H₂ pressure swing adsorption for high pressure syngas from an integrated gasification combined cycle with a carbon capture process

Moon, D.K.,Lee, D.G.,Lee, C.H. Applied Science Publishers 2016 APPLIED ENERGY Vol.183 No.-

<P>The integrated gasification combined cycle (IGCC) process, possessing high efficiency and environmental advantages, produces H-2-rich syngas at high pressures (30-35 bar) after capturing CO2. Since the syngas pressure is very high for conventional PSA processes, development of an efficient PSA process at the pressure conditions is required for H-2 production. In this study, the H-2 PSA process for IGCC syngas was developed experimentally and theoretically. Breakthrough and PSA experiments using activated carbon or activated carbon/zeolite LiX were performed at 25-35 bar by using a five-component hydrogen mixture (H-2:CO:N-2:CO2:Ar = 88:3:6:2:1 mol%) as a simulated syngas. The overall PSA performance was evaluated in terms of the purity, recovery and productivity of H-2 product. According to the results from using single or layered beds, the two-bed PSA process produced 99.77-99.95% H-2 with 73.30-77.64% recovery experimentally. A four-layered bed PSA at 35 bar was able to produce 99.97%-purity H-2 with 79% recovery, and it contained Ar and N-2 impurities. The quality of tail gas from the PSA process could be used for the gas turbine without losing H-2 and CO. A rigorous mathematical model that included mass, energy, and momentum balances was employed to elucidate the dynamic behaviors and separation performance of the adsorption bed and PSA process. (C) 2016 Elsevier Ltd. All rights reserved.</P>

Effect of acid-pretreatment on hydrogen fermentation of food waste: Microbial community analysis by next generation sequencing

Kim, D.H.,Jang, S.,Yun, Y.M.,Lee, M.K.,Moon, C.,Kang, W.S.,Kwak, S.S.,Kim, M.S. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.29

This work presents the effect of acid-pretreatment on H<SUB>2</SUB> fermentation of food waste with detailed microbial information by next generation sequencing. The pretreated food waste at pH 1.0-4.0 was cultivated under mesophilic conditions without external inoculum addition. From the food waste acid-pretreated at pH 1-3, H<SUB>2</SUB> yields in the range of 1.37-1.74 mol H<SUB>2</SUB>/mol hexose<SUB>added</SUB> were achieved, attaining the highest value at pH 2. Clostridium sp. such as Clostridium acetobutylicum ATCC 824 and Clostridium perfringens occupied more than 70% of total number of sequences at pH 1-3. On the other hand, in the control (no pretreatment) and at pH 4, lactic acid bacteria such as Lactobacillus and Streptococcus were found to be the dominant genus (>90% of total number of sequences), resulting in a low H<SUB>2</SUB> yield. In addition, the effect of substrate concentration on H<SUB>2</SUB> fermentation was investigated, and the maximum H<SUB>2</SUB> productivity was estimated to be 27.2 L H<SUB>2</SUB>/L/d by Andrew's model.

A novel canine influenza H3N2 virus isolated from cats in an animal shelter

Jeoung, H.Y.,Lim, S.I.,Shin, B.H.,Lim, J.A.,Song, J.Y.,Song, D.S.,Kang, B.K.,Moon, H.J.,An, D.J. Elsevier Scientific Pub. Co 2013 Veterinary microbiology Vol.165 No.3

The interspecies transmission of avian-origin H3N2 canine influenza virus (CIV) to dogs was first reported in 2007. The present study characterized a novel CIV H3N2 isolated from cats in an animal shelter. A comparative analysis of the deduced amino acid sequences of the A/Canine/Korea/CY009/2010(H3N2) (CY009) and A/Feline/Korea/FY028/2010 (H3N2) (FY028) strains isolated from dogs and cats, respectively, in the animal shelter identified point mutations in 18 amino acid positions within eight viral genes. Interestingly, CY009 and FY028 replicated well in specific pathogen-free embryonated chicken eggs and in mice, respectively. Mice infected with the FY028 strain exhibited significant over expression of IL-10, TNF-α, and IFN-γ (p<0.001) at 3 days postinfection. Thus, an emergency monitoring system should be developed to identify influenza mutations that occur during interspecies transmission in companion animals and for continuous public health surveillance.

