (MTB) are of interest in microbiology, biomineralization, advanced magnetic materials, and bio-geo-sciences because of their ability to form highly ordered intracellular magnetic minerals. Great strides for MTB studies have been made in the past four decades. In this paper we complied the first internet-accessible database for MTB, Database of Magnestotactic Bacteria (DMTB). It contains information of 16S rRNA gene sequences, corresponding ecological metadata, oligonucleotides, and magnetic properties of MTB. The comprehensive information contained in DMTB will provide a very useful data resource for researchers from different disciplines. The website of DMTB is at http://database.biomnsl.com/.     

Catalytic Peptide Dendrimers as Artificial Proteins： Functional Selection and Optimization from Combinatorial Libraries

1 Introduction In de novo protein design one attempts to create artificial proteins with defined structure and function from first principles, usually with the help of trial-and-error procedures that scan a large number of possible amino acid sequences. Our approach to de novo protein design is based on peptide dendrimers. Dendrimers are tree-like structures that adopt a globular or disk-shaped structure as a consequence of topology rather than folding. Our peptide dendrimers are obtained by a…