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71.
J. Mukai A. Odahara R. Nakatani Y. Haruta H. Tomura B. J. Min K. Heiguchi S. Suematsu S. Mitarai T. Kuroyanagi 《Zeitschrift für Physik A Hadrons and Nuclei》1992,342(4):393-396
The neutron deficient isotope79Y has been firstly identified and the decay properties were studied from-decay measurements in the reaction of54Fe(28Si,p2n at 92 MeV. Three rays of 152.5, 177.4, and 1106 keV were observed concerning the decay. The half life and QEC value were determined to be 14.9 ± 0.6 s and 7.12 ± 0.45 MeV, respectively. The decay scheme including spin-parity is discussed, and 5/2+ assignment for the ground state is proposed.We would like to thank to Dr. Y. Maeda for his valuable advice about the electroplating method of iron targets. We also thank to Mr. T. Maeda and Mr. S. Niiya for preparation of hardware for data-taking. 相似文献
72.
73.
Kiyose K Hanaoka K Oushiki D Nakamura T Kajimura M Suematsu M Nishimatsu H Yamane T Terai T Hirata Y Nagano T 《Journal of the American Chemical Society》2010,132(45):15846-15848
Based on the findings that the azo functional group has excellent properties as the hypoxia-sensor moiety, we developed hypoxia-sensitive near-infrared fluorescent probes in which a large fluorescence increase is triggered by the cleavage of an azo bond. The probes were used for fluorescence imaging of hypoxic cells and real-time monitoring of ischemia in the liver and kidney of live mice. 相似文献
74.
Akahoshi N Ishizaki I Naya M Maekawa T Yamazoe S Horiuchi T Kajimura M Ohashi Y Suematsu M Ishii I 《Analytical and bioanalytical chemistry》2012,402(5):1859-1864
In vivo imaging of reactive small molecule metabolites with high spatial resolution and specificity could give clues to understanding
pathophysiology of various diseases. We herein applied time of flight-secondary ion mass spectrometry (TOF-SIMS) to newly
developed silver-deposited plates that were stamped on mouse tissues, and succeeded in visualization of halide (Cl−, Br−, and I−) and pseudohalide thiocyanate (SCN−) anions, a class of substrates for neutrophils/eosinophil peroxidases to produce hypohalous acids (HOX/OX− mixture; X: (pseudo)halides), as well as hydrogen sulfide (H2S). Forty-micrometer frozen mouse kidney sections on cover glasses were attached to 37 °C preheated silver-deposited plates
and incubated at −10 °C for 1 h. After sputter cleaning to remove surface contaminants, the plates were analyzed by TOF-SIMS
to identify distribution of Br−, AgBr2−, I−, AgI2−, SCN−, as well as S2− and AgS− as products of tissue-derived H2S. Br−, AgBr2−, I−, and SCN− anions were mainly distributed in core regions including the inner medulla and inner stripe of the outer medulla (except
for I−), rather than outer regions such as the cortex and outer stripe of the outer medulla. AgI2− anion was spread over the whole kidney, although its levels were relatively low. In contrast, S2− and AgS− anions were mainly present in the outer regions. To our knowledge, this is the first imaging study to reveal the distribution
of (pseudo)halides and H2S in animal tissue sections. 相似文献
75.
The theory of gel point in real polymer solutions is examined with the empirical correlation between the reciprocal of the percolation threshold and the coordination number given by the percolation theory. Applying a larger value of the relative frequency of cyclization, an excellent agreement is obtained between the present theory and the percolation result. This suggest that while the ring distribution on lattices is similar to that in real systems, ring production is more frequent in the lattice model than in real systems. To confirm this conjecture, we derive the ring distribution function of the lattice model as a limiting case of d→∞, and show that the solution is in fact identical to the asymptotic formula of C→∞ in real systems except for the coefficient C, which has a maximum at d = 5, in support of the above conjecture. To examine the validity of the asymptotic solution for the lattice model, we apply it to the critical point problem of the percolation theory, showing that the solution works well in high dimensions greater than six. 相似文献
76.
Magnetic and Gas Sensing Property of Nanosized NiFe2O4 Powders Synthesized by Pulsed Wire Discharge 总被引:1,自引:0,他引:1
P. Y. Lee K. Ishizaka H. Suematsu W. Jiang K. Yatsui 《Journal of nanoparticle research》2006,8(1):29-35
Nickel ferrite (NiFe2O4) powders were synthesized by pulsed wire discharge method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses show that only nickel ferrite spinel and no other phase was observed in the powders. Mean size of the obtained particles strongly depended on the oxygen pressure: the higher oxygen pressure corresponds to larger powder size, as determined by Brunauer–Emmet–Teller (BET). The room temperature saturation magnetization of the synthesized powders was 42–46 emu/g depending on the powder size. These powders also showed high chlorine sensitivity at about 280–360°C, and a good linear sensitivity with chlorine concentration. 相似文献
77.
Ichinose M Suematsu H Yasutomi Y Nishioka Y Uchida T Katsuki T 《Angewandte Chemie (International ed. in English)》2011,50(42):9884-9887
'Salen' along: The iridium(III)-salen complex 1 efficiently catalyzes the title reaction of 2-ethylbenzenesulfonyl azides to give five-membered sultams with high enantioselectivity. Other 2-alkyl-substitued substrates lead to five- and six-membered sultams with high enantioselectivity; the regioselectivity depends upon the substrate and the catalyst used. EDG=electron-donating group. 相似文献
78.
Kubo A Ohmura M Wakui M Harada T Kajihara S Ogawa K Suemizu H Nakamura M Setou M Suematsu M 《Analytical and bioanalytical chemistry》2011,400(7):1895-1904
Analyses of energy metabolism in human cancer have been difficult because of rapid turnover of the metabolites and difficulties
in reducing time for collecting clinical samples under surgical procedures. Utilization of xenograft transplantation of human-derived
colon cancer HCT116 cells in spleens of superimmunodeficient NOD/SCID/IL-2Rγnull (NOG) mice led us to establish an experimental model of hepatic micrometastasis of the solid tumor, whereby analyses of the
tissue sections collected by snap-frozen procedures through newly developed microscopic imaging mass spectrometry (MIMS) revealed
distinct spatial distribution of a variety of metabolites. To perform intergroup comparison of the signal intensities of metabolites
among different tissue sections collected from mice in fed states, we combined matrix-assisted laser desorption/ionization
time-of-flight imaging mass spectrometry (MALDI–TOF-IMS) and capillary electrophoresis–mass spectrometry (CE–MS), to determine
the apparent contents of individual metabolites in serial tissue sections. The results indicated significant elevation of
ATP and energy charge in both metastases and the parenchyma of the tumor-bearing livers. To note were significant increases
in UDP-N-acetyl hexosamines, and reduced and oxidized forms of glutathione in the metastatic foci versus the liver parenchyma. These
findings thus provided a potentially important method for characterizing the properties of metabolic systems of human-derived
cancer and the host tissues in vivo. 相似文献
79.
We have performed ultrahigh-resolution angle-resolved photoemission spectroscopy on high-quality single crystals of graphite to elucidate the character of low-energy excitations. We found evidence for a well-defined quasiparticle (QP) peak in the close vicinity of the Fermi level comparable to the nodal QP in high-T(c) cuprates, together with the mass renormalization of the band at an extremely narrow momentum region around the K(H) point. Analysis of the QP lifetime demonstrates the presence of strong electron-phonon coupling and linear energy dependence of the QP scattering rate indicative of a marked deviation from the conventional Fermi-liquid theory. 相似文献
80.