Hydroxylapatite, also called hydroxyapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH), but is usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two entities. Hydroxylapatite is the hydroxyl endmember of the complex apatite group. The OH- ion can be replaced by fluorid...
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http://en.wikipedia.org/wiki/Hydroxylapatite
phosphate mineral, calcium hydroxide phosphate [Ca5(PO4)3OH], that forms glassy, often green crystals and masses. It is seldom pure in nature but ... [5 related articles]
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http://www.britannica.com/eb/a-z/h/89
Synonym for hydroxyapatite ... <chemistry> The calcium phosphate mineral, Ca10(PO4)6(OH)2, found both in rocks of nonorganic origin and as a component of bone and dentine. Used as column packing for chromatography, particularly for separating double stranded DNA from mixtures containing single stranded DNA. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: hī-drok′sil-ap′ă-tīt Synonyms: hydroxyapatite
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http://www.medilexicon.com/medicaldictionary.php?t=42086
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