• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.438-439
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• 2000

지금까지의 연구에서 한국산 넙치 치어에서 분리된 버나바이러스는 MABV (Marine Birnavirus)와 혈청학적으로 유사하며, VP2/NS 경계영역의 염기배열도 MABV와 높은 homology를 가지고 있음을 밝혔다. 본 연구에서는 genome segment A를 중심으로 한국의 넙치에서 분리된 버나바이러스의 유전자해석을 행했다. (중략)

• Korean Journal of Environmental Biology
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• v.21 no.1
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• pp.45-51
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• 2003

Genetic diversity of local populations among geologically isolated groups of Rana amurensis was refined by sequence comparison of the mitochondrial (mt) 165 rDNA genes. Each 401 base pairs of DNA sequences, which was determined from four local populations of Rana amurensis, two local populations of R. nigromacutata, and three species of the genus Rana were used in this analysis. Despite morphological similarity of Rana amurensis, Korean populations were well distinguished from the other groups on the basis of 105 rDNA gene difference. Further analyses for additional local populations belonging to R. amurensis will be necessary to clarify the taxonomic status.

• Polymer(Korea)
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• v.27 no.5
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• pp.464-469
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• 2003

In this work, the fragrant oil release behavior of poly($\varepsilon$-caprolactone) (PCL) microcapsules containing SiO$_2$ was investigated. The SiO$_2$ was chemically treated in 10, 20, and 30 wt% hydrochloric acid and sodium hydroxide. The acid and base values were determined by Boehm's titration technique and $N_2$/77 K adsorption isotherm characteristics, the specific surface area and total pore volume were studied by BET. The PCL microcapsules containing SiO$_2$ and fragrant oil were prepared by oil-in-water (o/w) emulsion solvent evaporation method. The shape and surface of PCL microcapsules were observed using image analyzer and scanning electron microscope (SEM). The fragrant oil release behavior of PCL microcapsules was characterized using UV/vis. spectra. The average diameters of PCL microcapsules were decreased from 35 to 21 $\mu$m with increasing stirring rate. It was found that in the case of acidic treatment the fragrant oil adsorption capacity and release rate were increased due to the increase of specific surface area and acid value. In the case of basic treatment, the fragrant oil adsorption capacity and release rate were decreased due to the decrease of sp ecific surface area and the increase of acid-base interactions between SiO$_2$-NaOH and fragrant oil with increasing base value of SiO$_2$.

• Korean Chemical Engineering Research
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• v.43 no.3
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• pp.401-406
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• 2005

In this work, the effect of chemical treatment of multiwalled carbon nanotubes (MWNTs) on glass transition temperature (Tg), thermal stability, and dynamic viscoelastic behaviors of MWNTs-reinforced epoxy matrix composites has been studied by differencial scanning calorimeter (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) measurements. The MWNTs were chemically treated with 35 wt％ $H_3PO_4$ (A-MWNTs) or 35 wt％ KOH (B-MWNTs) solutions and the changes of surface properties of chemically treated MWNTs were examined by pH, acid and base values, Fourier transfer-infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS) analyses. The chemical treatments based on acid and base reactions led to a significant change of surface characteristics and chemical compositions of the MWNTs, especially A-MWNTs/epoxy composites had higher thermal stability and dynamic viscoelastic properties than those of B-MWNTs and non-treated MWNTs/epoxy composites. These results were probably due to the improvement of interfacial bonding strength, resulting from the acid-base interaction and hydrogen bonding between the epoxy resins and the MWNT fillers.

• Journal of Life Science
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• v.15 no.5 s.72
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• pp.734-738
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• 2005

A gene coding for xylanase from alkali-tolerant Bacillus alcalophilus AX2000 was cloned into Escherichia coli $DH5\alpha$ using pUC19. Among 2,000 transformants, one transformant showed clear zone on the detection agar plate containing oat-spells xylan. Its recombinant plasmid, named pXTY99, was found to carry 7.0 kb insert DNA fragment. When the nucleotide sequence of the cloned xylanase gene (xynT) was determined, xynT gene was found to consist of 1,020 base-pair open reading frame coding for a poly-peptide of 340 amino acids with a deduced molecular weight of 40 kDa. The coding sequence was preceded by a putative ribosome binding site, and the transcription initiation signals. The deduced amino acid sequence of xylanase is similar to those of the xylanases from Bacillus sp. Nl37 and B. stearothermophilus 21 with $61\%$ and $59\%$ identical residues, respectively.

