Sheet nacre growth mechanism: a Voronoi model

Rousseau, Marthe; Lopez, Évelyne; Couté, Alain; Mascarel, Gérard; Smith, David; Naslain, R.; Bourrat, Xavier

doi:10.1016/j.jsb.2004.09.005

Cited by 87 publications

(82 citation statements)

References 11 publications

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“…This luminescence may be due to several organic compounds: those carrying chromophores or fluorescent groups (Bell et al 2002), organics with amide I groups (Schachar & Solin 1975) or cellulose and lignins in Permian fossil wood (Witke et al 2004). In bivalves, a high luminescence was recorded in the shell nacre nucleus of Pinctada margarifera (Rousseau et al 2005). In the outer layer, the luminescence might be caused by the presence of the pigmentation or by the occurrence of organic components, which are specific to the composite prismatic layer.…”

Section: Discussionmentioning

confidence: 99%

“…Polyenes are polyunsaturated long carbon chains of the alkene type, i. . In bivalves, a high luminescence was recorded in the shell nacre nucleus of Pinctada margarifera (Rousseau et al 2005). In the outer layer, the luminescence might be caused by the presence of the pigmentation or by the occurrence of organic components, which are specific to the composite prismatic layer.…”

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confidence: 99%

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Mineral phase in shell repair of Manila clam Venerupis philippinarum affected by brown ring disease

Trinkler¹,

Bardeau²,

Marin³

et al. 2011

Dis. Aquat. Org.

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The mineral phase of shell repair in the Manila clam Venerupis philippinarum affected by brown ring disease (BRD) was characterised at various scales and at various stages of shell repair by confocal Raman microspectrometry and scanning electron microscopy. Spherulitic and quadrangular aragonite microstructures associated with polyene pigments were clearly observed. Von Kossa staining showed that at the beginning of shell repair, hemocytes are filled with insoluble calcium carbonate salts in all fluids and then are transported toward the extrapallial fluids and the repair sites. Our analyses suggest that after a Vibrio tapetis attack and BRD deposit some clams rapidly cover the deposit, resulting in a modification in the microstructure, which could be produced by the participation of both the mantle and hemocytes.KEY WORDS: Aragonite · Hemocytes · Shell microstructure · Calcium carbonate · Biomineralization · Mollusc · Raman microspectrometry · Scanning electron microscopy Resale or republication not permitted without written consent of the publisherDis Aquat Org 93: 149-162, 2011149-162, al. 1989149-162, , Flassch et al. 1992. Landeda was the first Manila clam production site in France (Paillard et al. 1989, Flassch et al. 1992.Vibrio tapetis colonises the periostracum and inhibits the normal process of shell biomineralisation. The external response of the clam to the bacterial attack consists of a secretion of a brown organic matrix on the inner face of the shell, the well-known 'brown ring'. Immunological or PCR studies on the different physiological fluids of the clam have shown that, at later stages of the infection, V. tapetis invades the circulatory system (hemolymph) and the extrapallial fluids (Allam 1998, Allam et al. 2002, Paillard et al. 2006. At this advanced stage, clams often die from a hemolymphatic septicaemia. In some cases, clams recover by secreting a white shell layer on the brown organic matrix (Paillard & Maes 1995a,b). The bulk organic matrix associated with the shell repair has been recently characterised using Raman microspectrometry, wavelength-dispersive spectrometry (WDS) microprobe analysis and organic matrix quantification (Trinkler et al. 2009(Trinkler et al. , 2010a. However, the mineral phase and the microstructure of repaired Manila clam shells, including those that exhibit a fully repaired shell, have not yet been studied. In the present study, experimental investigations have been performed on the microstructure and the nature of the calcium carbonate repair layer, using Raman microspectrometry and scanning electron microscopy (SEM). In particular, Raman microspectrometry, a nondestructive and noninvasive technique, provides qualitative and quantitative information on organomineral composites (Urmos et al. 1991, Kontoyannis & Vagenas 2000, Withnall et al. 2003, Hedegaard et al. 2006, Carteret et al. 2009). A complementary characterisation using the Von Kossa stain, which is a stain specific for insoluble calcium salts, was performed on hemolymph and extrapallia...

