Microbial Activity
Microbial Activity - Related Videos
02:46
Investigating the Human Gut Microbial Activity on Exopolysaccharides
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2026
Source: Hu, Y. et.al., Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems. J. Vis. Exp. (2019)This video demonstrates the analysis of short-chain fatty acid production by human gut microbiota in response to exopolysaccharides. This highlights microbial fermentation products separation and quantification using gas chromatography. The results reveal that exopolysaccharides modulate microbial metabolites that influence host-pathogen...
15:23
Determination of Microbial Extracellular Enzyme Activity in Waters, Soils, and Sediments using High Throughput Microplate Assays
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Cited by 113 •
2013
Microplate based procedures are described for the colorimetric or fluorometric analysis of extracellular enzyme activity. These procedures allow for the rapid assay of such activity in large numbers of environmental samples within a manageable time frame.
14:42
Biology of Microbial Communities - Interview
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Cited by 2 •
2007
09:19
Capturing Actively Produced Microbial Volatile Organic Compounds from Human-Associated Samples with Vacuum-Assisted Sorbent Extraction
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Cited by 2 •
2022
This protocol describes the extraction of volatile organic compounds from a biological sample with the vacuum-assisted sorbent extraction method, gas chromatography coupled with mass spectrometry using the Entech Sample Preparation Rail, and data analysis. It also describes culture of biological samples and stable isotope probing.
FAQs
Oxygen availability helps determine which energy-yielding pathways microorganisms can use. Under oxygenated conditions, microbial metabolism can support respiration, whereas limited oxygen can favor fermentation or other transformations. This distinction matters because changing oxygen conditions alters the forms and directions of chemical processing in soil and water environments.
Temperature, moisture, pH, and resource supply act as environmental controls on the processes microbes carry out. A change in any one can modify the suitability of conditions for obtaining energy, using nutrients, or breaking down organic matter. Considering these variables together improves interpretation of differences between habitats or sampling periods.
Bacteria, archaea, fungi, and protists can obtain energy from organic matter or inorganic compounds, so a community may support multiple types of metabolic processing. This functional diversity helps explain why environmental samples can continue transforming nutrients and materials under different chemical conditions. It also provides context for comparing ecosystems or disturbed sites.
Measurements provide evidence about the biological functioning of soil or water systems. Researchers can use them to evaluate decomposition-related processes, nutrient transformations, and ecosystem responses to disturbance. Interpreting the results alongside oxygen, temperature, moisture, pH, and resource availability helps distinguish changes in microbial functioning from differences caused by environmental conditions.
By breaking down organic matter and carrying out processes such as respiration and fermentation, microorganisms participate in the transformation of materials within ecosystems. Their metabolic work also supports nutrient cycling, including carbon and nitrogen transformations. Measuring these activities helps researchers evaluate how ecosystem processes may shift across environments or after disturbance.
The topic is central when researchers evaluate wastewater treatment, pollutant bioremediation, or ecosystem responses to environmental change. In these settings, microbial processes can indicate whether organic matter and pollutants are being transformed and can help assess how altered conditions may affect biogeochemical processes. The same information supports interpretation of soil and water quality.