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Related Experiment Videos

A new direct microscopy based method for evaluating in-situ bioremediation.

V K Bhupathiraju1, M Hernandez, P Krauter

  • 1Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720-1710, USA.

Journal of Hazardous Materials
|June 17, 1999
PubMed
Summary

A new epifluorescent microscopy method using 5-cyano-2, 3-ditolyl tetrazolium chloride (CTC) and 5-(4,6-dichlorotriazinyl) aminofluoroscein (DTAF) accurately quantifies microbial biomass and activity. This technique revealed higher microbial activity in contaminated soils, indicating successful bioremediation.

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Area of Science:

  • Environmental microbiology
  • Microbial ecology
  • Bioremediation technologies

Background:

  • Assessing microbial biomass and activity is crucial for understanding soil health and environmental processes.
  • Traditional methods like culture-based techniques often underestimate microbial populations and activity in complex environments.
  • There is a need for rapid, reliable methods to quantify microbial communities in situ, particularly in contaminated sites.

Purpose of the Study:

  • To develop and validate a novel epifluorescent microscopy method for quantifying total microbial biomass and activity.
  • To apply the developed method to assess in situ microbial activity in petroleum hydrocarbon-contaminated subsurface soils.
  • To compare microbial activity in contaminated areas with adjacent uncontaminated background locations.

Main Methods:

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  • Utilized 5-cyano-2, 3-ditolyl tetrazolium chloride (CTC) to stain metabolically active bacteria via intracellular formazan formation.
  • Employed 5-(4,6-dichlorotriazinyl) aminofluoroscein (DTAF) to stain bacterial cell walls for total biomass quantification.
  • Applied the CTC/DTAF staining protocol to soil samples from contaminated and background sites for epifluorescent microscopy analysis.

Main Results:

  • The CTC/DTAF method provided biomass estimates orders of magnitude higher than conventional culture-based techniques.
  • Both total and active bacterial concentrations were significantly higher in contaminated soils compared to background soils.
  • The percentage of metabolically active bacteria was consistently higher in contaminated areas, suggesting contaminant degradation.

Conclusions:

  • The CTC/DTAF staining protocol is a rapid, reliable, and inexpensive method for evaluating in situ microbial activity and biomass.
  • The method effectively differentiates between active and inactive microbial populations in complex soil matrices.
  • Findings support the use of this technique for monitoring the progress of in situ bioremediation in contaminated subsurface environments.