Assessing the effects of carboxylated amino acids and polysaccharides on the fluid-calcite element partitioning
评估羧化氨基酸和多糖对流体-方解石元素分配的影响
基本信息
- 批准号:1536743
- 负责人:
- 金额:$ 33.08万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2015
- 资助国家:美国
- 起止时间:2015-09-15 至 2020-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Many marine organisms build elaborate skeletons and shells made of carbonate minerals. Organic molecules such as amino acids and carbohydrates play important roles in regulating the structure and texture of these carbonates. Recent studies show that certain amino acids enhance magnesium uptake in carbonates and thereby influence the overall chemical composition. It is likely that these organic molecules influence the uptake of other elements as well, though this idea has not been tested. Using carefully controlled laboratory experiments, this study will investigate the effect of organic molecules on the abundance of several trace elements in carbonates. Trace element compositions of marine biogenic carbonates are widely used as tools ("proxies") to infer the temperature and the chemistry of ancient seawater, though it is known that biological processes also influence the shell chemistry. The outcome of this study will improve the reliability of trace element proxies by providing insights into biological controls on carbonate formation. This should advance our ability to reconstruct the dynamics, biology, and chemistry of the oceans in the past, which is a key to understanding the Earth's climate system. The research outcomes should be also relevant to other areas, such as removal of toxic heavy metals from the environment, engineering of new synthetic materials for industrial purposes, and geological CO2 sequestration. Based on inorganic calcite precipitation experiments using a pH-stat system, the research team will determine if and by how much element/Ca ratios in CaCO3 and precipitation rates depend on the types and concentrations of organic molecules at a constant saturation level. The research team will also address whether such effects are due to modulation of precipitation rates (kinetic effects) or due to direct molecular/ionic interactions by performing additional experiments using a known calcite precipitation inhibitor. This project provides support for an early-career investigator as well as research opportunities for undergraduate students at the University of Hawaii, where the student population has an exceptionally diverse ethnic background.
许多海洋生物建造由碳酸盐矿物制成的精心制作的骨骼和贝壳。氨基酸和碳水化合物等有机分子在调节这些碳酸盐的结构和质地方面发挥着重要作用。最近的研究表明,某些氨基酸促进了碳酸盐对镁的吸收,从而影响了整体化学成分。这些有机分子很可能也会影响对其他元素的吸收,尽管这一想法尚未得到验证。通过精心控制的实验室实验,这项研究将调查有机分子对碳酸盐中几种微量元素丰度的影响。海洋生物成因碳酸盐的微量元素组成被广泛用作推断古海水温度和化学组成的工具(“替代物”),尽管众所周知生物过程也影响贝壳化学。这项研究的结果将通过对碳酸盐形成的生物控制提供见解,从而提高微量元素替代品的可靠性。这应该会提高我们重建过去海洋的动力学、生物和化学的能力,这是理解地球气候系统的关键。研究成果还应与其他领域相关,如从环境中去除有毒重金属、为工业目的设计新的合成材料,以及地质二氧化碳封存。基于使用pH-STAT系统的无机方解石沉淀实验,研究小组将确定CaCO3中的元素/钙比和沉淀速率是否以及在多大程度上取决于在恒定饱和水平下有机分子的类型和浓度。研究小组还将通过使用已知的方解石沉淀抑制剂进行额外的实验,研究这种影响是由于沉淀率的调节(动力学效应)还是由于直接的分子/离子相互作用。该项目为夏威夷大学的本科生提供了早期职业研究人员的支持和研究机会,该大学的学生群体具有异常多样化的种族背景。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Joji Uchikawa其他文献
Changes in calcium ion concentration as the common driver for Na, K, S, and B incorporation during inorganic calcite precipitation in Mg-free artificial seawater
在无镁人造海水中无机方解石沉淀过程中,钙离子浓度的变化是钠、钾、硫和硼掺入的共同驱动因素
- DOI:
10.1016/j.gca.2025.03.022 - 发表时间:
2025-06-01 - 期刊:
- 影响因子:5.000
- 作者:
Joji Uchikawa;Szabina Karancz;Mariëtte Wolthers;Laura Pacho;Dustin T. Harper;Donald E. Penman;Lennart J. de Nooijer;Gert-Jan Reichart;Richard E. Zeebe - 通讯作者:
Richard E. Zeebe
Sulfate and phosphate oxyanions alter B/Ca and δsup11/supB in inorganic calcite at constant pH: Crystallographic controls outweigh normal kinetic effects
硫酸盐和磷酸盐含氧阴离子在恒定 pH 下改变无机方解石中的 B/Ca 和 δ11B:晶体学控制胜过正常的动力学效应
- DOI:
10.1016/j.gca.2022.12.018 - 发表时间:
2023-02-15 - 期刊:
- 影响因子:5.000
- 作者:
Joji Uchikawa;Donald E. Penman;Dustin T. Harper;Jesse R. Farmer;James C. Zachos;Noah J. Planavsky;Richard E. Zeebe - 通讯作者:
Richard E. Zeebe
Strong and persistent mineral-specific lithium isotope fractionation: no discernable kinetic isotope effects during inorganic calcite and aragonite precipitation
强烈且持久的矿物特异性锂同位素分馏:在无机方解石和文石沉淀过程中没有可察觉的动力学同位素效应
- DOI:
10.1016/j.gca.2025.03.030 - 发表时间:
2025-05-15 - 期刊:
- 影响因子:5.000
- 作者:
Corinne Hite;Joji Uchikawa;Sambuddha Misra;I.V. Satya Chanakya;Pratyusha Chanda;Richard E. Zeebe - 通讯作者:
Richard E. Zeebe
Joji Uchikawa的其他文献
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{{ truncateString('Joji Uchikawa', 18)}}的其他基金
Collaborative Research: Calibration of Raman Spectroscopy for Calcite Saturation State in Marine Biogenic Calcification
合作研究:海洋生物钙化中方解石饱和状态的拉曼光谱校准
- 批准号:
2323221 - 财政年份:2023
- 资助金额:
$ 33.08万 - 项目类别:
Standard Grant
Ground-truthing lithium paleo-proxies: Experimental study on the Li incorporation and isotope fractionation during inorganic calcite and aragonite precipitation
真实的锂古代理:无机方解石和霰石沉淀过程中锂的掺入和同位素分馏的实验研究
- 批准号:
2001927 - 财政年份:2020
- 资助金额:
$ 33.08万 - 项目类别:
Standard Grant
Collaborative Research: Effects of sulfate on boron incorporation into calcite: Relevance and implications for foraminiferal boron isotope and B/Ca paleo-proxies.
合作研究:硫酸盐对硼掺入方解石的影响:有孔虫硼同位素和 B/Ca 古代理的相关性和影响。
- 批准号:
2024631 - 财政年份:2020
- 资助金额:
$ 33.08万 - 项目类别:
Standard Grant
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