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Mitsuru UESAKA,Atsushi FUKASAWA,Fumito SAKAMOTO,Haruyuki OGINO,Junji URAKAWA,Katsuhiro DOBASHI,Kazutaka TAKAO,Mitsuo AKEMOTO,Tomohiko YAMAMOTO,Toshinobu MIYOSHI,Toshiyasu HIGO 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
A Compton scattering X-ray source consisting of an X-band (11.424 GHz) electron linear accelerator (linac) and Q-switched Nd:YAG laser is currently under construction. Monochromatic hard X-rays are required for a variety of medical and biological applications. The new hard X-ray source produces monochromatic X-rays via collision between a 35-MeV multi-bunch (104 bunches in a 1 μs RF pulse) electron beam and 1.4 J/10 ns (532 nm) Nd:YAG laser beam. The linac uses an X-band 3.5-cell thermionic cathode RF gun and an alpha magnet as an injector. The thermionic cathode RF gun is the first of its kind and can generate a high current (2 μA) and a multi-bunch 2-MeV electron beam. To increase the efficiency of the X-ray yield, a laser pulse circulation system is adopted, that can increase the X-ray intensity by up to 50 times. This scheme can produce monochromatic tunable X-rays (10 40 keV) with intensities of 108 109 photons/sec. In addition, the X-ray energy can be changed rapidly over 40 ms by two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and an optical switch. This quick energy change is very important for living specimens and is very difficult to achieve in light sources such as a large SR (Synchrotron Radiation) source. The system can be used for dual-energy X-ray CT and subtraction X-ray CT to determine the 3D distribution of the atomic number density and electron density, and specified atomic distribution, respectively. In this paper, we describe the details of the system, report on experiments on the X-band thermionic cathode RF gun, and discuss applications of monochromatic X-rays.?
Coprecipitation of cytochrome C with calcium phosphateon hydroxyapatite ceramic
Yu Sogo,Atsuo Ito,Koshiro Fukasawa,Nao Kondo,Yusuke Ishikawa,Noboru Ichinose,Atsushi Yamazaki 한국물리학회 2005 Current Applied Physics Vol.5 No.5
Cytochrome C (cyt C), which has a molecular weight and an isoelectric point similar to those of broblast growth factor(FGF-2), was coprecipitated with calcium phosphates in the presence or absence of a hydroxyapatite ceramic (HAP) using super-saturated calcium phosphate solutions that can be prepared by mixing infusion uids. The precipitates formed in the solutionconsisted of amorphous calcium phosphate in the absence of a HAP. In the presence of a HAP, precipitates morphologically iden-tical to bone-like apatite formed a calcium phosphate layer on the surface of HAP. The optimum conditions for coprecipitation ofcyt C with calcium phosphate on HAP were a Ca/P molar ratio of 1.5 and a NaHCO3 concentration of 7.90 mM. The release of cytis also expected to be coprecipitated with calcium phosphates onto HAPs using infusion fluids..
Tomokazu Sazuka,Naoki Nihei,Kazuyoshi Nakamura,Shinichi Sakamoto,Satoshi Fukasawa,Atsushi Komaru,Takeshi Ueda,Tatsuo Igarashi,Tomohiko Ichikawa 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.3
Purpose: Single-agent interferon (IFN) is no longer regarded as a standard option for first-line systemic treatment of metastatic renal cell carcinoma (RCC) in Western countries. However, some patients with favorable-risk RCC may still achieve complete and long-lasting remission in response to IFN treatment. The present study compared favorable-risk Japanese patients with metastatic RCC Japanese patients who had been treated with IFN or tyrosine kinase inhibitor (TKI) therapy as a first-line systemic therapy. Materials and Methods: From 1995 to 2014, a total of 48 patients with favorable risk as defined by the Memorial Sloan Kettering Cancer Center criteria who did not receive adjuvant systemic therapy were retrospectively enrolled in this study. We assessed the tumor response rate, progression-free survival (PFS), and overall survival (OS). Results: The objective response rate for first-line therapy was 29% in the IFN group and 47% in the TKI group, but this difference did not reach the level of statistical significance. Median OS for IFN and TKI was 71 and 47 months, respectively (p=0.014). Median first-line PFS for IFN and TKI was 20 and 16 months, respectively (no significant difference). First-line IFN therapy did not prove inferior to TKI therapy in terms of OS according to metastatic sites. Conclusions: IFN is associated with a survival benefit in Japanese patients with favorable-risk metastatic RCC in the era of targeted therapy. Further prospective study is needed.