Dixon, M., Webb, E. C., “Enzymes,” Academic Press, New York, N.Y., 1958, pp 152, 493. Fawcett,,J. Y., Mor;js, C. J. 0. R., Separ. Sci., 1 , 9 (1966). Hamowitz, Felix, Chemistry and Biology of Proteins,” Acadeniic Press, New York, N.Y., 1950, p 127. Hicks, G. P., Updike, S. J., Anal. Chern., 38, 726 (1966). Kerr, It. W., Cleveland, F. C., Katzbeck, W.J., J . Amer. Chem. SOC., 73, 3916 (1931). Kooi, T. I
