VANADIUM K-EDGE XANES STUDY OF SOILS AND LEAF LITTER: VANADIUM SPECIATION AND CO

钒 K 边 XANES 土壤和落叶层研究：钒形态和 CO

• 批准号: 8362395
• 负责人: FRANK BLACK
• 金额: $ 0.03万
• 依托单位: STANFORD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8362395
• 关键词: Bacteria; Biological; Biological Availability; Chemicals; Data; Ecosystem; Environment; Enzymes; Funding; Grant; Metals; National Center for Research Resources; Nitrogen; Nitrogen Fixation; Nitrogenase; Plant Leaves; Principal Investigator; Radiation; Research; Research Infrastructure; Resources; Soil; Source; System; United States National Institutes of Health; Vanadium; carbon fixation; cofactor; cost; response; sample fixation; structural biology

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Carbon fixation in many ecosystems is limited by the availability of nitrogen, and N2 fixation by heterotrophic bacteria is an important source of biologically available nitrogen to terrestrial systems. An important control on nitrogen fixation in soils is the chemical speciation and bioavailability of V, Mo, and Fe because they are required metal cofactors in nitrogenase, the enzyme responsible for biological N2 fixation. Efforts to understand V cycling and bioavailability in soils is severely limited by the dearth of information on V speciation in these environments. Limited vanadium K-edge XAS data we collected recently (rapid response) at SSRL BL 4-3 demonstrated that (1) we can collect high quality XANES data even at the low V concentrations (

这个子项目是许多利用资源的研究子项目之一 由NIH/NCRR资助的中心拨款提供。子项目的主要支持 子项目的主要研究者可能是由其他来源提供的， 包括其他NIH来源。 列出的子项目总成本可能 代表子项目使用的中心基础设施的估计数量， 而不是由NCRR赠款提供给子项目或子项目工作人员的直接资金。 在许多生态系统中，碳固定受到氮的可用性的限制，并且异养细菌的N2固定是陆地系统生物可利用氮的重要来源。土壤中固氮的一个重要控制因素是V、Mo和Fe的化学形态和生物有效性，因为它们是固氮酶（负责生物固氮的酶）所需的金属辅因子。努力了解V的循环和生物有效性在土壤中是严重限制了在这些环境中的V形态的信息缺乏。我们最近在SSRL BL 4-3收集的有限钒K边XAS数据（快速响应）表明：（1）即使在低V浓度下，我们也可以收集高质量的XANES数据（