SUMMARY: A2 grown on thiosulphate lacks the capacity to transport succinate into the cells but is otherwise fully capable of oxidatively metabolizing succinate at a rapid rate. On the other hand, succinate-grown cells lack elements of the thiosulphate oxidation system; specifically, a special -type cytochrome. Adaptation of thiosulphate-grown cells to succinate is characterized by a 30–40 min pause in growth during which time an efficient succinate transport system is produced and net cytochrome synthesis ceases. Resumed synthesis of cytochromes and parallels resumption of growth in cells newly adapted to succinate. By contrast, net synthesis of the characteristic -type cytochrome of lithotrophic cells does not resume and the overall capacity to respire thiosulphate declines.


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