Impact of TiO2 nanoparticles on growth, biofilm formation, and flavin secretion in Shewanella oneidensis.

ABSTRACT: Understanding of nanoparticle impacts on critical bacteria functions allows us to gain a mechanistic understanding of toxicity and guides us toward design rules for creating safe nanomaterials. Herein, biofilm formation, a general bacteria function, and riboflavin secretion, a species-specific function, were monitored in Shewanella oneidensis, a metal reducing bacterium, following exposure to a variety of TiO2 nanoparticle types (synthesized, Aeroxide P25, and T-Eco). Transmission electron microscopy (TEM) images show that dosed nanoparticles are in close proximity to the bacteria, but they are not internalized. Using quartz crystal microbalance (QCM), it was revealed that S. oneidensis biofilm formation is slowed in the presence of nanoparticles. Though S. oneidensis grows more slowly in

SUBMITTER: Maurer-Jones MA 

PROVIDER: S-EPMC3733218 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature