[The characteristics of the biological action and regulation of submicroscopic aerosols in the industrial environment]. / Ob osobennostiakh biologicheskogo deistviia i reglamentatsii v proizvodstvennoi srede submikroskopicheskikh aérozolei.

Biologic action was studied of the silicon nitride powder with varying disperse composition. When producing and using the silicon nitride powder on an enlarged scale one must remember of its higher toxicity and fibrogenicity. There is a need of employing some method of determination of the submicroscopic aerosol disperse composition under industrial conditions.

[The fibrogenic property of mineral wool dust obtained from ferronickel slags]. / O fibrogennosti pyli mineral'noi vaty, poluchennoi iz ferronikelevykh shlakov.

Dust of mineral wool obtained from ferronickel slags was demonstrated to be capable of inducing moderate pneumofibrosis. Small contents of manganese, nickel, chrome and cobalt in the mineral wool particles necessitate further investigations for their probable mutagenic effect.

[The alkaline phosphatase and aminotransferase activity of the blood serum and liver in rats with chronic poisoning by the dust from a mineral wool made of ferronickel slag]. / Aktivnost' shchelochnoi fosfatazy, aminotransferaz syvorotki krovi i pecheny krys pri khronicheskoi intoksikatsii pyl'iu mineral'noi vaty iz ferronikelevogo shlaka.

The authors investigated the activity of alkaline phosphatase, alanine- and aspartate-aminotransferases of the blood serum, mitochondria and postmitochondrial fraction of the liver in conditions of administration of mineral cotton from ferronickel slag. It was shown that 1 and 3 months after introduction of mineral cotton dust changes occurred in the activity of these enzymes. Restoration of these enzymes occurred 6 months after introduction of mineral cotton dust.

Prevalence of refractive errors in adults over 40: a survey of 8102 eyes.

The prevalence of refractive errors was studied in an adult rural population. Of the 8102 eyes studied 18-4% were myopic, 57-1% were emmetropic, and 24-5% were hypermetropic. Mild myopia was commoner in males than in females, and mild hypermetropia was commoner in females than in males. There was increasing hypermetropia with increasing age, probably due to unmasked, latent hypermetropia up to the age of 70 years and to a true shift toward hypermetropia after the age of 70 years.