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[Disacarification in the prevention of allergic diseases].

Elimination of domestic dust mites (Acariformes: Pyroglyphidae) from the premises is a significant factor of improving the quality of life in individuals with mite-borne sensitization. Some ways of reducing the number of domestic dust mites in the premises are considered.

2-Propanol↗
PubMed1992

[Peripheral vision in copper mine workers].

Eighty-two copper mine workers were subjected to an examination performed twice a day. Field of vision and eye's resolving power were examined in all subjects. Preliminary examination was performed above ground before the miners started their work and later, after five hour's work under ground. During the follow-up examination the limitation of the field of vision was found in 64% of face foremen and in 13.6% of off-face miners. This limitation was observed in the lower temporal quadrants. The limitation is probably of central origin and is connected with the effects of occupational agents, eg. noise. The eye's resolving power assessed under ground was statistically remarkably lower than above ground. However, taking into consideration the inadequate lighting, one might expect more serious changes of this characteristic.

Adult↗
PubMed2006

[Dynamic model of rice tiller in FACE].

With Japonica cultivar Wuxiangjing 14 as test material, a free-air CO2 enrichment (FACE) experiment was conducted at Anzhen and Wuxi of Jiangsu Province in 2001 to approximately 2003. The target CO2 concentration of FACE plots was 570 micromol x mol(-1), 200 micromol x mol(-1) higher than that of ambient air. Three levels of N were supplied as LN (150 kg x hm(-2)), MN (250 kg x hm(-2)) and HN (350 kg x hm(-2)). The effects of FACE treatment on the dynamics of rice tiller was studied, and the simulation model was established as Tt = ((A1/1 + e(a1-b1t)) - (A2/1 + e(a2-b2t)) + C) x ((B1/(1 + e(a3-b3t) - (B2/1 + e(a4-b4t))+D) Where Tt was the numbers of rice tiller in t days after transplanting; A1 and A2 were the maximal tillers of production and death under ambient air, respectively; B1 and B2 were the maximal potential tillers of production and death under FACE, respectively; C was the coefficient of CO2 concentration; D was the initial tillers after transplanting; and a1, a2, a3, a4, b1, b2, b3 and b4 were the control coefficients of the model. The dynamics of tiller numbers with the days after transplanting was described, and the model fitted well under ambient air and FACE conditions. Through testing with different year experimental data, the maximum and minimum RMSE was forecasted as 44.27 and 13.96 ind x m(-2), respectively, suggesting that the model was accurate and applicable.

Air↗
PubMed1991

[Combined effects of noise and heat and the evaluation of their biological equivalency].

The article contains a review of medical literature data on the complex action of noise and heat on man and laboratory animals, which prove without doubt a synergic nature of their complex action, whereas their effect on the audiofunction is near to an additive one. To perform hygienic assessments of their action, in addition to the typology of the complex action, it is proposed to use the biologic equivalent index which reflects the dosage-relationship of the two factors. It is indicated that the index is equal to 0.4-3.3 degrees C/dBA for different figures, being greater in respect to specific indices as compared with non-specific ones. More research should be made into this important problem.

Auditory Threshold↗
PubMed1991

[Sanitary chemical research on the atmosphere in wards for cardiac patients].

Man passes a greater part of the day-and-night in closed premises. The pollutants of the inside air, in quantity and quality are more various than that of the atmospheric air, which is due to the additional sources of pollution. The investigation performed is part of a complex study and hygienic assessment of the environment in the hospital rooms of two cardiological wards in view of the prevailing contingent of patients with heart diseases and their specific sensitivity to its qualities. The chemical state of the aerial environment was traced according to several basic indices: concentration of CO2, ammonia, total content of organic substances (oxidizable) and some pollutants, migrating from the polymeric materials, used for furnishing of the hospital rooms. The results received show the necessity for strictly following the regime of ventilation, ensuring the indispensable area for each patient and high light for the rooms. In view of economy of time, labour and means it is recommended the determination of oxidizability and content of ammonia in the air to be carried out one daily. It is also recommended to use synthetic polymer materials in the hospital premises subject to enforced sanitary protection, as little as possible.

Air↗
PubMed1991

[Occupational exposure to asbestos-containing dust at the plants manufacturing and using asbestos products during the years 1986-1989].

During 1986-1989, dust levels at workplaces in 19 plants manufacturing or using asbestos products in Poland were measured. Total dust concentrations were determined by the gravimetric method and respirable asbestos fibre concentrations were determined by the phase contrast optical microscope method (PCOM). Air was sampled at the breathing zones of the workers by using Casella personal air samplers. Average respirable asbestos fibre concentrations at the workplaces were from 0.06 fibre/cm3 (control desk operator) to 2.25 fibre/cm3 (spinning machine operator), and the average total dust concentrations were from 0.7 mg/m3 (technicians) to 2.3 mg/m3 (preparatory department workers). Compared with the 1980-1985 period, total dust concentrations were 1.5 times, and respirable asbestos fibre concentrations 2.9 times lower. Considering the obtained data and the analysis of the occupational diseases in workers exposed to asbestos dust during 1983-1988, the national expert group for industrial dusts has suggested that the MAC values for chrysotile dusts be lowered to 1.0 mg/m3 (total dust) and 0.5 fibre/cm3 (respirable fibre).

Air Pollutants, Occupational↗
PubMed1991

[The hygienic characteristics of the working conditions in the modern electroplating industry].

The contributors propose a set of newly performed hygienic studies in the widely developed technologies of electrotype, expound a complex of the hazardous occupational factors commonly encountered in modern galvanoplastics, contamination of the equipment, overalls and the skin with the metallic compounds contained in the galvanic electrolytes. Shops with non-isolated electrotype lines were characterized by the most unfavourable labour conditions.

Aerosols↗
PubMed1991

[Mortality in the workers in the tire industry].

The article is concerned with a study of the mortality rates among the workers engaged at a tire-producing plant, for the 1950-1979 period. In comparison with the control population group, the contributors revealed increased mortality rates caused by cardiovascular diseases, malignant neoplasms, accidents, intoxications and traumas. Analysis of the labour conditions proved the influence of the unfavourable occupational factors on the mortality rates and mortality causes, excepting the indices of mortality caused by accidents, intoxications and traumas.

Automobiles↗