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dc.contributor.authorFrederick, Jesse R.
dc.contributor.authorElkins, James G.
dc.contributor.authorBollinger, Nikki
dc.contributor.authorHassett, Daniel J.
dc.contributor.authorMcDermott, Timothy R.
dc.identifier.citationFrederick, J.R., J.G. Elkins, N. Bollinger, D.J. Hassett, and T.R. McDermott, ""Factors Affecting Catalase Expression in Pseudomonas aeruginosa Biofilms and Planktonic Cells,"" Appl. Environ. Microbiol. 67(3):139 (2001).en_US
dc.description.abstractPrevious work with Pseudomonas aeruginosa showed that catalase activity in biofilms was significantly reduced relative to that in planktonic cells. To better understand biofilm physiology, we examined possible explanations for the differential expression of catalase in cells cultured in these two different conditions. For maximal catalase activity, biofilm cells required significantly more iron (25 μM as FeCl3) in the medium, whereas planktonic cultures required no addition of iron. However, iron-stimulated catalase activity in biofilms was still only about one-third that in planktonic cells. Oxygen effects on catalase activity were also investigated. Nitrate-respiring planktonic cultures produced approximately twice as much catalase activity as aerobic cultures grown in the presence of nitrate; the nitrate stimulation effect could also be demonstrated in biofilms. Cultures fermenting arginine had reduced catalase levels; however, catalase repression was also observed in aerobic cultures grown in the presence of arginine. It was concluded that iron availability, but not oxygen availability, is a major factor affecting catalase expression in biofilms.en_US
dc.titleFactors affecting catalase expression in pseudomonas aeruginosa biofilms and planktonic cellsen_US
mus.citation.journaltitleApplied and Environmental Microbiologyen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US

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