A polyunsaturatedorganiccompound is one in which more than one double bond exists within the representative molecule. That is, the molecule has two or more points on its structure capable of supporting hydrogenatoms not currently part of the structure. Organic has several meanings and related topics. ... A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. ... Covalent bonding is a form of chemical bonding characterized by the sharing of one or more pairs of electrons between atoms, in order to produce a mutual attraction, which holds the resultant molecule together. ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... General Name, Symbol, Number Hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1 (IA), 1 , s Density, Hardness 0. ... Properties For alternative meanings see atom (disambiguation). ...
The lack of the extra hydrogen atoms on the molecule's surface typically reduces the strength of the compound's intermolecular forces, thus causing the melting point of the compound to be significantly higher. This property can be seen by comparing usually unsaturated vegetable oils, which remain liquid even at relatively low temperatures, to much more saturated butter, a substance which can solidify near room temperature. Intermolecular forces are electromagnetic forces which act between molecules or between widely separated regions of a macromolecule. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The term saturation generally means thoroughly full, and can refer to the following: In chemistry, see saturation (chemistry) for a number of meanings. ...
Although polyunsaturated fats are protective against cardiac arrhythmias a study of post-menopauseal women with a relatively low fat intake showed that polyunsaturated fat was positively associated with progression of coronary atherosclerosis, whereas monounsaturated fat was not
Cell membranes of mammals have a higher composition of polyunsaturated fat (DHA, omega-3 fatty acid) and a lower composition of monounsaturated fat than do reptiles.
Higher polyunsaturated membrane content gives greater membrane fluidity (and functionality), commensurate with the higher metabolic rate of the warm-blooded species.
The aim of this study was to assess the levels of polyunsaturated fatty acids (PUFA) in liver total lipids, triacylglycerols and phospholipids of NAFLD patients, in relation to those in adipose tissue and hepatic indexes related to oxidative stress, as factors contributing to hepatic steatosis.
Polyunsaturated fatty acids (PUFAs) and exercise-induced stress are known to increase the oxidative susceptibility of lipids in muscle tissue.
The increased resistance of erythrocytes to hemolysis, the increased glutathione peroxidase activity, and the increased degree of unsaturation of fatty acids in the erythrocyte membrane are compatible with a reduction of oxidative stress during hemodialysis with vitamin E-modified membranes.
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