METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
基本信息
- 批准号:5211932
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:
- 资助国家:美国
- 起止时间:至
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The present proposal represents an expanded effort of that undertaken in
the 1992-93 FY, which was entitled "Investigation of trace metal
sequestering by polyphosphate bodies in picoplankton." We will now focus
on the various mechanisms by which trace and heavy metals are taken up and
immobilized within the microbial consortium that are found in the natural
aquatic environments. Our approach will be to employ the transmission
electron microscope in conjunction with X-ray energy dispersive analysis
(EDX), to study bacterial-sized cells and their associated non-cellular
particulates. This qualitative and semi-quantitative approach will enable
us to analyze cells and cell constituents for their elemental content, and
make it possible for us to localize regions in which metal ions become
concentrated. Our study over the past year has been fruitful as training
ground as we now undertake examination of more complex natural aquatic
systems. We will attempt to isolate additional numerically important,
metal immobilizing species and study their propensity for metal uptake.
We will examine metal polluted aquatic sediments for bacteria and
associated particulates, important heavy metal bearing activated sludge
and attempt to localize accumulated metals in or on cells making up the
biomass. Pure cultures that take up and concentrate a heavy metal have
great potential value in the study of mechanisms involved but they also
may be developed for use in aspects of water purification, valuable metal
recovery or other practical uses. Of greater importance from an
environmental standpoint is the fact that a heavy metal can be tracked
from a sediment into a bacterial cell mass using the EM-EDX system. Many
of the bacteria can also serve as a food supply for grazing protozoa and
other invertebrate animals. Our effort in the present proposal will lay
a groundwork for these kinds of studies.
本提案代表了在
1992-93 财年,题为“微量金属的调查”
超微型浮游生物中多磷酸盐体的螯合。”我们现在将重点关注
微量金属和重金属被吸收的各种机制
固定在自然环境中发现的微生物群落内
水生环境。 我们的方法是采用传输
电子显微镜结合 X 射线能量色散分析
(EDX),研究细菌大小的细胞及其相关的非细胞
颗粒物。 这种定性和半定量方法将使
我们分析细胞和细胞成分的元素含量,以及
使我们能够定位金属离子变成的区域
集中。 一年来我们的学习和培训是卓有成效的
地面,因为我们现在对更复杂的天然水生生物进行检查
系统。 我们将尝试隔离其他重要的数字,
金属固定物质并研究它们吸收金属的倾向。
我们将检查金属污染的水生沉积物中的细菌和
伴生颗粒、重要的含重金属活性污泥
并尝试将积累的金属定位在构成细胞的细胞内或细胞上
生物量。 吸收并浓缩重金属的纯培养物
研究所涉及的机制具有巨大的潜在价值,但它们也
可开发用于水净化、贵金属等方面
回收或其他实际用途。 更重要的是来自
从环保的角度来看,重金属是可以被追踪的
使用 EM-EDX 系统将沉积物转化为细菌细胞团。 许多
细菌还可以作为放牧原生动物的食物供应和
其他无脊椎动物。 我们在本提案中的努力将在于
此类研究的基础。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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{{ truncateString('THOMAS E JENSEN', 18)}}的其他基金
A Study of Metal Sequestering and Release from Microbes
微生物中金属的螯合和释放研究
- 批准号:
6686035 - 财政年份:2003
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6501510 - 财政年份:2001
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6347533 - 财政年份:2000
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6352999 - 财政年份:2000
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6204162 - 财政年份:1999
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6107361 - 财政年份:1998
- 资助金额:
-- - 项目类别:
METAL SEQUESTERING BY MICROORGANISMS IN AND FROM AQUATIC ENVIRONMENTS
水生环境中微生物的金属螯合
- 批准号:
6240308 - 财政年份:1997
- 资助金额:
-- - 项目类别:
TARGET SITES AND COMPARTMENTALIZATION IN HEAVY METAL EXPOSED CELLS
重金属暴露细胞的靶位点和区室化
- 批准号:
3778098 - 财政年份:
- 资助金额:
-- - 项目类别:
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6501510 - 财政年份:2001
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6204162 - 财政年份:1999
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