By J. Gijs Kuenen, Lesley A. Robertson, Hans Van Gemerden (auth.), K. C. Marshall (eds.)
Advances in Microbial Ecology used to be validated by way of the overseas Com mittee on Microbial Ecology (ICOME) as a automobile for the book of serious reports chosen to mirror present tendencies 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, even though, to put up 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, stories of topical curiosity in relation to the ecology of microorganisms. With the booklet of quantity eight of Advances we welcome to the panel of participants Martin Alexander, the founding editor of this sequence, who discusses the diversity of usual constraints on nitrogen fixation in agri cultural ecosystems. Ecological facets of cellulose degradation are dis stubborn through L. G. Ljungdahl and ok. -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 method, and reviews at the hazard of manipulating the program. The advanced interactions between cardio and anaerobic sulfur-oxidizing micro organism are mentioned when it comes to normal habitats and chemostat tradition through J. G. Kuenen, L. Rob ertson, and H. van Gemerden. eventually, J. A. Robinson provides the benefits and boundaries within the use of nonlinear regression research in deciding upon microbial kinetic parameters in ecological events. ok. C. Marshall, Editor R. M. Atlas B. B.
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Extra resources for Advances in Microbial Ecology: Volume 8
J '£'£80 iLio I-CD ~ ~ 70. - - . . IJ Interactions among Sulfur-Oxidizing Bacteria 21 Mathematical modeling of mixed cultures of bacteria competing for a mixture oftwo or more substrates has been described (P. A. Taylor and Williams, 1974; Frederickson, 1977; Gottschal and Thingstad, 1982). All of these models predict that the maximum number of species that can coexist when competing for growth-limiting substrates can never be more than the number of substrates available. The results of experiments with two-species cultures can also be predicted from such models.
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. A more general conclusion that may be derived from these experiments is that metabolic rigidity, as exemplified by T. neapolitan us, may have ecological advantages, since it provides the organism with the potential to respond to fluctuating nutrient supplies with full capacity.
Some brown-pigmented Chlorobium species (for example, ChI. phaevibroides) differ from the green in having a high carotenoid content, and thus seem better equipped for competition with the Chromatiaceae. In fact, blooms containing green Chlorobium species together with a brown Chlorobium in place of the expected Chromatium have been found. 3). An example in which light limitation played a crucial role in the competition between brown Chlorobiaceae and purple sulfur bacteria was studied in connection with their simultaneous presence near the oxic/ anoxic interface of Lake Kinneret (Israel).