DRATE FERMENTATIONS IN YEAST HYBRIDS* By CARL C. LINDEGREN AND GERTRUDE LINDEGREN

* This work had the support of grants of the BACHE FUND of the NATIONAL ACADEMY OF SCIENCES and the Office of Naval Research. ** Communication No. 168. t Edsall16 has recently discussed the influence of the pH and ionic strength on the coefficient B of the proteins. $ Built.by Mr. W. H. Baker, Elmhurst, L. I., N. Y. § The sample was obtained through the courtesy of Mr. T. J. Deszczynski of the Department of Chemistry, Columbia University, New York, N. Y. 1 Svedberg, T., and Pedersen, K. O., The Ultracentrifuge, Oxford (1940), p. 382. 2 Svedberg, T., Nature, 128, 999 (1931). a Sjogren, B., and Svedberg, T., J. Am. Chem. Soc., 52, 5187 (1930). 4 Nord, F. F., Ranke-Abonyi, 0. M. v., and Weiss, G., Ber., 65, 1148 (1932); RankeAbonyi, 0. M. v., and Nord, F. F., Kolloid-Z., 58, 198 (1932); Weiss, G., and Nord, F. F., Z. physik. Chem., 166A, 1 (1933); Lange, F. E. M., and Nord, F. F., Biochem. Z., 278, 173 (1935); Holzapfel, L., Kolloid-Z., 85, 272 (1938); Bull, H. B., Z physik. Chem., 161A, 192 (1932). r Neduzhii, A. A., J. Applied Chem. (U.S.S.R.), 19, 535 (1946). 6 Putzeys, P., and Brosteaux, J., Trans. Faraday Soc., 31, 1314 (1935). 7 Heller, W., and Klevens, H. B., Phys. Rev., 67, 61 (1945). 8 Oster, G., J. Colloid Sci., 2, 291 (1947). 9 Lord Rayleigh, Phil. Mag., 47, 375 (1899). 10 Bull, H. B., Advances in Enzymol., 1, 1 (1941). 11 Debye, P., J. Phys. & Colloid Chem., 51, 18 (1947). 12 Barker, H. A., J. Biol. Chem., 104, 667 (1934). 13 Debye, P. P., J. Applied Phys., 17, 392 (1946). 14 La Rosa, W., Chemist-Analyst, 16, 3 (1927).