• Current Research on Agriculture and Life Sciences
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• v.22
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• pp.29-39
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• 2004

This study was conducted to provide a fundamental information for commercial, medical usage and mushroom gene preservation and to investigate the diversity of indigenous mushroom on Bonghwa-Gun. A total of 3 classes 2 subclasses 13 orders 45 families 64 genera and 118 species including saprophytic and ectomycorrhizal fungi was investigated. The mushroooms are classified into 17 families 32 genera and 80 species in Agaricales, 13 families 17 genera and 22 species in Aphllophorales, 2 families 2 genera and 2 species in Heterobasidiomycetes, 9 families 9 genera and 10 species in Gasteromycetidae. There were edible mushroom of 46 species at Moonsu and Chungryang Mountain. The mushroom occurrence was closely related to vegetation and soil environmental conditions.

• KSBB Journal
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• v.19 no.5
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• pp.341-347
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• 2004

Several gene delivery therapies are being developed for treatment of serum protein deficiency. EPO is one of the most promising therapeutic agent for this treatment which is currently being investigated in depth. This study has the ultimate purpose of improving the gene delivery system for an increase of red blood cell production. A plasmid DNA was constructed smaller than other plasmids for an increase in penetration into animal cells, and two genes were cloned into each vector as a co-delivery system to express erythropoietin, and interluekin-3 or thrombopoietin, which can act on erythroid cell, thus activating hematopoiesis synergically. This co-delivery system has an advantage of decreasing the labour required for industrial production of DNA vaccine. A new plasmid vector, pVAC, in size 2.9 kb, was constructed with the essential parts from PUC 19 and pSectagB, which is much smaller than other plasmid vector and is the size of 2.9 kb. Co-delivery system was constituted by cloning human erythropoietin with each of human interluekin-3 gene or human thrombopoietin gene into both pVAC and pSectagB. As a result, the transfection efficiency of pVAC was higer than that of pSectagB in vitro, and hematocrit level of the mice injected with pVAC is higher than that of other mice. And co-delivery system, made of several plasmid DNAs, was expressed in vitro.

• Asian-Australasian Journal of Animal Sciences
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• v.25 no.8
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• pp.1055-1062
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• 2012

Two SNPs, i.e. L127V and T172M, of bovine growth hormone (GH) causing the presence of GH gene haplotypes A, B, and C was previously shown to alter intramuscular fatty acid (FA) composition in Japanese Black (JB) heifers. To determine the SNP effect on somatotropic hormone concentration and lipogenesis, we measured plasma GH, insulin, and insulin-like growth factor-1 (IGF-1) concentrations. We also measured mRNA levels of fatty acid synthase (FASN), stearoyl-coA desaturase (SCD), and sterol regulatory element binding proteins-1 (SREBP-1) and FA composition in diaphragm tissues. Heifers with genotype CC had the lowest plasma insulin concentration and FASN and SCD mRNA levels among genotypes. FASN mRNA levels in haplotype A tended to positively correlate with saturated FA (SFA) content and negatively correlated with C18:2 and unsaturated FA (USFA) contents. SCD mRNA levels in haplotype A positively correlated with monounsaturated FA (MUFA) contents and negatively correlated with C18:0 content. They also tended to positively correlate with C16:1, C18:1, and USFA contents and USFA/SFA ratio and negatively correlate with SFA content. Taken together, GH gene polymorphism affects the lipogenic genes expression levels and their relationships with fatty acid compositions in diaphragm tissues of JB heifers at 31 months of age.

• Journal of Microbiology and Biotechnology
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• v.18 no.5
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• pp.837-844
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• 2008

Glucose (xylose) isomerases from Streptomyces sp. have been used for the production of high fructose corn syrup for industrial purposes. An 11-kb DNA fragment containing the xyl gene cluster was isolated from Streptomyces lividans TK24 and its nucleotide sequences were analyzed. It was found that the xyl gene cluster contained a putative transcriptional repressor (xylR), xylulokinase (xylB), and xylose isomerase (xylA) genes. The transcriptional directions of the xylB and xylA genes were divergent, which is consistent to those found in other streptomycetes. A gene encoding XylR was located downstream of the xylB gene in the same direction, and its mutant strain produced xylose isomerase regardless of xylose in the media. The enzyme expression level in the mutant was 4.6 times higher than that in the parent strain under xylose-induced condition. Even in the absence of xylose, the mutant strain produce over 60% of enzyme compared with the xylose-induced condition. Gel mobility shift assay showed that XylR was able to bind to the putative xyl promoter, and its binding was inhibited by the addition of xylose in vitro. This result suggested that XylR acts as a repressor in the S. lividans xylose operon.

