A. A. Zavarzin, S. I. Plotnikova. An autoradiographic and histochemical examination of neurogenic trophic ulcers of the abdominal wall in rabbits . . . 1185

ECOLOGY

R. S. Ushatinskaia. Summer diapause and secondary hibernation of Leptinotarsa decemlineata Say in the Transcarpathians . . . 1189

BIOPHYSICS

G. G. Polikarpov. On the stability of accumulation coefficients of Sr^90, Y^91 and Ce^144 in sea algae . . . 1192

Iu. A. Fedorov. Increased liability to dental caries induced by ionizing radiation . . . 1195

BIOCHEMISTRY

I. I. Pelevina, L. P. Lipchina. The effect of inhibitors of free-radical reactions on the activity of enzymes of the succinooxidase system . . . 1199

B. A. Rubin, V. F. Gavrilenko, N. V. Guzhova. A study of the synthesis of Mg and Fe-porphyrins in isolated roots . . . 1201

PLANT ECOLOGY

V. G. Karpov. Influence of tree root competition on the assimilation activity of taiga grasses in spruce woods . . . 1205

G. I. Makhonina, N. V. Timofeev-Resovskii, A. A. Titlianova, A. N. Tiurinkanov. Distribution of Sr^90 and Cs^137 among biogeocoenosis components . . . 1209

PHYSIOLOGY

L. A. Baraz. On the responsiveness of small intestine receptors to potassium ions . . . 1213

V. S. Ivlev. Energetic metabolism level in Amphioxus . . . 1217

L. V. Rosenstrauch. The effect of certain pharmacological substances on oxygen consumption by the myocardium of a “dry” isolated heart of a dog . . . 1220

PARASITOLOGY

A. I. Vigovskii, A. V. Gutzevich. Preliminary results of investigation of natural foci of lymphocytary choriomeningitis in the Western part of the Ukrain . . . 1223

V. L. Vladimirov. Morphology and biology of Posthodiplostomum cuticola (Nordmann, 1832) Dubois, 1936, the causal organism of the black-spot disease in fish . . . 1226

CORRECTION

In the article by M. Sh. Khuzurbazar, “On the theory of multiplicative groups of fields,” published in DAN, vol. 137, no. 1, 1961, on page 43, line 2, it should read

[
A_1 \supset A_2 \supset A_3 \supset \ldots,\qquad \bigcap_{j=1}^{\infty} A_j = C^{*}
]

T-09176. Signed for printing 29/IX-61. Print run 5440 copies. Order 2210.
Paper size 70×108^1/16. Printed sheets 21.2 + 5 inserts. Paper sheets 7^3/4. Publisher’s sheets 21.9.
2nd Printing House of the Publishing House of the Academy of Sciences of the USSR. Moscow, Shubinskii Lane, 10.