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It is a rare blood condition in which the β-pyrrole ring of the hemoglobin molecule has the ability to bind irreversibly to any substance containing a sulfur atom. [1] [2] When hydrogen sulfide (H 2 S) (or sulfide ions) and ferrous ions combine in the heme of hemoglobin, the blood is thus incapable of transporting oxygen to the tissues.
The purple sulfur bacteria and the green sulfur bacteria use hydrogen sulfide as an electron donor in photosynthesis, thereby producing elemental sulfur. This mode of photosynthesis is older than the mode of cyanobacteria , algae , and plants , which uses water as electron donor and liberates oxygen.
Hektoen enteric agar (HEK, HE or HEA) is a selective and differential agar [1] primarily used to recover Salmonella and Shigella from patient specimens. HEA contains indicators of lactose fermentation and hydrogen sulfide production; as well as inhibitors to prevent the growth of Gram-positive bacteria.
If this occurs, the newly formed hydrogen sulfide (H 2 S) reacts with ferrous sulfate in the medium to form ferrous sulfide, which is visible as a black precipitate. Examples of sulfide-producing bacteria include Salmonella, Proteus, Citrobacter and Edwardsiella species. The blackening of the medium is almost always observed in the butt (bottom ...
Bacteria able to decarboxylate lysine will leave the media purple colored. Bacteria producing hydrogen sulfide will appear black. [1] A frequent test done with LIA agar is the LIA slant. Here the LIA is solidified at an angle, then inoculated with bacteria by stabbing the agar to within 1/4 inch of the bottom of the tube and streaking the slant ...
On blood agar plates, the colonies are typically convex and large, with a brown pigment, and cause “greening” of the agar around the colonies. S. putrefaciens are non-lactose fermenters on MacConkey agar. As with all Shewanella, this organism produces hydrogen sulfide on TSI. [2]
Production of hydrogen sulfide has been linked to irritable bowel disease (IBD) by damaging the gut epithelium's mucus layer and to colorectal cancer. [6] In addition, during treatments with antibiotics, hydrogen sulfide can aide opportunistic bacteria grow leading to antibiotic resistance. [6]
Hydrogen sulfide is also involved in the disease process of type 1 diabetes. The beta cells of the pancreas in type 1 diabetes produce an excess of the gas, leading to the death of these cells and to a reduced production of insulin by those that remain. [5] In 2005, it was shown that mice can be put into a state of suspended animation-like ...