• BMB Reports
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• v.32 no.2
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• pp.189-195
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• 1999

From the Panax ginseng chloroplast, the psbE and psbF genes, encoding the $\alpha$- and $\beta$-subunits of cytochrome b-559 of the photosystem II reaction center, respectively, were cloned and characterized. The psbE and psbF genes were composed of 252 and 117 nucleotides, respectively. The deduced amino acid sequence of the $\alpha$-subunits showed 95%, 93%, and 91% homology to monocots, dicots, and liverwort, respectively, whereas the $\beta$-subunits showed approximately 98% to 95% homology to the same species. Southern blot analysis revealed that a single copy of the psbEF gene exists in the chloroplast plastid. Northern blot analysis indicated that the psbE and psbF genes are cotranscribed as a polycistron.

• Proceedings of the Zoological Society Korea Conference
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• 1996.10a
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• pp.195.2-195
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• 1996

acs gene cloning was constructed by subcloning the 2.2-kb MunI-MunI restriction fragment of 638 and 639 which include acs gene from the kohara phage into the unique EcoRI site of pUC18 and pJM9131 containing the PHA biosynthesis genes. Then recombinant E. coli fadRatoC(Con) mutants containing the polyhydroxyalkanoate(PHA) biosynthesis genes are able to incoporate s significant levels of 3-hydroxyvalerate (3HV) into the copolymer [P(3HB-co-3HV)]. Quantitative determination of PHB and P(3HB-co-3HV) was performed by gas-chromatographic analysis of extracts obtained from methanolysis of lyophilized cells.

• Journal of Plant Biology
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• v.37 no.1
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• pp.27-36
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• 1994

For establishing a transformation system of rice, an efficient introduction of foreign genes into embryogenic cell suspension by particle bombardment was conducted. The particle inflow gun based on the acceleration of DNA-coated tungsten particles using pressurized helium was constructed for delivery of DNA into rice cells. Several bombardment parameters were optimized using the transient expression of GUS gene. The conditions that gave the highest GUS gene expression of about 1000 blue spots per g fresh weight of bombarded cells include treatment of the cells with 0.5 M osmotic pressure, and use of the 410 kPa helium, 110 mm target distance, 13 mm syringe filter holder and 5 $\mu$L DNA/tungsten mixtures. It was also confirmed that rice actin promoter-intron construct gave the highest expression of all promoter-sequences studied. Eight weeks after the bombardment, stably transformed calluses were obtained on the selection medium containing 100 mg/L G418 and showed the strong activity in in situ GUS assay.

• Korean Journal of Agricultural Science
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• v.41 no.3
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• pp.245-249
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• 2014

Among dozens of DNA polymerases cloned from thermophilic bacteria, Taq DNA polymerase from Thermus aquaticus has been most frequently used in polymerase chain reaction (PCR) that is being applied to gene cloning, DNA sequencing, gene expression analysis, and detection of infectious and genetic diseases. Since native Taq DNA polymerase is expressed at low level in T. aquaticus, recombinant Escherichia coli system was used to produce Taq DNA polymerase in a large amount. Taq DNA polymerase was expressed as a soluble form under the control of tac promoter in E. coli, and purified by heat treatment and ion exchange chromatographies. The purified Taq DNA polymerase was nearly homogeneous and exhibited a similar DNA amplification activity with a commercial Taq DNA polymerase.

• Journal of Species Research
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• v.13 no.1
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• pp.61-66
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• 2024

During an investigation of unrecorded prokaryotic species in Korea, six unrecorded bacterial strains were isolated from soil samples collected from Uljin-gun. Based on a similarity search using the 16S rRNA gene sequence of the isolated strains and the construction of the neighbor-joining phylogenetic tree, five strains were identified to the genus Pseudomonas of the family Pseudomonadaceae, while one strain was identified as a species belonging to the genus Paenibacillus of the family Paenibacillaceae. The details of these unreported species, including gram staining reaction, colony and cell morphology, basic biochemical characteristics, strain ID, and isolation source, are described in the description of the strains.

• Proceedings of the Microbiological Society of Korea Conference
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• 2002.10a
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• pp.151-158
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• 2002