Collaborative Research: Defining the Role of Biologically Produced Reactive Oxygen Species in Dark Mercury Cycling

合作研究：定义生物产生的活性氧在暗汞循环中的作用

基本信息

批准号：
1355720
负责人：
Colleen Hansel
金额：
$ 71.02万
依托单位：
Woods Hole Oceanographic Institution
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：
2014-02-01 至 2019-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1355720&HistoricalAwards=false
关键词：
Collaborative Research Defining Role Biologically

项目摘要

Mercury (Hg) is a toxic trace element that bioaccumulates into marine food webs, imposing a health threat to humans through the consumption of seafood. However, controls on the cycling of Hg in the ocean are poorly understood. Most research to date has focused on sun-lit and/or Hg-laden environments, where light-induced chemical and mercury resistance reactions, respectively, have been identified as dominant pathways for Hg cycling. The paradigm that dark Hg reactions are irrelevant is fading and it is now apparent that dark redox reactions, both reduction and oxidation, are important in the cycling of Hg. In this study, researchers at the Woods Hole Oceanographic Institution and Colorado School of Mines will obtain a better understanding of the biogeochemical reactions responsible for dark redox transformations of mercury (Hg) in marine systems. The researchers will explore the relationship between microbial activity, reactive oxygen species, and Hg speciation in a series of laboratory- and field-based investigations to obtain a mechanistic understanding of dark Hg cycling. By identifying new controls on the redox cycling of Hg in the ocean, this research will help inform global and ecosystem models used to predict Hg bioavailability.Broader Impacts: The proponents plan to educate high school teachers from Boston Green Academy in South Boston on mercury biogeochemistry and have one teacher participate in the summer research cruises, as well as develop science curricula to engage the underrepresented students at the school in science. One postdoc and one graduate student from Woods Hole Oceanographic Institution and one graduate student from the Colorado School of Mines would be supported and trained as part of this project. It is anticipated that undergraduate students would have the opportunity to participate in the study as summer interns.

汞（HG）是一种有毒的痕量元素，它将生物积累成海洋食品网，通过食用海鲜对人类构成健康威胁。但是，对海洋中HG骑自行车的控制知之甚少。迄今为止，大多数研究都集中在阳光和/或hg的环境上，在这些环境中，光诱导的化学和汞反应分别已被确定为HG循环的主要途径。深Hg反应无关紧要的范式是褪色的，现在很明显，还原和氧化的深色氧化还原反应在HG的循环中很重要。在这项研究中，伍兹孔海洋学机构和科罗拉多州矿山学校的研究人员将更好地了解海洋系统中导致汞深氧化物转化（HG）的生物地球化学反应。研究人员将在一系列基于实验室和现场的研究中探索微生物活性，活性氧和HG形成之间的关系，以获得对深Hg循环的机械理解。 By identifying new controls on the redox cycling of Hg in the ocean, this research will help inform global and ecosystem models used to predict Hg bioavailability.Broader Impacts: The proponents plan to educate high school teachers from Boston Green Academy in South Boston on mercury biogeochemistry and have one teacher participate in the summer research cruises, as well as develop science curricula to engage the underrepresented students at the school in 科学。该项目的一部分将支持和培训一名来自伍兹孔海洋学机构的博士后和一名研究生，一名来自科罗拉多州矿业学院的研究生将得到支持和培训。预计本科生将有机会参加暑期实习生。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The Spatial and Temporal Variability of Mn Speciation in the Coastal Northwest Atlantic Ocean

西北大西洋沿岸锰形态的时空变化

DOI：
10.1029/2019jc015167
发表时间：
2020
期刊：
Journal of Geophysical Research: Oceans
影响因子：
0
作者：
Oldham, V. E.;Lamborg, C. H.;Hansel, C. M.
通讯作者：
Hansel, C. M.

Tight Regulation of Extracellular Superoxide Points to Its Vital Role in the Physiology of the Globally Relevant Roseobacter Clade

DOI：
10.1128/mbio.02668-18
发表时间：
2019-03-01
期刊：
MBIO
影响因子：
6.4
作者：
Hansel, Colleen M.;Diaz, Julia M.;Plummer, Sydney
通讯作者：
Plummer, Sydney

Dark biological superoxide production as a significant flux and sink of marine dissolved oxygen

DOI：
10.1073/pnas.1912313117
发表时间：
2020-02-18
期刊：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
影响因子：
11.1
作者：
Sutherland, Kevin M.;Wankel, Scott D.;Hansel, Colleen M.
通讯作者：
Hansel, Colleen M.

Dynamic Regulation of Extracellular Superoxide Production by the Coccolithophore Emiliania huxleyi (CCMP 374)

球石藻细胞外超氧化物产生的动态调节（CCMP 374）

DOI：
10.3389/fmicb.2019.01546
发表时间：
2019
期刊：
Frontiers in Microbiology
影响因子：
5.2
作者：
Plummer, Sydney;Taylor, Alexander E.;Harvey, Elizabeth L.;Hansel, Colleen M.;Diaz, Julia M.
通讯作者：
Diaz, Julia M.

Extracellular superoxide production by key microbes in the global ocean