Demonstration of enzymatic activity converting azathioprine to 6-mercaptopurine

The enzymatic conversion of azathioprine to 6-mercaptopurine was detected at pH 6.5 with rat liver supernatants, although the non-enzymatic reaction predominated at pH 7.0 and 7.5. Glutathione S-transferase may catalize this conversion. Activities of the enzyme in liver with both zathioprine and 1,2-dichloro-4-nitrobenzene as substrate decreased upon carbon tetrachloride-induced hepatic injury. These results may explain an ineffectiveness of azathioprine in patients with severe hepatic damage.</p

Ettingshausen and Nernst effects in mixed state of YBa_2Cu_3O_<7-δ>(High Field Superconductors)

The dissipative behaviors under the Lorentz force and the thermal force are investigated for the same sample of QMG-YBa_2Cu_3O_ by measuring the Ettingshausen and the Nernst effects, respectively, and compared with each other. The value of S_φ(T) obtained from the Nernst effect is found to be smaller than that obtained from the Ettingshausen effect, which suggests that the viscosity is not the same for the vortex motions under the Lorentz force and the thermal force. The QMG-YBa_2Cu_3O_ always includes precipitates of Y_2BaCuO_5 phase which are finely dispersed by an addition of Pt. In order to investigate the effect of Y_2BaCuO_5 phase on the vortex motion, the Ettingshausen effect is also measured for the sample with 0.5 mass% Pt addition. The anisotropy of the dissipation under the thermal force is investigated by measuring the Nernst effect for the configurations; (1) H//c, (dT/dx)//ab, (2) H//ab, (dT/dr)//ab and (3) H//ab, (dT/dr)//c. For these vortex motions, viscosities are found to be in the ratio 30 : 1 : 100. The velocity of vortices is estimated from the Nernst field. Furthermore, using S_φ(T) the magnitude of viscosity is estimated to be 0.5-3×10^ N s/m^2 in the temperature range from 90 to 75 K and the magnetic field of 13 T parallel to the c-axis

Observation of Hilbert differential image by x-ray microscope andits application to phase tomography

科学研究費助成事業(科学研究費補助金)研究成果報告書：基盤研究（C）2010-2012課題番号：2261100

Pseudogap Phase Boundary in Overdoped Bi_2Sr_2CaCu_2O_8 Studied by Measuring Out-of-plane Resistivity under the Magnetic Fields

The characteristic pseudogap temperature T* in Bi2Sr2CaCu2O8 system has been systematically evaluated as a function of doping, especially focusing on its overdoped region, by measuring the out-of-plane resistivity under the magnetic fields. Overdoped samples have been prepared by annealing TSFZ-grown Bi2Sr2CaCu2O8 single crystals under the high oxygen pressures (990 kgf/cm2). At a zero field, the out-of-plane resistivity showed a metallic behavior down to Tc (= 62 K), while under the magnetic fields of over 3 T,it showed typical upturn behavior from around 65 K upon decreasing temperature. This result suggests that the pseudogap and superconductivity are different phenomena.Comment: 2 pages, 2 figures. Final version accepted for the Proceedings of the M2S-IX Conference (Tokyo, September 2009

Eigenvalue analysis of three-state quantum walks with general coin matrices

Mathematical analysis on the existence of eigenvalues is vital, as it corresponds to the occurrence of localization, an exceptionally important property of quantum walks. Previous studies have demonstrated that eigenvalue analysis utilizing the transfer matrix proves beneficial for space inhomogeneous three-state quantum walks with a specific class of coin matrices, including Grover matrices. In this research, we turn our attention to the transfer matrix of three-state quantum walks with a general coin matrix. Building upon previous research methodologies, we dive deeper into investigating the properties of the transfer matrix and employ numerical analysis to derive eigenvalues for models that were previously unanalyzable

Decreased Disappearance Rate of 1-(2-Tetrahydrofuryl)-5-Fluorouracil (FT-207) from the Blood and its Unresponsiveness to Tocopheryl Nicotinate and Indomethacin in Patients with Primary Hepatocellular Carcinoma

The disappearance rates(K) of FT-207 from the blood in patients with primary hepatoma and advanced cirrhosis of the liver were significantly lower than those in control patients with cancer but normal liver function. Pretreatment with tocopheryl nicotinate and indomethacin increased the K values in the control subjects, but was without effect on the K values in patients with primary hepatoma.</p