keratin

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keratin

(kĕr`ətĭn), any one of a class of fibrous proteinprotein,
any of the group of highly complex organic compounds found in all living cells and comprising the most abundant class of all biological molecules. Protein comprises approximately 50% of cellular dry weight.
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 molecules that serve as structural units for various living tissues. The keratins are the major protein components of hair, wool, nails, horn, hoofs, and the quills of feathers. These proteins generally contain large quantities of the sulfur-containing amino acidsamino acid
, any one of a class of simple organic compounds containing carbon, hydrogen, oxygen, nitrogen, and in certain cases sulfur. These compounds are the building blocks of proteins.
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, particulary cysteinecysteine
, organic compound, one of the 20 amino acids commonly found in animal proteins. Only the l-stereoisomer participates in the biosynthesis of mammalian protein.
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. The helical keratin molecules twist around each other to form elongated strands called intermediate filaments. The formation of a covalent chemical bondchemical bond,
mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an
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 called a disulfide bridge between the sulfer atoms on two cysteins on separate polypeptide chains of keratin allows for the cross-linkage of these chains and results in a fairly rigid aggregate. This phenomenon is seen to be consistent with the physiological role of the keratins, which provide a tough, fibrous matrix for the tissues in which they are found. Human hair is approximately 14% cystine (cysteins cross-linked by disulfide bridges).

keratin

[′ker·əd·ən]
(biochemistry)
Any of various albuminoids characteristic of epidermal derivatives, such as nails and feathers, which are insoluble in protein solvents, have a high sulfur content, and generally contain cystine and arginine as the predominating amino acids.

keratin

A proteinaceous material used as a retarder for plaster.

keratin

, ceratin
a fibrous protein that occurs in the outer layer of the skin and in hair, nails, feathers, hooves, etc.
References in periodicals archive ?
Both RSSL and CTC are recognised for their leadership in ceratin scientific disciplines, and both organisations are actively involved in training for the food industry.
A new AD applicable to ceratin Dornier Model 328-100 series aircraft has been adopted by the FAA.
2) In August 1996, Congress passed legislation clarifying that ceratin
California,(72) the Court approved schemes that again require the jury to impose death under ceratin statutorily defined circumstances.
the secret is fruit wine The intense essence of fruit in some dessert wines marries surpriseingly well with ceratin main dishes.
The Mangaged Stations include WWWB, WPBF and KCWB, two of which are owned by Hearst and the other of which Hearst provides ceratin services to under a local marketing agreement, and are managed by Hearst-Argyle in exchange for a management fee.
Tenders are invited for Special Repair To Md Accn Block No P 133 At Umed Vihar And Ceratin Revenue Work At Rms
He said the military leadership explained ceratin defence related issues before the Parliament for the first time and lauded their positive role in the nation building process.
Mazda is ceratin that its good looking CX-7 sports crossover is creating just such a 'niche within a niche' by bringing the brand's Zom-Zoom sports car attitudes to the SUV sector - emulating the achievement of the RX-8 sports coupe in the sports car segment after its 2003 launch.