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Kwang-Su Ock,Ji-Hye Seo,Saeromi Jeong,Erdene-Ochir Ganbold,주상우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.10
CdS nanoparticles (NPs) were synthesized in an aqueous phase in order to investigate their spectral behaviors as efficient fluorescence resonance energy transfer (FRET) donors for various organic dye acceptors. Our prepared CdS NPs exhibiting strong and broad emission spectra between 480-520 nm were able to transfer energy in a wide wavelength region from green to red fluorescence dyes. Rhodamine 6G (Rh6G), rhodamine B (RhB), and sulforhodamine 101 acid (Texas red) were tested as acceptors of the energy transfer from the CdS NPs. The three dyes and synthesized CdS NPs exhibited good FRET behaviors as acceptors and donors,respectively. Energy transfers from the CdS NPs and organic Cy3 dye were compared to the same acceptor Texas red dye at different concentrations. Our prepared CdS NPs appeared to exhibit better FRET behaviors comparable to those of the Cy3 dye. These CdS NPs in an aqueous solution may be efficient FRET donors for various organic dyes in a wide wavelength range between green and red colors.
Ock, Kwang-Su,Ganbold, Erdene Ochir,Park, Jin,Cho, Keunchang,Joo, Sang-Woo,Lee, So Yeong The Royal Society of Chemistry 2012 The Analyst Vol.137 No.12
<P>We investigated glutathione (GSH)-induced purine or pyrimidine anticancer drug release on gold nanoparticle (AuNP) surfaces by means of label-free Raman spectroscopy. GSH-triggered releases of 6-thioguanine (6TG), gemcitabine (GEM), acycloguanosine (ACY), and fadrozole (FAD) were examined in a comparative way by means of surface-enhanced Raman scattering (SERS). The GSH-induced dissociation constant of GEM (or ACY/FAD) from AuNPs was estimated to be larger by more than 38 times than that of 6TG from the kinetic relationship. Tripeptide control experiments were presented to check the turn-off Raman signalling mechanism. Dark-field microscopy (DFM) and transmission electron microscopy (TEM) indicated the intracellular AuNP loads. After their cellular uptake, GEM, ACY, and FAD would not show SERS intensities as strong as 6TG. This may be due to easier release of GEM, ACY, and FAD than 6TG by intracellular reducing species including GSH. We observed fairly strong SERS signals of GEM and 6TG in cell culture media solution. Our CCK-8 cytotoxicity assay data support that 6TG–AuNPs did not exhibit a substantial decrease in cell viability presumably due to strong binding. Label-free confocal Raman spectroscopy can be utilized as an effective tool to access intracellular anticancer drug release.</P> <P>Graphic Abstract</P><P>We investigated glutathione (GSH)-induced purine or pyrimidine anticancer drug release on gold nanoparticle (AuNP) surfaces by means of label-free Raman spectroscopy. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an35170f'> </P>
Ock, Kwang-Su,Ganbold, Erdene-Ochir,Jeong, Sae-Ro-Mi,Seo, Ji-Hye,Joo, Sang-Woo Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.10
CdS nanoparticles (NPs) were synthesized in an aqueous phase in order to investigate their spectral behaviors as efficient fluorescence resonance energy transfer (FRET) donors for various organic dye acceptors. Our prepared CdS NPs exhibiting strong and broad emission spectra between 480-520 nm were able to transfer energy in a wide wavelength region from green to red fluorescence dyes. Rhodamine 6G (Rh6G), rhodamine B (RhB), and sulforhodamine 101 acid (Texas red) were tested as acceptors of the energy transfer from the CdS NPs. The three dyes and synthesized CdS NPs exhibited good FRET behaviors as acceptors and donors, respectively. Energy transfers from the CdS NPs and organic Cy3 dye were compared to the same acceptor Texas red dye at different concentrations. Our prepared CdS NPs appeared to exhibit better FRET behaviors comparable to those of the Cy3 dye. These CdS NPs in an aqueous solution may be efficient FRET donors for various organic dyes in a wide wavelength range between green and red colors.
성수광,구경옥 한국의류학회 1987 한국의류학회지 Vol.11 No.2
Nowadays, the amount used carpets are on the increase, according to the improvement of life-style. The pleasantness of carpet is caused by the properties of pile, because the most carpets are made pile fabric. For that reason, a study on the compressional properties of carpet is very important issue. This study has been carried out to investigate the differences of compressional properties in various acrylic carpets which were Cut, Tufted, Jacquard and Shag. Each acrylic carpets was transformed to 4,6,8 mm of pile height, as results of transformation, we could get the pressure-thickness curve and pressure-deformation curve. The results are summarized as follows. 1. Rate of compression increases, compressive resistance and compressive elasticity decreases, as pile height increases. 2. Regardless of pile height, compressive elasticity reached the limit in recovery period at about 10 minutes. 3. Work of compression increases, as pile height increases. 4. Work of compression decreases, as apparent density increases. 5. Cut-type carpet has the best cushion.
