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Jaekyeong Song,Songwha Kim,Ju Hee An,Mee Kyung Sang,Hang-Yeon Weon 한국미생물학회 2020 미생물학회지 Vol.56 No.4
Peribacillus butanolivorans strain KJ40, a soil bacterium isolated from the rhizosphere soil of pepper, ameliorates drought stress in the host plant. Here, we report the whole genome sequence of strain KJ40. The sequence analysis revealed that strain KJ40 possesses a single 5,451,105 bp circular chromosome with an DNA G + C-content of 38.13%. This chromosome contains 4,945 protein-coding sequences and 39 rRNA and 84 tRNA genes. Thereafter using the sequencing data, the major genes related to stress tolerance and plant growth processes, such as proline and spermidine synthesis, and butanediol production, were identified.
Hydrogen production by steam reforming of ethanol over Ni/Al 2 O 3 -La 2 O 3 xerogel catalysts
Song, Ji Hwan,Yoo, Sangbeom,Yoo, Jaekyeong,Park, Seungwon,Gim, Min Yeong,Kim, Tae Hyeop,Song, In Kyu Elsevier 2017 Molecular catalysis Vol.434 No.-
<P>A series of nickel catalysts supported on binary Al2O3-La2O3 xerogel supports with different La/Al molar ratio were prepared via a sol-gel method and a subsequent wetness impregnation method for use in the ethanol steam reforming reaction. The effect of La/Al molar ratio on the characteristics and catalytic activities of Ni/Al2O3-La2O3 catalysts in the hydrogen production by steam reforming of ethanol was investigated. The prepared Ni/Al2O3-La2O3 catalysts were characterized by nitrogen adsorption desorption, ICP-AES (inductively coupled plasma atomic emission spectroscopy), XRD (X-ray diffraction), Al-27 MAS NMR (magic angle spinning nuclear magnetic resonance), TPR (temperature-programmed reduction), TPO (temperature-programmed oxidation), TEM (transmission electron microscopy), and TPD (temperature-programmed desorption) analyses. Physicochemical properties of the catalysts were suppressed with increasing La/Al molar ratio because of the formation of defective structure within the alumina lattice. Acidity of Ni/Al2O3-La2O3 'catalysts was weakened with increasing La/Al molar ratio, while basicity of the catalysts was strengthened. Nickel dispersion and nickel surface area increased with increasing La/Al molar ratio. On the contrary, ethanol adsorption capacity of the catalysts decreased with increasing La/Al molar ratio due to their unfavorable physicochemical properties. Hydrogen yield showed a volcano-shaped curve with respect to La/Al molar ratio, where an optimal amount of La content was required to achieve the most promising catalytic performance. The enhanced catalytic activity at an intermediate La/Al molar ratio is believed to be due to the offset of two opposite trends between nickel surface area and ethanol adsorption capacity of Ni/Al2O3-La2O3 catalysts. (C) 2017 Elsevier B.V. All rights reserved.</P>
Song, Ji Hwan,Han, Seung Ju,Yoo, Jaekyeong,Park, Seungwon,Kim, Do Heui,Song, In Kyu Elsevier 2016 Journal of molecular catalysis Chemical Vol.415 No.-
<P><B>Abstract</B></P> <P>A series of alkaline earth metal-promoted nickel catalysts supported on Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> (Ni–X/AZ, X=Mg, Ca, Sr, and Ba) were prepared by an epoxide-driven sol-gel method and a subsequent co-impregnation method. For comparison and reference, promoter-free Ni/Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> catalyst (Ni/AZ) was also prepared by an epoxide-driven sol-gel method and a subsequent impregnation method. The effect of alkaline earth metal addition on the physicochemical properties and catalytic activities of Ni–X/Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> catalysts in the steam reforming of ethanol was investigated. The catalysts were characterized by nitrogen adsorption-desorption, ICP-AES, XRD, TPR, TEM, H<SUB>2</SUB>-TPD, NH<SUB>3</SUB>-TPD, and EtOH-TPD analyses. It was revealed that addition of alkaline earth metal promoters reduced acidity of the catalysts and positively influenced catalytic activity in the steam reforming of ethanol. Hydrogen yield increased with the introduction of promoter, which was attributed to enhanced nickel dispersion. Nickel surface area and ethanol adsorption capacity of the catalysts were well correlated with hydrogen yield. Hydrogen yield increased with increasing nickel surface area and with increasing ethanol adsorption capacity of the catalysts. Among the catalysts tested, Ni–Sr/AZ catalyst showed the most promising result. It was concluded that addition of alkaline earth metal promoters increased nickel surface area by acting as a spacer, leading to higher ethanol adsorption capacity and hydrogen yield.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni–X/Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> (AZ) (X=Mg, Ca, Sr, and Ba) catalysts were prepared. </LI> <LI> Hydrogen was produced by steam reforming of ethanol. </LI> <LI> Hydrogen yield increased with increasing ethanol adsorption capacity of the catalysts. </LI> <LI> Hydrogen yield increased with increasing nickel surface area of the catalysts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yoo, Jaekyeong,Park, Seungwon,Song, Ji Hwan,Yoo, Sangbeom,Song, In Kyu Pergamon Press 2017 International journal of hydrogen energy Vol.42 No.47
