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keratin

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Journal Article
Journal: PALAIOS
Published: 10 October 2017
PALAIOS (2017) 32 (10): 647–657.
...EVAN T. SAITTA; CHRISTOPHER S. ROGERS; RICHARD A. BROOKER; JAKOB VINTHER Abstract: The evolution of integumentary structures, particularly in relation to feathers in dinosaurs, has become an area of intense research. Our understanding of the molecular evolution of keratin protein is greatly...
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Photomicrograph of the <b>keratin</b> epidermal layers (annuli) of turtle shell fr...
Published: 01 January 2002
Figure 20. Photomicrograph of the keratin epidermal layers (annuli) of turtle shell fragments from an individual collected at the Ash Basin site, a Se map, and Se K α XANES spectra of the epidermal layers and inorganic and organo-Se compounds (Hunter and Bertsch, unpublished).
Journal Article
Published: 14 April 2007
Canadian Journal of Earth Sciences (2007) 44 (2): 267–274.
...Hillary C. Maddin; Robert R. Reisz Abstract Morphological features of the terminal phalanges of extinct tetrapods can be used to infer whether or not keratinous claws were present even though these structures are not preserved in the fossil record. Such features as dense vascularization grooves...
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SEM images of <b>keratinous</b> filament ultrastructural deformation patterns unde...
in > PALAIOS
Published: 10 October 2017
Figure 2.— SEM images of keratinous filament ultrastructural deformation patterns under moderate maturation. A ) Fresh horse hair. B ) Moderately matured horse hair showing helical curling. C ) Fresh black feather barbs and barbules. D ) Moderately matured black feather barbules showing
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Figure  1. A, Drawing showing the arrangement of <b>keratinous</b> scales on the v...
Published: 01 January 2007
Figure 1. A, Drawing showing the arrangement of keratinous scales on the ventral surface of the plastron (bottom shell) of Emys marmorata , and the positions of the 19 landmarks used in this study. B, Ontogenetic shape change for the data set of 762 E. marmorata specimens described
Journal Article
Journal: Geology
Published: 23 September 2019
Geology (2019) 47 (11): 1049–1053.
... are diagnostic of a single biomaterial component, we find many similarities with modern biopolymers, particularly collagen, keratin, and elastin. Maintenance of significant relief following complete tearing suggests that Dickinsonia was composed of relatively thick tissues, signifying higher oxygen requirements...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP455.4
EISBN: 9781786203366
... to a line between the elbow and the wing tip. Fig. 8. Results from Figure 7 (for reinforced membranes only) recast to show the effect of membrane thickness at flight speeds of 10 and 14 m s −1 . The high modulus keratin reinforced membrane is less sensitive to the assumed thickness and can...
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Series: NRC Monograph Publishing Program
Published: 01 January 2008
EISBN: 9780660198200
... by Sampson (1995). Fig. 4. (A) Skeletal reconstruction of Pachyrhinosaurus lakustai. (B) Life reconstruction showing two possible options for keratinous coverings of the nasal and suborbital bosses. Note that Langston does not subscribe to the idea of keratinous horns. Animal on the right also...
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Journal Article
Journal: Paleobiology
Published: 01 January 2005
Paleobiology (2005) 31 (2): 291–314.
... reflect bautechnisches artifacts of growth and production of bone. Surface vascular features likely supported bone growth and remodeling, as well as the blood supply to a keratinous covering. When the gross and microstructural features of the plates and spikes are viewed in phylogenetic context, no clear...
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F igure  5. Natural cast of the pedal ungual of USNM 540686, with evidence ...
Published: 01 September 2011
F igure 5. Natural cast of the pedal ungual of USNM 540686, with evidence of a sharp keratinous ungual sheath. Scale bar = 1 cm.
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Figure  9. Three stegosaurs, restored by Greg Paul, to show variation in pl...
