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( Hong Sik Choi ),( Ki Taek Lim ),( Jang Ho Kim ),( Joo Young Park ),( Soung Hoo Jeon ),( Han Wool Choung ),( Chong Su Cho ),( Yun Hoon Choung ),( Pill Hoon Choung ),( Jong Hoon Chung ) 한국조직공학·재생의학회 2010 조직공학과 재생의학 Vol.7 No.5
In this study two types of scaffolds which have taken the merits of polymer and bioceramics were prepared, and in vitro and in vivo effects of the novel degradable polymer-bioceramic scaffolds seeded with human dental pulp stem cells (hDPSCs) were investigated. Three elements were considered for the scaffolds; poly-DL-lactide (PDLLA), as degradable polymer, and tooth apatite (TA) and β-tricalciumphosphate (TCP) as degradable bioceramics. The first scaffold consists of PDLLA exclusively, the second of PDLLA and TA (1:1) and the third of PDLLA, TA and TCP (1:1:1). The scaffolds were compared with each other in vitro and in vivo using hDPSCs as their cell source. hDPSCs were isolated from extracted third molars, cultured, attached, proliferated and differentiated prior to the in vitro and in vivo experiments. Scanning electron microscope observation was carried out to reveal the attachment and growth of hDPSCs on the surfaces of three scaffolds, and the quantitative assay of cell proliferation was also detected. It was shown that hDPSCs attached and spread further in the polymer-bioceramic groups (PDLLA/TA/TCP and PDLLA/TA) compared to the polymer group (PDLLA), and there was also less inflammatory reaction in the polymer-bioceramic scaffolds, transplanted subcutaneously in the dorsal area of immunocompromised mice. In addition, the polymer-bioceramic groups (PDLLA/TA/TCP, PDLLA/TA) showed intensive cementum- like mineralization in vivo. Thus, it could be concluded that the polymer-bioceramic groups might serve as novel potential scaffolds for tooth bioengineering.
A New Early Maturity Rice Cultivar, "Unkwang" with High Grain Quality and Cold Tolerance
Ki Young Kim,Ki Yong Ha,Jong Cheol Ko,Jin Il Choung,Jae Kil Lee,Jae Kwon Ko,Bo Kyeong Kim,Jeong Kwon Nam,Mun Sik Shin,Yoon Hee Choi,Young Doo Kim,Myung Kyu Oh,Yeon Kyu KimChu 한국육종학회 2006 한국육종학회지 Vol.38 No.4
Unkwang is a newjaponica rice cultivar developed from the cross between Sobibyeo (Iksan435), high yield and coldtolerance cultivar and Cheolweon 54, early maturity cultivar at Honam Agricultural Reaserch Institute (HARI), NICS, RDA, m2004. This cultivar h
Ki-Won Oh,Myoung-Gyun Choung,Suk-Bok Pae,Chan-Sik Jung,Byung-Joo Kim,Yil-Chan Kwon,Jung-Tae Kim,Yong-Ho Kwack 韓國作物學會 2000 Korean journal of crop science Vol.45 No.5
Near-infrared reflectance spectroscopy (NIRS) was used to estimate the lipid and protein contents in ground seed samples of perilla (Perilla frutescens Brit.) and peanut (Arachis hypogaea L.). A total of 46 perilla and 80 peanut calibration samples and 23 perilla and 46 pea. nut NIRS validation samples were used for NIRS equation development and validation, respectively. Validation of these NIRS equations showed a range of very low bias (-0.05 to 0.13 %) and standard error of prediction corrected for bias (0.224 to 0.803%) and very high coefficient of determination (R2 ) (0.962 to 0.985). It was concluded that NIRS could be adapted as a mass screening method for lipid and protein contents in perilla and peanut seed.
A New Aromatic and High-Yielding Japonica Rice Cultivar "Mihyangbyeo"
Ki Yong Ha,Young Doo Kim,Jae Kil Lee,Hyun Tak Shin,Tae Hwan Noh,Jin Il Choung,Mun Sik Shin,Jae Kwon Ko,Bo Kyeong Kim,Young Tae Lee,Seung Yeob Lee,Hyun Soon Kim,Hyun Jung Kang 한국육종학회 2003 한국육종학회지 Vol.35 No.4
Mihyangbyeo, a new japonica aromatic rice (Oryza sativa L.) was developed by National Honam Agricultural Experiment Station (NHAES), RDA in 1998. It was derived from the three-way cross among Seomjinbyeo of the disease resistance and high yielding lines
Ki-Young Kim,Bo-Kyeong Kim,Mun-Sik Shin,Jin-Il Choung,Jae-K weon Ko,Jung-Kon Kim,Jung-Hyun Lim,Song-Joong Yun 韓國作物學會 2004 Korean journal of crop science Vol.49 No.4
This study was carried out to investigate the antioxidative enzymes and isozymes between chilling-tolerant and -susceptible varieties at the booting stage under cold water stress (13~circC) in japonica rice. Total SOD, CAT, POX, and GR activities on the basis of protein were found to be important factors to defend cold water stress. Especially, SOD and CAT activities showed distinctive differences between chilling-tolerant and -susceptible varieties. Chilling-tolerant varieties were higher than chilling-susceptible varieties for SOD and CAT activities. One of eight isozyme bands for SOD was a inducible isoform. Three isozymes for CAT and one isozyme for POX were closely correlated with defense to cold water stress. Total GR activities except Stejaree 45 on the basis fresh weight and POX were increased by cold water stress, but there was no difference between chilling-tolerant and -sus-ceptible varieties.
Kim Ki-Young,Kim Bo-Kyeong,Shin Mun-Sik,Choung Jin-Il,Ko Jae-Kweon,Kim Jung-Kon,Lim Jung-Hyun,Yun Song-Joon The Korean Society of Crop Science 2004 Korean journal of crop science Vol.49 No.4
This study was carried out to investigate the antioxidative enzymes and isozymes between chilling-tolerant and -susceptible varieties at the booting stage under cold water stress $(13^{\circ}C)$ in japonica rice. Total SOD, CAT, POX, and GR activities on the basis of protein were found to be important factors to defend cold water stress. Especially, SOD and CAT activities showed distinctive differences between chilling-tolerant and -susceptible varieties. Chilling-tolerant varieties were higher than chilling-susceptible varieties for SOD and CAT activities. One of eight isozyme bands for SOD was a inducible isoform. Three isozymes for CAT and one isozyme for POX were closely correlated with defense to cold water stress. Total GR activities except Stejaree 45 on the basis fresh weight and POX were increased by cold water stress, but there was no difference between chilling-tolerant and -susceptible varieties.