Effect of nitrogen starvation on ammonium-inhibition of nitrogenase activity in Azotobacter chroococcum Francisco J. CejudoAntonio Paneque Original Papers Pages: 481 - 484
Localized insertion of new S-layer during growth of Bacillus stearothermophilus strains Karin GruberUwe B. Sleytr Original Papers Pages: 485 - 491
Defects in cytochrome cd 1-dependent nitrite respiration of transposon Tn5-induced mutants from Pseudomonas stutzeri W. G. ZumftK. DöhlerK. Frunzke Original Papers Pages: 492 - 498
Rhizobial purine and pyrimidine auxotrophs: nutrient supplementation, genetic analysis, and the symbiotic requirement for the novo purine biosynthesis K. Date NoelRonald J. DieboldBenita A. Brink Original Papers Pages: 499 - 506
Arachidonic and oleic acids stimulate zygote formation in the presence of mating pheromone in the yeast, Saccharomyces cerevisiae Syuichi DoiMasayasu WatanabeMasao Yoshimura Original Papers Pages: 507 - 508
Dependency of growth yield, maintenance and K s-values on the dissolved oxygen concentration in continuous cultures of Azotobacter vinelandii J. KuhlaJ. Oelze Original Papers Pages: 509 - 514
Base composition of DNA from symbiotic dinoflagellates: a tool for phylogenetic classification Rudolf J. BlankVolker A. R. HussWalter Kersten Original Papers Pages: 515 - 520
Differences in lipid composition between free-living and initially adhered cells of a Gram-negative bacterium Anders ValeurAnders TunlidGöran Odham Original Papers Pages: 521 - 526
Surface properties from the S-layer of Clostridium thermosaccharolyticum D120-70 and Clostridium thermohydrosulfuricum L111-69 Margit SáraInge KalsnerUwe B. Sleytr Original Papers Pages: 527 - 533
Regulation of gluconate and ketogluconate production in Gluconobacter oxydans ATCC 621-H P. R. LeveringG. WeenkW. Harder Original Papers Pages: 534 - 539
Plasmids in carboxydotrophic bacteria: physical and restriction analysis Maria KrautOrtwin Meyer Original Papers Pages: 540 - 546
A phylogenetic survey of budding, and/or prosthecate, non-phototrophic eubacteria: membership of Hyphomicrobium, Hyphomonas, Pedomicrobium, Filomicrobium, Caulobacter and “Dichotomicrobium” to the alpha-subdivision of purple non-sulfur bacteria Erko StackebrandtAngelika FischerJan Smida Original Papers Pages: 547 - 556
Isolation and characterization of mutants of mesophilic methanogenic bacteria resistant to analogues of DNA bases and nucleosides Margaret R. KnoxJane E. Harris Original Papers Pages: 557 - 560
Isolation of auxotrophs and analysis of regulation of tryptophan biosynthesis in Zymomonas mobilis Christina K. EddyK. Dale NoelOliver H. Smith Original Papers Pages: 561 - 564
Calcium control of differentiation in Phytophthora palmivora Julia M. GriffithJoanne R. IserBruce R. Grant Original Papers Pages: 565 - 571
Isolation of the sulphur reductase and reconstitution of the sulphur respiration of Wolinella succinogenes I. SchröderA. KrögerJ. M. Macy Original Papers Pages: 572 - 579
Fatty acid analysis of four Azospirillum species reveals three groups Sigrid U. SchenkDietrich Werner Short Communication Pages: 580 - 582