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        • Effect of potassium addition on bimetallic PtSn supported θ-Al<sub>2</sub>O<sub>3</sub> catalyst for n-butane dehydrogenation to olefins

          Nagaraja, B.M.,Jung, H.,Yang, D.R.,Jung, K.D. Elsevier Science Publishers 2014 CATALYSIS TODAY - Vol.232 No.-

          PtSn/θ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823K, an atmospheric pressure and a GHSV of 18,000mL(g<SUB>cat</SUB>h)<SUP>-1</SUP>. The compositions listed in order of n-C<SUB>4</SUB><SUP>=</SUP> yields at 823K were as follows: K<SUB>0.95</SUB>(PtSn)<SUB>1.5</SUB>>(PtSn)<SUB>1.5</SUB>>K<SUB>0.4</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>0.7</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>1.2</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>1.45</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>0.9</SUB>(Pt)<SUB>1.5</SUB>. The K<SUB>0.9</SUB>(Pt)<SUB>1.5</SUB> and K<SUB>0.95</SUB>(Sn)<SUB>1.5</SUB> catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)<SUB>1.5</SUB> (without K) catalyst showed the highest n-butane conversion, while K<SUB>0.95</SUB>(PtSn)<SUB>1.5</SUB> did the highest n-C<SUB>4</SUB><SUP>=</SUP> yield. The small amount of potassium on bimetallic PtSn/θ-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst improved n-C<SUB>4</SUB><SUP>=</SUP> selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C<SUB>4</SUB><SUP>=</SUP> yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45wt.%) doped (PtSn)<SUB>1.5</SUB> catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C<SUB>4</SUB><SUP>=</SUP> selectivity of the (PtSn)<SUB>1.5</SUB> catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C<SUB>4</SUB><SUP>=</SUP> selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C<SUB>4</SUB><SUP>=</SUP> yield among the other alkali metals for n-butane dehydrogenation.

        • ASK1/JNK-mediated TAp63 activation controls the cell survival signal of baicalein-treated EBV-transformed B cells

          Park, G. B.,Kim, Y. S.,Lee, H. K.,Yang, J. W.,Kim, D.,Hur, D. Y. Springer Science + Business Media 2016 MOLECULAR AND CELLULAR BIOCHEMISTRY - Vol.412 No.1

          <P>Transcriptionally active p63 (TAp63) promotes cell cycle arrest, senescence, and apoptosis in several cancer cells. Migration inhibitory factor (MIF)/CD74 regulates B-cell survival through nuclear factor (NF)-kappa B-dependent TAp63 expression. In this study, we investigated how the level of TAp63 expression influences the induction of apoptosis in baicalein-treated EBV-transformed B cells. Baicalein induced the expression of TAp63 and apoptosis signal-regulating kinase 1 (ASK1), as well as cytotoxicity, by disrupting the mitochondrial membrane and inhibiting the activation of phosphoinositide 3-kinase (PI3K)/Akt and NF-kappa B. Genetic knockdown of TAp63 or ASK1 by small interfering RNA resulted in protection from apoptosis accompanied by the recovery of CD74, CD44, alpha 4 integrin, Bcl-2, and NF-kappa B activation. Baicalein-induced reactive oxygen species activated the ASK1/JNK pathway with subsequent expression of TAp63. Pre-engagement with MIF/CD74 maintained the expression of CD74, CD44, and alpha 4 integrin, as well as Syk/Src-mediated PI3K/Akt activation, in baicalein-treated EBV-transformed B cells. Meanwhile, ASK1/JNK-dependent TAp63 expression was efficiently suppressed after pre-treatment with MIF. Our results suggest that baicalein-mediated ASK1/JNK activation regulates the mitochondria-dependent apoptosis pathway through the up-regulation of TAp63 and downregulation of NF-kappa B and CD74/CD44 in B-cell malignancies.</P>

        • 비육돈에 미생물제제 급여시 분뇨 특성에 미치는 효과

          곽정훈,최동윤,박치호,김재환,정광화,양창범,유용희,천현식,라창식,Kwag, J.H.,Choi, D.Y.,Park, Ch.H.,Kim, J.H.,Jeong, K.H.,Yang, Ch.B.,Yoo, Y.H.,Chen, H.S.,La, C.S. 한국축산환경학회 2007 축산시설환경학회지 Vol.13 No.3

