Escherichia coli ( E. coli ) ST131 is a multidrug-resistant pandemic clone of extended-spectrum beta-lactamase-producing bacteria, with the primary reservoir within the gut. A biotherapeutic strategy to limit the intestinal carriage of ST131 E. coli isolates has been developed using a modified version of the probiotic E. coli strain Nissle 1917 (EcN 2.0) that does not exhibit genotoxic activity and overexpresses microcins. The...

The biogeochemical cycling of nitrogen (N) plays a critical role in supporting marine ecosystems and controlling primary production. Nitrification, the oxidation of ammonia (NH 3 ) by microorganisms, is an important process in the marine N cycle, supplying nitrate (), the primary source of N that fuels new phytoplankton growth, and the primary substrate for the microbial process of denitrification. Understanding nitrification...

Summary Swarming is a type of social motility allowing the migration of highly differentiated bacterial cells. Swarming shares many similarities with biofilm communities, which are notable for their high resistance to antimicrobial agents. We investigate here if the swarming behaviour could also be associated with a widespread antimicrobial resistant phenotype. Challenged with 13 antibiotics from various classes, swarm cells o...

Summary Pseudomonas aeruginosa presents three types of motilities: swimming, twitching and swarming. The latter is characterized by rapid and coordinated group movement over a semisolid surface resulting from morphological differentiation and intercellular interactions. A striking feature of P. aeruginosa swarming motility is the formation of migrating tendrils producing colonies with complex fractal‐like patterns. Previous st...