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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 211 to 220 of 4349 (0.045 seconds)Spelling suggestions: "subject:"Of word""
| 211 |
A study of Eimeria species infecting the wood mouse (Apodemus sylvaticus Linnaeus, 1758) with special reference to Eimeria apionodes Pellerdy, 1954Ibrahim, S. A. January 1987 (has links)
No description available.
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| 212 |
The ecology of wood mouse (Apodemus sylvaticus) populations in contrasting farmland habitatsHavers, Steven John January 1989 (has links)
No description available.
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| 213 |
A mechanistic study of antagonism of the biocontrol agent Trichoderma against wood decay basidiomycetesSrinivasan, Usha January 1993 (has links)
No description available.
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| 214 |
The electrokinetic aspect of cellulose fibres used in the papermaking processSinden, Jane January 1997 (has links)
No description available.
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| 215 |
Life history evolution in the death-watch beetle Xestobium rufovillosum DeGeerMenendez, Guy Tremar January 1990 (has links)
No description available.
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| 216 |
An analytical use of stress waves for the detection of defects in treesLawday, Geoffrey January 1998 (has links)
No description available.
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| 217 |
The detection of wood by the marine borers Limnoria spp. (Limnoridae:Isopoda) during their migrationHenderson, Suzanne Meryl January 1998 (has links)
No description available.
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| 218 |
Characterisation and quantification of wood extractives and their impact on pitch.Moodley, Prinisha. January 2011 (has links)
The aims of this study were to characterise and quantify wood extractives in E. grandis and E.
nitens and determine the impact of wood extractives on pitch formation. Initially a comparison
was made with individual solvent abilities to determine whether the polarity index plays a role
in the amount of extracts being removed. After this different methods were used to determine
the extractive amounts. These methods included hot water/ethanol-toluene, hot
water/acetone and followed by acetone only. Analyses such as UV-Vis, acidolysis and HPLC
were carried out to determine the presence of lignin and sugars in the extracts and sawdust
respectively. Lastly GC and GC-MS was performed to characterise and quantify extractives
present in the extracts from the different methods.
The results showed that acetone is the preferred solvent as it removes higher amounts of
extractives than ethanol-toluene. There is also a higher amount of extractives in E.grandis
sawdust than in the E. nitens sawdust and pitch sample. There seems to be more fatty acids
and sterols in the E. nitens sawdust sample extracted the using acetone (no hot water
extraction) method while hydrocarbons are extracted more in E. grandis using the same
method.
It was found after GC-MS analysis that fatty acids tetradecanoic acid methyl ester and
hexadecanoic acid methyl ester and hydrocarbon 1-Octadecene were common to both
species.
The common compounds in the pitch and sawdust of E. nitens are heptadecanoic,
octadecanoic, tetradecanoic and tridecanoic acid methyl esters, gamma and beta sitosterol
and Stigmasterol, 1-docosene and lastly 1-nonadecene hence these compounds are more
likely to cause pitch.
After analysis using UV analysis and acidolysis there was indication that there were lignin
breakdown products present in the wood extracts, in minimal amounts. HPLC indicated no
sugars present in the extracts.
It is concluded that GC and GC-MS are the recommended analytical tools in characterising
and quantifying wood extractives in E. grandis and E. nitens. All extractives in both species
were quantified and identified using GC and GC-MS respectively. / Thesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2011.
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| 219 |
Juvenile wood formation in relation to crown size in Corsican pineAmarasekera, Hiran S. January 1990 (has links)
No description available.
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| 220 |
Kinetics of the wood-acetic anhydride reactionDunningham, Elizabeth A. January 2003 (has links)
No description available.
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