The CCR5 32-bp deletion allele is rare in a Chinese population
- 作者：Fan Wang ; Mei Hong Xiu ; Dong Feng Zhou ; Lian Yuan Cao ; Gui Ying Wu ; Therese A. Kosten ; Thomas R. Kosten ; Xiang Yang Zhang
- 关键词：Bacillus subtilis ; Biosurfactant ; Surface tension ; Interfacial tension ; Critical micelle concentration ; Emulsification
- 刊名：Schizophrenia Research
- 出版年：2008
- 期刊代码：240_09209964
- 类别：med
- 出版时间：April 2008
- 卷：101
- 期：1-3
- 页码：341-343
- 文件大小：104 K
摘要
The production and properties of a biosurfactant, synthesized by a member of the Bacillus subtilis group (PTCC 1696) which was isolated from an Iranian oil field, have been investigated. The biosurfactant, which was produced as a primary metabolite associated with the growth of PTCC 1696, was able to reduce the surface and interfacial tension of media to 26.7 and 0.1 mN/m, respectively. Crude biosurfactant and acid precipitated biosurfactant have critical micelle concentrations of 10 and 100 μg/ml, respectively. The stability of the biosurfactant at different salinities, pH and temperature and also its emulsifying activity have been investigated. It is an effective surfactant at very low concentrations over a wide range of temperatures, pHs and salt concentrations and also has the ability to emulsify oil, which is essential for enhanced oil recovery.