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Seo, Min Ho,Lim, Eun Ja,Choi, Sung Mook,Nam, Sang Hoon,Kim, Hyung Ju,Kim, Won Bae Elsevier 2011 International journal of hydrogen energy Vol.36 No.18
<P><B>Abstract</B></P><P>Polypyrrole composition over carbon-supported palladium nanoparticles (Pd-PPy/C) is successfully performed as electrocatalysts for acid-based fuel cell. This approach demonstrates that PPy modification on a Pd surface remarkably suppresses the deactivation of Pd under acidic conditions. We attempted to determine the influence of PPy on the Pd surface with respect to stability. For this purpose, a potential cycling test and inductively coupled plasma mass spectrometry (ICP–MS) analysis are applied to this system to investigate how PPy affects Pd surface area loss by dissolution and particle growth/agglomeration. The electronic structure of the catalysts is also analyzed with X-ray absorption-near-edge spectroscopy (XANES) and X-ray photoelectron spectroscopy (XPS). The increase in stability upon PPy modification of Pd nanoparticles can be interpreted as a result of the redox properties of PPy polymer itself because the electronic interaction of Pd and PPy doesn’t reveal a shifting of the d-band center (<I>ϵ</I><SUB>d</SUB>). Consequently, our work may suggest that conjugated polymer-composited metal catalysts are good potential candidate in the development of efficient electrocatalysts because of the possibility of electrochemical role of the conjugated polymer.</P> <P><B>Highlights</B></P><P>► Synthesis of the conjugated polymer-composited Pd nanoparticle on carbon support. ► Stability enhancement of Pd nanoparticles in practical PEMFC condition. ► Suppressed dissolution and particle growth of Pd by modification of polypyrrole.</P>
Multiple Cavitary Pulmonary Nodules Caused by Mycobacterium intracellulare
Sang Hoon Yoo,Seo Ree Kim,Joon Young Choi,Jae Woo Choi,Yu Mi Ko,Sun Hee Jang,Jun Kyu Park,Ye Gyu Sung,Yun Jung Park,Su Yun Oh,Se Young Bahk,Ju Hyun Lee,Myung Sook Kim 대한가정의학회 2016 Korean Journal of Family Medicine Vol.37 No.4
Nontuberculous mycobacteria (NTM) have been increasingly recognized as an important cause of chronic pulmonary infections. The Mycobacterium avium complex (MAC), which is composed of two species, Mycobacterium avium and Mycobacterium intracelluare, is the most commonly encountered pathogen associated with NTM lung disease. MAC pulmonary infection typically presents in a fibrocavitary form or a nodular bronchiectatic form. However, there have been atypical presentations of MAC pulmonary infections, including solitary pulmonary nodules (SPN). There have been several previous reports of SPN due to MAC infection in the United States, Japan, and Korea. In 2009, Sekine and colleagues reported a case of MAC pulmonary infection presenting with multiple nodules. To date, however, there have been no cases of NTM lung infection with multiple cavitary pulmonary nodules, and neither a fibrotic change nor nodular bronchiectasis. The present case showed a multiple cavitating nodular lung infection due to MAC, which is very rare and different from the typical presentation of MAC pulmonary infections. We also showed that percutaneous transthoracic needle aspiration can be a useful diagnostic tool to evaluate a case of multiple cavitary nodules.
Sung Woo Lee,Kyung Hoon Park,Seung Ho Lee,In Bok Jang,Jin Mei Lan,Moon Won Seo,Dong Yun Hyun 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : The fungus Cylindrocarpon destructans (Zins) Scholten is the cause of root rot in many ginseng production areas. Root exudate composition and quantity vary in relation to plant nutritional status, but the impact of the differences on rhizosphere microbial communities is not known. Methods and Results : Five kinds of rotation crops, sudan grass soybean peanut sweet potato, perilla were grown for one year in ginseng garden harvested 6-year-old ginseng. The ratio of gram-negative bacteria, fungi, bacteria, total microbial biomass, aerobic/anaerobic microbes were increased by rotational crop cultivation, while the ratio of actinomycetes and the ratio of saturated to unsaturated fatty acids were decreased. The increase in the fungal density or the increase in the proportion of fungi to the bacteria tended to increase the incidence of root rot, but there was no significant difference. The yield of ginseng root showed a highly significant negative correlation with actinomycetes. The correlation between the soil chemical properties and the incidence of root rot was analyzed by cultivating 23 kinds of green manure crops for one year in field where cultivated ginseng continuously. The survival rate of ginseng showed a highly significant positive correlation with soil acidity and a highly significant negative correlation with nitrate nitrogen, and a significant negative correlation with soil salt concentration. Conclusion : Rotation crops improved soil microbial communities, lowered the rate of fungi and increased the proportion of bacteria, the survival rate of ginseng was significantly correlated with soil acidity, nitrate nitrogen and soil salinity.
