Iu. A. Krugliak, V. I. Danilov, V. M. Gaidai. Registration of tautomeric forms of bases in the process of construction of a genetic code . . . . . . . . . . . 201

E. A. Morozova, L. V. Ionova, S. A. Pliner. Cyclization of tetrapeptides under application of ethoxyacetylene as a condensation agent . . . . . . . . . . . 203

I. B. Naumova, M. Sh. Zaretskaia. Certain properties of glycerol teichoic acids isolated from Actinomyces rimosus T-118 and Actinomyces antibioticus 39 . . . 207

A. I. Oparin, E. F. Kharatian, N. S. Gel’man. Localization of hydrogenases and their relation to oxygen in cells of Lactobacterium pentoaceticum . . . . . . 211

PLANT ECOLOGY

L. E. Rodin, N. I. Basilevich. The biological productivity of the main types of vegetation of the Northern hemisphere of the Old World . . . . . . . . . . . 215

PLANT EMBRYOLOGY

E. V. Ivanovskaia. Disturbance of tissue differentiation in hybrid systems (in embryos and endosperm of wheat and rye) . . . . . . . . . . . . . . . . . . . 219

PLANT PHYSIOLOGY

V. M. Kutiurin, M. V. Ulubekova, N.-M. Nazarov. Effect of oxygen concentration upon the rate of photosynthesis and respiration in aquatic plants . . . . . . 223

ZOOLOGY

V. I. Lukianenko. The immunobiological affinity of three Acipenseridae species . . 227

PHYSIOLOGY

E. V. Zeimal’. A description of central choline-receptors stimulated with nicotine . . 230

S. V. Magaeva. A physiological analysis of disturbances in the regionary blood-circulation in the process of developing nerve distrophy . . . . . . . . . . . 233

ENDOCRINOLOGY

A. A. Voitkevich, L. K. Leonova. Some data on the influence of vertebrate hormones on the neurosecretory system of insects . . . . . . . . . . . . . . . . 236

CORRECTIONS

In the article by L. N. Neokladnova and G. A. Shagisultanova, “The action of γ- and ultraviolet radiation on aqueous solutions of the triethylenediamine complex of cobalt (III),” published in DAN, vol. 149, No. 5, 1963, the caption to Fig. 1 should read: Absorption spectra of solutions of \([\mathrm{Coen}_3]\mathrm{Cl}_3\), irradiated by a γ-source with a total dose of 285000 r, at the final initial solution concentration of 0.01 M (1), 0.002 M (2), and 0.001 M (3); 4, 5, 6—freshly prepared irradiated solutions of concentrations 1, 2, 3 respectively; 1′, 2′, 3′—the same as 4, 5, 6 with solution age of 20 days.

In the article by M. B. Shtark, “On the histochemistry of glycogen in the brain of hibernating animals,” printed in DAN, vol. 153, No. 5, 1964, an error was made: in Fig. 3 the fourth rectangle, denoting the maximum glycogen content (400–600), should be shaded with dotted hatching, and not solid black, which denotes the ventricular cavities in the figure.

Signed for printing 16/VI 1964. Print run 4985 copies. Order No. 602.
Paper format 70×108 1/16. Printed sheets 21.0 + 3 inserts. Paper sheets 7½. Publisher’s sheets 21.2.
2nd printing house of the publishing house “Nauka,” Moscow, G-99, Shubinskii Lane, 10.