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The Crystallization of Amorphous Calcium Carbonate is Kinetically Governed by Ion Impurities and Water
2018
Advanced Science
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transient ACC"), which later transforms into a more crystalline form (calcite or aragonite) or as a stabilized phase ("stable ACC") sometimes coexisting with crystalline polymorphs. [9, 10] Biogenic ACCs are known to be stabilized by organic, and inorganic additives and when confined in space. [9, [11] [12] [13] [14] [15] However, despite extensive research, it is still not fully understood how they are stabilized and what are the mechanisms that control their crystallization. [9] The
doi:10.1002/advs.201701000
pmid:29876222
pmcid:PMC5980180
fatcat:3bahozt7cbgnrn2mrnloe26wkm
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... " of ACC has been investigated as it is expected to affect its stabilization and exhibits short-and medium-range order (SRO and MRO) up to 10 Å. [16] [17] [18] Species-specific SRO (up to 4 Å) around the Ca 2+ -ion were identified using Ca K-edge X-ray absorption spectroscopy [11, [19] [20] [21] [22] in different biogenic ACCs and a correlation was found between their SRO and their stability. Moreover, anhydrous transient ACCs showed similar shortrange structure to that of the final polymorph. [22, 23] Alternatively, it was also suggested that the phase identified as prestructured ACC is in fact poorly ordered calcite nanocrystals. [24, 25] In sea urchin larval spicules, [26, 27] as well as in gastropod shell nacre, [28] a transformation mechanism from hydrated ACC via a short-lived anhydrous ACC to the final polymorph was suggested where the crystalline phase propagates via secondary nucleation from one domain to its neighbor. The energetics of this process was later deduced as a favorable downhill sequence by calorimetric analysis of both biogenic and synthetic ACCs. [29] Secondary nucleation of ACC nanoparticles were also observed in vitro, [26, 30] where the ACC precursor was transiently stabilized by organic and inorganic additives. Gal et al. [30] suggested a crystallization mechanism by particle accretion involving partial dissolution-re-precipitation and solid-state rearrangement. This process is one case of crystallization by particle attachment mechanisms recently reviewed by De Yoreo et al. [10] The heterogeneity of biogenic minerals introduces difficulties in interpreting the mechanistic details of the stabilization and transformation of ACC, specifically when the precursor phases and the end products are intermixed at a nanometric scale. Therefore, synthetic ACC has been extensively studied as a model system. [18, 29, [31] [32] [33] [34] [35] [36] As their biogenic counterparts, synthetic ACCs present S/MRO up to 10 Å that are different [17, [33] [34] [35] or similar [33, 37] to the one of the crystalline phases of CaCO 3 . In Many organisms use amorphous calcium carbonate (ACC) and control its stability by various additives and water; however, the underlying mechanisms are yet unclear. Here, the effect of water and inorganic additives commonly found in biology on the dynamics of the structure of ACC during crystallization and on the energetics of this process is studied. Total X-ray scattering and pair distribution function analysis show that the short-and mediumrange order of all studied ACC samples are similar; however, the use of in situ methodologies allow the observation of small structural modifications that are otherwise easily overlooked. Isothermal calorimetric coupled with microgravimetric measurements show that the presence of Mg 2+ and of PO 4 3− in ACC retards the crystallization whereas increased water content accelerates the transformation. The enthalpy of ACC with respect to calcite appears, however, independent of the additive concentration but decreases with water content. Surprisingly, the enthalpic contribution of water is compensated for by an equal and opposite entropic term leading to a net independence of ACC thermodynamic stability on its hydration level. Together, these results point toward a kinetic stabilization effect of inorganic additives and water, and may contribute to the understanding of the biological control of mineral stability. Calcium Carbonate
Dynamic 23Na MRI - A non-invasive window on neuroglial-vascular mechanisms underlying brain function
2019
NeuroImage
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The research leading to these results received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement (PCOFUND-GA ...
doi:10.1016/j.neuroimage.2018.09.071
fatcat:nkhgcgwtlrhcfkm5yxmauwzk4e
Epidermal cell surface structure and chitin-protein co-assembly determine fiber architecture in the Locust cuticle
[article]
2019
bioRxiv
pre-print
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SummaryThe geometrical similarity of helicoidal fiber arrangement in many biological fibrous extracellular matrices, such as bone, plant cell wall or arthropod cuticle, to that of cholesteric liquid mesophases has led to the hypothesis that they may form passively through a mesophase precursor rather than by direct cellular control. In search of direct evidence to support or refute this hypothesis, here, we studied the process of cuticle formation in the tibia of the migratory locust, Locusta
doi:10.1101/793992
fatcat:54ybx3vr5rfa5ddabokzmfxiui
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... gratoria, where daily growth layers arise by the deposition of fiber arrangements alternating between unidirectional and helicoidal structures. Using FIB/SEM volume imaging and scanning X-ray scattering, we show that the epidermal cells determine an initial fiber orientation from which the final architecture emerges by the self-organized co-assembly of chitin and proteins. Fiber orientation in the locust cuticle is therefore determined by both active and passive processes.
