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( Isamu Maeda ),( Hirokazu Sakurai ),( Kazuyuki Yoshida ),( Mohammad Shohel Rana Siddiki ),( Tokuo Shimizu ),( Motohiro Fukami ),( Shunsaku Ueda ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.12
Recombinant Rhodopseudomonas palustris, harboring the carotenoid-metabolizing gene crtI (CrtIBS), and whose color changes from greenish yellow to red in response to inorganic As(III), was cultured in transparent microplate wells illuminated with a light emitting diode (LED) array. The cells were seen to grow better under near-infrared light, when compared with cells illuminated with blue or green LEDs. The absorbance ratio of 525 to 425 nm after cultivation for 24 h, which reflects red carotenoid accumulation, increased with an increase in As(III) concentrations. The detection limit of cultures illuminated with near-infrared LED was 5 μg/l, which was equivalent to that of cultures in test tubes illuminated with an incandescent lamp. A near-infrared LED array, in combination with a microplate, enabled the simultaneous handling of multiple cultures, including CrtIBS and a control strain, for normalization by the illumination of those with equal photon flux densities. Thus, the introduction of a near-infrared LED array to the assay is advantageous for the monitoring of arsenic in natural water samples that may contain a number of unknown factors and, therefore, need normalization of the reporter event.
Induction of allergic contact dermatitis by astigmatid mite-derived monoterpene, α-acaridial
Toshio Sasai,Yunosuke Hirano,Sayaka Maeda,Isamu Matsunaga,Atsushi Otsuka,Daisuke Morita,Ritsuo Nishida,Hideo Nakayama,Yasumasa Kuwahara,Masahiko Sugita,Naoki Mori 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
α-Acaridial [2(E)-(4-methyl-3-pentenyl)butenedial] is a novel monoterpene secreted from the house dust mites. Because of its molecular nature of a highly reactive, small lipidic compound, we addressed whether α-acaridial might function as a haptenic allergen that induced allergic contact dermatitis. Mice sensitized with α-acaridial were challenged by the same antigen on the ear skin. After 2 days, significant ear swelling with a prominent infiltration of CD4+ T lymphocytes was observed. In vitro, α-acaridial exhibited an outstanding ability to quickly interact with and chemically modify a reference protein. Virtually all cysteine residues and a sizable fraction of lysine residues were found to be selectively modified, suggesting that α-acaridial could potentially interact with any proteins. Previously, numerous mite-derived proteinaceous allergens have been associated with contact dermatitis. Our study now emphasizes that small lipidic compounds released from mites comprise a new class of mite allergens, and therefore, is of significant medical implications.
Isamu Nishida,Masato Maeda,Tsuneo Kawano,Keiichi Shirase (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Factory automation and efficiency-oriented unmanned factories have become the major trend in manufacturing systems in recent years. However, human-centered manufacturing is gaining attention because of the flexibility it offers to manufacturing systems in terms of both product variety and volume. Although some digital human models capable of estimating the power generated by human muscles during various manufacturing-related tasks have been developed, a more effective method of analyzing muscle power is required to better estimate human muscle power. In the present study, a new musculoskeletal model taking the function of bi-articular muscles into consideration is applied to estimate the power generated by human muscles. The purpose of this study is to optimize working conditions that satisfy both the height of subjects and their maximum muscle power during a lifting operation. Results indicate the model is able to predict the heaviest weight and maximum height that this weight can be lifted to keep muscle power of the upper limb of a subject under 70% of the maximum muscle power. Moreover, the analyzed muscle power of the upper limb from experimental lifting operations is in good agreement optimized environments where humans can work efficiently and safely considering their physical characteristics.
A Behavior of the Diffuser Rotating Stall in a Low Specific Speed Mixed-Flow Pump
Miyabe, Masahiro,Furukawa, Akinori,Maeda, Hideaki,Umeki, Isamu,Jittani, Yoshinori Korean Society for Fluid machinery 2009 International journal of fluid machinery and syste Vol.2 No.1
The flow instability in a low specific speed mixed-flow pump, having a positive slope of head-flow characteristics was investigated. Based on the static pressure measurements, it was found that a rotating stall in the vaned diffuser occurs at about 65% flow rate of best efficiency point (BEP). A dynamic Particle Image Velocimetry (DPIV) measurement and the numerical simulations were conducted in order to investigate the flow fields. As a result, the diffuser rotating stall was simulated even by Computational Fluid Dynamics (CFD) and the calculated periodic flow patterns agree well with the measured ones by DPIV. It is clarified that a periodical large scaled backflow, generated at the leading edge of the suction surface of the diffuser vane, causes the instability. Furthermore, the growth of the strong vortex at the leading edge of the diffuser vane induces the strong backflow from the diffuser outlet to the inlet. The scale of one stall cell is covered over four-passages in total thirteen vane-passages.