D. S. Nikolaev, K. F. Lazarev, O. P. Korn, M. I. Iakunin, V. M. Drozhzhin, A. G. Samartseva. On the isotopic composition of the uranium contained in the waters and sediments of the Black and Azov Seas . . . 187

N. A. Solodov. On the relation between ionization potentials of elements and the concentration, necessary for the formation of their own minerals . . . 190

PALEONTOLOGY

V. N. Sukachev, V. T. Sokolovskaia. The Likhvin interglacial flora in the environs of Moscow . . . 194

CYTOLOGY

K. S. Abramian, V. N. Reingold. A study of ultrastructural variations in the nuclear membrane during mitosis . . . 199

S. B. Petrikevitsch, M. N. Meissel. Localization of aromatic hydrocarbon 3,4-benzpyrene in cells . . . 203

HISTOLOGY

E. V. Prazdnikov. The reactivity of cellular elements of the blood of Oncorhynchus gorbusha embryos . . . 207

GENETICS

N. P. Dubinin, V. K. Shcherbakov, G. N. Kesler, L. A. Šyikova. The specificity of the object in induced mutagenesis . . . 210

P. G. Svetlov, G. F. Korsakova. The expressivity of the mutation forked characters in the progeny of females of Drosophila melanogaster exposed to temperature influences . . . 214

MICROBIOLOGY

N. S. Egorov, V. I. Ushakova, L. M. Nikol’skii. The ability of certain microorganisms to form fibrinolytic substances . . . 217

BIOCHEMISTRY

S. P. Avakiants. Enzymatic transformations in champagne wines under participation of β-fructofuranosidase . . . 221

G. L. Grigorian, I. G. Kharitonenkov, T. I. Tikhonenko, A. E. Kalmanson. Interaction of semiquinone-type free radicals with native and denatured desoxyribonucleic acid, as investigated by means of electron-spin resonance . . . 224

B. M. Mednikov, A. S. Antonov, A. N. Beloserskii. The molecular mechanism of the Crosier-principle in its application to the development of poikilothermal animals . . . 227

V. S. Saakov. The metabolism of violaxanthine-C¹⁴ in the leaf, and its role in photosynthetic reactions . . . 230

PLANT PHYSIOLOGY

V. N. Zholkevich, A. G. Chetverikov, A. J. Rogacheva. Respiration efficiency and concentration of free radicals . . . 234

PHYTOPATHOLOGY

V. E. Sokolova, G. N. Kazantseva, Iu. V. Zviagintseva, L. V. Metlitskii. Variation in the content of chlorogenic and coffee-acids in stored potato tubers, in varieties differing in their resistance to Phytophthora infestans . . . 237

EXPERIMENTAL MORPHOLOGY

V. V. Popov, O. P. Melikhova, Iu. P. Kozlov. The connexion between certain physical-chemical changes of irradiated skin and its ability to rapid reorganization into cornea . . . 241

PHYSIOLOGY

A. I. Bukhonova. The reparative process taking place in the case of combined influence of somatotrophine and prednisolon . . . 245

CORRECTION

In the article by V. A. Efremovich and V. I. Pupko, “Properties of Equimorphisms at Infinity,” published in DAN, vol. 160, no. 1, 1965, on p. 24, line 6, the printed formula

\[ {}'\theta = \theta' \operatorname{sgn}\theta \]

should read

\[ {}'\theta = \theta^{2}\operatorname{sgn}\theta. \]

T.-12386. Signed for printing 21/X-1965. Print run 4315 copies. Order no. 2942.
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