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Quorum sensing molecules in activated sludge could trigger microalgae lipid synthesis.

Chaofan Zhang1, Qingcheng Li1, Liang Fu1

  • 1School of Environment, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.

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|May 22, 2018
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Summary

Microbial contamination in wastewater, triggered by quorum sensing molecules (QSMs), significantly boosts microalgae lipid production for biofuel. This study reveals contamination enhances lipid content by 84% while only slightly reducing biomass.

Keywords:
BacteriaBiomassCell-to-cell communicationLipid productionMicroalgaeQuorum sensing molecules

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Microbiology

Background:

  • Wastewater cultivation of microalgae offers an economical route to biofuel production.
  • Strict control of microbial contamination is typically required.
  • Microalgae lipid accumulation can be induced by environmental stressors.

Purpose of the Study:

  • To investigate if microbial contamination acts as a stressor for microalgae.
  • To test the hypothesis that quorum sensing molecules (QSMs) mediate this effect.
  • To evaluate the impact of QSMs on microalgae lipid and biomass production.

Main Methods:

  • Studied the effects of QSMs from activated sludge on Chlorophyta sp.
  • Analyzed changes in lipid content and biomass production.
  • Examined the regulation of fatty acid synthesis and DNA replication enzymes.

Main Results:

  • QSM exposure increased Chlorophyta sp. lipid content by approximately 84%.
  • Biomass production experienced only a slight decrease.
  • Enzymes in fatty acid synthesis pathways were generally up-regulated, while DNA replication enzymes were slightly down-regulated.

Conclusions:

  • Microbial contamination, via QSMs, positively influences microalgae biofuel production.
  • Total lipid production improved by 86% under QSM stress.
  • Findings challenge the conventional view of microbial contamination as solely detrimental.