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The effects of the inoculum, pH, cation concentrations, and different lots of commercial media on the in vitro susceptibility of Clostridium difficile to fidaxomicin were examined. Of the factors evaluated, only pH alterations influenced the activity of fidaxomicin against C. difficile, noticeably reducing its activity at higher pH (> or =7.9).
A recent article (C. G. Thornton et al., J. Clin. Microbiol. 36:1996-2003, 1998) reported a new specimen-processing method for improved recovery of mycobacteria. This method used C18-carboxypropylbetaine (CB-18) and increased both smear and culture sensitivity. The companion article (C. G. Thornton et al., J. Clin. Microbiol. 36:2004-2013, 1998) described initial improvements to this method. Ad...
The extent to which age-related differences in neural markers of visual processing are influenced by changes in visual acuity has not been systematically investigated. Studies often indicate that their subjects had normal or corrected-to-normal vision, but the assessment of visual acuity seems to most frequently be based only on self-report. Consistent with prior research, to be included in the...
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