Formation of Nanosize Apatite Crystals in Sediment for Containment and Stabilization of Contaminants

The elastic constants of cortical bone are orthotropic or transversely isotropic depending on the anatomic origin of the tissue. Micromechanical models have been developed to predict anisotropic elastic properties from structural information. Many have utilized microstructural features such as osteons, cement lines and Haversian canals to model the tissue properties [1]. Others have utilized nanoscale features to model the mineralized collagen fibril [2]. Quantitative texture analysis using x-ray diffraction techniques has shown that elongated apatite crystals exhibit a preferred orientation in the longitudinal axis of the bone [3]. The orientation distribution of apatite crystals provides fundamental information influencing the anisotropy of the extracellular matrix (ECM) but has not been utilized in existing micromechanical models.

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A search for apatite crystals in the gap zone of collagen fibrils in bone using dark-field illumination

Bone ◽

10.1016/j.bone.2020.115304 ◽

2020 ◽

Vol 135 ◽

pp. 115304 ◽

Cited By ~ 4

Author(s):

H.P. Schwarcz ◽

D.M. Binkley ◽

L. Luo ◽

K. Grandfield

Keyword(s):

Dark Field ◽

Collagen Fibrils ◽

Apatite Crystals ◽

Dark Field Illumination

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DISSOLUTION MECHANISMS OF THE APATITE CRYSTALS DURING DENTAL CARIES AND BONE RESORPTION

Molecular Basis of Biological Degradative Processes ◽

10.1016/b978-0-12-092150-8.50015-1 ◽

1978 ◽

pp. 277-311 ◽

Cited By ~ 2

Author(s):

R.M. Frank ◽

J.C. Voegel

Keyword(s):

Bone Resorption ◽

Dental Caries ◽

Apatite Crystals

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Aspects of Quantitative Determination by Ion Probe of Fluorine Concentrations in Apatites

Zeitschrift für Naturforschung A ◽

10.1515/zna-1974-0610 ◽

1974 ◽

Vol 29 (6) ◽

pp. 897-900 ◽

Cited By ~ 18

Author(s):

A. Lodding ◽

J.-M. Gourgout ◽

L. G. Petersson ◽

G. Frostell

Keyword(s):

Quantitative Determination ◽

Simultaneous Recording ◽

Ion Currents ◽

Experimental Conditions ◽

Apatite Crystals ◽

Ion Probe ◽

Human Enamel ◽

Micro Analysis ◽

Secondary Ion ◽

Probe Measurements

In studies of F concentrations in apatite crystals by means of secondary ion micro-analysis, it is found that even in a sample with a known and constant F/Ca ratio the recorded ratios of the F and Ca secondary ion currents can vary widely, depending on the experimental conditions of primary bombardment. An attempt has been to explain this behaviour and to devise a way to obtain quantitative atomic F to Ca ratios independent on measuring conditions. Simultaneous recording of the mass peaks of F+, Ca+ and another matrix ion (P+ or C++) appears to offer a solution of the reproducibility problem. This is demonstrated by ion probe measurements under varied conditions in three groups of materials where the F concentrations had previously been determined by macroscopic methods: apatite crystals with about 3% F, whale teeth of about 10-1 % F, and human enamel ob about 10-2 % F.

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