严格和宽松型大肠杆菌细胞在葡萄糖限制趋化器中的混合培养动力学。

D Riesenberg, F Bergter
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引用次数: 4

摘要

研究了严格型和宽松型大肠杆菌细胞在葡萄糖限制型趋化器中不同稀释率的混合培养动力学。与稀释率无关,严格的细胞与放松的细胞竞争。但随着稀释率的增加,松弛细胞被严格细胞显示所需的代数增加。结果讨论了鸟苷-5'-二磷酸-3'-二磷酸(ppGpp)的调节作用,已知在营养限制条件下,在严格和宽松的细胞中以不同浓度存在。此外,根据PIRT(1965),假设大肠杆菌严格细胞的维持代谢系数比放松细胞慢。
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Mixed culture kinetics of stringent and relaxed Escherichia coli cells in glucose-limited chemostat.

The mixed culture kinetics of stringent and relaxed Escherichia coli cells were investigated in a glucose-limited chemostat at different dilution rates. Independent of the dilution rate the stringent cells competed out the relaxed cells. But the number of generations necessary for displaying the relaxed cells by the stringent ones increased with increasing dilution rate. The results are discussed as a consequence of the regulatory role of guanosine-5'-diphosphate-3'-diphosphate (ppGpp) which is known to be present at different concentrations in stringent and relaxed cells under conditions of nutrient limitation. In addition, it is postulated that the coefficient of the maintenance metabolism according to PIRT (1965) is slower in stringent cells than in relaxed cells of E. coli.

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