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  • 1
    Electronic Resource
    Electronic Resource
    In Vitro Bio-Mineralization Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 543-546 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present work describes the development of biomimetic composites materials forbone tissue substitution and repair. At this purpose a biomimetic approach was used and apatiticphases were nucleated on macromolecular matrices like natural collagen, which act as template andinduce peculiar physico-chemical features in the mineral phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.543.pdf
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Protein Adsorption on Nanohydroxyapatites: Spectroscopic Investigations at Molecular Level (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 396-398 (Oct. 2008), p. 77-80 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Proper thermal treatments allowed to modify the number of surface Ca2+ able to coordinate water molecules on the surface of hydroxyapatite (HA) nanoparticles surrounded by an amorphous layer. Despite the consequent significant difference in the first hydration level between untreated and treated HA, the amount of adsorbed BSA, used as a model protein, remained essentially unchanged and the native structure of adsorbed protein was retained (as indicated by mid-IR ATR). Near-IR spectroscopy evidenced that adsorbed proteins should be in direct contact with surface Ca2+ through a displacement of H2O molecules by charged acidic residues. In agreement with a previous study that evidenced the heterogeneity of surface Ca2+ ions in terms of Lewis acidity, it was then proposed that the adsorption of BSA on such nano-HA should be ruled by some feature of the local structure of surface Ca2+ sites, prevailing on the total number of cationic sites exposed and the related features of the first hydration layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.396-398.77.pdf
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Development of Multisubstituted Apatites for Bone Reconstruction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 171-174 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hydroxyapatite powders characterized by substitutions of Mg2+, SiO44-, CO32- ions inbiological like amounts, in the crystallographic site of calcium and phosphates, ions in biologicallike amounts, in the crystallographic site of calcium and phosphorus, were successfully prepared bysynthesis in aqueous medium. The chemico-physical properties of the powders were investigatedthrough several analytical techniques, among them: XRD, FTIR, TG-DTA, ICP-OES, HR-TEM. Theentering of silicon in the HA structure progressively reduces its crystallinity, as also carbonate ionsdo. Silicate and carbonate ions can enter simultaneously into the HA structure, in biological-likeamounts, although they compete for the occupation of the phosphate site. Solubility tests, carriedout at physiological conditions, reveal an increased calcium release in the HA powders containingsilicon compared to the silicon-free HA
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.171.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Surface Structure, Hydration and Cationic Sites of Nanohydroxyapatite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 87-90 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, we studied the surface/water interaction properties of a pure calciumhydroxyapatite (HA) and their modifications as a consequence of the partial Ca2+/Mg2+ (MHA)substitution by means of IR spectroscopy and microcalorimetry of adsorbed water. IR dataindicated that water molecules in direct contact with the surface of HA are coordinated to surfacecations and experience H-bond significantly stronger than in liquid water. The heats of adsorptionassociated to such interactions are very high, being twice-triple the heat of liquefaction of water.Interestingly, water experiences H-bond higher than in its bulk liquid state also in the second layer.Finally the entering in the material of Mg2+ ions was shown to significantly affect the affinity of thematerial toward water and the properties of its hydration layers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.87.pdf
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    Paper (German National Licenses)
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  • 5
    facet.materialart.
    Unknown
    Ultrastructural, material and crystallographic description of endophytic masses – a possible damage response in shark and ray tessellated calcified cartilage (2017)
    Details
    Publication Date: 2022-07-19
    Description: The cartilaginous endoskeletons of Elasmobranchs (sharks and rays) are reinforced superficially by minute, mineralized tiles, called tesserae. Unlike the bony skeletons of other vertebrates, elasmobranch skeletons have limited healing capability and their tissues’ mechanisms for avoiding damage or managing it when it does occur are largely unknown. Here we describe an aberrant type of mineralized elasmobranch skeletal tissue called endophytic masses (EPMs), which grow into the uncalcified cartilage of the skeleton, but exhibit a strikingly different morphology compared to tesserae and other elasmobranch calcified tissues. We use biological and materials characterization techniques, including computed tomography, electron and light microscopy, x-ray and Raman spectroscopy and histology to characterize the morphology, ultrastructure and chemical composition of tesserae-associated EPMs in different elasmobranch species. EPMs appear to develop between and in intimate association with tesserae, but lack the lines of periodic growth and varying mineral density characteristic of tesserae. EPMs are mineral-dominated (high mineral and low organic content), comprised of birefringent bundles of large monetite or brushite crystals aligned end to end in long strings. Both Unusual skeletal mineralization in elasmobranchs tesserae and EPMs appear to develop in a type-2 collagen-based matrix, but in contrast to tesserae, all chondrocytes embedded or in contact with EPMs are dead and mineralized. The differences outlined between EPMs and tesserae demonstrate them to be distinct tissues. We discuss several possible reasons for EPM development, including tissue reinforcement, repair, and disruptions of mineralization processes, within the context of elasmobranch skeletal biology as well as descriptions of damage responses of other vertebrate mineralized tissues.
    Language: English
    Type: article , doc-type:article
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