• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chinese science bulletin >Biomineralization process occurring in iron mud of coastal seepage area of Zhoushan Island, Zhejiang Province
【24h】

Biomineralization process occurring in iron mud of coastal seepage area of Zhoushan Island, Zhejiang Province

机译：浙江舟山岛沿海渗水区铁泥中生物矿化过程

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The biomineralization process of iron oxidizing bacteria and its influence on accumulation of metals were investigated by modern biological observation techniques (i.e., SEM and TEM) and geochemical methods, in coastal area of Zhoushan Island, Zhejiang province where a thick ancient wood layers were buried, Results show that the iron mud samples mainly contain Leptothrix-like sheaths and Gallionella-like stalks, which are known as neutrophilic iron-oxidizing bacteria. These two bacteria are present as obviously different abundance in two sampling sites, which may be regulated by the geochemistry of seepage water. The biomineralization product of iron oxidizing bacteria is ferrihydrite, a poorly ordered iron oxide, and formation of amorphous mineral is affected by the factors of bacteria, minor Si and temperature preventing any further transformation into more crystalline phases. Organic functional groups, extracellular polymers and surface charges can provide favorable nucleation sites or template for formation of iron precipitates on the bacterial surface. The mineralization process of the iron oxidizing bacteria is divided into different stages, i.e., extracellular mineralization, intracellular mineralization and the whole cell mineralization. Furthermore, due to BIOS containing the bacterial organic matter, the accumulation capacity of metals specially Fe and Co is highly increased, suggesting that BIOS exert a degree of controlling in the cycling of metal elements in seepage area.
机译：利用现代生物观察技术（即SEM和TEM）和地球化学方法，研究了在浙江省舟山岛沿岸深埋古木层的铁氧化细菌的生物矿化过程及其对金属积累的影响。结果表明，铁泥样品主要含有Leptothrix样的鞘和Gallionella样的茎，被称为嗜中性铁氧化细菌。这两种细菌在两个采样点的丰度明显不同，这可能受渗水地球化学的调节。铁氧化细菌的生物矿化产物是亚铁酸盐，一种有序的氧化铁，无定形矿物的形成受到细菌，微量硅和温度等因素的影响，从而阻止了其进一步转变成更多的结晶相。有机官能团，细胞外聚合物和表面电荷可为细菌表面上形成铁沉淀物提供有利的成核位点或模板。铁氧化细菌的矿化过程分为不同的阶段，即细胞外矿化，细胞内矿化和全细胞矿化。此外，由于BIOS包含细菌有机物，金属特别是Fe和Co的积累能力大大提高，这表明BIOS在渗流区域中的金属元素循环中发挥了一定程度的控制作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号