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Tumours in large domestic animals in the Netherlands. A pathological study of 333 tumours of farm animals in the Netherlands is presented. Most of the tumours (224) were collected at the Amsterdam abattoir over a period of five consecutive years. The incidence of different types of the tumours is compared with figures compiled in the U.S.A. Tumours in cattle and pigs were less frequent in the Amsterdam material than in the U.S.A., but the incidence in horses and sheep was higher than reported elsewhere. Tumours of the jejunum, the ovaries and to a lesser extent of the heart were more frequent, but those of the skin and male genital organs were le...
Studies into equine electrocardiography and vectorcardiography: I. Cardiac electric forces and the dipole vector theory. Theoretical consideration has been given in two horses to the properties of the electric field created by the equine heart acting as a simple electric generator. The principles of the vectorial theory have been applied to test the validity of application of the dipole concept. The cardiac electric forces, althrough complex in the immediate region of the heart, appear at the body surface in a similar form to those arising from a relatively immobile, single equivalent dipole. The potential value of the technique of vectorcardiography in cardiological investigations is briefly discussed.
A simple method for the isolation of pregnant mare serum gonadotropin. A simple procedure is described for the purification of pregnant mare serum gonadotropin (PMSG). The purification of PMSG from serum employed pH fractionation with metaphosphoric acid, alcohol precipitation, gel-filtration on Sephadex G-100, and chromatography on sulfoethyl-Sephadex C-50. The specific activity of the final product averaged 15,800 IU/mg and was obtained in yields of 50-80% of the activity initially present in unfractionated serum. The preparation obtained by this procedure has been characterized with respect to biological activity, electrophoresis on columns of polyacrylamide, ...
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