Related Experiment Videos
Gramicidin S production by Bacillus brevis in simulated microgravity
A Fang1, D L Pierson, S K Mishra
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Current Microbiology
|April 1, 1997
Summary
Bacillus brevis produced gramicidin S (GS) in simulated microgravity. Microgravity did not affect GS production, but glycerol
Area of Science:
- Microbial secondary metabolism
- Space biology and astrobiology
- Biotechnology and bioprocessing
Background:
- Microbial secondary metabolism is crucial for producing valuable compounds.
- Simulated microgravity environments are used to study cellular responses.
- Understanding factors affecting microbial production is vital for industrial applications.
Purpose of the Study:
- To investigate gramicidin S (GS) production by Bacillus brevis under simulated microgravity.
- To compare GS production in simulated microgravity versus normal gravity.
- To determine the influence of glycerol on GS production in different gravitational conditions.
Main Methods:
- Utilized NASA High Aspect Rotating Vessels (HARVs) to simulate microgravity.
- Cultured Bacillus brevis strain Nagano in HARVs and under normal gravity.
- Quantified gramicidin S production and cell growth.
Main Results:
- Bacillus brevis demonstrated growth and gramicidin S production in simulated microgravity.
- Gramicidin S production was not significantly affected by simulated microgravity compared to normal gravity.
- The repressive effect of glycerol on GS formation observed in flasks was absent in HARVs.
Conclusions:
- Simulated microgravity does not inhibit gramicidin S production in Bacillus brevis.
- The negative impact of glycerol on specific GS formation is dependent on shear forces and vessel geometry, not gravity.
- Findings suggest that bioreactor design and operational parameters are critical for optimizing microbial production in space.