BIOPHYSICS

M. A. Ostrovskii, I. B. Fedorovich. Enzymatic (ATPh-atic) activity of digitonin extracts of rhodopsin (visual purple), and its variation under the influence of visual light . . . . . . . . . . . . . . . . . . 1412

BIOCHEMISTRY

Z. S. Gershenovich, A. A. Krichevskaia, V. I. Shumskaia. The specificity of the relations between γ-aminobutyric acid and brain proteins . . . 1415

A. I. Oparin, K. B. Serebrovskaia, G. I. Lozovaia. The photosensibilizing activity of a chlorophyll in the phosphatide-protein coacervate system . . . 1418

Iu. N. Polianskii. Gel thixotropy of actomyosin and myosin . . . . . . 1420

BOTANY

I. G. Zoz, N. F. Komissarenko, V. T. Chernobai, D. G. Kolesnikov. Taxonomy and biochemistry of certain species of the genus Cachrys L. emend. Koch. . . . . . . . . . . . . . . . . . . . . 1423

PLANT PHYSIOLOGY

V. F. Gavrilenko, B. A. Rubin. On the problem of Mg-porphyrin synthesis in isolated roots . . . . . . . . . . . . . . . . . . . 1427

I. A. Shul’gin, Kh. A. Moldau. On the problem of luminosity spectrum coefficients of plant leaves in natural and polarized light . . . . . . 1430

PHYSIOLOGY

L. M. Vdovichenko, N. N. Demin. Acetylcholine and respiration of mitochondria in brain cells . . . . . . . . . . . . . . . . . . 1434

E. K. Davydova. Variation of excitability in the cortical representation of signal stimulant, taking place as a result of formation of conditioned food reflex . . . . . . . . . . . . . . . . . . . . . . 1437

O. M. Lezhneva, E. S. Ievleva, L. A. Zil’ber. Humoral antibodies against methylcholanthrene-induced sarcomas . . . . . . . . . . . 1440

R. M. Meshcherskii, G. G. Lezhava, N. A. Lazareva. Corticofugal variations in EKB responses of monopolar and bipolar potential records . . . 1444

LETTER TO THE EDITOR

In our article (S. N. L’vov, V. F. Nemchinov, T. Ya. Kosolapova, G. V. Samsonova, “Physical Properties of Titanium Carbide in the Homogeneity Region”), published in DAN, vol. 157, no. 2, 1964, through our fault an error was made in the concluding part of the article on p. 411 (2nd paragraph from the top). In this connection the part of the paragraph beginning with the words “In this case a certain regularity is observed...” and to the end of the paragraph should read:

In this case a certain regularity is observed in the temperature dependence of the electrical resistivity and thermoelectric emf on composition: with an increase in the carbon content, the angle of inclination of the $\rho$—temperature curves increases linearly, while that of the $\alpha_T$—temperature curves decreases linearly (Fig. 4). The strengthening of the dependence of electrical resistivity on temperature with increasing carbon content in titanium carbide may be associated with a relative increase in the role of scattering of current carriers by thermal vibrations in comparison with the role of their scattering by lattice defects of the unsaturated carbide, when the number of these defects decreases upon approaching the stoichiometric composition. Evidently, in unsaturated carbides this factor has a more substantial significance than the increase in lattice rigidity, which also leads to the observed rise of the electrical-resistivity—temperature curves as the carbide lattice becomes saturated with carbon.

S. N. L’vov
V. F. Nemchinov
T. Ya. Kosolapova
G. V. Samsonova

T-08058
Signed for printing 12/VI-65.
Print run 4315 copies.
Order No. 2389
Paper format 70×108¹/₁₆
Printed sheets 22.4 + 5 inserts
Paper sheets 8
Publisher’s accounting sheets 23.1

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