Stress relaxation of animal fibres

Balasubramaniam, E.; Whiteley, K. J.

doi:10.3233/bir-1968-5304

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“…Since well-defined and reproducible samples are required for systematic studies, most recent work in this field has been performed on native fibers. [2][3][4][5][6][7][8][9][10][11] Artificial fibers of regenerated proteins prepared by spinning methodsI2 have also been subjected to mechanochemical study to give information about the influence of temperature and various chemical agents on the denaturation arid solubility of these protein^. '^,'^ From a biophysical point of view, however, it is important to use oriented samples with the native properties of the biopolymer retained.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical study of wet‐spun lithium‐DNA fibers

Rupprecht

1970

Biopolymers

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synopsisUniform LiDNA fiber specimens of nearly 20 m length have been prepared with a wetspinning method developed by the author. Samples immersed in the spinning bath (goyo ethyl alcohol containing 0.4M LiC1) have been subjected to mechanochemical study involving stretching, relaxation, and contraction measurements. A special technique was developed to transfer the sample from the Teflon-coated cylinder used in spinning to the sample column of the mechanochemical apparatus without stretching or removing the sample from the spinning bath. Force-strain curves of samples consisting of two fiber bundles showed an initial region of low slope followed by a region of high slope and a second region of low slope up to rupture. Some thicker specimens showed an aging effect which abolished the initial low-slope region and was interpreted as indicative of crystallization. Force-strain curves of two-bundle samples showed a strong influence of temperature with a complete loss of tensile strength of the LiDNA fibers in the spinning bath at about 55OC. Furthermore, samples at zero strain exhibited a contractile force when subjected to temperatures above about 40°C; the contractile process was pronounced with samples kept above 48°C. On contraction these samples obtained a zero-force length 2@-30a/, of the original. These data are taken as evidence for a helixttrcoil transition occurring in the DNA, the low melting temperature being caused by the chemical influence of the ambient aqueous alcohol-LiC1 bath.

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Section: Introductionmentioning

confidence: 99%

Mechanochemical study of wet‐spun lithium‐DNA fibers

Rupprecht

1970

Biopolymers

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Stress relaxation of animal fibres

Cited by 1 publication

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Mechanochemical study of wet‐spun lithium‐DNA fibers

Mechanochemical study of wet‐spun lithium‐DNA fibers

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