The chemical mechanism of the union between hide protein and chromium in the production of chrome leather is in doubt. Wilson2 has suggested the possibility of the interaction of the carboxyl radicals of the protein with the chromium cations. Since chrome tanning occurs in solutions which are decidedly on the acid side of the iso-electric point of collagen, the amount of ionized carboxyl groups would be exceedingly slight while the degree of ionized amino groups would be correspondingly great. This would point to the possibility of chrome fixation involving the nitrogen-containing radicals of the protein. It must be conceded, however,
Immobilisation in dorsi-flexion following K-wiring for unstable distal radial fractures does not improve functional outcome. The overall functional results were excellent and we believe that Kwiring still as a place in the treatment of distal radial fractures in the previously defined population.
THE use of aluminum salts for tannage dates back to very early times and is still applied to the manufacture of certain kinds of leather and furs. The operation involving the use of egg yolk, oil, flour, and common salt, together with a salt of aluminum, is called tawing.Ancient history tells us that the Egyptians and Romans tanned with alum and salt and, within the limits of our knowledge of ancient methods, the practice of alum tanning has undergone but negligible changes through the intervening centuries, although, of course, the nature of the final products and degree of perfection have changed markedly.
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