Your search resulted in 196 documents. Displaying 25 entries per page.
Binder-free, fire-resistant, light-weight fiberboard materials encrusted with expandable graphite and borax
2024 - IRG/WP 24-20714
…in water fire retardants. This study aimed to manufacture cellulose-based composite boards that effectively protect against fire. The manufacturing process encompasses additive-cellulose fiber blending, flotation, moisture extraction, and final product drying stages. The fire properties of the materials were…
W Perdoch, W Grześkowiak, B Mazela
Isolation of the microbiota from wood decay insects and some of their enzymatic activities
2023 - IRG/WP 23-11014
…organisms have the ability to degrade wood components (cellulose, hemicellulose and lignin) by enzymatic capacities, but these enzymes can belong to the proper organism, or to the associated microbiota. The identification of the microorganisms, as well as their role in the digestion of many substrates not always…
M T Troya, F Llinares, J Arranz, S Izpura-Luis, S M Santos, L Robertson
Morphological observation of wood at the early stages of decay in brown rot and white rot
2023 - IRG/WP 23-11020
…and decompose all main component of wood cell wall such as cellulose, hemicellulose and lignin. In contrast, brown-rot fungi are known to cause rapid strength loss of wood and decompose cellulose and hemicellulose with the chemical modification of lignin. However, the knowledge of the decay mechanisms at the early…
R Tsukida, T Hatano, Y Kojima, Y Horikawa, S Nakaba, R Funada, M Yoshida
Efficacy of a wide-spectrum plant bio-based anti-termite product - Laboratory trials
2023 - IRG/WP 23-11024
…been evaluated through: (1) laboratory screening tests on cellulose paper against Reticulitermes flavipes, (2) laboratory tests according to the guidelines of EN117 against Coptotermes gestroi and Prorhinotermes canalifrons, and, (3) soil treatment tests against C. gestroi. This work reports the efficacy results…
M-F Thévenon, F Chopinet, J Vuillemin, A Robert, S Lafay, D Messaoudi
Potential of plant polyphenol extracts in pesticide formulations against Xylophagous insects
2023 - IRG/WP 23-30790
…fed via trophallaxis from the workers which degrade the cellulose from wood. It is of great economical importance to ascertain the efficacy of preservatives against wood decay organisms in order to extend wood products service life. Remedial chemical product applications are used primarily as wood treatments to…
K Ruel, D Messaoudi, J-P Joseleau
Control of Asian subterranean termites Coptotermes gestroi (Blattodae: Rhinotermitidae) by a new generation bait system with vegetal extracts-diflubenzuron mixture
2023 - IRG/WP 23-30797
…cts-Diflubenzuron mixture. The neutral matrix based on pure cellulose and vegetal extracts, to demonstrate good nutritional value for termites compared to the commercial neutral matrix.
F Chopinet, D Messaoudi
Failure characteristics of thermally modified poplar wood subjected to mechanical tests
2023 - IRG/WP 23-40983
…30 min. The increases in MOE may be related to changes in cellulose crystallinity. Mass losses increased with increasing temperature exposure while moisture absorption decreased as expected with longer thermal exposure. The degree of polymerization remained similar for samples exposed up to 170 °C and then…
E Bari, M Ghorbanian Far, N Moradi, J J Morrell, G Daniel, B Mohebby, R Hosseinpourpia, M Humar
Molecular dynamics investigation of wood modification with furfuryl alcohol
2022 - IRG/WP 22-40931
…the structural characteristics and the interaction of cellulose and lignin with furfuryl alcohol for explaining the wood modification process. A single chain of cellulose polymer model and a softwood lignin model was considered to represent cellulose and lignin polymers. The obtained radial distribution function…
V Ponnuchamy, J Sandak, A Sandak
Chemical modification of cellulose nanofibrils for tailoring properties of composites
2022 - IRG/WP 22-40934
…complete biodegradability and excellent properties, cellulose is one of the most promising materials for the production of bio composites, as well as one of the most promising fillers for biodegradable polymer composites. This is also true for nanocellulose. A large number of hydroxyl groups on the surface of…
I Poljanšek, J Levanič, V Ž Bogataj, V Vek, P Oven
The influence of thermal modification and surface charring to different levels on wettability of Norway spruce wood
2022 - IRG/WP 22-40942
…and charring of the wood resulted in dehydration of cellulose and hemicelluloses and promoted the presence of chemical units typical of lignin. The roughness of the natural and thermally modified wood surface increased with the increased level of charring. The surface wettability study showed that a higher…
J Žigon, C Gerardin, M E P Wålinder, P Gerardin
Biocomposites based on PVA, cellulose nanofibrils and tannic acid
2022 - IRG/WP 22-40957
…based on a polyvinyl alcohol (PVA) with the addition of cellulose nanofibrils (CNF) as a reinforcing component and with the addition of the biologically active tannic acid (TA) were prepared. The influence of different additions of CNF and TA in the polymer matrix PVA on the mechanical properties, improvement of…
U Osolnik, V Vek, I Poljanšek, Poven
Production of exraxellular hydrogen peroxide and oxalic acid by brown-rot fungus Poria placenta
1995 - IRG/WP 95-10112
…peroxide and oxalic acid by Poria placenta was studied on crystalline cellulose, amorphous cellulose and glucose media. Hydrogen peroxide and oxalic acid were clearly produced on culture media containing either amorphous or crystalline cellulose. Hydrogen peroxide and oxalic acid were formed simultaneously and…
A-C Ritschkoff, M Rättö, J Buchert, L Viikari
Relationship between degradation of wood, cellulose or lignin-related compounds and production of hydroxyl radical or accumulation of oxalic acid in cultures of brown-rot fungi
