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Updated: May 6, 2026

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

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Estimation ofEscherichia coli mortality in seawater by the decrease in(3)H-label and electron transport system

J Martinez¹, J Garcia-Lara, J Vives-Rego

¹Departament de Microbiologia, Universitat de Barcelona, Av. Diagonal, 645, 08028, Barcelona, Spain.

Microbial Ecology

|November 8, 2013

Summary

This summary is machine-generated.

Assessing Escherichia coli mortality in seawater using cellular radiolabelling and electron transport system activity revealed that particulate matter was the main cause of bacterial death. These methods offer reliable insights into bacterial survival in marine environments.

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Area of Science:

Environmental Microbiology
Marine Ecology
Bacteriology

Background:

Understanding bacterial mortality is crucial for marine ecosystem health.
Escherichia coli serves as an indicator organism in aquatic environments.
Accurate assessment of bacterial survival in seawater is challenging.

Purpose of the Study:

To evaluate methods for assessing Escherichia coli mortality in marine settings.
To identify key factors contributing to bacterial demise in seawater.
To validate the use of cellular radiolabelling and metabolic activity assays for bacterial survival studies.

Main Methods:

Viable counts were performed to enumerate live bacteria.
Electron transport system activity was measured as an indicator of metabolic activity.
Cellular (3H)-labelling was employed to track bacterial survival and mortality.
Filtration techniques were utilized to differentiate grazing mortality.

Main Results:

Cellular radiolabelling and electron transport system activity proved effective for assessing E. coli survival.
The decrease in the (3H)-label correlated well with viable counts and metabolic activity.
Particulate matter, specifically fractions between 0.2 and 2 μm, was identified as the primary cause of E. coli mortality.

Conclusions:

Cellular radiolabelling and electron transport system activity are reliable indicators of bacterial survival in seawater.
Bacterial mortality in marine environments is significantly influenced by interactions with particulate matter.
Further research into the mechanisms of particulate-mediated bacterial death is warranted.