SUMMARY: The ATP pool in growing in continuous culture under carbohydrate-limited conditions was low (averaging 2.3 nmoles/mg dry wt bacteria) and appeared independent of growth rate over the range of optimum growth. The high maximum growth yield ( 62) previously found for another strain of selenomonad was confirmed and growth on glucose plus pyruvate gave a calculated value for of about 21. A tentative scheme is suggested for production of ATP from electron-transfer reactions which would make the value for for high growth-yield rumen anaerobic bacteria nearer to the accepted value of 10 than the values found using previously suggested modes of ATP formation.


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