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Interakcije bakrovih zaščitnih pripravkov z lesom in z lesnimi glivami : doktorska disertacija = Interactions of copper based preservatives with wood and wood decay fungi : dissertation thesisHumar, MihaZa zaščito lesa se zelo pogosto uporabljajo zaščitni pripravki na osnovi bakrovih spojin. Bakrovi pripravki izredno učinkovito zavirajo rast gliv razkrojevalk lesa. Njihova slaba lastnost je, da se ... iz lesa izpirajo. Želeli smo poiskati reagente, ki bi izpiranje Cu preprečili. Poleg tega so se v zadnjem času začeli pojavljati tudi sevi gliv, ki so odporni na baker in mehanizem njihove tolerance še ni v celoti pojasnjen. Ugotovili smo, da pri pripravi vodnega zaščitnega pripravka na osnovi Cu(II) oktanoata in etanolamina predhodna sinteza Cu(II) oktanoata ni potrebna, ker dobimo zaščitni pripravek z enakimi lastnostmi že, če med seboj v enakem razmerju zmešamo Cu(II) sulfat, oktanojsko kislino in etanolamin. Vezava Cu v les je v omenjenem sistemu bistveno boljša kot pri lesu, ki je bil zaščiten le z vodno raztopino Cu(II) sulfata. Potrdili smo tudi velik vpliv izločanja oksalne kisline na toleranco gliv na z bakrovimi pripravki zaščiten les. Gliva Antrodia vaillantii, ki tvori več oksalne kisline kot glive Trametes versicolor, Gloeophyllum trabeum in Schizophyllum commune, je bila bolj tolerantna na bakrove pripravke. Med glivnim razkrojem lesa, Cu v lesu reagira z oksalno kislino, ki jo izločajo tolerantne glive in pri tem nastane netopen in zato za glive nestrupen bakrov oksalat. V kolikor je v zaščitnem pripravku poleg Cu prisoten še etanolamin, nastanek netopnega bakrovega oksalata ni mogoč. Opazili smo še veliko podobnost med glivnim razkrojem lignina in fotodegradacijo lesa. Menimo, da igrajo bakrove spojine v teh procesih podobno vlogo. Domnevamo, da v obeh primerih Cu(II) spojine lovijo proste radikale in se pri tem reducirajo v Cu(I) obliko. Kot obetavna, se je izkazala tudi možnost zaščite lesa le z vodno raztopino etanolamina, brez bakrovih soli.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [M. Humar], 2002Language - slovenianCOBISS.SI-ID - 914313
Author
Humar, Miha
Other authors
Petrič, Marko, 1962-
Topics
Les |
Zaščita |
Bakrove spojine |
Disertacije |
Glive |
Baker |
Rezistenca |
Disertacije |
lesarstvo |
zaščita lesa |
fungicidi
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Humar, Miha | 19106 |
Petrič, Marko, 1962- | 00395 |
Source: Personal bibliographies
and: SICRIS
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