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Photophysical and Photochemical Property of ATX-S10
Ito, Toshiaki,Okazaki, Shigetoshi,Kageyama, Kazumi,Hirohata, Toru,Kohno, Eiji,Hirano, Toru Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Photodynamic therapy (PDT) is a medical treatment using laser and photosensitizing drug taken up to destroy cancer cells. Singlet oxygen ($^1$0$_2$) generation is strongly related to this treatment. We have built a direct detection system monitoring feeble luminescence, in the near IR region, from $^1$0$_2$, We have comparatively studied the photophysical and photochemical properties in solution of a newly developed drug ATX-S10 and Photofrin already investigated clinically. We demonstrdted that ATX-S10 was capable of efficiently yielding $^1$0$_2$, which may lead to highly efficient PDT treatment. Successive laser excitation photobleached ATX -S10 readily in a dose-dependent manner. This result shows that ATX -S10 is useful in setting up suitable medical treatment conditions to minimize side effects.
Detection of 1270 nm Emission from Singlet Oxygen due to Photodynamic Therapy in vitro and in vivo.
Hirano, Toru,Kohno, Eiji,Ito, Toshiaki,Okazaki, Shigetoshi,Hirohata, Toru,Niigaki, Minoru,Kageyama, Kazumi,Miyaki, Sueo Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Photodynamic therapy (PDT) is a cancer treatment modality which utilizes the cytotoxicity of the active singlet oxygen derived from irradiation of a tumor accumulated photosensitizer. As the oxygen in the singlet state radiates an emission of 1270nm wavelength when it decays to the triplet state, detection of the emission helps us to understand the mechanism of PDT or to evaluate photosensitizers. We detected the 1270nm emission from photosensitizers Photofrin and ATX-SI0 in vitro and in vivo by means of high sensitive NIR detectors. We obtained the maximum amount of singlet oxygen at irradiation wavelength of 665-670nm from a HeLa tumor in a nude mouse which is injected with ATX-S10.
Ito, Kosuke,Takahashi, Toru,Fujino, Takayasu,Ishikawa, Motoo The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3
The present paper discusses experimental and numerical studies on the fluid behavior in a magnetohydrodynamic(MHD) micro pump for micro total analysis system(${\mu}$-TAS). In the experiment, the MHD micro pump has a length of 26.0 mm, a width and a height of 0.5 mm. As a working fluid, Phosphate Buffered Saline(PBS) solution is used under the assumption of blood analysis using ${\mu}$-TAS. A neodymium permanent magnet with the maximum magnetic flux density of 0.32 T is used for applying a magnetic field to a channel in the MHD pump. Experimental and numerical results show that Hartmann flow is not observed in the channel because the MHD interaction is very weak, so that Poiseuille flow is maintained in the channel. The numerical study also examines the influences of the channel height and the strength of externally applied magnetic flux density on the fluid temperature in the channel. The numerical results indicate that an increase in fluid temperature by operating the MHD pump is less than 1 K when the magnetic flux density and the channel height are more than 0.3 T and 0.3 mm, respectively.
Extremely-slow, half-number shockwave lithotripsy for asymptomatic renal stones <20 mm
Katsuhiro Ito,Toshifumi Takahashi,Toru Kanno,Takashi Okada,Yoshihito Higashi,Hitoshi Yamada 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.1
Purpose: To compare the treatment success rate and safety of reduced (30 shocks/min, 1,200 shocks/session) versus standard (60 shocks/min, 2,400 shocks/session) extracorporeal shockwave lithotripsy for the management of renal stones. Materials and Methods: We retrospectively analyzed 404 patients who underwent extracorporeal shockwave lithotripsy for 5–20-mm renal stones between April 2011 and March 2019. Patients selected the reduced or standard protocol (group R and S) after explaining the potential benefits and disadvantages. The primary outcome was treatment success within 12 weeks, which was defined as no residual fragment or fragments <4 mm on ultrasonography and plain radiograph. Results: In total, 94 and 310 patients underwent shockwave lithotripsy with a reduced and standard protocol, respectively. The background characteristics of the participants did not significantly differ. The treatment success within 12 weeks was achieved in 78 (83.0%) patients in group R and 259 (83.5%) in group S (p=0.88). The median number of the session was 3 (interquartile range, 2–4) in both groups (p=0.53). The total complication rates were 5.4% in group R and 6.1% in group S. Three (1.0%) patients in group S experienced perirenal hematoma, which was conservatively treated. The reduced protocol was not associated with treatment success in the multivariate analysis adjusted for potential confounders (odds ratio, 0.91; 95% confidence interval, 0.46–1.80; p=0.78). Conclusions: The new treatment amendment with a slower delivery rate successfully reduced the total number of shocks need to fragment renal stones <20 mm without compromising the stone-free rate.
Mogi, Toru,Kusunoki, Ken'ichirou,Kaieda, Hideshi,Ito, Hisatoshi,Jomori, Akira,Jomori, Nobuhide,Yuuki, Youichi Korean Society of Earth and Exploration Geophysici 2009 지구물리와 물리탐사 Vol.12 No.1
항공전자탐사기법은 대규모의 접근이 불가능한 지역에 대한 탐사가 가능하여 화산구조를 조사하는데 유용한 탐사기법이나, 낮은 정밀도와 제한된 가탐심도의 단점을 가지고 있다. 접지된 전기송신원을 이용한 시간영역 항공 전자탐사 (GREATEM) 시스템은 항공 시간영역 전자탐사에서 가용한 탐사심도를 높이기 위한 목적으로 개발되었으며, 일본 북동부의 반다이 산 조사에 시험 적용하였다 반다이 산은 해발 1819 m의 안산암 층운화산이다. 1888년 7월에 일어난 화산분출은 북쪽 분화구에 발굽모양의 붕피 암벽과 기반부에 붕락 쇄설암을 남겼다. 이전의 연구 결과들은 반다이 산에서 실시된 GREATEM과 다른 지구물리 기법을 통해 밝혀진 반다이 산의 구조와 붕괴 메커니즘에 대한 자료의 비교분석을 가능하게 하였다. 최근의 화구구에서는 비저항 구조가, 붕괴된 분화구 지역에서는 전도성 구조가 발견되었다. 붕괴벽 주위의 전도성 구조는 열수의 작용으로 인한 변진대와 일치하고 있으며. 이러한 견과는 1888년 발생한 분출과 관련된 붕괴의 주된 원인이 화산체 내부를 구조적으로 약화시킨 열수변질작용과 관련 있다는 주장을 뒷받침하고 있다
Thermodynamic and Transport Properties of Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8)
Masakazu Ito,Toru Hisamatsu,Tsugumi Rokkaku,Osamu Murayama,Iduru Shigeta,Masahiko Hiroi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have measured the temperature (T) dependences of the electric resistivity, ρ(T), and thespecific heat, Cp(T), of the ferromagnetic full-Heusler compound Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8). ρ(T) shows a metallic behavior (@ρ/@T > 0) for 20 . T ≤ 300 K and nominal upturn at around20 K for all samples. In the low-temperature range, Cp(T) can be described by Debye’s T3 law. Although the coefficient of the lattice part of Cp(T), β, is insensitive for the Fe concentration x,the electronic specific heat part, , decreases with increasing x. The values of the total densities ofstates (Dtotal(EF )) estimated fromwere 12.8, 10.1, and 9.6 states/f.u. eV for x = 1.3, 1.6, and1.8, respectively. The values of majority spin band (D"(EF )) and the minority spin band (D#(EF ))were also estimated usingand the spin polarization P defined by Andreev-reflection experiments.