Investigating the effects of different physical and chemical stress factors on microbial biofilm

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dc.contributor.authorVatansever, Cansu
dc.contributor.authorTüretgen, İrfan
dc.date.accessioned2021-05-15T12:41:51Z
dc.date.available2021-05-15T12:41:51Z
dc.date.issued2018
dc.departmentEczacılık Fakültesi, Farmasötik Mikrobiyoloji Anabilim Dalıen_US
dc.descriptionTuretgen, Irfan/0000-0002-7866-1007; Turetgen, Irfan/0000-0002-7866-1007
dc.description.abstractMicroorganisms that adhere to surfaces in order to protect themselves from many adverse environmental conditions form a layer called biofilm. Biofilms protect bacteria from changing environmental conditions such as starvation, antibiotics, disinfectants, pH and temperature fluctuation, dryness and UV rays. In this study, biofilms were formed on surfaces of glass coupons in a cooling tower model system over a period of 180 days. The biofilms were treated with various stress factors monthly. These stress factors were: exposure to temperatures of 4 degrees C and 60 degrees C, pH of 3, 5, and 11, 3 M aqueous NaCl and distilled water, as well as, monochloramine at 2, 500, and 1 000 mg/L (ppm). Following the treatment with stress factors, both the numbers of actively respiring bacteria and the total bacteria in the biofilms were determined by CTC-DAPI staining. The aerobic heterotrophic plate counts (HPC) in the biofilms were determined by the conventional culture method of spread plating on R2A agar. The aim of this study was to determine the impact of these stressors on the model cooling-tower biofilms. Of the stressors tested, those that had the greatest impact were a temperature of 60 degrees C, pH of 3, 3 M NaCl, and monoch lora mi ne at both 500 and 1 000 mg/L. however, when using a non-culture-based viability assay (CTC-DAPI staining), an extremely high number of live bacteria were detected even after applying the most effective stress factors (with the exception of pH 3) of 60 degrees C, 3 M NaCl, monochloramine at 500 and 1 000 mg/L. Results showed that biofilm protects the bacteria from extreme physical and chemical stress conditions. Additionally, the conventional culture technique cannot detect the presence of bacteria that have entered the viable but non-culturable (VBNC) phase; the use of different techniques, such as microscopy and cytometry (flow and solid-phase), is therefore important to obtain more accurate results.en_US
dc.description.sponsorshipResearch Fund of the Istanbul UniversityIstanbul University [8385]en_US
dc.description.sponsorshipThis work was supported by 'Research Fund of the Istanbul University' Project number: 8385.en_US
dc.identifier.doi10.4314/wsa.v44i2.16
dc.identifier.endpage317en_US
dc.identifier.issn0378-4738
dc.identifier.issn1816-7950
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-85045964629
dc.identifier.scopusqualityQ3
dc.identifier.startpage308en_US
dc.identifier.urihttps://doi.org/10.4314/wsa.v44i2.16
dc.identifier.urihttps://hdl.handle.net/20.500.12939/863
dc.identifier.volume44en_US
dc.identifier.wosWOS:000434082400016
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorVatansever, Cansu
dc.language.isoen
dc.publisherWater Research Commissionen_US
dc.relation.ispartofWater Sa
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectBiofilmen_US
dc.subjectStress Factorsen_US
dc.subjectMonochloramineen_US
dc.subjectCTC-DAPI Stainingen_US
dc.titleInvestigating the effects of different physical and chemical stress factors on microbial biofilm
dc.typeArticle

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