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  • 1
    Electronic Resource
    Electronic Resource
    Thermal instability in synthetic hydroxyapatites (1975)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 79 (1975), S. 2017-2019 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100586a007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies in the basic mineralizing system, CaO-P2O5-H2O (1974)
    Springer
    Calcified tissue international 14 (1974), S. 3-14 
    Details
    ISSN: 1432-0827
    Keywords: Hydroxyapatite ; Mineral ; Phase ; Chemistry ; Synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des diagrammes de phase d'équilibre ont été déterminés pour le système CaO-P2O5-H2O en utilisant des techniques de synthèse hydrothermique au cours de variatio nsde température allant de 300–600° et 2 Kb H2O de pression. De l'hydroxyapatite bien cristallisé a été synthétisé et caractérisé. De faibles variations de paramètres de la maille cristalline, liées à la température de synthèse et composition globale du matériel initial, ont été déterminées. Des conditions chimiques précises sont nécessaires pour obtenir de l'apatite, en tant que seule phase solide en équilibre dans la solution. Les résultats de diagramme de phase d'équilibre sont comparés avec ceux obtenus dans des milieux synthétiques.
    Abstract: Zusammenfassung Es wurden Gleichgewichts-Phasendiagramme für das System CaO-P2O5-H2O bestimmt, indem hydrothermale Synthese-Techniken im Temperaturbereich von 300–600° und bei einem Druck von 2 Kb H2O verwendet wurden. Es wurde gut-kristallisiertes Hydroxyapatit erzeugt und charakterisiert. Es wurden geringe Unterschiede in den Parametern der Zelleinheiten festgestellt, welche von der angewandten Temperatur und der Zusammensetzung des Startmaterials abhingen. Es waren genaue chemische Bedingungen nötig, um Apatit als die einzige feste Phase im Gleichgewicht mit der Lösung zu erhalten. Die Resultate der Gleichgewichts-Phasendiagramme werden mit früheren Untersuchungen mit der Synthesetechnik verglichen.
    Notes: Abstract Equilibrium phase diagrams have been determined for the system CaO-P2O5-H2 using hydrothermal synthesis techniques in the temperature range 300–600° and 2 Kb H2O pressure. Well-crystallized hydroxyapatite has been produced and characterized. Small variations in unit cell parameters dependent on temperature of synthesis and bulk composition of the starting materials have been determined. Precise chemical conditions were required to obtain apatite as the only solid phase in equilibrium with solution. Equilibrium phase diagram results are compared with previous synthetic investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060279
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of the mineral phase of bone using ethylenediamine extraction (1972)
    Springer
    Calcified tissue international 10 (1972), S. 257-268 
    Details
    ISSN: 1432-0827
    Keywords: Bone ; Hydroxyapatite ; Anorganic tissue ; Ethylenediamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Une méthode efficace et détaillée d'extraction de la matière minérale du tissu osseux à l'aide d'un appareil Soxhlet et d'éthylène diamine anhydre (ED), est décrite. L'éthylène diamine solubilise la portion organique (graisse et protéine) du tissu avec peu ou pas de modifications chimiques ou physiques de la phase minérale. Après traitement à l'éthylène diamine, la pièce est lavée à l'eau froide pour éliminer le solvant. La diffraction aux rayons X, la densité, les analyses chimiques et des études d'échange ont été utilisées pour étudier les modifications de la phase minérale pendant les procédés d'extraction et de lavage.
    Abstract: Zusammenfassung Eine detaillierte, wirksame Methode wird dargelegt, mit welcher aus Knochengewebe die Mineralsubstanz mit Hilfe eines Soxhlet-Apparates mittels wasserfreiem Äthylendiamin extrahiert werden kann. Das Äthylendiamin löst den organischen Anteil — Fett und Protein — des Gewebes mit geringer oder überhaupt keiner chemischen oder physikalischen Veränderung der Mineral phase. Nach der Behandlung mit Äthylendiamin wird die Probe mit kaltem Wasser gewaschen, um das Lösungsmittel zu entfernen. Röntgen-Diffraktion, Dichte, chemische Analyse und Austausch-Studien wurden verwendet, um Veränderungen in der Mineralsubstanz während der Extraktions- und Waschvorgänge zu überwachen.
    Notes: Abstract A detailed, efficient method of extracting mineral matter from bone tissue using a Soxhlet apparatus and anhydrous ethylenediamine is presented. The ethylenediamine solubilizes the organic portion, fat and protein, of the tissue with minor, if any, chemical or physical alteration of the mineral phase. After ethylenediamine treatment the sample is washed with cold water to eliminate the solvent. X-ray diffraction, density and chemical analyses and exchange studies have been used to monitor changes within the mineral matter during the extraction and washing procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02012557
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Studies of otoconia in the developing chick by polarized light microscopy (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 174 (1985), S. 131-144 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Using polarized light microscopy we were able to observe the mineralization patterns of embryonic and neonatal chick otoconia. We compared preparations of freshly dissected material spread under mineral oil to material that had been treated with various fixatives and dehydration agents. We found that the standard fixation agent, glutaraldehyde, and some immersion oils etche embryonic chick otoconia but that fixation with 70% acetone or 70% alcohol followed by dehydration to 100% acetone or 100% alcohol left the otoconia intact. The size and shape of freshly dissected chick otoconia observed with polarized light microscopy were similar to those of acetone-fixed, critical-point-dried material examined by SEM. Embryonic forms of otoconia were found to have a fluted pattern that was different in morphology from otoconia found in hatched chicks and adults. Embryonic chick otoconia did not exhibit the multifaceted surface morphology seen in embryonic rat otoconia. Comparisons of the same fields of otoconia under phase contrast microscopy and polarized light microscopy indicated that the freshly dissected otoconia of embryos exhibit little or no unmineralized (nonbirefringent) material but that glutaraldehyde-fixed otoconia exhibited unmineralized areas where etching had occurred. Size frequency distributions of freshly dissected embryonic and mature otoconia in five ages of embryos and hatched chicks were consistent with a hypothesized developmental sequence of otoconia.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001740204
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    Paper (German National Licenses)
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