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Multiple bacterial species coexisting in infected root canals might interact, but evidence for interspecies gene transfer is lacking. This study tested the hypothesis that horizontal exchange of antibiotic resistance can occur between different bacterial species in root canals. Transfer of the conjugative plasmid pAM81 carrying erythromycin resistance between 2 endodontic infection-associated species,...
We evaluated the effects of low-level inhalation exposures (whole body, 60min duration) to the chemical warfare nerve agent VX (0.016, 0.15, 0.30 or 0.45mg/m 3 ) in rats. The range of concentrations was approximately equivalent to 0.02–0.62 times 1.0 LC50. Biochemical effects were assessed by evaluating blood acetylcholinesterase (AChE) activity and by a regeneration assay that quantified...
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