Collaborative Research: The Unintended Ecological Consequences of Nanomaterials: Effects of nanotitania in benthic systems

合作研究：纳米材料的意外生态后果：纳米二氧化钛对底栖系统的影响

• 批准号: 1067751
• 负责人: Kimberly Gray
• 金额: $ 35.75万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-01 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1067751&HistoricalAwards=false
• 关键词: Collaborative; Research; Unintended; Ecological; Consequences

1067751/1067439Gray/KellySociety is seeing the rapid transition of nanotechnology as it moves from discovery to commercialization. This revolution in atomic and molecular engineering promises many environmental and human health benefits such as dramatic improvements in efficiency, reduced resource use and waste production, and astounding improvements in medical diagnostics and therapeutics. Yet, the risks posed by nanotechnology to ecological and environmental health have not been rigorously assessed, and without these data a meaningful regulatory framework to protect human and environmental health and safety and guide the development of nanomaterials cannot be formulated. The defining characteristic of nanomaterials (NMs) is their size (at least one dimension of 100 nm or less), which falls into a transitional zone between individual atoms and molecules, and bulk materials. The small sizes, novel shapes, and high surface areas promote unusual and novel physicochemical properties to NMs and make possible nearly infinite possibilities for surface functionalization, targeted reactivity and robust material development. These very features, however, open unimagined opportunity for engineering, scientific and medical applications may also pose threats to human health and ecosystem integrity. At this time it is virtually impossible to make predictions about NM environmental fate and impact. Subtle changes in size, shape and surface functionality have profound effects on chemical and physical behavior. Furthermore, the protocols to screen and then, interrogate systems at the mechanistic level and to determine dose effects rigorously are lacking. The purpose of the proposed research is to study fundamental interactions of a representative nanomaterial (various forms of nanotitania) in biological and environmental systems at increasing scale, from subcellular through ecosystem, in order to develop a testing and measurement strategy that comprehensively characterizes the ecotoxicity of nano-scaled TiO2. The applicants propose a three-year collaborative research project that involves environmental engineers and scientists from Northwestern University (NU) and ecologists Loyola University of Chicago (LUC). This project combines the unique capabilities of nanomaterial synthesis and characterization that exist at NU with those at LUC in the field of ecology that will allow us to elucidate the effects of NM on the structure and function of benthic ecosystems. The proposed work is based on a long running collaboration among NU and LUC researchers and will be performed in novel experimental facilities well adapted to interrogating NM effects in biological systems at multiple scales. In view of the collaborative strengths and established infrastructure surrounding this project, the intellectual merit of the proposed study promises to make critical advances in understanding the relationships between NM characteristics, environmental fate and biological consequence and to probe the mechanistic basis for ecosystem responses to NM exposure. With the ability to synthesize state-of-the-art TiO2 NMs that are currently the more widely used nanoscale materials and are likely to be used even more extensively in the future, this research will improve the characterization of the environmental, health and safety aspects of NM by detailing the physical and chemical properties of the nanotitania under study. This will be accomplished by measuring the fate, transport and environmental stability of NM under relevant conditions, and conducting ecotoxicological testing at multiple scales. The broader impacts of the results of this study will not only inform the systematic evaluation of NM health and safety and serve as a model for developing the necessary scientific basis for meaningful policy formulation, but they will also illustrate a strategy to supply critical feedback to the design and production of environmentally-safe NMs. This research promises transformative insights that parallel the technology revolution of nanotechnology, itself and will help to guide NM development along routes of reduced ecotoxicity. They propose to move beyond the identification of biomarkers associated with single component responses (e.g., reactive oxygen species) to discover meaningful NM definitions based on properties not simply size and bioindicators that signal complex chemical and biological interactions at the system level. The results of this research will illustrate the feasibility of comprehensive ecotoxicological testing, but will also reveal the extent to which screening results are predictive of system level response. The broader impacts of this proposed collaborative research are also strongly connected to education at the pre-college, undergraduate, graduate and post-graduate levels, as well as to community level outreach. The research team will promote interdisciplinary exchange among ecologists, environmental engineers, molecular biologists and analytical chemists. Both NU and LUC have strong commitments to undergraduate education and actively involve undergrads in research. A strong mentoring environment exists at both NU and LUC and will nurture the scientific development of a diverse team of students.

