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Title: Texture Analysis of Polycrystalline Vaterite Spherulites from Lake Sturgeon Otoliths

Abstract

Fish otoliths, or ear bones, are comprised of the CaCO 3 polymorphs (aragonite, calcite and vaterite), which can occur either alone or in combination. The polymorph phase abundance in an otolith depends on, as yet, unexplained genetic and environmental factors. Most fish otoliths are comprised of the densest CaCO 3 polymorph, aragonite. Sturgeon otoliths, on the other hand, contain significant amounts of the rare and the structurally enigmatic polymorph, vaterite. Sturgeon otoliths are frequently comprised of agglomerations of small microcrystalline vaterite spherulites (<300 μm in diameter), that range in shape from nearly perfect spheres to oblate spheroids. These spherulites are similar to the synthetic vaterite microspheres employed in laser trapping applications. Vaterite spherulites from both hatchery-reared (juvenile) and wild (adult) Lake Sturgeon exhibit extreme crystallographic texture as evidenced by X-ray diffraction patterns and their reconstructed pole-figures determined here. The vaterite crystallites making up the spherulites have excellent registry in both the axial and equatorial directions. Whether synthesized or natural, the texture manifested in these spherulites suggests that vaterite nucleates and grows similarly in vivo otolith formation as well as from laboratory synthesis. The uniaxial optical character of the vaterite spherulites, confirmed by these diffraction experiments and combined with their largemore » birefringence, makes them well suited for laser trapping applications.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [3];  [4];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. University of Manitoba, Winnipeg, MB (Canada)
  4. Wisconsin Department of Natural Resources, Oshkosh, WI (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1511906
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chakoumakos, Bryan C., Pracheil, Brenda M., Wood, Robert S., Loeppky, Alison, Anderson, Gary L., Koenigs, Ryan, and Bruch, Ronald. Texture Analysis of Polycrystalline Vaterite Spherulites from Lake Sturgeon Otoliths. United States: N. p., 2019. Web. doi:10.1038/s41598-019-43434-w.
Chakoumakos, Bryan C., Pracheil, Brenda M., Wood, Robert S., Loeppky, Alison, Anderson, Gary L., Koenigs, Ryan, & Bruch, Ronald. Texture Analysis of Polycrystalline Vaterite Spherulites from Lake Sturgeon Otoliths. United States. doi:10.1038/s41598-019-43434-w.
Chakoumakos, Bryan C., Pracheil, Brenda M., Wood, Robert S., Loeppky, Alison, Anderson, Gary L., Koenigs, Ryan, and Bruch, Ronald. Thu . "Texture Analysis of Polycrystalline Vaterite Spherulites from Lake Sturgeon Otoliths". United States. doi:10.1038/s41598-019-43434-w. https://www.osti.gov/servlets/purl/1511906.
@article{osti_1511906,
title = {Texture Analysis of Polycrystalline Vaterite Spherulites from Lake Sturgeon Otoliths},
author = {Chakoumakos, Bryan C. and Pracheil, Brenda M. and Wood, Robert S. and Loeppky, Alison and Anderson, Gary L. and Koenigs, Ryan and Bruch, Ronald},
abstractNote = {Fish otoliths, or ear bones, are comprised of the CaCO3 polymorphs (aragonite, calcite and vaterite), which can occur either alone or in combination. The polymorph phase abundance in an otolith depends on, as yet, unexplained genetic and environmental factors. Most fish otoliths are comprised of the densest CaCO3 polymorph, aragonite. Sturgeon otoliths, on the other hand, contain significant amounts of the rare and the structurally enigmatic polymorph, vaterite. Sturgeon otoliths are frequently comprised of agglomerations of small microcrystalline vaterite spherulites (<300 μm in diameter), that range in shape from nearly perfect spheres to oblate spheroids. These spherulites are similar to the synthetic vaterite microspheres employed in laser trapping applications. Vaterite spherulites from both hatchery-reared (juvenile) and wild (adult) Lake Sturgeon exhibit extreme crystallographic texture as evidenced by X-ray diffraction patterns and their reconstructed pole-figures determined here. The vaterite crystallites making up the spherulites have excellent registry in both the axial and equatorial directions. Whether synthesized or natural, the texture manifested in these spherulites suggests that vaterite nucleates and grows similarly in vivo otolith formation as well as from laboratory synthesis. The uniaxial optical character of the vaterite spherulites, confirmed by these diffraction experiments and combined with their large birefringence, makes them well suited for laser trapping applications.},
doi = {10.1038/s41598-019-43434-w},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {5}
}

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Works referenced in this record:

A profile refinement method for nuclear and magnetic structures
journal, June 1969