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BOŽENA SKLÁRŠOVÁ PETER ŠIMON EMIL KOLEK PETER ŠIMKO ALENA BEDNÁRIKOVÁ 《Polycyclic Aromatic Compounds》2013,33(4):580-588
Benzo[a]pyrene (BaP) was dissolved in glyceryl trioctanoate, heated in a glass reaction vessel within temperature range 297.95–361.85 K with heating rate of 1 K/min and simultaneously exposed to UV light at wavelength λ = 365 nm at radiation power 20 mW cm?2 in order to study the decrease of BaP concentration due to its photooxidation. The concentration of BaP was determined by HPLC-FD periodically in 5 min intervals. As observed, the BaP concentration decreased from 62.2 μg L-1 to 19.8 μg L-1. From the experimental results, the parameters characterizing the non-isothermal kinetics of BaP photooxidation have been obtained. The parameters were tested at two various isothermal conditions (290.16 and 323.26 K) to verify a suitability of derived parameters. Comparing calculated and measured data of half-lives of BaP decrease at mentioned temperatures it was found that calculated half-lives are in a good accordance with those experimentally obtained values, when relative standard deviations at 290.16 K were 17.0% and 5.4% at 323.26 K, respectively. The kinetic parameters enable the calculation of the rate constant for any temperature in isothermal regime and make possible to model, in general, the kinetics of such processes without a deeper insight into their mechanisms. 相似文献
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Endaural reflex diagnosis of cochleovestibular dysfunctions in patients with vascular brain diseases
OV Troshin 《Canadian Metallurgical Quarterly》1996,96(5):59-63
Results obtained prove that respiration stimulation of mitochondria Ca2+, Sr2+, Mn2+ is determined by transport of these cations to the indicated subcellular structures with participation of Ca2(+)-uniporter. Effect of Cd2+ on respiration of mitochondria is of two-phase character. Concentration of Cd2+ being above 100 microM the stimulation phase is accompanied by the further inhibition of mitochondria respiration. La3+ inhibits respiration of mitochondria. However La3+ and Cd2+ stimulate H+ production by mitochondria, that is not blocked by ruthenium red (10 microM). Probably, the effect of La3+ and Cd2+ on respiration of mitochondria is determined by the change of proton conductivity of mitochondrion membrane. Direct inhibiting effect of Cd2+ on the respiration chain of mitochondria has been established. 相似文献