Anionic and cationic components of the K99 surface antigen from Escherichia coli B41.

Succinate Dehydrogenase-dependent Nutritional Requirement for Succinate in Mutants of Escherichia coli ~ 1 2 . By I. T. CREAGHAN and J. R. GUEST Heterothallic Phytophthora : Evidence for Hormonal Regulation of Sexual Reproduction. By W. H. KO Purification and Properties of an NAD(P)+-linked Formaldehyde Dehydrogenase from Methylococcus capsulatus (Bath). By D. I. STIRLING and H. DALTON . A Spectrophotometric Technique for Recording Uptake of an Organomercurial by Mycelial Fungi. By W. GREENAWAY, S. WARD, A. K. RAJANand F. R. WHATLEY Effect of Incubation Media on the Recovery of Escherichia coliK12 Heated at 52 "C By M. AHMAD, B. S. SRIVASTAVA and S. C. AGARWALA Control of Lactate Production by Selenomonas rzlrninantium : Homotropic Activation of Lactate Dehydrogenase by Pyruvate. By R. J. WALLACE Effect of Morphine Analogues on Chemotaxis in Escherichia coli. By S. PERSKYBROSH, J. R. YOUNG, M. J. C. HOLLAND and E. J. SIMON Investigation of the Effect of Environmental Conditions on the Rate of Exopolysaccharide Synthesis in Azotobacter vinelandii. By T. R. JARMAN, L. DEAVIN, S. SLOCOMBE and R. C. RIGHELATO . .