Abstract
Results of microbeam mapping (x-ray excited x-ray fluorescence and transmission x-ray diffraction) of Beluga whale cementum and of beaver dentin reveal growth bands are defined by variation in mineral content (carbonated hydroxyapatite, cAp), by variation in Zn content and by variation in cAp lattice parameter a. For both tissues, diffraction and fluorescence data show that Zn signal and a are anti-correlated, that is high Zn signal is co-located with low a, and vice versa. In cementum and bone, treatment with acid removes Ca, Zn and cAp. The data are strong evidence that Zn is incorporated into the cAp lattice in these tissues and that the amount of Zn incorporated varies across two very different types of growth bands, annual bands in Beluga cementum and daily incremental bands in beaver dentin. To the best of the authors’ knowledge, this is the first observation of spatial variation of lattice parameter within growth bands.
| Original language | English (US) |
|---|---|
| Article number | 100935 |
| Journal | Materialia |
| Volume | 14 |
| DOIs | |
| State | Published - Dec 2020 |
Funding
The authors thank Barbara Mahoney (Alaska Regional Office, National Marine Fisheries Service, NOAA) for providing the Beluga whale tooth and Greg Halder (formerly at APS) for support in data collection at 17-BM and to B. Toby for helpful discussions. Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. JR gratefully acknowledges funding from the Undergraduate Summer Research Program of the College of Science and Health at DePaul University. Only the authors had roles in the design or execution of this study, and the authors have no financial interests to report. The authors thank Barbara Mahoney (Alaska Regional Office, National Marine Fisheries Service, NOAA) for providing the Beluga whale tooth and Greg Halder (formerly at APS) for support in data collection at 17-BM and to B. Toby for helpful discussions. Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. JR gratefully acknowledges funding from the Undergraduate Summer Research Program of the College of Science and Health at DePaul University.
Keywords
- Beaver
- Beluga whale
- Cementum
- Dentin
- Lattice parameters
- Rietveld refinement
- X-ray diffraction
- X-ray fluorescence
- Zinc
ASJC Scopus subject areas
- General Materials Science