Ennoblement of Stainless Steel by the Manganese-Depositing Bacterium Leptothrix discophora.

Applied and Environmental Microbiology
W H DickinsonZbigniew Lewandowski

Abstract

The noble shift in open-circuit potential exhibited by microbially colonized stainless steel (ennoblement) was investigated by examining the relationship among surface colonization, manganese deposition, and open-circuit potential for stainless steel coupons exposed to batch cultures of the manganese-depositing bacterium Leptothrix discophora. Open-circuit potential shifted from -100 to +330 mV(infSCE) as a biofilm containing 75 nmol of MnO(infx) cm(sup-2) formed on the coupon surface but changed little further with continued MnO(infx) deposition up to 270 nmol cm(sup-2). Increased open-circuit potential corresponded to decreasing Mn(II) concentration in solution and to increased MnO(infx) accumulation and attached cell density on the coupon surfaces. MnO(infx) deposition was attributable to biological activity, and Mn(II) was observed to enhance cell attachment. The experimental results support a mechanism of ennoblement in which open-circuit potential is fixed near +350 mV(infSCE) by the cathodic activity of biomineralized MnO(infx).

References

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Citations

Jun 7, 2011·Current Microbiology·Michinori SawayamaJun Takada
Feb 13, 2016·Microbial Biotechnology·Souichiro Kato
Sep 27, 2003·Environmental Microbiology·Paul W BakerKazuya Watanabe
Jun 24, 2008·Biofouling·Judy GopalK A Natarajan
Jun 3, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Kristen M Kruszewski, Ellen S Gawalt
Jul 29, 2005·Environmental Science & Technology·Allison RhoadsZbigniew Lewandowski
Jan 12, 2008·Environmental Science & Technology·Tuan Anh NguyenXianming Shi

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