By J. Gijs Kuenen, Lesley A. Robertson, Hans Van Gemerden (auth.), K. C. Marshall (eds.)

Advances in Microbial Ecology used to be tested by way of the overseas Com­ mittee on Microbial Ecology (ICOME) as a car for the ebook of serious stories chosen to mirror present developments within the ever-expanding box of microbial ecology. many of the chapters present in Advances in Microbial Ecology were solicited via the Editorial Board. everyone is inspired, although, to publish outlines of unsolicited contributions to any member of the Editorial Board for attention for inclusion in a next quantity of Advances. Contributions are anticipated to be in­ intensity, even provocative, studies of topical curiosity with regards to the ecology of microorganisms. With the booklet of quantity eight of Advances we welcome to the panel of members Martin Alexander, the founding editor of this sequence, who discusses the diversity of average constraints on nitrogen fixation in agri­ cultural ecosystems. Ecological elements of cellulose degradation are dis­ stubborn by means of L. G. Ljungdahl and okay. -E. Eriksson, and of heavy steel responses in microorganisms via T. Duxbury. In his bankruptcy, A. Lee con­ siders the gastrointestinal tract as an ecological approach, and reviews at the hazard of manipulating the program. The complicated interactions between cardio and anaerobic sulfur-oxidizing micro organism are mentioned by way of usual habitats and chemostat tradition through J. G. Kuenen, L. Rob­ ertson, and H. van Gemerden. eventually, J. A. Robinson offers the benefits and boundaries within the use of nonlinear regression research in settling on microbial kinetic parameters in ecological occasions. ok. C. Marshall, Editor R. M. Atlas B. B.

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Versutus tends to adapt gradually rather than to respond with full potential to a sudden change in the environment, it was outcompeted by both of the specialists. When small amounts of acetate were included in the thiosulfate supply, and thiosulfate in the acetate supply (Fig. 8B), T. versutus was able to maintain itself as a small proportion of the community. An increase in the proportions of these additives and a reduction of the main substrates (Fig. 8C) resulted in the versatile species regaining the advantage, since it was no longer obliged to switch between autotrophic and heterotrophic growth, but could grow mixotrophically throughout.

The former was used preferentially by the Chlorobium and the latter by the Thiocapsa. When light was supplied in excess, both organisms should have been able to grow mixotrophically on both substrates, but instead of coexisting, the Thiocapsa completely outcompeted the other species (van Gemerden, 1983). The relatively high growth rate ofthe brown Chlorobium under light limitation is linked to its requirement for maintenance energy, which is tenfold lower than that of the Thiocapsa species (Fig.

Although this may be the case, another possibility might be that the Chlorobium was excreting organic molecules (SirevAg and Ormerod, 1977), which were then assimilated by the Chromatium. Other complicating factors might be the excretion of thiosulfate by the Chlorobium (Schedel, 1978) Table VI. Chlorobium limicola f. 10 90 87 50 5 89 91 49 2 aAfter Biovolume Protein 10 11 13 50 95 9 51 98 van Gemerden and Beeftink (1981). 8 throughout. Interactions among Sulfur-Oxidizing Bacteria 35 or the formation of polysulfides from sulfide and sulfur (van Gemerden, 1983).

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