Published: 01 January 2005
Figure 9. Three stegosaurs, restored by Greg Paul, to show variation in plate configuration on three genera of similar size. Areas in white represent actual bony tissue extent; black silhouettes around plates and spikes represent hypothesized keratinous extent. The horizontal line along the bases
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Comparison of ornithomimid manual ungual II-3 in lateral view. (A)  Dromice...
Published: 19 October 2018
Fig. 13. Comparison of ornithomimid manual ungual II-3 in lateral view. (A) Dromiceiomimus brevitertius , UALVP 16182; (B) Ornithomimus edmontonicus , ROM 851; (C) Ornithomimus edmontonicus , TMP 1995.110.0001; (D) Struthiomimus altus , TMP 1990.026.0001. ft, flexor tubercle; kg, keratin
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FIGURE 6. Feather ultrastructure. A) Rod-shaped and ovate structures in var...
in > PALAIOS
Published: 01 June 2011
-710). E) Unidentified reticulate structure in KIS-704, which might be remnant of feather keratine. F) Transverse sections of rods in KIS-708, showing little if any distortion due to compaction but with no discernable pattern of original internal arrangement.
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TABLE 1 —Digit lengths in two tyrannosaur specimens, Field Museum of Natura...
in > PALAIOS
Published: 01 October 2008
, although the proximal end of the first phalanges would not have been in contact with the ground, a keratinous sheath would have extended the length of the digits, and a fleshy pad at the rear of the foot would have been present. Measurements for BHI 3033 were taken directly from a specimen (cast) held
Journal Article
Journal: Geology
Published: 01 October 2016
Geology (2016) 44 (10): 839–842.
... of the keratin matrix, suggesting a higher calcification of the tubules as compared to the intertubular keratin in the mysticete studied here. Based on the calcification of bristles, their diameter in the lower range of extant mysticetes, and the high baleen plate density, we propose that this middle-sized...
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Figure  2. Scutes of  Scelidosaurus  (A–C, in thin-section; scale bar, 1 mm...
Published: 01 January 2005
. D, Detail of Stegosaurus plate, USNM 7585, showing the distal edge of the plate and the grooves that run to the edge without diminishing in diameter or entering the plate. These features suggest that these grooves contained the vascular canals that supplied blood to the presumably keratinous
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Notable examples of vertebrate fossils housed at the Royal Tyrrell Museum o...
Published: 05 August 2015
Gorgosaurus libratus (TMP 1991.036.0500), a subadult individual (see Currie 2003 a ), and (G) the ostrich-mimic Ornithomimus edmontonensis (TMP 1995.110.0001), an adult that preserves remnants of a keratinous beak and evidence along its forelimb bones of shafted feathers (see Norrell et al. 2001
Series: Geological Society, London, Special Publications
Published: 01 January 2003
DOI: 10.1144/GSL.SP.2003.217.01.14
EISBN: 9781862394650
... as well as the keratinous sheaths of the claws of hand and foot are preserved ( Frey & Tischlinger 2000 ; Tischlinger & Frey 2001 ). Throat pouches, rhamphothecae, soft-tissue crests and occipital cones. Other soft parts were discovered in Pterodactylus ventral to the mandible and were...
Journal Article
Journal: Geology
Published: 01 August 2010
Geology (2010) 38 (8): 699–702.
... of shallow digs with smaller burrow complexes and larger digs with larger burrow complexes argue against egg nest scraping because of their inconsistent size. The scale and morphology of the claw impressions, left by the keratin sheath, indicate that the trace maker was a dinosaur. How much the keratin...
FIGURES
Journal Article
Published: 01 October 2019
Geochemical Perspectives (2019) 8 (2): 279–281.
..., 250, 252, 261, 264, 266-268 hydrocarbons 109, 120, 121, 144, 181, 210, 212, 235, 266 hydrogen exchange 123-125 hydrogen isotopes 117-119, 124, 127, 139, 230, 240, 246, 264-266, 272, 273 I isotope fingerprint 177 K keratin 123, 232 L Last Glacial Maximum 166 lignin 140, 145, 146, 184, 185, 262, 267...