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Community-level physiological profiling performed with an oxygen-sensitive fluorophore in a microtiter plate
Jay L Garland1, Michael S Roberts, Lanfang H Levine
1Dynamac Corporation, Mail Code DYN-3, Kennedy Space Center, FL 32899, USA. jay.garland-1@ksc.nasa.gov
Applied and Environmental Microbiology
|May 7, 2003
Summary
Community-level physiological profiling using fluorometric oxygen consumption detection revealed that acclimation to specific substrates enhances microbial response. Nitrogen availability significantly impacts this metabolic activity in hydroponic and salt marsh environments.
Area of Science:
- Environmental microbiology
- Biogeochemical processes
- Ecosystem analysis
Background:
- Microbial communities drive critical ecosystem functions.
- Understanding microbial metabolic responses to environmental factors is essential.
- Fluorometric detection offers a sensitive method for physiological profiling.
Purpose of the Study:
- To assess community-level physiological profiles (CLPP) in different environmental matrices.
- To investigate the impact of substrate acclimation on microbial respiration.
- To determine the role of nitrogen availability in microbial metabolic activity.
Main Methods:
- Fluorometric detection of oxygen consumption for CLPP.
- Analysis of hydroponic rhizosphere and salt marsh litter samples.
- Controlled incubation with varying substrate levels (50 ppm) and durations (5-24 h).
Main Results:
- Microbial respiration rates and extent increased with substrate-specific acclimation.
- Reduced nitrogen availability led to decreased microbial response.
- Sensitivity of the method allowed detection at low substrate concentrations.
Conclusions:
- Community-level physiological profiling is effective for assessing microbial responses.
- Substrate acclimation and nitrogen availability are key regulators of microbial metabolism in these ecosystems.
- This method provides insights into microbial functional potential and environmental interactions.