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        검색결과 21

        1.
        2021.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The (Ga1-xZnx)(N1-xOx) solid solution is attracting extensive attention for photocatalytic water splitting and wastewater treatment owing to its narrow and controllable band gap. To optimize the photocatalytic performance of the solid solution, the key points are to decrease its band gap and recombination rate. In this study, (Ga1-xZnx)(N1-xOx) nanofibers with various Zn fractions are prepared by electrospinning followed by calcination and nitridation. The effect of the composition and crystallinity of electrospun oxide nanofibers on the morphology and optical properties of the obtained solid-solution nanofibers are systematically investigated. The results show that the final shape of the (Ga1-xZnx) (N1-xOx) material is greatly affected by the crystallinity of the oxide nanofibers before nitridation. The photocatalytic properties of (Ga1-xZnx)(N1-xOx) with different Ga:Zn atomic ratios are investigated by studying the degradation of rhodamine B under visible light irradiation.
        4,000원
        2.
        2020.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Salmonella Enteritidis (SE) infection, one of a major foodborne disease remains considerable public health concerns globally. In this study, we have constructed that the genetically inactivated SE ghost vaccine candidate, JOL2220 (Δlon ΔcpxR Δasd), which express the immunogenic hemagglutinin portion (HA1) of H1N1 virus on the Salmonella surface. The lysis gene cassette, holin-endolysin system originated from double DNA bacteriophage λ was cloned into the ghost vector plasmid pJHL464, which activated under the control of the convergent promoter system. Scanning electronic microscopic examination revealed that transmembrane tunnels of JOL2220 was formed following the 48 hr of the lysis mediated by the holin-endolysin system. In vitro expression of HA1 antigenic protein was also determined by Western blot analysis. The Chickens immunized with JOL2220 ghost via intramuscular and oral routes showed significant increase in IgG level against both SE and HA1 antigen. Further, we observed markedly enhancement of lymphocyte proliferation and T-cell differentiation in the primed PBMC of the immunized chicken, compared to those in the control group. Collectively, the results indicated that the SE ghosts expressing HA1 antigen may have immunostimulatory properties against Salmonella and influenza infection where the chicken is the predominant reservoir.
        4,000원
        6.
        2015.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Galaxy clusters, the largest gravitationally bound systems, are an important subject of study to place constraints on cosmological models. Moreover, they are excellent places to test galaxy evolution models in connection to their environments. To date, massive clusters have been found unexpectedly (Kang & Im 2009; Gonzales et al. 2012) and the evolution of galaxies in clusters is still controversial (Elbaz et al. 2007; Faloon et al. 2013). Finding galaxy cluster candidates at z > 1 in a wide, deep imaging survey data will enable us to solve such issues of modern extragalactic astronomy. We report new candidate galaxy clusters in one of the wide and deep survey fields, the European Large Area ISO Survey North1 (ELAIS-N1) and North2 (ELAIS-N2) fields, covering a sky area of 8.75 deg2 and 4.85 deg2 each. We also suggest a new useful color selection technique to separate z > 1 galaxies from low - z galaxies by combining multi-wavelength data.
        3,000원
        12.
        2012.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        During the past dozens of years, animal species indigenous to Korea has been emerged as a symbol of healthy and well-being lifestyle. Developing new cross hybrid and making brand in Korean native chickens serve as an example of pursuing a well-being life. However, lack of systematic management. intervention from the small scaled middlemen during the multi-stages of marketing, poor hygiene at moorings and live bird market, and possibility of contacting to wild birds have been pointed out as risk factors to the outbreaks of highly pathogenic avian influenza ([1PM), especially for small back yard flocks. This study describes the schema of husbandry and marketing on Korean native chickens, and their putative associations with the outbreaks of RPM during the last two big epidemics occurred in the Republic of Korea, which were in the year of 2008 and 2010/2011.
        4,000원
        13.
        2011.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Korea had experienced second epidemic highly pathogenic avian influenza (HPAI), and there were the seven affected farms, including two breeder duck farms, from 22nd November 2006 to 6th March 2007. Here, we reported the clinico-pathological characteristics of domestic breeder ducks farms naturally infected with HPAI virus (H5N1). Clinically, the most ducks showed various signs from depression, decreased egg production and feed consumption to even, death. The most commonly gross changes were hepatomegaly, splenomegaly, petechial and ecchymotic hemorrhage on the liver surface, a white stripe on the cardiac muscle, and severely hemorrhagic and deformed eggs. The most significant histopathological changes were necrosis of various cells such as neuron, lymphocytes, cardiac myocytes, hepatocytes, blood vessels and pancreatic acinar epithelium. The viral antigen was mainly detected in the endothelium of blood vessels of various organs and tissues, peripheral nerves and neuronal cells. Based on the above results, we identified that HPAI H5N1 induced systemic infection in the adult breeder ducks.
