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Allosaurus bone healing (free pdf)

From: Ben Creisler

The Allosaurus healing paper is now available in open access. Here's
the ref and links:

Jennifer Anné, Nicholas P. Edwards, Roy A. Wogelius, Allison R.
Tumarkin-Deratzian, William I. Sellers, Arjen van Veelen, Uwe
Bergmann, Dimosthenis Sokaras, Roberto Alonso-Mori, Konstantin
Ignatyev, Victoria M. Egerton and Phillip L. Manning (2014)
Synchrotron imaging reveals bone healing and remodelling strategies in
extinct and extant vertebrates.
Journal of the Royal Society Interface 11 no. 96 20140277
doi: 10.1098/rsif.2014.0277

Free pdf:

Current understanding of bone healing and remodelling strategies in
vertebrates has traditionally relied on morphological observations
through the histological analysis of thin sections. However, chemical
analysis may also be used in such interpretations, as different
elements are known to be absorbed and used by bone for different
physiological purposes such as growth and healing. These chemical
signatures are beyond the detection limit of most laboratory-based
analytical techniques (e.g. scanning electron microscopy). However,
synchrotron rapid scanning–X-ray fluorescence (SRS–XRF) is an
elemental mapping technique that uniquely combines high sensitivity
(ppm), excellent sample resolution (20–100 µm) and the ability to scan
large specimens (decimetre scale) approximately 3000 times faster than
other mapping techniques. Here, we use SRS–XRF combined with
microfocus elemental mapping (2–20 µm) to determine the distribution
and concentration of trace elements within pathological and normal
bone of both extant and extinct archosaurs (Cathartes aura and
Allosaurus fragilis). Results reveal discrete chemical inventories
within different bone tissue types and preservation modes. Chemical
inventories also revealed detail of histological features not
observable in thin section, including fine structures within the
interface between pathological and normal bone as well as woven
texture within pathological tissue.


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