The genetic relationship and phenotypic expression of mutations endowing Pneumococcus with resistance to erythromycin.

CONTENTS Utilization of L-Glutamic and 2-Oxoglutaric Acid as Sole Sources of Carbon by EscheTichia coli BY Y. S. HALPERN and H. E. UMBAGER . . . . . . . . . . . The Cultural and Physiological Characters of the Pediococci BY H. L. G~~NTHER and H. R. WHITE Serological Characters of the Pediococci BY H. L. GUNTHER and H. R. WHITE . . . . The Production of Sporidesmin and Sporidesmolides by Pithomyces chartarum BY J. DONE, P. H. MORTIMER, A. TAYLOR and D. W. RUSSELL . . . . . . . . . Growth of Leptospiru in Defined Media BY H. VOGEL and S. H. HUTNER . . . ' . . Distribution of Urease in Clostridiurn perfringens Types BY M. E. BROOKS . . . . . The Measurement of the Liberation of Pencillinase from Bucillus subtilis BY M. R. POLLOCK The Location of Cell-bound Pencillinase in Bacillus subtilis BY D. J. KUSHNER and M. R. POLLOCK . The Mechanism of Liberation of Penicillinase from Bacillus subtilh BY M. R. POLLOCK . . . The Genetic Relationship and Phenotypic Expression of Mutations Endowing Pneumococcus with Resistance to Erythromycin BY A. W. RAVIN and V. N. IYER . . . . . . Transforming Activities and Base