[Hygienic evaluation of direct heating of the air delivered to the shaft].

The paper gives the results of exploring a test pre-heating system for the air (APHS) delivered to the shaft. The system has been first used in the Urals. The supply air is heated by burning natural gas in the air current. The APHS system with a RG air heater (000 "Gas-Engineering") is equipped in addition to the existing heaters to enhance heat supply reliability in northern conditions. The data of the studies show that in all periods of the heating season (interseason, moderate frosts, the coldest month), the concentrations of hazardous substances, such as nitric oxides, nitric dioxide, sulfur dioxide, carbon dioxide, benz(a)pyrene, solid aerosol in the shaft-delivered air, do not exceed those given in the existing regulation provided that the design operating conditions are met. With the maximum gas consumption, the coldest month only was marked by the nitric dioxide content being greater than the standard values, causing the maximum projected natural gas consumption to be lower in the APHS system. The air level of nitric dioxide proved to be a major hygiene indicator while using this air heater.

[Topical aspects of occupational hygiene in the manufacture of novel types of periclase carbon refractory bricks].

Comprehensive hygienic studies conducted at the Pervouralsk plant of refractory materials at the section of spinel periclasocarbonated refractory materials in the workshops for preparing and pressing refractory mass have shown that silicon-containing dust that is a mixture of various chemicals entering the air of a working area. In the refractory mass preparation workshop, the concentrations of a number of substances, such as magnesium oxide, phenol, formaldehyde, exceed their maximum allowable levels. In the pressing workshop, the workers are exposed to high noise levels. The working process in the study workshops is considered to be rough labor.

[Psoriatic arthritis: combined treatment with prospidin and methotrexate].

AIM: To compare clinical efficacy of methotrexate monotherapy and methotrexate combination with prospidin in patients with psoriatic arthritis (PA). MATERIAL AND METHODS: Sixty three patients (42 females and 21 males) with documented PA, generalized articular syndrome of the second-third degree of activity were divided into two groups. Patients of group 1 (n = 30) received combined therapy (i.v. prospidin 200-300 mg/week + i.m. methotrexate 10 mg/week). Maintenance consisted of prospidin in a dose 100-200 mg/week i.m., methotrexate dose was the same. Patients of group 2 (n = 33) were given methotrexate monotherapy in a dose 10 mg/ week i.m. RESULTS: In the first three months of the study and in maintenance therapy, combined treatment was more effective. By ACR criteria, 50-70% response was achieved after 12 months of treatment in 44 and 27.3% patients of groups 1 and 2, respectively. The number of side effects and drug-related withdrawals was 23.3 and 36.4%, 10 and 15.1% in groups 1 and 2, respectively. CONCLUSION: Combination of methotrexate with prospidin produced an earlier and more potent positive clinical effect than methotrexate alone in PA patients.

[Cloning of the gene leg-arista-wing complex and analysis of its mutant derivatives in Drosophila]. / Klonirovanie gena leg-arista-wing complex i analiz ego mutantnykh proizvodnykh u drozofily.

Insertion of a double copy of P element was shown to be the cause of the lawcp1 mutation. Mapping and cloning of a DNA fragment bearing the lawc locus was carried out. New alleles of this gene were characterized.