Search results
Results from the WOW.Com Content Network
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 green sulfur bacteria are a phylum, Chlorobiota, [4] of obligately anaerobic photoautotrophic bacteria that metabolize sulfur. [ 5 ] Green sulfur bacteria are nonmotile (except Chloroherpeton thalassium , which may glide) and capable of anoxygenic photosynthesis .
Green blood may refer to: Green Blood, a Japanese manga series by Masasumi Kakizaki; Hemocyanin, a copper-based system of transporting oxygen in blood found in many molluscs and arthropods; Sulfhemoglobinemia, a rare condition in humans caused by excess sulfhemoglobin in the blood
The biological use of sulfur as an alternative to carbon is purely hypothetical, especially because sulfur usually forms only linear chains rather than branched ones. (The biological use of sulfur as an electron acceptor is widespread and can be traced back 3.5 billion years on Earth, thus predating the use of molecular oxygen. [28]
Pure sulfur only forms under certain conditions on Earth, such as volcanic processes or in hot or cold springs. Depending on the process, different minerals are created at the same time as the sulfur.
Chlorobium chlorochromatii, originally known as Chlorobium aggregatum, is a symbiotic green sulfur bacteria that performs anoxygenic photosynthesis and functions as an obligate photoautotroph using reduced sulfur species as electron donors. Chlorobium chlorochromatii can be found in stratified freshwater lakes. [2]
Chlorobium is a genus of green sulfur bacteria. They are photolithotrophic oxidizers of sulfur and most notably utilise a noncyclic electron transport chain to reduce NAD+. Photosynthesis is achieved using a Type 1 Reaction Centre using bacteriochlorophyll (BChl) a.
Realgar was also used by Ancient Greek apothecaries to make a medicine known as "bull's blood". [12] The Greek physician Nicander described a death by "bull's blood", which matches the known effects of arsenic poisoning. [12] Bull's blood is the poison that is said to have been used by Themistocles and Midas for suicide. [12]