An analysis of hydroxyapatite surface layer formation
Article Abstract:
The growth of hydroxyapatite (HAp) surface layers that are different from bulk layers have been studied. Surface layers are the result of HAp having a variable composition from Ca10(PO4)6(OH)2 to approximately Ca9HPO4(PO4)5OH. These compositions exist over Ca/P ratio from 1.67 for stoichiometric to approximately 1.5 for fully calcium-deficient HAp. The variation in the composition is that only one HAp composition dissolves congruently. Surface layers are formed when the HAp has Ca/P ratios different from the congruently dissolving compositions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
The war at home
Article Abstract:
The rights of US citizens are being violated for reasons of national security, drug control, and employment purposes. The American Civil Liberties Union reports that employees subjected to surveillance increased from 8 million to 30 million from 1990-1996.
Publication Name: Vanity Fair
Subject: General interest
ISSN: 0733-8899
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Currents
Article Abstract:
Utne Reader magazine recently sponsored a forum where a number of prominent thinkers, writers and artists gave their visions of the future. A brief overview of some of the more provocative predictions is presented.
Publication Name: Utne Reader
Subject: General interest
ISSN: 8750-0256
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Green teens. True to Blue
- Abstracts: Blurring the lines. Exploring all opportunities
- Abstracts: A port reborn. Complementarity, correspondence, and the community of the bomb
- Abstracts: Strong organs of inhabitiveness. Quarterback: a tough position to tackle
- Abstracts: How to be popular. Escalating features