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By Abraham Lerman (auth.), A. Lerman, M. Meybeck (eds.)

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G) can be modified strongly for the degradation of the same molecule . One mole of glucose can produce from 16 to 399 Kcal of available energy during alcoholic fermentation or total oxidation, respectively. The energy yields are, respectively, 28 and 67% (Senez, 1968) . The nature of the available carbon sources, electron donors, and electron acceptors promotes different microbial populations having specific nutritional requirements that are designated as physiological groups: cellulolytic, chitinolytic, ligninolytic, aerobic, anaerobic, sulfur oxidizing, nitrifying, denitrifying, and other bacteria (Dommergues and Mangenot, 1970; Alexander, 1977).

And Stumm. W. (1983) The role of surface coordination in the dissolution of &-A1 2 0 3 in dilute acids. Chimia 37, 338-341. Garrels R. M. and Howard, P. (1959) Reactions of feldspar and mica with water at low temperature and pressure, in Proc. Sixth National Conference on Clays and Clay Minerals, Oxford, England, Pergamon Press, pp. 68-88. Garrels R. M. and Mackenzie F. T. (1971) Evolution of Sedimentary Rocks. , New York, 397 pp. Grandstaff D. E. (1977) Some kinetics of bronzite orthopyroxene dissolution.

This pretreatment is now widely applied. 2 a. o ~~---+--~--;---+-~r--+--~ TIME. ys 0 0 20 40 60 Figure 5. Cumulative release of (a) dissolved (molybdate-reactive) silica and (b) suspended particulate silica (defined as the difference between the total silica in the supernatant solution and the molybdate-reactive silica), as a function of time in two series of stepwise dissolution experiments of quartz, conducted by Clelland et al. (1952) (taken from Petrovich, 1981). rc refers to rock crystal and Ls designates Lochaline quartz.

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