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STUDIES ON RESPONSES OF THE RICE PLANT TO PHOTOPERIOD
SuBong Ahn,V S Vergara 韓國作物學會 1969 Korean journal of crop science Vol.- No.5
수도재배시기이동시의 품종의 적응성 또는 외국품종도입시 그 적부판단의 기준이 되는 일장 및 온도효과의 본질과 한국품종들의 감응도를 분석비교하였다. 시험결과 공시품종들은 전부 일장에 대하여 비교적 둔감하고 어느 처리일장하에서나 출수하여 한계일장이 없었으나 만생품종은 조생종에 비하여 감광성이 예민하고 기본영양생장기간이 짧었고 조생품종은 기본영양생장성이 컸으며 최적일장은 전품종 10시간전후였다. 또한 온도도 일장과 같이 생육기간에 대하여 영향이 큰 것 같고 저온은 일장의 장단, 품종의 조만에 관계없이 출수를 지연시키고 고온은 기본영양생장기간을 단축시키고 일장감응기에는 별로 영향이 없었다. The photoperiod and temperature response of Korean varieties were studied under field and greenhouse conditions. Results of the experiment indicated that all varieties tested were relatively intensitive to photoperiod. The early varieties were least affected by photoperiod while the late varieties showed the greatest response. Low temperature delays flowering either under short daylength or natural daylength. In general, temperature has a greater effect than photoperiod on the growth duration of the varieties used. The late varties had longer photoperiod-sensitive phase than the early varieties. Temperature has very little effect on the photoperiod-sensitive phase. The basic vegetative phase is longer in the early varieties than the late varieties. High temperature results shorten duration of the basic vegetative phase.
First Record of the Biting Midges, genus Atrichopogon (Diptera: Ceratopogonidae) from Korea
Subong Ha,Mijin Kim,Jeeyoung Park,Youngju Kim,Hungsik Lee 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.10
Recently in the course of examining Korean diptera, we found a species, Atrichopogon femoralis Tokunaga placed in the subfamily Forcipomyinae Meigen. Forcipomyinae is most specious in the family Ceratogonidae, and comprise about 5,566 extant species placed in 103 genera in four subfamilies (Borkent and Wirth, 1997) from almost all the zoogeographic regions. Genus Atrichopogon is second largest genus, with about 520 species (Borkent, 2012). Currently 39 valid species of 6 genera belonging to 3 subfamily are known in Korea. The specimens were collected from intermountain area and reservoir of Chungcheongnam-do, Cheonan-si, and Gyeongsangbuk-do, Gyeongju-si by black light trap (BLT) in 2013. We report an occurrence Atrichopogon femoralis Tokunaga for the first time in Korea, and of which diagnosis, description, distribution and photo images are presented. For further researches, we also provide a key to genera of Korean Ceratopogonidae.
Synthesis of Polyacrylonitrile as Precursor for High-Performance Ultrafine Fibrids
Subong Kim,Yun-Su Kuk,Fan-Long Jin,박수진 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
Polyacrylonitrile (PAN) copolymers with different methyl acrylate (MA) contents were synthesized via solution polymerization and used as precursors for high-performance PAN ultrafine fibrids. The chemical structures of the copolymers were characterized using Fourier-transform infrared spectroscopy and 13C nuclear magnetic resonance spectroscopy. Their particle sizes and aspect ratios increased with increasing viscosity, and the degree of crystallinity increased with decreasing concentration of copolymer solution. In contrast, their peak temperature and heat of exotherm increased with decreasing concentration of the copolymer solution. The aromatization indices (AIs) of the fibrids increased with increasing heat-treatment time; however, the AIs decreased when the heat-treatment temperature was higher than the onset temperature of the copolymers. On the other hand, the crystal sizes of the fibrids decreased with increasing concentration of the copolymer solution when the MA content was held constant.
Preparation and Characterization of PAN-based Superfined Carbon Fibers for Carbon-paper Applications
Subong Kim,Yong Sik Chung,Heung-Soap Choi,Fan-Long Jin,박수진 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
Polyacrylonitrile (PAN)-based ultrafine fibers and carbon fibers were produced by wet-spinning, and the crystal sizes and thermal and mechanical properties of the fibers were investigated. Scanning electron microscopy revealed that the superfine fibrils in the surfaces of the PAN/polyvinyl acetate (PVA) blend fibers increased slightly with increasing PAN content before removal of the PVA. Differential scanning calorimetry indicated that the PAN and PVA in the blend fibers do not mix and, therefore, each maintains their inherent thermal characteristics. The crystal sizes of the blend fibers prepared by removing PVA with water increased at 5 wt % water. The extent of the reaction of the PAN carbon fibers, as calculated from the FT-IR spectra, is maximized at the stepwise temperature of 230 oC, and the density increased significantly above this temperature. The carbon fibers had relatively good mechanical properties, as shown by their tensile strength and modulus values of 2396 MPa and 213 GPa, respectively.