[Ecologic and hygienic aspects of regulation of the maximum permissible level of water contamination]. / Ekologo-gigienicheskie aspekty reglamentirovaniia maksimalno dopustimykh nagruzok na vodnye obekty.

The research has shown that in calculation of the permissible load of a water body all compounds should be taken into account whatever their harmful limit indicator. Total loading coefficient at a level below I in all cases does not guarantee a negative influence on auto-purification process.

[Significance of Pseudomonas aeruginosa in a complex hygienic-microbiological assessment of the quality of water in Northern rivers]. / Znachenie Pseudomonas aeruginosa pri kompleksnom sanitarno-mikrobiologicheskoi otsenke kachestva vody severnykh rek.

The organism P. aeruginosa is discussed as being of priority importance in the complex sanitary-microbiological evaluation of the quality of the water taken from the Northern rivers to be used for drinking and economic purposes in conditions of the anthropogenic effects.

[A nitrate-ethanol synthetic accumulation medium for isolating Pseudomonas aeruginosa from the water of surface reservoirs and sewage]. / Nitrat-étanolovaia sinteticheskaia sreda nakopleniia dlia vydeleniia Pseudomonas aeruginosa iz vody poverkhnostnykh vodoemov i stochnykh zhidkostei.

A synthetic accumulation medium containing ethanol as the source of carbon and energy and potassium nitrate as the source of nitrogen is proposed. Potassium nitrate, serving as electron acceptor for P. aeruginosa, ensures its growth under anaerobic conditions, which enhances the selective properties of the medium. Comparison with Bonde citrate synthetic medium, broth with malachite green and glucose-peptone medium has shown the advantages of the proposed medium.

[The medium for determining the gelatinase activity of non-fermenting gram-negative microorganisms]. / Sreda dlia opredeleniia zhelatinaznoi aktivnosti nefermentiruiushchikh gramotritsatel'nykh mikroorganizmov.

To determine the gelatinase activity of Gram-negative nonfermenting microorganisms, a double-layer medium containing 2% of agar in the lower layer and 10-20% of gelatin in the upper layer has been developed. The medium ensures free access of atmospheric oxygen, possibility of rapid (24-42 h) determination of gelatinase activity at 22-25 degrees C, efficacy of the test. simultaneous determination of gelatin hydrolysis by 8-12 strains in one dish.