          본시험은 비육돈사료에 미생물제제를 사료에 미생물제제 A 및 B 0.1 미생물제제 C를 0.2% 혼합 급여할 경우 사료섭취량 및 돈분의 오염물질 배설농도에 미치는 영향을 분석하기 위하여 4처리$\times$반복당 5두로서 총 20두를 공시하여 실시하였는데 그 결과를 요약하면 다음과 같다. 1. 비육돈의 일일 평균사료섭취량은 대조구 3.15 kg/일.두였고 미생물A, B, C구는 각각 3.14kg/일/두, 3.31, 3.42로 미생물제제 C구에서 일일 사료섭취량이 가장 높게 조사되었으며(p<0.05), 2. 일일평균 음수량은 사료섭취량이 높았던 미생물 C구에서 3.95kg/일/두로 가장 높게 조사되었다(p<0.05). 3. 미생물제제 처리구별로 분뇨배설량은 사료섭취량이 높았던 미생물제제 C구에서 가장 많이 배설되는 것으로 조사되었으며(p<0.05), 돈뇨의 배설량도 미생물제제 C구에서 2.23kg/일/두에서 높았다(p<0.05). 4. 돈분뇨의 수분 함량은 및 비료성분인 T-N, $P_{2}O_{5}$, $K_{2}O$ 성분도 처리 간에 큰 차이를 보이지 않았다(p<0.05). 5. 돈분뇨의 평균 BOD 농도는 돈분의 경우 미생물제제 B, C제제 급여구가 유의적으로 높게 조사되었다(p<0.05). 그리고 돈뇨의 BOD의 경우에는 대조구에서 $8,657.5mg/{\ell}$로 가장 높은 것으로 조사되었다(p<0.05). 6. COD 농도는 대조구에서 가장 높게 조사되었으며(p<0.05). 돈뇨의 경우에는 미생물제제 A급여구에서 평균 $9,545mg/{\ell}$로 가장 높았다(p<0.05). 7. SS 농도는 미생물제제 B급여구에서 가장 높게 조사되었으며(p<0.05), 돈분뇨중의 T-N 농도는 처리구간에 유의적인 차이가 나타나지 않았다(p<0.05). 그리고 T-P 농도의 경우에는 미생물제제 C급여구에서 유의적인 차이가 나는 것으로 조사되었다(p<0.05). 이상의 결과를 요약해보면 비육돈에 미생물제제 혼합급여시 사료섭취량과 음수량을 증가시키는데 효과가 있는 것으로 조사되었으나, 비료성분 배설량에는 큰 차이를 보이지 않는 것으로 조사되었으나, BOD 등 오염물질농도의 경우에는 미생물제제 A급여구에서 가장 낮게 조사되어 비육돈사료에 미생물제제 급여시 오염물질 저감효과가 있는 것으로 조사되었다. Study for the effect of three different microbial feed additives(henceforth MA-A, MA-B, and MA-C) on feed coversion rate, and physical and chemical characteristics of swine finisher was conducted. MA-B had higher number of Lactobacillus spp. and yeast, compared to any other. The amylase activity of MA-B was also higher than any other. The daily feed intake rates of pigs fed control, MA-A, MA-B and MA-C were 3.15, 3.14, 3.31 and 3.42 kg, respectively. MA-C had the highest weight gain. However, there was no significant difference between treatments. The weights of feces daily excreted by pigs fed control, MA-A, MA-B, and MA-C were 2.14, 2.02, 2.18, and 2.23 kg/day, respectively. The volume of urine daily excreted by pigs fed control, MA-A, MA-B, and MA-C were 3.14, 3.26, 3.27, and $3.41\;{\ell}/day$, respectively. Water content, T-N, $P_{2}O_{5}$, and $K_{2}O$ in swine manure were not significantly different between treatments. The BOD were between 42,576 and $67,450\;mg/{\ell}$ for feces and were between 5,882.5 and $8,657.5\;mg/{\ell}$ for urine, respectively. The SS were between 138,000 and $180,000\;mg/{\ell}$ for feces and were between 875.0 and $1450.0mg/{\ell}$ for urine, respectively.

