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Cu2+和铜锌超氧化物歧化酶作用的光谱学研究 总被引:2,自引:0,他引:2
利用邻苯三酚自氧化法监测在磷酸盐缓冲体系中Cu2+对猪肝铜锌超氧化物歧化酶(CuZnSOD)活力的影响, 认为Cu2+与猪肝CuZnSOD存在直接相互作用. 通过荧光光谱方法研究了这种相互作用, 内源荧光的猝灭实验表明Cu2+与CuZnSOD形成1∶1型稳定配合物; 荧光猝灭的动力学分析表明配合物形成过程由两个独立步骤完成: 第一步是双分子快速缔合过程, 形成了结合疏松的配合物, 第二步是单分子慢速过程, 即松散的配合物“异构化”成为结合紧密的配合物. FTIR和CD证实相互作用过程伴随了蛋白分子构象的变化. 相似文献
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薄荷卷烟中香味成分的全二维气相色谱/飞行时间质谱分析 总被引:2,自引:0,他引:2
采用全二维气相色谱/飞行时间质谱法(GC×GC/TOFMS),以较长的非极性柱DB-5MS(30m×0.25mm×0.25μm)作为第一维柱,较短的中等极性柱DB-17MS(2m×0.1mm×0.1μm)作为第二维柱,利用固相微萃取法作为香味成分的萃取方法,对薄荷型ESSE卷烟的核心香味成分进行了定性分析,TOFMS谱图库检索结合全二维特有的包含结构信息的二维谱图,通过族分离和结构谱图鉴定,共鉴定了187种挥发性成分,其中对香气有贡献的成分118种. 相似文献
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This paper studies the influence of the reagent vibration
on the reaction O(1D)+HF → HO+F by using a quasi-classical
trajectory method on the new \textitab initio 1A' ground
singlet potential energy surface (Gómez-Carrasco et al
2007 Chem. Phys. Lett. 435 188--193). The product
angular distributions which reflect the vector correlation are
calculated. Four polarization-dependent differential cross sections
(PDDCSs) which are sensitive to many photoinitiated bimolecular
reaction experiments are presented in the center of the mass frame,
respectively. The differential cross section indicates that the OH
product mainly tends to the forward scattering, and other PDDCSs are
also influenced by the vibration levels of HF. 相似文献
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Time-dependent theoretical approach to the influence of laser fields on the resonance enhanced multi-photon ionization of SH radical 下载免费PDF全文
This paper reports that the (2+1) resonance enhanced multi-photon
ionization spectra of SH radical in external fields are simulated
using the split-operator scheme of time-dependent wave-packet
method. Two ionic states, i.e.~a1Δ and b1∑+, are
involved in the simulation. It gives the simulated photoelectron
spectra, the population in each electronic state, as well as the
projection of the wave-packet in each electronic state on different
vibrational states. These results show that the so-called four-state
model can represent the experimental results well. 相似文献
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