Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 21

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The geochemical analysis of biogenic sediments was used to reconstruct environmental conditions and the impact of human activity from a small mire geo-system in the Sandomierz Basin (Poland SE). Changes in the nature of selected geochemical indicators show a significant impact on the transformation of the mire during the early stages of human activity. It is reflected in the geochemical record by means of a high proportion of heavy metals – cadmium, lead and copper. Evident variability of main geochemical components concentration is also visible in a vertical record of analysed cores. This is a consequence of the sedimentary basin asymmetric configuration and the ensuing variable biogenic sedimentary succession.
The immunological effects of the environmental and/or occupational exposure to NO2 and NO in air as polluting gases have been examined in groups of 16 men. The determina-tion of NO2 and NO concentrations in ambient air in the work enviroment as well as in ambient air in residential areas of these men was performed, always by use of an Amaya-Sugiura passive sampling spectrophotometric method. Mean concentration of NO2 in ambient air in residential areas was 0.0210 mg x m-3 (0.0070 to 0.0470). NO2and NO mean concentrations in ambient air in the work enviroment were 0.0867 mg x m-3 (0.0165 to 0.1960) and 0.0614 mg x m-3 (0.0220 to 0.1090) respectively. For the determination of T-cell and (CD19+)B-cells populations Behring monoclonal antibodies were used in indirect immuno-fluores-cence tests. The serum levels of immunoglobulins: G, A, M, E; C3c and C4 complement components; total circulating immunological complexes (CIC) as well as acute phase proteins: C-reactive protein (CRP), haptoglobin, ceruloplasmin and transferrin were determined by nephelometry. Stimulation T-cell line in exposed to NO2 and NO was evidenced by in-creased number of (CD3+)T-cells, by about twice (p<0.001) increased number of (CD4+)T-helper cells and by increased number of (CD8+)T-suppressor cells. The higher increase in count of (CD4+)T-helper cells than (CD8+)T-suppressor cells population caused the increased value of the (CD+4)T-helper/(CD8+)T-suppressor ratio by about 25% (p<0.01) in the men exposed to NO2 and NO. No changes were observed in the number of (CD19+)B-cells as well as in the (CD3+)T/(CD8+)T-suppressor ratio. In men of exposed to NO2 and NO elevation of IgG serum concentration by a 17.7% (p<0.01) was evidenced as well as decreased of C3c by 18.6% (p<0.001) and C4 by 35% (p<0.001), whereas total CIC in serum was elevated by about twice (p<0.001). Significant positive correlations between concentrations of NO2 in air and numbers of total lymphocytes, (CD3+)-cells, (CD4+)T-helper, (CD8+)T-suppressor cells or IgG (/r/ from 0.31 to 0.71) as well as significant negative correlations between concentrations in air of NO2 and IgE, C3c, CRP or haptoglobin (/r/ from -0.49 to -0.31) were calculated. Moreover, significant positive correlation between NO concentrations in air in work place and counts of (CD3+)T-, (CD8+)T-suppressor, (CD19+)B-cells and levels in serum of C4, haptoglobin and ceruloplasmin (/r/ from 0.33 to 0.63) as well as significant negative correlations between NO concentrations in air in work place and serum levels of IgG, IgA and IgM (/r/ from -0.67 to -0.47) were also observed. In conclusion, environmental exposure to NO2 and NO can modificate in the peripheral blood of humans the parameters of cell-mediated and/or humoral immunity.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.