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Mary H. Schweitzer
North Carolina State University
90Publications
25H-index
2,179Citations
Publications 90
Newest
#1Aurore Canoville (NCSU: North Carolina State University)H-Index: 11
#2Mary H. Schweitzer (NCSU: North Carolina State University)H-Index: 25
Last.Lindsay E. Zanno (NCSU: North Carolina State University)H-Index: 17
view all 3 authors...
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 limb bones, s...
1 CitationsSource
#1Elizabeth M. Boatman (Wake Forest University)
#2Mark B. Goodwin (University of California, Berkeley)H-Index: 18
Last.Mary H. SchweitzerH-Index: 25
view all 7 authors...
The idea that original soft tissue structures and the native structural proteins comprising them can persist across geological time is controversial, in part because rigorous and testable mechanisms that can occur under natural conditions, resulting in such preservation, have not been well defined. Here, we evaluate two non-enzymatic structural protein crosslinking mechanisms, Fenton chemistry and glycation, for their possible contribution to the preservation of blood vessel structures recovered...
Source
#1Alida M. Bailleul (CAS: Chinese Academy of Sciences)H-Index: 8
#2Jingmai K. O’Connor (CAS: Chinese Academy of Sciences)H-Index: 26
Last.Mary H. SchweitzerH-Index: 25
view all 3 authors...
Source
#1Elena R. Schroeter (NCSU: North Carolina State University)H-Index: 9
#2Kevin Blackburn (NCSU: North Carolina State University)H-Index: 12
Last.Mary H. Schweitzer (NCSU: North Carolina State University)H-Index: 25
view all 4 authors...
Humic substances are breakdown products of decaying organic matter that co-extract with proteins from fossils. These substances are difficult to separate from proteins in solution and interfere wit...
Source
#1Elena R. SchroeterH-Index: 9
#2Kevin BlackburnH-Index: 12
Last.Mary H. SchweitzerH-Index: 25
view all 4 authors...
Source
#1Mary H. SchweitzerH-Index: 25
#2Elena R. Schroeter (NCSU: North Carolina State University)H-Index: 9
Last.Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
view all 4 authors...
Molecular studies have contributed greatly to our understanding of evolutionary processes that act upon virtually every aspect of living organisms. However, these studies are limited with regard to extinct organisms, particularly those from the Mesozoic because fossils pose unique challenges to molecular workflows, and because prevailing wisdom suggests no endogenous molecular components can persist into deep time. Here, the power and potential of a molecular approach to Mesozoic fossils is disc...
1 CitationsSource
#1Yanhong Pan (CAS: Chinese Academy of Sciences)H-Index: 13
#2Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
Last.Mary H. Schweitzer (NCSU: North Carolina State University)H-Index: 25
view all 16 authors...
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...
8 CitationsSource
#1Johan Lindgren (Lund University)H-Index: 22
#2Peter Sjövall (Research Institutes of Sweden)H-Index: 27
Last.Mary H. Schweitzer (NCSU: North Carolina State University)H-Index: 25
view all 23 authors...
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...
12 CitationsSource
#1Mary H. Schweitzer (NCSU: North Carolina State University)H-Index: 25
#2Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
Last.Johan Lindgren (Lund University)H-Index: 22
view all 5 authors...
Multiple fossil discoveries and taphonomic experiments have established the durability of keratin. The utility and specificity of antibodies to identify keratin peptides has also been established, both in extant feathers under varying treatment conditions, and in feathers from extinct organisms. Here, we show localization of feather-keratin antibodies to control and heat-treated feathers, testifying to the repeatability of initial data supporting the preservation potential of keratin. We then sh...
2 CitationsSource
#1Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
#2Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
Last.Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
view all 4 authors...
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...
1 CitationsSource
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