Additives Control the Stability of Amorphous Calcium Carbonate via Two Different Mechanisms: Surface Adsorption versus Bulk Incorporation
2020
Advanced Functional Materials
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The mechanisms by which organisms control the stability of amorphous calcium carbonate (ACC) are yet not fully understood. Previous studies have shown that the intrinsic properties of ACC and its environment are critical in determining ACC stability. Here, the question, what is the effect of bulk incorporation versus surface adsorption of additives on the stability of synthetic ACC, is addressed. Using a wide range of in situ characterization techniques, it is shown that surface adsorption of
doi:10.1002/adfm.202000003
fatcat:vgcuunsb3vbuzoycizddrxue34
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... ly(Aspartic acid) (pAsp) has a much larger stabilization effect than bulk incorporation of pAsp and only 1.5% pAsp could dramatically increase the crystallization temperature from 141 to 350 °C. On the contrary, surface adsorption of PO 4 3− ions and OH − ions does not effectively stabilize ACC. However, bulk incorporation of these ions could significantly improve the ACC stability. It is concluded that the stabilization mechanism of pAsp is entirely different from that of PO 4 3− and OH − ions: while pAsp is effectively inhibiting calcite nucleation at the surface of ACC particle, the latter acts to modify the ion mobility and delay crystal propagation. Thus, new insights on controlling the stability and crystallization processes of metastable amorphous materials are provided.
Growth and regrowth of adult sea urchin spines involve hydrated and anhydrous amorphous calcium carbonate precursors
2019
Journal of Structural Biology: X
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In various mineralizing marine organisms, calcite or aragonite crystals form through the initial deposition of amorphous calcium carbonate (ACC) phases with different hydration levels. Using X-ray PhotoEmission Electron spectroMicroscopy (X-PEEM), ACCs with varied spectroscopic signatures were previously identified. In particular, ACC type I and II were recognized in embryonic sea urchin spicules. ACC type I was assigned to hydrated ACC based on spectral similarity with synthetic hydrated ACC.
doi:10.1016/j.yjsbx.2019.100004
pmid:32647811
pmcid:PMC7337052
fatcat:f3ggfi7ee5c2dmst7lugvpsjz4
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... owever, the identity of ACC type II has never been unequivocally determined experimentally. In the present study we show that synthetic anhydrous ACC and ACC type II identified here in sea urchin spines, have similar Ca L 2,3-edge spectra. Moreover, using X-PEEM chemical mapping, we revealed the presence of ACC-H2O and anhydrous ACC in growing stereom and septa regions of sea urchin spines, supporting their role as precursor phases in both structures. However, the distribution and the abundance of the two ACC phases differ substantially between the two growing structures, suggesting a variation in the crystal growth mechanism; in particular, ACC dehydration, in the two-step reaction ACC-H2O → ACC → calcite, presents different kinetics, which are proposed to be controlled biologically.
Page 405 of National Union Catalog Vol. 13, Issue
[page]
1942
National Union Catalog
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ng Jacques, font author, u Title, m rite: Ansoctations “aécla tees.
29-12315
Library of Congress 2
405
Bertinetti
Bertin, Théodore Pierre 1751 1s1¥.
‘ami des Bourbons. ...
Petite histoire des voyages; poésies de Marcelle Bertin, images de Denise Mary. ,Paris, Gallimard (1935,
30, p. illus (part col.) 19225". (On cover: Albums du gai sa- voir. 2)
1. ...
Page 17 of The Journal of American History Vol. 26-35, Issue CUMULATIVE INDEX
[page]
1939
The Journal of American History
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XXVI, 109-11
Benson, Jared, quoted, XX XV, 77
Benson, Mary S., revs.. ...
Under 4 Flags,
noted, XXXIII, 363
Bertinetti, Eugenia P., claim against govt.,
XXXII, 201
Beston, Henry, St. ...
