High- and low-crimp wool fibers, due to the influence of low nutrition levels, had increased crimp frequencies and increased volume swelling in formic acid but decreased sulfur content and fiber diameter. Ortho- and paracortical cells were liberated by ultrasonification of the two types of wool swollen in formic acid. Low-crimp fibers disintegrate more readily than high-crimp fibers, and the rate is markedly accelerated in wools from sheep with low levels of nutrition. The expected compositional variations between ortho- and paracortical cells were observed, but in addition, both cell types were sensitive to genetic and nutritional variation.
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References
1.
Bradbury, J.H. , The Structure and Chemistry ofKeratin Fibers, Adv. Protein Chem.27, 111-211 (1973).
2.
Bradbury, J.H. , and Chapman, G.V., The ChemicalComposition of Wool, Part I: Separation and Microscopic Characterization of Components Produced by Ultrasonic Disintegration, Aust. J. Biol. Sci.17, 960-972 (1964).
3.
Bradbury, J.H. , and Kulkarni, V.G., The ChemicalComposition of Wool, Part XIII: Separation and Analysis of Microfibrils, Textile Res. J.45, 79-83 (1975).
4.
Caldwell, J.B. , and Milligan, B., TheEstimation of CrossLinking in Wool from the Extent of Swelling in Formic Acid , J. Textile Inst.61, 588-596 (1970).
5.
Campbell, M.E. , Whiteley, K.J., and Gillespie , J.M., Compositional Studies of High- and Low-Crimp Wools, Aust. J. Biol. Sci.25, 977-987 (1972).
6.
Campbell, M.E. , Whiteley, K.J., and Gillespie , J.M., Influence of Nutrition on the Crimping Rate of Wool and the Type and Proportion of Constituent Proteins , Aust. J. Biol. Sci.28, 389-397 (1975).
7.
Chapman, R.E., in "Biology of the Skin and Hair Growth," A. G. Lyne and B. F. Short, Eds., Angus and Robertson Ltd., Sydney, 1965, p. 201.
8.
Feughelman, M., and Chapman, B.M., TheSwelling of Wool Fibers with Reduced Disulfide Content in 98% Formic Acid , Textile Res. J.36, 1110-1111 (1966 ).
9.
Fraser, R.D.B. , Gillespie, J.M., and MacRae, T.P., Tyrosine-Rich Proteins in Keratins, Comp. Biorhem. Physiol. 448, 943-947 (1975).
10.
Gillespie, J.M., TheSwelling of Keratins in Formic Acid, Textile Res. J.40, 853-855 (1970).
11.
Gillespie, J.M., Proteins Rich in Glycine and Tyrosine from Keratins, Comp. Biochem. Physiol.418, 723-734 (1972).
12.
Horio, M., and Kondo, T., Crimping of Wool Fibers, Textile Res. J.23, 373-386 (1953).
13.
Kulkarni, V.G. , SomePhysico-Chemical Studies on the Primary and Secondary Fibers of Low-Crimp Merino Wool, Textile Res. J.50, 419-422 (1980).
14.
Kulkarni, V.G. , and Bradbury, J.H., The ChemicalComposition of Wool, Part XII: Further Studies on Cortical Cells and Macrofibfils, Aust. J. Biol. Sci.27, 383-396 ( 1974).
15.
Kulkarni, V.G. , and Bradbury, J.H., The Chemical Composition of Wool, Part XIV: The Microfibrils, in "Proc. 5th International Wool Textile Res. Conf, Aachen," Vol. II, 1975, pp. 139-151.
16.
Kulkarni, V.G. , Robson, R.M., and Robson, A., Studies on the Orthocortex and Paracortex of Merino Wool, Appl. Poly. Symp.18, 127-146 (1971).
17.
Kulkarni, V.G. , and Whiteley, K.J., A. NewBuffer System for the Ion-Exchange Resin Chromatography of Amino Acids, Textile Res. J.46, 372-374 (1976).
18.
Piez, K.A., and Morris, L., A Modified Procedure for the Automatic Analysis of Amino Acids, Anal. Biochem.1, 187-201 (1960).
19.
Sheraga, H.A. , In "Current Topics in Biochemistry," C. W. Anfinsen and A. N. Schechter, Eds., Acad. Press, New York, 1973, p. 1.
20.
Whiteley, K.J. , Balasubramaniam, E., and Armstrong, L.D., The Swelling andSupercontraction of Sulfur-Enriched Wool Fibers, Textile Res. J.40, 1047-1048 ( 1970).
21.
Whiteley, K.J. , Campbell, M.E., Siu, C., and Kulkarni, V.G., Mechanical and Chemical Properties of Wool Fibers Exhibiting Extreme Variations in Composition and Crimp Form, in "Proc. 5th International Wool Textile Res. Conf," Aachen, Vol. IV, 1975, pp. 57-66.
