By M. Yavuz Corapcioglu

ISBN-10: 0444825002

ISBN-13: 9780444825001

This e-book is the 3rd quantity of a sequence: ''Advances in Porous Media''. Our target is to offer in-depth assessment papers that provide complete assurance to the sector of shipping in porous media. This sequence treats shipping phenomena in porous media as an interdisciplinary subject. therefore, ''Advances in Porous Media'' will proceed to advertise the extension of rules and functions in a single region to others, slicing throughout conventional limitations. the target of every bankruptcy is to study the paintings performed on a particular subject together with theoretical, numerical in addition to experimental reviews. The participants of this quantity, as for earlier ones, come from a number of backgrounds: civil and environmental engineering, and earth and environmental sciences. The articles are aimed toward all scientists and engineers in a variety of assorted fields occupied with the basics and purposes of techniques in porous media.

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Total bacterial counts of 10^ to 10^ cells/g of dry sediment were measured in one study (Chapelle, 1993). Very deep soils in dry environments may contain less than 10^ cells/g, and these cells may contain less than 100 viable cells/g (Chapelle, 1993). The low viable cell counts in these relatively dry environments could be due to a lack of moisture, which all microorganisms require to survive. The total number of microorganisms in the saturated zone usually depends on the type of flow system being studied.

3. Potential microbially mediated reactions in a aquifer (Bouwer and McCarty, 1984). , 1992). 9. 5. Microorganism growth periods Since microorganisms in the subsurface experience varying concentrations of substrate and electron acceptor, their growth rate and stages may be constantly changing. Therefore, the growth cycles of subsurface microorganisms may show some similarity to microbial growth in batch cultures. Microorganisms in batch culture experience four distinct growth periods (Bailey and OUis, 1986).

Microorganism growth periods (Baily and OUis, 1986). the metabolic pathways necessary to survive in the new conditions. A lag in growth may also occur when microorganisms are transferred into an environment of different ionic strength. Multiple lag periods are sometimes observed when a culture is fed two substrates, one of which is preferentially utilized. A lag occurs when the organism switches from the exhausted preferred substrate to the second substrate. This phenomenon is called diauxic growth.

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Advances in Porous Media, Vol. 3 by M. Yavuz Corapcioglu

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