This image, created by reconstructing data from confocal fluorescence microscopy, shows Pseudomonas bacteria (green) clustered inside a gelatin "tire" (red). J. CONNELL ET AL., UNIVERSITY OF TEXAS AT AUSTINUsing a laser to activate cross-linking in a gelatin mold containing randomly scattered bacterial cells, researchers can “trap” the microbes in designated areas, dictating the 3-dimensional structure of the populations. The study, published today (October 7) in Proceedings of the National Academy of Sciences, could allow biologists to study the role of population architecture in cellular communication, while still allowing the flow of chemical messages.
“In microbial populations, there’s cooperation and there’s cheating and there’s competition, and so understanding how these very complicated things actually function is not something you can just do in a petri dish or a bulk broth,” said bioengineer Bryan Kaehr of Sandia National Laboratories in Albuquerque, NM. “In order for us to ever really understand cell communication in a meaningful way, you really have to organize populations like this—at this scale, the scale of cells.”
The work comes from Kaehr’s graduate advisor, chemist and bioengineer Jason Shear at the University of Texas at Austin, who has been working in 3-D fabrication using biological materials for about 10 years. Shear and his colleagues had previously used the cross-linking technique—which uses a laser to activate a photosensitizer ...
