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이상규,Kwan-Dal Ko,Chiwon W. Lee 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.5
The patterns of C14 carbohydrate translocation and distribution from the source leaf to various plant parts in watermelon grown in the greenhouse and field were investigated. Seedling-grown plants were pruned to two branches with one carrying a fruit. When leaves at four different positions (on fruit-bearing node, on the 5th node above and below the fruit-bearing node, and on the 5th node from the base of the non-fruit-bearing stem) were exposed to 14CO2, the distribution of C14 compounds to different parts (fruit, stem, leaf, and root) of the plant varied. In all treatments, the fruit was the strongest sink, followed by the stem, leaf, and root. The highest percentage of C14 photoassimilates was translocated out of the source when the leaf born on the fruit-bearing node was exposed to 14CO2 in both greenhouse- and field-grown plants. Translocation of C14 compounds from the leaves on the 5th node or above and below the first fruit-carrying node was similar. Only 29% of C14 was translocated from the source leaf born on the 5th node of the non-fruit bearing branch in the greenhouse, as compared to more than 46% of the C14 from other source leaves. Accumulation of C14 in the root tissues was greatest when source leaves were born on the non-fruit bearing branch. In general, field-grown plants had a larger proportion of the C14 translocated as compared to greenhouse-grown plants.
NBR 계 고무롤의 물성개질에 관한 연구(1) : NBR/PVC Blend Systems NBR/PVC 혼합계 고무
서관호,고영철,하현달,조을용 한국고무학회 1995 엘라스토머 및 콤포지트 Vol.30 No.3
To modify the NBR rubber roll which has poor abrasion and chemical resistance, NBR/PVC blends were prepared in various composition ratios. First of all, their miscibility and vulcanization characteristics were investigated. Their abrasion and chemical resistant properties and physical properties were also studied. DSC thermograms for NBR/PVC blends show only one Tg in the entire composition range, demonstrating a perfect miscibility. In the vulcanization characteristics tested by rheometer, maximum torque decreases as PVC contents increased. In the investigation of physical properties of NBR/PVC blends, hardness increases and elongation decreases along with the increasing contents of PVC. On the other hands, tensile strength increases with the increasing contents of PVC up to 11.1 wt. %, and then decreases with higher contents of PVC. While the abrasion resistance of NBR/PVC blends was similar to that of NBR itself, the chemical resistance of NBR/PVC blends was superior to that of NBR.