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Self-oriented Assembly of Nano-apatite Particles: a Subunit Mechanism for Building Biological Mineral Crystals

Division of Oral Biology, Leeds Dental Institute, University of Leeds, Clarendon Way, Leeds University LS2 9LU, UK; C.Robinson{at}leeds.ac.uk

View larger version (273K): [in this window] [in a new window]   Figure 1. Images of developing rat enamel obtained by freeze-etching. (a) TEM of replica of freeze-etched developing rat enamel, early secretory stage. No fractured crystals were seen, but spherical collinear structures are visible (long arrow), and random (cross-sections) spherical units are visible (short arrow). Reprinted with permission from Robinson et al.(1981). (b) High magnification showing co-linear arrangement of spherical (~ 30 nm) units (long arrow) and smaller (~ 5 nm units) (short arrow).

View larger version (86K): [in this window] [in a new window]   Figure 2. Atomic Force Microscope images of apatite crystals from developing rat enamel. Scale bars represent 50 nm. (a) AFM height image (paler areas are closer to the observer than darker areas) in air of rat enamel crystals from the early secretory stage. Regular swellings can be seen, reminiscent of the spheres seen in Fig. 1 (long arrows). (b) AFM height image under fluid, pH 6, of rat enamel crystals from the early maturation stage. Regular subunits can be seen corresponding to the swellings seen in height images in Fig. 2a and Fig. 1 (long arrows). Grooves between subunits produced by selective acid dissolution at junctions between subunits can also be seen (short arrow).

Journal of Dental Research, Vol. 86, No. 8, 677-679 (2007)
DOI: 10.1177/154405910708600801


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