1994 - IRG/WP 94-10062
The degradation activities of brown rot fungi against wood, cellulose, and lignin-related compounds were measured in cultures containing glucose or wood as a carbon source. Also the activities of one-electron oxidation and hydroxyl radical production and the amount of oxalic acid present in the cultures were measured.…
S Itakura, T Hirano, H Tanaka, A Enoki
Solid state NMR study on pine wood degraded by brown rot fungus Gloeophyllum trabeum
1994 - IRG/WP 94-10067
…was no evidence for preferential degradation of the noncrystalline cellulose which accounted for about 4% by weight of the wood. Loss of partly ordered cellulose on crystal surfaces exceeded the loss of crystal-interior cellulose. The proportion of the monoclinic ¦-beta crystalline form increased. The results…
Yoon Soo Kim, R Newman
Elucidation of reactive sites of wood modified with acetic anhydride: Insights from density functional theory calculations
2020 - IRG/WP 20-40892
…(DFT) was employed to investigate the interaction of cellulose and lignin with acetic anhydride for explaining the wood modification process. Atoms in molecules (AIM) and reduced density gradient (RDG) along with non-covalent interaction (NCI) plots were used to analyse the intermolecular bonding…
V Ponnuchamy, A Sandak, J Sandak, R Herrera Diaz
Difference of wood decay manner between brown-rot species
2019 - IRG/WP 19-10938
…analysis. In the analyses, the differences in the cellulose crystallinities and infrared spectral patterns were observed between Polyporales white-rot and brown-rot fungi. Multivariate analysis of the infrared spectroscopy data also suggested the difference of chemical component between wood blocks decayed…
R Kondo, Yo Horikawa, S Nakaba, K Ando, M Yoshida
The role of oxidation in wood degradation by brown-rot fung
1992 - IRG/WP 92-1562
Brown-rot fungi are suggested to degrade cellulose by oxidation with hydrogen radicalsformed eg. in the conversion of hydrogen peroxide in the Fenton type reactions. The stuctural changes in the holocellulose in wood induced by Fenton's reaction on wood components are very similar to those…
A-C Ritschkoff, J Pere, J Buchert, L Viikari
Enhancing Our Understanding of Brown Rot Mechanisms through Catalytic Pretreatment and Cellulase Cocktail
2018 - IRG/WP 18-10909
…were able to solubilize a majority of both the lignin and cellulose of wood at room temperature, using a hydrogen peroxide concentration of only 1%. Using a single pulse of the CMF system as a pretreatment allowed more wood residue to be retained, and enzymatic action on this pretreated wood was enhanced compared to…
S Tabor, L Orjuela, D Contreras, G Alfredsen, J Jellison, S Renneckar, B Goodell
Understanding of the effect of ancestral and natural saltwater treatment on durability, fibers densification and chemical modification of palm wood
2018 - IRG/WP 18-10921
…than that of native palm wood. Extractives, lignin and cellulose contents are slightly more abundant in the control samples except for the hemicelluloses which are more abundant in the treated palm wood sample. Additional analyses conducted with an ICP-AES 700 Agilent device, evaluating the mineral compositions…
M T Elaieb, A Namsi, M Tella, M-F Thévenon, K Chandelier
Reactivity of alkoxysilanes with cellulose and lignin in presence of catalysts
2018 - IRG/WP 18-40831
…Samples were measured by using FT-IR. It turned out that cellulose was not so readily reactive to alkoxysilanes as lignin. However, cellulose can react with silanols, which are the product of hydrolysis of alkoxysilanes. For this purpose, catalysts were used to enhance the durability of the interactions between…
J Siuda, W Perdoch, B Mazela, M Zborowska
Termite species associated with processed wood in South America
2018 - IRG/WP 18-10934
…important role in the decomposition of organic matter of cellulose origin and in the modification and quality of soils. Some species are xylophagous, and therefore are considered an important urban pest due to their ability to attack not only wooden building structures but also synthetic materials such as PVC,…
C Jorge, M Ibáñez
Old and new facts on the dry rot fungus Serpula lacrymans
1991 - IRG/WP 1470
…wood moisture is above 55%. Serpula Iacrymans degrades crystalline cellulose. The intensive production of extracellular oxalic acid is neutralized by calcium and iron. There is considerable variation among the strains with regard to factors such as growth rate, wood decay and response to preservatives. Possible…
O Schmidt, U Moreth-Kebernik
The First Description of Soft-rot Cavity in Waterlogged Archaeological Woods by a Japanese Wood Anatomist Prof. F. Onaka in 1935
2017 - IRG/WP 17-10885
…by cavities within secondary cell walls align along the cellulose microfibrils. Our recent literature search revealed, however, that Prof. F. Onaka in Kyoto University described the soft rot cavities in the waterlogged archaeological woods in detail from the year of 1935 on, almost 20 years earlier than Savory.…
Yoon Soo Kim, K Yamamoto
Effects of exposure time on detection of the behavior of white-rot fungi on Oriental beech wood properties
2017 - IRG/WP 17-10902
…chemical analysis indicated that P. ostreatus can degrade cellulose in addition to the normal (lignolytic) degradation. Overall, the current study suggests that some fungi are able to change decay strategies by changing their living condition.
E Bari, D D Nicholas, K M Ohno
Release of Copper from Pressure Treated Wood
2016 - IRG/WP 16-20584
…is not in free copper form, but rather attached to wood cellulose substrate. The results from wipe test indicate that both MCA and its soluble counterpart CA released approximately the same amount of copper with each contact. In both cases, the level of copper released high initially and then levelled off after…
Jun Zhang, J Horton