Characterizing spatiotemporal microbial colony distributions in printed PEG-DA hydrogel films

Area of Science:

• Microbiology
• Biotechnology
• Materials Science

Background:

• Biofilms are complex microbial communities with significant ecological and industrial impact.
• Understanding the structure-function relationship in biofilms is vital but challenging due to their complexity.
• Bioprinting offers a novel approach to control biofilm architecture for systematic study.

Purpose of the Study:

• To explore microscale colony distributions in bioprinted biofilms.
• To investigate the relationship between initial bacterial concentration and biofilm structure.
• To establish a foundation for printing microbial communities with defined characteristics.

Main Methods:

• Light-based bioprinting of hydrogel films with dispersed *Pseudomonas fluorescens*.
• Systematic variation of bacterial concentration over three orders of magnitude.
• Microscopy and image analysis to track colony growth and quantify structural features.

Main Results:

• Empirical relationships were observed between initial cell concentration and key structural features.
• Colony size, volume, total biovolume, and characteristic gradient length scale were quantified.
• The study successfully characterized spatiotemporal colony development in bioprinted biofilms.

Conclusions:

• Bioprinting provides precise control over biofilm structure, enabling systematic studies of microbial communities.
• Knowledge gained can be applied to printing complex 3D microbial structures.
• This work advances the understanding of biofilm formation and provides a tool for future research.