globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2012025117
论文题名:
From particle attachment to space-filling coral skeletons
作者: Sun C.-Y.; Stifler C.A.; Chopdekar R.V.; Schmidt C.A.; Parida G.; Schoeppler V.; Fordyce B.I.; Brau J.H.; Mass T.; Tambutté S.; Gilbert P.U.P.A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:48
起始页码: 30159
结束页码: 30170
语种: 英语
英文关键词: Coral skeleton formation | PEEM | spectromicroscopy | biomineral | aragonite
英文摘要: Reef-building corals and their aragonite (CaCO3) skeletons support entire reef ecosystems, yet their formation mechanism is poorly understood. Here we used synchrotron spectromicroscopy to observe the nanoscale mineralogy of fresh, forming skeletons from six species spanning all reef-forming coral morphologies: Branching, encrusting, massive, and table. In all species, hydrated and anhydrous amorphous calcium carbonate nanoparticles were precursors for skeletal growth, as previously observed in a single species. The amorphous precursors here were observed in tissue, between tissue and skeleton, and at growth fronts of the skeleton, within a low-density nano- or microporous layer varying in thickness from 7 to 20 μm. Brunauer-Emmett-Teller measurements, however, indicated that the mature skeletons at the microscale were space-filling, comparable to single crystals of geologic aragonite. Nanoparticles alone can never fill space completely, thus ion-by-ion filling must be invoked to fill interstitial pores. Such ion-by-ion diffusion and attachment may occur from the supersaturated calcifying fluid known to exist in corals, or from a dense liquid precursor, observed in synthetic systems but never in biogenic ones. Concomitant particle attachment and ion-by-ion filling was previously observed in synthetic calcite rhombohedra, but never in aragonite pseudohexagonal prisms, synthetic or biogenic, as observed here. Models for biomineral growth, isotope incorporation, and coral skeletons’ resilience to ocean warming and acidification must take into account the dual formation mechanism, including particle attachment and ion-by-ion space filling. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163919
Appears in Collections:气候变化与战略

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作者单位: Sun, C.-Y., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Stifler, C.A., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Chopdekar, R.V., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Schmidt, C.A., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Parida, G., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Schoeppler, V., B CUBE–Center for Molecular Bioengineering, Technische Universität Dresden, Dresden, 01307, Germany; Fordyce, B.I., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Brau, J.H., Department of Physics, University of Wisconsin, Madison, WI 53706, United States; Mass, T., Marine Biology Department, University of Haifa, Haifa, 31905, Israel; Tambutté, S., Marine Biology Department, Centre Scientifique de Monaco98000, Monaco; Gilbert, P.U.P.A., Department of Physics, University of Wisconsin, Madison, WI 53706, United States, Department of Chemistry, University of Wisconsin, Madison, WI 53706, United States, Department of Geoscience, University of Wisconsin, Madison, WI 53706, United States, Department of Materials Science, University of Wisconsin, Madison, WI 53706, United States

Recommended Citation:
Sun C.-Y.,Stifler C.A.,Chopdekar R.V.,et al. From particle attachment to space-filling coral skeletons[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(48)
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