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이필우,권미,정연집 서울대학교 농과대학 농업개발연구소 1992 서울대농학연구지 Vol.17 No.1
This paper was prepared to offer wood identification key for coniferous 28 species, belong to 14 genera and 5 families, grown in Korea mainly by microscopical diagnostic features. Identification key for coniferous woods grown in Korea was made as follows 1. Resin canals present ··························2 1. Resin canals absent ·························· 8 · 2. Epithelium cells thick walled ····················3 · 2. Epithelium cells thin walled·····················5 3. Early-latewood transition gradual ··················· 4 3. Early-latewood transition abrupt·················Larix sp 4. Cross field pits piceoid ··········Picea Koraiensis, P. jezoensis 4. Cross field pits piceoid and cupressoid ············Picea abies · 5. Ray tracheids prominently dentate ·················· 6 · 5. Ray tracheids non-dentate ······················ 7 6. Cross field pits windowlike ········Rinus densiflora, P. thunbergii 6. Cross field pits pinoid (lopsided)·····P.taeda, P.banksians, P. rigida 7. Early-latewood transition gradual ··············· P.strobus 7. Early-latewood transition abrupt ···· P.koraiensis, P.parviflora · 8. Longitudina parenchyma abundant ···················9 · 8. Longitudinal parenchyma wanting ·················· 14 9. End walls of longitudianl parenchyma cells nodular ·········· 10 9. End walls of longitudinal parenchyma cells smooth ···········13 10. Traumatic resin canals and prismatic crystals present·· ·Cedrus deodara 10. Traumatic resin canals and prismatic crystals absent ········ 11 11. Cross field pits cupressoid ····· ············Juniper sp. 11. Cross field pits taxodioid or both taxodioid and cupressoid ····· 12 12. End walls of ray parenchyma cells with indentures····Thuja orientalis 12. End walls of ray parenchyma cells lacking indentures Taxodium distichum 13. Cross field pits typical taxodioid··········Cryptomeria japonica 13. Cross field pits typical cupressoid ·········Chamaecyparis obtusa · 14. Early-latewood transition abrupt ··················15 · 14. Early-latewood transition gradual ················· 17 15. Ray tracheids present ·················· Tsuga sieboldii 15. Ray tracheids absent ························· 16 16. Prismatic crystals present··········Abies hollophylla, A. firma 16. Prismatic crystals absent ···········A. koreana, A. nephrolepis 17. Idioblasts containing druse crystals present·········Ginkgo biloba 17. Idioblasts containing druse crystals absent ··············18 18. Spiral thickenings double coil············· Torreya nucifera 18. Spiral thickenings not double coil············Taxus cuspidata
옻나무(Rhus verniciflua Stokes) 漆液溝의 解剖學的 特性
이필우,정연집 서울대학교 농과대학 농업개발연구소 1992 서울대농학연구지 Vol.17 No.2
The light microscopic anatomical characteristics of secretory canals in Rhus verniciflua Stokes grown in Korea were investigated. Secretory canals surrounded by 2-3 rows of concentric or more or less flattened secretory(epithelial) cells were distributed in secondary phloem and arranged in tangential bands. Radial and tangential diameter of canal were 30∼80㎛(average, 57㎛) and 40∼160㎛(average, 90㎛), respectively. Canal frequency, number of canals per 1㎟, was 5∼11(average, 7.85).
소나무 ( Pinus densiflora S . et Z . ) 압축이상재의 (壓縮異常材) 방사조직 특성에 관한 해부학적 연구
정연집(Youn Jib Chung),이필우(Phil Woo Lee) 한국산림과학회 1989 한국산림과학회지 Vol.78 No.2
This experiment was executed to investigate and compare qualitative and quantitative anatomical features in compression wood, opposite wood, and side wood formed in a bent stem, a straight branch, and an exposed horizontal root of Korean red pine(Pinus densiflora S. et Z.). The respective four discs containing compression wood taken at 20cm interval both in stem and branch as well as a disc containing well developed compression wood from horizontal root were analyzed. Percentage of compression wood and eccentricity showed decreasing tendency with the increasing distance in height direction of stem and length direction of branch. The qualitative anatomical features of compression wood appeared to differ from those of side and opposite wood in very gradual tracheid transition from earlywood to latewood, roundish tracheid shape on cross surface, tracheid distortion at tip on radial surface, existence of intercellular space, and helical cavity` in tracheid wall. And the differences in these qualitative features among the compression wood, opposite wood, and side wood became less intensive with the decreasing trends in percentage of compression wood and eccentricity. The quantitative anatomical features in compression wood also appeared to be wider in that respective widths of fusiform and uniseriate ray than those of opposite and side wood, but the heights of fusiform and uniseriate ray in compression wood were smaller than in opposite and side wood. The number of horizontal resin canal(fusiform ray) and uniseriate ray, however, showed no differences among the compression wood, opposite wood, and side wood. And the number of vertical resin canal in unit area, 4π㎟ of compression wood was fewer than that in opposite wood, whereas numerous vertical resin canals contained in a growth ring. These rays of compression wood seemed to be characterized by smaller height and wider width than those of opposite and side wood.
강춘원,정연집,강호양 한국가구학회 2019 한국가구학회지 Vol.30 No.3
Hygroscopicity and anistropicity are most important physical properties of wood. Wood shrinks with the loss of water and the dimensional shrinkages are different in the three directions. Anistropical shrinkage causes drying stresses and finally cracks in wood. Wood stabilizer penetrates into wood and prevent it from shrinking. Three wood stabilizers (products A and B, PEG-1000) are popular and available in global on-line market. Red pine disks of 5 cm thickness were soaked in these three wood stabilizer solutions. Absorption rate, drying rate, amount of retention and equilibrium moisture content were examined to compare their properties. For Product B and PEG-1000 green wood disks were soaked. Absorption rate of Product B was higher than PEG-1000 by 10 times. Drying rates of soaked wood disks in a cardboard box were 0.23, 1.13, and 3.2 g/day for Products A and B, and PEG-1000, respectively. Amount of retention based on oven-dry weight were 14.7, 23.1, and 32.6% for Products A and B, and PEG-1000, respectively. It was revealed by a chemical analysis that Products A and B are hydrotreated petroleum.