Diversity of Environmental Biogeochemistry

Preface. I. Paleoenvironments. Primary and secondary controls on carbon-isotopic compositions of sedimentary organic matter (R. Takigiku et al.). Amber and the direct observation of paleomicrobiota (A. Nissenbaum). IIa. Natural and Xenobiotic Organic Indicators: Natural Compounds in Different Environments. Microbial transformation of fecal pellet lipids during sedimentation (H.R. Harvey et al.). Application of Hydrocarbon biochemical markers to the study of particulate matter in a high turbidity estuary (P. Scribe et al.). Biogeochemical changes in lipids in a model marine food chain (S.A. Bradshaw et al.). Biomarkers in the bituminous fraction of a Spanish brown coal (J.C. Del Rio, F.J. Gonzalez-Vila and F. Martin). Geolipid content of sediments from an isolated lake: Evidence for diagenetic alteration of source indicators (E.S. Ho, P.A. Meyers and S. Pettingill). Preliminary study of extractable organic matter in aerosols from Beijing and Guiyang, China (Sheng Guoying et al.) IIb. Natural and Xenobiotic Organic Indicators: Xenobiotic Compounds in Soils. Microbial transformation of the herbicide metolachor (J.M. Bollag and S.Y. Lui). Biomineralization and long-term fate of ¹⁴C-labelled organic xenobiotic compounds in soil (I. Scheunert). Contribution to the study of non-extractable pesticide residues in soils: Incorporation of atrazine in model humic acids prepared from catechol (G. Bertin et al.) III. Organic Matter and Carbon Cycle in Recent Sediments. Transfer and biogeochemistry of organic matter at the sediment-water interface on the North Western Mediterranean margin (R. Buscail and F. Gadel). Budget of organic matter and behaviour of phenolic compounds in a Mediterranean lagunal ecosystem (B. Charriere, F. Gadel and L. Serve). Biogeochemistry of organic matter at the fresh water/sea interface in the Rhone Delta, Mediterranean Sea, France (V. Denant and A. Saliot). Behaviour of dissolved organic matter in pore waters of near-shore marine sediments (J. Faganeli and G.J. Herndl). Evolution of organic matter diagenesis at water -sediment interface off-shore from the Mahakam Delta, Indonesia (M.N. Hermin and S. Castanier). Giant marine amorphous aggregations in the Northern Adriatic Sea (P. Peduzzi and G.J. Herndl). IV. Deep Reservoirs and Extreme Environments. Biodegradation of crude oils (K. Bosecker, M. Teschner and H. Wehner). The role of microbiology in the geological containment of radioactive wastes (J.M. West et al.). MnO2 reduction by marine Mn²⁺ oxidizing bacteria from around hydrothermal vents at a Mid-Ocean spreading center and from the Black Sea (H.L. Ehrlich, L.A. Graham and J.C. Salerno). Diversity of microbial life in highly acidic, mesophilic environments (D.B. Johnson). Cometabolic transformation of O-xylene in ground water (C. Jørgensen and J. Aamand). The microbiology of high pH springwaters of Northern Oman with reference to waste disposal (N. Christofi and J.C. Philp). V. Sulfur and Nitrogen Oxido-Reduction Processes. Survival of sulphate-reducing bacteria in oxic layers of paddy soils (C. Furusaka, Y. Nagatsuka and H. Ishiguri). Enzymatic mechanism in the "dehydrogenation" of ferrous ions by Thiobacillus ferrooxidans (T. Yamanaka et al.). The role of certain infauna and vascular plants in the mediation of redox reactions in marine sediments (M.E. Hines). Ecological conditions and physiological mechanism of N2O-formation by nitrite by Fusarium solani (P. Malinowsky and J.C.G. Ottow). Dissimilative nitrate reduction to ammonium in different soils in waterlogged conditions. (E. Correa Fazzolari and J.C. Germon). Nitrous oxide emissions from soils as determined by the composition of denitrifying microbial population (J.C. Munch). VI. Weathering and Formation of Minerals. Bacteria as nucleation sites for authigenic minerals (F.G. Ferris, W.S. Fyffe and T.J. Beveridge). Siliceous crusts, quartz rinds and biotic weathering of sandstones in the cold desert of Antarctica (R. Weed and S.A. Norton). Differences in decomposition of carbonate and silicate minerals as influenced by humic acid (K.H. Tan). Freshwater calcitic and manganic algal crusts from the "Plaine Lorraine" (Eastern Paris Basin) (J. Allouc, J.F. Pierre and B. Guillet). The in situ weathering of a test-mineral (vermiculite) introduced in a podzol (haplaquod) and in an hydromorphic soil (haplaquept) compared to the soil clay minerals evolution (D. Righi et al.). Nitrification related to acidification and silicate weathering (G. Simon-Sylvestre et al.). VII. Soil Functioning Processes. Regulation of the formation and degradation of humic substances in soil (K. Haider). Carbon dioxide and climate: climatic impact of soil-borne CO2 (H.G. Bertram). Changes in organic matter in an oxisol from the Central Amazonian Forest during eight years as pasture, determined by ¹³C isotopic composition (T. Chone et al.). The dynamics of organic matter in a latosol-podzol toposequence in Amazonia (Brasil) (S. Bravard and D. Righi). Effect of plants on nitrogen and carbon turnover in soil (K. Haider, A. Mosier and O. Heinemeyer). Effect of metals on the biodegradation of roots exudates by a rhizosphere microflora (J.L. Morel). Differences induced in the soil organic matter characteristics and the microbial activity by various management practices in long term field experiments (S. Houot et al.). Impact of an oil spill on microbial activities in a Danish saltmarsh (H.J. Albrechtsen). Iron suphide accumulation in the rhizosphere of wetland rice (Oriza sativa L.) as the result of sequential microbial activities (V.A. Jacq, K. Prade and J.C.G. Ottow). Nitrogen transformations in irradiated soil as determined by ¹⁵N dilution isotopic technique (R. Castet and G. Guiraud). Evolution of the mineral "Sierra de Bejar" Mountain (J.F. Gallardo et al.). Influence of mineral nutrients redistribution in Eucalyptus plantations on soil properties (M.A.V. Madeira). Comparative physico-chemical analyses of soil-feeding (Thoracotermes macrothorax) and fungus growing (Macrotermes mülleri) termite mounds (E. Sillam Garnier). Spatial patterns of soil composition around isolated trees (A. Escudero, M.M. Hernandez and J.M. del Arco). An in situ experimental study of forest soil functioning using the mineral bag technique (J. Ranger et al.). Acknowledgements.