3-Carbamoyl-2,2-dimethyl-cyclo-pentane-1,1-dicarb-oxy-lic acid.

In the title compound, C(10)H(15)NO(5), the five-membered cyclo-pentane ring has an envelope conformation, with four atoms lying in a plane (mean deviation = 0.0213 Å), while the fifth atom deviates from this plane by 0.626 (2) Å.

[The effect of adding Laminaria japonica to food on the long-term effects when combined with radiation injury].

Irradiation of rats by 131I (10 Gy) incorporated in the thyroid and by 137Cs external source (6 Gy) was made. Part of animals received a ration with Laminaria that reduced a rise in frequency of leukemia, other malignant tumors and increased latent period of tumor formation.

[Study of the anticarcinogenic characteristics of the trace element, selenium, sanitary-hygienic experiment].

Enrichment of rat daily diets by 1-2 (up to 5) mg selenium increased nonspecific resistance of animals to ionizing radiation. Incidence of mammary, pituitary, and thyroid tumors as well as of leukemia were lower as compared with control animal group given no selenium.