Self-organized canals enable long-range directed material transport in bacterial communities

Area of Science:

• Microbiology
• Biophysics
• Systems Biology

Background:

• Multicellular organisms rely on long-range transport, unlike bacteria which are typically limited by diffusion.
• Understanding bacterial transport mechanisms is key to comprehending microbial community dynamics.

Purpose of the Study:

• To investigate long-range material transport in structured bacterial communities.
• To elucidate the mechanisms and implications of self-organized transport systems in bacteria.

Main Methods:

• Utilized *Pseudomonas aeruginosa* colonies as a model system.
• Employed shear-induced banding to observe channel formation.
• Measured fluid flow profiles and developed mathematical models.

Main Results:

• Discovered spontaneous development of open-channel systems in bacterial colonies.
• Observed high-speed transport (up to 450 µm/s) of cells and vesicles.
• Demonstrated channel-mediated eradication of competing *Staphylococcus aureus* colonies.
• Identified interfacial tension and biosurfactants as drivers of channel flow.

Conclusions:

• Mechanochemical coupling drives large-scale material transport in bacterial communities.
• Bacterial open-channel systems offer a novel principle for engineering self-organized microbial communities.
• This research reveals sophisticated transport capabilities in primitive life forms.