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Vpliv staranja na strukturne lastnosti lesa hrasta : diplomsko delo = Effect of ageing on structural properties of oak wood : B. Sc. thesisBelec, AlenRaziskali smo strukturne in kemijske spremembe v jedrovini lesa hrasta (Quercus sp.) povezane s staranjem. Vzorčili smo konstrukcijski les različne starosti iz več objektov v Sloveniji. Starost lesa ... smo določili dendrokronološko, strukturne in anatomske lastnosti pa s svetlobno mikroskopijo (svetlo polje, polarizirana svetloba, epi-fluorescenca) ter z infrardečo spektroskopijo s Fourierjevo transformacijo (FT-IR spektroskopijo). Potrjena splošna vizualno temnejša barva starejše hrastove jedrovine je bila med drugim odvisna od variabilne anatomske lesne zgradbe, z značilnim vplivom deležev kompleksov traheid, trahej, libriformskih vlaken in trakov. S FT-IR določena deleža hemiceluloz in lignina sta se primerjalno z osnovnimi lesnimi komponentami v procesu staranja hrastovine zmanjšala. Zmanjšanje deleža hemiceluloz je bilo statistično značilno, zmanjšanje deleža lignina pa neznačilno. Z uporabo polarizirane svetlobe smo v procesu staranja hrastovine zaznali tudi degradiranje celuloze. Pri vzorcu subfosilnega lesa, starem več kot 600 let, ki se je ohranil v z vodo napojenem stanju, pa smo z uporabo vseh tehnik zaznali povečan delež lignina ter zmanjšan delež celuloze in hemiceluloz. Raziskava je pokazala, da so spremembe v nekaterih podobno starih vzorcih v procesu staranja različni, kar pripisujemo variabilnim (in delno nepoznanim) pogojem izpostavitve lesa tekom uporabe.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [A. Belec], 2017Language - slovenianCOBISS.SI-ID - 2811273
Author
Belec, Alen
Other authors
Čufar, Katarina |
Straže, Aleš |
Merela, Maks
Topics
hrast |
Quercus sp. |
les |
staranje |
svetlobna mikroskopija |
infrardeča mikroskopija |
oak |
Quercus sp. |
wood |
ageing |
light microscopy |
infrared spectroscopy
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Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 1 cop.
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
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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Belec, Alen | ![]() |
Čufar, Katarina | 02937 |
Straže, Aleš | 18149 |
Merela, Maks | 24676 |
Source: Personal bibliographies
and: SICRIS
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