A revised morphological model for the crimp structure of tendon is presented. The 300-500 mu diameter tendons of the mature rat tail are comprised of from one to more than ten substructures, called fascicles, of 80-320 mu diameter. Fascicles each possess a "crimp structure" demonstrable in the polarizing microscope and neighboring fascicles within a tendon usually exhibit crimp registry. The fascicle itself is shown to be a cylindrical array of planar-zig-zag crimped 500-5000 A diameter collagen fibrils. The approximate cylindrical symmetry of the fascicle is domonstrated by SEM not equal to and polarizing optical microscopy. A method of replacing native water with other liquids of refractive index near to that of collagen is utilized to reduce or eliminate light diffusion and therby greatly improve OM observations. Small bunches of collagen fibrils removed from the tendon are shown to exhibit the simple planar zig-zag morphology described in previous literature. The planar crimping of collagen fibrils and their assemblage into cylindrically symmetric fascicles is verified by small angle X-ray diffraction.
Summary65Zn was found to be present in rumen digesta after a single dose of 65ZnCl2 was administered intravenously; the maximum level was reached approximately 3 days after the dose was given. After a single dose of 65Zn Ch was administered intraruminally, 65Zn disappeared exponentially from the rumen, the time taken for the quantity present in the rumen to halve being 0·6-0·7 days. It was calculated that in 7 days following intravenous injections of 65ZnC12, 1-2% of the injected dose was transferred to the rumen; transfer appeared to take place through the rumen epithelium as well as via saliva.
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