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| 1.
論文 |
論文
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Tanimoto, Yoshifumi ; Izumi, Syunsuke ; Furuta, Koichi ; Suzuki, Tomoe ; Fujiwara, Yoshihisa ; Fujiwara, Masao ; Hirata, Toshifumi ; Yamada, Sotoshi ; 山田, 外史
概要:
The effects of high magnetic field on Euglena gracilis Z were examined. When a horizontal magnetic field gradient (ca. 400 T2m-1) was applied, living E. gracilis moved to a higher field (positive magnetotaxis), whereas dead one
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gathered in a lower field. Magnetotaxis was not observed in a uniform magnetic field of 8 T. E. gracilis was oriented almost perpendicularly to the magnetic field regardless of life and death. Magnetotaxis of E. gracilis would be explained by taking into account inhomogeneous magnetic forces on and magnetic orientation of E. gracilis.
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| 2.
論文 |
論文
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山田, 外史 ; 橋口, 敬 ; 細野, 隆次 ; 山本, 博 ; 別所, 一夫 ; 上野, 照剛 ; 谷本, 能文 ; Yamada, Sotoshi ; Hashiguchi, Takashi ; Hosono, Ryuji ; Yamamoto, Hiroshi ; Bessho, Kazuo ; Ueno, Shoogo ; Tanimoto, Yoshifumi
概要:
金沢大学理工研究域電子情報学系<br />Electromagnetic devices such as superconducting magnets, magnetically levitated vehicles and magnet
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ic resonance imaging(MRI) create strong magnetic fields within their immediate vicinity. This has generated some concerns over the effects that these fields may have on the outside environment and in particular on living organisms. 50/60Hz magnetic fields are of special concern because living organisms are exposed to them on a continuing basis.We investigate the influence of a strong 60Hz AC magnetic field of 1.2T on organisms. The high AC magnetic field is generated by using a multilayer eddy-current type AC magnetic generator developed in our laboratory. In this paper, in vitro experiments were performed with biochemical reactions, enzyme and restriction endonuclese activities.As a result, the magnetic field inhibited catalase activity slightly only in biochemical reactions. Other reactions such as β-galactosidase activity and restriction endonuclese activity were not influenced at all. The results suggest that high 60Hz AC magnetic fields may influence biological functions in some organisms.
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| 3.
論文 |
論文
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Kohtani, Shigeru ; Sugiyama, Masahide ; Fujiwara, Yoshihisa ; Tanimoto, Yoshifumi ; Nakagaki, Ryoichi
概要:
Magnetic field effects (MFE) on asymmetric photolysis involving a biradical intermediate have been investigated on a kin
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etic model where an intersystem crossing (ISC) of the intermediate is taken into account. Changes in the enantiomeric excesses (ee) of chiral substances with circularly polarized light (CPL) irradiation have been simulated, and the necessary conditions for observing the MFE were obtained. The asymmetric photolysis of racemic 2-phenylcycloalkanones (2-PCAs) with CPL has been carried out in both the presence and absence of a magnetic field. Since the anisotropy g factors of 2-PCAs are considerably large, the CPL-induced ee are achieved to a few percent after 90% decomposition though the MFE are not observed. The photolysis mechanism of 2-PCAs in an air-saturated solution has been also clarified. Triplet acyl–benzyl biradicals, formed via photochemical α-cleavage of 2-PCAs, react with O2 dissolved in the solution and result in the formation of acetophenone and alkenoic acids. The bimolecular reactions are diffusion-controlled and the rates are comparable to those of ISC to the singlet biradicals for all 2-PCAs. The recombination yields of the biradicals are sufficiently large. However, the biradical ISC rate shows little magnetic field dependence, which explains the absence of the MFE in this asymmetric photolysis.
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| 4.
図書 |
図書
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M. Yamaguchi, Y. Tanimoto (eds.)
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