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RISS 인기검색어
- 검색키워드
- 저자 : Tetsuo Ono (검색결과 2 건)
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Possible Prevention of Neonatal Death: A Regional Population-Based Study in Japan
Shigeki Koshida,Takahide Yanagi,Tetsuo Ono,Shunichiro Tsuji,Kentaro Takahashi 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.2
Purpose: The neonatal mortality rate in Japan has currently been at the lowest level in the world. However, it is unclear whether there are still some potentially preventable neonatal deaths. We, therefore, aimed to examine the backgrounds of neonatal death and the possibilities of prevention in a region of Japan. Materials and Methods: This is a population-based study of neonatal death in Shiga Prefecture of Japan. Results: The 103 neonatal deaths in our prefecture between 2007 and 2011 were included. After reviewing by a peer-review team, we classified the backgrounds of these neonatal deaths and analyzed end-of-life care approaches associated with prenatal diagnosis. Furthermore, we evaluated the possibilities of preventable neonatal death, suggesting specific recommendations for its prevention. We analyzed 102 (99%) of the neonatal deaths. Congenital malformations and extreme prematurity were the first and the second most common causes of death, respectively. More than half of the congenital abnormalities (59%) including malformationsand chromosome abnormality had been diagnosed before births. We had 22 neonates with non-intensive care including eighteen cases with congenital abnormality and four with extreme prematurity. Twenty three cases were judged to have had some possibility of prevention with one having had a strong possibility of prevention. Among specific recommendations of preventableneonatal death, more than half of them were for obstetricians. Conclusion: There is room to reduce neonatal deaths in Japan. Prevention of neonatal death requires grater prenatal care by obstetriciansbefore birth rather than improved neonatal care by neonatologists after birth.
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Synthesis and photochemical properties of α-diketoporphyrins as precursors for π-expanded porphyrins
Yamada, Hiroko,Kuzuhara, Daiki,Ohkubo, Kei,Takahashi, Tetsuro,Okujima, Tetsuo,Uno, Hidemitsu,Ono, Noboru,Fukuzumi, Shunichi The Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.15
<p>A new α-diketoporphyrin and the corresponding Pd complex were prepared from the monoanthroporphyins and their photochemical properties were investigated by measurements of absorption and emission spectra, fluorescence lifetimes, laser flash photolysis, cyclic voltammetry, and theoretical calculations. Intramolecular electron transfer from the porphyrin singlet excited state to the diketone moiety was observed for the free base α-diketoporphyrin in benzonitrile, but this was not observed in toluene. Photoreactivity of the α-diketoporphyrins was also examined by irradiation at the Soret and Q bands. When the Soret band of the freebase α-diketoporphyrin was irradiated, cleavage of the diketone moiety occurred to afford the monoanthroporphyrin with the release of two CO molecules quantitatively in both benzonitrile and toluene. When the Q band of the freebase α-diketoporphyrin was irradiated, no photocleavage reaction occurred in toluene. In contrast to the freebase α-diketoporphyrin, the photocleavage reaction of the Pd complex occurred with irradiation at the Q band as well as the Soret band to afford the monoanthroporphyrin quantitatively in toluene. The photocleavage reaction proceeded much more effectively in toluene than in benzonitrile. The occurrence of rapid photoinduced electron transfer from the singlet excited state porphyrin to the diketone moiety, which was detected by femtosecond laser flash photolysis measurements, results in a significant decrease in the singlet excited state lifetime, prohibiting the photocleavage reaction in benzonitrile. Thus, the Pd α-diketoporphyrin can act as an excellent precursor for the corresponding acene in toluene. The photocleavage process provides a convenient and inexpensive method to make the thin film.</p> <P>Graphic Abstract</P><P>A new α-diketoporphyrin and its Pd complex were prepared and successfully converted into the corresponding monoanthroporphyins by photoirradiation of the porphyrin moieties with release of two CO molecules quantitatively. <img src='http://pubs.rsc.org/ej/JM/2010/b923220f/b923220f-ga.gif'> </P>
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