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 foreign Com mittee on Microbial Ecology (ICOME) as a car for the book of serious reports chosen to mirror present tendencies within the ever-expanding box of microbial ecology. lots of the chapters present in Advances in Microbial Ecology were solicited by means of the Editorial Board. everyone is inspired, even if, 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, experiences of topical curiosity when it comes 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 variety of average constraints on nitrogen fixation in agri cultural ecosystems. Ecological features of cellulose degradation are dis stubborn via L. G. Ljungdahl and ok. -E. Eriksson, and of heavy steel responses in microorganisms by means of T. Duxbury. In his bankruptcy, A. Lee con siders the gastrointestinal tract as an ecological process, and reviews at the threat of manipulating the program. The advanced interactions between cardio and anaerobic sulfur-oxidizing micro organism are mentioned when it comes to common habitats and chemostat tradition through J. G. Kuenen, L. Rob ertson, and H. van Gemerden. ultimately, J. A. Robinson provides the benefits and barriers within the use of nonlinear regression research in picking microbial kinetic parameters in ecological occasions. okay. C. Marshall, Editor R. M. Atlas B. B.
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Extra info for Advances in Microbial Ecology: Volume 8
Thus, by showing a less dramatic response to changes in its environment than T. versutus, Thiobacillus S is able to retain enough "reactivity" to compete successfully with specialist organisms present in the enrichment inoculum. 2. Competition Involving Phototrophs As previously stated, many phototrophic bacteria require sulfide, carbon dioxide, and light, and growth is often enhanced by organic molecules of low molecular weight. As with the colorless sulfur bacteria, the outcome of competition among the phototrophs is governed by the number and type oflimiting substrates available, together with the occurrence and duration of environmental fluctuations such as those involving pH, redox potential, and, most important in this case, light.
These experiments lead to the conclusion that the specific growth rates of the specialists lie above that of the versatile organism over a whole range of substrate concentrations provided that only one substrate is present. The specialists will therefore outcompete the nonspecialist under these conditions. When the competition experiments were repeated using mixtures of acetate and thiosulfate, the picture changed. The addition of acetate or glycollate to the autotrophic cultures (Fig. 5) and thiosulfate to the heterotrophic cultures (not shown) resulted in an increase in the steady state number of T.
A final example of a situation where the colorless sulfur bacteria have a distinct, if unexpected, selective advantage is in the extremely hot springs and pools that are the terrestial equivalent of the marine vents. Brock (1978) has reported that different forms of life have distinct upper temperature limits. For example, fish are not found above 38°C, protozoa above 56°C, and photosyntheic bacteria above 70-73°C. However, some colorless sulfur bacteria have been found growing in water at 95°C.
Advances in Microbial Ecology: Volume 8 by J. Gijs Kuenen, Lesley A. Robertson, Hans Van Gemerden (auth.), K. C. Marshall (eds.)