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Natural microbial habitats include various interfaces--liquid-liquid, gas-liquid, solid-liquid, and solid-gas. An interface, the boundary between two phases, has physical and chemical properties that differ from those of either phase. Bacteria, yeasts, and algae often concentrate at interfaces, and the ability of microorganisms to exploit resources in their environment may be markedly affected by the nature of the available interfaces. Included within the realm of microbial activity at interfaces are such wide-ranging topics as predator-prey relations, tooth decay, gastrointestinal tract infections, mating contact, marine fouling, adsorptive bubble processes, oil degradation, rhizosphere associations, and bacterium-clay interactions. In this book, bacteria are treated as living colloidal systems, and the behavior of microorganisms at interfaces is analyzed on the basis of this concept. Nonspecific physical and chemical forces acting on microorganisms at interfaces are described and related to biological factors determining the distribution of and interaction between microorganisms in both aquatic and terrestrial ecosystems. The final chapter describes specific microbe-microbe, microbe-plant, and microbe-animal interfacial interactions. Although laboratory studies of cultured microorganisms are essential in assessing their potential capabilities, an individual microbial species in a natural habitat is confronted by physical, chemical, and biological interactions rarely encountered under pure culture conditions. Interfaces are important aspects of microbial ecosystems, and this study of the influence of interfaces on natural habitats is an important and original contribution to microbial ecology.
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This volume of Advances in Microbial Ecology marks a change in the editor ship of the series. The Editorial Board wishes to take this opportunity to express its gratitude to Martin Alexander, the founding editor and editor of the first five volumes, for his enterprise in establishing the series and in ensuring that Advances has become an outstanding focal point for the identification of new developments in the rapidly expanding field of microbial ecology. With the publication of this volume, we welcome Howard Slater to the Editorial Board. The policies of the Editorial Board remain the same as before. Most con tributions to Advances in Microbial Ecology will be solicited by the Board. However, individuals are encouraged to submit outlines of unsolicited contri butions to the Board for consideration for inclusion in the series. Advances is designed to serve an international audience and to provide critical reviews on basic and applied aspects of microbial ecology. Contributions in the present volume are predominantly concerned with the ecology of aquatic microorganisms, but encompass a variety of approaches to this area. The exception is the chapter by J. W. Doran on the role of micro organisms in the cycling of selenium. G-Y. Rhee discusses the effects of envi ronmental factors on phytoplankton growth. The factors limiting the produc tivity of freshwater microbial ecosystems are considered by H. W. Paerl.
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