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A wide range of aerobic chemoorganotrophs can also oxidize hydrogen gas.These organisms switch between energy sources as conditions dictate. The Secret of A Great Lawn Without Needing a Professional You Can Do It And I Can Show You How.The filaments of Beggiatoa species move by gliding motility, the mechanism of which is poorly understood. In contrast, the filaments of Thiothrix species are immobile; they fasten at one end to rocks or other solid surfaces.Often they attach to other cells, causing the filaments to form a characteristic rosette arrangement.

The metabolic activities of Thiobacillus species can also be used to prevent acid rain, which results from the burning of sulfur-containing coals and oils. 280 Chapter 11 The Diversity of Prokaryotic Organisms 280 Chapter 11 The Diversity of Prokaryotic Organisms 10 mm Figure 11.10 Filamentous Sulfur Bacteria Phase-contrast photomicrographs. (b) Multicellular filaments of a Thiothrix species, forming a rosette arrangement.

While plants use this form of nitrogen more readily, it is rapidly leached from soils.

Nitrifying bacteria are also an important consideration in disposal of sewage or other wastes with a high ammonia concentration.

The hydrogen-oxidizing bacteria are deeply branching in the phylogenetic tree, meaning that according to 16S r RNA studies, they were one of the earliest bacterial forms to exist on earth.

The fact that they require O2 seems contradictory to the presumed evolutionary position, but in fact, the low amount they require might have been available early on in certain niches due to photochemical processes that split water.


These bacteria are of particular interest to farmers who fertilize their crops with ammonium nitrogen, a form of nitrogen that is retained by soils because its positive charge enables it to adhere to negatively charged soil particles.

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