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).
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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

keratin

A proteinaceous material used as a retarder for plaster.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

keratin

, ceratin
a fibrous protein that occurs in the outer layer of the skin and in hair, nails, feathers, hooves, etc.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
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.
All that we can say for ceratin is that the making of a capitalist class is a tougher task than Western preachers and Eastern practitioners may have imagined.
He also revealed that after verification with the Land Transportation Office (LTO), the trucks which belong to Evangelista Trucking owned by a ceratin Simplicio Evangelista in Calamba City, Laguna are not registered.
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.
Firdous Ashiq Awan said on Wednesday that criticism for the sake of criticism should be avoided at this time of national crisis as this would affect the national unity.While replying to media persons questions at briefing held to share details of federal cabinet meeting here,she said that the countrymen trust the government and the government trusts them and false propaganda was being spread about the credibility of the government by ceratin elements which was against the national interests.
The acres of print this past week about his meal at Gillian Shepherd's house, and lunch with a prison officer, not to mention Mary Archer's concerned comments about the subsequent treatment of her husband, left me exasperated about how cross we get over ceratin ``baddies''.