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DNA Ligand - Redox Active Molecule Conjugates as an Electrochemical DNA Probe
Ihara, Toshihiro,Maruo, Voshiyuki,Uto, Yoshihiro,Takenaka, Shigeori,Takagi, Makoto 한국분석과학회 1995 분석과학 Vol.8 No.4
Toward the development of universal, sensitive, and convenient method of DNA (or RNA) detection, two kinds of electrochemically active DNA ligands. acridine - viologen and oligonucleotide - ferrocene conjugate, were prepared. Thermodynamic and electrochemical study revealed that these probes bound strongly to DNA, and showed a typical cyclic voltammograms, indicating a potential for use as a reversible electrochemical labelling agent for DNA. Especially, using the electrochemically active oligonucleotide, we have been able to demonstrate the detection of DNA at femtomole levels by HPLC equipped with ordinary electrochemical detector (ECD). These results lead to the conclusion that the redox-active probes are very useful for the microanalysis of nucleic acid due to the stabilily of the complexes, high detection sensitivity, and wide applicability to the target structures (single- and double strands) and sequences.
Ihara, Chie,Kagimoto, Takashi,Masumoto, Yukio,Yamagata, Toshio The Korean Society of Oceanography 2002 Journal of the Korean Society of Oceanography Vol.37 No.3
Using OGCM results, we have shown that the ring-like cold baroclinic eddies associated with cyclonic circulation are shed from late summer to early fall near the Izu-Ogasawara Ridge from the Kuroshio Extension owing to baroclinic instability. On the other hand, warm baroclinic eddies are generated by the intensified western boundary current associated with the warm anomaly accumulated near the Ridge in winter, which corresponds to the basin-wide barotropic intensification of the wind-driven gyre in winter. We are successful in reproducing the behavior of those meso-scale eddies using a simple two-layer primitive equation model driven by seasonal winds associated with the positive curl. Those eddies carry barotropic seasonal signals originated in the Pacific Basin quite slowly west of the ridge; this process introduces a phase lag in the timing of the seasonal maximum transport in the Philippine Basin west of the ridge. It Is demonstrated that the existence of bottom topography, baroclinicity, and nonlinearity due to advection are three necessary elements for the generation of these eddies south of Japan.
Construction of simple communication method by use of neuro-biological signals
Takahiro Ihara,Takenao Sugi,Makoto Eriguchi,Toyoko Asami,Masatoshi Nakamura 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Many persons suffer form severe disabilities such as armyouophic lateral selerosis (ALS) caused by neurological disorders. Such kinds of disablilities bring various restrictions to communication and circumstance in their daily life. A simple communication method using neuro-biological signal will be effective and helpful to-enhance their life quality. In this study, a simple on-off communication method using electroncephalogram(EEG) and electroculogram(EOG) was proposed. In case of EEG, parameters for linear regressive equation were selected by ATC. The results showd that the accuracy was extremely high with both communication methods.
Endoscopic features of gastrointestinal stromal tumor in the small intestine
Yutaro Ihara,Takehiro Torisu,Tomohiko Moriyama,Junji Umeno,Atsushi Hirano,Yasuharu Okamoto,Yoshifumi Hori,Hidetaka Yamamoto,Takanari Kitazono,Motohiro Esaki 대한장연구학회 2019 Intestinal Research Vol.17 No.3
Background/Aims: Gastrointestinal stromal tumor (GIST) is one of the most common types of submucosal tumors (SMTs). Because of GIST’s malignant potential, it is crucial to differentiate it from other SMTs. The present study aimed to identify characteristic endoscopic findings of GISTs in the small intestine. Methods: We reviewed the clinicopathological and endoscopic findings of 38 patients with endoscopically or surgically resected SMTs in the small intestine. SMTs were classified into GIST and non-GIST groups, and clinicopathological and endoscopic findings were compared between the 2 groups. Results: Fifteen patients had GIST and 23 patients had other types of SMTs in the small intestine. Comparison of the endoscopic findings between the 2 groups revealed that dilated vessels in the surrounding mucosa were significantly more in number in the GIST group than in the non-GIST group (P<0.05). However, there were no other differences in endoscopic findings between the 2 groups. Among patients with GISTs, the presence of dilated vessels in the surrounding mucosa was not associated with bleeding risk, tumor size, or metastasis rate at diagnosis. Conclusions: Dilated vessels in the surrounding mucosa, identified during balloon-assisted endoscopy, may be a diagnostic indicator for GIST in the small intestine. However, its clinical significance should be further analyzed.