Dr. Cindy Tribuzio Profile

Dr. Cindy Tribuzio

at Alaska Fisheries Science Ctr., NOAA Fisheries

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Proceedings Article | 14 October 2022 Presentation + Paper

Growth bands in dogfish spines

Stuart Stock, Victoria Cooley, Cindy Tribuzio, Luxi Li, Viktor Nikitin, Olga Antipova

Proceedings Volume 12242, 122420S (2022) https://doi.org/10.1117/12.2633826

KEYWORDS: Spine, Tissues, X-ray fluorescence spectroscopy, X-rays, Minerals, Signal attenuation, Zinc, Synchrotrons, Bone, Phase contrast

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Dogfish (Squalus spp.) possess one or two dorsal-fin spines located at the dorsal midline over the vertebral column. These spines are heavily mineralized, and surface bands of light and dark contrast are used in age determinations. The interior of the spine also contains growth bands visible via optical microscopy of thin sections, but the three-dimensional pattern of growth bands does not appear to have been quantitatively mapped nor has the microstructural origin of the band contrast been established. This paper reports synchrotron microComputed Tomography (microCT) results on spines of Squalus suckleyi. MicroCT was performed at beamline 2-BM of the Advanced Photon Source (APS). There are numerous parallel bands, and their contrast consists of varying (higher and lower) values of linear attenuation coefficient, similar to growth bands observed in other mineralized tissues including mammalian cementum and dentin. The microCT data are supplemented by x-ray excited x-ray fluorescence maps of a sectioned Pacific dogfish spine recorded at beamlines 8-BM and 2-ID-E, APS; of particular note are bands of high Zn content, something which has been found in growth bands in other mineralized tissues.

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