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Mineral phase in shell repair of Manila clam Venerupis philippinarum affected by brown ring disease

Trinkler¹,

Bardeau²,

Marin³

et al. 2011

Dis. Aquat. Org.

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“…Insofar, these complex mineral systems are intensely investigated. An important recent finding is that several Biominerals turned out to be mesocrystals like sea urchin spines, [41,52,53] sponge spicules, [54] foraminifera, [41] nacre, [20,41,[55][56][57][58] calcite prisms in mussel shells, [59] corals, [41] or egg shells [41] as summarized by Oaki et al [41] and for calcareous sponge spicules by Sethman and Worheide. [60] Due to the complexity of biomineral systems and the difficulty to observe structure formation starting on the nanoscale in living systems, not much is known yet about the formation mechanisms of mesocrystals in biominerals.…”

Section: Mesocrystals In Bio-and Biomimetic Mineralizationmentioning

confidence: 99%

Mesocrystals—Ordered Nanoparticle Superstructures

2010

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Mesocrystals are 3D ordered nanoparticle superstructures, often with internal porosity, which receive much recent research interest. While more and more mesocrystal systems are found in biomineralization or synthesized, their potential as material still needs to be explored. It needs to be revealed, which new chemical and physical properties arise from the mesocrystal structure, or how they change by the ordered aggregation of nanoparticles to fully exploit the promising potential of mesocrystals. Also, the mechanisms for mesocrystal synthesis need to be explored to adapt it to a wide class of materials. The last three years have seen remarkable progress, which is summarized here. Also potential future directions of this reaserch field are discussed. This shows the importance of mesocrystals not only for the field of materials research and allows the appliction of mesocrystals in advanced materials synthesis or property improvement of existing materials. It also outlines attractive research directions in this field.

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“…Hence the growth surface is made of many conical structures. The preferential growth in the c-axis [001] direction and uniform crystallographic orientation are reportedly controlled by charge interactions and specific proteins [16,20,29,[38][39][40][41][42][43][44].…”

Section: Biomineralizationmentioning

confidence: 99%

The toughening mechanism of nacre and structural materials inspired by nacre

Kakisawa

Sumitomo²

2011

Science and Technology of Advanced Materials

137

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The structure and the toughening mechanism of nacre have been the subject of intensive research over the last 30 years. This interest originates from nacre's excellent combination of strength, stiffness and toughness, despite its high, for a biological material, volume fraction of inorganic phase, typically 95%. Owing to the improvement of nanoscale measurement and observation techniques, significant progress has been made during the last decade in understanding the mechanical properties of nacre. The structure, microscopic deformation behavior and toughening mechanism on the order of nanometers have been investigated, and the importance of hierarchical structure in nacre has been recognized. This research has led to the fabrication of multilayer composites and films inspired by nacre with a layer thickness below 1 µm. Some of these materials reproduce the inorganic/organic interaction and hierarchical structure beyond mere morphology mimicking. In the first part of this review, we focus on the hierarchical architecture, macroscopic and microscopic deformation and fracture behavior, as well as toughening mechanisms in nacre. Then we summarize recent progress in the fabrication of materials inspired by nacre taking into consideration its mechanical properties.

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Sheet nacre growth mechanism: a Voronoi model

Cited by 87 publications

References 11 publications

Mineral phase in shell repair of Manila clam Venerupis philippinarum affected by brown ring disease

Mineral phase in shell repair of Manila clam Venerupis philippinarum affected by brown ring disease

Mesocrystals—Ordered Nanoparticle Superstructures

The toughening mechanism of nacre and structural materials inspired by nacre

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