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Yasuhito Ohsaka,Hoyoku Nishino 한국유전학회 2011 Genes & Genomics Vol.33 No.6
In order to investigate variation in nucleotide sequences in normal individuals, we isolated genomic DNA from the blood of healthy Japanese individuals and sequenced promoters in the p14^(ARF)/INK4 (p16^(INK4a) and p15^(INK4b)) locus genes and introns in murine double minute 2, vitamin D receptor, and presenilin 1 genes. We found nucleotide alterations in the promoters,including substitutions at positions -2610 and -1536and deletions at positions -4489, -4488 to -4483, -2241 to -2240, and -2221 to -2218 in p14ARF and substitutions at positions -1643 and -1270 in p15^(INK4b), and we found that each individual harbored polymorphisms in the locus promoters and/or introns. Some polymorphic nucleotides were included in the same set of associatively altered nucleotides. Reporter gene analysis by using luciferase revealed that altered nucleotides,including those containing the set, changed luciferase gene activity in some cell lines. The results of this study show that multi-nucleotide sequences are altered in each normal Japanese individual.
A SOD-Based Amperometric Biosensor for Superoxide Ion
Tian, Yang,Okajima, Takeyoshi,Kitamura, Fusao,Ohsaka, Takeo The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.4
A superoxide dismutase (SOD)-based superoxide ion $(O_2^-)$ sensor was fabricated by immobilizing SOD on a self-assembled monolayer (SAM) of 3-mercaptopropionic acid (MPA) which was prepared on a gold electrode. The SAM of MPA was found to function as an effective promoter for the electrode reaction of SOD. The amperometric response to $(O_2^-)$ was monitored at 300mV and -100mV vs. Ag/ Agel in 5mM phosphate buffer solution containing $KO_2$. The sensor was proved to have a high sensitivity, selectivity and short response time (<5 s) and negligible interference.
Noh, S.,Kwon, C.,Hwang, J.,Ohsaka, T.,Kim, B. J.,Kim, T. Y.,Yoon, Y. G.,Chen, Z.,Seo, M.,Han, B. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.22
<P>In this study, we report self-assembled nitrogen-doped fullerenes (N-fullerene) as non-precious catalysts, which are active for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and thus applicable for energy conversion and storage devices such as fuel cells and metal-air battery systems. We screen the best N-fullerene catalyst at the nitrogen doping level of 10 at%, not at the previously known doping level of 5 or 20 at% for graphene. We identify that the compressive surface strain induced by doped nitrogen plays a key role in the fine-tuning of catalytic activity.</P>
Simultaneous Electroanalysis of Nitric Oxide and Nitrite
Oritani, Tadato,Okajima, Takeyoshi,Kitamura, Fusao,Ohsaka, Takeo The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.4
The simultaneous sensing of nitric oxide (NO) and its metabolite, nitrite $(NO_2^-)$ has been studied by Osteryoung square-wave voltarnmetery (OSWV) in physiological pH solution (0.1 M phosphate buffer solution, pH 7.2). Using an electrochemically pretreated glassy carbon (GC) electrode, OSWV was successfully applied to observe the well-separated oxidation peaks at ca. 0.58 and 0.80V vs. Ag/AgCI for NO and $(NO_2^-)$, respectively. This clear separation between the NO and $(NO_2^-)$ oxidation peaks may be due to the formation of surface oxides (e.g., quinone (C=O) or carboxylic $(COO^-)$ group) and surface defects introduced by the electrochemical pretreatment of GC electrodes.
Poly(N,N-dimethlyaniline)가 코팅된 Boron doped diamond 전극을 이용한 신경전달 물질의 전기화학적 검출
조은인,황진희,박수길,Okajima, Takeyohi,Ohsaka, Takeo,Fujishima, Akira 한국공업화학회 2004 응용화학 Vol.8 No.1
The boron-doped conductive diamond electrode(BDD) was used as a working electrode for detection of serotonin, (5-hydroxytryptamine)(SE) in the presence of ascorbic acid(AA) which is mainly contained from vitamin C in human blood. In this study, the cationic polymer film of N,N-dimethylaniline (DMA) was electrochemically deposited on the BDD electrode surface to modify the characteristics of electrode. The PDMA film-coated BDD electrode can separate the oxidation potentials of AA and (SE) which coexist in a homogeneous solution. The selective detection of SE is achieved at the PDMA film-coated BDD electrode in the presence of AA.