Publications by authors named "Mirva Kosonen"
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.
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- The research investigates how colored biofilms, particularly from the genus Meiothermus, impact the paper industry by analyzing samples from 24 different machines in four countries.
- Using real-time PCR, the study quantified Meiothermus presence in process deposits, revealing a significant range from 10,000 to 100 billion gene copies per gram of deposit.
- It was found that Meiothermus spp. contribute to product defects, as they were common in paper and board products with color issues, with Meiothermus silvanus and M. ruber being the most frequently identified species.
Formation of microbial biofilms and slimes is a general and serious problem in the operation of paper machines. Studies of microbial populations in paper machine-derived biofilms have been conducted using standard microbiological procedures; however, the bacterial genera present in this type of samples as well as their diversity are quite poorly known. Here, the bacterial diversity of 38 process water and 22 biofilm samples from four different Finnish paper machines were analyzed by length heterogeneity analysis of PCR-amplified 16S ribosomal DNA (LH-PCR).
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