연작지에서 녹비작물 재배가 인삼뿌리썩음병 발생에 미치는 영향
Sung Woo Lee,Kyung Hoon Park,Seung Ho Lee,In Bok Jang,Jin Mei Lan,Moon Won Seo,Dong Yun Hyun 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background: Some plants have harmful effects on fungi and bacteria as well as plants. Incorporating into soil as green manures are effective in reducing population densities of soil pathogens. Methods and Results: Twenty-three species of green manure crops were cultivated after the harvest of 6-year-old ginseng and then incorporated green manure into the soil at the flowering stage. The following year, the root rot ratio of 2-year-old ginseng and soil chemical properties were investigated. Sorghum sudanense, Helianthus annuus, and Helianthus tuberosus were relatively high in dry matter production. Without incorporating green manure into soil, NO3, EC (electric conductivity) and K were decreased by 95%, 79% and 65%, respectively. When green manure was incorporated to soil, P2O5 and NO3, were reduced by 41% and 25%, respectively. The survived root ratio of 2-year-old ginseng were significantly increased by 56.2%, 47.5%, and 47.3% in Sorghum sudanense, Ricinus communis and Helianthus tuberosus, respectively, In addition, there was a significant increase in Secale cereale, Chrysanthemum morifolium, Atractylodes macrocephala, and Smallanthus sonchifolius. The survived root ratio of ginseng showed a significant positive correlation with soil pH and a negative correlation with NO3, and EC. Conclusion: Cultivation of Chrysanthemum family mainly using rhizome and root as green manure was effective for root rot disease of ginseng.
Role of Nitric Oxide in Pepsinogen Secretion from Rat Gastric Chief Cells
SUNG, Dae Suk,SEO, Dong Wan,CHOI, Don Woong,AHN, Seong Hoon,HONG, Sung Youl,LEE, Hoi Young,HAN, Jeung Whan,LEE, Hyang Woo 성균관대학교 약학연구소 1999 成均藥硏論文集 Vol.11 No.-
Abstract-Nitric oxide (NO), a cellular messenger synthesized from L-arginine by NO synthase (NOS, EC.1.14.13.39), is considered to be a regulator of gastric secretion. In the present study, the role of NO in the regulation of exocrine secretion was investigated in rat gastric chief cells. Treatment of chief cells with carbachol resulted in an increase in the arginine conversion to citrulline, the amount of NO_X, the release of pepsinogen, and the level of cGMP. Especially, carbachol-stimulated increase of arginine to citrulline transformation, the amount of NO_X, cGMP level and the release of pepsinogen were partially reduced by the natural NOS inhibitor, N^G-monomethyl-L-arginine (MMA) and N^G,N^G-dimethyl-L-arginine (DMA). Furthermore, MMA-and DMA-induced decrease of pepsinogen secretion showed dose-dependent pattern. Activation of NOS is one of the early events in receptor-mediated cascade of reactions in gastric chief cells and NO, not completely, but partially mediates gastric secretion. Agonist-stimulated pepsinogen secretion in chief cells has been considered to be mediated in adenosine 3',5'-cyclic monophosphate pathway and/or guanosine 3',5'-cyclic monophosphate (cGMP) pathway. Taken together, the above results suggest that partial decrease of exocrine secretion following treatment of NOS inhibitor may result from the inactivation of NOS and subsequent guanylate cyclase, and NO/cGMP pathway may play a pivotal role in exocrine secretion.