• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied and Environmental Microbiology >Isolation and characterization of an acidophilic, heterotrophic bacterium capable of oxidizing ferrous iron.
【24h】

Isolation and characterization of an acidophilic, heterotrophic bacterium capable of oxidizing ferrous iron.

机译：能够氧化亚铁的嗜酸性异养细菌的分离和鉴定。

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A heterotrophic bacterium, isolated from an acidic stream in a disused pyrite mine which contained copious growths of "acid streamers," displayed characteristics which differentiated it from previously described mesophilic acidophiles. The isolate was obligately acidophilic, with a pH range of 2.0 to 4.4 and an optimum pH of 3.0. The bacterium was unable to fix carbon dioxide but oxidized ferrous iron, although at a slower rate than either Thiobacillus ferrooxidans or Leptospirillum ferrooxidans. Elemental sulfur and manganese(II) were not oxidized. In liquid media, the isolate produced macroscopic streamerlike growths. Microscopic examination revealed that the bacterium formed long (greater than 100 microns) filaments which tended to disintegrate during later growth stages, producing single, motile cells and small filaments. The isolate did not appear to utilize the energy from ferrous iron oxidation. Both iron (ferrous or ferric) and an organic substrate were necessary to promote growth. The isolate displayed a lower tolerance to heavy metals than other iron-oxidizing acidophiles, and growth was inhibited by exposure to light. There was evidence of extracellular sheath production by the isolate. In this and some other respects, the isolate resembles members of the Sphaerotilus-Leptothrix group of filamentous bacteria. The guanine-plus-cytosine content of the isolate was 62 mol%, which is less than that recorded for Sphaerotilus-Leptothrix spp. and greater than those of L. ferrooxidans and most T. ferrooxidans isolates.
机译：在废弃的黄铁矿中从酸性流中分离出的异养细菌，其中含有大量的“酸性流光”，其特征与以前描述的嗜温嗜酸细胞有所区别。该分离物专为嗜酸的，pH范围为2.0至4.4，最适pH为3.0。该细菌不能固定二氧化碳，但能氧化亚铁，尽管其速度比铁氧化硫杆菌或铁氧化钩端螺旋体慢。元素硫和锰（II）未被氧化。在液体培养基中，分离物产生了宏观的流光状生长。显微镜检查显示该细菌形成了长（大于100微米）的细丝，这些细丝在以后的生长阶段趋于分解，产生单个活动细胞和细丝。分离物似乎没有利用亚铁氧化的能量。铁（铁或三价铁）和有机底物都是促进生长所必需的。该分离物对重金属的耐受性低于其他氧化铁的嗜酸菌，并且暴露于光下抑制了其生长。有证据表明分离株会产生细胞外鞘。在此方面和其他方面，分离物类似于丝状细菌的Sphaerotilus-Leptothrix组成员。分离物中的鸟嘌呤加胞嘧啶含量为62 mol％，低于Sphaerotilus-Leptothrix spp记录的含量。并且比L. ferrooxidans和大多数T. ferrooxidans分离株要大。

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