        • 육성돈에 미생물제제 급여시 분뇨 특성에 미치는 효과 연구

          곽정훈,최동윤,박치호,김재환,정광화,양창범,유용희,라창식,Kwag, J.H.,Choi, D.Y.,Park, Ch.H.,Kim, J.H.,Jeong, K.H.,Yang, Ch.B.,Yoo, Y.H.,La, C.S. 한국축산환경학회 2007 축산시설환경학회지 Vol.13 No.1

          본 시험은 육성돈 사료에 미생물제제를 사료에 미생물제제 A 및 B 0.1 미생물제제 C를 0.2% 혼합 급여할 경우 사료섭취량 및 돈분의 오염물질 배설농도에 미치는 영향을 분석하기 위하여 4처리$\times$반복당 5두로서 총 20두를 공시하여 실시하였는데 그 결과를 요약하면 다음과 같다. 1. 육성비육돈의 일일 평균사료섭취량은 대조구 2.06kg/일.두였고 미생물 A, B, C 구는 각각 2.13kg/일.두, 2.17, 2.34로 미생물제제 C구에서 일일 사료섭취량이 가장 높게 조사되었으며(p<0.05), 2. 일일평균 음수량은 사료섭취량이 높았던 미생물 C구에서 2.89kg/일/두로 가장 높게 조사되었다(p<0.05). 3. 미생물제제 처리구별로 분뇨 배설량은 사료섭취량이 높았던 미생물제제 C 구에서 가장 많이 배설되는 것으로 조사되었으며 (0<0.05), 돈뇨의 배설량도 미생물제제 C구에서 2.31kg/일/두에서 높았다(p<0.05). 4. 육성돈의 성장단계별 돈분뇨의 수분 함량은 및 비료성분인 T-N, $P_2O_5,\;K_2O$ 성분도 처리간에 큰 차이를 보이지 않았다(p<0.05). 5. 육성돈 분뇨의 평균 BOD 농도는 돈분의 경우 미생물제제 A, B제제 급여구가 유의적으로 높게 조사되었다(p<0.05). 그리고 돈뇨의 BOD의 경우에도 미생물제제 A급 여구에서 $6,537mg/\ell$로 가장 높은 것으로 조사되었다(p<0.05). 6. COD의 경우에도 미생물 C급여구에서 가장 높게 조사되었으며(p<0.05). 돈뇨의 경우에는 미생물제제 A급여구에서 평균 $8,566mg\ell$로 가장 높았다(p<0.05). 7. SS 농도는 대조구에서 가장 높게 조사 되었으며(p<0.05), 그 다음이 미생물 B> 미생물 C> 대조구 순으로 조사되었다. 8. 돈분뇨중의 T-N 농도는 처리구간에 유의적인 차이가 나타나지 않았다(p<0.05). 9. 돈분중의 T-P 농도는 미생물제제 처리 구간별로 미생물제제 A, C 급여구에서 유의적인 차이가 나는 것으로 조사되었다(p<0.05). 이상의 결과를 요약해보면 육성돈에 미생물제제 혼합급여는 사료섭취량을 증가시키는데 효과가 있으나 비료성분 배설량에는 큰 차이를 보이지 않는 것으로 조사되었으며, 오염물질 배설량의 경우에는 사료섭취량이 높은 미생물제제 C 급여구에서 높은 것으로 조사되었다. The effects of microbial feedstuff additives on feed conversion rate and physical and chemical characteristics of excreta in growing pigs were investigated. Three different products (A, B and C) were compared. Microbial population tests showed B contained higher numbers of total bacteria, Lactobacillus spp. and yeasts. The amylase activity of B was also higher than that of A and C. The daily feed intake rates fer control, A, B and C were 2.06, 2.13, 2.17 and 2.34 kg, respectively. Pigs feed product C had the highest liveweight gain(2.89 kg). However, the results of feed conversion rate were not significantly different between treatments. Amount of faces excreted for control, A, B and C was 1.18, 1,19, 1.23 and 1.32 kg, respectively. Urine volume for control, A, B, and C was 1.91, 1.80, 2.19 and 2.31 kg respectively. Moisture content, T-N, $P_2O_5$ and $K_2O$ in pig manure were not significantly different between treatments. The range of BOD values was 63,453 to $73,758mg/\ell$ for faeces, and 5,678 to $7,428mg/\ell$, for urine. SS values of solid and liquid excreta ranged from 142,200 to 176,000 and from 710 to $1,025mg/\ell$, respectively.

