Accumulation of alkaline earth metals by the green macroalga Bryopsis maxima

Accumulation of alkaline earth metals by the green macroalga Bryopsis maxima
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绿色大型藻类 Bryopsis maxima 积累碱土金属

DOI:
10.1007/s10534-015-9843-y
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发表时间:
2015
期刊:
影响因子:
3.5
通讯作者:
Hiroyuki Satoh
Hiroyuki Satoh
中科院分区:
生物学3区
文献类型:
--
作者:
Shigekazu Takahashi;Kyoko Aizawa;Saki Nakamura;Katsumi Nakayama;Shingo Fujisaki;Soichiro Watanabe;Hiroyuki Satoh

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2011年福岛第一核电站事故发生25天后,我们从日本太平洋沿岸采集绿色大型绿藻类(Bryopsis maxima)的样本。辐射分析表明,B.最大发射了非常高的γ辐射131 I,134 Cs,137 Cs和140 Ba作为235 U的裂变产物。有趣的是,B。最大量的天然存在的放射性核素来自226 Ra和228 Ra。元素含量分析表明,B.海蜇富集了大量的海洋元素,特别是碱土金属Sr(15.9g/kg干重)和Ba(3.79g/kg干重)含量较高,而Ca含量(12.5g/kg干重)低于Sr,仅为日本70种海藻平均含量的61%。时间过程分析确定的放射性85锶掺入到菌体的速率约为0.13克锶每干千克菌体每天。B.亚细胞分级最大细胞的结果表明,大部分的85 Sr定位在可溶性部分,主要是在液泡或胞质溶胶。由于85 Sr放射性可透过透析膜,因此85 Sr被认为是无机离子和/或与小分子结合的形式。用硫酸钠沉淀分析表明,超过70%的Sr没有以SrSO 4沉淀,表明一定比例的Sr可能与B中的小分子结合。马克西姆
Twenty-five days after the disaster at the Fukushima Daiichi nuclear power plant in 2011, we collected samples of the green macroalgaBryopsis maximafrom the Pacific coast of Japan.Bryopsis maximais a unicellular, multinuclear, siphonous green macroalga. Radiation analysis revealed thatB. maximaemitted remarkably high gamma radiation of131I,134Cs,137Cs, and140Ba as fission products of235U. Interestingly,B. maximacontained naturally occurring radionuclides derived from226Ra and228Ra. Analysis of element content revealed thatB. maximaaccumulates many ocean elements, especially high quantities of the alkaline earth metals Sr (15.9 g per dry-kg) and Ba (3.79 g per dry-kg), whereas Ca content (12.5 g per dry-kg) was lower than that of Sr and only 61 % of the mean content of 70 Japanese seaweed species. Time-course analysis determined the rate of radioactive85Sr incorporation into thalli to be approximately 0.13 g Sr per dry-kg of thallus per day. Subcellular fractionation ofB. maximacells showed that most of the85Sr was localized in the soluble fraction, predominantly in the vacuole or cytosol. Given that85Sr radioactivity was permeable through a dialysis membrane, the85Sr was considered to be a form of inorganic ion and/or bound with a small molecule. Precipitation analysis with sodium sulfate showed that more than 70 % of the Sr did not precipitate as SrSO4, indicating that a proportion of the Sr may bind with small molecules inB. maxima.
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