MICRB265 Lecture 12: MICRB 265 Lecture 12 Sulfur and Iron Oxidizers
25 Apr 2018
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2-) to the toxic gas hydrogen sulfide (h2s) or its anions (hs-, s2-), depending on the ph of. ), but there is one gram positive bacterial genus (desulfotomaculum). Note that the bacterial srb have the prefix. Desulfo- in the genus name: a few archaeal genera are srb (e. g. pyrococcus) and usually are thermophiles as well, because the srb are such a diverse group, many types of metabolism are represented. Most srb can use h2 as an electron source, and lactate or pyruvate (seldom glucose) as a carbon source. These are typical fermentation waste products, so srb are commonly found in anaerobic biofilms in close physical association with fermenters. This activity typically occurs in biofilms (located on the metal surface) containing diverse fermenters and srb, and results in corrosion pits beneath the biofilm. Srb activity costs billions of dollars globally each year in damage to metal and concrete and souring of petroleum reservoirs.
