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이동진,신동일,채제천,윤성탁,류수노,김성민,정길웅 한국국제농업개발학회 2000 韓國國際農業開發學會誌 Vol.12 No.3
보리 품종의 수발아성 차이와 벼 왕겨를 이용하여 발아억제 효과를 구명, 수발아 방지를 위한 기초자료를 얻고자 실시한 결과는 다음과 같다. 1. 공시품종들의 수발아성은 7.0∼42.3% 범위를 나타냈으며, 겉보리인 탑골보리, 찰보리 새올 보리와 쌀보리인 새찰쌀보리가 수발아에 강한 품종이었다. 2. 벼왕겨의 메탄올 추출물이 에칠아세테이트와 에칠에테르보다 발아억제 효과가 크게 나타났다. 3. IR30 및 철원 52호의 왕겨에서 메탄올로 추출한 용액이 IR36 및 IR60보다 발아율, 초장, 근장의 억제 효과가 크게 나타났다. 4. IR30 왕겨로부터 추출된 발아억제물질은 보리 품종들의 발아 및 유모생장을 억제시켰다. This experiment was conducted to determine a varietal differences of viviparity and to elucidate the effect of germination inhibition by extractive substances of rice hull in barley cultivars. Seven barley cultivars, four rice hulls, and three extract solvents were used in this study, respectively. The percentage of viviparity in barley cultivars was ranged from 7.0% to 42.3%. Among the tested cultivars. Tapgolbori, Chalssalbori, Saeolbori, and Saechalssalbori were shown higher in viviparous germination with sand bed method for screening. Methanol extract of rice hull of rice cultivar, IR30 was inhibited significantly germination of barley seeds compared to that of ethyl acetate and ethyl ether. Extractive methanol substance of rice hull of IR30 and Cheolwon 52 cultivars were decreased in germination ratio, plant height, and root length compared to IR36 and IR60. Extraction substances from rice hull of IR30 were significantly decreased in germination and seedling growth of several barley cultivars.
Identification and Characterization of Small RNAs from Vernalized Arabidopsis thaliana
( Mi Jin Oh ),( Ho Rim Lee ),( Young Kook Kim ),( Jin Wu Nam ),( Je Keun Rhee ),( Byoung Tak Zhang ),( V Narry Kim ),( Il Ha Lee ) 한국식물학회 2007 Journal of Plant Biology Vol.50 No.5
MicroRNAs (miRNAs) and small interfering RNAs (siRNAs) are two major classes of small non-coding RNAs with important roles in the regulation of gene expression, such as mRNA degradation and translational repression, heterochromatin formation, genome defense against transposons and viruses in eukaryotes. MiRNA- and siRNA-directed processes have emerged as a regulatory mechanism for growth and development in both animals and plants. To identify small RNAs that might be involved in vernalization, a process accelerating flowering brought on by a long period of cold, we generated a library of small RNAs from Arabidopsis that had been subject to vernalization. From the analysis of the library, 277 small RNAs were identified. They were distributed throughout all the five chromosomes. While the vast majority of small RNA genes locate on intergenic regions, others locate on repeat-rich regions, centromeric regions, transposon-related genes, and protein-coding genes. Five of them were mapped to convergent overlapping gene pairs. Two-hundred and forty of them were novel endogenous small RNAs that have not been cloned yet from plants grown under normal conditions and other environmental stresses. Seven putative miRNAs were up- or down-regulated by vernalization. In conclusion, many small RNAs were identified from vernalized Arabidopsis and some of these identified small RNAs may play roles in plant responses to vernalization.
( Chul Hong Oh ),( Mahanama De Zoysa ),( Do Hyung Kang ),( Young Deuk Lee ),( Il Son Whang ),( Chamilani Nikapitiya ),( Soo Jin Heo ),( Kon Tak Yoon ),( Abu Affan ),( Je Hee Lee ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.10
A Bacillus subtilis strain was isolated from the intestine of Sebastiscus marmoratus (scorpion fish) that was identified as Bacillus subtilis CH2 by morphological, biochemical, and genetic analyses. The chitosanase of Bacillus subtilis CH2 was best induced by fructose and not induced with chitosan, unlike other chitosanases. The strain was incubated in LB broth, and the chitosanase secreted into the medium was concentrated with ammonium sulfate precipitation and purified by gel permeation chromatography. The molecular mass of the purified chitosanase was detected as 29 kDa. The optimum pH and temperature of the purified chitosanase were 5.5 and 60℃, respectively. The purified chitosanase was continuously thermostable at 40℃. The specific acitivity of the purified chitosanase was 161 units/mg. The N-terminal amino acid sequence was analyzed for future study.
