The effect of myocardium being subjected to 60 min ischemia and 60 min reperfusion incat cardiopulmonary bypass on level of lipid peroxides(LPO),function of myocardial mitochon-dria and activity of superoxides dismuta...The effect of myocardium being subjected to 60 min ischemia and 60 min reperfusion incat cardiopulmonary bypass on level of lipid peroxides(LPO),function of myocardial mitochon-dria and activity of superoxides dismutase(SOD)was studied. Myocardial mitochondrial functionwas depressed slightly 60 rain after ischemia but significantly 60 min after reperfusion.Increasedlipid peroxides content and decreased activity of SOD were observed at 60 rain after ischemia.Af-ter reperfusion,the activity of SOD continued decreasing,and LPO elevated still further.Theseresults support the hypothesis that free radicals may contribute to myocardial reperfusion injury.展开更多
The effect of alkali metal superoxides M_3O（M = Li,Na,K） on the electronic and optical properties of a Be_（12）O_（12） nanocage was studied by density functional theory（DFT） and time-dependent density functional...The effect of alkali metal superoxides M_3O（M = Li,Na,K） on the electronic and optical properties of a Be_（12）O_（12） nanocage was studied by density functional theory（DFT） and time-dependent density functional theory（TD-DFT）.The energy gaps（Eg） of all configurations were calculated.Generally,the adsorption of alkali metal superoxides on the Be_（12）O_（12） nanocage causes a decrease of Eg.Electric dipole moment μ,polarizability α,and static first hyperpolarizability β were calculated and it was shown that the adsorption of alkali metal superoxides on Be_（12）O_（12） increases its polarizability.It was found that the absorption of M_3 O on Be_（12）O_（12） nanocluster improves its nonlinear optical properties.The highest first hyperpolarizability（β≈ 214000 a.u.） is obtained in the K_3O–Be_（12）O_（12）nanocluster.The TD-DFT calculations were performed to investigate the origin of the first hyperpolarizabilities and it was shown that a higher first hyperpolarizability belongs to the structure that has a lower transition energy.展开更多
文摘The effect of myocardium being subjected to 60 min ischemia and 60 min reperfusion incat cardiopulmonary bypass on level of lipid peroxides(LPO),function of myocardial mitochon-dria and activity of superoxides dismutase(SOD)was studied. Myocardial mitochondrial functionwas depressed slightly 60 rain after ischemia but significantly 60 min after reperfusion.Increasedlipid peroxides content and decreased activity of SOD were observed at 60 rain after ischemia.Af-ter reperfusion,the activity of SOD continued decreasing,and LPO elevated still further.Theseresults support the hypothesis that free radicals may contribute to myocardial reperfusion injury.
文摘The effect of alkali metal superoxides M_3O（M = Li,Na,K） on the electronic and optical properties of a Be_（12）O_（12） nanocage was studied by density functional theory（DFT） and time-dependent density functional theory（TD-DFT）.The energy gaps（Eg） of all configurations were calculated.Generally,the adsorption of alkali metal superoxides on the Be_（12）O_（12） nanocage causes a decrease of Eg.Electric dipole moment μ,polarizability α,and static first hyperpolarizability β were calculated and it was shown that the adsorption of alkali metal superoxides on Be_（12）O_（12） increases its polarizability.It was found that the absorption of M_3 O on Be_（12）O_（12） nanocluster improves its nonlinear optical properties.The highest first hyperpolarizability（β≈ 214000 a.u.） is obtained in the K_3O–Be_（12）O_（12）nanocluster.The TD-DFT calculations were performed to investigate the origin of the first hyperpolarizabilities and it was shown that a higher first hyperpolarizability belongs to the structure that has a lower transition energy.
