STRUCTURAL & KINETIC STUDIES OF HYDROGEN BONDING VIA SOLID STATE NMR

结构性

• 批准号: 6120843
• 负责人: LEN MUELLER
• 金额: $ 7.79万
• 依托单位: UNIVERSITY OF CALIF-LOS ALAMOS NAT LAB
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-15 至 2000-01-14
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6120843
• 关键词: biological products; biomedical resource; environmental health

The SIR provided 74% K 15 N03 containing 87.6g of isotope; 803.9g 17.5% K"N03 contining 131g of isotope; 4978.9 g 17.5% K 15 NO containing 10.4g of isotope; 4 lOg 21% of K 15 N63 continaing 186g of isotope; 2030. 1 g Improved understanding of the nitrogen cycle in estuaries is needed to help explain how anthropogenic changes in nitrogen inputs are affecting coastal systems. We propose to experimentally test conceptual and numerical models of nitrogen dynamics in an estuary by adding 15N-enriched dissolved inorganic nitrogen to the upper reaches of the Parker River-Plum Island Sound estuary, the site of an ongoing NSF-funded Land Margin Ecosystem Research (LMER) program. Previous whole-system labeling experiments in forested watersheds, lakes and rivers have demonstrated the feasibility, power and cost effectiveness of the tracer addition approach. In the Parker River-Plum Island Sound estuary, intensive measurements of the distribution of the added nitrogen tracer will yield estimates of fluxes and residence times of nitrogen in the water, food web components and sediments. The 15N addition experiment will provide information to test and refine complex models of estuarine N flow that are otherwise very difficult to validate. The product will be greatly improved understanding of the transport, transformation and fate of nitrogen in riverine saltmarsh estuaries.

SIR提供74%K15N03，含同位素87.6g; 17.5%KNO3，含131 g同位素; 4978.9 g 17.5%K15NO，含10.4g同位素; 410 g 21%的K 15 N63，含有186 g同位素; 2030. 1 g改善 需要了解河口的氮循环， 解释氮输入的人为变化如何影响 沿海系统。 我们建议实验测试概念和 河口氮动态的数值模式， 15 N富集的溶解无机氮向上游扩散， 帕克河-梅岛湾河口，一个正在进行的 NSF资助的陆地边缘生态系统研究（LMER）计划。 先前 在森林流域、湖泊和 河流已经证明了可行性，电力和成本效益 添加示踪剂的方法。 在帕克河-梅岛 健全的河口，密集测量的分布， 氮示踪剂将产生通量和停留时间的估计， 水、食物网成分和沉积物中的氮。 15N 此外，实验将提供测试和改进的信息 河口氮流的复杂模型，否则很难 来验证 对产品的了解会大大提高 氮在河流中的迁移、转化和归趋 盐沼河口