随着纳米技术从发现到商业化的发展，社会正在见证纳米技术的快速转型。原子和分子工程的这场革命给环境和人类健康带来了许多好处，比如效率的显著提高、资源使用和废物产生的减少，以及医疗诊断和治疗方法的惊人改进。然而，纳米技术对生态和环境健康构成的风险尚未得到严格评估，如果没有这些数据，就无法制定有意义的监管框架，以保护人类和环境健康与安全，并指导纳米材料的开发。纳米材料（NMs）的定义特征是它们的尺寸（至少100纳米或更小的一个维度），它落在单个原子和分子之间的过渡区，和块状材料。小尺寸、新颖的形状和高表面积促进了纳米材料不同寻常和新颖的物理化学性质，并为表面功能化、靶向反应性和强大的材料开发提供了几乎无限的可能性。然而，正是这些特点为工程、科学和医学应用提供了难以想象的机会，也可能对人类健康和生态系统的完整性构成威胁。目前，对NM的环境命运和影响进行预测几乎是不可能的。尺寸、形状和表面功能的细微变化对化学和物理行为有深远的影响。此外，还缺乏在机制水平上筛选然后询问系统并严格确定剂量效应的方案。本研究的目的是研究具有代表性的纳米材料（各种形式的纳米二氧化钛）在生物和环境系统中从亚细胞到生态系统的基本相互作用，以开发一种全面表征纳米二氧化钛生态毒性的测试和测量策略。申请者提出了一个为期三年的合作研究项目，包括来自西北大学（NU）的环境工程师和科学家以及芝加哥洛约拉大学（LUC）的生态学家。该项目结合了南京大学和北京大学在生态学领域纳米材料合成和表征方面的独特能力，将使我们能够阐明纳米对底栖生态系统结构和功能的影响。拟议的工作是基于北大和中大研究人员之间的长期合作，并将在新的实验设施中进行，这些实验设施非常适合在多个尺度上询问生物系统中的纳米效应。鉴于围绕该项目的合作优势和已建立的基础设施，拟议研究的智力价值有望在理解纳米特征、环境命运和生物后果之间的关系方面取得关键进展，并探索生态系统对纳米暴露反应的机制基础。二氧化钛纳米材料是目前应用最广泛的纳米材料，未来可能会得到更广泛的应用。本研究将通过详细描述所研究的纳米二氧化钛的物理和化学性质，改善纳米材料在环境、健康和安全方面的表征。这将通过测量NM在相关条件下的命运、迁移和环境稳定性，并进行多尺度的生态毒理学测试来完成。本研究结果的广泛影响不仅将为纳米健康和安全的系统评估提供信息，并为有意义的政策制定提供必要的科学基础模型，而且还将阐明为环境安全纳米的设计和生产提供关键反馈的策略。这项研究有望带来与纳米技术革命平行的革命性见解，并将有助于指导纳米沿着降低生态毒性的路线发展。他们建议超越与单一组分反应（例如，活性氧）相关的生物标志物的识别，以发现基于性质的有意义的纳米定义，而不仅仅是大小和生物指标，这些生物指标表明在系统水平上复杂的化学和生物相互作用。这项研究的结果将说明综合生态毒理学测试的可行性，但也将揭示筛选结果预测系统级反应的程度。这项拟议的合作研究的更广泛影响也与大学预科、本科、研究生和研究生水平的教育以及社区层面的推广密切相关。该研究团队将促进生态学家、环境工程师、分子生物学家和分析化学家之间的跨学科交流。北大和中国大学都对本科生教育有着坚定的承诺，并积极让本科生参与研究。北大和中国大学都有良好的师徒环境，将培养一支多元化学生队伍的科学发展。