Singlet Oxygen's Role in the Photochemical-Biochemical Degradation of Dissolved Organic Carbon

单线态氧在溶解有机碳光化学生化降解中的作用

基本信息

  • 批准号:
    0527196
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2005
  • 资助国家:
    美国
  • 起止时间:
    2005-09-15 至 2009-08-31
  • 项目状态:
    已结题

项目摘要

ABSTRACTOCE-0527196Dissolved organic matter (DOM) is the largest pool of organic carbon in aquatic ecosystems and constitutes a vital link in the global carbon cycle. Despite a large flux (ca. 2 x 1014g) of terrigenous DOM into the oceans every year, little of this material accumulates suggesting that it is rapidly decomposed. While the two main losses, photochemical and biochemical degradation, have been well studied, little work has examined the mechanisms responsible for degradation and chemical transformations, especially regarding photochemical processes.In this research project, researchers at the University of Minnesota - Twin Cities will investigate the effects of a reactive oxygen species (ROS), singlet oxygen (1O2), on the chemical composition, reactivity and bioavailability of organic matter in natural waters. This project will use Lake Superior as a study site and the goals are: (1) To characterize the changes to the chemical and optical properties of DOM when exposed to 1O2; (2) To determine the changes in lability and nutritive quality of DOM following reaction with 1O2; (3) To examine the differential microbial utilization of 1O2-reactive amino acids-histidine, tryptophan, methionine, cysteine, and tyrosine-and their 1O2 reaction products, and (4) To quantify 1O2 production rates in Lake Superior.To achieve these goals, DOM from two sources (soil and phytoplankton) and along a temporal-spatial gradient (river and offshore) will be exposed to a number of treatments including sunlight and well-defined sources of 1O2 with and without quenchers present. This study features the use of non-photochemical 1O2 sources that will enable examination of effects of 1O2 independent of sunlight. Effects on lability and chemical structure of DOM will be observed via bioassays and chemical analyses. The hypothesis that decreased microbial growth efficiency is observed in the presence of oxidized DOM, due to the reaction of 1O2 with specific amino acids present in DOM will be tested. This study is expected to be the first to demonstrate whether or not singlet oxygen is responsible for many of the changes in DOM bioavailability when it is exposed to sunlight. It will also produce some of the first measurements of singlet oxygen concentrations in large aquatic systems.In terms of broader impacts, it ic certain that microbes and photochemical processes play a central role in environmental biogeochemistry. The processes examined in this project will facilitate understanding of global dynamics such as the carbon cycle, nutrient limitation and eutrophication. This project will support a young investigator (McNeill) and is collaboration between an ecologist and a chemist. In addition, several activities in the proposed project will promote teaching and training goals including: training and education of undergraduate students and graduate students and K-12 teachers. The PIs will participate in summer undergraduate research programs directed toward minority students (through the College of Biological Sciences LSSURP Program). The PIs will also participate in a K-12 teacher-training program focused on freshwater ecology. Additionally, this project will link with the NSF-RSEC program at the University of Minnesota by fostering an existing collaboration between one of the investigators and a faculty member at a Principally Undergraduate Institution.
溶解有机物(DOM)是水生生态系统中最大的有机碳库,是全球碳循环的重要环节。 尽管有很大的通量(CA。 每年有2x 1014克的陆源DOM进入海洋,但这种物质很少积累,这表明它迅速分解。 虽然光化学和生物化学降解这两种主要的损失已经得到了很好的研究,但很少有工作研究降解和化学转化的机制,特别是关于光化学过程。在这个研究项目中,明尼苏达大学双城分校的研究人员将研究活性氧(ROS),单线态氧(1 O2)对化学组成的影响,天然沃茨中有机物的活性和生物利用度。 本项目以上级湖为研究区,主要目的是:(1)研究1O_2对DOM化学和光学性质的影响,(2)研究1O_2对DOM的不稳定性和营养品质的影响,(3)研究1O_2对DOM化学和光学性质的影响。(3)研究了不同微生物对1 O2-反应性氨基酸-组氨酸、色氨酸、蛋氨酸、半胱氨酸的利用差异,和酪氨酸-及其~ 1 O_2反应产物;(4)定量测定苏必利尔湖上级~ 1 O_2的产生速率。来自两个来源的DOM(土壤和浮游植物)和沿着时空梯度(河流和近海)将暴露于多种处理,包括阳光和明确的1 O2来源,存在和不存在猝灭剂。 这项研究的特点是使用非光化学1 O2源,这将使检查1 O2的影响独立于阳光。 通过生物测定和化学分析,观察其对DOM不稳定性和化学结构的影响。 将测试在氧化DOM存在下观察到微生物生长效率降低的假设,这是由于1 O2与DOM中存在的特定氨基酸的反应。 这项研究有望首次证明单线态氧是否是DOM生物利用度在暴露于阳光下时发生许多变化的原因。 它还将首次测量大型水生系统中的单线态氧浓度。就更广泛的影响而言,微生物和光化学过程在环境地球化学中发挥着核心作用。 本项目所研究的过程将有助于了解全球动态,如碳循环、营养限制和富营养化。 这个项目将支持一个年轻的调查员(麦克尼尔),是生态学家和化学家之间的合作。 此外,拟议项目中的几项活动将促进教学和培训目标,包括:本科生和研究生以及K-12教师的培训和教育。 PI将参加针对少数民族学生的夏季本科研究计划(通过生物科学学院LSSURP计划)。 PI还将参加以淡水生态为重点的K-12教师培训计划。 此外,该项目将与明尼苏达大学的NSF-RSEC项目联系起来,通过培养一名研究人员与一所主要本科院校的一名教师之间的现有合作。

