A mass spectrometric study of ions extracted from DC positive corona discharges in ambient air has been carried out within the air pressure range of 2.5 kPa-20 kPa. The multicomponent character of the mass spectra was confirmed. The dominant series of ions observed in the mass spectra were of the type [H 3 O] + .(H 2 O) n especially in the low current regime. In the high current regime, or 'streamer' regime of the corona discharge, atomic nitrogen and oxygen ions were also discovered, but the intensities of these were relatively low in comparison with the intensities of peaks corresponding to the molecular ions. A new mechanism responsible for the disappearance of [O 2 ] + and its hydrated forms from the mass spectra is given. This is based on the set of stepwise processes originated by the three-body process:The model is also capable of explaining some other phenomena initiated by the presence of water in the air, as well as the effects observed in dry air.
ABSTRACT:The purpose of the research was to examine the decomposition rate of beech (Fagus sylvatica) and aspen (Populus tremula) logs after an oyster mushroom (Pleurotus ostreatus) infection as well as the effect of fruit body formation on the chemical composition of wood. The highest mean value of biological efficiency (B.E.) was found on beech logs (29.05%), but relatively high values of B.E. were recorded also on aspen logs (21.69%). The average content of N was about 37% higher in inoculated logs than in the control (not inoculated) ones. The ash content was about 90% higher in inoculated logs. The content of the mineral elements Ca, Mn, Zn, Cu, Pb, Al, B, and Mg had an increasing tendency in inoculated logs compared with control ones. The logs with minimal production of fruit bodies had the highest content of the mineral elements Pb, Al, Fe, Mg and P.
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