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A mixed-function oxidase that requires reduced nicotinamide adenine dinucleotide phosphate, is carbon monoxide sensitive, and is drug-metabolizing is present in human lymphocytes and is increased to different levels by treatment with phytohemagglutinin, pokeweed mitogen, and a polycyclic hydrocarbon.
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The possibility of BP synthesis in plants was studied. Seeds of pea, lupine, rye, oats, garden-cress were investigated in hydroponic systems with substrates containing carbon and without it. The results indicated that the quantity of BP in the seeds increased in the course of germination in solutions with carbon from 1 to 7 mug/Kg of dry weight. No increase of BP was observed after germination in media without carbon.
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In 4 series of experiments a dependence between 3,4-benzpyrene (BP) output and the temperature of fir sawdust pyrolysis under isothermic conditions has been investigated. The experimental series differed in the duration of wood pulp particles stay in the reaction zone (tau). Also EPR spectra of pyrolysis products have been recorded. The experimental series did not differ in an output of ether extract from pyrolysis products, while BP output temperature curves in their shape were found to be largely dependent on tau: with an increased tau these curves definitely showed the maximum in the range of 300-350 degrees C and the BP output raised in the range of this maximum and also at the temperature of 600 degrees C. In the temperature range over 350 degrees C the character of dependence of the EPR signal value on temperature would correlate well with the temperature-dependent BP output, in the range of lower temperatures the EPR signal was not detected. The data obtained are considered as an evidence of two processes of BP formation in wood pyrolysis-a high-temperature process (temperature over 500 degrees C) and low-temperature one (300-350 degrees C). The high-temperature process seems to have the free-radical mechanism of BP formation, whereas in low temperatures it is evidently the result of a ion type reaction.
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The authors carried out some series of experiments under the conditions of organ cultures of lungs of mice, treated with urethane and 3,4-benzpirene. They succeeded lung culturinf up to 14-th and 21-th day. Growths of bronchial and bronciolar epithelium manifested at various degree were obtained in the lung extracts from mice, treated with urethane and 3,4-benzpirene. The most manifested proliferation was observed in extracts, treated with urethane at a dose of 10 mg/ml and 3,4-benzpirene -- 64 gamma/ml.
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