Jasper P
J Bacteriol. 1978 Mar;133(3):1314-22. doi: 10.1128/jb.133.3.1314-1322.1978.
Rhodopseudomonas capsulata required potassium (or rubidium or cesium as analogs of potassium) for growth. These cations were actively accumulated by the cells by a process following Michaelis-Menten saturation kinetics. The monovalent cation transport system had Km's of 0.2 mM K+, 0.5 mM Rb+, and 2.6 mM Cs+. The rates of uptake of substrates by the potassium transport system varied with the age of the culture, although the affinity constant for the substrates remained constant. The maximal velocity of uptake of K+ was lower in aerobically grown cells than in photosynthetically grown cells, although the Km's for K+ and for Rb+ were about the same.
荚膜红假单胞菌生长需要钾（或铷或铯作为钾的类似物）。这些阳离子通过遵循米氏饱和动力学的过程被细胞主动积累。单价阳离子转运系统对钾离子、铷离子和铯离子的米氏常数分别为0.2 mM、0.5 mM和2.6 mM。尽管底物的亲和常数保持不变，但钾转运系统对底物的摄取速率随培养物的年龄而变化。有氧生长的细胞中钾离子摄取的最大速度低于光合生长的细胞，尽管钾离子和铷离子的米氏常数大致相同。
