Author: James Law

Publisher: Forgotten Books

Published: 2015-07-05

Total Pages: 734

ISBN-13: 9781330728017

Excerpt from d104 Veterinary Medicine, Vol. 4 The power of the agglutinins survives a temperature of 60 C. But is lost at 65 C. Thus by heating a serum to 55 C. The haemolytic action is destroyed While the action of the agglutinins is retained. Precipitins. If a rabbit is injected with the serum of horse, chicken or eel, and the serum of this rabbit is later mixed with the serum of a horse, chicken or eel, as the case may be, the latter becomes cloudy by reason of the precipitation of a portion of the albumen. The substances in the rabbit's serum which de termine the precipitation of a portion of the albumins are known as precipitins. Leblanc finds that in the majority of cases the precipitate is made up in part of albumin from the serum operated on, but mainly of pseudo-globulin from the specific serum. The specific serum may operate equally on the serum of two nearly related animals'. Thus the serum taken from the rabbit which had been first injected with chicken serum, precipitates the normal serum of both chicken and pigeon. These two animals are supposed to have common receptors. Without going further in the elucidation of precipitins and their relations, it may be said that in them as in the agglutinins we have to a certain extent a parallelism with the production of antitoxins by the introduction into the living -body of the toxins of a given disease. No method for the utilization of the precipitins for protective purposes has been successfully worked out, yet they have been availed of to differentiate the flesh of one animal from that of another for which it has been sub stituted - the flesh of the horse from that of the ox, or that of the dog from that of the sheep. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.