辽宁省菜田生态系统组分优势值与系统优势度分析

辽宁省菜田生态系统组分优势值与系统优势度分析周宝利，葛晓光李宁义（沈阳农业大学园艺系，１１０１６１）（沈阳市城建中专，１１００１３）ＡｎａｌｙｓｉｓｏｎＳｕｐｅｒｉｏｒｉｔｙＶａｌｕｅａｎｄＤｏｍｉｎａｎｃｅＤｅｇｒｅｅｏｆＶａｒｉｏｕｓＣｏｍｐｏｎ...     

建立以TK基因为标记将外源基因导入臭曲霉（Asper—gillus...

A new system for selection of transformed Aspergillus foetidus was reported. In this system, TK- A. foetidus which were constructed by homologous recombination of mutated TK gene of vaccinia virus with TK gene of A. foetidus were screened by adding BUdR in agar plates. Conditions for screen of TK+ A. foetidus strain, transformation of A. foetidus and selection of transformed TK- A. foetidus have been studied. By using this system, several transformed A. foetidus which contained HBsAg gene derived bf a promoter H8 cloned from genomic DNA of A. foetidus were isolated. It was demonstrated that HBsAg gene was integrated into the chromosome DNA of A. foetidus by Southern blot after many passages of spores. ELISA showed that HBsAg was positive in the growth medium (p/n = 20). The 22 nm particles which were very similar to the HBsAg particles in human serum were found in the growth medium by immunoelectromicroscope. Western blot also gave the specific bands. All these data showed that HBsAg gene was expressed in A. foetidus and the products were secreted into the growth medium. The selection system using TK gene as marker could generally be used to study the expression of foreign gene in A. foetidus.     

关于抗栓酶临床应用中统一标准的建议

蝮蛇抗栓酶已在临床广泛应用十余年。治疗病例已达数十万例.但各家选择病例的标准及疗效评价的标准都不一致,观察方法也各行其是,评价结果有同有异,国内外广大医学界对其疗效的确切程度难以作出科学和合理的评价,这也是当前各种抗凝溶栓剂临床研究中共同存在的问题。     

生物技术药物：人类健康的未来保障

生物技术药物，顾名思义，是指通过生物技术（涉及DNA重组技术）所生产的用于治疗疾病的药物。从最早的疫苗、重组蛋白药物（如生长素、促红细胞生成素、白介素等）到近年来的单克隆抗体、干扰性核酸（siRNA）、纳米抗体（nanobodies）、基因治疗、干细胞（stemcells）等。这些药物的陆续问世，已经或正在为人类健康、防病治病、社会经济发展等发挥举足轻重的作用。而靶向药物的出现，更是生物技术药物领域的一朵奇葩，以其独特的疗效、极高的安全性、良好的耐受性，在重大疾病药物市场上脱颖而出，获得了包括患者及医生在内的广泛而高度的认可。