Analogs of furanonaphthoquinone (FNQ) from Tecoma ipe Mart had MICs ranging from 1.56 to 25 microg/ml against gram-positive bacteria. FNQ showed significantly lower MICs against methicillin-resistant Staphylococcus aureus than against methicillin-sensitive S. aureus. FNQ inhibited Helicobacter pylori with an MIC of 0.1 microg/ml. Fungi, including pathogenic species, were sensitive to FNQ with MICs similar to those of amphotericin B.
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Nagata et al. (1998) studied this question.
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