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- Title
Effects of engineered silver nanoparticles on the growth and activity of ecologically important microbes.
- Authors
Beddow, Jessica; Stolpe, Björn; Cole, Paula; Lead, Jamie R.; Sapp, Melanie; Lyons, Brett P.; Colbeck, Ian; Whitby, Corinne
- Abstract
Currently, little is known about the impact of silver nanoparticles ( AgNPs) on ecologically important microorganisms such as ammonia-oxidizing bacteria ( AOB). We performed a multi-analytical approach to demonstrate the effects of uncapped nanosilver ( uAgNP), capped nanosilver ( cAgNP) and Ag2 SO4 on the activities of the AOB: N itrosomonas europaea, N itrosospira multiformis and N itrosococcus oceani, and the growth of E scherichia coli and B acillus subtilis as model bacterial systems in relation to AgNP type and concentration. All Ag treatments caused significant inhibition to the nitrification potential rates ( NPRs) of N itrosomonas europaea (decreased from 34 to < 16.7 μM NH4+ oxidized day−1), N itrosospira multiformis (decreased from 46 to < 24.8 μM NH4+ oxidized day−1) and N itrosococcus oceani (decreased from 26 to < 18.4 μM NH4+ oxidized day−1). E scherichia coli- Ag interactions revealed that the percentage of damaged E . coli cells was 45% greater with Ag2 SO4, 39% with cAgNPs and 33% with uAgNPs compared with controls. Generally, the inhibitory effect on AOB NPRs and E . coli/ B . subtilis growth was in the following order Ag2 SO4 > cAgNP > uAgNP. In conclusion, AgNPs (especially cAgNPs) and Ag2 SO4 adversely affected AOB activities and thus have the potential to severely impact key microbially driven processes such as nitrification in the environment.
- Subjects
SILVER nanoparticles; MICROBIAL ecology; AMMONIA-oxidizing bacteria; NITROSOMONAS europaea; ESCHERICHIA coli; BACILLUS subtilis
- Publication
Environmental Microbiology Reports, 2014, Vol 6, Issue 5, p448
- ISSN
1758-2229
- Publication type
Article
- DOI
10.1111/1758-2229.12147