. The chemical activities of bacteria. Bacteria. 74 THE FORMATION OF ENZYMES IN BACTERIA hydrogenase. In this example the optimum activity plcL is 6-0 (Fig. 46), but maximal formation of the enzyme occurs at ^H 8-0 (Fig. 4a) and investigation of the effective activity between growth pH values of 6 and 8 shows that the greater formation of the enzyme between these values compensates for the loss of activity per enzyme unit over this range. As a result the effective activity is approximately constant over the middle of the growth range but falls off rapidly GROWTH pH-d 120- Z' ^\ 100- 80- / â A
. The chemical activities of bacteria. Bacteria. 74 THE FORMATION OF ENZYMES IN BACTERIA hydrogenase. In this example the optimum activity plcL is 6-0 (Fig. 46), but maximal formation of the enzyme occurs at ^H 8-0 (Fig. 4a) and investigation of the effective activity between growth pH values of 6 and 8 shows that the greater formation of the enzyme between these values compensates for the loss of activity per enzyme unit over this range. As a result the effective activity is approximately constant over the middle of the growth range but falls off rapidly GROWTH pH-d 120- Z' ^\ 100- 80- / â A Qm8 X \ 60- 40- X \ V \ I / \ 20- >( \ t X 4 5 S 6 7 8 9 Qme 20-. 45 5 6 7 8 9 pH OF MEDIUM DURING GROWTH REACTION^H (O) (b) Fig. 4. (a) Variation of potential activity (â¢-â¢) and effective activity (x---x) of hydrogenase of Esch. coli with ^H of medium during growth. (6) Variation of reaction pH of hydrogenase activity of Esch. coli grown at various pB. values. (After Gale and Epps, Biochem. J., 1942, 36, p. 612.) outside these limits. In these cases, then, we get a restricted amount of compensatory formation over the neutral part of the growth range but no compensation towards the ends of that range. Enzymes in this group include hydrogenase, succinic dehydrogenase, glucozymase, and tryptophanase. Growth temperature It has become customary to study many organisms after growth at 37° C, presumably since this is the temperature of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gale, E. F. (Ernest Frederick). New York, Academic Press
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