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21.
Pavel Svoboda Pavel Javorský Fuminori Honda Vladimír Sechovský Alois A. Menovsky 《Central European Journal of Physics》2004,2(2):397-418
The tetragonal compound UNi2Si2 exhibits in zero magnetic field three different antiferromagnetic phases belowT
N
=124 K. They are formed by ferromagnetic basal planes, which are antiferromagnetically coupled along thec-axis with the propagation vectorq=(0, 0, q
z
). Two additional order-order magnetic phase transitions are observed below T
N
, namely atT
1=108 K and T
2=40 K in zero magnetic field. All three phases exhibit strong uniaxial anisotropy confining the U moments to a direction parallel
to the c-axis. UNi2Si2 single crystals were studied in detail by measuring bulk thermodynamic properties, such as thermal expansion, resistivity,
susceptibility, and specific heat. A microscopic study using neutron diffraction was performed in magnetic fields up to 14.5
T parallel to the c-axis, and a complex magnetic phase diagram has been determined. Here, we present the analysis of specific-heat data measured
in magnetic fields up to 14 T compared with the results of the neutron-diffraction study and with other thermodynamic properties
of UNi2Si2. 相似文献
22.
K. Fuke K. Tsukamoto F. Misaizu 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,26(Z1):204-206
Photoionization thresholds of Si
n
(n=2–40) were examined by vacuum UV radiation (5.7–8.5 eV) generated by stimulated Raman scattering of narrow-bandwidth 193-nm radiation in high pressure hydrogen and deuterium gases. A strong threshold energy dependence on cluster size is observed, featuring major maxima at 10 and 20. The magic behavior atn=10 is consistent with the results of the photofragmentation and CID experiments reported previously. 相似文献
23.
24.
Yasunao Inoue Tomoki Omodani Ryotaro Shiratake Fuminori Sato 《Tetrahedron: Asymmetry》2010,21(15):1855-1860
We have successfully synthesized chiral β-amino trifluoromethyl alcohol (2S,3S)-7a, which is a key intermediate in the production of AE-3763, by stereoselective reduction of N-Cbz-protected 5-hydroxy-5-(trifluoromethyl)-1,3-oxazolidine 4 prepared from L-valine in 3 steps followed by alkaline hydrolysis. This new method can be applied to the industrial-scale synthesis of AE-3763. 相似文献
25.
A novel flow-coulometric detector integrating an immobilized uricase reactor and an electrolytic cell was fabricated and used for the determination of uric acid in human urine. The procedure is based on the measurement of the total charge with and without passing the sample through an enzyme reactor which allows the complete conversion of the electro-active uric acid in electro-inactive products. The amount of uric acid is linearly related to the difference between the two total charges. The current efficiencies for 1 × 10?4-1 × 10?3 M uric acid were found to be nearly 100% (r.s.d. < 1%). 相似文献
26.
Makino K Nakajima T Shikamura M Ito F Ando S Kochi C Inagawa H Soma G Terada H 《Colloids and surfaces. B, Biointerfaces》2004,36(1):35-42
Monodispersed PLGA microspheres containing rifampicin (RFP) have been prepared by solvent evaporation method using a Shirasu porous glass (SPG) membrane. The microspheres were spherical and their average diameter was about 2 microm. The loading efficiency of rifampicin was dependent on the molecular weight of PLGA. The higher loading efficiency was obtained by the usage of PLGA with the lower molecular weight, which may be caused by the interaction of the amino groups of rifampicin with the terminal carboxyl groups of PLGA. PLGA with the monomer compositions of 50/50 and 75/25, of lactic acid/glycolic acid, were used in this study. From rifampicin-loaded PLGA microspheres formulated using PLGA with the molecular weight of 20,000, rifampicin was released with almost constant rate for 20 days after the lag phase was observed for the initial 7 days at pH 7.4. On the other hand, from rifampicin-loaded PLGA microspheres formulated using PLGA with the molecular weight of 5000 or 10,000, almost 90% of rifampicin-loaded in the microspheres was released in the initial 10 days. Highly effective delivery of rifampicin to alveolar macrophages was observed by the usage of rifampicin-loaded PLGA microspheres. Almost 19 times higher concentration of rifampicin was found to be incorporated in alveolar macrophages when rifampicin-loaded PLGA microspheres were added to the cell culture medium than when rifampicin solution was added. 相似文献
27.
Tatsuya Nakamura Dr. Hisashi Matsushita Dr. Fuminori Sugihara Prof. Yoshichika Yoshioka Dr. Shin Mizukami Prof. Kazuya Kikuchi 《Angewandte Chemie (International ed. in English)》2015,54(3):1007-1010
19F magnetic resonance imaging (MRI) probes that can detect biological phenomena such as cell dynamics, ion concentrations, and enzymatic activity have attracted significant attention. Although perfluorocarbon (PFC) encapsulated nanoparticles are of interest in molecular imaging owing to their high sensitivity, activatable PFC nanoparticles have not been developed. In this study, we showed for the first time that the paramagnetic relaxation enhancement (PRE) effect can efficiently decrease the 19F NMR/MRI signals of PFCs in silica nanoparticles. On the basis of the PRE effect, we developed a reduction‐responsive PFC‐encapsulated nanoparticle probe, FLAME‐SS‐Gd3+ (FSG). This is the first example of an activatable PFC‐encapsulated nanoparticle that can be used for in vivo imaging. Calculations revealed that the ratio of fluorine atoms to Gd3+ complexes per nanoparticle was more than approximately 5.0×102, resulting in the high signal augmentation. 相似文献
28.
Fuminori Tasaka 《Journal of Algebra》2008,319(6):2451-2470
We show that under some conditions the character correspondence introduced by Dade which partly generalizes the Glauberman correspondence induces isotypy between blocks of finite groups. 相似文献
29.
30.
Multifunctional Core–Shell Silica Nanoparticles for Highly Sensitive 19F Magnetic Resonance Imaging 下载免费PDF全文
Hisashi Matsushita Dr. Shin Mizukami Dr. Fuminori Sugihara Yosuke Nakanishi Prof. Yoshichika Yoshioka Prof. Kazuya Kikuchi 《Angewandte Chemie (International ed. in English)》2014,53(4):1008-1011
19F magnetic resonance imaging (19F MRI) is useful for monitoring particular signals from biological samples, cells, and target tissues, because background signals are missing in animal bodies. Therefore, highly sensitive 19F MRI contrast agents are in great demand for their practical applications. However, we have faced the following challenges: 1) increasing the number of fluorine atoms decreases the solubility of the molecular probes, and 2) the restriction of the molecular mobility attenuates the 19F MRI signals. Herein, we developed novel multifunctional core–shell nanoparticles to solve these issues. They are composed of a core micelle filled with liquid perfluorocarbon and a robust silica shell. These core–shell nanoparticles have superior properties such as high sensitivity, modifiability of the surface, biocompatibility, and sufficient in vivo stability. By the adequate surface modifications, gene expression in living cells and tumor tissue in living mice were successfully detected by 19F MRI. 相似文献