        • SCIESCOPUS

          Effects of scoparone on dopamine release in PC12 cells

          Yang, Y.J.,Lee, H.J.,Lee, B.K.,Lim, S.C.,Lee, C.K.,Lee, M.K. Inverni Della Beffa S.p.A ; Elsevier Science 2010 FITOTERAPIA -MILANO- Vol.81 No.6

          The effects of scoparone on dopamine release in PC12 cells were investigated. Scoparone at 50-200@?M increased dopamine release into the culture medium. However, the released levels of dopamine by scoparone were not altered in the absence of extracellular Ca<SUP>2+</SUP> and by adenylyl cyclase inhibitor MDL-12,330A. Scoparone increased phosphorylation of PKA, CaMK II and synapsin I. Scoparone also enhanced K<SUP>+</SUP>-induced levels of dopamine release by CaMK II phosphorylation. These results suggest that scoparone increases dopamine release by synapsin I phosphorylation via activation of PKA and CaMK II, which are mediated by cyclic AMP levels and Ca<SUP>2+</SUP> influx.

        • SCISCIESCOPUS

          Effect of added nickel nitrate on the physical, thermal and morphological characteristics of polyacrylonitrile-based carbon nanofibers

          Nataraj, S.K.,Kim, B.H.,Yun, J.H.,Lee, D.H.,Aminabhavi, T.M.,Yang, K.S. Elsevier 2009 Materials science and engineering B. Advanced Func Vol.162 No.2

          <P><B>Abstract</B></P><P>Porous carbon nanofibers (CNFs) with enhanced physical, thermal and morphological properties are desirable in many areas like catalyst support in fuel cells and supercapacitors as electrode material. This research addresses the effect of added nickel nitrate in 1, 3 and 5wt% into polyacrylonitrile (PAN) precursor solution to produce CNF webs using electrospinning method. Based on the quantitative data obtained from field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) images, we can notice that CNFs were formed with diameters in the size range of 100–300nm after carbonization at 1000°C. Fiber diameter of the random CNFs was decreased by increasing the nickel nitrate contents along with dramatic improvements in porosity and specific surface areas. This study indicated that the optimal nickel nitrate concentration of 5wt% has produced CNFs with enhanced physical and thermo-chemical properties. The high resolution X-ray diffraction (HR-XRD) showed an increase in intensity of 002 peak of the CNFs due to the catalytic function of nickel oxide in the carbonized web and these observations are in agreement with the thermal gravimetric data.</P>

        • Compositional homogeneity and X-ray topographic analyses of CdTe<sub> <i>x</i> </sub>Se<sub>1−<i>x</i> </sub> grown by the vertical Bridgman technique

          Roy, U.N.,Bolotnikov, A.E.,Camarda, G.S.,Cui, Y.,Hossain, A.,Lee, K.,Lee, W.,Tappero, R.,Yang, Ge,Cui, Y.,Burger, A.,James, R.B. Elsevier 2015 Journal of crystal growth Vol.411 No.-

          <P><B>Abstract</B></P> <P>We grew CdTe<SUB> <I>x</I> </SUB>Se<SUB>1−<I>x</I> </SUB> crystals with nominal Se concentrations of 5%, 7%, and 10% by the vertical Bridgman technique, and evaluated their compositional homogeneity and structural quality at the NSLS’ X-ray fluorescence and white beam X-ray topography beam lines. Both X-ray fluorescence and photoluminescence mapping revealed very high compositional homogeneity of the CdTe<SUB> <I>x</I> </SUB>Se<SUB>1−<I>x</I> </SUB> crystals. We noted that those crystals with higher concentrations of Se were more prone to twinning than those with a lower content. The crystals were fairly free from strains and contained low concentrations of sub-grain boundaries and their networks.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdTeSe crystals were grown by the vertical Bridgman technique. </LI> <LI> Very high compositional homogeneity. </LI> <LI> Low concentration of sub-grain boundaries. </LI> <LI> Almost free from sub-grain boundary network. </LI> </UL> </P>

        • KCI등재SCIESCOPUS

          The effects of the phase structure of the polymorphic phase boundary on the piezoelectric properties of (K,Na)NbO<sub>3</sub>-based ceramics

          Yang, S.A.,Kim, B.H.,Lee, M.K.,Bu, S.D.,Lee, G.J. Elsevier 2016 CURRENT APPLIED PHYSICS Vol.16 No.5

