Antonie van Leeuwenhoek 66: 371-373, 1994. CONTENTS Volume 66 1994 Volume 66 Nos. 1-3 Special issue: Anaerobic Metabolism and Its Regulation Editors: A.H. Stouthamer & B. Schink Editorial A.H. Stouthamer, B. Schink Research Articles Oxygen regulated gene expression in facultatively anaerobic bacteria G. Unden, S. Becker, J. Bongaerts, J. Schirawski, S. Six The FNR family of transcriptional regulators S. Spiro Regulation of nitrate and nitrite reductase synthesis in enterobacteria V. Stewart Nitrate reductases in Escherichia coli V. Bonnefoy, J.A. Demoss The hydrogenases and formate dehydrogenases of Escherichia coli G. Sawers Denitrification and its control S.J. Ferguson Isolation, sequencing and mutational analysis of a gene cluster involved in nitrite reduction in Paracoccus denitrificans A.P.N. de Boer, W.N.M. Reijnders, J.G. Kuenen, A.H. Stouthamer, R.J.M. van Spanning Oxygen control in Rhizobium J. Batut, P. Boistard Photosynthetic electron transport and anaerobic metabolism in purple non-sulfur phototrophic bacteria A.G. McEwan Metabolism of sulfate-reducing prokaryotes T.A. Hansen Metabolism of methanogens M. Blaut 372 Metabolism of homoacetogens 209 G. Diekert, G. Wohlfarth Glycine metabolism in anaerobes 223 J.R. Andreesen Reductive dehalogenation as a respiratory process 239 C. Holliger, W. Schumacher Metabolism in hyperthermophilic microorganisms 247 R.M. Kelly, M.W.W. Adams Metabolic interactions between anaerobic bacteria in methanogenic environments 271 A.J.M. Stams Volume 66 No.4 Research Articles Isolation and study of two strains of Leptospirillum-like bacteria from a natural mixed 295 population cultured on a cobaltiferous pyrite substrate F. Battaglia, D. Morin, J.-L. Garcia, P. Ollivier Stability of copper tolerance in Thiobacillus ferrooxidans 303 K.A. Natarajan, K. Sudeesha, G. Ramananda Rao Pyrimidine ribonucleoside catabolic enzyme activities of Pseudomonas pickettii 307 T.P. West Yeast communities of the cactus Pilosocereus arrabidae as resources for larval and adult 313 stages of Drosophila serido P.B. Morais, C.A. Rosa, A.N. Hagler, L.C. Mendonca-Hagler Characterization of production and enzyme properties of an endo-ß-1,4-glucanase from 319 Bacillus subtilis CK-2 isolated from compost soil K. Aa, R. Flengsrud, V. Lindahl, A. Tronsmo Nucleotide sequence of an endo-ß-1,4-glucanase gene from Bacillus subtilis CK-2 327 V. Lindahl, K. Aa, A. Tronsmo Detection of Bacteroides fragilis endotoxin in amniotic fluid by counterimmunoelectro- 333 phoresis I. Beckmann, K. de Graaff, F. Meisel-Mikotajczyk, H.C.S. Wallenburg Synonymy of the yeast genera Wingea and Debaryomyces 337 C.P. Kurtzman, C.J. Robnett Anaerobic degradation of malonate via malonyl-CoA by Sporomusa malonica, Klebsiella 343 oxytoca, and Rhodobacter capsulatus I. Dehning, B. Schink Podospora lautarea sp. nov. from Southern Alps (France): description and physiological 351 properties P. Guiraud, L. Sage, F. Seigle-Murandi, R. Steiman Polar lipids and fatty acid composition of Thermus strains from New Zealand 357 A.S. Ferraz, L. Carreto, S. Tenreiro, M.F. Nobre, M.S. da Costa Instructions to Authors Author index Volume Contents