• Journal of the Korean Wood Science and Technology
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• v.43 no.6
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• pp.784-791
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• 2015

Polyethylene glycol (PEG) impregnation prevents a red pine disk from cross-sectional checking during drying. Percentage of PEG Retention (PPR) was measured by the experimental methods of aceton extraction and moisture conditioning in a saturated salt solution and the effect of acetylation on PEG impregnated wood was investigated. PPRs of the kiln-dried specimens were much higher than those of the air-dried by at least four times and within the kiln-dried specimens those of the sapwood were higher that those of the heartwood by two times. These results were confirmed by the moisture conditioning experiment. Acetylation increased the weights of the kiln-dried specimens much less than those of the air-dried. It was revealed that acetic anhydride solution eluted PEG-1000 in the specimens. It is concluded that kiln-drying is more effective than air-drying for the increase of PPR and that acetylation eliminates the difference between the kiln- and air-dried specimens.

• 보존과학연구
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• s.11
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• pp.221-233
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• 1990

4종의 상태가 좋은 그리고 2종의 열화된 수침 침엽수재(Pinus massoniana,Pinus.densiflora, Cunninghamia lanceolata, Crypto meria japonica)를 PEG400과PEG4,000용액으로 처리하였다. 모든 종이 안정화처리에 똑같게 반응을 보였다. 전체적으로 건전재나 약간 열화된 수침재는 PEG400 20%용액으로 처리한 결과 치수안정화가 달성되었다. PEG4,000의 50%용액으로 처리한 목재의 건조에 대한 수축은 심하게 열화된 목재에 대해 열화되지 않은 목재에서는 1/2에서 1/3정도 감소하였다. 엄격한 상관관계가 최적안정화를 위해 PEG와 목재의 밀도간에 존재한다. 최적으로 처리된 목재는 86%상대습도 이하에서는 축축하게 되지 않는다. PEG400과 PEG4,000으로 처리한 2단부함침이 황해에서 구조된 중국 정크선의 목재를 안정화시키는데 대해 추천된다.

• Journal of the Korean Wood Science and Technology
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• v.45 no.2
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• pp.139-146
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• 2017

This study was conducted to develop a new drying technology in order to quickly and massively dry bamboo tubes without crack and check. The bamboo tubes with the diameter of 45 mm - 68 mm had been impregnated in the solution of PEG-1000, and then were dried under room temperature and high temperature, respectively. The cracks occurred on all control specimens while no cracks were found on PEG treated specimens during drying at room temperature due to effect of PEG restraining the circumferential shrinkage of bamboo tube. But the drying period of this method was too long (200 days) compared to 10 hours of kiln drying. During fast high temperature drying, cracks occurred on all control specimens, but no cracks were found on PEG treated specimens, which could be accounted for more solidified PEG due to higher drying temperature and faster drying rate, and the tension set formed on the surface of bamboo tube in the early stage of drying owning to high drying temperature and low relative humidity. Thus, it is advised that PEG treated bamboo tube should be fast dried at high temperature in order to not only prevent crack or check in short drying period but also increase the dimensional stability of the products made of bamboo tubes.

• The Korean Journal of Mycology
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• v.16 no.4
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• pp.247-252
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• 1988

The uptake of isolated Lyophyllum ulmarium chromosomes by Ganoderma applanatum protoplasts was induced with polyethylen $glycol+CaCl_2+glycine$. Uptake products of chromosomes by protoplasts showed micro-and macrotransgenome type. The former was slowly growing and unstable, the latter was outgrowing and stable mycelial colonies which made thick hyphae of width and segregation of mycelial colony on GCM containing benomyl. A comparison of macrotransgenome type was using isozyme analysis of esterase. The enzyme pattern of two transformants was distinct in position and quantity compared with parents.

• Journal of Plant Biotechnology
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• v.39 no.2
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• pp.93-98
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• 2012

This study was conducted to evaluate effects of somatic embryos (SEs) induction with different kinds and concentrations of osmoticum, with gelrite and SEs germination with different abscisic acid (ABA) and embryogenic tissue lines (ETLs) in Japanese red pine (Pinus densiflora). In comparison of somatic embryos induction with different kinds and concentrations of osmoticum, the highest record (45/90 mg FW) was obtained from the treatment of 0.1 M maltose+3.75% PEG 4000. In addition, the higher one was also recorded from 0.2 M maltose (41 SEs), it turned out this treatment was also effective in induction of SEs with previous one. In effects of various gelrite concentrations for SEs production, no SEs were occurred in the treatment of 0.4 or 0.6% gelrite, however, the highest no. of SEs shown in 1.0% gellrite (41 SEs), and some comparable results were also marked with 0.8 (37.3 SEs) or 1.2% (39.7 SEs) gelrite. Therefore, SEs can be produced from above 0.8% concentration of gelrite. Finally, in comparison of SEs germination with different concentrations of ABA, ETLs, and AC, the best germination rates (45%) were obtained from the SEs derived from both concentrations of 150 and $200{\mu}M$ ABA in 06-6 ETL and when cultured on germination supplemented with 0.2% AC. When SEs were cultured on germination medium without AC, best germination rate (28.9%) came from the SEs which cultured on $250{\mu}M$ ABA in 06-6 ETL.