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. 2019 Aug 24;17(9):494. doi: 10.3390/md17090494

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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QSI activity of tyramine and N-acetyltyramine. Effect of tyramine (green bars) and N-acetyltyramine (blue bars) on violacein production in C. violaceum ATCC 12472 (A); effect of tyramine (green bars) and N-acetyltyramine (blue bars) on pyoverdine production (B) and on swimming, swarming, and twitching motilities (C) in P. aeruginosa PAO1. Values are presented as mean ± SD, n = 3. The scale bar represents one centimeter. The percentage of reduction was calculated based on the area of expansion that was obtained analyzing the image with ImageJ.