Nucleation Theory

Mutaftschiev, B.

doi:10.1016/b978-0-444-88908-9.50010-3

Cited by 33 publications

(34 citation statements)

References 45 publications

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“…7). It is well established that the presence of a foreign substance can exert strong control over CaCO 3 nucleation because interfacial energy between a crystal nucleus and a solid substrate is often lower than that of a crystal in contact with the solution (Mutaftschiev, 1993). Once the seed is initiated within the organic matrix structure, principles governing abiotic (i.e.…”

Section: A New Conceptual Model Of Coral Biomineralisationmentioning

confidence: 99%

A new conceptual model of coral biomineralisation: hypoxia as the physiological driver of skeletal extension

Wooldridge

2013

Biogeosciences

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That corals skeletons are built of aragonite crystals with taxonomy-linked ultrastructure has been well understood since the 19th century. Yet, the way by which corals control this crystallization process remains an unsolved question. Here, I outline a new conceptual model of coral biomineralisation that endeavours to relate known skeletal features with homeostatic functions beyond traditional growth (structural) determinants. In particular, I propose that the dominant physiological driver of skeletal extension is night-time hypoxia, which is exacerbated by the respiratory oxygen demands of the coral's algal symbionts (= zooxanthellae). The model thus provides a new narrative to explain the high growth rate of symbiotic corals, by equating skeletal deposition with the "work-rate" of the coral host needed to maintain a stable and beneficial symbiosis. In this way, coral skeletons are interpreted as a continuous (long-run) recording unit of the stability and functioning of the coral–algae endosymbiosis. After providing supportive evidence for the model across multiple scales of observation, I use coral core data from the Great Barrier Reef (Australia) to highlight the disturbed nature of the symbiosis in recent decades, but suggest that its onset is consistent with a trajectory that has been followed since at least the start of the 1900s. In concluding, I outline how the proposed capacity of cnidarians (which includes modern reef corals) to overcome the metabolic limitation of hypoxia via skeletogenesis also provides a new hypothesis to explain the sudden appearance in the fossil record of calcified skeletons at the Precambrian–Cambrian transition – and the ensuing rapid appearance of most major animal phyla

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Section: A New Conceptual Model Of Coral Biomineralisationmentioning

confidence: 99%

A new conceptual model of coral biomineralisation: hypoxia as the physiological driver of skeletal extension

Wooldridge

2013

Biogeosciences

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“…Pour plus d'informations sur le sujet, le lecteur intéressé pourra consulter l'article de synthèse de B. Mutaftschiev [3] ou l'ouvrage de W. Kurz et D. J. Fisher [4]. Le phénomène clé est ici 3/33 la distribution des fluctuations de densité au sein de la phase liquide, qui permettent de donner naissance à un noyau stable.…”

Section: Formation De La Phase Solideunclassified

Croissance cristalline en phase liquide : éléments théoriques

Garandet

2003

Élaboration Et Caractérisation Des Cristaux Massifs Et en Couches Minces Pour l'Optique

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“…where u represents the number of molecules in the critical nucleus (Hofrichter, Ross & Eaton, 1974, 1976Feher & Kam, 1985;Ataka & Tanaka, 1986). A potential source of confusion is the apparent discrepancy between the power law expression and that found in physical texts on crystal growth (Mutaftschiev, 1993), which give the nu- (Hofrichter, Ross & Eaton, 1974, 1976Ataka & Tanaka, 1986). The expression favored by physicists accomodates the variation of critical radius with supersaturation.…”

Section: Qobsmentioning

confidence: 99%

A Local Approximation to Supersaturation Affords a Useful Coordinate Transformation for the Study of Crystal Growth

Carter¹

1996

Acta Cryst D

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Two of the most important experimental variables in the search for appropriate crystallization conditions are the initial concentrations of macromolecule and crystallizing agent. Previously, it has been suggested that the[macromolecule]} be used to sample crystal growth conditions. Here, it is shown that this transformation is a special case of a generally applicable transformation. The initial supersaturation can be represented locally by a rectangular hyperbola involving multiples of the product of macromolecule and crystallizing agent concentrations. The coordinate system for the solubility diagram, ([crystallizing agent] versus [macromolecule]), can thus be transformed analytically to an alternative coordinate system in which the independent variables are local approximations to the initial supersaturation and the reservoir of soluble macromolecule available to feed a growing seed. In the new coordinate system the 'nucleation zone' is 'orthogonalized', so it can be sampled efficiently on a rectangular grid, with greater assurance that experiments will give rise to crystals. Moreover, since these new coordinate directions segregate fundamental effects on nucleation from effects on growth, using them in experimental designs should improve data analysis for response surface experiments.

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Nucleation Theory

Cited by 33 publications

References 45 publications

A new conceptual model of coral biomineralisation: hypoxia as the physiological driver of skeletal extension

A new conceptual model of coral biomineralisation: hypoxia as the physiological driver of skeletal extension

Croissance cristalline en phase liquide : éléments théoriques

A Local Approximation to Supersaturation Affords a Useful Coordinate Transformation for the Study of Crystal Growth

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