Kim, Sam Woong,Jeong, In Sil,Jeong, Eun Ju,Tak, Je Il,Lee, John Hwa,Eo, Seong Kug,Kang, Ho Young,Bahk, Jeong Dong Korean Society for Molecular Biology 2008 Molecules and cells Vol.26 No.1
The plasmid pJB01, a member of the pMV158 family isolated from Enterococcus faecium JC1, contains three open reading frames, copA, repB, and repC. Plasmids included in this family produce counter-transcribed RNA (ctRNA) that contributes to copy number control. The pJB01 ctRNA, a transcript which consists of 54 nucleotides (nts), is encoded on the opposite strand from the copA/repB intergenic region and partially overlaps an atypical ribosome binding site (ARBS) for repB. The ARBS is integrated by the two underlined conserved regions: 5'-TTTTTGTNNNNTAANNNNN NNNNATG-3', and the ctRNA is complementary only to the 5' conserved sequence 5'-TTTTTGT-3'. This complementary sequence is located at a distance from the terminal loop of the ctRNA secondary structure. The ctRNA structure predicted by the mfold program suggests the possible generation of a terminal and an internal hairpin loop. The amount of in vitro translation product of repB mRNA was inversely proportional to the ctRNA concentration. Mutations in the terminal and internal hairpin loops of the ctRNA had inhibitory effects on its binding to the target mRNA. We propose that the intact structures of the terminal and internal hairpin loops, respectively, play important roles in forming the initial kissing and extending complexes between the ctRNA and target mRNA and that these regulate the copy number of this plasmid.
( Jin-ho Sung ),( Ha-na Jang ),( Seung-ki Back ),( Bup-mook Jeong ),( Yong-chil Seo ),( Jeong-hun Kim ),( Yun-tak Cho ),( Jong-il Kim ),( Hyun-je Sung ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Fossil fuel combustion generates large amount of green house gas, which was mainly considered as a major contributing emission source of global warming. In order to reduce green house gas, renewable energy has been emerged as an alternative energy. Waste and biomass are considered major resource as one of renewable energy, but it has been not utilized sufficiently. In this paper, waste sludge and wood chip fuel were utilized as main fuels in order to develop technology of waste to energy using oxy-fuel combustion in circulating fluidized bed. In oxy-fuel combustion, oxygen injection rate and superficial velocity were determined as 23% and 2.27m/s for fast fluidization, respectively. Fuel feeding rate was calculated as 13kg/hr. For producing high purity carbon dioxide, flue gas recirculation system was operated with oxy-fuel combustion. During flue-gas recirculation, temperature gradient was more homogeneous, and the stable combustion was maintained. Finally, the carbon dioxide in flue-gas was enriched above 90% to apply carbon capture and storage technology.
Combustion of Waste Sludge by Oxygen with Carbon Dioxide at a Circulating Fluidized Bed
( Ha-na Jang ),( Jeong-hun Kim ),( Jin-ho Sung ),( Seung-ki Back ),( Yun-tak Cho ),( Jong-il Kim ),( Hyun-je Sung ),( Yong-chil Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Pilot bed tests using circulating fluidized bed reactor (CFB) were conducted to apply oxy-fuel technology for sludge combustion as a carbon capture and storage (CCS) technology. In preliminary, the hydrodynamics of circulating fluidized bed reactor was observed in the cold-bed setup to simulate the 30KWth CFB oxy-fuel pilot test bed, in which the superficial velocity for fast fluidization was determined over than 2.5m/s. The minimum fluidization velocity (U<sub>mf</sub>) was estimated as 0.104 m/s. In the pilot test, air and oxy-fuel thermal oxidation experiments for sludge were conducted with a flue-gas recirculation unit. In the pilot test, the temperature profile was uniformly depicted and the pressure gradient was depicted as a typical CFB trend at each point. The flue-gas temperature was relatively higher in the range from 21 to 25% which indicate that the heat transfer rate was relatively higher with this range. The carbon dioxide from waste sludge combustion was gradually increased when oxygen injection rate was decreased and was approached over than 80% with oxygen injection rate ranged from 21 to 25%.