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Relations between spectral characteristics and statistical population indices of Mira type variables
Wilhelmina Iwanowska 《Astrophysics and Space Science》1968,2(1):128-133
Line and band intensities of Mira type variables from Keenan's Catalogue (1966) and some other sources are discussed in relation to statistical population indices characterizing positions and motions of these stars. Residual intensity estimates of Ca 4226, Cr 4254, TiO, VO, ScO, YO prove to be stronger in population I Miras, whereas H em line is definitely stronger in population II stars. The coefficient of correlation between residual line or band intensity and the partial statistical population index, depending principally on the star distance to the galactic plane, grows with increasing mass number of the corresponding element. 相似文献
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Large mysticete whales represent a unique challenge for chemical risk assessment. Few epidemiological investigations are possible due to the low incidence of adult stranding events. Similarly their often extreme life-history adaptations of prolonged migration and fasting challenge exposure assumptions. Molecular biomarkers offer the potential to complement information yielded through tissue chemical analysis, as well as providing evidence of a molecular response to chemical exposure. In this study we confirm the presence of cytochrome P450 reductase (CPR) and cytochrome P450 isoenzyme 1A1 (CYP1A1) in epidermal tissue of southern hemisphere humpback whales (Megaptera novaeangliae). The detection of CYP1A1 in the integument of the humpback whale affords the opportunity for further quantitative non-destructive investigations of enzyme activity as a function of chemical stress. 相似文献
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