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물리적 처리에 따른 낙엽송 방부원주목의 표면할렬 방지효과
방성준 ( Sung-jun Pang ),오정권 ( Jung-kwon Oh ),이상준 ( Sang-joon Lee ),박준호 ( Jun-ho Park ),장성일 ( Sung-il Jang ),이전제 ( Jun-jae Lee ) 한국목재공학회 2017 목재공학 Vol.45 No.1
본 연구에서는 국산 낙엽송 방부원주목을 대상으로 물리적 처리(인사이징, 배할, 열기건조)에 따른 표면할렬 방지효과와 장기 사용연한 확보 가능성을 실험적으로 검토하였다. 표면할렬이 목재 내·외부의 급격한 수분경사로 인해 발생하기 때문에 본 연구에서는 국내 최저 평형함수율 조건[온도(2℃), 습도(44.6%)]에서 시험편이 평형함수율(8.6%)에 도달할 때까지 실험을 진행하였다. 물리적 처리에 따른 표면할렬 방지효과를 검토한 결과, 무처리 시험편(Type C)의 경우, 모든 시험편에서 약제 침투 깊이보다 깊은 할렬이 발생하여 장기 내부후성을 확보할 수 없는 것으로 나타났다. 한편, 약제침투도 개선을 위해 사용하는 인사이징 처리만으로도 시험편의 80%에서 약제침투깊이보다 깊은 표면할렬을 방지하는 효과가 있었다. 그러나 국내에서 할렬을 방지하고자 사용하는 배할 처리는 인사이징 처리에 비하여 약제침투깊이보다 깊은 표면할렬을 야기하였다. In this study, the surface check reduction effect of preservative-treated Korean larch round-wood was investigated by applying three physical treatments, such as incising, kerfing, and kiln-drying. Moreover, the possibility of long- term service life was also checked by comparing the depth of surface check and the penetration depth of preservative. A rapid gradient of wood moisture content between surface and center causes a surface check. Thus, the effect of reducing surface check was carried out at the lowest equilibrium moisture content (EMC) condition, temperature (2℃), humidity (44.6%), in outdoor locations in Korea until the test specimens reach to the 8.6% EMC. As a result, the preservative- treated specimens without incising, kerfing, kiln-drying (Type C) could not ensure the long-term service life due to a large surface check. Because the surface check depth of all specimens was deeper than the penetration depth of preservative. In case of the incising treated specimens (Type I), 80% of them, the depth of surface check was not deeper than the penetration depth of preservative. However, when a kerfing was additionally treated (Type B), a possibility of happening deeper surface check than penetration depth of preservative was increased rather than Type I.
鄭鎬三,吳正一,李圭植 한양대학교 의과대학 1984 한양의대 학술지 Vol.4 No.1
It was well documented that in the course of development of rat tibia in formation of cartilage model from the mesenchymal cells and subsequent ossification generally starts as early as 15-16th day of embryonic stage and that development of tibia completes by the 8-10th day after birth. Rather extensive studies have been made on the differention of cartilage cells, including their secretory activities of matrix and composition of matrix as well. However, there are still much to be clarified on the more precise feature of differentiation and growth of epiphyseal plates in the rat tibia. Therefore the present study was designed to explore differentiation of epiphyseal plate biochemically and histologsically at each developing stage of rat tibia. The albino of Wistar strain were used as experimental animal. And expreimental animals were sacrificed at 16, 18, 20th of fetal life and 2nd, 4th and 10th day of neonatal life. The epiphyseal plates were removed from tibia and were fixed in 10% formalin and 2% glutraldehyde-2.5% paraformaldehyde phosphate. The PAS-hematoxylin stain was carried out for the study of general development of tibia and alcian blue (1.0), alcian blue (2.%) and aldehyde fuchsin-alcian blue stains for the determination of mucopolysaccharide variations. Also, thin sections were prepared and stained with uranyl acetate and lead citrate stain for the ultramicroscopic study of chondrocytes and matrix of epiphyseal plates at different stages of development of rat tibia. The results obtained were as fokkows: 1. A small amount of acid unsulfated mucin was found in the matrix of epiphyseal plate as early as 16th day of fetal life. 2. On the 18th day of fetal life existance of acid mucin and sulfated mucin were recognized in the matrix of epiphyseal plate and thereafter they were increased in amount. 3. The acid mucin reached maximum level at 2nd day of neonatal life and thereafter sulfated mucin gradually appeared in the mathix of epiphyseal plate. 4. In the proliferative zone of tibia of 18day old embryo, secretary granules were deposited in the all membranes of chondrocyte. As the fetus grew, the namber and size of secreted granules were increased approprocial by increase in salfated mucin: And the rough endoplasmic reticulum in the chondrocytes was increased also. To summerize above results the acid mucin start to appear in the matrix of epiphyeal plate as ealry as 16th day of fetal life and later a part of acid mucin is changed to neutral sufated mucin, the secretary granules observed on the cell membrane of chondrocytes of 12 day old embryo seems to be sulfated mucin.