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페놀분해 효모 Candida tropicalis PW-51의 분리 및 분해특성
김성빈,김치경,김희식,이창호,신기선,권시석,윤병대,오희목 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6
본 연구는 페놀과 포름알데히드를 포함하는 페놀계수지 산업폐수의 생물학적 처리에 이용할 목적으로 포름알데히드의 존재하에서 페놀분해능이 우수한 효모를 sludge로부터 분리하여, 형태적 및 생리 생화학적 특징을 조사하여 Candida tropicalis PW-51로 동정하였다. 회분식 배양에서 C. tropicalis PW-51의 페놀 분해한계는 2,000 mg/ℓ이며, 58시간내에 완전히 분해하였다. C. tropicalis PW-51은 초기접종량이 9×10 exp (6) cells/㎖, 배양온도는 30℃, pH는 7.0에서 페놀 분해효율이 높았으며, 500~2,000 mg/ℓ의 페놀농도에서 조사된 페놀에 대한 평균 분해율은 페놀 1,000 mg/ℓ에서 45.5 mg/ℓ/h 가장 높았다. C. tropicalis PW-51의 페놀분해시 catechol 1,2-dioxygenase의 활성이 크게증가하므로 ortho-path-way에 의해 페놀을 분해하는 것으로 판단되었다. 따라서, C. tropicalis PW-51는 페놀계 수지 산업폐수의 생물학적 처리에 효과적으로 이용될 수 있는 균주로 사료된다. For the biological treatment of phenolic resin wastewater containing phenol and formaldehyde, a phenol-degrading yeast was isolated from the papermill sludge, and then identified as Candida tropicalis PW-51 according to morphological, physiological and biochemical properties. The strain was able to degrade high phenol concentrations up to 2,000 mg/ℓ within 58 hours in batch cultures. Phenol-degrading efficiency by the strain was maximum at the culture conditions of a final concentration of 9×10 exp (6) cells/㎖ 30℃ and pH 7.0. The mean degradation rate of phenol was highest at 45.5 mg/ℓ/h in 1,000 mg/ℓ phenol from 500 mg/ℓ to 2,000 mg/ℓ phenol. Because the enzyme activity of catechol 1,2-dioxygenase increased in the course of degradation of phenol, it seems that this strain degrades phenol via the ortho-cleavage of benzene ring. The isolate C. tropicalis PW-51 could be effectively used for the biological treatment of phenolic resin wastewater.
Kwon, Seok Bin,Choi, Seung Hee,Yoo, Jung Hyeon,Jeong, Seong Guk,Song, Young Hyun,Yoon, Dae Ho Elsevier 2018 Optical Materials Vol.80 No.-
<P><B>Abstract</B></P> <P>A cellulose-assisted, liquid-phase precursor (LPP) was used to synthesize a YAG phosphor radiating near 530 nm with a particle size of 400 nm, which may be implemented in many applications. The mixture of the materials was homogeneous, and the cellulose-assisted LPP method involved a liquid-phase reaction at a lower temperature compared to a solid-state reaction (SSR). The reaction was performed at 1200, 1300 and 1400 °C, and the composition ratio of the samples was controlled based on yttrium (L1: 2.7, L2: 2.8, L3: 2.9, L4: 2.95, and L5: 3.1 M). ∼400 nm particles were obtained at 1200 °C and ∼1 μm at 1300 °C. At 1200 °C, the PL intensity was the highest in the Y<SUB>3.1</SUB>Al<SUB>5</SUB>O<SUB>12</SUB> sample. At 1300 and 1400 °C, the strongest intensity was evident in the Y<SUB>2.9</SUB>Al<SUB>5</SUB>O<SUB>12</SUB> sample. The XRD patterns for all temperatures showed a YAG phase in JCPDS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> YAG: Ce powder synthesized by cellulose assisted liquid precursor process method. </LI> <LI> Luminescence and crystal structure characteristics of YAG: Ce with non-stoichiometric composition. </LI> <LI> Optical properties of ceramic plate fabricated with synthesized YAG: Ce powder. </LI> <LI> Optical properties of ceramic plate by particle size of YAG: Ce powder. </LI> </UL> </P>
Design of binder-free phosphor paste for warm white LEDs
Kwon, Seok Bin,Jeong, Seong Guk,Choi, Seung Hee,Yoo, Jung Hyeon,Yang, Woo Seok,Yoo, Jin Sun,Song, Young Hyun,Yoon, Dae Ho Elsevier 2018 Optical Materials Vol.84 No.-
<P><B>Abstract</B></P> <P>Cerium-doped yttrium aluminum garnet (YAG: Ce) is used to convert blue light which is emitted from InGaN-based LED chip for white light. In this study, the phosphor paste was prepared using monodispersed spherical YAG: Ce phosphor synthesized by co-precipitation based on one-pot synthesis. Also, orange-red emitting Sr<SUB>2</SUB>Si<SUB>5</SUB>N<SUB>8</SUB>:Eu<SUP>2+</SUP> (SSN: Eu) phosphor was added to confirm the change in optical characteristics. Alpha terpineol was used as a paste solvent because it enabled easy screen-printing. Phosphor paste films for optoelectronic devices were prepared by coating on a glass substrate using a doctor