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Study of Active Water Absorption of Polystyrene-Based Ionomers
소인섭,김준섭 한국고분자학회 2020 Macromolecular Research Vol.28 No.10
The active water absorption behavior of poly(styrene-co-methacrylate) PSMANa and sulfonated polystyrene PSSNa ionomers was studied. On one hand, the acidic copolymers did not absorb water noticeably. On the other hand, the amount of water absorbed by the ionomer increased with increasing ion content. Especially when the ion contents of the PSMANa and PSSNa ionomers exceeded 6 and 10 mol%, respectively, the maximum amount of the water absorbed by the ionomers increased rapidly as the ion content increased. This indicated that the cluster-dominant ionomers exhibited stronger water absorption behavior, compared to the matrix-dominant ionomers. In addition, when the ion contents of the PSMANa and PSSNa ionomers were less than 6 and 10 mol%, respectively, the volume and shape of the bulk ionomers did not change significantly by the water absorption. Morphological studies on the soaked ionomers showed that the SAXS peak shifted to lower angles as the water uptake increased with increasing ion content of the ionomers, which was consistent with the results obtained by the swelling method.
李宗錫,蘇寅燮 濟州大學校 亞熱帶農業硏究所 1985 亞熱帶農業硏究 Vol.2 No.-
種子播種에 依하여 얻어진 春蘭의 根莖을 Murashige & Skoog 培地에 暗培養하였을 境遇, 生育과 植物體分化에 미치는 NAA와 BA의 效果는 0.2∼10m/ℓ 水準까지 BA의 濃度가 높아질수록 根莖의 分枝數가 增加되었고 NAA의 濃度가 높아질수록 根莖의 길이가 增加되었다. 한편 暗狀態에서도 shoot와 뿌리가 分化되었는데 BA의 濃度가 높아질수록 shoot의 分化數가 增加되었으며 NAA 10mg/ℓ添加는 뿌리를 發生시켰다. 根莖의 生育 및 植物體 分化에 미치는 NAA와 BA는 混合處理하는 것이 效果的이었다. Effects of NAA and BA added to the Murashige & Skoog medium on the growth of Cymbidium virescens rhizome propagated from seed germination aseptically, and on the shoot and root formation from the rhizome were studied in continuous darkness. With increasing concentration from 0.2 to 10mg/ℓ, BA promoted proliferation of the rhizome tips, and NAA elongated the rhizomes. Although the rhizomes cultured in complete darkness, shoot induction was stimualted with incresing of BA concentration, and root was induced with addition of 10mg/ℓNAA. NAA combinated with BA was more effective rhizome growth and plantlet differentiation.
Virus 無毒株 生産을 위한 안개초의 生長點 培養에 關한 硏究
蘇寅燮 濟州大學校 亞熱帶農業硏究所 1985 亞熱帶農業硏究 Vol.2 No.-
안개초의 生長點 배양을 利用한 virus 無毒株 生産을 위하여 NAA와 BA의 組合에 따른 生育調査와 幼苗의 發根에 對한 실험을 3種의 培地를 對象으로 活性炭 처리와 NAA 처리를 실시한 바 그 結果는 다음과 같다. 1. 生長點 배양에 가장 적합한 生長調節物質의 組合은 개량 MS培地에 NAA 0.1mg/ℓ에 BA 1.0mg/ℓ 混用 處理區에 설탕 30g/ℓ, 寒天 7g/ℓ, inositol 100mg/ℓ를 첨가하므로서 나타났다. 2. 幼苗의 發根은 MS培地에서 活性炭 2g/ℓ 첨가구에서 가장 좋았다. 3. 幼苗의 줄기 마디를 1cm로 하여 MS培地에 活性炭 2g/ℓ 첨가구에서 배양할 경우 잠아가 모두 出現하여 生長調節物質을 첨가되지 않고도 대량증식을 위한 계대배양 체계를 확립할 수 있었다. This experiment was conducted to study the rapid clonal mass propagation of virus-free stocks on the Gypsophila paniculata 'Bristol Fairy' in vitro with various combinations of varied BA and NAA concentrations in MS medium, and to elucidate the rooting response of internodal explants at three kinds of medium contained with several rooting agent treatments respectively. The results obtained are as follows: 1. The maximum number of multiple shoots from meristem tips were proliferated on modified MS salts, 30g/ℓ sucrose, 7g/ℓ agar, 100mg/ℓ myo-inositol, with 0.1mg/ℓ NAA plus 1.0mg/ℓ BA. 2. In addition of activated charcoal 2g/ℓto MS medium was apparently promote the in vitro rooting and shoot growth of explants proliferated from meristem tips. 3. In vitro rooting of 1cm internodal explants proliferated from meristem tips, namely in vitro micro-cuttings, was formulated a subculturing system for rapid clonal mass propagation of Gypsophila without any plant growth regulators supplimented.
소인섭,송기철,정윤관,김준섭 한국고분자학회 2021 Macromolecular Research Vol.29 No.11
In this study, the effects of the degree of neutralization and cation type on water absorption of poly(styrene-co-methacrylate) ionomers were investigated. It was found that the water absorption of the ionomer increased as the degree of neutralization increased. It was also observed that for the same ion content, fully neutralized ionomers had less water absorption than partially neutralized ionomers. In the case of ionomers neutralized with various cations, water absorption increased when the type of cation was changed from Li+ to Na+, whereas the water absorption decreased when the type of cation was changed from Na+ to Cs+. Ba2+-neutralized ionomers absorbed less water than K+-neutralized ionomers with a cation size similar to Ba2+. Based on the above findings, it was concluded that the water absorption of ionomers could be understood only by simultaneously considering the number and size of multiplets, the plasticization of multiplets, and the contact surface area occupied by the polymer chains emanating from the multiplets.