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Related Experiment Video

Updated: May 2, 2026

Assembly and Tracking of Microbial Community Development within a Microwell Array Platform
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Clear as mud redefined: Tunable transparent mineral scaffolds for visualizing microbial processes below ground.

Laura K Quinn1, Kriti Sharma2, Katherine T Faber3

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

PNAS Nexus
|May 12, 2025
PubMed
Summary

Researchers developed optically transparent mineral scaffolds to study microbes in sediments. This new tool allows visualization of microbial colonization and activity within complex underground environments.

Keywords:
cryoliteendolithic microorganismsice templatingmicrobial colonizationrock porositysoil structurespatial microbial ecology

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Area of Science:

  • Environmental microbiology
  • Materials science
  • Geomicrobiology

Background:

  • Microbial processes in sediments are vital for biogeochemical cycles but difficult to study due to opaque matrices.
  • Existing methods struggle to visualize microbial life within complex porous environments.

Purpose of the Study:

  • To create optically transparent mineral scaffolds for visualizing microbial colonization and activity in sediment and rock microenvironments.
  • To develop a tool for in situ and laboratory investigations of previously obscured microbial habitats.

Main Methods:

  • Developed optically transparent cryolite mineral scaffolds using suspension-based, freeze-casting techniques.
  • Controlled scaffold pore size and architecture by fine-tuning freezing parameters and solvents.
  • Utilized epifluorescence microscopy and Raman spectroscopy for microbial visualization and activity measurements.

Main Results:

  • Generated scaffolds mimic complex 3D sediment/rock structures with controllable porosity.
  • Demonstrated compatibility with microscopy for visualizing microbial colonization up to 100 µm depth.
  • Showcased potential for single-cell activity quantification using stable isotope probing coupled with Raman-FISH.

Conclusions:

  • Cryolite scaffolds provide a novel method for studying microbial communities in opaque geological materials.
  • This tool enables highly resolved, spatially explicit investigations of underground microbial distribution, activities, and interactions.
  • The developed scaffolds are relevant for environmental field studies, as shown by visualization in seagrass rhizosphere sediments.