blade method. We compared the conversion efficacy, color rendering index (CRI), and correlated color temperature (CCT) of YAG: Ce which is added to various amounts of SSN: Eu. We measured scanning electron microscopy (SEM) images to confirm the difference of porosity between, depending on binder addition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricated phosphor paste without binding for white LEDs. </LI> <LI> Binder-free phosphor paste was fabricated, which is must be improved fill the pore for luminous efficiency. </LI> <LI> We believe that our results will become applications of warm white LEDs. </LI> </UL> </P>
Kwon, Seung-Hwan,Lee, Ha-Kyung,Kim, Ji-Ah,Hong, Sa-Ik,Kim, Hyoung-Chun,Jo, Tae-Hyung,Park, Young-In,Lee, Chong-Kil,Kim, Yong-Bin,Lee, Seok-Yong,Jang, Choon-Gon Elsevier 2010 european journal of pharmacology Vol.649 No.1
<P><B>Abstract</B></P><P>Chlorogenic acid is a major polyphenolic component of many plants and beverages, and is particularly abundant in coffee. We evaluated the neuroprotective effects of chlorogenic acid on learning and memory impairment induced by scopolamine (0.5mg/kg, i.p.), a muscarinic antagonist, using the Y-maze, passive avoidance, and Morris water maze tests. The chlorogenic acid significantly improved the impairment of short-term or working memory induced by scopolamine in the Y-maze test, and significantly reversed cognitive impairments in mice as measured by the passive avoidance test. In addition, chlorogenic acid decreased escape latencies in the Morris water maze test. In a probe trial session, chlorogenic acid increased the latency time in the target quadrant in a dose-dependent manner. <I>Ex vivo</I>, chlorogenic acid inhibited acetylcholinesterase activity in the hippocampus and frontal cortex. Chlorogenic acid also decreased malondialdehyde levels in the hippocampus and frontal cortex. <I>In vitro</I>, chlorogenic acid was found to inhibit acetylcholinesterase activity (IC<SUB>50</SUB>=98.17μg/ml) and free radical scavenging activity (IC<SUB>50</SUB>=3.09μg/ml) in a dose-dependent manner. These results indicate that chlorogenic acid may exert anti-amnesic activity via inhibition of acetylcholinesterase and malondialdehyde in the hippocampus and frontal cortex.</P>
Reassortant Clade 2.3.4.4 Avian Influenza A(H5N6) Virus in a Wild Mandarin Duck, South Korea, 2016
Kwon, Jung-Hoon,Lee, Dong-Hun,Swayne, David E.,Noh, Jin-Yong,Yuk, Seong-Su,Erdene-Ochir, Tseren-Ochir,Hong, Woo-Tack,Jeong, Jei-Hyun,Jeong, Sol,Gwon, Gyeong-Bin,Lee, Seok,Song, Chang-Seon U.S. Department of Health and Human Services * Cen 2017 Emerging Infectious Diseases Vol.23 No.5
<P>A reassortant clade 2.3.4.4 avian influenza A(H5N6) virus was isolated from a fecal sample of a Mandarin duck (<I>Aix galericulata</I>) in South Korea during October 2016. This virus was genetically similar to H5N6 subtype virus isolates from China, Vietnam, Laos, and Hong Kong, including human isolates.</P>
Moon, Seok-Jun,Han, Se-Youn,Kim, Dool-Yi,Kim, Beom-Gi,Yoon, In Sun,Shin, Dongjin,Kwon, Hawk-Bin,Byun, Myung-Ok 한국식물학회 2014 Journal of Plant Biology Vol.57 No.3
WRKY transcription factors play a major role in plant biotic and abiotic stress responses. In this study, WRKY transcription factor, CaWRKY1, whose expression was strongly induced by cold and abscisic acid treatment in pepper, was cloned into potato via Agrobacterium-mediated transformation of vector expressing CaWRKY1 under control of the CaMV35S promoter. The overexpression of CaWRKY1 in potato plants increased tolerance to drought stress without noticeably affecting other agricultural important factors, such as plant height, leaf size and tuber formation. In addition, CaWRKY1-overexpressing transgenic potato plants showed increased expression of abiotic stress-related genes, such as C-REPEAT BINDING FACTOR 3 (CBF3), ZINC FINGER PROTEIN ZAT10 (ZAT10), TREHALOSE-6-PHOSPHATE SYNTHASE (TPS) and LATE EMBRYOGENESIS ABUNDANT (LEA). These results suggest that CaWRKY1 can regulate drought stress tolerance in potato plants via the activation of putative stress-responsive genes.