Inventaire de la bibliothèque de Sony Labou Tansi
2003
Etudes littéraires africaines
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de respirer suivi du registre d'activités 1979-80 (cahier bleu cartonné)
17) Notes et croquis de mise en scène (cahier cartonné de luxe)
18) Une vie en arbre et en Chars Bonds
19)
ADIAFFI Jean-Marie ...
P] Oswald BENEDETTO André, Saint-Feniant et Dame Paresse, Actes Sud BENEDETTO André, Carnaval-Express, Editions Provence BENN, 72 dessins prémonitoires, Editions Terre d'Europe (dédicacé avec dessin) BERTINETTI ...
doi:10.7202/1041670ar
fatcat:4zkvoy5lmng3rkjgha52gtdi4i
Page 511 of Psychological Abstracts Vol. 59, Issue 2
[page]
1978
Psychological Abstracts
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., 2919 Belfie, Mary J., 3814
Bell, Philip, 3115
Bellack, Alan S., 3278 Bellingham,, W. P., 2661 Bellur, S. N., 2919 Bender, Bruce G., 2573 Bender, M. ...
W., 3201
Berry, John C., 4164 Berry, Maureen, 3495 Berry, Maurie M., 3116 Berstein, Marcos, 3716 Bertelsen, A., 3500 Bertelsen, Aksel, 3539 Bertinetti, Joseph F., 2375 Besing, Steven, 2420
Bess, James ...
Who's for the trench – Are you my laddie? La «scoperta» inglese della guerra
2016
Revista de Historiografía
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Kipling ne illustra le conseguenze in un formidabile e spiazzante racconto, Mary Postgate 7 , pubblicato nel marzo del 1915. ...
Il giovane Wynn, al quale Mary, zitella di mezza età, ha fatto quasi da madre, è morto durante un'esercitazione aerea all'inizio della guerra. ...
doi:10.20318/revhisto.2016.3094
fatcat:jdzvwcfj2bgdbm3ekmxfx2jl3m
Some Remarks on the Entry of Bona Dea into the African Provinces, with a Glance at the Italic Documentation
2021
Antiquités Africaines
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Mari Z. 2012, “Il santuario rurale della Bona Dea a San Gregorio di Sassola (RM)”, in E. ...
For an example in which the identity of the goddess is confirmed by the dedicatory inscription ( CIL, XIV 2251 = EDR137776): Bertinetti, Candilio 2013. ...
doi:10.4000/antafr.4024
fatcat:mklmzuyejne7ln6zyztbvo62xq
Publications 2015
2016
Méthodos
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Saarbrücken, Novas Edições Acadêmicas, p. 601-631. -« Unidades Fraseológicas e Ensino de Língua Estrangeira: Algumas Reflexões em Torno das Expressões Idiomáticas e dos Provérbios », in Osório, P. & Bertinetti ...
-(avec Marie-Aude Lefer), « N-grams in multilingual corpora: extracting and analyzing lexical bundles in contrastive studies », EUROPHRAS 2015 . ...
doi:10.4000/methodos.4554
fatcat:pzxmagbwzbfm3l3klfu7aqylba
Théologie
2003
Nouvelle revue théologique
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Bertinetti, R. ...
Il reprend à son compte la formule discutée: «par Marie à Jésus» et, avec Montfort, nous invite à «vivre par Marie, en Marie, avec Marie et pour Marie», car elle représente le modèle de l'Église et nous ...
doi:10.3917/nrt.254.0636
fatcat:narzghyblrdb7m6m54uw5utw4e
Bone Mineral Quality
[chapter]
2012
Osteoporosis
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Besides the effect of Sr 2+ on bone cells (stimulating bone formation and decreasing bone resorption) (Grynpas & Marie 1990; Marie et al., 1993) , the presence of Sr 2+ is shown in the bone mineral formed ...
Moreover, it was shown that apatites enriched with Mg 2+ retain more water at their surface than Mg 2+ -free apatites (Bertinetti et al., 2009) . ...
doi:10.5772/29091
fatcat:7ltpfte4vzhv3aosm2r62qaoru
Effects of tissue fixation and dehydration on tendon collagen nanostructure
2017
Journal of Structural Biology
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These increases in variation are most likely caused by increased internal 7 strains as a result of drying (Bertinetti et al., 2015; Masic et al., 2015). ...
18/21 Funding from Academy of Finland (project 286091), the strategic funding of University of 1 Eastern Finland, Swedish Foundation for Strategic Research, Marie Curie Intra-European 2 Fellowship for ...
doi:10.1016/j.jsb.2017.07.009
pmid:28760694
fatcat:3ub6w3ytt5grxjfivstcauct2i
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