Reply to: Characterizing coral skeleton mineralogy with Raman spectroscopy

Akiva, Anat; Neder, Maayan; Kahil, Keren; Gavriel, Rotem; Pinkas, Iddo; Goobes, Gil; Mass, Tali

doi:10.1038/s41467-018-07602-2

Cited by 7 publications

(5 citation statements)

References 8 publications

(14 reference statements)

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“…[27,[35][36][37][38] This methodology is analogous to calcification mechanisms in many organisms, where it is now recognized that calcite and aragonite biominerals often form via the transformation of an ACC precursor phase. [39][40][41][42] This strategy was first employed using track-etched membranes as templates, where ACC was stabilized using a low temperature (4 °C) rather than soluble additives. [35,36] Calcite single crystals that replicated the shape of the pores were only achieved when ACC entirely filled the pores prior to crystallization, where this was dependent on the pore size.…”

Section: Controlling Crystal Morphologiesmentioning

confidence: 99%

Crystallization in Confinement

2020

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Many crystallization processes of great importance, including frost heave, biomineralization, the synthesis of nanomaterials, and scale formation, occur in small volumes rather than bulk solution. Here, the influence of confinement on crystallization processes is described, drawing together information from fields as diverse as bioinspired mineralization, templating, pharmaceuticals, colloidal crystallization, and geochemistry. Experiments are principally conducted within confining systems that offer well‐defined environments, varying from droplets in microfluidic devices, to cylindrical pores in filtration membranes, to nanoporous glasses and carbon nanotubes. Dramatic effects are observed, including a stabilization of metastable polymorphs, a depression of freezing points, and the formation of crystals with preferred orientations, modified morphologies, and even structures not seen in bulk. Confinement is also shown to influence crystallization processes over length scales ranging from the atomic to hundreds of micrometers, and to originate from a wide range of mechanisms. The development of an enhanced understanding of the influence of confinement on crystal nucleation and growth will not only provide superior insight into crystallization processes in many real‐world environments, but will also enable this phenomenon to be used to control crystallization in applications including nanomaterial synthesis, heavy metal remediation, and the prevention of weathering.

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Section: Controlling Crystal Morphologiesmentioning

confidence: 99%

Crystallization in Confinement

2020

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“…Although the ACCto-aragonite transformation could introduce complexity into the interpretation of geochemical proxies recorded in coral skeletons, one would still expect the geochemistry of the aragonite skeleton to reflect conditions at the site of calcification and, to some extent, seawater, since the transformation of ACC to aragonite may occur within the high-pH and high- extracellular coral calcifying fluid where nucleating aragonite crystals are observed [e.g., (24)] and involve dissolution and reprecipitation of the ACC in that fluid (25). However, the role of ACC in coral calcification is an ongoing debate (23,(26)(27)(28) and, like the potential role of organic molecules in coral calcification, does not materially affect interpretation of the present study.…”

Section: Background On Scleractinian Coral Biomineralizationmentioning

confidence: 99%

Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry

et al. 2021

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The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure calcifying fluid pH (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2 conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (Ωcf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation—the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification.

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“…This work covers that lack of information with a comparative in vitro study of the influence of SOMs from B. europea and L. pruvoti on the kinetics of precipitation of aragonite. The aragonite was precipitated in ASW, which closely mimics the sea water media from which the deposition of aragonite in corals takes place . Experiments were carried out by setting either the higher supersaturation conditions that enable spontaneous precipitation of new crystals, or lower supersaturations that enable only crystal growth on already present aragonite seed.…”

Section: Discussionmentioning

confidence: 86%

In Vitro Coral Biomineralization under Relevant Aragonite Supersaturation Conditions

Džakula

Fermani

Dubinsky

et al. 2019

Chemistry A European J

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The biomineralization of corals occurs under conditions of high and low supersaturation with respect to aragonite, which corresponds to day‐ or night‐time periods of their growth, respectively. Here, in vitro precipitation of aragonite in artificial seawater was investigated at a high supersaturation, allowing spontaneous nucleation and growth, as well as at low supersaturation conditions, which allowed only the crystal growth on the deliberately introduced aragonite seeds. In either chemical systems, soluble organic matrix (SOM) extracted from Balanophyllia europaea (light sensitive) or Leptopsammia pruvoti (light insensitive) was added. The analyses of the kinetic and thermodynamic data of aragonite precipitation and microscopic observations showed that, at high supersaturation, the SOMs increased the induction time, did not affect the growth rate and were incorporated within aggregates of nanoparticles. At low supersaturation, the SOMs affected the aggregation of overgrowing crystalline units and did not substantially change the growth rate. On the basis of the obtained results we can infer that at high supersaturation conditions the formation of nanoparticles, which is typically observed in the skeleton's early mineralization zone may occur, whereas at low supersaturation the overgrowth on prismatic seeds observed in the skeleton fiber zone is a predominant process. In conclusion, this research brings insight on coral skeletogenesis bridging physicochemical (supersaturation) and biological (role of SOM) models of coral biomineralization and provides a source of inspiration for the precipitation of composite materials under different conditions of supersaturation.

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Reply to: Characterizing coral skeleton mineralogy with Raman spectroscopy

Cited by 7 publications

References 8 publications

Crystallization in Confinement

Crystallization in Confinement

Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry

In Vitro Coral Biomineralization under Relevant Aragonite Supersaturation Conditions

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