Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 8. (Budapest 1957)

Bohus, G. ; Gyarmati, B.: The effects of temperature and pressure on fungi causing wood-decay

Even less sensitive : Lenzites abietina (8) Lenzites betulina (9) Stereum purpureum (7) V er ti allium glaucum (11) Trametes hirsuta (15) Daedalea quercina (12) Lentinus squamosus (13) Schizophyllum commune (14) The most insensitive According to this tentative grouping, we may take it as established that one cannot rely on an absolutely dependable and complete sterilization in the middle of the larger samples, even in the most favourable case. To have the unconditional destruction of the mycelia of most of the fungi species, — and that too in the middle of the Sortiment — one has to assure, in every method and in every case, a temperature of 65 °C during a period of about 2,5 hours. For the functional changes in temperature and time concerning the percentil revival of the species, we give the example of Bulgaria polymorpha in Figure 2. Heat effect researches have shown that Merulius lacrymans, playing the frequentestrole in the fungal infections of built-in wooden materials, is especially sensitive to heat treatments, and that it can be destroyed in the infected wooden material by the application of even 35° C in a relatively short time. Examining the effects of the vacuum, we arrived at the conclusion that this method used in saturating processes (its duration being 90 minutes at best, its rate 700 mercurial mm at most) is unable to cause observable changes as a 100 per cent of the cultures revived. Air pressure and the pressure of saturants (by themselves, and without heat treatment) were also ineffective, as no cultures perished under the usual 12 atmospheres during a period of 4 hours. % 80 Fig. 2. Applications of pressure and vacuum