Structural characterisation of X-ray amorphous calcium carbonate (ACC) in sternal deposits of the crustacea Porcellio scaber

Becker, Alexander; Bismayer, U.; Epple, Matthias; Fabritius, Helge-Otto; Hasse, B.; Shi, Jianmin; Ziegler, Andreas

doi:10.1039/b210529b

Cited by 116 publications

(122 citation statements)

References 28 publications

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“…Previous analysis by X-ray total scattering showed that both short and medium range order are present within ACC. No correlation, however, in the pair distribution function could be found for distances greater than 10 suggesting the absence of long range order 22,23 . Ca K-edge extended X-ray absorption spectroscopy has been used to determine the first coordination shell of the calcium ion.…”

Section: Introductionmentioning

confidence: 85%

Using simulation to understand the structure and properties of hydrated amorphous calcium carbonate

et al. 2016

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We report results from studies using four different protocols to prepare hydrated amorphous calcium carbonate, ranging from random initial structures to melting hydrated mineral structures.All protocols give good agreement with experimental X-ray structure factors. However, the thermodynamic properties, ion coordination environments, and distribution of water for the structures produced by the protocols show statistically significant variation depending on the protocols used. We discuss the diffusivity of water through the various structures and its relation to experiments. We show that one protocol (based on melting ikaite) gives a structure where the water is mobile, due to the presence of porosity in the amorphous structure. We conclude that our models of hydrated amorphous calcium carbonate do give a range of behaviour that resembles that observed experimentally, although the variation is less marked in the simulations than in experiments.3

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Section: Introductionmentioning

confidence: 85%

Using simulation to understand the structure and properties of hydrated amorphous calcium carbonate

et al. 2016

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“…Previous studies have shown that ACC from sternal deposits of P. scaber is stable in methanol for at least 1 month (Becker et al, 2003). Subcuticular soft tissue was carefully removed from the tergites and the sample washed first in bidistilled water for 2 s to remove salt residues and then in 100% methanol for at least 5 s to remove the water.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Besides of its role as a transient reservoir for calcium carbonate (Becker et al, 2003;Levi-Kalisman et al, 2002;Raz et al, 2002;Ziegler, 1994) an important function of ACC in invertebrate biocomposites is its role as a precursor of crystalline calcium carbonate (Addadi et al, 2003;Beniash et al, 1997;Hasse et al, 2000;Marxen et al, 2008;Politi et al, 2004;Raz et al, 2000;Weiss et al, 2002;Weiner et al, 2005). It is of particular interest that during the mineralization of the new posterior tergites the ACC/calcite ratio decreases after an intense initial increase.…”

Section: Resorption and Storage Of Accmentioning

confidence: 99%

“…Interestingly, the mineral phase of the sternal CaCO 3 deposits of P. scaber are completely amorphous with a molar Ca:Mg ratio of 30:1 and a Ca:P ratio of 11.5:1 (Ziegler, 1994(Ziegler, , 2002Becker et al, 2003). The amorphous structure allows a quick dissolution of the deposits since ACC is about 10 times more soluble than calcite (Brecevic and Nielson, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Amorphous and crystalline calcium carbonate distribution in the tergite cuticle of moulting Porcellio scaber (Isopoda, Crustacea)

Neues

Hild

Epple

et al. 2011

Journal of Structural Biology

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a b s t r a c tThe main mineral components of the isopod cuticle consists of crystalline magnesium calcite and amorphous calcium carbonate. During moulting isopods moult first the posterior and then the anterior half of the body. In terrestrial species calcium carbonate is subject to resorption, storage and recycling in order to retain significant fractions of the mineral during the moulting cycle. We used synchrotron X-ray powder diffraction, elemental analysis and Raman spectroscopy to quantify the ACC/calcite ratio, the mineral phase distribution and the composition within the anterior and posterior tergite cuticle during eight different stages of the moulting cycle of Porcellio scaber. The results show that most of the amorphous calcium carbonate (ACC) is resorbed from the cuticle, whereas calcite remains in the old cuticle and is shed during moulting. During premoult resorption of ACC from the posterior cuticle is accompanied by an increase within the anterior tergites, and mineralization of the new posterior cuticle by resorption of mineral from the anterior cuticle. This suggests that one reason for using ACC in cuticle mineralization is to facilitate resorption and recycling of cuticular calcium carbonate. Furthermore we show that ACC precedes the formation of calcite in distal layers of the tergite cuticle.

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“…Another interesting aspect of the P. scaber model is the amorphous character of the sternal deposits (Becker et al, 2002;Ziegler, 1994). Because the solubility of amorphous CaCO3 (ACC) is ten times higher than of its crystalline form (Brecevic and Nielson, 1989), it is ideally suitable as a transient store for Ca 2+ .…”

mentioning

confidence: 99%

Expression and polarity reversal of V-type H+-ATPase during the mineralization–demineralization cycle in Porcellio scabersternal epithelial cells

Ziegler

Weihrauch

Hagedorn

et al. 2004

Journal of Experimental Biology

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Structural characterisation of X-ray amorphous calcium carbonate (ACC) in sternal deposits of the crustacea Porcellio scaber

Cited by 116 publications

References 28 publications

Using simulation to understand the structure and properties of hydrated amorphous calcium carbonate

Using simulation to understand the structure and properties of hydrated amorphous calcium carbonate

Amorphous and crystalline calcium carbonate distribution in the tergite cuticle of moulting Porcellio scaber (Isopoda, Crustacea)

Expression and polarity reversal of V-type H+-ATPase during the mineralization–demineralization cycle in Porcellio scabersternal epithelial cells

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