Advances in Microbial Physiology by R.K. Poole (Eds.)

By R.K. Poole (Eds.)

This quantity is a part of a chain which gives debts of growth in microbial biology.

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Pneumoniae is grown under conditions of glucose excess. This would be comparable with growth of E. , 1992). We speculate that an additional role for the direct oxidation of glucose in enteric bacteria might be to help provide protection against oxygen inactivation during transfer from aerobic growth to anaerobic fermentative growth. g. pyruvateeformate lyase) are oxygen-sensitive, but are induced before conditions become completely anaerobic; they must, therefore, be protected from the remaining oxygen.

1991; Nickerson and Aspedon, 1992). PQQ-dependent oxidation of glucose to gluconate by membrane vesicles of E. , 1985). , 1992). Metabolism by way of glucose dehydrogenase and the Entner-Doudoroff pathway is sufficient to support growth of E. , 1992). Wild-type E. , 1991). The biomass produced was similar to that of cultures grown in the absence of PQQ and the Yglucose decreased because of increased utilization of glucose. In contrast, when the bacteria were grown in the presence of PQQ under glucose limitation there was no accumulation of gluconate; this is because the affinity of glucose for the phosphotransferase system is much greater than that for glucose dehydrogenase.

Co 0, Organlsm 4025 low copper MDH - - - -I - Cyt. C, Cyt. co 0, kudn Cyt. co 0, Organlsm 4025 high copper MDH -Cyt. ,,, Cyt. aa3 - O, Figure 13 Electron transport chains ofmethylotrophs. The details of these chains are discussed in Anthony (1992b). g. g. c - - + \ \ \ \r f w l f ' \ r 'Azurln' Cyt. co - 0 2 / 'Azurln' Qulnohaemoprotein alcohol dehydrogenase (type Ill) (membranes) Acetic acid bacteria : Acefobacfer and Gluconobacter ADH -haemsc - UQ Cyt. bo alternative oxidase - 0, 0, 0 2 Figure 14 Electron transport chains involved in the oxidation of alcohols.

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