• Journal of the Korean earth science society
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• v.27 no.5
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• pp.528-538
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• 2006

Main aspect of this study is to clarify the petrochemistry and petrogenesis of intermediated-basic plutons located in the southwestern part of the Korean peninsula. These Intermediated-basic plutons consist of Pre-Cambrian anorthosite-gabbro, Triassic hornblende gabbro (Jirisan area), Jurassic diorite-syente (Jirisan and north area) and Cretaceous gabbro-diorite (south area). The Massif type anorthosite has multi intrusions, where each one intruded by gabbroic rocks, composed of gabbro, norite, troctolite and leucogabbro. In the variation diagram of the major-minor composition, AMF and Pl-Px-Ol diagrams, we suggest that intermediated-basic plutons in the southwestern part of the Korea show a trend consistent to Daly's value and calc-alkaline rock series. Accoding to REE (La/Yb)cw and Eu/Sm, these plutons are enriched with LREE than HREE, and emplaced by the tectonic setting in continent and/or continental margin.

• Animal Systematics, Evolution and Diversity
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• v.18 no.1
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• pp.75-84
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• 2002

MtDNA cyt b gene was used to investigate the geographic variation of 11 populations (106 individuals) of the planktonic developing, periwinkle Littorina brevicula, throughout Eastern, Western, and Southern coastal regions in Korea. The sequence of 500 base pairs and 13 different haplotypes were determined. Haplotype LbA was predominated through the populations studied with frequence of 0.877. Haplotypes were shown different frequencies in each coastal region (0.82, 0.90, and 1.00, respectively). enetic analysis of the 61 individuals of L. brevicula from the polluted and unpolluted sites yielded 8 distinct haplotypes. Haplotype LbA also was most common, and it was shared by 0.872 of frequency among specimens.

• Korean Journal Plant Pathology
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• v.12 no.2
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• pp.182-186
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• 1996

국내에서 재배되고 있는 고추(Capsicum annuum L.)로부터 분리된 TMV pepper 계통을 density gradient centrifugation을 이용하여 순화하였다. 이로부터 바이러스의 total RNA를 분리하였고 RT-PCR에 의하여 TMV pepper 계통의 외피단백질 cDNA를 합성, 증폭하였으며 이를 pBluescript II SK- 벡터에 재조합하였다. 본 실험에서 바이러스 외피단백질과 3` non-coding region을 포함하는 재조합 클론 p1561과 p1562로부터 염기서열을 분석하였고 그 결과로 477 염기의 외피단백질 유전자를 포함하는 691 염기가 합성되었음을 확인하였으며 이것과 TMV common 계통으로부터 합성된 외피단백질 cDNA와의 최대 유사도는 69%였다. 또한 유추된 아미노산 서열에서 이들 두 계통간의 최대 유사도는 81%였다.

• Journal of Sericultural and Entomological Science
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• v.51 no.2
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• pp.137-141
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• 2013

In this study, nucleotide sequence structures of intergenic transcribed spacer (ITS) 1, complete 5.8S ribosomal RNA gene and ITS 2 region were analyzed to identify three Peruvian entomopathogenic fungal isolates. The isolates had highly conserved sequence region in 5.8S rRNA gene and unique sequences in ITS 1 and 2 region among them. 5.8S rRNA gene regions were highly conserved and showed high homoloies among tested isolates. In contrast, ITS region showed species-specific sequence region, resulting in inter-genus differencies. Scanning electron microscopic images of these isolates supported the result of ITS-based identification. From these result, Peruvian entomopathogenic fungal isolate J270, J278, were identified as Beauveria bassiana and J271 was identified as Lecanicillium attenuatum.

• Journal of fish pathology
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• v.8 no.1
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• pp.37-46
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• 1995

The amino acid analysis of polyhedrin protein and nucleotide sequence of polyhedrin gene in H. cunea nuclear polyhedrosis virus (HcNPV) genome have been studied. Polyhedrin had three polypeptide bands in SDS - polyactylamide gel electrophoresis. The major polypeptide had a molecular weight of 25 kd. The polyhedrin was composed of 17 different amino acids. HcNPV DNA was digested with EcoRI restriction enzyme and hybridized with ($\alpha^{32}P$) -labelled AcNPV polyhedrin gene cDNA. The polyhedrin gene was located on the fragment of EcoRI-H. The EcoRI - H fragment containing polyhedrin gene was cloned into the EcoRI site of pUC8 vector which was confirmed with southern blotting, and the recombinant plasmid containg polyhedrin gene was designated as hPE-H. The promoter region of polyhedrin genomic DNA was sequenced. The sequences identified as the TATA box was found at the 5' flanking region of the polyhedrin genomic DNA approximately -79 bp upstream from the transcriptional start site. But CAAT-like box was not shown near the TATA-like box in the polyhedrin gene. Four tandem repeats with the sequence 5' -CTAATAT-3' and 5'-TAAATAA-3' were found between -141 and -108 or -83 upstream and -52 bp downstream from the translation start site. About -141 bp region upstream from the translational start site was highly AT (78%) rich. The coding region for the polyhedrin starts and ends with ATG and TAA, respectively.