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'Bones' in keywords Facet   section ZfN Section C:Volume 035  [X]
Facet   Publication Year 1980  [X]
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1Author    F.C M DriessensRequires cookie*
 Title    Probable Phase Composition of the Mineral in Bone  
 Abstract    Formulas proposed for the mineral of bone were reviewed. Literature data were collected where Ca, P, Na, Mg and C 0 3 are determined in the same samples. These data were analyzed for their conformity to the above mentioned formulas. According to this analysis Mg is contained in a phase having the Ca/P of magnesium whitlockite within the limits o f error. Na is contained in a carbonated calcium phosphate phase which in analogy with synthetic systems must have the apatite structure. The Ca/P ratio o f the remaining "rest phase" is 2. This is based on the composi­ tion of 101 bone mineral samples taken from fishes, reptiles, amphibians, birds and mammals. The C 0 3 content of the bone samples agrees with the formula Ca8 (P 0 4)4 (C 0 3) (OH)2 • x H20 for the "rest phase" within the limits of experimental error. Such a compound has, however, not been found in synthetic systems. Human bone contains about 15% magnesium whitlockite, 25% of the Na and C 0 3 containing apatite and the rest is the carbonated calcium phosphate with Ca/P = 2. It is presumed that this compound has a structure similar to that o f octo calcium phosphate and that most o f the citrate ions which always occur in bone mineral samples are in­ corporated in that phase. 
  Reference    Z. Naturforsch. 35c, 357—362 (1980); received January 15 1980 
  Published    1980 
  Keywords    Bone, Mineral, Phase Composition, Citrate 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0357.pdf 
 Identifier    ZNC-1980-35c-0357 
 Volume    35 
2Author    F.C M Dnessens, R.M H VerbeeckRequires cookie*
 Title    Evidence for Intermediate Metastable States during Equilibration of Bone and Dental Tissues  
 Abstract    Experimental data were collected on the solubility equilibrium of the mineral of bone, tooth enamel and calcium phosphate renal stones. Evaluation in the form of potential diagrams of Ca(OH) 2 versus H3P 0 4 shows that Ca/P ratios of 1, 4/3, 10/7, 3/2 and 5/3, related to phases like brushite, octocalcium phosphate, whitlockite, defective apatite and hydroxyapatite respectively can be important. These facts allow the interpretation that many of these calcium phosphates are present simultaneously in biominerals or that they are formed during the equilibration. 
  Reference    Z. Naturforsch. 35c, 262 (1980); received December 27 1979 
  Published    1980 
  Keywords    Calcium Phosphates, Solubility, Bone, Dental Enamel 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0262.pdf 
 Identifier    ZNC-1980-35c-0262 
 Volume    35