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Re: Baby mammoths get CT scans (no more free pdf of paper?)

Ben Creisler

Apparently the article is no longer in open access...Weird. It was
free with the unlocked symbol when I checked the issue and downloaded
the paper earlier, and sent the email. Apologies to people who missed
the free window. Maybe it was a mistake and I blew the whistle....

On Wed, Jul 9, 2014 at 12:46 PM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> The paper is now online and in open access:
> Daniel C. Fisher, Ethan A. Shirley, Christopher D. Whalen, Zachary T.
> Calamari, Adam N. Rountrey, Alexei N. Tikhonov, Bernard Buigues,
> Frédéric Lacombat, Semyon Grigoriev, and Piotr A. Lazarev (2014)
> X-ray computed tomography of two mammoth calf mummies.
> Journal of Paleontology 88(4):664-675
> DOI: 10.1666/13-092
> http://www.bioone.org/doi/abs/10.1666/13-092
> Two female woolly mammoth neonates from permafrost in the Siberian
> Arctic are the most complete mammoth specimens known. Lyuba, found on
> the Yamal Peninsula, and Khroma, from northernmost Yakutia, died at
> ages of approximately one and two months, respectively. Both specimens
> were CT-scanned, yielding detailed information on the stage of
> development of their dentition and skeleton and insight into
> conditions associated with death. Both mammoths died after aspirating
> mud. Khroma's body was frozen soon after death, leaving her tissues in
> excellent condition, whereas Lyuba's body underwent postmortem changes
> that resulted in authigenic formation of nodules of the mineral
> vivianite associated with her cranium and within diaphyses of long
> bones. CT data provide the only comprehensive approach to mapping
> vivianite distribution. Three-dimensional modeling and measurement of
> segmented long bones permits comparison between these individuals and
> with previously recovered specimens. CT scans of long bones and foot
> bones show developmental features such as density gradients that
> reveal ossification centers. The braincase of Khroma was segmented to
> show the approximate morphology of the brain; its volume is slightly
> less (∼2,300 cm3) than that of neonate elephants (∼2,500 cm3). Lyuba's
> premaxillae are more gracile than those of Khroma, possibly a result
> of temporal and/or geographic variation but probably also reflective
> of their age difference. Segmentation of CT data and 3-D modeling
> software were used to produce models of teeth that were too complex
> for traditional molding and casting techniques.
> **
> Also, in the same issue of the Journal of Paleontology 88(4), other
> vertpaleo papers:
> http://www.bioone.org/toc/pleo/88/4
> Virtual reconstruction of endocast anatomy in early ray-finned fishes
> (Osteichthyes, Actinopterygii)
> Sam Giles and Matt Friedman
> Journal of Paleontology Jul 2014 : Vol. 88, Issue 4, pg(s) 636-651
> doi: 10.1666/13-094
> ====
> Endocranial anatomy of a new fossil porpoise (Odontoceti, Phocoenidae)
> from the Pliocene San Diego Formation of California
> Rachel A. Racicot and Timothy Rowe
> Journal of Paleontology Jul 2014 : Vol. 88, Issue 4, pg(s) 652-663
> doi: 10.1666/13-109
> ==
> Developmental paleobiology of the vertebrate skeleton
> Martin Rücklin, Philip C. J. Donoghue, John A. Cunningham, Federica
> Marone, and Marco Stampanoni
> Journal of Paleontology Jul 2014 : Vol. 88, Issue 4, pg(s) 676-683
> doi: 10.1666/13-107
> ---------- Forwarded message ----------
> From: Ben Creisler <bcreisler@gmail.com>
> Date: Wed, Jul 9, 2014 at 8:12 AM
> Subject: Baby mammoths get CT scans
> To: dinosaur@usc.edu, VRTPALEO@usc.edu
> Ben Creisler
> bcreisler@gmail.com
> The new issue of the Journal of Paleontology is apparently not online
> yet but these news stories are out about new studies of two baby
> woolly mammoths:
> http://phys.org/news/2014-07-ct-scanned-siberian-mammoth-calves-yield.html
> http://www.nbcnews.com/science/science-news/x-ray-scans-tell-tale-baby-mammoths-life-death-n150991