Quantitative contributions of bacteria and of Deinococcus geothermalis to deposits and slimes in paper industry
Abstract
Deinococcus geothermalis has frequently been isolated from pink colored deposits of paper industry processes. Laboratory studies have shown that D. geothermalis is capable of forming on nonliving surfaces patchy biofilms that are resistant to adverse agents such as extreme pH, desiccation, solubilising detergents and biocides. This study was done to quantitatively assess the role of D. geothermalis as a biofouler in paper industry. Colored deposits were collected from 24 European and North American paper and board machines and the densities of the bacterial 16S rRNA genes and those of the red slime producers D. geothermalis and Meiothermus spp. were measured by QPCR (quantitative real time PCR). D. geothermalis was found at nine machines, usually from splash area deposits, but its contribution was minor, 0.001–1%, to the total bacterial burden of 8.3 to log 10.5 log units per gram wet-weight of the deposits. When D. geothermalis was found in a measurable quantity, Meiothermus spp. also was found, often in bulk quantity (7–100% of the total bacteria). The data are in line with the properties of D. geothermalis known from laboratory biofilm studies, indicating this species is a pioneer coloniser of machine surfaces and may help other bacteria to adhere and grown into biofilms, rather than competing with them.
Keywords
Biofilm Deinococcus geothermalis Paper machine Biofouling Quantitative RT-PCRNotes
Acknowledgments
This project was financially supported by the Academy of Finland (53305) and the Photobiomics grant (18637) and TEKES Läiskä project (1364/31/05), PhD fellowships and other support from ABS (M.P.) and EnSTe (J.E, C.KÖ) graduate schools are highly acknowledged. We thank the Viikki Science Library and the Faculty Instrument Centre for expert services and Leena Steininger, Hannele Tukiainen and Tuula Suortti for many kinds of help.
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