南阳牛血液基因组DNA提取与ANGPTL4基因的PCR扩增

采集20例南阳牛的血液,采用酚/氯仿法分离白细胞提取基因组DNA,并且对ANGPTL4基因部分序列(677～998 bp)PCR扩增条件进行了优化。结果表明,获得的牛基因组DNA经0.8%琼脂糖凝胶电泳检测,主条带清晰,表明获得的南阳牛基因组DNA可以用于后续实验;以所提取的基因组DNA为模板,优化ANGPTL4基因片段扩增的条件,结果表明,最理想的PCR扩增条件是模板量为2μL(50 mg/L),Taq聚合酶(5 u/μL)的量为0.8μL,退火温度为56℃,循环次数为35次。     

Science Letters:Detection of Catabacter hongkongensis in polluted European water samples

The Catabacteriaceae is a new bacterial family with a unique member: Catabacter hongkongensis is a strictly anaerobic, non-sporulating, Gram-positive coccobacillus that is phylogenetically related to some clostridial clusters. Little is known of its epidemiology and environmental distribution, but the inclusion of its 16S rRNA gene sequence in GenBank has allowed it to be detected qualitatively. As a first approach for prospective surveys, a real-time polymerase chain reaction (PCR) procedure to identify C. hongkongensis has been developed. The presence of Catabacteriaceae in 29 water bodies subjected to possible human or animal impact has been investigated. Four of them were positive. The results confirm that highly polluted water can contain C. hongkongensis.     

PCR技术快速鉴别牛、羊、猪皮革的初步探讨

提取牛、羊、猪3种动物皮革组织中的DNA,设计了3对特异性引物,PCR扩增,初步建立了这4种动物皮革成分的鉴定方法。DNA的提取的质量及其后的PCR鉴定依赖于皮革的加工程度,如何从皮革成品中提取有效的核酸信息需进一步研究。     

FTA滤膜用于PCR检测豆制品中蜡样芽孢杆菌的研究

采用FTA滤膜从豆制品中直接提取模板DNA,根据蜡样芽孢杆菌的hblA基因设计一对特异性引物进行PcR,并对反应条件进行优化．结果表明该引物能特异性扩增出338bp的目的条带;不增菌的情况下,PCR检测蜡样芽孢杆菌的灵敏度是102CFU／mL,检测时间为4h．     

放大电路常见干扰的抑制

放大电路在工作过程中容易受到无用信号的干扰，严重时使电路无法正守工作。本结合工作实际总结出一些方法，即通过合理布局、完善工艺、多点接地、提高电源质量、屏蔽和隔离干扰信号等措施能有效地抑制干扰，保证电路正常工作。     

Enhancement of the thermostability of β-1,3-1,4-glucanase by directed evolution

INTRODUCTION Enzymes are efficient and specific biocatalysts widely used in food industries, but their application in industrial process often involves special properties not found in natural source enzymes. In order to ob- tain desirable enzymes, in the past ten years, scientists have developed rational (Kurth et al., 1998; Mouratou et al., 1999; DeSantis et al., 1999) and irrational de- sign methods (Babbitt and Gerlt, 1997; O’Brien and Herschlag, 1999) to improve the enzyme propert…     

PCR法分析WSSV在日本对虾体内的感染增殖

注射白斑症病毒（WSSV）感染日本对虾，隔一定时间取样。PCR检测病毒在对虾体内的分布情况．结果表明：感染后12h首先在血液和鳃中出现病毒，而后是消化道和心脏，最后是肌肉和附肢，但在肝胰腺中没有观察到病毒．     

分子生物学技术在中草药研究中的应用

对近几年来利用分子生物学技术在中草药方面的研究进行了综述,并对其前景进行了展望。