Linear Expansion and Durability of a Composite Boards (MDF Laminated Using Three Selected Wood Veneers) against Drywood Termites

Economical use of larix (larch) boards (grade 3) in industries is lower than that of imported hardwood; thus, studies have been conducted toward performance improvement of larix boards. Herein, flexural modulus of larix board samples laminated with wood adhesives polyurethane resins, poly (vinyl acetate) resins, phenol-resorcinol-formaldehyde resins, melamineformaldehyde resins, and urea-formaldehyde resins was compared with that of the samples bonded with adhesives reinforced with mesh-type basalt fibers. Moreover, the flexural moduli of the laminated samples bonded by mesh-type basalt fibers were compared with those of reinforced samples. The results showed that boards laminated with polyurethane and urea-formaldehyde resin adhesives had higher flexural modulus than those without the lamination. In particular, the increase in the flexural modulus was relatively significant for the 2-and 3-ply board structures laminated with polyurethane adhesives compared to those with reinforcement. The 3-ply board structure without reinforcement had the highest flexural modulus when the urea-formaldehyde resin adhesive was used.

Section: Flexural Modulus Of Larch Boards Laminated Bymentioning

confidence: 99%

Section: Flexural Modulus Of Larch Boards Laminated Bymentioning

confidence: 99%

Flexural Modulus of Larch Boards Laminated by Adhesives with Reinforcing Material

LEE¹,

Oh²

2023

“…Concerning negative reactions to wood, such as "logging" and "expensive," it is vital to shift public opinion via publicity that wood functions as a carbon storage and is a sustainable recycling resource (Lippke et al, 2011). Furthermore, for negative perceptions of wood utilization such as "old material," "difficulty in management," and "chemical treatment," publicity is required to improve negative perceptions by utilizing research results such as strengthening the effect of preservative treatment of wood products (Cahyono et al, 2020;Lee et al, 2020;Priadi et al, 2020) and toxicity analysis of chemicals such as preservatives and flame retardants used in wood.…”

Section: Table 2 Continued Classification Detailsmentioning

confidence: 99%

Investigation on the Awareness and Preference for Wood Culture to Promote the Values of Wood: III. Living Environment and Trend of Wood Utilization

Han¹,

YANG²,

Lee³

2022

Improving public awareness of wood is crucial for expanding the use of wood and establishing a wood culture. In this study, the environment and trends of the public's wood utilization were analyzed using a questionnaire survey and online text mining at a time when eco-friendly practices are gaining popularity. As a result of reducing climatic and environmental concerns and its positive physical and psychological effects, the use of wood is predicted to rise in areas intimately connected to everyday living, such as wood furniture, wooden structures, and interior materials. Nonetheless, there was a negative awareness that wood was expensive, difficult to maintain, and associated with deforestation. The correlations between wood-related search terms on major Korean portal sites were analyzed and categorized into five groups: Wooden architecture, cultural education, woodworking, wood industry, and wood policy. As a building material, wood was seen as more traditional and friendly than reinforced concrete and stone. Eighty-six percent of respondents expected to utilize wood as a building material in the future, regardless of whether the wood is domestically produced or imported. Sixty-five percent responded favorably about the effects of wood on the health of wooden home inhabitants. It is believed that both active publicity and quantifiable value analysis of human and environmental friendliness are required to increase pro-environment awareness of wood utilization.

“…Termites are wood-eating pests (Arinana et al, 2022;Su and Scheffrahn, 2000). Since termites damage wooden buildings, many studies have been conducted to control them in various ways (Adfa et al, 2020(Adfa et al, , 2023Arsyad et al, 2020;Cahyono et al, 2020;Ella Nkogo et al, 2022;Im and Han, 2020;Lee et al, 2020;Oramahi et al, 2022;Priadi et al, 2023). However, they also serve as ecological suppliers providing various nu-trients, including nitrogen compounds (Govorushko, 2019;Lobry de Bruyn and Conacher, 1990).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Low-Temperature Enzymatic Reactions through Heterologous Expression and Functional Analysis of Two Beta-Glucosidases from the Termite Symbiotic Bacterium Elizabethkingia miricola Strain BM10

LEE,

KIM

2023

Lower termites need symbiotic microbes for cellulose digestion. Elizabethkingia miricola strain BM10 has been proposed as a symbiotic microbe that assists in low-temperature digestion and metabolism of Reticulitermes speratus KMT1, a termite on Bukhan Mountain, Seoul, Korea. In E. miricola strain BM10, β-glucosidase genes expressed at 10℃ were identified, and the psychrophilic enzymatic characteristic was confirmed by heterogeneously expressed proteins. Crude β-glucosidase in the culture broth of E. miricola strain BM10 showed specific enzymatic properties, and its substrate affinity was 4.69 times higher than that of Cellic CTec2. Among the genes proposed as β-glucosidase, two genes, bglB_1 and bglA_2, whose gene expression was more than doubled at 10℃ than at 30℃, were identified. They were heterogeneously expressed in Escherichia coli and identified as psychrophilic enzymes with an optimal reaction temperature of about 20℃-25℃. In this study, E. miricola strain BM10, a symbiotic bacterium of lower termites, produced psychrophilic β-glucosidases that contribute to the spread of the low-temperature habitat of a lower termite, R. speratus KMT1.