[Eimeria nordensheldi sp. n.--a new species of coccidia (Eucoccidiida, Eimeridae) from the Arctic lemming (Dicrostonyx torquatus vinogradovi)].

While studying parasites of the lemmings Dicrostonyx torquatus vinogradovi Ognev, 1948 from the coast of Wrangel Island a new species Eimeria nordensheldi was found out. Its description, figure and differential diagnosis are given.

[A comparative electrophoretic analysis of the isoenzymes in "reference" and natural strains of Trichinella].

In four enzymes among eight ones examined the differences were revealed in the intensity of staining of certain zones (G-6-P, ES) as well as in electrophoretic mobility of some loci (PGD, RGM) between the capsule forms of trichinellae and Trichinella pseudospiralis. As a result, the validity of isolation of T. pseudospiralis Garkavi, 1972 is confirmed.

[Regulation of angiogenesis and tumor growth].

The data on tumour vascularization regulating substances, their structure and mechanism of action are reviewed. The systems for testing angiogenic reactions are analyzed. The role of mast cells, lymphocytes, macrophages and leucocytes in formation of new microvessels is under discussion.