[Estimate of the dose in the marrow and the gonads of patients undergoing neoplastic treatment with telecobalt therapy (author's transl)].

Measurements of the doses were carried out on phantoms in order to determine the dose in the marrow and gonads of patients undergoing radio-therapeutic treatment with telecobalt therapy with fixed fields. On average, the dose in the marrow for each treatment resulted to be 2.35 Gy in the male and 5.

Biosynthesis of vitamin B12: nature of the volatile fragment generated during formation of the corrin ring system.

It is shown with the help of radiolabeled substrates that biological formation of the corrin ligand system of cobyrinic acid is linked with the release of an equivalent of acetic acid from a hydroporphinoid precursor in which the C-20 atom has undergone methylation prior to its excision from the macrocycle.

[Determination of the genetically significant dose from x-ray diagnosis in the Province of Varese (author's transl)].

The genetically significant dose in the population of Varese Province (about 700,000 inhabitants) from X-ray diagnosis in 1972 has been estimated. The methods adopted and data utilized for the estimate are indicated. Results are discussed in view of the possibility of reducing doses.