| Sinohyliopsis schlegeli珍珠层中Si、Mn、Fe和Sr离子的微生物固定化和环境因素(英文) |
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| 摘 要： | 在日本Ishikawa Prefecture的Kanazawa大学进行了为期8个月的排水池培养实验,利用特征水和营养元素的基本因素对Sinohyliopsis schlegeli贝壳珍珠质所记录的环境变化进行观察。在2007年5月份到11月份之间,每个月向贝壳珍珠质注入四环素作为指示剂。定期测量水质,诸如pH、氧化还原势、电导率、溶解氧以及水温,通过过滤法除掉水中悬浮固体并进行光学显微镜和荧光X射线分析以及扫描电镜-能量色散X射线观察(SEM-EDX)。对贝壳珍珠质的X射线荧光化学分析表明那些富含四环素的层对应高含量的Si、Mn、Fe和Sr离子。氧化还原势和溶解氧分析都证明在珍珠质中存在层。排水池中悬浮物质主要由Si、Mn和Fe元素组成,这与2007年夏季贝壳珍珠层的生物固定化中所涉及的元素一致。SEM-EDX分析证明离子来自Siderocapsa sp.和Gallionella ferruginea硅藻的胃部。冬季几乎没有发生离子的生物固定化。结果表明在层化的贝壳珍珠质中存在元素的固定化,Sinohyliopsis schlegeli在夏季以离子为食来生长珍珠质。具有这些生物氧化物的Sinohyliopsis schlegeli可能对自然界水体中重金属的清除有一定的贡献。
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| 关 键 词： | Sinohyliopsis schlegeli 珍珠层 四环素 Mn、Fe、Si、Sr固定化 硅藻 Siderocapsa sp. Gallionella ferruginea |
MICROBIAL IMMOBILIZATION OF Si, Mn, Fe, AND Sr IONS IN THE NACREOUS LAYER OF Sinohyliopsis schlegeli AND ENVIRONMENTAL FACTORS |
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| Authors: | Kazue Tazaki Issei Morii |
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| Abstract: | Environmental changes recorded in the shell nacre of Sinohyliopsis schlegeli were observed with elemental factors of characteristic water and nutrition for eight months in a cultivated drainage pond at Kanazawa University, Ishikawa Prefecture, Japan. Tetracycline as an indicator was injected into the shell nacre once every month from May to November in 2007. Water qualities such as the pH, redox potential, electrical conductivity, dissolved oxygen concentration, and water temperature were measured periodically, and the suspended solids in the water were removed by filtration for optical microscopy, X-ray fluorescence analysis, and scanning electron microscopyenergy dispersive X-ray (SEM-EDX) observations. X-ray fluorescence chemical analysis of shell nacre indicated layers with strong tetracycline accumulation corresponding to high concentrations of Si, Mn, Fe, and Sr ions. The redox potential and dissolved oxygen concentration measurements supported the existence of layers in the nacre. The suspended materials in the drainage pond water comprised mainly of Si, Mn, and Fe elements, which were the same elements involved in microbial immobilization in the shell nacre during the summer of 2007. SEM-EDX analyses confirmed that the ions originated from diatoms, Siderocapsa sp. and Gallionella ferruginea in the stomach. There was little microbial immobilization of the ions in winter. The results suggested elemental immobilization in the layered shell nacre and indicated that Sinohyliopsis schlegeli fed on the ions, to grow the nacre during summer. Sinohyliopsis schlegeli with these biogenic oxides might contribute to the scavenging of heavy metals in natural water. |
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| Keywords: | Sinohyliopsisschlegeli Siderocapsasp Gallionellaferruginea Sinohyliopsisschlegeli nacreouslayer tetracycline MnFeSiSrimmobilization diatom Siderocapsasp Gallionellaferruginea |
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