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Anti-Helicobacter pylori effects of IgY from egg york of immunized hens
Yun-Hui Yang,Dongsun Park,Goeun Yang,Sun Hee Lee,Dae Kwon Bae,Jangbeen Kyung,Dajeong Kim,Ehn-Kyoung Choi,Jae-Cheol Son,Seock-Yeon Hwang,Yun-Bae Kim 한국실험동물학회 2012 Laboratory Animal Research Vol.28 No.1
Effects of egg york containing IgY specific for Helicobacter pylori on the bacterial growth and intragastric infection were investigated in comparison with a proton-pump inhibitor pantoprazole. For in vitro antibacterial activity test, H. pylori (1*108 CFU/mL) was incubated with a serially diluted IgY for 3 days. As a result, IgY fully inhibited the bacterial growth at 16 mg/mL, which was determined to a minimal inhibitory concentration. In vivo elimination study, male C57BL/6 mice were infected with the bacteria by intragastric inoculation (1*108 CFU/mouse) 3 times at 2-day intervals, and 2 weeks later, orally treated twice a day with 50, 100, 200 or 500 mg/kg IgY for 18 days. After the final administration, biopsy sample of the gastric mucosa was assayed for the bacterial identification via urease, oxidase, catalase, nitrate reduction and H2S tests in addition to microscopic examination for mucosal inflammation. In CLO kit test, 75, 50, 12.5 and 12.5% of the animals revealed positive reaction following treatment with 50, 100, 200 and 500 mg/kg IgY, respectively, resulting in a superior efficacy at 200 mg/kg than 30 mg/kg pantoprazole that displayed 75% elimination. The CLO test results were confirmed by bacterial identification. Microscopic examination revealed that H. pylori infection caused severe gastric mucosal inflammation, which were not observed in the CLO-negative mice following treatment with IgY or pantoprazole. Taken together, IgY inhibited the growth of H. pylori, and improved gastritis and villi injuries by eliminating the bacteria from the stomach. The results indicate that IgY could be a good candidate overcoming tolerance of antibiotics for the treatment of H. pylori-mediated gastric ulcers.
Yang, Jae-Hun,Pei, Yi-Rong,Kim, Seung-Joo,Choi, Goeun,Vinu, Ajayan,Choy, Jin-Ho American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.48
<P>The Ga/Zn oxynitride solid solution [(GaN)<SUB>1-<I>x</I></SUB>(ZnO)<SUB><I>x</I></SUB>] is one of the promising visible light harvesting photocatalysts for overall water splitting. A series of (GaN)<SUB>1-<I>x</I></SUB>(ZnO)<SUB><I>x</I></SUB> (0.11 ≤ <I>x</I> ≤ 0.33) compounds are synthesized by calcining the carbonate-type Zn/Ga-LDH precursor with and without sodium carbonate flux at 850 °C for 8-14 h under a NH<SUB>3</SUB> gas flow. The solid solutions without flux are determined to be low in crystallinity, but platelike morphology with preferred orientation could be observed. On the other hand, those with flux turn out to be better in crystallinity, and eventually exhibit significantly higher photocatalytic activity for overall water splitting under visible light irradiation than those without flux. In addition, the band gap energies can also be engineered from 2.57 to 2.72 eV by changing a synthetic parameter such as nitridation time. It is, therefore, suggested that the present new approach can offer new opportunities for designing the next generation of photocatalytic systems.</P> [FIG OMISSION]</BR>
Park, Dongsun,Yang, Goeun,Bae, Dae Kwon,Lee, Sun Hee,Yang, Yun‐,Hui,Kyung, Jangbeen,Kim, Dajeong,Choi, Ehn‐,Kyoung,Choi, Kyung‐,Chul,Kim, Seung U.,Kang, Sung Keun,Ra, Jeong Chan,Kim, Wiley Subscription Services, Inc., A Wiley Company 2013 JOURNAL OF NEUROSCIENCE RESEARCH - Vol.91 No.5
<P><B>Abstract</B></P><P>Brain ageing leads to atrophy and degeneration of the cholinergic nervous system, resulting in profound neurobehavioral and cognitive dysfunction from decreased acetylcholine biosynthesis and reduced secretion of growth and neurotrophic factors. Human adipose tissue‐derived mesenchymal stem cells (ADMSCs) were intravenously (1 × 10<SUP>6</SUP> cells) or intracerebroventricularly (4 × 10<SUP>5</SUP> cells) transplanted into the brains of 18‐month‐old mice once or four times at 2‐week intervals. Transplantation of ADMSCs improved both locomotor activity and cognitive function in the aged animals, in parallel with recovery of acetylcholine levels in brain tissues. Transplanted cells differentiated into neurons and, in part, into astrocytes and produced choline acetyltransferase proteins. Transplantation of ADMSCs restored microtubule‐associated protein 2 in brain tissue and enhanced Trk B expression and the concentrations of brain‐derived neurotrophic factor and nerve growth factor. These results indicate that human ADMSCs differentiate into neural cells in the brain microenvironment and can restore physical and cognitive functions of aged mice not only by increasing acetylcholine synthesis but also by restoring neuronal integrity that may be mediated by growth/neurotrophic factors. © 2013 Wiley Periodicals, Inc.</P>
고대 천문기록과 정치적 환경과의 상관관계 연구 - 유성과 유성우 기록을 중심으로 -
양홍진,최고은,Yang, Hong-Jin,Choi, Goeun 한국천문학회 2012 天文學論叢 Vol.27 No.5
We study the correlation between distributions of astronomical records and historical events using historical meteor (shower) records. In Korean chronicles, planets and meteor (shower) records are the most abundant astronomical phenomena. And they represent a general tendency of the number distribution of whole astronomical observations. We examine the correlation for the number distribution between meteors (showers) and planets during A.D. 1200-1700 and find that both records have a similar distribution. We classify historical events into three grades according to the social impact, and investigate the correlation between distributions of meteor (shower) records with social events, such as, new king's accession to the throne, foreign invasions, and domestic turmoils. From the statistical analysis, we cannot find any correlation between the meteor (shower) records and the political events. Therefore, we conclude that Korean historical records have not been influenced by the political events. We also examine the correlation between Chinese and Japanese meteor (shower) records and political events for A.D. 1200-1700, respectively, but cannot find any correlations between them.