444 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (78) Blackburn, S. and Lowther, A. G. The action of organic acids on some fibrous proteins: the oxidation of wool keratin. Blochem. J. 49 554 (1951). (79) Asquith, R. S. and Parkinson, D.C. The morphological origin and reactions of some keratin fractions. Text. Res. J. 34 1064 (1966). (80) Crewther, W. G., Gillespie, J. M., Hatrap, B. S., O'Dormell, I. J. and Thompson, E. O. P. S-Carboxymethylkerateines. 3rd lnt. Wool Text. Res. Conf., Paris 1 475 (1965) and the references there cited. (81) Corfield, M. C., Robson, A. and Skinner, B. The amino acid compositions of three fractions from oxidized wool. Biochem. J. 68 348 (1958) Crewther, W. G. and Dowling, L. M. Effects of chemical modifications on the physical properties of wool: a model of the wool fibre. 2nd Quinquennial Wool Text. Res. Conf., Harrogate (1960) (J. Text. Inst. 51 T775 (1960)). (82) Gillespie, J. M. in Benesch, R., Benesch, R. E., Boyer, P. D., Klotz, I. M., Middlebrook, W. R. and Szent-Gy6rgyi, A. G. Sulphur in Proteins 51 (1959) (Academic Press, New York) Gillespie, J. M. and Simonds, D. H. Amino acid composition of a sulfur-rich protein from wool. Biochim. Biophys. Acta 39 538 (1960) Joubert, F. J., de Jager, P. J. and Swart, L. S. Studies on the high-sulphur proteins of reduced Merino wool. Symposium on Fibrous Proteins, Australia 343 (1968) (Butterworths, Sydney) Darskus, R. L., Gillespie, J. M. and Lindley, H. The possibility of common amino acid sequences in high-sulphur protein fractions from wool. Aust. J. Biol. Sci. 22 1197 (1969). (83) Asquith, R. S., Otterburn, M. S., Buchanan, J. H., Cole, M., Fletcher, J. C. and Gardner, K. L. The identification of ½-N-(¾-glutamyl)-•.-lysine crosslinks in native wool keratins. Biochim. Biophys. Acta 221 342 (1970). (84) Asquith, R. S. and Watson, P. A. Estimations of amide nitrogen in ¾-keratose. Text. Res. J. 35 381 (1965). (85) Lobur, V. V., Makar, I. A. and Gzhitokii, S. 2 . Keratose content in the wool of Merino sheep under different maintenance conditions. Dopov. Akad. Nauk Ukr. RSR. Ser. B. 32 71 (1970). (86) Harrap, B. S. The molecular weight of a purified high-sulphur protein derived from wool. Aust. J. Biol. Sci. 15 596 (1962) Harrap, B. S. The conformation of a soluble wool keratin derivative. Aust. J. BioL Sci. 16 231 (1963) Gillespie, J. M. The isolation and properties of some soluble proteins from wool. V. The isolation of the high-sulphur protein SCMKB2. Aust. J. Biol. Sci. 16 241 (1963) Gillespie, J. M. and Harrap, B. S. The isolation and properties of some soluble proteins from wool. VI. The physicochemical properties of SCMKB2. Aust. J. Biol. Sci. 16 252 (1963). (87) Crewther, W. G. and Harrap, B. S. Helix-rich fraction from the low-sulphur proteins of wool. Nature (London) 207 295 (1965) Crewther, W. G. and Harrap, B. S. The preparation and properties of a helix-rich fraction obtained by partial proteolysis of low sulphur S- carboxymethylkerateine from wool. J. Biol. Chem. 242 4310 (1967) Crewther, W. G. and Dowling, L. M. The preparation and properties of large peptides from the helical regions of the low-sulphur proteins of wool. J. Appl. Polym. Sci., Appl. t'olym. Syrup. 18 1 (1971). (88) Crewther, W. G., Dobb, M. G., Dowling, L. M. and Harrap, B. S. The structure and aggregation of low-sulphur proteins derived from alpha keratins. Symposium on Fibrous Proteins, Australia 329 (1968) (Butterworths, Sydney). (89) Davies, D. R. A correlation between amino acid composition and protein structure. J. Mol. Biol. 9 605 (1964). (90) Asquith, R. S. and Shaw, T. A note on the composition of the fibrillar and matrix proteins of wool. Text. Res. J. 35 670 (1965). (91) Bradbury, J. H. The structure of wool. Proc. Roy. Aust. Chem. Inst. 35 98 (1968) Robson, A. Die Struktur der Wolle. Textil-Praxis 23 106 (1968) Fraser, R. D. B., MacRae, T. P., Millward, G. R., Parry, D. A.D., Suzuki, E. and Tulloch, P. A. The molecular structure of keratins. J. Appl. Polym. Sci., Appl. Polym. Syrup. 18 65 (1971). (92) Lindley, H., Gillespie, J. M. and Haylett, T. Recent studies on the high-sulphur proteins of alpha keratins. Symposium on Fibrous Proteins, Australia 353 (1968) (Butterworths, Sydney) Lindley, H. and Haylett, T. Occurrence of the half-cystine-half-cystine sequence in keratins. J. Mol. Biol. 30 (1) 63 (1967). (93) Buchanan, J. H. and Corfield, M. C. Isolation of cystine-containing peptides from wool. J. Appl. Polym. Sci., Appl. Polym. Syrup. 18 101 (1971). (94) Asquith, R. S. and Shaw, T. A semi-quantitative investigation of the cysteic acid-containing peptides in a partial acid hydrolysate of ¾-keratose. Makrotool. Chem. 115 198 (1968) Asquith, R. S. and Parkinson, D.C. Semi-quantitative determination of some peptide sequences in wool keratin. Proc. Soc. Analyt. Chem. 5 206 (1968).

STRUCTURAL ASPECTS OF KERATIN FIBRES 445 (95) Zalm, H. and Biela, M. Ober die Isolierung tyrosinreicher Proteine aus Wolle. Textile- Praxis 23 103 (1968). (96) Haylett, T., Swart, L. $. and Joubert, F. J. Studies on the high-sulphur proteins of reduced Merino wool. II. The isolation of a homogeneous protein. Text. Res. J. 39 912 (1969) Haylett, T. and Swart, L. S. Studies on the high-sulphur proteins of reduced Merino wool. III. The amino-acid sequence of protein SCMKB-IIIB2. Text. Res. J. 39 917 (1969) Haylett, T., Swart, L. S. and Parris, D. Studies on the high-sulphur proteins of reduced Merino wool. Amino acid sequence of protein SCMKB-IIIB3. Blochem. J. 123 191 (1971) Swart, L. S. and Haylett, T. Studies of the high-sulphur proteins of reduced Merino wool. Amino acid sequence of protein SCMKB-IIIB4. Biochem. J. 123 201 (1971). (97) Coffield, M. C., Fletcher, J. C. and Robson, A. Recent work on the chemical structure of wool proteins. Symposium on Fibrous Proteins, Australia 289 (1968) (Butterworths, Sydney) Corfield, M. C., Fletcher, J. C. and Robson, A. Wool proteins in relation to wool structure. Symposium on Fibrous Proteins, Australia (1968) (Butterworths, Sydney) Cotfield, M. C. and Fletcher, J. C. Amino acid sequences of peptides from a chymotryptic digest of a urea- soluble protein fraction (U.S. 3) from oxidized wool. Blochem. J. 115 323 (1969).