use light as an energy source; in contrast, chemotrophs use chemical forms of energy. These fundamental groups may be subdivided into organotrophs, for which the electron source is organic; lithotrophs, for which the electron source is inorganic; or aquatrophs, for which it is water. Organisms that use an organic form of C are referred to as heterotrophs; those that use CO2 as C source are called autotrophs. Most heterotrophs are chemoorganotrophs (e.g., Pseudomonas spp., but some such as Rhodospirillaceae are chemophototrophs). Most autotrophs are chemolithotrophs or photolithotrophs. Some, such as the H2-oxidizing bacteria (6H2 + CO2 + 2O2 ^ CH2O + 5H2O), are facultative chemolithotrophs capable of growing on carbohydrates under aerobic conditions (see Gottschalk, 1986).

Organic Gardeners Composting

Organic Gardeners Composting

Have you always wanted to grow your own vegetables but didn't know what to do? Here are the best tips on how to become a true and envied organic gardner.

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