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factors” necessary for the maintenance of health and indeed for life itself, the
synthetic vitamins are now recognized as being valuable therapeutic agents for
treatment of deficiency syndromes and as such they may legitimately be
considered as drugs. The vitamins as a class are not chemically related, and they
are classified according to their solubility and chieftherapeutic effect into two
groups: 1) water - soluble vitamins 2) fat - soluble vitamin group. It is known
to be essential for the maintenance ofnormal epithelial tissue.
Vitamins A is anunsaturated cyclic alcohol. It is synthesized by at least three
separate processes. It has been concentrated and isolated from the non-
sapomflable to be present in fish oil, both in the free alcohol and in the ester
form. The source of all vitamin A is in the carotenoid pigments, the yellow -
coloured, compounds occurring in all chlorophyll - containing plants. In pure
form it is a pale yellow oil, soluble in fat solvents, having an ultra - violet
absorption spectrum. The ester forms ofthe vitamin have been found to possess
greater stability than the free alcohol.
Vitamin Bl, Vitamin B2, Vitamin B6, Vitamin В12, Vitamin С and other
are statedto belongto the water - soluble vitaminclass. VitaminB2 (riboflavine)
is built up from a ribose and isoalloxazine residue, the name riboflavine being
derived from the sugar component and the intense yellow fluorescence of its
agucous solution. It is ofwide occurrence innature and constitutes a component
ofthe flavin coenzome systems.
VitaminС (ascorbic and acid) is essential for the normal functioningof living
cell and is involved in many enzymatic reactions. It is required for the
development of cartilage, teeth and bones, for wound healing and aiding the
absorption of iron fromthe intestine. Gross deficiency causes scurvy.
Notes
1. breakdown-нарушение
2. to result in - зд. в результате появляются
3. the deficiency diseases - болезни, вызываемые нехваткойфакторов пи
тания, болезни недостаточности
4. of the order - порядок
5. in addition to being “accessory food factors” - кроме того, они являют
ся добавочными факторами питания
6. as such - как таковые
Текстыдля самостоятельного чтения: (См. учебникМ.С.Муравей-
ская, Л.К.Орлова “Английский язык для медиков.”- Москва, 1999),
“BelozerskyA.N. (Russian Biochemist andMolecular Biologist).”Стр. 80.
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