[Forced expiration and inspiration under hyperbaric conditions].

In 37 healthy men aged 23-53 years the ratio of one-second and forced vital capacity of the lungs during forced inspiration and expiration FIV1/FIVC and FEV1/FEVC was recorded, (i.e. 0.

[Chromosome aberrations in workers in a printing press].

Using cytogenetic analysis of peripheral lymphocytes the authors examined three groups of subjects: 42 rotogravure printers exposed to toluene in concentrations of 400-4400 mg.m-3 for a mean period of 13 years, 28 administrative employees of the printing plant exposed to low concentrations of toluene (8-16 mg.m-3) in their offices, whereby more than half of them spent on average two hours in the photogravure workshop, and 32 control subjects.

[The effect of exposure to silicon dioxide on the occurrence of porphyria tarda].

The incidence of porphyria cutanea tarda was studied in two groups of silicon dioxide risk workers and compared to that in a control group. In the group with higher exposure to SiO2 the illness occurred in 12 out of 440 workers, in the group with lower exposure in 12 out of 1000 workers. In the control group porphyria was found in 18 out of 12,100 individuals examined.

[The effect of exposure to silicon oxides on the occurrence of porphyria cutanea tarda].

The incidence of porphyria cutanea tarda was studied in two groups of silicon dioxide risk workers and compared to that in a control group. In the group with higher exposure to SiO2 the illness occurred in 12 out of 440 workers, in the group with lower exposure in 12 out of 1000 workers. In the control group porphyria was found in 18 out of 12,100 individuals examined.

[Occurrence of symptomatic liver porphyria in workers at risk for exposure to free SiO2 during subway construction].

Symptomatic hepatic porphyria was followed up in workers exposed to the risk of free SiO2. This disease was found in 12 out of 998 workers engaged in the construction of the underground and exposed to SiO2 (group I), and in 12 at-risk persons out of 440 patients from different workplaces who were hospitalized for SiO2 exposure (group II). The average age of the workers of group I was 40.

[Excretion of phenoltetrachlorophthalein in the bile in rats].

Phenoltetrachlorphthalein secretion into bile was followed in Wistar strain rats intoxicated per os by tetrachlormethane (0.25, 0.50, 2.