Studies on Shortening. II

Shortening Curves on Surfaces

METHODS of shortening a curve in a manifold have been used to establish the existence of closed geodesics, and in particular of simple closed geodesics on 2-spheres. For this purpose, a curve evolution process should (a) not increase the number of self-intersections of a curve, (b) exist for all time or until a curve collapses to a point, (c) shorten curves sufficiently fast so that curves whic...

Studies on Echinococcosis : Ii. Echinococcosis in Japan

Further Studies on Bacterial Hypersusceptibility. Ii

When filtered alkaline extracts of pulverized bacteria of several varieties are precipitated with acid in the cold, boiled with acid, and all materials thrown down by these procedures removed, there remains a small amount of an alcohol-precipitable material which no longer gives any of the ordinary chemical reactions for proteins, such as the biuret, Hopkins-Cole, Millon, and sulfosalicylic aci...

Studies on erythropoietic action of angiotensin II.

S INCE THE ESTABLISHMENT of a concept that erythropoiesis is controlled by erythropoietin (Ep), search for the production site of Ep has been one of the major projects. From the results obtained from both clinical and experimental research carried out so far, the kidney has been regarded as the organ playing an important role in the production of Ep. However, the mechanism of the production is ...

Electron microscopic studies on developing cartilage II .

A procedure for the study of glycogen in the same cell, under both light and electron microscopes is described. The synthesis and accumulation of glycogen is a feature of chondrogenesis in the mouse epiphyseal cartilage and the amount of glycogen increases with the progress of differentiation. In contrast, no glycogen was detected in differentiating epiphyseal cartilage of the chick at any stag...