두개골의 단순전후 방사선 사진을 이용한 전두동의 분류 및 그 분포에 관한 연구

이혜경,권귀향,김기정,강신몽,문국진 순천향대학교 2002 Journal of Soonchunhyang Medical Science Vol.8 No.4

IL-32γ inhibits cancer cell growth through inactivation of NF-κB and STAT3 signals

Oh, J H,Cho, M-C,Kim, J-H,Lee, S Y,Kim, H J,Park, E S,Ban, J O,Kang, J-W,Lee, D-H,Shim, J-H,Han, S B,Moon, D C,Park, Y H,Yu, D-Y,Kim, J-M,Kim, S H,Yoon, D-Y,Hong, J T Nature Publishing Group 2011 Oncogene Vol.30 No.30

<P>Several studies have shown physiological functions of interleukin (IL)-32, a novel cytokine. However, the role of IL-32 in cancer development has not been reported. In this study, we showed that IL-32γ inhibited tumor growth in IL-32γ-overexpressing transgenic mice inoculated with melanoma as well as colon tumor growth in xenograft nude mice inoculated with IL-32γ-transfected colon cancer cells (SW620). The inhibitory effect of IL-32γ on tumor growth was associated with the inhibition of constitutive activated nuclear transcription factor-κB (NF-κB) and of signal transducer and activator of transcription 3 (STAT3). The expression of antiapoptotic, cell proliferation and tumor-promoting genes (<I>bcl-2</I>, <I>X-chromosome inhibitor of apoptosis protein</I> (<I>IAP</I>), <I>cellular IAP</I> and <I>cellular FADD-like IL-1β-converting enzyme-inhibitory protein</I>, <I>cyclin D</I>), cyclin-dependent kinase 4, cycolooxygenase-2 and inducible nitric oxide synthase was decreased, whereas the expression of apoptotic target genes (<I>caspase-3</I> and <I>-9</I>, <I>bax</I>) increased. In tumor, spleen and blood, the number of cytotoxic CD8<SUP>+</SUP> T cells and CD57<SUP>+</SUP> natural killer cells and the levels of IL-10 increased, but that of tumor necrosis factor-α (TNF-α), IL-1β and IL-6 decreased. We also found that forced overexpression of IL-32γ inhibited colon cancer cell (SW620 and HCT116) growth accompanied with the inhibition of activated NF-κB and STAT3 <I>in vitro</I>. In addition, when IL-32γ was knocked down by small interfering RNA (siRNA) or neutralized with an anti-IL-32γ antibody, IL-32γ-induced colon cancer cell growth inhibition, the IL-32γ-induced decrease of TNF-α, IL-1 and IL-6 production, and the increase of IL-10 production were abolished. However, siRNA of NF-κB and STAT3 augmented IL-32γ-induced colon cancer cell growth inhibition. These findings indicate significant pathophysiological roles of IL-32γ in cancer development.</P>

Inhibitory effects of sulfur compounds on methane oxidation by a methane-oxidizing consortium

Lee, E.H.,Moon, K.E.,Kim, T.G.,Lee, S.D.,Cho, K.S. Society for Bioscience and Bioengineering, Japan ; 2015 Journal of bioscience and bioengineering Vol.120 No.6

Kinetic and enzymatic inhibition experiments were performed to investigate the effects of methanethiol (MT) and hydrogen sulfide (H<SUB>2</SUB>S) on methane oxidation by a methane-oxidizing consortium. In the coexistence of MT and H<SUB>2</SUB>S, the oxidation of methane was delayed until MT and H<SUB>2</SUB>S were completely degraded. MT and H<SUB>2</SUB>S could be degraded, both with and without methane. The kinetic analysis revealed that the methane-oxidizing consortium showed a maximum methane oxidation rate (V<SUB>max</SUB>) of 3.7 mmol g-dry cell weight (DCW)<SUP>-1</SUP> h<SUP>-1</SUP> and a saturation constant (K<SUB>m</SUB>) of 184.1 μM. MT and H<SUB>2</SUB>S show competitive inhibition on methane oxidation, with inhibition values (K<SUB>i</SUB>) of 1504.8 and 359.8 μM, respectively. MT was primary removed by particulate methane monooxygenases (pMMO) of the consortium, while H<SUB>2</SUB>S was degraded by the other microorganisms or enzymes in the consortium. DNA and mRNA transcript levels of the pmoA gene expressions were decreased to ~10<SUP>6</SUP> and 10<SUP>3</SUP>pmoA gene copy number g-DCW<SUP>-1</SUP> after MT and H<SUB>2</SUB>S degradation, respectively; however, both the amount of the DNA and mRNA transcript recovered their initial levels of ~10<SUP>7</SUP> and 10<SUP>5</SUP>pmoA gene copy number g-DCW<SUP>-1</SUP> after methane oxidation, respectively. The gene expression results indicate that the pmoA gene could be rapidly reproducible after methane oxidation. This study provides comprehensive information of kinetic interactions between methane and sulfur compounds.