项目成果

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Kristopher McNeill其他文献

Polymers from Plant Oils Linked by Siloxane Bonds for Programmed Depolymerization.
来自植物油的聚合物通过硅氧烷键连接进行程序解聚。
  • DOI:
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    15
  • 作者:
    Chen Cheng;Jake X Shi;Eun;Taylor F. Nelson;Michael Sander;Kristopher McNeill;John F. Hartwig
  • 通讯作者:
    John F. Hartwig
Synergistic effect of UV-A and UV-C light is traced to UV-induced damage of the transfer RNA.
UV-A 和 UV-C 光的协同效应可追溯到 UV 诱导的转移 RNA 损伤。
  • DOI:
    10.1016/j.watres.2024.121189
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    12.8
  • 作者:
    Sandra Probst;P. Nyangaresi;Adefolawe A. Adeyeye;Martin Ackermann;Sara E. Beck;Kristopher McNeill
  • 通讯作者:
    Kristopher McNeill
Marine and terrestrial contributions to atmospheric deposition fluxes of methylated arsenic species
海洋和陆地对甲基化砷物种大气沉降通量的贡献
  • DOI:
    10.1038/s41467-024-53974-z
  • 发表时间:
    2024-11-07
  • 期刊:
  • 影响因子:
    15.700
  • 作者:
    Esther S. Breuninger;Julie Tolu;Franziska Aemisegger;Iris Thurnherr;Sylvain Bouchet;Adrien Mestrot;Rachele Ossola;Kristopher McNeill;Dariya Tukhmetova;Jochen Vogl;Björn Meermann;Jeroen E. Sonke;Lenny H. E. Winkel
  • 通讯作者:
    Lenny H. E. Winkel
Photodegradation of pharmaceuticals in the aquatic environment: A review
  • DOI:
    10.1007/s00027-003-0672-7
  • 发表时间:
    2003-12-01
  • 期刊:
  • 影响因子:
    1.800
  • 作者:
    Anne L. Boreen;William A. Arnold;Kristopher McNeill
  • 通讯作者:
    Kristopher McNeill

Kristopher McNeill的其他文献

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{{ truncateString('Kristopher McNeill', 18)}}的其他基金

CAREER: Environmental Dechlorination Catalysis
职业:环境脱氯催化
  • 批准号:
    0239461
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant

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创新的纳米平台可放大单线态氧信号并揭示光子在大脑中令人费解的作用。
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创新的纳米平台可放大单线态氧信号并揭示光子在大脑中令人费解的作用。
  • 批准号:
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创新的纳米平台可放大单线态氧信号并揭示光子在大脑中令人费解的作用。
  • 批准号:
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Role of nanoparticle core size on plasmon enhanced singlet oxygen production
纳米颗粒核心尺寸对等离子体增强单线态氧产生的作用
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RUI: Collaborative Research on the Role of Singlet Molecular Oxygen in Urban Atmospheres Rich In Polycyclic Aromatic Hydrocarbons
RUI:关于单线态分子氧在富含多环芳烃的城市大气中的作用的合作研究
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单线态氧和腐殖酸毒性对浮游细菌活性和群落结构的作用
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