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Circadian rhythms of resistance to UV-C and UV-B radiation in Euglena as related to 'escape from light' and 'resistance to light'
https://obihiro.repo.nii.ac.jp/records/360
https://obihiro.repo.nii.ac.jp/records/3604c4092cc-85b7-49a2-ae40-5e59cfc1f1bc
名前 / ファイル | ライセンス | アクション |
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g070202-5.pdf (329.3 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2007-02-02 | |||||
タイトル | ||||||
タイトル | Circadian rhythms of resistance to UV-C and UV-B radiation in Euglena as related to 'escape from light' and 'resistance to light' | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | antioxidant | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | L-ascorbic acid | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | circadian rhythms | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | dimethylsulfoxide | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Euglena gracilis | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | photo-oxidation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | UV-sensitivity | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Bolige, Aoen
× Bolige, Aoen× Kiyota, Maki× Goto, Ken |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Radiation-induced stress, either from visible or UV light, is strongest at midday. We found that, in the absence of stress or time cues, Euglena gracilis Z was the most resistant to UV-C and UV-B at subjective midday, whether judged from immediate or reproductive survival. The circadian UV-resistance rhythms were free-running in stationary cultures under 1-h light/1-h dark cycles or continuous darkness, indicating that cell-cycle dependent DNA susceptibility to UV was not involved. We moreover examined what was the primary cause of the circadian U-V resistance, estimated as the immediate cell survival. The half-maximal lethal dose (LD50) of UV-C at subjective midday (the most resistant phase) was 156 J/m(2), which is similar to 3-fold that at subjective midnight. The same was true for UV-B, except the LD50 was similar to 13-fold that of UV-C. Temperature during UV irradiation had little effect, indicating that survival was not mediated via enzymatic reactions. Non-enzymatic antioxidants were added 5 min before UV irradiation. Dimethylsulfoxide (a hydroxyl radical scavenger) increased survival after UV-B, but had little effect after UV-C conversely, sodium ascorbate increased survival after UV-C, but not after UV-B. These findings suggest that circadian rhythms of resistance to UVs involve a common mechanism for maximizing non-enzymatic antioxidative capacity at subjective midday, but the specific antioxidants differ. (c) 2005 Elsevier B.V. All rights reserved. | |||||
言語 | en | |||||
書誌情報 |
en : Journal of Photochemistry and Photobiology. B, Biology 巻 81, 号 1, p. 43-54, 発行日 2005-10-03 |
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出版者 | ||||||
出版者 | Elsevier | |||||
言語 | en | |||||
ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 10111344 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10686173 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | Elsevier | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |