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Masamitsu Tanaka Manabu Kinoshita Yasuo Yoshihara Nariyoshi Shinomiya Shuhji Seki Koichi Nemoto Yuji Morimoto 《Photochemistry and photobiology》2010,86(2):403-409
Although there have been some reports about the cytotoxic effects of photodynamic therapy (PDT) on multidrug-resistant bacteria, there have been few reports in which favorable results of PDT on a local infection site are described. This study aimed to verify the hypothesis that the low efficacy of PDT on a local infection site is due to the cytotoxic effect of PDT on leukocytes. PDT using Photofrin® exerted significant cytotoxicity for cultured methicillin-resistant Staphylococcus aureus (MRSA). Nevertheless, this therapeutic modality was not effective for a murine MRSA arthritis model. Approximately 30% of intra-articular leukocytes, mainly neutrophils, died immediately after PDT, and a further decrease in the number of intra-articular leukocytes and atrophy of the synovial tissue were seen 24 h after PDT. Isolated peripheral neutrophils showed significant affinity for Photofrin® and showed significant morphological damage, resulting in cell death, when they were subject to PDT using Photofrin®. These results indicate that intra-articular neutrophils have an influence on the effects of PDT for MRSA arthritis. 相似文献
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Hisao Yoshihara 《manuscripta mathematica》1992,75(1):279-291
Let K be a purely trancendental extension of a field k with two variables. We want to classify fields {L}, which are quadratic
extension of K. First we prove the existence of a normal form of the defining equation of L. Then we give a rough classification
and several results. Lastly we mention of an application to the theory of plane curves. 相似文献
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Yoshihara HK 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2008,84(7):232-245
This review article deals with a new element 'nipponium' reported by Masataka Ogawa in 1908, and with its scientific and science historical background. Ogawa positioned nipponium between molybdenum and ruthenium in the periodic table. From a modern chemical viewpoint, however, nipponium is ascribable to the element with Z=75, namely rhenium, which was unknown in 1908. The reasons for this corrected assignment of nipponium are (1) its optical spectra, (2) its atomic weight when corrected, (3) its relative abundance in molybdenite, the same being true with rhenium. Recently some important evidence was found among the Ogawa's personal collection preserved by his family. Deciphering the X-ray spectra revealed that the measured spectra of the nipponium sample that Ogawa brought from University College, London clearly showed the presence of the element 75 (rhenium). Thus was resolved the mysterious story of nipponium, which had continued for almost a century. It is concluded that nipponium was identical to rhenium. 相似文献
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Miaki Shibaya Yosuke Suzuki Mutsuko Doro Hideaki Ishihara Nori Yoshihara Masao Enomoto 《Journal of Polymer Science.Polymer Physics》2006,44(3):573-583
The effect of soft segment component and molecular weight combination on moisture‐permeable polyurethane films was studied. Moreover, water sorption phenomenon in films was observed with infrared analysis. As for soft segment components, PTMG/PEG and PTMG/PPG were used and molecular weight combinations were changed. Different tendency appeared in the experimental results corresponding to PEG system and PPG system. Moisture permeability P in PEG system increased with increasing PEG content, but P changed little in the case of PPG system. Both hydrogen‐bonded concentration by infrared measurement and the higher order term Δh of Mooney–Rivlin plot by stress–strain relationships indicate the existence of aggregate structure of hard segment. It is considered that ether group in PEG is more active than that in PPG. Therefore, small size of aggregate structure indicated as Δh appears in PEG system owing to inhibition of aggregate structure growth. Whereas, ether group in PPG system does not inhibit hydrogen bond in urethane group and large size of aggregate structure appears. From water affinity relationship analysis, hydrophilicity of samples with PTMG/PEG = 2000/2000 increased with increasing PEG content. Consequently, it is suggested that not only size but also hydrogen‐bonded concentration of urethane group in aggregate structure affects moisture permeability. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 573–583, 2006 相似文献
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The calcination of a TiO(acac)2/Mn(acac)3/epoxy resin complex under an oxygen atmosphere successfully produced nano-sized TiO2/MnO2/carbon clusters composite material. The surface characterizations of the resulting composites indicate that they are composed of nano-sized particles of TiO2, MnO2 and carbon clusters. ESR spectral examination suggests the possibility of an electron transfer in the process of MnO2 → carbon clusters → TiO2. The visible light-responsive oxidation–reduction function of the composite materials has also been confirmed. 相似文献