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Mechanochemical melting of collagen fibers. I. Mechanical contractions

✍ Scribed by J. Yonath; A. Oplatka

Publisher: Wiley (John Wiley & Sons)
Year: 1968
Tongue: English
Weight: 784 KB
Volume: 6
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1968.360060808

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✦ Synopsis

Tlie corrclatioii lx*t\vccii niecliaiiical and chemical processes ill the coiitractilc system c~llageii fibers-aqueous l<CSS solutions was investigated. Meltiiig and coiltraction of the fibers here induced by applying a force sufficiently high as to prevent melting in a KCNS solution arid then decreasing it either suddenly, or continuously at a constant rate. The kinetics of both processes are characterized by an initial rapid elastic response of the crystalline collagen, followed by a stationary region. The force-velocity relationship in this region was found to be the same under different types of mechanical deformations. It is probable that under the prevailing conditions, the behavior in the stationary state is determined by the melting process and is not markedly influenced by diffusional changes. Part of the experimental data could be explained by assuming a linear, rigid model or, better, by takiirg into account the highly elastic properties of the amorphous collagen. The kinetic uiiit seems to be composed of several hundred amiiio acid residues.

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