• Proceedings of the Korean Society of Plant Pathology Conference
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• 2000.10a
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• pp.41.2-41
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• 2000

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2000.10a
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• pp.44.1-44
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• 2000

• Bulletin of the Korean Chemical Society
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• v.33 no.11
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• pp.3857-3860
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• 2012

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.380.2-380.2
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• 2016

The emergence of new infectious diseases, the resurgence of several infections that appeared to have been controlled and the increase in bacterial resistance have created the necessity for studies directed towards the development of new antimicrobials. In the present study, we have synthesized a novel antioxidant ZnO nanoparticle that is newly designed and prepared by simple surface modification process. Antioxidative functionality is provided by the immobilization of antioxidant 3-(3,4-dihydroxyphenyl)-2-propenoic acid (caffeic acid, CA) onto the surface of ZnO nanoparticles. Microstructure and physical properties of the ZnO@CA nanoparticles were investigated by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR) and steady state spectroscopic methods. Antimicrobial Activities of ZnO@CA nanoparticles were measured against various bacterial strains using antibacterial testing methods.

• Journal of Microbiology
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• v.38 no.3
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• pp.156-159
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• 2000

The cttl+ gene in Schizosaccharomyces pombe encoeds a catalse responsible for H2O2-resistance of this organism as judged by the H2O2-sensitive phenotype of the ctt1Δ mutant. In this study, we investigated the subcellular localization of the Ctt1 gene product. In wild type cells catalase activity was detected in the organelle fraction as well as in the cytosol. The ctt1Δ mutant contained no catalase activity, indicating that both cytosolic and organellar catalases are the products of a single ctt1+ gene. Western bolt analysis revealed two catalase bands, both of which disappeared in the ctt1Δ mutant. The major, fastermigrating band existed in the cytosol whereas the monor, slower-migrating band appeared to be located in organelles, most likely in peroxisomes. These results suggest that the ctt1+ gene product targeted to the peroxisome is a modified form of the one in the cytosol.

• The Korean Journal of Nuclear Medicine
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• v.36 no.4
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• pp.209-223
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• 2002

By considering the biological properties of a tumor, it should be possible to realize better results in cancer therapy. PET imaging offers the opportunity to measure tumor growth non-invasively and repeatedly as an early assessment of response to cancer therapy. Measuring cellular growth instead of energy metabolism showed offer significant advantages in evaluating therapy. Thymidine and its derivative nucleoside compounds can be changed to mono, di- and tri- phosphate compounds by thymidine kinase and then be incorporated into DNA. Their bindings are increased in highly proliferating cells due to the high DNA synthesis rate. To evaluate cell proliferation, many kinds of thymidine and uridine derivatives have been labeled with positron emitter and radioactive iodine. Compared to radiopharmaceuticals which have radioisotope labeled base ring such as pyirmidine, the radiopharmacuticals which have radioisotope labeled sugar ring are more stable in vivo and have metabolic resistance. The biological properties such as DNA incorporation ratios are highly dependent on their chemical structures and metabolic processes. This overview describes synthesis of radiopharmaceuticals and their biological properties for imaging of tumor cell proliferation.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.6
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• pp.145-152
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• 2014

This Study was done to estimate the availability of biological resistance analysis method in medical equipment companies in Korea, and if it is usefull in predicting risk of obesity and cardiovascular disease and managing of it, by means of comparing it with blood tests. Especially, we analyzed the correlation between circumference length and fat thickness of each site of body area, which are ones of among measurement values of the BIA. This study has the purpose to propose the use of BIA as basement of diagnosis for efficient management and assessment in the medical device industry in our country.

• Korean Journal of Environmental Agriculture
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• v.23 no.3
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• pp.123-127
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• 2004

In many organisms, trehalose has been Down as an energy source and a protectant against various environmental stresses such as desiccation, freezing, heat and osmotic pressure. Previously, we have isolated and characterized the genes encoding trehalose-6-phosphate synthase (ZrTPS1) and trehalose-6-phosphate phosphatase (ZrTPS2) from one of the most osmotolerant yeasts, Zygosaccharomyces rouxii. We have also generated transgenic plants by co-introduction of ZrTPS2 and ZrTPS2 into potato plant (ZrTPS2-2A-ZrTPS1 plant) in an attempt to metabolically engineer trehalose in the transgenic plant using the foot-and-mouth disease virus(FMDV) 2A system and to generate drought resistant crop plants. In this research, we assayed previously generated the ZrTPS2-2A-ZrTPS1 plant biofunctionally by drought treatment, and measured the amount of trehalose in the ZrTPS2-2A-ZrTPS1 transgenic plants. The ZrTPS2-2A-ZrTPS1 transgenic plant showed strong drought resistance in spite of little or no accumulation of transgenic in he transgenic plant compared with control plant.

• The Plant Pathology Journal
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• v.24 no.3
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• pp.245-268
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• 2008

The outcome of plant-pathogen interactions is influenced significantly by endogenous small molecules that coordinate plant defence responses. There is currently tremendous scientific and commercial interest in identifying chemicals whose exogenous application activates plant defences and affords protection from pathogen infection. In this review, we provide a survey of compounds known to induce disease resistance in plants, with particular emphasis on how each compound was originally identified, its putative or demonstrated mechanism of defence induction, and the known biological target(s) of each chemical. Larger polymeric structures and peptides/proteins are also discussed in this context. The quest for novel defence-inducing molecules would be aided by the capability for high-throughput analysis of candidate compounds, and we describe some issues associated with the development of these types of screens. Subsequent characterization of hits can be a formidable challenge, especially in terms of identifying chemical targets in plant cells. A variety of powerful molecular tools are available for this characterization, not only to provide insight into methods of plant defence activation, but also to probe fundamental biological processes. Furthermore, these investigations can reveal molecules with significant commercial potential as crop protectants, although a number of factors must be considered for this potential to be realized. By highlighting recent progress in the application of chemical biology techniques for the modulation of plant-pathogen interactions, we provide some perspective on the exciting opportunities for future progress in this field of research.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.318.2-318.2
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• 2014

The high contact resistance is still one of the major issues to be resolved in CdS/CdTe thin film solar cells. CdTe/Metal Schottky contact induced a high contact resistance in CdS/CdTe solar cells. It has been reported that the work function of CdTe thin film is more than 5.7 eV. There has not been a suitable back contact metal, because CdTe thin film has a high work function. In a few decades, some buffer layer was reported to improve a back contact problem. Buffer layers which are Te, $Sb_2Te_3$, $Cu_2Te$, ZnTe:Cu and so on was inserted between CdTe and metal electrode. A formed buffer layers made a tunnel junction. Hole carriers which was excited in CdTe film by light absorption was transported from CdTe to back metal electrode. In this report, we reported the variation of solar cell performance with different buffer layer at the back contact of CdTe thin film solar cell.