<P><B>Abstract</B></P> <P>A series of butyric acid (BA)-assisted nickel/alumina catalysts (denoted as XBAN/A) with different butyric acid/Ni molar ratio (X) were prepared by an impregnation method, and they were applied to the hydrogen production by steam reforming of natural gas. All the XBAN/A catalysts exhibited X-ray diffraction patterns indicative of highly stable nickel aluminate phase. However, a XBAN/A catalyst with an appropriate amount of butyric acid showed the enhanced nickel dispersion because of steric hindrance of butyric acid shell surrounding nickel particle. Addition of butyric acid also increased methane adsorption capacity of the catalysts, which was directly related to the catalytic performance. In the steam reforming of natural gas, both natural gas conversion and hydrogen yield showed volcano-shaped trends with respect to butyric acid/Ni molar ratio (X). Nickel dispersion of XBAN/A catalysts was well correlated with natural gas conversion and hydrogen yield over the catalysts. Natural gas conversion and hydrogen yield increased with increasing nickel dispersion. Among the catalysts tested, 0.25BAN/A catalyst with the highest nickel dispersion exhibited the best catalytic performance in the steam reforming of natural gas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A series of butyric acid-assisted Ni/Al<SUB>2</SUB>O<SUB>3</SUB> (XBAN/A) catalysts were prepared. </LI> <LI> Hydrogen was produced by steam reforming of natural gas. </LI> <LI> Hydrogen yield increased with increasing methane adsorption capacity. </LI> <LI> Hydrogen yield increased with increasing nickel dispersion. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yoo, Jaekyeong,Bang, Yongju,Han, Seung Ju,Park, Seungwon,Song, Ji Hwan,Song, In Kyu American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.10
<P>A magnesium-doped nickel-alumina aerogel catalyst (Mg/NAA) was prepared by a single-step epoxide-driven sol-gel method followed by a supercritical CO2 drying. For comparison, a magnesium-doped nickel-alumina xerogel catalyst (Mg/NAX) was prepared by a single-step epoxide-driven sol-gel method without a supercritical CO2 drying. Mg/NAA and Mg/NAX catalysts were applied to the hydrogen production by steam reforming of liquefied natural gas (LNG). In order to investigate the effect of preparation method on catalytic performance, the catalysts were characterized by nitrogen adsorption-desorption, ICP-AES, XRD, TPR, TEM, and hydrogen chemisorption analyses. It was observed that Mg/NAA catalyst showed better textural properties than Mg/NAX catalyst due to suppressed collapse of nickel-alumina gel network during the supercritical CO2 drying step. It was also revealed that Mg/NAA catalyst retained larger nickel surface area, smaller average nickel diameter, and higher nickel dispersion than Mg/NAX catalyst. In the hydrogen production by steam reforming of LNG, Mg/NAA catalyst with the higher nickel dispersion showed the better catalytic performance than Mg/NAX catalyst in terms of hydrogen yield and LNG conversion.</P>
Hyun Gi Kong(Hyun Gi Kong),Mee Kyung Sang(Mee Kyung Sang),Ju Hee An(Ju Hee An),Songhwa Kim(Songhwa Kim),Yong Ju Jin(Yong Ju Jin),Jaekyeong Song(Jaekyeong Song) 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.6
Bacterial wilt caused by Ralstonia solanacearum is considered one of the most harmful diseases of pepper plants. Recently, research on plant disease control through the rhizosphere microbiome has been actively conducted. In this study, the relationship with disease occurrence between the neighboring plant confirmed by analyzing the physicochemical properties of the rhizosphere soil and changes in the microbial community. The results confirmed that the microbial community changes significantly depending on the organic matters, P2O5, and clay in the soil. Despite significant differences in microbial communities according to soil composition, Actinobacteriota at the phylum level was higher in healthy plant rhizosphere (mean of relative abundance, D: 8.05 ± 1.13; H: 10.06 ± 1.59). These results suggest that Actinobacteriota may be associated with bacterial wilt disease. In this study, we present basic information for constructing of healthy soil in the future by presenting the major microbial groups that can suppress bacterial wilt.
Yi, Hana,Song, Jaekyeong,Cho, Jang-Cheon,Chun, Jongsik Society for General Microbiology 2011 International journal of systematic and evolutiona Vol.61 No.10
<P>A strictly aerobic, nitrate-reducing, motile, rod-shaped member of the class Gammaproteobacteria, designated strain JC2671(T), was isolated from a seashore sand sample from Dokdo, Korea. The isolate reduced nitrate to nitrite, but not to nitrogen, and required NaCl for growth. 16S rRNA gene sequence analysis indicated that the isolate belonged to the genus Zobellella within the order Alteromonadales with sequence similarities of 96.0-97.6???% to strains of Zobellella species with validly published names. However, in DNA-DNA hybridization studies, a low genomic relatedness (43???%) between strain JC2671(T) and the type strain of Zobellella denitrificans indicated that the isolate represented a novel genomic species. The polar lipid pattern (phosphatidylethanolamine and phosphatidylglycerol), predominant cellular fatty acids [C(16???:???0), summed feature 3 (C(16???:???1)??6c and/or C(16???:???1)??7c) and summed feature 8 (C(18???:???1)??6c and/or C(18???:???1)??7c)] and the DNA G+C content (59 mol%) of the novel strain were consistent with its assignment to the genus Zobellella. In contrast, a number of phenotypic characteristics, namely a requirement of NaCl for growth, the inability to grow under facultatively anaerobic conditions, the absence of nitrite reduction and differences in carbohydrate utilization and enzymic activities, clearly distinguished the novel isolate from other species of the genus Zobellella. Data from this polyphasic study indicate that strain JC2671(T) represents a novel species in the genus Zobellella, for which the name Zobellella aerophila sp. nov. is proposed. The type strain is JC2671(T) (???=???KACC 15081(T) ???=???JCM 17110(T)). The description of the genus Zobellella has been emended accordingly.</P>