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Mary H. Schweitzer
North Carolina State University
74Publications
24H-index
1,783Citations
Publications 74
Newest
Published on Mar 7, 2019in BMC Evolutionary Biology 3.03
Aurore Canoville11
Estimated H-index: 11
(NCSU: North Carolina State University),
Mary H. Schweitzer24
Estimated H-index: 24
(NCSU: North Carolina State University),
Lindsay E. Zanno17
Estimated H-index: 17
(NCSU: North Carolina State University)
Background Medullary bone (MB) is an estrogen-dependent, sex-specific tissue produced by female birds during lay and inferred to be present in extinct avemetatarsalians (bird-line archosaurs). Although preliminary studies suggest that MB can be deposited within most skeletal elements, these are restricted to commercial layers or hormonally treated male pigeons, which are poor analogues for wild birds. By contrast, studies in wild bird species noted the presence of MB almost exclusively within li...
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Published on Jul 4, 2019in Proteomics 3.53
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Yanhong Pan13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences),
Wenxia Zheng10
Estimated H-index: 10
(NCSU: North Carolina State University)
+ 13 AuthorsTao Zhao1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences)
Dinosaur fossils possessing integumentary appendages of various morphologies, interpreted as feathers, have greatly enhanced our understanding of the evolutionary link between birds and dinosaurs, as well as the origins of feathers and avian flight. In extant birds, the unique expression and amino acid composition of proteins in mature feathers have been shown to determine their biomechanical properties, such as hardness, resilience, and plasticity. Here, we provide molecular and ultrastructural...
2 Citations Source Cite
Published on Dec 1, 2018in Nature 41.58
Johan Lindgren20
Estimated H-index: 20
(Lund University),
Peter Sjövall27
Estimated H-index: 27
(Research Institutes of Sweden)
+ 20 AuthorsC. Alwmark13
Estimated H-index: 13
(Lund University)
Ichthyosaurs are extinct marine reptiles that display a notable external similarity to modern toothed whales. Here we show that this resemblance is more than skin deep. We apply a multidisciplinary experimental approach to characterize the cellular and molecular composition of integumental tissues in an exceptionally preserved specimen of the Early Jurassic ichthyosaur Stenopterygius. Our analyses recovered still-flexible remnants of the original scaleless skin, which comprises morphologically d...
3 Citations Source Cite
Published on Nov 28, 2018in PLOS ONE 2.77
Mary Higby Schweitzer3
Estimated H-index: 3
(NCSU: North Carolina State University),
Wenxia Zheng10
Estimated H-index: 10
(NCSU: North Carolina State University)
+ 2 AuthorsJohan Lindgren20
Estimated H-index: 20
1 Citations Source Cite
Published on Sep 3, 2018
Brandon J. N. Long1
Estimated H-index: 1
(NCSU: North Carolina State University),
Wenxia Zheng10
Estimated H-index: 10
(NCSU: North Carolina State University)
+ 1 AuthorsHans Hallen20
Estimated H-index: 20
(NCSU: North Carolina State University)
The discovery of soft structures in dinosaur bone with the morphological and molecular characteristics of blood vessels in extant vertebrates was both surprising and controversial. Mounting evidence suggests that these soft tissues are blood vessels, their preservation driven in part by reactive oxygen species derived from hemoglobin degradation. More data are needed to support this hypothesis. Raman spectroscopy, and resonance Raman in particular, can provide detailed information as to the chem...
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Published on Dec 1, 2017in Scientific Reports 4.12
Johan Lindgren20
Estimated H-index: 20
(Lund University),
Takeo Kuriyama6
Estimated H-index: 6
(University of Hyogo)
+ 9 AuthorsNaoki Kamezaki3
Estimated H-index: 3
(Okayama University of Science)
The holotype (MHM-K2) of the Eocene cheloniine Tasbacka danica is arguably one of the best preserved juvenile fossil sea turtles on record. Notwithstanding compactional flattening, the specimen is virtually intact, comprising a fully articulated skeleton exposed in dorsal view. MHM-K2 also preserves, with great fidelity, soft tissue traces visible as a sharply delineated carbon film around the bones and marginal scutes along the edge of the carapace. Here we show that the extraordinary preservat...
3 Citations Source Cite
Published on Feb 3, 2017in Journal of Proteome Research 3.95
Elena R. Schroeter8
Estimated H-index: 8
(NCSU: North Carolina State University),
Caroline Jane DeHart8
Estimated H-index: 8
+ 5 AuthorsMary H. Schweitzer24
Estimated H-index: 24
(NCSU: North Carolina State University)
Sequence data from biomolecules such as DNA and proteins, which provide critical information for evolutionary studies, have been assumed to be forever outside the reach of dinosaur paleontology. Proteins, which are predicted to have greater longevity than DNA, have been recovered from two nonavian dinosaurs, but these results remain controversial. For proteomic data derived from extinct Mesozoic organisms to reach their greatest potential for investigating questions of phylogeny and paleobiology...
14 Citations Source Cite
Yanhong Pan13
Estimated H-index: 13
,
Wenxia Zheng10
Estimated H-index: 10
(NCSU: North Carolina State University)
+ 7 AuthorsMary H. Schweitzer24
Estimated H-index: 24
(NCSU: North Carolina State University)
Abstract Microbodies associated with feathers of both nonavian dinosaurs and early birds were first identified as bacteria but have been reinterpreted as melanosomes. Whereas melanosomes in modern feathers are always surrounded by and embedded in keratin, melanosomes embedded in keratin in fossils has not been demonstrated. Here we provide multiple independent molecular analyses of both microbodies and the associated matrix recovered from feathers of a new specimen of the basal bird Eoconfuciuso...
18 Citations Source Cite
Published on Nov 16, 2016
Alison E. Moyer7
Estimated H-index: 7
(Drexel University),
Wenxia Zheng10
Estimated H-index: 10
(NCSU: North Carolina State University),
Mary H. Schweitzer24
Estimated H-index: 24
(NCSU: North Carolina State University)
One of the most well-recognized Cretaceous fossils is Citipati osmolskae (MPC-D 100/979), an oviraptorid dinosaur discovered in brooding position on a nest of unhatched eggs. The original description refers to a thin lens of white material extending from a manus ungual, which was proposed to represent original keratinous claw sheath that, in life, would have covered it. Here, we test the hypothesis that this exceptional morphological preservation extends to the molecular level. The fossil sheath...
6 Citations Source Cite
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