Like humans, bacteria are social creatures – here they’ve built a thriving community inside a human mouth. Tiny fluorescent probes highlight nine different types of bacteria in different colours using their unique DNA sequences to tell them apart – a technique called fluorescence in situ hybridization (FISH). Researchers are fascinated by how the Corynebacterium (purple), Actinomyces (white) and Leptotrichia (light blue) bacteria, among others, organise themselves into furry 'hedgehog' formations like the three shown here side-by-side. Studying the geography of bacterial communities, or microbiomes, gives clues to how they exchange chemicals to communicate, grow and survive. It is also quite unsettling – this community was found inside the dental plaque of volunteers who hadn’t brushed their teeth for two days. A sobering reminder to stop reading and go to find some floss.
BPoD stands for Biomedical Picture of the Day. Managed by the MRC London Institute of Medical Sciences the website aims to engage everyone, young and old, in the wonders of biomedicine. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.
BPoD is also available in Catalan at www.bpod.cat with translations by the University of Valencia.