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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Wood Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Wood Science Technology
Editor in Chief :
Volume & Issues
Volume 31, Issue 6 - 00 2003
Volume 31, Issue 5 - 00 2003
Volume 31, Issue 4 - 00 2003
Volume 31, Issue 3 - 00 2003
Volume 31, Issue 2 - 00 2003
Volume 31, Issue 1 - 00 2003
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Studies on Biological Activity of Wood Extractives (X) - Antifungal Compounds of Hovenia dulcis -
Choi, Yun-Jeong ; Lee, Hak-Ju ; Lee, Sung-Suk ; Choi, Don-Ha ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 1~9
Antimicrobial activities of plant extractives were investigated to develop a natural fungicide. Two stilbenoids and five flavonoids were isolated from wood extractives of Hovenia dulcis (Rhamnaceae) which had been selected due to its high antifungal activity among the tested species. The chemical structures of isolated compounds were determinded as : 5-hydroxy-7-methoxyflavone, 5,7-dihydroxy-flavone (chrysin), 5,7-dihydroxyflavanone (pinocembrin), 3,5,7-trihydroxyflavanone (pinobanksin), 3,4',5,7-tetrahydroxyflavanone (aromadendrin), 3-hydroxy-5-methoxystilbene and 3,5-dihydroxystilbene (pinosylvin) on the basis of Mass and NMR spectroscopic data. According to the results of antifungal test, 3-hydroxy-5-methoxystilbene was evaluated as the strongest antifungal compound among the tested compounds and next were pinocembrin and pinosylvin, but those also had high hyphal growth inhibition activities against C. parasitica, T. versicolor, T. palustris and T. viride. However, pinobanksin, 5-hydroxy-7-methoxyflavone, chrysin and aromadendrin showed very low antifungal activity. In this regard, it could inferred that high antifungal activity of wood extractives of H. dulcis were derived from 3-hydroxy-5-methoxystilbene, pinocembrin and pinosylvin, respectively.
Determination of Trend of a Radial Distribution of Moisture Content within a Log Cross Section by Oven-Drying of Cirmcumferential Slices - For some of domestic hardwoods -
Lee, Nam-Ho ; Li, Cheng-Yuan ; Choi, Jun-Ho ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 10~15
This study was carried out to investigate a radial distribution of moisture contents(MCs) within a log cross section(LC) during oven-drying of circumferential slices cut from some of domestic hardwoods LCs. For zelkova, the slices from sapwood and from transition part already reached to below hygroscopic range at 30% in average MC, whereas the innermost slice represented about 40% MC. A moisture gradient between the innermost slice and the adjacent slice from a cherry LC became severer with drying times. For castor aralia, the green MC for heartwood slices was approximately 23% higher than that for sapwood slices, and the similar moisture gradient still lasted until average 15% MC during oven-drying. For Chinese mahogany, the MCs of the mixed slices and the innermost slice were lower than those of the slices cut from the other parts during all over drying stage.
Chemical Analysis and Isolation of Antibacterial Compound from Ulmus Species (II) : Isolation and Chemical Structure of Antibacterial Compound
Kim, Chang-Soon ; Lee, Jung-Myoung ; Choi, Chang-Ok ; Park, Soung-Bae ; Eom, Tae-Jin ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 16~21
The methanol extractives from root bark of Ulmus davidiana var japonica nakai were fractionated with n-hexane, ethyl ether, ethyl acetate and waster, the water soluble fraction was also fractionated with silicagel column chromatograhy. The chemical structure of purifided compounds were identified with UV, IR,
-NMR spectra and the antibacterial activities also were investigated. Two different antibacterial compounds (compound A and B) were fractionated with silicagel chromatography and TLC. Compounds B was identified as a catechin rahmnoside. The both of compounds had antibacterial activity on Staphylococcus aureus and Salmonella typhimurium.
Properties of Particleboard Made from Pinus densiflora Thinning Log with Extended Urea-Formaldehyde Resin Adhesive
Oh, Yong-Sung ; Kwak, Jun-Hyuk ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 22~26
Particleboards (PBs) were made from Pinus densiflora thinning particle with urea-formaldehyde (UF) resin added casein and soybean as extender. The performance test results of the PB made showed that Pinus densiflora thinning log was suitable raw material for PB. As the extender addition in the UF resin was increased, the mechanical performance of the PB, bonded with the extended UF resin, were significantly decreased. However, casein and soybean can be used up to 15% and 20% of the UF resin solids respectively.
Air-Drying Curve and Moisture Content Distribution of Softwood Square Timber
Jung, Hee-Suk ; Lee, Chul-Hyun ; Kang, Wook ; Eom, Chang-Deuk ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 27~31
This paper presents the results of air-drying processes and mositure content (MC) distribution of red pine (P. densiflora) and Japanese larch (L. leptolepis) square timber with 14 cm and 16.5 cm of face size, respectively. The air-drying rates of square timber were comparatively high during the first 8 weeks, after that gradually decreased. The time to air dry square timber from initial MC to specified MC of 18 percent required about 26 weeks for 14.0 cm and 32 weeks for 16.5 cm square of red pine, and 32 weeks for 14.0 cm and 48 weeks for 16.5 cm square of Japanese larch. The longitudinal- and transverse MC distribution of these air-dried squares showed slight moisture gradient. The effect of face size on moisture gradient of Japanese larch square was more pronounced comparing with red pine one.
