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Host Controlled Variation in Bacterial Viruses. G. BERTANI AND J. J. WEIGLE  113 A Single Adaptive Enzyme in Saccharomyces Elicited by Several Related Substrates. NORBERTO J. PALLERONI AND CARL C. LINDEGREN  122 The Effect of X-Radiation on the Respiration of Escherichia coli. DANIEL BILLEN, G. E. STAPLETON AND ALEXANDER HOLLAENDER 131 Studies on the Dextransucrase of Leuconostoc dextranicum. WARNER W. CARLSON, CARMEN L. ROSANO AND VIRGINIA WHITESIDE-CARLSON 136 The Effect of Temperature on the Nutritional Requirements of Facultative and Obligate Thermophilic Bacteria. L. LEON CAMPBELL, JR. AND 0. B. WILLIAMS 141 Observations on the Biotin Requirement of Thermophilic Bacteria. L. LEON CAMPBELL, JR. AND 0. B. WILLIAMS 146 A Method for Preparing Permanent Stained Mounts of Pathogenic Fungi for Microscopic Examination. ALBERT M. KLIGMAN AND FLORENCE S. LEWIS   148 Production of Phenocopies in Aerobacter aerogene,s by Ultraviolet Radiation. AMOS NORMAN 1151 Growth Inhibitory Action of Copper for Mycobacterium phlei. DARRELL PRATT 157 Studies on the Spores of Aerobic Bacteria. I. The Occurrence of Alanine Racemase. BABETTE TAYLOR STEWART AND H. ORIN HALVORSON  160 Details of Frozen-Dried T3 and T7 Bacteriophages as Shown by Electron Microscopy. DEAN FRASER AND ROBLEY C. WILLIAMS  167 Pathogenesis of Candida albicans Infection Following Antibiotic Therapy. I. The Effect of Antibiotics on the Growth of Candida albicans. M. HUPPERT, D. A. MACPHERSON AND J.CAZIN 171 Radioactive Sulfur Tracer Studies on the Reproduction of T4 Bacteriophage. 0. MAAL$E AND N. SYMONDS 177 Effect of Vitamin B12 Derivatives on Oxidation and Vitamin Uptake by Escherichia coli. EVELYN L. OGINSKY AND PATRICIA H. SMITH  183 The Nature of the Adaptive Lag of Pseudomonas fluorescens Toward Citrate. JAMES T. BARRETT, A. D. LARSON AND R. E. KALLIO 187 Characterization of Some Thermophilic Bacteria from the Hot Springs of Yellowstone National Park. CONNELL L. MARSH AND DON H. LARSEN 193 The Isoelectric Point of Bacterial Cells. VIRGINIA P. HARDEN AND JOHN 0. HARRIS.. 198 The Nutritional Requirement of Threonineless Mutants of Escherichia coli. H. EDWIN UMBARGER  203 Differentiation of Alcaligenes faecalis from Brucella bronchisepticus by Biochemical and Nutritional Methods. JOHN A. ULRICH AND GERALD M. NEEDHAM 210 Production of Nitrite from Ammonia by Methane Oxidizing Bacteria. WILLIAM E. HUTTON AND CLAUDE E. ZOBELL 216 Notes: Rediscovery of Bacillus badius Batchelor. MARZIEH SAGHAFI AND M. D. APPLEMAN 220 Transamination in Cell-Free Extracts of Effective and Parasitic Rhizobia. D. C.

A SINGLE ADAPTIVE ENZYME IN SACCHAROMYCES ELICITED BY SEVERAL RELATED SUBSTRATES