Advances in Microbial Ecology by Ian M. Head, Neil D. Gray, Richard Howarth (auth.), Bernhard

By Ian M. Head, Neil D. Gray, Richard Howarth (auth.), Bernhard Schink (eds.)

Volume sixteen of Advances in Microbial Ecology has a tricky heritage. approximately midway via its of entirety, Gwynfryn Jones needed to renounce as handling edi­ tor for healthiness purposes, and he requested me to take over. i need to thank Gwyn for his devoted paintings during this booklet sequence, and need him the entire top for the longer term. After the swap in editorship, a few authors needed to be inspired on fairly brief discover to supply their chapters for you to make visual appeal of this quantity attainable inside of an affordable time period. still, i feel that the articles we current with this quantity characterize an relaxing selection of updated con­ tributions to microbial ecology. In my very own knowing, microbial ecology com­ prises the elucidation of microbial actions in usual or semi ordinary environ­ ments, together with body structure, biochemistry, inhabitants dynamics, and interactions with all of the biotic and abiotic environmental stipulations microbes stumble upon. This includes experiences on unmarried organisms in outlined cultures in an ecological according to­ spective, the research of microbial actions in advanced environments, in addition to the advance of suggestions for the interactions of microorganisms with the realm within which they dwell. final yet no longer least, microbial ecology isn't an unique technological know-how studied completely in foreign places untouched via human beings.

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_0. ~ Iii mB ~ A. oxaliferum in darkened core • A. > Calcium conc. in darkened core • Calcium conc. - 20 ~ 50 10 10 o 2 4 6 8 10 12 14 16 18 20 Depth (mm) Figure 14. Relationship between solid phase calcium concentration and A. oxaliferum numbers in a freshwater sediment from Rydal, Cumbria. The A. oxaliferum population redistributes according to the position of the oxycline within the sediment. This was induced by incubating sediment cores either in the dark or in the light. Lmole cm- 3 ). 7 X 105 cells ml- I .

Furthermore, it has been noted that in the profundal sediments of a eutrophic lake the A. oxaliferum population disappears following the development of an anoxic hypolimnion as a consequence of thermal stratification (B abenzien, 1991). In addition to oxidation by molecular oxygen, sulfide also reacts chemically with reduced iron or can be oxidized by iron and manganese minerals. , 1997) and may be important reactions in limiting the diffusion of dissolved sulfide to the oxidized upper layers of a sediment (Jorgensen, 1988).

The greatest similarities were to the apsA (P = 4 X 10- 72) and apsB (P = I X 10- 23 ) sequences from Desulfovibrio vulgaris, but significant sequence similarity with the homologous genes from Chromatium vinosum (aprA, P = 4 X 10- 46 ; aprB, P = 3 X 10- 9 ) and Archaeoglobus fulgidus (aprA, P = I X 10- 52 ; aprB, P = 3 X 10- 19) was also evident. This strongly suggests that the sequences are APS reductase genes. To date it has been impossible to verify that the putative APS reductase genes genuinely came from A.

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