β Scribed by L.N.M. Duysens; J. Amesz
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o.o16 M/~-glycerophosphate where it might be assumed that substrate formation is fast enough so that it is no longer rate-controlling. In addition to the cases above, Ross and his associates 3 have reported variation in pH optima for alkaline phosphatase activity with substrate concentration for phenyl disodium phosphate, adenylic acid, fructose-I,6-diphosphate, fructose-6-phosphate, and ribonucleic acid. The same analysis may be applied to these; and the "true" substrate may be selected as that which demonstrates an optimum concentration invariant with pH change. It was found that the optimum concentration was constant when the un-ionized acid form was picked as the substrate for all cases but ribonucleic acid, where the monovalent ion showed invariance.
π SIMILAR VOLUMES
Fluorescence measurements have been made from the fuel region of methane and ethylene diffusion flames employing the more intense uv lines of a high pressure mercury lamp (250, 310, 334,365,405, and 436 nm) and the blue and green lines of an argon ion laser (488 and 514.5 nm). The collected spectra