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Embryonic quail eye development in microgravity.

J E Barrett1, D C Wells, A Q Paulsen

  • 1Division of Biology, Ackert Hall, Kansas State University, Manhattan, Kansas 66506-4901, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 8, 2000
PubMed
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Japanese quail embryos developed normally in microgravity aboard the Mir space station. Eye development, including weight and diameter, showed no significant differences compared to ground controls, indicating microgravity

Area of Science:

  • Space biology
  • Developmental biology
  • Ophthalmology

Background:

  • The US-Russian joint quail embryo project investigated microgravity's effects on embryonic development.
  • Previous studies have explored spaceflight's impact on various biological systems.

Purpose of the Study:

  • To assess the impact of microgravity on Japanese quail embryo eye development.
  • To compare morphological and histological parameters of flight embryos with ground controls.

Main Methods:

  • Japanese quail embryos were incubated aboard the Mir space station (flight group) and on Earth (control groups).
  • Measurements included eye weight, eye, corneal, and scleral ring diameters, and scleral ossicle bone counts.
  • Corneal transparency, innervation (immunohistochemistry), and ultrastructure (electron microscopy) were analyzed.
Keywords:
NASA Discipline Developmental BiologyNASA Experiment Number 9306010NASA Program Fundamental Space BiologyNon-NASA Center

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Main Results:

  • Most developmental parameters, including eye weight and scleral ossicle formation, were comparable between flight and ground control embryos.
  • Corneal diameter of E16 flight embryos showed a minor difference compared to one control group.
  • Fixation methods were inadequate for preserving corneal nerves and cellular ultrastructure for detailed analysis.

Conclusions:

  • Microgravity did not significantly impede Japanese quail embryo eye development.
  • Current fixation techniques require improvement for comprehensive analysis of neuro-cellular structures in space-flown specimens.