        4,000원
        14.
        2010.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Since there had been the first human outbreak of novel influenza A/H1N1 in Mexico, it has become pandemic throughout the world. In the Republic of Korea, the first human case was on May, 2009 and National Veterinary Research and Quarantine Service (NVRQS) has started monitoring novel influenza A/H1N1 on domestic swine farms. The first positive case was detected on 14, Dec, 2009 and until now, we have had total 17 positive cases. From the first case, we did epidemiological investigation on introduction and transmission of virus to pigs. We have concluded that virus had been introduced from humans to pigs, possibly from October to November, 2009 in our country. There were direct and indirect factors including the vehicles transporting veterinary medicine, feed, etc. related to transmission of virus from farm to farm. However, breeding pigs seem to be extrinsic to transmitting factors. Upon the epidemiological investigation, the off-limits of visitors to farms and the disinfection is thought to be critical for blocking the introduction and transmission of novel influenza A/H1N1. In addition, collecting and analyzing the genetic informations of influenza virus is important for predicting and handling the new pandemic influenza in the future.
        4,000원
        15.
        2009.03 구독 인증기관 무료, 개인회원 유료
        To search a new pig pheromonal odorant, the N1-allyl-N2-(tetrahydrofuran-2-ylmethyl)oxalamide molecule predicted by ligand based approach and molecular docking method was synthesized by nucleophilic addition-elimination reaction (AdNU-E) between N-allyloxalamic acid ethylester and tetrahydrofurylmethylamine. According to the evaluation results for efficiency of pig estrus control, the synthesized pig pheromonal N1-allyl-N2-(tetrahydrofuran-2- ylmethyl)oxalamide molecule advanced the estrus by 11.3 days (p<0.05) compared with the non-pheromone group. And from these results, it is predicted that the synthesized pig pheromonal compound will be able to increase the reproduction efficiency of pig.
        4,000원
        18.
        2012.12 KCI 등재 서비스 종료(열람 제한)
        농가를 방문하는 가금관련업체의 관계자 및 차량은 HPAI 질병 확산의 매개체가 된다. 농가들의 가금관련업체 이용 정보를 이용하면 농가간의 연결을 확인할 수 있고 HPAI 확산 가중 네트워크를 구성할 수 있다. 네트워크 분석중 중심성 측정은 질병에 취약하거나 타 농가에 영향력이 큰 역할을 하는 농가를 분석하는 방법으로 HPAI 초기 확산을 통제하는 방법으로 이용된다. 단, HPAI 바이러스는 네트워크의 연결선 가중치에 따라서 확산 경로가 달라질 수 있다.
        19.
        2011.03 KCI 등재 서비스 종료(열람 제한)
        This paper aims to explore Korean genitive noun phrases ``N1의 N2`` that are also translated in French as genitive noun phrases ``N2 de N1``. My discussion centers on describing two things: (a) What are linguistic factors by which N1 and N2 in Korean not accompanying any article are respectively preceded by one of the two articles: the indefinite article and the definite article. (b) What are linguistic environments by which N1 and N2 in Korean can be respectively translated in French as one of the four noun phrases: generic noun phrases, specific noun phrases, non-specific noun phrases and predicative noun phrases.
        20.
        2010.04 KCI 등재 서비스 종료(열람 제한)
        The influenza neuraminidase (E.C. 3.2.1.18) is an antiviral target of high pharmaceutical interest because of its essential role in cleaving sialic acid residues from surface glycoproteins and facilitating release of virions from infected cell. In this context, polyphenolic compounds including luteolin, rosmarinic acid, and apigenin from Perilla frutescens were evaluated for their inhibitory effect on recombinant virus H1N1 neuraminidase. Among the test compounds, luteolin and rosmarinic acid inhibited the rvH1N1 neuraminidase with an IC50 of 8.4 and 46.7 μM, respectively. The inhibition kinetics analyzed by Dixon plots indicates that luteolin and rosmarinic acid are noncompetitive inhibitor and inhibition constant, Ki, were established as 14.3 and 43.9 μM, respectively. Subsequently, we also analyzed the rosmarinic acid and luteolin contents of 383 accessions of perilla seed germplasms by high performance liquid chromatography (HPLC). The rosmarinic acid and luteolin contents of perilla seeds were ranged from 15.7 μg/g to 2,894.9 μg/g and from 1.6 μg/g to 949.1 μg/g, respectively.
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