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High-resolution Patterned Biofilm Deposition Using pDawn-Ag43

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Light-Induced Patterning of Electroactive Bacterial Biofilms.

Fengjie Zhao¹, Marko S Chavez¹, Kyle L Naughton¹

¹Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States.

ACS Synthetic Biology

|June 22, 2022

Summary

This summary is machine-generated.

Researchers developed a new method to pattern conductive bacterial biofilms using light-controlled gene expression. This technique allows for precise control over living electronics, enabling tunable conductivity in bioelectronic devices.

Keywords:

Shewanella oneidensis MR-1 biofilm patterning electrochemical gating extracellular electron transfer

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Last Updated: Sep 7, 2025

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A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development

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Published on: June 7, 2012

Area of Science:

Bioelectronics
Microbiology
Materials Science

Background:

Electroactive bacterial biofilms offer unique living biomaterial properties, merging biological functions with electronic capabilities.
Current limitations in controlling biofilm geometry on electrodes hinder the advancement of bioelectronic devices.
Shewanella oneidensis is a model organism for studying electroactive biofilms.

Purpose of the Study:

To develop a lithographic strategy for patterning conductive biofilms of Shewanella oneidensis.
To control biofilm formation using a blue light-induced genetic circuit regulating aggregation protein CdrAB expression.
To demonstrate tunable conductivity and quantify the intrinsic conductivity of patterned biofilms.

Main Methods:

Utilized a blue light-induced genetic circuit to control CdrAB expression in Shewanella oneidensis.
Employed a lithographic approach for precise patterning of biofilms on transparent electrode surfaces.
Performed electrochemical measurements to assess biofilm conductivity and pattern size dependence.

Main Results:

Successfully patterned conductive Shewanella oneidensis biofilms on transparent electrodes.
Demonstrated tunable electrical conduction based on biofilm pattern size.
Quantified the intrinsic conductivity of the living biofilms, confirming theoretical predictions.
Validated a collision-exchange electron transport mechanism through experimental data.

Conclusions:

Developed a facile technique for controlled electroactive biofilm formation on electrodes.
The method enables precise spatial control over living electronics.
Findings have significant implications for the study and application of bioelectronics.
This work advances the field of living biomaterials and bioelectronic interfaces.