Micro- and Nanofabric Protection of Organic Matter in Clay-rich Muds and Polychaete Fecal Pellets: Direct Visualization by TEM and Quantitative Analysis
微米和纳米织物对富含粘土的泥浆和多毛类粪便颗粒中有机物的保护:通过 TEM 和定量分析直接可视化
基本信息
- 批准号:0824569
- 负责人:
- 金额:$ 18.72万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2008
- 资助国家:美国
- 起止时间:2008-09-15 至 2012-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Intellectual Merit. This research addresses challenging issues of organic matter (OM) preservation in marine clay-rich sediment and soils using novel techniques for visualizing three dimensionally OM in nano- and microfabric signatures using transmission electron microscopy (TEM). This effort will advance the understanding of processes and mechanisms and nano- and microfabric signatures that drive OM preservation at these scales during the very early development of marine sediment. It will provide direct "cutting edge" evidence confirming or refuting concepts and ideas advanced without direct observational evidence by the scientific community concerning OM preservation in marine sediment. It will provide direct visual evidence of protection against enzymatic digestion of OM by clay fabric. Hypotheses to be tested include, (1) pore throats and tortuosity of pores impedes the movement of enzymes through clay fabric and (2) OM is preferentially sorbed onto edges of clay platelets and interstices at the junctures of clay domains. Hypothesis testing entails developing a realistic quantitative three-dimensional visual model of OM protection based on potential enzymatic digestion of specific substrates and direct TEM observations of OM distribution with respect to pores reconstructed from serial sections of sediments representing the globally most important OM depocenter. Clay is inherently electron dense and easily visualized by TEM; visualization of OM will be accomplished with electron dense stains. Smectite and illite clay samples will be studied including field collected fecal pellets from marine polychaetes. This research will advance the development of realistic conceptual models of OM preservation and ultimately organic carbon cycling based on direct visualization of organo-clay relationships and quantitative analysis. The research will also provide quantitative data for advancing (1) understanding of biogeochemical fluxes of organic carbon in marine sediments and (2) the development of emerging models addressing organo-clay preservation dynamics.Broader Impacts. A graduate student from the University of Southern Mississippi (USM) will be trained in TEM techniques and image analysis, will participate in writing manuscripts, and in presenting data at regional and national scientific meetings. Training will be offered to science education graduate students in TEM techniques and image analysis during our regular summer teaching program. Undergraduates through the local NSF REU program will assist in TEM work and image analysis and present research at local and regional meetings. The project supports three investigators at two institutions in an EPSCoR state and establishes collaboration among disciplines and institutions with CoPIs from academia and the private sector. Research results will be published in leading international journals as well as local and national professional meetings. A website will be established to make data and interpretations widely available. This project has broader societal and economic implications by increasing knowledge of OM sequestration during early sediment diagenesis and understanding the development of protokerogen and ultimately kerogen in petroleum source rocks.
智力优势。这项研究解决了具有挑战性的问题,有机质(OM)保存在海洋粘土丰富的沉积物和土壤中,使用新的技术可视化三维OM的纳米和微结构的签名,使用透射电子显微镜(TEM)。这项工作将促进对海洋沉积物早期发展过程中这些尺度上OM保存的过程和机制以及纳米和微结构特征的理解。它将提供直接的“前沿”证据,证实或反驳科学界在没有直接观测证据的情况下提出的关于海洋沉积物有机物保存的概念和想法。这将提供直接的视觉证据,防止酶消化的有机物的粘土织物。待检验的假设包括:(1)孔喉和孔隙的弯曲度阻碍酶通过粘土组构的运动;(2)OM优先吸附在粘土片晶的边缘和粘土域连接处的间隙上。假设检验需要开发一个现实的定量的三维视觉模型OM保护的基础上潜在的酶消化特定的基板和直接TEM观察OM分布相对于孔隙重建的连续部分的沉积物代表全球最重要的OM沉积中心。粘土具有固有的电子致密性,易于通过TEM可视化; OM的可视化将使用电子致密染色剂完成。将研究蒙皂石和伊利石粘土样品,包括从海洋多毛类动物现场收集的粪便颗粒。这项研究将推进现实的概念模型的有机质保存,并最终有机碳循环的基础上直接可视化的有机粘土关系和定量分析的发展。该研究还将提供定量数据,以促进(1)了解海洋沉积物中有机碳的生物地球化学通量,(2)开发解决有机粘土保存动态的新兴模型。来自南密西西比大学(USM)的一名研究生将接受TEM技术和图像分析的培训,将参与撰写手稿,并在区域和国家科学会议上展示数据。在我们的常规暑期教学计划中,将为科学教育研究生提供TEM技术和图像分析方面的培训。通过当地NSF REU计划的本科生将协助TEM工作和图像分析,并在当地和区域会议上进行研究。该项目支持EPSCoR州两个机构的三名研究人员,并与学术界和私营部门的CoPI建立学科和机构之间的合作。研究成果将发表在领先的国际期刊以及地方和国家专业会议上。将建立一个网站,广泛提供数据和解释。该项目具有更广泛的社会和经济影响,通过增加对早期沉积物成岩作用过程中有机质封存的认识,并了解石油源岩中原干酪根和最终干酪根的发展。
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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Kenneth Curry其他文献
Kenneth Curry的其他文献
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{{ truncateString('Kenneth Curry', 18)}}的其他基金
Collaborative Research ETBC: Combined Experimental and Theoretical Study of the Physical Mechanisms Underlying Deposition, Degradation and Preservation of Marine Organic Carbon
合作研究ETBC:海洋有机碳沉积、降解和保存物理机制的实验与理论相结合研究
- 批准号:
0930879 - 财政年份:2009
- 资助金额:
$ 18.72万 - 项目类别:
Continuing Grant
SGER: Clay Microfabric Signatures Driving Organic Matter Preservation in Marine Sediment: Micro- to Nano-scale Properties and Processes
SGER:粘土微织物特征推动海洋沉积物中有机物的保存:微米到纳米尺度的特性和过程
- 批准号:
0438079 - 财政年份:2004
- 资助金额:
$ 18.72万 - 项目类别:
Standard Grant
Photosynthesis Taught Across The Curriculum
整个课程教授光合作用
- 批准号:
9151451 - 财政年份:1991
- 资助金额:
$ 18.72万 - 项目类别:
Standard Grant
Phylogenetic Relationships of Operculate Discomycetes
有盖盘菌纲的系统发育关系
- 批准号:
8019728 - 财政年份:1981
- 资助金额:
$ 18.72万 - 项目类别:
Continuing grant
相似海外基金
Micro- and Nanofabric Protection of Organic Matter in Clay-rich Muds and Polychaete Fecal Pellets: Direct Visualization by TEM and Quantitative Analysis
微米和纳米织物对富含粘土的泥浆和多毛类粪便颗粒中有机物的保护:通过 TEM 和定量分析直接可视化
- 批准号:
0824566 - 财政年份:2008
- 资助金额:
$ 18.72万 - 项目类别:
Standard Grant