Orientation patterns of aragonitic crossed-lamellar, fibrous prismatic and myostracal microstructures of modern Glycymeris shells

Crippa, Gaia; Griesshaber, Erika; Checa, António; Harper, Elizabeth M.; Roda, María Simonet; Schmahl, Wolfgang W.

doi:10.1016/j.jsb.2020.107653

Cited by 37 publications

(30 citation statements)

References 73 publications

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“…Crystal competition has been reported in biomineral aggregates ( Crippa et al., 2020 ; Goetz et al., 2009 ; Rodríguez-Navarro and García-Ruiz, 2000 ) and was invoked also in the shell of Argonauta hians based on an increase of the EBSD-determined multiple of uniform distribution (MUD) values (which are a measure of crystal co-orientation; see method details ) with growth (e.g., Stevens et al., 2017 ). Nevertheless, direct crystal contact (i.e., competition) is not expected since the calcite crystals are confined within the organic membranes.…”

Section: Resultsmentioning

confidence: 98%

The argonaut constructs its shell via physical self-organization and coordinated cell sensorial activity

et al. 2021

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Summary The shell of the cephalopod Argonauta consists of two layers of fibers that elongate perpendicular to the shell surfaces. Fibers have a high-Mg calcitic core sheathed by thin organic membranes (>100 nm) and configurate a polygonal network in cross section. Their evolution has been studied by serial sectioning with electron microscopy-associated techniques. During growth, fibers with small cross-sectional areas shrink, whereas those with large sections widen. It is proposed that fibers evolve as an emulsion between the fluid precursors of both the mineral and organic phases. When polygons reach big cross-sectional areas, they become subdivided by new membranes. To explain both the continuation of the pattern and the subdivision process, the living cells from the mineralizing tissue must perform contact recognition of the previously formed pattern and subsequent secretion at sub-micron scale. Accordingly, the fabrication of the argonaut shell proceeds by physical self-organization together with direct cellular activity.

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Section: Resultsmentioning

confidence: 98%

The argonaut constructs its shell via physical self-organization and coordinated cell sensorial activity

et al. 2021

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“…This figure gives the full measurement of the two subsets presented in Fig. 17 in Crippa et al [1] .…”

Section: Electron Backscattered Diffractionmentioning

confidence: 99%

“…Here, we provide the dataset associated with the research article "Orientation patterns of aragonitic crossed-lamellar, fibrous prismatic and myostracal microstructures of modern Glycymeris shells" [1]. Based on several tools (SEM, EBSD, laser confocal microscopy and FE-SEM) we present original data relative to the microstructure and texture of aragonite crystallites in all Glycymeris shell layers (crossed-lamellar, complex crossed-lamellar, fibrous prismatic and pedal retractor and adductor myostraca) and address texture characteristics at the transition from one layer to the other, identifying similarities and differences among the different layers.…”

Section: Introductionmentioning

confidence: 99%

“…Fig.6. EBSD band contrast image and pole figure in a transversely cut shell [Cut A; MPUM 11860 (GIa, Glycymeris nummaria )] depicting microstructural characteristics at the transition from complex crossed-lamellar to crossed-lamellar layers (see also Fig.5in Crippa et al[1] ). The white star indicates a block of second-order lamellae.…”

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confidence: 99%

“…The following features are visible: i) the sequence of second-order lamellae (dashed lines in A) within the two sets of first-order lamellae; ii) the transfer of aragonite orientation from the crossed-lamellar shell to the adjacent myostracum; iii) the preservation of crystal morphologies and hierarchical organization of the hard materials; iv) the increase in crystallite size towards inner myostracal surfaces. This figure gives the full measurement of the two subsets presented in Fig.17in Crippa et al[1] .…”

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SEM, EBSD, laser confocal microscopy and FE-SEM data from modern Glycymeris shell layers

Crippa¹

2020

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Physical Phenomena Governing Mineral Morphogenesis in Molluscan Nacre

Gránásy,

Rátkai,

Zlotnikov

et al. 2023

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Mollusks, as well as many other living organisms, have the ability to shape mineral crystals into unconventional morphologies and to assemble them into complex functional mineral–organic structures, an observation that inspired tremendous research efforts in scientific and technological domains. Despite these, a biochemical toolkit that accounts for the formation of the vast variety of the observed mineral morphologies cannot be identified yet. Herein, phase‐field modeling of molluscan nacre formation, an intensively studied biomineralization process, is used to identify key physical parameters that govern mineral morphogenesis. Manipulating such parameters, various nacre properties ranging from the morphology of a single mineral building block to that of the entire nacreous assembly are reproduced. The results support the hypothesis that the control over mineral morphogenesis in mineralized tissues happens via regulating the physico‐chemical environment, in which biomineralization occurs: the organic content manipulates the geometric and thermodynamic boundary conditions, which in turn, determine the process of growth and the form of the biomineral phase. The approach developed here has the potential of providing explicit guidelines for the morphogenetic control of synthetically formed composite materials.

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Orientation patterns of aragonitic crossed-lamellar, fibrous prismatic and myostracal microstructures of modern Glycymeris shells

Cited by 37 publications

References 73 publications

The argonaut constructs its shell via physical self-organization and coordinated cell sensorial activity

The argonaut constructs its shell via physical self-organization and coordinated cell sensorial activity

SEM, EBSD, laser confocal microscopy and FE-SEM data from modern Glycymeris shell layers

Physical Phenomena Governing Mineral Morphogenesis in Molluscan Nacre

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