Sanna Jokela

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Colored biofilms cause problems in paper industry. In this work we used real-time PCR to detect and to quantitate members of the genus Meiothermus from the process samples and end products from 24 machines manufacturing pulp, paper and board in four countries. The results obtained from 200 samples showed the importance of members of the genus Meiothermus as(More)
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(More)
microRNAs (miRNA) are recognized as regulators of gene expression during development and cell differentiation as well as biomarkers of disease. Development of rapid and sensitive miRNA profiling methods is essential for evaluating the pattern of miRNA expression that varies across normal and diseased states. The ability to identify miRNA expression patterns(More)
Zinc oxide ͑ZnO͒ is a wide-band gap semiconductor that has attracted tremendous interest for optical, electronic, and mechanical applications. First-principles calculations by ͓C. G. Van de Walle, Phys. Rev. Lett. 85, 1012 ͑2000͔͒ have predicted that hydrogen impurities in ZnO are shallow donors. In order to determine the microscopic structure of hydrogen(More)
The pressure response of the ultraviolet photoluminescence of ZnO nanocrystallites and MgZnO nanoalloy of composition 15% Mg:85% Zn of the wurtzite structure was studied. The authors found that up to 7 GPa the pressure coefficients of ZnO and MgZnO are 23.6 and 27.1 meV/ GPa, respectively. The pressure coefficient of the ZnO nanocrystallites is similar to(More)
Zinc oxide (ZnO) has emerged as a leading material for micro-and optoelectronic applications. Although the fabrication of ZnO, from nanocrystals to bulk single crystals, is well established, a major roadblock for fabricating optoelectronic devices is the lack of reliable p-type doping. The presence of compensating donors inhibits the growth of p-type ZnO.(More)
Zinc oxide ͑ZnO͒ is a wide-band-gap semiconductor with potential optical, electronic, and mechanical applications. First-principles investigations ͓C. showed that a local vibrational mode at 3326.3 cm −1 , at liquid-helium temperatures, corresponded to an O-H type bond. The microscopic structure of this hydrogen complex, however, was not determined. In this(More)
Zinc oxide ͑ZnO͒ is semiconductor with a wide band gap of 3.4 eV. It continues to gain more attention not only for its versatile use in industry but also its potential for further application in electronics, optics, spintronics, and transparent circuits. Many of these applications require p-type ZnO. Nitrogen substituting for oxygen is a possible acceptor(More)