          <P>We report the effects of the phase, i.e., the rhombohedral (R), orthorhombic (O) and tetragonal (T) phase, within a polymorphic phase boundary on the piezoelectric properties of (K,Na)NbO3 ceramics doped with Bi(Na,K,Li)ZrO3 and (Bi,Na)TiO3. For the R-O-T phase boundary, the formation of an R-T phase boundary by O phase shrinkage is clearly beneficial to enhance the piezoelectric performance, whereas the enrichment of the T phase in the R-T phase boundary negatively affects the piezoelectric activity. Electrical poling in relation to the piezoelectric property strongly depends on the nature of the phase boundary, requiring the optimization of temperatures corresponding to the R-T phase boundary without the O phase. (C) 2016 Elsevier B.V. All rights reserved.</P>

        • Forebrain-specific ablation of phospholipase Cγ1 causes manic-like behavior

          Yang, Y R,Jung, J H,Kim, S-J,Hamada, K,Suzuki, A,Kim, H J,Lee, J H,Kwon, O-B,Lee, Y K,Kim, J,Kim, E-K,Jang, H-J,Kang, D-S,Choi, J-S,Lee, C J,Marshall, J,Koh, H-Y,Kim, C-J,Seok, H,Kim, S H,Choi, J H,Ch Macmillan Publishers Limited, part of Springer Nat 2017 Molecular psychiatry Vol.22 No.10

          <P>Manic episodes are one of the major diagnostic symptoms in a spectrum of neuropsychiatric disorders that include schizophrenia, obsessive-compulsive disorder and bipolar disorder (BD). Despite a possible association between BD and the gene encoding phospholipase C gamma 1 (PLCG1), its etiological basis remains unclear. Here, we report that mice lacking phospholipase C gamma 1 (PLC gamma 1) in the forebrain (Plcg1(f/f); CaMKII) exhibit hyperactivity, decreased anxiety-like behavior, reduced depressive-related behavior, hyperhedonia, hyperphagia, impaired learning and memory and exaggerated startle responses. Inhibitory transmission in hippocampal pyramidal neurons and striatal dopamine receptor D1-expressing neurons of Plcg1-deficient mice was significantly reduced. The decrease in inhibitory transmission is likely due to a reduced number of gamma-aminobutyric acid (GABA)-ergic boutons, which may result from impaired localization and/or stabilization of postsynaptic CaMKII (Ca2+/calmodulin-dependent protein kinase II) at inhibitory synapses. Moreover, mutant mice display impaired brain-derived neurotrophic factor-tropomyosin receptor kinase B-dependent synaptic plasticity in the hippocampus, which could account for deficits of spatial memory. Lithium and valproate, the drugs presently used to treat mania associated with BD, rescued the hyperactive phenotypes of Plcg1(f/f); CaMKII mice. These findings provide evidence that PLC gamma 1 is critical for synaptic function and plasticity and that the loss of PLC gamma 1 from the forebrain results in manic-like behavior.</P>

        • CHF enhancement by vessel coating for external reactor vessel cooling

          Yang, J.,Dizon, M.B.,Cheung, F.B.,Rempe, J.L.,Suh, K.Y.,Kim, S.B. Elsevier 2006 Nuclear engineering and design Vol.236 No.10

          <P><B>Abstract</B></P><P>In-vessel retention (IVR) is a key severe accident management (SAM) strategy that has been adopted by some operating nuclear power plants and proposed for some advanced light water reactors (ALWRs). One viable means for IVR is the method of external reactor vessel cooling (ERVC) by flooding the reactor cavity during a severe accident. As part of a joint Korean–United States International Nuclear Energy Research Initiative (K-INERI), an experimental study has been conducted to investigate the viability of using an appropriate vessel coating to enhance the critical heat flux (CHF) limits during ERVC. Toward this end, transient quenching and steady-state boiling experiments were performed in the subscale boundary layer boiling (SBLB) facility at the Pennsylvania State University using test vessels with micro-porous aluminum coatings. Local boiling curves and CHF limits were obtained in these experiments. When compared to the corresponding data without coatings, substantial enhancement in the local CHF limits for the case with surface coatings was observed. Results of the steady-state boiling experiments showed that micro-porous aluminum coatings were very durable. Even after many cycles of steady-state boiling, the vessel coatings remained rather intact, with no apparent changes in color or structure. Moreover, the heat transfer performance of the coatings was found to be highly desirable with an appreciable CHF enhancement in all locations on the vessel outer surface but with very little effect of aging.</P>

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