Yang Yeol Oh,Hee Kyoung Ock,Jin Hee Ryu,Su Hwan Lee,Hak Seong Lee,Kwang Seung Lee,Kang Ho Jung,Sung Yung Yoo,Tae Wan Kim,Kil Yong Kim 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.2
Agricultural production in Saemangeum reclaimed land is limited by low organic matter and nutrients content of soil, which lowers crops productivity. One of the best ways to improve soil properties and yield of upland crops are to increase soil organic matter by using organic amendments. To investigate effects of organic amendments on crop productivity and improvement in soil properties, we cultivated maize in an experimental field on Saemangeum reclaimed land with four treatments of compost and chemical fertilizer (FC), chemical fertilizer (F), control (C), and non-cultivation (N). The increments of organic matter (OM), available phosphate, calcium to potassium ratio (Ca/K ratio) was the greatest in FC treatment. Organic matter contents showed an increasing trend with the application of fertilizer and compost to the soil. The organic matter in the FC treatment increased to 6.29 g kg<SUP>-1</SUP>, the highest among the treatments. Available phosphate after the maize harvest was 33 mg kg<SUP>-1</SUP> in the F treatment and was highest in FC treatment, 255 mg kg<SUP>-1</SUP>. The Ca/K ratio in FC and C treatments increased to 4.39 from 2018 to 2020. On the other hand, application of only chemical fertilizer (F) did not affected soil properties. The yield of maize in FC treatment increased by 155% compared with that of control. It was concluded that compost contributed more than only chemical fertilizer in building up the organic matter, phosphorus, and Ca/K ratio status of the soil. Also, Application of chemical fertilizer combined with compost was favorable to increase the content of soil organic matter and available phosphate, and the maize productivity.
Erdene-Ochir Ganbold,Jin-Ho Park,Kwang-Su Ock,주상우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
We studied the detection of the Hg(II) concentration in an aqueous solution using rhodamine dyes on citrate-reduced Au nanoparticles (NPs). The quenching effect from Au NPs was found to decrease as the Hg(II) concentration increased under our experimental conditions. As the fluorescence signals intensified, the surface-enhanced Raman scattering (SERS) intensities reduced on the contrary due to less rhodamine dyes on Au NPs as the Hg(II) concentration increased. The rhodamine 6G (Rh6G) and rhodamine 123 (Rh123) dyes were examined via fluorescence and SERS measurements depending on Hg(II) concentrations. Fast and easy fluorescence detection of an Hg (II) concentration as low as a few ppm could be achieved by naked eye using citrate-reduced Au NPs.
Ganbold, Erdene-Ochir,Park, Jin-Ho,Ock, Kwang-Su,Joo, Sang-Woo Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
We studied the detection of the Hg(II) concentration in an aqueous solution using rhodamine dyes on citrate-reduced Au nanoparticles (NPs). The quenching effect from Au NPs was found to decrease as the Hg(II) concentration increased under our experimental conditions. As the fluorescence signals intensified, the surface-enhanced Raman scattering (SERS) intensities reduced on the contrary due to less rhodamine dyes on Au NPs as the Hg(II) concentration increased. The rhodamine 6G (Rh6G) and rhodamine 123 (Rh123) dyes were examined via fluorescence and SERS measurements depending on Hg(II) concentrations. Fast and easy fluorescence detection of an Hg (II) concentration as low as a few ppm could be achieved by naked eye using citrate-reduced Au NPs.
새만금 간척지와 일반밭 토양에서 뚱딴지(Helianthus tuberosus L.) 재배시 생육 및 이눌린 평가
오양열 ( Yang-yeol Oh ),김승연 ( Seung-yeon Kim ),이광식 ( Kwang-sik Lee ),류진희 ( Jin-hee Ryu ),이수환 ( Su-hwan Lee ),옥희경 ( Hee-kyoung Ock ),정강호 ( Kang-ho Jung ),강방훈 ( Bang-hun Kang ),김길용 ( Kil-yong Kim ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.3
BACKGROUND: In order to cultivate upland crops in reclaimed land, economically appropriate crops should be selected. Jerusalem artichoke (Helianthus tuberosus L.) is one of the primary sources for inulin in higher plants. The objective of this study was to evaluate and compare growth and inulin of H. tuberosus L. according to the cultivation region in Korea. METHODS AND RESULTS: 21 varieties of H. tuberosus L. were collected in Korea, and then 7 varieties of H. tuberosus L. were selected for this study. To compare growth and inulin, those varieties were cultivated in reclaimed land and upland soils. The growth of H. tuberosus L. significantly decreased when cultivated in reclaimed land. There was an increas at 17.8% in the content of white H. tuberosus L. tuber inulin in reclaimed land. CONCLUSION: The content of inulin in H. tuberosus L. tubers was found to be dependent on cultivation region and tuber color. There was a difference of the inulin content between the tubers with different colors in reclaimed land. Purple tubers of P20 were considered suitable varieties for cultivation in reclaimed land. White tubers of W1 and W8 were also considered suitable varieties for cultivation in reclaimed land.