III. DNA-Binding Proteins and Regulation of Transcription by Negative and Positive Control (Transcriptional level regulation) DNA结合蛋白与转录水平的调控 8.5 Negative control of transcription: Repression and Induction转录的负调控 8.6 Positive Control of Transcription ----Activator mediated regulation by protein-DNA binding IV. Global Regulation Mechanisms 8.7 Catabolite Repression ----Global control and the lac operon代谢分解物抑制 8.8 Other global control network 8.9 Quorum Sensing 群体感应
从烟草根际土壤中成功筛选出10株解钾细菌,并选择其中四种透明圈明显且生长量较大的菌种进行了解钾活性测定,其中解钾细菌GJ07的发酵液中K+离子质量浓度高出空白对照组54.5%.对GJ07进行16S rDNA的鉴定,确定其为巨大芽孢杆菌.采用批量发酵培养,通过改变碳源、氮源、碳氮比、温度、pH值、装液量等研究了解钾细菌GJ07生长的优化控制条件.结果表明蔗糖和蛋白胨为GJ07生长的最佳碳源和氮源(碳氮质量比为10:1),最适宜生长温度为35℃,最适宜初始pH值为7.00,最佳装液量为25 mL