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STABILITY OF ISOLATED MITOTIC APPARATUS DURING STORAGE.

Arthur Forer1, A M Zimmerman2

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|June 7, 2023
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Summary
This summary is machine-generated.

Researchers isolated sea urchin mitotic apparatus (MA) using different methods. Hexylene glycol isolation affected MA birefringence stability and decay, while glycerol-dimethylsulphoxide offered superior stability.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Developmental Biology

Background:

  • The mitotic apparatus (MA) is crucial for cell division.
  • Understanding the physical properties of the MA, such as birefringence, can provide insights into its structure and function.

Purpose of the Study:

  • To compare the properties of mitotic apparatus (MA) isolated using different procedures.
  • To investigate the factors influencing the birefringence and its stability in isolated MA.

Main Methods:

  • Isolation of mitotic apparatus (MA) from sea urchin zygotes using hexylene glycol and glycerol-dimethylsulphoxide (MTME) methods.
  • Measurement and comparison of MA birefringence under varying pH conditions and after extraction with H2O or 0.5 M KCl.
  • Analysis of birefringence decay rates and stability over time.

Main Results:

  • MA isolated with hexylene glycol exhibited pH-dependent birefringence, with lower pH increasing birefringence and stability.
  • MA isolated with glycerol-dimethylsulphoxide (MTME) showed significantly greater birefringence stability, with decay rates approximately 1000 times slower than those isolated with hexylene glycol.
  • Residual birefringence after extraction depended on isolation method, storage medium, and storage duration.

Conclusions:

  • The isolation method significantly impacts the birefringence properties and stability of the mitotic apparatus (MA).
  • Glycerol-dimethylsulphoxide (MTME) is a superior isolation medium for preserving MA birefringence stability.
  • Multiple components, potentially including oriented ribosomes, may contribute to the birefringence of isolated MA.