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. 2015 Jun 5;13(6):3581–3605. doi: 10.3390/md13063581

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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Screening fresh H. siliquosa fronds for antimicrobial, QSI and QS activity using the overlay method. (A) Very weak antimicrobial activity (2 mm inhibition zone) against E. coli ATCC 11303; (B) No antimicrobial activity detected against K. pneumonia NCTC 204; (C) Pronounced antimicrobial activity of H. siliquosa against S. aureus (MRSA) ATCC 33595; (D,E) Weak antimicrobial activity of H. siliquosa against P. aeruginosa PAO1 and PA14; (F) No antimicrobial nor QSI activity detected against Serratia sp. ATCC39006; (G) No antimicrobial activity against E. cloacae. (H,I) Pronounced antimicrobial activity of H. siliquosa against QSI reporter strain C. violaceum ATCC 12472 and QS reporter strain C. violaceum CV026.