The Microobial Nitrogen Pump: Coupling 14C and Compound-specific Amino Acids to Understand the Role of Microbial Transformations in the Refractory Ocean DON Pool

微生物氮泵：耦合 14C 和化合物特异性氨基酸以了解难降解海洋 DON 池中微生物转化的作用

• 批准号: 1358041
• 负责人: Matthew McCarthy
• 金额: $ 60万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2018-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1358041&HistoricalAwards=false
• 关键词: Microobial; Nitrogen; Pump; Coupling; 14C

Dissolved organic nitrogen is one of the most important - but perhaps least understood - components of the modern ocean nitrogen cycle. While dissolved organic nitrogen represents a main active reservoir of fixed and seemingly biologically-available nitrogen, at the same time most of ocean's dissolved organic nitrogen pool is also apparently unavailable for use by organisms. Recently, the idea of the "Microbial Carbon Pump" has emerged, providing a renewed focus on microbes as primary agents for the formation of biologically-available dissolved material. However, the role that microbes play in transformation of biologically-available dissolved organic nitrogen is still lacking. In order to fill gaps in this knowledge, researchers from the University of California Santa Cruz will apply a series of new analytical approaches to test the role of microbial source and transformation in formation of the ocean's biologically-available dissolved organic nitrogen pool. Results from this study will address one of the major unknowns of both chemical oceanography and the ocean nitrogen cycle.Broader Impacts:This proposal will provide oceanographers new tools to test ideas of microbial organic matter sequestration in a world where the oceans are rapidly changing. High school, undergraduate, graduate and post-doctoral education will be furthered through active participation in lab, field, and data synthesis activities.

溶解的有机氮是现代海洋氮循环中最重要但最重要的组成部分之一。虽然溶解的有机氮代表了固定且看似生物学上可用的氮的主要活性储层，但与此同时，大多数海洋溶解的有机氮池显然也不可用。最近，“微生物碳泵”的想法已经出现，为微生物作为形成生物学上可溶解材料的主要药物提供了重新关注。但是，仍然缺乏微生物在生物学上溶解的有机氮转化中所起的作用。为了填补这一知识的空白，加利福尼亚大学圣克鲁斯分校的研究人员将采用一系列新的分析方法来测试微生物源的作用和转化在海洋生物学上可溶解的有机氮池的形成中。这项研究的结果将介绍化学海洋学和海洋氮周期的主要未知数之一。BOODER的影响：该提案将为海洋学家提供新的工具，以测试海洋正在快速变化的世界中微生物有机物隔离的想法。高中，本科，研究生和博士后教育将通过积极参与实验室，现场和数据综合活动来进一步进一步。