Monometalloporphyrin and p-oxo-bismetalloporphyrin compounds of metal iron,manganese and cobalt were synthesized, and used as the model compounds of cytochrome P-450 monooxygenase in catalytic oxidation of cyclohexane...Monometalloporphyrin and p-oxo-bismetalloporphyrin compounds of metal iron,manganese and cobalt were synthesized, and used as the model compounds of cytochrome P-450 monooxygenase in catalytic oxidation of cyclohexane with iodosobenzene. The influence of the addition of magnetic field on the catalytic properties of these metalloporphyrins was in-spected. The studies reveal that the influence of the addition of magnetic field on the catalyt-ic behavior of other metalloporphyrins does not go beyond 37% except monoironporphyrin.But the addition of magnetic field makes the reaction yield of cyclohexane oxidation catalyzed by monoironporphyrin be increased to 53%, and makes the rate of reaction be twice as much. This fact means that the catalytic processes of cytochrome P-450 monooxygenase in human bodies may be bound up with earth magnetic field closely. This discovery has singular meaning to unlock the mystery of biosphere consisting of human and earth.展开更多
为了对不同塔型下1 000 k V特高压交流输电线路对人体的磁场效应进行安全评估,应用有限元软件COMSOL分别对典型的酒杯塔线路和猫头塔线路下方人体模型的磁场效应进行了仿真计算,比较分析了不同塔型下人体的磁感应强度、感应电场强度和...为了对不同塔型下1 000 k V特高压交流输电线路对人体的磁场效应进行安全评估,应用有限元软件COMSOL分别对典型的酒杯塔线路和猫头塔线路下方人体模型的磁场效应进行了仿真计算,比较分析了不同塔型下人体的磁感应强度、感应电场强度和感应电流密度的大小及分布情况,并与国际非电离辐射防护委员会(International Commission on Non-Ionizing Radiation Protection,ICNIRP)规定的人体电磁暴露限值做了比较。结果表明:磁场在人体及其周围的分布是均匀的,磁感应强度在横向空间的等位分布为圆弧形;酒杯塔线路的磁感应强度、感应电场强度和感应电流密度在人体的分布规律与猫头塔线路相似。酒杯塔线路下人体各感应值的最大值分别约为猫头塔的56.3%、54.6%和55.2%;与ICNIRP规定的人体电磁暴露限值比较,所有计算结果均处于限值以内的较低水平。酒杯塔和猫头塔线路产生的电磁暴露均不会对人体健康造成威胁。从电磁暴露剂量学的角度考虑,酒杯塔线路要优于猫头塔线路。展开更多
The influences of magnetic fields on the biocatalytic properties of Schiff base mono- and dinuclear complexes for the monooxygenation of cyclohexane by PhIO were studied. It was found that the catalytic activities of ...The influences of magnetic fields on the biocatalytic properties of Schiff base mono- and dinuclear complexes for the monooxygenation of cyclohexane by PhIO were studied. It was found that the catalytic activities of these catalysts increase with the increase of the outside magnetic field intensity used, and the effects of magnetic field on the catalytic properties of these dinuclear complexes generally increase with the increase of the number of unpaired d electrons of the metal ion and the magnetic exchange between the two metals in these dinuclear complexes. Furthermore, it was found that the effect of magnetic field on the iron complex was greater than that on the other metallic complexes, and the effect of magnetic field on the mononuclear complex was greater than that on the dinuclear complex.展开更多
Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can...Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can produce a significant effect on the photodetachment of negative ion near a metal surface. Besides the closed orbits previously found by Duet al. for the H in the electric field near a metal surface （J. Phys. B 43 035002 （2010））, some additional closed orbits are produced due to the effect of magnetic field. For a given ion surface distance and an electric field strength, the cross section depends sensitively on the magnetic field strength. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces.展开更多
文摘Monometalloporphyrin and p-oxo-bismetalloporphyrin compounds of metal iron,manganese and cobalt were synthesized, and used as the model compounds of cytochrome P-450 monooxygenase in catalytic oxidation of cyclohexane with iodosobenzene. The influence of the addition of magnetic field on the catalytic properties of these metalloporphyrins was in-spected. The studies reveal that the influence of the addition of magnetic field on the catalyt-ic behavior of other metalloporphyrins does not go beyond 37% except monoironporphyrin.But the addition of magnetic field makes the reaction yield of cyclohexane oxidation catalyzed by monoironporphyrin be increased to 53%, and makes the rate of reaction be twice as much. This fact means that the catalytic processes of cytochrome P-450 monooxygenase in human bodies may be bound up with earth magnetic field closely. This discovery has singular meaning to unlock the mystery of biosphere consisting of human and earth.
文摘为了对不同塔型下1 000 k V特高压交流输电线路对人体的磁场效应进行安全评估,应用有限元软件COMSOL分别对典型的酒杯塔线路和猫头塔线路下方人体模型的磁场效应进行了仿真计算,比较分析了不同塔型下人体的磁感应强度、感应电场强度和感应电流密度的大小及分布情况,并与国际非电离辐射防护委员会(International Commission on Non-Ionizing Radiation Protection,ICNIRP)规定的人体电磁暴露限值做了比较。结果表明:磁场在人体及其周围的分布是均匀的,磁感应强度在横向空间的等位分布为圆弧形;酒杯塔线路的磁感应强度、感应电场强度和感应电流密度在人体的分布规律与猫头塔线路相似。酒杯塔线路下人体各感应值的最大值分别约为猫头塔的56.3%、54.6%和55.2%;与ICNIRP规定的人体电磁暴露限值比较,所有计算结果均处于限值以内的较低水平。酒杯塔和猫头塔线路产生的电磁暴露均不会对人体健康造成威胁。从电磁暴露剂量学的角度考虑,酒杯塔线路要优于猫头塔线路。
文摘The influences of magnetic fields on the biocatalytic properties of Schiff base mono- and dinuclear complexes for the monooxygenation of cyclohexane by PhIO were studied. It was found that the catalytic activities of these catalysts increase with the increase of the outside magnetic field intensity used, and the effects of magnetic field on the catalytic properties of these dinuclear complexes generally increase with the increase of the number of unpaired d electrons of the metal ion and the magnetic exchange between the two metals in these dinuclear complexes. Furthermore, it was found that the effect of magnetic field on the iron complex was greater than that on the other metallic complexes, and the effect of magnetic field on the mononuclear complex was greater than that on the dinuclear complex.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11074104 and 10604045)the University Science and Technology Planning Program of Shandong Province of China (Grant No. J09LA02)
文摘Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can produce a significant effect on the photodetachment of negative ion near a metal surface. Besides the closed orbits previously found by Duet al. for the H in the electric field near a metal surface （J. Phys. B 43 035002 （2010））, some additional closed orbits are produced due to the effect of magnetic field. For a given ion surface distance and an electric field strength, the cross section depends sensitively on the magnetic field strength. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces.
