Protein-induced, previously unidentified twin form of calcite

Pokroy, Boaz; Kapon, Moshe; Marin, Frédéric; Adir, Noam; Zolotoyabko, E.

doi:10.1073/pnas.0608584104

Cited by 51 publications

(58 citation statements)

References 20 publications

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“…The lattice parameters of synthetic calcite calculated from the XRD patterns were found to be as follows: a = 4.988 Å and c = 17.08 Å; these values are in good agreement with the literature values for rhombohedral symmetry (in hexagonal axes): a = 4.991 Å and c = 17.061 Å. 32 The interplanar angle between the (001) and (104) planes calculated by using a general equation 36 based on the experimental data was found to be approximately 44.61 o . By using this value, we performed crystallographic analysis of the fabricated calcite crystals by following a previously reported method.…”

Section: Resultssupporting

confidence: 75%

“…As shown in Figure 1(a), many of the particles had cleavage faces of (104) orientation, which is a well-known crystallographic orientation in calcite and also the most thermodynamically stable face. [32][33][34] From the XRD result, however, diffraction peaks of the vaterite phase (ICSD card no: 33-0268) appeared following addition of 5 mg/mL PASP, and diffraction intensity of the calcite phase decreased, as shown in Figure 2(b). Along with the increase in PASP concentration, the gradual disappearance of diffraction peaks of calcite, along with a gradual increase of vaterite, can be seen in Figure 2(c).…”

Section: Resultsmentioning

confidence: 99%

“…By using this value, we performed crystallographic analysis of the fabricated calcite crystals by following a previously reported method. 32,33 Further, (104)-oriented twin crystals inclined at 44.62 o relative to the [001] direction and perpendicular to the (001) plane were grown. On the basis of these results, we suggest the following mechanism for the formation of calcite.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

Zhou¹,

Gao²,

Hwang³

et al. 2011

Bulletin of the Korean Chemical Society

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CaCO 3 crystalline structures having novel assemblies were in situ fabricated as analogs of naturally occurring proteins and polysaccharides for biomineralization. The calcite crystal was mineralized in a poly(vinyl alcohol)-Ca 2+ complex film immersed in a Na 2 CO 3 solution containing poly(aspartic acid). The morphology and size of the CaCO 3 crystals were tuned by varying the concentration of poly(aspartic acid). The mechanisms of their nucleation orientation and formation were investigated experimentally and through molecular dynamics (MD) simulations in order to obtain a better understanding of the interactions between the polymers and the crystal at the molecular level. Both the MD results and experimental results indicate that the interaction between PVA and calcite mainly depends on the concentration of the polymer. The novel approach proposed herein for the fabrication of inorganic crystalline assembly structures can be used to fabricate precise crystalline structures.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

Zhou¹,

Gao²,

Hwang³

et al. 2011

Bulletin of the Korean Chemical Society

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“…By definition, a twin plane results from a combination of particular crystallographic orientations in adjacent sectors and a particular orientation of the interface plane. This is illustrated with the theoretical case of the calcite twin (104), which is an established twin plane of calcite (Pokroy et al 2007). The atomic orientation of the calcite twin (104) with two adjacent sectors (blue and pink) is shown in Figure 5e.…”

Section: Interpretation Of the Sectored Sclerites: Twinning Or "Mesotmentioning

confidence: 97%

Mesoscale twinning and crystallographic registers in biominerals

Floquet

Vielzeuf

2011

American Mineralogist

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Mesocrystals attract increasing interest in the fields of physics, chemistry, materials, and Earth sciences. Yet, structural properties of this new class of solid materials are not fully described. Biominerals often display complex hierarchical mesocrystalline organizations. We report on the crystallography of sclerites, which are small (∼80 µm), beautifully shaped calcitic biomineral structures found in the living tissues of octocorals. Despite a layered concentric structure, the submicrometer crystalline units constituting the sclerites display a remarkably simple crystallographic organization of similarly oriented units with only a low degree of misorientation between them. Some sclerites display crystallographic sectors, leading to the concept of "mesotwin." A mesotwin is to a twin what a "mesocrystal" is to a crystal: an analog with defects. On the basis of EBSD data, we propose a simple conceptual crystallographic model that accounts for the observed features. This model involves different rhombohedral unit blocks, with identical shapes and volumes, but different crystallographic faces. EBSD data show that quite unexpectedly slight misorientations of crystallites in the sclerites are not at random but organized around the three equivalent a axes of the hexagonal unit cell of calcite. In a subtle way, the overall organization and morphologies of the red coral sclerites are connected to the calcite crystallography.

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“…Pokroy et al (2007) reported their discovery of a formerly unknown twin form in calcite crystals grown from solution to which a mollusc shell-derived 17-kDa protein, Caspartin, was added. This intracrystalline protein was extracted from the calcitic prisms of Pinna nobilis.…”

Section: Discussionmentioning

confidence: 99%

Variability in the crystallographic texture of bivalve nacre

Frýda¹,

Klicnarová²,

Frýdová³

et al. 2010

Bull. Geosci.

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The crystallographic texture of nacre in eleven bivalve species belonging to the superorders Opponobranchia, Pteriomorpha, and Paleoheterodonta, was studied. Our analysis confirmed a uniform orientation of the crystallographic c-axes of aragonite platelets in all the species studied, but a variable arrangement of a-and b-axes. New data suggest that the rate of alignment of a-and b-axes from girdle-like (unordered nacre) to a single crystal-like texture (ordered nacre) differs considerably among the analyzed species. Numerical evaluation of the data obtained from species with ordered nacre also revealed systematic differences in texture strength among the main crystallographic axes of aragonite platelets. The texture strength of a-axes (direction parallel to growth lines) is always weaker than that of b-and c-axes. Observed differences in shape of the growth lines on the surface of nacreous platelets, in twinning percentage as well as in rate of alignment of a-and b-axes suggest variations in nacre growth process in individual phylogenetic lineages of the Class Bivalvia. These facts may imply not only evolutionary changes in microstructure and crystallographic texture of the nacre but also in molecular mechanisms driving its production during the long molluscan evolution. • Key words: Bivalvia, nacre, crystallographic texture, phylogeny.

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Protein-induced, previously unidentified twin form of calcite

Cited by 51 publications

References 20 publications

A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

Mesoscale twinning and crystallographic registers in biominerals

Variability in the crystallographic texture of bivalve nacre

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Protein-induced, previously unidentified twin form of calcite

Cited by 51 publications

References 20 publications

A Novel Approach to Controlling CaCO3Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

A Novel Approach to Controlling CaCO3Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

Mesoscale twinning and crystallographic registers in biominerals

Variability in the crystallographic texture of bivalve nacre

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Product

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A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)

A Novel Approach to Controlling CaCO₃Crystalline Assembly by Changing the Concentration of Poly(aspartic acid)