Journal
CORROSION SCIENCE
Volume 164, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108355
Keywords
Microbiological corrosion; Pseudomonas aeruginosa; Phenazine derivatives; Pyocyanin; Extracellular electron transfer
Funding
- National Key Research and Development Program of China [2016YFE0203600]
- National Natural Science Foundation of China [51771029]
- Beijing Nova Program [Z171100001117076]
- 111 Project [B17003]
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In Pseudomonas aeruginosa, phzM and phzS genes encode two enzymes that convert phenazine-1-carboxylate to pyocyanin (PYO), which is an efficient mediator for EET. Herein, an aerobic P. aeruginosa mutant strain with phzM and phzS genes knockout was used to confirm that phzM and phzS genes regulate EET-MIC of X80 carbon steel. The inhibition efficiency of MIC by mutant strain reached similar to 48 %, demonstrating that MIC was considerably suppressed since the mutant strain was no longer capable of producing sufficient PYO. When organic carbon was deficient, P. aeruginosa could utilise iron as an electron donor and caused more severe corrosion via EET.
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