Studies on Biological Activity of Wood Extractives (XI) - Compounds from Heartwood of Taxus cuspidata and Their Antioxdative Activities -
Lee, Hak-Ju ; Lee, Sung-Suk ; Choi, Don-Ha ; Kwon, Yeong-Han ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 32~40
Antimicrobial and antioxidative activities of heartwood extractives of domestic species were investigated to develop a natural fungicide or preservative. Four lignan derivatives and one taxane were isolated from heartwood of Taxus cuspidata which has been selected due to its high antioxidative activity among the tested species. The chemical structures were identified as : taxusin, isolariciresinol (4, 4', 9, 9'-tetrahydroxy-3', 5-dimethoxy-2, 7'-cyclolignan), lariciresinol (4, 4', 9-trihydroxy-3, 3'-dimethoxy-7, 9'-epoxylignan), taxiresinol (3, 4, 4', 9-tetrahydroxy-3'-methoxy-7, 9'-epoxylignan) and isotaxiresinol (3', 4, 4', 9, 9'-pentahydroxy- 5-methoxy-2, 7'-cyclolignan) on the basis of spectroscopic data and their chemical correlations. According to the results of free radical scavenging activity, isolariciresinol, lariciresinol and isotaxiresinol showed higher radical scavenging activity than those of
-tocopherol and butylated hydroxytoluene (BHT), the strongest natural and synthetic antioxidants. However, taxusin did not show any free radical scavenging activity. In this regard, it could inferred that high antioxidative activity of extractives of T. cuspidata was derived from isolariciresinol, lariciresinol and isotaxiresinol.
Change of Surface Temperature in Woodceramics Made from MDF(II)- Effect of Impregnation Rate and Burning Temperature -
Oh, Seung-Won ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 41~45
In this study, woodceramics were made from MDF with various resin impregnation rate. To investigate the change of surface temperature of woodceramics, the impregnated MDF was burned at the temp. 600, 800, 1,000,
. Surface temperature of woodceramics was increased as impregnation rate and burning temperature was increased. The specimen burned at
was lower than others. Change of temperature under given temperature increased as time passed and it showed more increased in temperature at burning temperature of
. Change of surface temperature increased when floor temperature increased and the temperature was
in floor temperature of
specimen. The decent in surface temperature of woodceramics was the fastest decrease at the burning temperature of
Removing Sapstain of Radiata Pine by Bleaching
Kim, Gyu-Hyeok ; Kim, Hyung-Jun ; Ra, Jong-Bum ; Kim, Jae-Jin ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 46~51
The feasibility of using bleaching treatments for removing fungal stain was evaluated on heavily stained raiadta pine sapwood. Sodium chlorite and sodium hypochlorite appeared to destain fungal discoloration by providing proper treatment conditions (chemical concentration, treatment temperature, and treatment time), while hydrogen peroxide did not remove fungal stain under the bleaching regimes evaluated. The addition of sodium silicate and sodium hydroxide in the hydrogen peroxide solution as a buffer could remove fungal discoloration completely; however, the color of wood surface turned faint green after bleaching, thereby reducing the lightness of bleached samples. The results suggest that hydrogen peroxide bleaching could be a feasible method for removing fungal discoloration of stained radiata pine sapwood, although further research is needed to solve the problem of color change after bleaching. Also, further tests under field conditions are recommended.
Physical Properties of Liquid Ammonia Wood for Bending
Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 52~60
The physical properties of small hardwood and softwood specimens treated with liquid ammonia were investigated. The specimens treated for 4 or 18 hours were compared with the controls. The EMCs of the liquid ammonia treated specimens were higher than those of the controls when conditioned at the same humidities. However once oven-dried they didn’t show any significant differences in EMCs. With the increase of liquid ammonia treatment time specimens shrank in radial and tangential directions, but not in longitudinal direction. As liquid ammonia treatment time increased the ultrasonic velocities of specimens decreased and their densities increased, thus their dynamic MOEs decreased. For chestnut specimens the presteamed were more plasticized than the liquid ammonia treated. Incising on the surfaces of specimens didn't improve liquid ammonia permeability in both hardwoods and softwoods. Liquid ammonia treatment was very effective for plasticizing 5 mm thick softwoods. Relative dielectric constants and thermal conductivities were measured with both liquid ammonia treated and control specimens.
The Size Distribution of Free Water Paths in Heartwood of Softwood by Centrifugal Method - The Difference between Earlywood and Latewood -
Chun, Su-Kyoung ; Park, Jong-Su ;
Journal of the Korean Wood Science and Technology, volume 31, issue 1, 2003, Pages 61~70
The size distribution of the free water paths between earlywood and latewood for six species in the heartwood of softwoods was estimated from the amount of dehydrated free water under various centrifugal fields, such as 2,200, 3,300, 4,800 and 6,900 rpm. The centrifugal method is based on the concept that water movement occurs by the balance of centrifugal force and water potential by meniscus. Water stops where the pressure differential is zero. In the centrifugal field, only two factors affect water movement in wood, that is, centrifugal force and water potential. Also, the water permeability was evaluated from the relationship between the water saturation ratio after the centrifugal treatment and the measure of water potential in specimen. The results showed that Cryptpmeria japonica had clear peaks at 0.70
m in earlywood and at 0.50
m in latewood. Tsuga sieboldii and Larix kaemferi had peaks at 0.50 and 0.30
m in both earlywood and latewood, respectively. Abies firma showed peaks at 0.70
m in earlywood and at 0.30
m in latewood. The water permeability of earlywood was higer than that of latewood for all softwoods except Pseudotsuga menziesii.