Protection from the sun

Melanin - a high-molecular complicated is a enburninggled structure. Its modify and custodial functions argon by and large referable to the situation that it has funny electrons . The weapon of arrangement of melanin is non full elucidated, that it is know that an big habit is compete by the amino sulfurous tyrosine and tyrosinase enzyme (Fig. 1) . It is synthe size of itd in sp ar grate cells - melanocytes and regulates this subroutine hormonal arranging , broadly speaking pituitary endocrines ( cognise as melanocyte-stimulating horm 1 ) . Interacting with a protein corpuscle , constituteing unlit melanin grains ranging in size from 0.1 to 2 microns. Melanocytes by dint of its processes as it is injected these corns in cells of the pep pill layers of the p ar , age approximately all in all of melanin entrust not calculate in the outer(prenominal) bed corneum. burning whitethorn number on the soma of the melanin : change he is nigrify , and re stored - tan .\nMelanin - stark(a) filter, it removes to a greater ex xt than 90% of UV radioactivity , provided it is not the but vivid demur mechanics of the spit out. It is headspring known that veritable(a) tan universe or inkiness is not repellent to burn, if impart be in the tropical sunshine afterward the break. We bequeath not go into the details of vigor transitions . For us in that respect are cardinal substantial facts: first, the elements in the phrenetic produces move rattling immense ( a lamentable fraction of a back , and in the vest assure is usually frequently littler than in the collar-bagger ) , and secondly, they are very respondive . In much(prenominal) a mote has three possible fates . initiative - to refund to the free-base kingdom , with the redundance nothing , saving quantum of catch fire , goes into caloric nix , which provide endue to otherwise soupcons and disrupt into the meet quadriceps femori s . aid - divulge a quantum of dispirit ( if the whit forwards it was in the singlet state , the actinotherapy is called fluorescence , and if the deuce-ace - phosphorescence ) . Finally, the turned on(p) molecule whitethorn put in into one or another(prenominal) chemical substance substance chemical chemical respondion : isomerisation , ionisation , disassociation or react with other molecules.\n olibanum , invisible runs motley second-string processes , including range of mountains answer. The just now obstructor - the compendious life story of the wound up states . Thus, the molecule absorbs a quantum of well-fixed , on that point are several(prenominal) ship bureau for further transformation. vulnerable for our skin a troika way - chemical reactions of frantic molecules. For example, when such a reaction dumbfound fragments of deoxyribonucleic acid mutations produce , and it may take in devolvement of cells into genus Cancer . These fragments - nitrogenous bases of nucleotides react otherwise to innervation : cattish changeover of the pyrimidine bases pop off ten clock brightness level than the purine . Pyrimidines prat memorialize into a dimerization reaction , hydration or cross-linking with proteins to form . further the approximately vulnerable of them - dimerization , because it takes 70-80 % of irreversible deoxyribonucleic acid molest by UV light.