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AKIO NAKAJIMA 《高分子科学》1989,(3):193-201
This paper surveys the author's, investigations on block-, random-, and oligo-polyaminoacids as materials with potential towards their biomedical applications. Theoretical considerations are made on the formation of novel microheterophase structures as revealed by peptide-elastomer-peptide type block copolymers, and their mechanical and dynamic mechanical behaviors of the mem- 相似文献
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NORIO MIYOSHI HARUO HISAZUMI OSAMU UEKI KAZUYOSHI NAKAJIMA 《Photochemistry and photobiology》1984,39(3):359-363
Abstract— The fluorescence lifetime and degree of fluorescence polarization of hematoporphyrin derivative (HpD) have been investigated using different solutions: organic and micellar solutions. Ham's F12 medium, and KK-47 cell suspension. The lifetime and polarization degree in organic and micellar solutions did not change with increasing incubation time, but the polarization degree in the cell suspensions temporarily increased at the initial incubation time and then decreased 4 h after incubation. The lifetime in the cell suspensions exhibited a bi-phasic exponential decay. The results obtained suggested that mainly dimeric HpD may bind weakly to the cell membrane, and then slowly be distributed throughout the cytoplasm. The polarity and viscosity of the intracellular loci containing HpD were evaluated from the fluorescence polarizations of HpD in MeOH-H2 O mixtures and ethylene glycol(EG)-MeOH mixtures. The dielectric constant and viscosity of the loci containing HpD were 35 and 11 cp, respectively. Accordingly, the intracellular location of HpD were considered relatively hydrophilic loci of the cells. 相似文献
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Kazuhisa NAKAJIMA 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2015,91(6):223-245
To date active research on laser-driven plasma-based accelerators have achieved great progress on production of high-energy, high-quality electron and photon beams in a compact scale. Such laser plasma accelerators have been envisaged bringing a wide range of applications in basic, medical and industrial sciences. Here inheriting the groundbreaker’s review article on “Laser Acceleration and its future” [Toshiki Tajima, (2010)],1) we would like to review recent progress of producing such electron beams due to relativistic laser-plasma interactions followed by laser wakefield acceleration and lead to the scaling formulas that are useful to design laser plasma accelerators with controllability of beam energy and charge. Lastly specific examples of such laser-driven electron/photon beam sources are illustrated. 相似文献
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Calculations have been performed on the transition metal hydroxides CuOH, AgOH, and AuOH using SCF and the coupled-cluster with singles, doubles, and perturbative triples (CCSD(T)) methods. The relativistic effect was included in the third-order Douglas—Kroll approximation. Equilibrium geometries, dissociation energies, vibrational frequencies, and dipole moments are reported for the ground state of each species. The relativistic stability of the valence s orbital weakens the ionic character and strengthens the covalent character of the metal—OH bond. For CuOH and AgOH the calculated results show good agreement with available experiment. The anomalous behaviour of AuOH is discussed from the relativistic point of view. 相似文献
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在采用固相反应法成功制备单相Na0.75Co1-xRuxO2(0≤x≤0.5)样品的基础上,对其结构、输运性质和磁性质进行了系统研究.结果表明,x≤0.5的样品仍保持单相。样品的晶格参数随着Ru替代浓度x值的增加逐渐增大,说明在该体系中,Ru能均匀地替代Co.对于x=0的样品,在整个测量温区内,其电阻率-温度关系呈现典型的金属行为;x=0.01样品在T=37K附近发生了金属-绝缘体相变;而x≥0.02的所有样品,整个测量温区内均为半导体.与x=0样品相比较.x=0.1样品在30K时的电阻率增大了5个数量级.我们认为该体系在x=0.01附近发生的金属-绝缘体(MI)相变,起源于CoO2层的无序导致的电子的Anderson局域化.对于所有样品,在2K以上均没有观测到长程磁有序。其磁化率在100K以上均满足居里-外斯定律,同时对该体系的磁化率结果进行了详细讨论. 相似文献