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Your search keyword '"Matsumoto, Norio"' showing total 337 results
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337 results on '"Matsumoto, Norio"'

40. Anaerobic respiration using Fe(sup)3+, S(sup)0, and H(sub)2 in the chemolithoautotrophic bacterium Acidithiobacillus ferrooxidans

Author

Ohmura, Naoya, Sasaki, Kazuhiro, Matsumoto, Norio, and Saiki, Hiroshi

Subjects
Microbial respiration -- Physiological aspects, Oxidation-reduction reaction -- Analysis, Cytochrome c -- Physiological aspects, Energy metabolism -- Regulation, Biological sciences
Abstract

The primary energy source for the growth of the Acidithiobacillus ferrooxidans is derived from the anaerobic respiration, in which the iron or sulfur serves as an electron acceptor with hydrogen or sulfur serving as an electron donor. Data indicate that the respiratory process is coupled to a c-type cytochrome oxidation.

Published
2002

41. Fundamental studies of glucose oxidase deposition on a Pt electrode

Author

Matsumoto, Norio, Chen, Xiaohong, and Wilson, George S.

Subjects
Glucose -- Research, Electrochemistry -- Research, Oxidases -- Research, Chemistry
Abstract

The direct electrodeposition of glucose oxidase (EC 1.1.3.4) on a platinum electrode was investigated as a means for controlled immobilization. The presence of a nonionic detergent, Triton X-100, was found essential to produce a multilayered deposit. Moreover, to work properly, the detergent must be present above its critical micelle concentration. Under these conditions, a deposit of ~50 enzyme layers (480 nm), with surface uniformity of [+ or -] 20 nm, was verified using an electrochemical quartz crystal microbalance and by atomic force microscopy. In the absence of detergent, a layer of 25 nm is formed. Contrary to most previous claims, the deposition, which is potential dependent but optimal at 1.3 V versus AgCl/ Ag electrode, is not electrophoretically driven, but is instead controlled by a lowering of the pH at the electrode surface due to concomitant oxygen evolution.

Published
2002

42. Electrochemically mediated electrodeposition/ electropolymerization to yield a glucose microbiosensor with improved characteristics

Author

Chen, Xiaohong, Matsumoto, Norio, Hu, Yibai, and Wilson, George S.

Subjects
Electrochemistry -- Research, Biosensors -- Research, Glucose -- Research, Chemistry
Abstract

A procedure is described that provides for electrochemically mediated deposition of enzyme and a polymer layer permselective for endogenous electroactive species. Electrodeposition was first employed for the direct immobilization of glucose oxidase to produce a uniform, thin, and compact film on a Pt electrode. Electropolymerization of phenol was then employed to form an anti-interference and protective polyphenol film within the enzyme layer. In addition, a stability-reinforcing membrane derived from (3-aminopropyl)trimethoxysilane was constructed by electrochemically assisted cross-linking. This hybrid film outside the enzyme layer contributed to the improved stability and permselectivity. The resulting glucose sensor was characterized by a short response time (

Published
2002

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