\kˈɛɹɐtˌɪn], \kˈɛɹɐtˌɪn], \k_ˈɛ_ɹ_ɐ_t_ˌɪ_n]\
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A class of fibrous proteins or scleroproteins important both as structural proteins and as keys to the study of protein conformation. The family represents the principal constituent of epidermis, hair, nails, horny tissues, and the organic matrix of tooth enamel. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms an alpha-helix, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure.
By DataStellar Co., Ltd
Ceratin, epidermose; a scleroprotein or albuminoid present largely in cuticular structures such as hair, nails, horns, etc.; it contains a relatively large amount of sulphur. It is insoluble in the gastric juices and it is for this reason sometimes used for coating pills which are intended to be dissolved only in the intestine.
By Stedman, Thomas Lathrop
By William R. Warner
By Henderson, I. F.; Henderson, W. D.
By Willam Alexander Newman Dorland
One of the classes of protein substances, present abundantly in the horny structure of the epidermis, the hair, the hoofs, feathers, shells of tortoises, horns, etc. The k's contain an unusual amount of sulphur and yield up on hydrolytic cleavage an abundance of cystin. Used in the preparation of pills and capsules which are intended to pass through the stomach unchanged. The keratin of commerce is extremely impure, and worthless for coating pills. [Gr.]
By Smith Ely Jelliffe
Word of the day
- Diaphthol, ortho-oxyquinoline-meta-sulphonic acid; light yellowish crystals, very slightly soluble cold water, antiseptic in 1 per cent. solution; recommended also internally as a urinary antiseptic.