Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Sulfur biological importance

Vincent Du Vigneaud United States sulfur compounds of biological importance, synthesis of polypeptide hormone... [Pg.409]

Compounds containing a pyramidally arranged (hence, chiral) sulfur to which are linked three alkyl or aryl groups, resulting in a net positive charge on the sulfur. A biologically important example is S-adenosyl-L-methi-onine chloride. Sulfonium salts can also be utilized as analogs or mimics of carbocation intermediates in enzyme-catalyzed reactions. For example, methyl-(4-meth-ylpent-3-en-l-yl)vinylsulfonium perchlorate proved to be an excellent inhibitor (Ki = 2.5 tM) of the enzyme that catalyzes the formation of the bicyclic (+)- -pinene ... [Pg.666]

Szacilowski K, Chmura A, Stasicka Z. Interplay between iron complexes, nitric oxide and sulfur ligands Structure, (photo)reactivity and biological importance. Coord Chem Rev 2005 249 2408-36. [Pg.186]

Henriksen, B.S., Anderson, J.L., Hrycyna, C.A., and Gibbs, R.A. (2005). Synthesis of desthio prenylcysteine analogs sulfur is important for biological activity. Bioorg Med Chem Lett 15 5080-5083. [Pg.88]

Figure 10 Scheme for the uptake and incorporation of sulfate into cells and the formulas of some biologically important sulfur-containing molecules (source Frausto da Silva and Williams, 2001). [Pg.4518]

The Earth s sulfur cycle (Figure 22) transfers enormous amounts of this biologically important element through various reservoirs each year. Sulfur has a wide range of oxidation states and shows the ability to form a large number of oxides and oxyanions, many of which are found in the environment. It also has the potential to form polymeric species with a significant number of... [Pg.4537]

Selenium substitutes for sulfur in amino acids to form seleno-cysteine, cystine, and methionine. The selenium-containing antioxidant glutathione peroxidase is biologically important, and selenium is a necessary trace nutrient in warm-blooded animals. Grazing animals develop a form of muscular dystrophy and other disorders when grazing in areas in which the selenium has been depleted with selenium-depleted diets, people develop... [Pg.1141]

The sulfur atom has six valence electrons, and therefore there are six bond pairs in the molecule. In order for these pairs to be as far from one another as possible, the molecule has the shape of a regular octahedron, as shown in Figure 1.27a. In this structure the bonds are all equivalent, and the bond angle is exactly 90°. This type of arrangement is found in many molecules of biological importance, such as the molecule of hemoglobin, which is a complex compound of the ferrous ion, Fe ". ... [Pg.47]

With regard to plant nutrition, sulfur is -after nitrogen, phosphoms and potassium -the fourth major plant nutrient. In plants, sulfur is used to form the amino acids methionine, cystine and cysteine, all of which are important for the formation of proteins, as well as many other biologically important, natural sulfur-containing com-... [Pg.1301]

The breakdown of protein and amino acids in the intestinal tract and their enzymatic hydrolysis in cells releases sulfur from sulfur-containing proteins. The biological importance of sulfur partly involves the amino acids methionine, cysteine and taurine, and other metabolites such as glutathione and N-acetyl-methionine. Hence, sulfur plays biochemical and physiological... [Pg.1306]


See other pages where Sulfur biological importance is mentioned: [Pg.59]    [Pg.579]    [Pg.7]    [Pg.400]    [Pg.95]    [Pg.10]    [Pg.1581]    [Pg.154]    [Pg.96]    [Pg.37]    [Pg.45]    [Pg.282]    [Pg.1627]    [Pg.327]    [Pg.67]    [Pg.536]    [Pg.575]    [Pg.250]    [Pg.174]    [Pg.176]    [Pg.632]    [Pg.83]    [Pg.327]    [Pg.1386]    [Pg.1969]    [Pg.119]    [Pg.2397]    [Pg.4519]    [Pg.1]    [Pg.608]    [Pg.461]    [Pg.229]    [Pg.837]    [Pg.1119]    [Pg.595]    [Pg.171]    [Pg.1385]    [Pg.1957]   
See also in sourсe #XX -- [ Pg.237 , Pg.238 ]




SEARCH



Biological importance

Biologically important

© 2024 chempedia.info