Effects of ventilation rate per person and per floor area on perceived air quality, sick building syndrome symptoms, and decision-making.

Unlabelled: Ventilation rates (VRs) in buildings must adequately control indoor levels of pollutants; however, VRs are constrained by the energy costs. Experiments in a simulated office assessed the effects of VR per occupant on perceived air quality (PAQ), Sick Building Syndrome (SBS) symptoms, and decision-making performance. A parallel set of experiments assessed the effects of VR per unit floor area on the same outcomes.

[Chromosome aberrations in different tissues of the murine rodents and amphibians from radionuclide-contaminated regions of Belarus].

Cytogenetic investigations of amphibian and rodent populations from the contaminated by radionuclides regions of Belarus was conducted. A significant increase in the levels of cytogenetic anomalies in bone marrow cells and intestinal epithelium of amphibians and rodents, the levels of alveolar macrophages of rodents, and micronuclei in peripheral blood erythrocytes of amphibians was revealed. Presence of chromosome type aberrations indicates that radiation as a mutagenic factor was involved.

[The genetic monitoring of populations of brown frogs inhabiting radionuclide-contaminated regions of the Republic of Byelarus].

Genetic monitoring of brown frog populations inhabiting radiocontaminated areas of Belarus (contamination range: 177-2331 kBq/m2 for 137Cs; 3.7-284 kBq/m2 for 90Sr) has shown that the frequency of aberrant metaphases in bone marrow cells of animals from the contaminated areas is 3 to 10 times as much as that of the control, aberration load of cells being also higher. The aberration spectrum differs from a spontaneous one.

[Polymorphism for supernumerary chromosomes in populations of Rana temporaria L].

Occurrence of B-chromosomes in four populations of Rana temporaria L. in Minsk, its suburb and Berezinskiĭ biosphere reserve has been studied. The percentage of individuals with B-chromosomes and the average number of B-chromosomes per genome are shown to multiply increase in the population inhabiting for 40 years in the region polluted with waste products.

[Effectiveness of selection for thorax length in model Drosophila populations in chemical mutagen exposure].

Artificial selection for increasing and decreasing Drosophila thorax length was carried out over 20 generations. Chemical mutagen, dimethylsulfate (DMS) was regularly applied to enhance genetic variation in selected lines. It was determined that under the influence of mutagen the efficiency of selection for decreasing thorax length was much higher, while selection course for increasing thorax length was not affected significantly.