T. A. Nikol’skaia. Variation in the ultra-structure of cells of Ehrlich’s ascitic cancer, acted upon by inhibitors-antioxidants . . . . . . . . . . . . . . 1438

V. A. Otroshchenko, V. N. Sakharov. Local irradiation of the cytoplasm of the cell by an ultra-violet micro-ray at various phases of mitosis . . . . . . . . 1441

BIOPHYSICS

G. V. Abagian, P. Iu. Butiagin. Sequence of free-radical reaction when protein molecules are acted upon mechanically . . . . . . . . . . . . . . . . . . 1444

BIOCHEMISTRY

G. V. Samsonov, R. B. Ponomareva, L. P. Shandalova. Change in the size of protein macromolecules when their tertiary structure is broken by the rupture of disulphide bonds . . . . . . . . . . . . . . . . . . . . . . . . . 1448

PLANT PHYSIOLOGY

B. L. Dorokhov. Variation in photosynthesis intensity in the case of cross-pollination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1452

A. T. Mokronosov, Z. G. Il’inykh. Assimilation of urea-C¹⁴ by potato plants 1454

EXPERIMENTAL MORPHOLOGY

V. A. Golichenkov, V. V. Popov, E. B. Vsevolodov. Recent data on experimental ray-induced cataract in frogs . . . . . . . . . . . . . . . . . . . . . 1458

EVOLUTIONAL MORPHOLOGY

A. V. Jankowski. The differentiation of kinetome in sapropelebiotic ciliates 1462

PHYSIOLOGY

A. M. Skorobogatova. On the role of upper respiratory ways in an organism acted upon with ionized air . . . . . . . . . . . . . . . . . . . . . . . . 1466

M. S. Iaremenko. New data on the role of hyaluronidase in the reabsorption of water and of osmotically active substances in uriniferous tubules . . . 1469

CORRECTION

From the list of authors of the article by V. G. Levich, Z. Ch. Grabovsky, and V. Yu. Filinovsky, “Kinetic and Catalytic Currents at a Hanging Drop Electrode,” printed in DAN, vol. 151, no. 6, 1963, the surname of the coauthor A. Bylina was unfortunately omitted.

In addition, through the fault of two authors (V. G. Levich and V. Yu. Filinovsky), a typographical error crept into the manuscript of the article. Formula (21) should read

\[ j=\frac{D b_{0}}{r_{0}+\sigma\mu} \left\{ 1+\frac{r_{0}}{\sigma\mu} \exp\left[ \left(\frac{1}{r_{0}}+\frac{1}{\sigma\mu}\right)^{2}Dt \right] \operatorname{erfc}\left[ \left(\frac{1}{r_{0}}+\frac{1}{\sigma\mu}\right)\sqrt{Dt} \right] \right\}, \]

as follows directly from expression (20).

V. G. Levich
V. Yu. Filinovsky