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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la9047853
|2 doi
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|a pubmed24n0656.xml
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|a (DE-627)NLM196800897
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|a (NLM)20334394
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Hu, Yifan
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Interfacial electrochemical electron transfer processes in bacterial biofilm environments on Au(111)
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| 264 |
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|c 2010
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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| 500 |
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|a Date Completed 08.09.2010
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|a Date Revised 26.05.2010
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|a published: Print
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|a Citation Status MEDLINE
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|a We have studied Streptococcus mutans (S. mutans) biofilm growth and growth inhibition on Au(111)-surfaces using atomic force microscopy (AFM) and interfacial electrochemistry of a number of redox probe molecules. AFM of the biofilm growth and growth inhibition on both mica and Au(111)-surfaces was followed by sampling at given times, drying the samples naturally, and imaging. The electrochemical investigations were based on single-crystal Au(111)-electrode surfaces to exclude polycrystallinity as a cause of inhomogeneous voltammetric broadening on the biofilm covered electrode surfaces. The redox couples were chosen for their positive ([Ru(NH(3))(6)](3+/2+), [Co(terpy)(2)](3+/2+), terpy = 2,2',2''-terpyridine) or negative ([Fe(CN)(6)](3-/4-), [IrCl(6)](3-/4-)) electrostatic charge. [Co(NH(3))(6)](3+/2+) and [Co(phen)(3)](3+/2+) (phen = 1,10-phenanthroline) were other inhibition factors investigated. The positively and negatively charged redox probe couples displayed antagonistic inhibition and voltammetric patterns. [Ru(NH(3))(6)](3+/2+) and the homologous compound [Co(NH(3))(6)](3+/2+) were the only probe compounds to effect growth inhibition. On the other hand, cyclic voltammetry (CV) of both [Ru(NH(3))(6)](3+/2+) (positively charged, biofilm growth inhibitor) and [Co(terpy)(2)](3+/2+) (positively charged, no biofilm growth inhibition) displayed fully reversible CV on biofilm covered electrodes, almost indistinguishable from CV at bare Au(111)-electrode surfaces. In comparison, CVs of [Fe(CN)(6)](3-/4-) and [IrCl(6)](3-/4-) (both negatively charged and no growth inhibition) were distorted from planar diffusion behavior on bare Au(111)-electrode surfaces toward spherical diffusion behavior on S. mutans biofilm covered Au(111)-electrode surfaces. DNAase treatment of the biofilm covered Au(111)-electrode surface partly restores planar diffusion CV of [Fe(CN)(6)](3-/4-) and [IrCl(6)](3-/4-). This is reflected in a decrease of the growth rate and the appearance of molecular-scale structures near the bacterial edges as imaged by AFM after DNAase treatment. A rationale for the different voltammetric behavior of positively and negatively charged redox probe molecules based on electrostatic properties of the local surface environment is offered
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Gold
|2 NLM
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| 650 |
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|a 7440-57-5
|2 NLM
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| 700 |
1 |
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|a Zhang, Jingdong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ulstrup, Jens
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 26(2010), 11 vom: 01. Juni, Seite 9094-103
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:26
|g year:2010
|g number:11
|g day:01
|g month:06
|g pages:9094-103
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|u http://dx.doi.org/10.1021/la9047853
|3 Volltext
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