Rat tail collagen type

Rat-tail collagen type I extruded fibers tested after stretching from 0 to 50%. 

Type I rat tail collagen, 3-4 mg/ml solution (Becton-Dickinson). 

Elastic and viscous stress-strain curves can be experimentally determined from incremental stress-strain curves measured on samples of different tendons. Typical elastic and viscous stress-strain curves for rat tail and turkey tendons are shown in Figures 7.4 and 7.5. For both types of tendons the curves at high strains are approximately linear. As we discuss in Chapter 8, the elastic modulus can be calculated for collagen, because most of the tendon is composed of collagen and water, by dividing the elastic slope by the collagen content of tendon. When this is done the value of the elastic modulus of collagen in tendon is somewhere between 7 and 9 GPA. 

Type I collagen, rat tail tendon, aggregates inO.OlMHCl... 

Since the first observation of SHG from collagen ecus tissues in 1971 by Fine and Hansen [8], collagen fibrils provide excellent contrast in biological SHG microscopy, including the first SHG microscopy study of connective tissues in 1986 by Freund, Deutsch, and Sprecher [9]. Freund and his coworkers attributed the SHG generation to the polarity (that is one type of non-centro-sym-metry) of rat-tail tendon, which was then correlated to polar collagen fibrils. In... 

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