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LPE법으로 작성한 산화물초전도체 Bi₂Sr₂-Ca₁+Cu₂ 막(films) 의 초전도특성
신재수,황선아,이종용,이권재 대전대학교 기초과학연구소 1997 自然科學 Vol.8 No.2
LPE(Liquid press epitaxy)법을 이용하여, Sr과 Ca가 서로 상호 치환된 산화물초전도체 Bi₂Sr₂??Ca₁+x??Cu₂O??(x?=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) 막(film)을 작성하여 상호치환 상태와 초전도특성과의 관계를 알아보았다. 작성한 막(film)의 조성비은 융액조성비(x?)와 막(film)속의 조성비(x?)가 비례함을 알 수 있었고, c-축으로 강하게 배향된전형적인 Bi2212상의 단일상(singe-phase)을 보였다. 치환량 x?의 증가에 따라, 임계온도 T??, c-축의 길이, carrier농도 등은 단조로이 감소하고 있음을 알 수 있었다. We investigated the superconductivity of Bi₂Sr₂_Ca₁+x?Cu₂O?+?x?=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) films by liquid phase epitaxial method. X-ray diffraction measurements revealed that films were predominantly oriented with the c-axis perpendicular to the substrate surfaces. The zero-resistance temperature and the lattice parameter c linearly decreased with the increase of x?, corresponding to the decrease of the carrier concentration.
Degradation of Veterinary Antibiotic Oxytetracycline Using Electron Ionizing Energy
Hwang, Seon Ah,Lee, Kyeong-Bo,Cho, Jae Young The Korean Society for Applied Biological Chemistr 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Electron ionizing energy was used to determine the degradation rate and degraded products of oxytetracycline in aqueous solutions. The degradation efficiency on oxytetracycline after irradiation with electron ionizing energy was 72.2% at 1 kGy, 99.2% at 5 kGy, and 100% at 10 kGy. The degraded products of oxytetracycline after irradiation with electron ionizing energy were OTC1 ([M+H] m/z 447.2), OTC2 ([M+H] m/z 433.2) and OTC3 ([M+H] m/z 415.2). The results demonstrate that the irradiation technology using electron ionizing energy is an effective means to remove veterinary antibiotics in aquatic ecosystem.
Degradation of Veterinary Antibiotic Oxytetracycline Using Electron Ionizing Energy
Seon-Ah Hwang,조재영,이경보 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Electron ionizing energy was used to determine the degradation rate and degraded products of oxytetracycline in aqueous solutions. The degradation efficiency on oxytetracycline after irradiation with electron ionizing energy was 72.2% at 1 kGy,99.2% at 5 kGy, and 100% at 10 kGy. The degraded products of oxytetracycline after irradiation with electron ionizing energy were OTC1 ([M+H] m/z 447.2), OTC2 ([M+H] m/z 433.2) and OTC3 ([M+H] m/z 415.2). The results demonstrate that the irradiation technology using electron ionizing energy is an effective means to remove veterinary antibiotics in aquatic ecosystem.
Cheon, Seon Ah,Bal, Jyotiranjan,Song, Yunkyoung,Hwang, Hai‐,min,Kim, Ah Ruem,Kang, Woo Kyu,Kang, Hyun Ah,Hannibal‐,Bach, Hans K.,Knudsen, Jens,Ejsing, Christer S.,Kim, Jeong‐,Yoon Blackwell Publishing Ltd 2012 Molecular microbiology Vol.83 No.4
<P><B>Summary</B></P><P>Lag1p and Lac1p catalyse ceramide synthesis in <I>Saccharomyces cerevisiae.</I> This study shows that Lag1 family proteins are generally required for polarized growth in hemiascomycetous yeast. However, in contrast to <I>S. cerevisiae</I> where these proteins are functionally redundant, <I>C. albicans</I> Lag1p (CaLag1p) and Lac1p (CaLac1p) are functionally distinct. Lack of CaLag1p, but not CaLac1p, caused severe defects in the growth and hyphal morphogenesis of <I>C. albicans</I>. Deletion of <I>CaLAG1</I> decreased expression of the hypha‐specific <I>HWP1</I> and <I>ECE1</I> genes. Moreover, overexpression of <I>CaLAG1</I> induced pseudohyphal growth in this organism under non‐hypha‐inducing conditions, suggesting that CaLag1p is necessary for relaying signals to induce hypha‐specific gene expression. Analysis of ceramide and sphingolipid composition revealed that CaLag1p predominantly synthesizes ceramides with C24:0/C26:0 fatty acid moieties, which are involved in generating inositol‐containing sphingolipids, whereas CaLac1p produces ceramides with C18:0 fatty acid moieties, which are precursors for glucosylsphingolipids. Thus, our study demonstrates that CaLag1p and CaLac1p have distinct substrate specificities and physiological roles in <I>C. albicans</I>.</P>
논에서 볏짚과 볏짚퇴비 연용에 의한 토양 이화학적 특성과 벼 품질 변화
황선아 ( Seon Ah Hwang ),배희수 ( Hui Su Bae ),이수환 ( Soo Hwan Lee ),강종국 ( Jong Gook Kang ),김홍규 ( Hong Kyu Kim ),이경보 ( Kyeong Bo Lee ) 전북대학교 농업과학기술연구소 2013 농업생명과학연구 Vol.44 No.2
This experiment was initiated in 1979 to investigate the effects of long-term application of rice straw and rice straw compost with different levels of nitrogen fertilizer in paddy field. The organic matters were applied 5 Mg/ha/year as rice straw and 10 Mg/ ha/year as rice straw compost, respectively. The application rates of nitrogen fertilizer were 0, 100, 150, 200, and 250 kg/ha/year per type of organic matters. This study was investigated effect of different treatments on soil properties and rice quality. In 2009- 2011, after 31-33 years of experiment, the long-term application of organic matters tended to high the soil pH and to increase organic matter and available phosphate contents. The organic matter, available phosphate, exchangeable cations and available silicate were greater increasing in treatment of rice straw compost than of rice straw. The soil physical properties were improved by application of organic matters and more effective in treatment of rice straw compost than of rice straw. Distribution of water stable aggregate (above 2mm) were increased by long-term application of organic matter and its effect was higher in treatment of rice straw than of rice straw compost. The application of organic matters resulted in the increase in rice yield and it was more effective to apply rice straw compost.