http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effects of Electric Field on Raman Spectra in SrTi16O3 and SrTi18O3
Kohji Abe,Mitsuru Itoh,Osamu Sanaka,Ruiping Wang,Takashi Akaike,Takeshi Shigenari,Tomohiko Takemoto 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Proton ordering phase transition of ice crystal was studied by Raman pectroscopy. The difference of the vibrational modes between Ih and XI phase were detected for the rst time in the translation region and in the libration region. Below Tc(= 72K), in the translation region a new intense peak was observed at 236 cm1 and the peak at 315 cm1 in Ih phase shifted to 325 cm1. In the libration region several new peaks were observed. Assignments of these modes are discussed from the polarization dependence.
Dielectric and Fluorescence Study on Phase Transitions in Liquid Crystal 5CB and 8CB
Kohji Abe,Atsushi Usami,Kenji Ishida,Takeshi Shigenalri,Yoshiharu Fukushima 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Successive phase transitions, isotropic(I)-nematic(N)-crystal(C) of 5CB (pentyl cyanobiphenyl) and I-N-smectic(Sm)-C of 8CB (octyl cyanobiphenyl) were studied by dielectric measurement and time-resolved uorescence spectroscopy. Dielectric constants in 5CB and 8CB are very similar and show a considerable change at the I-N transition and an abrupt decrease at the crystallization point. In uorescence spectra, a broad and intense band from excimers (dimers in the excited state) and a weak band from monomers are observed at around at 405 nm and 350 nm, respectively. The temperature dependence of uorescence spectra and lifetime show a gradual change before the melting point as a precursor of the rst-order transition, while only little change was observed at the N-I transition
Raman Spectra of Proton Ordered XI phase Ice crystal
Kohji Abe,Kohji Nakano,Takao Miasa,Yuya Ohtake 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Eects of an external electric feld on Raman spectra were studied in oxygen-isotope-substitutedSrTi18O3 (STO18). Signifcant frequency shifts and an increase of the intensities were observed above and below the ferroelectric transition temperature Tc = 23 K. Despite the clear difference in normal Raman spectra at low temperatures, the effect of an electric feld on the ferroelectric soft mode is similar to that for STO16, suggesting that in STO18 the soft mode remains very sensitive to the electric feld.
Shuichi Hiroyama,Keiko Matsunaga,Miwa Ito,Hitoshi Iimori,Ippei Morita,Jun Nakamura,Eku Shimosegawa,Kohji Abe 대한핵의학회 2023 핵의학 분자영상 Vol.57 No.4
Purpose Integrin αv is a key regulator in the pathophysiology of hepatic fibrosis. In this study, we evaluated the potentialutility of an integrin αvβ3 positron emission tomography (PET) radiotracer, 18F-labeled cyclic arginine-glycine-aspartic acidpenta-peptide ([18F]F-FPP-RGD2), for detecting hepatic integrin αv and function in nonalcoholic steatohepatitis (NASH)model rats using integrin αv siRNA. Methods NASH model rats were produced by feeding a choline-deficient, low-methionine, high-fat diet for 8 weeks. PET/computerized tomography imaging and quantification of integrin αv protein, serum aspartate aminotransferase, and alanineaminotransferase were performed 1 week after single intravenous injection of integrin αv siRNA. Results Integrin αv siRNA (0.1 and 0.5 mg/kg) dose-dependently decreased hepatic integrin αv protein concentrations incontrol and NASH model rats. The hepatic mean standard uptake value of [18F]F-FPP-RGD2 was decreased dose-dependentlyby integrin αv siRNA. The mean standard uptake value was positively correlated with integrin αv protein levels in controland NASH model rats. Serum aspartate aminotransferase and alanine aminotransferase concentrations were also decreasedby siRNA injection and correlated with liver integrin αv protein expression levels in NASH model rats. Conclusion This study suggests that [18F]F-FPP-RGD2 PET imaging is a promising radiotracer for monitoring hepatic integrinαv protein levels and hepatic function in NASH pathology.