[Social and hygienic monitoring of mining enterprises]. / Sotsial'no-gigienicheskii monitoring na predpriiatiiakh gornorudnogo kompleksa.

The authors justified parameters to provide social and hygienic monitoring of work conditions at mining enterprises.

[Characteristics of occupational factors and the workers' health state in strip mining of tungsten and molybdenum ores]. / Kharakteristika faktorov proizvodstbennoi sredy i sostsoianie zdorov'ia rabochikh pri otkrytoi dobyche vol'framomolibdenovykh rud.

Ores extraction in Tyrnaouz tungsten-molybdenum pool is conducted in specific climate and geologic conditions that considerably influence aimbient dust levels in open pit and mining workplaces, levels of exhaust, radioactive and explosive gases and lower those levels to the MACs or below. With regular mining equipment used, noise and vibration levels are the same as at other open pits. The stated occupational hazards could induce vibration disease and deafness in the workers.

[Morbidity with temporary disability among miners of underground and surface mines]. / Zabolevaemost' s vremennoi utratoi trudosposobnosti rabochikh pri podzemnoi i otkrytoi dobyche rud.

The authors studied morbidity with transitory disablement among miners of open and deep mines. The morbidity parameters appeared to differ reliably between deep miners and open-cut miners. The morbidity structure is demonstrated. The authors revealed strong direct correlation between the morbidity parameters and intensity of occupational hazards in the mine.

[The control of the level of nitrogen oxides in the air of mines when using diesel-drive machines]. / O kontrole za soderzhaniem oksidov azota v vozdukhe shakht pri ispol'zovanii mashin s dizel'nym privodom.

Laboratory and occupational studies evaluated up-to-date methods determining nitrogen oxides in atmosphere of mines. The authors elaborated new methods assessing nitrogen oxides in the air and suggested some improvements of the present techniques in accordance with specific conditions of mines. A novelty is a correction coefficient for assessment of nitrogen oxides through express method (indicator tubes).

[Features of work environment in open mining of gold-containing sand in the Far North]. / Osobennosti uslovii truda pri otkrytoi dobyche zolotosoderzhashchikh peskov na Krainem Severe.

Up-to-date work conditions of open extraction of gold in Far North are characterized by some occupational hazards, among which noise and vibration are leaders. In severe climate conditions heat state of the workers was considered exceeding the allowable standards. The authors suggest recommendations to normalize working environment of the enterprises under study.

[Work conditions in concentration of tungsten-molybdenum ore]. / Usloviia truda pri obogashchenii vol'framo-molibdenovykh rud.

Manifold hygienic studies carried out at Tyrnaouz tungsten-molybdenum enterprise served as example to characterize work conditions, microclimate, chemical load, levels of dust, noise, vibration and radiation at modern concentration enterprises. The factors leading in intensity were dust load in air during preparation of ores processing (grinding, grist, etc.), noise, and microclimate especially during cool season. Hygienic importance of occupational factors is shown by data on morbidity with transitory disablement and outpatient medical examinations.

[Physiologic and hygienic characteristics of work conditions of miners in the Far North]. / Fiziologo-gigienicheskaia kharakteristika uslovii truda gornorabochikhrossypnykh shakht Krainego Severa.

Workers engaged into subsurface extraction of sand containing gold were proved to work in difficult conditions characterized by stable negative temperatures, high concentrations of dust, elevated levels of noise and vibration. The drill operators demonstrated extremely unfavorable changes of physiologic processes within a shift. Those changes were compromised cardiovascular regulation, early occurrence and intensive progress of fatigue. The authors provide recommendations to normalize the work conditions and to create rational scheme of work and rest for the occupations.

[Clinical and hygienic aspects of the effect of antimony ore on workers in the Far North]. / Klinico-gigienicheskie aspekty vozdeistviia antimonitovykh rud na organizm rabotaiushchikh v usloviiakh Krainego Severa.

The clinical and hygienic studies performed at the antimonite ore extraction mines in Yakutia revealed that the workers were exposed to high concentrations of polymetallic dusts, containing chromium dioxide, antimony, arsenic and their compounds. 11% of the workers exhibited dust bronchitis, changes in the blood and immune reactivity indices which were due to reactions of adaptation to the Far North climatic conditions and the occupational factors' toxic effects.

[Ion currents through batrachotoxin-modified sodium channels of node of Ranvier membranes at high positive and negative potentials]. / Ionnye toki cherez modifitsirovannye batrakhotoksinom natrievye kanaly membrany perekhvata Ranv'e pri vysokikh polozhitel'nykh i otritsatel'nykh potentsialakh.

Ionic currents through batrachotoxin-modified sodium channels in frog nerve fibres were measured over a wide range of membrane potentials. At potentials above +80 mV currents decay in time and their steady-state level decreased as potentials increased. "Instantaneous" current measurements have shown that this phenomenon was due to the decrease in net channel conductance. Scorpion toxin affected current kinetics only slightly at these potentials, which suggested that these decays were not caused by usual inactivation process. Externally applied procaine induced slow (tens of ms) potential-dependent block of batrachotoxin-modified channels at large positive potentials. At large negative potentials (above -100 mV) "instantaneus" currents decreased due to fast voltage-dependent block of the channels by calcium ions.