Keratin feather

Figure 28. Electron spectra from 2,4-D entrapped in feather keratin.

He had to discard his own elegant a-model, but with characteristic enthusiasm took up the implication of the planar amide group in the Pauling-Corey structures, considering it successively in relation to the models for wool, the cross /3-pattern, collagen, and feather keratin. 

Recent work by Harrap and Woods (1964a) suggests that a similar situation may exist in feather keratin, which they have shown to contain 1.3 acetyl groups per mole assuming a molecular weight of 10,000. 

Layers from the epidermis of the cow s lip and from the wall of the cow s hoof contract in hot water (Rudall, 1946), and feather keratin (Mandelkem et al., 1962b) and porcupine quill (Crewther, unpublished observations, 1964) contract in solutions of LiBr. 

The use of chemiluminescence technique has expanded to others natural polymers. Recently, Millington et al. reported studies on polymers such as the fibrous proteins wool and feather keratin, silk fibroin, and reconstituted collagen from bovine skin, which revealed new information about their degradation [81]. The potential of CL to analyze the effectiveness of treatments to protect the polymer during processing could contribute to diminish the loss of properties of the types of polymers widely used in textile industry. 

Fig. 9.6. Structure of (a) the keratin multigene family and (b) the keratin proteins. The multigene family comprises 18 feather keratins, three feather-like keratins and four claw keratins, contained within a 100 kb stretch of the genome. Scale keratin is larger than feather (b) largely because of the 4 X 13 amino acid residue repeat.

Presland, R.B., Gregg, K., Molloy, P.L., Morris, C.P., Gocker, LA. Rogers, G.E. (1989a). Avian keratin genes. I. A molecular analysis of the structure and expression of a group of feather keratin genes. J. Mol. Biol, 209, 549-59. 

Saucedo-Rivalcoba, V., Martinez-Hemandez, A. L., Martinez-Barrera, G., Velasco-Santos, C., Castano, V. M. (2011a). (Chicken feathers keratin)/polyurethane membranes. Add/. Phvs. A Mater. Set Proc.. 104, 219-228. 

Kavitha, A., Boopalan, K, Radhakrishnan, G., Sankaran, S., Das, B., Sastry, T., (2005), Preparation of Feather Keratin Hydrolyzate-Gelatin Composites and Their Graft Copolymers. Journal of Macromolecular Science Part A Pure and Applied Chemistry, Vol. 42, No. 12, (December 2005), pp 1703-1713, ISSN 1060-1325. 

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