Conversion of organic solid waste to hydrogen and methane by two-stage fermentation system with reuse of methane fermenter effluent as diluting water in hydrogen fermentation

Jung, K.W.,Moon, C.,Cho, S.K.,Kim, S.H.,Shin, H.S.,Kim, D.H. Elsevier Applied Science 2013 Bioresource technology Vol.139 No.-

In this study, a two-stage system converting organic solid waste (food waste+sewage sludge) to H<SUB>2</SUB> and CH<SUB>4</SUB> was operated. In the first stage of dark fermentative hydrogen production (DFHP), a recently proposed method that does not require external inoculum, was applied. In the second stage, anaerobic sequencing batch reactor (ASBR) and an up-flow anaerobic sludge blanket reactor (UASBr) were followed to treat H<SUB>2</SUB> fermenter effluent. (H<SUB>2</SUB>+CH<SUB>4</SUB>-ASBR) system showed better performance in terms of total biogas conversion (78.6%), while higher biogas production rate (2.03L H<SUB>2</SUB>/L<SUB>system</SUB>/d, 1.96L CH<SUB>4</SUB>/L<SUB>system</SUB>/d) was achieved in (H<SUB>2</SUB>+CH<SUB>4</SUB>-UASBr) system. To reduce the alkali addition requirement in DFHP process, CH<SUB>4</SUB> fermenter effluent was tested as a diluting water. Both the ASBR and UASBr effluent was effective to keep the pH above 6 without CH<SUB>4</SUB> production. In case of using ASBR effluent, H<SUB>2</SUB> production dropped by 15%, but alkali addition requirement was reduced by 50%.

Guest-driven structural flexibility of 2D coordination polymers: Synthesis, structural characterizations, and gas sorption properties

Hyun, S.m.,Kim, T.K.,Kim, Y.K.,Moon, D.,Moon, H.R. Elsevier 2013 Inorganic chemistry communications Vol.33 No.-

Two coordination polymers, {[(NiL<SUB>allyl</SUB>)<SUB>2</SUB>(BuTC)]@?2DEF@?2H<SUB>2</SUB>O} (1) and {[(NiL<SUB>allyl</SUB>)<SUB>2</SUB>(BuTC)]@?3H<SUB>2</SUB>O} (2), ([NiL<SUB>allyl</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>=[Ni(C<SUB>14</SUB>H<SUB>30</SUB>N<SUB>6</SUB>)](ClO<SUB>4</SUB>)<SUB>2</SUB>, H<SUB>4</SUB>BuTC=1,2,3,4-butanetetracarboxylic acid, DEF=N,N'-diethylformamide), were prepared by the self-assembly of [NiL<SUB>allyl</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB> and H<SUB>4</SUB>BuTC in DEF/H<SUB>2</SUB>O and acetonitrile/H<SUB>2</SUB>O, respectively. Single crystal X-ray diffraction and X-ray powder diffraction (XRPD) results revealed that 1 and 2 have two-dimensional layered structures, and the layers were stacked infinitely. Further, guest molecules were intercalated between the layers. Since both of coordination polymers 1 and 2 were constructed from the same building blocks, the structure of each layer was identical. However, depending on the size and the nature of guest molecules, layer packing and the interlayer distances were different for each coordination polymer. Interestingly, due to the instability of DEF guest molecules intercalated in the coordination polymer 1, these guest molecules could be easily liberated from the host, consequently resulting in the same XRPD pattern as that of 2 with slightly different relative intensities. Dried compounds of 1 and 2 (1' and 2', respectively) also showed the same result as evidenced by the XRPD patterns. The similar but non-identical XRPD patterns were revealed that the dried structure 1' had the same interlayer distance and the same intralayer structure as 2 and 2' did, whereas its layer packing remained the same as that of 1. This subtle structural difference of 1' and 2' resulted in their different CO<SUB>2</SUB> uptake behaviors at 195K.

요소 및 암모니아처리 볏짚과 황산병용처리 볏짚의 사료가치 평가 : Ⅱ . 면양에 의한 요소처리 , 암모니아처리 및 황산병용처리 볏짚의 소화율 , 질소균형 및 기호성

유성오,고영두,문승식,박성진,김재황 ( S . O . Yoo,Y . D . Ko,S . S. Moon,S . J . Park,J . H . Kim )) 한국영양사료학회 1998 韓國營養飼料學會誌 Vol.22 No.1

Vitamin D-binding protein interacts with Aβ and suppresses Aβ-mediated pathology

Moon, M,Song, H,Hong, H J,Nam, D W,Cha, M-Y,Oh, M S,Yu, J,Ryu, H,Mook-Jung, I Macmillan Publishers Limited 2013 CELL DEATH AND DIFFERENTIATION Vol.20 No.4

The level of vitamin D-binding protein (DBP) is increased in the cerebrospinal fluid of patients with Alzheimer’s disease (AD), suggesting a relationship with its pathogenesis. In this study, we investigated whether and how DBP is related to AD using several different approaches. A pull-down assay and a surface plasmon resonance binding assay indicated direct interactions between purified DBP and amyloid beta (Aβ), which was confirmed in the brain of AD patients and transgenic AD model mice by immunoprecipitation assay and immunohistochemical double-staining method. Moreover, atomic force microscopic examination revealed that DBP reduced Aβ aggregation in vitro. DBP also prevented Aβ-mediated death in cultured mouse hippocampal HT22 cell line. Finally, DBP decreased Aβ-induced synaptic loss in the hippocampus and rescued memory deficits in mice after injection of Aβ into the lateral ventricle. These results provide converging evidence that DBP attenuates the harmful effects of Aβ by a direct interaction, and suggest that DBP is a promising therapeutic agent for the treatment of AD.