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Related Experiment Videos

Aerotaxis in Desulfovibrio.

A Eschemann1, M Kühl, H Cypionka

  • 1Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Germany.

Environmental Microbiology
|February 24, 2001
PubMed
Summary

Sulphate-reducing bacteria form ring-shaped bands in oxygen gradients, demonstrating aerotaxis. This behavior efficiently removes oxygen when electron donors and high cell density are present.

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Chemotaxis

Background:

  • Sulphate-reducing bacteria (SRB) play crucial roles in biogeochemical cycles.
  • Understanding bacterial responses to oxygen is vital for ecological and industrial applications.

Purpose of the Study:

  • To investigate the aerotaxis of Desulfovibrio desulfuricans and Desulfovibrio oxyclinae.
  • To elucidate the mechanisms of band formation in oxygen diffusion gradients.

Main Methods:

  • Utilized capillary microslides for controlled oxygen diffusion gradients.
  • Employed microscopy and oxygen microsensors to observe bacterial behavior and oxygen levels.
  • Studied the role of electron donors and cell density in aerotaxis.

Main Results:

  • Both SRB strains formed distinct ring-shaped bands around oxygen bubbles.
  • Band formation was dependent on oxygen availability, electron donors (lactate), and cell density.
  • High motility and specific aerotactic responses (positive and negative) were observed.

Conclusions:

  • Desulfovibrio exhibits efficient oxygen removal strategies through aerotaxis.
  • Bacterial respiration and directed movement are key to surviving and thriving in fluctuating oxygen environments.
  • This study provides insights into microbial adaptation and ecological interactions.

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