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Evaluation of Cellulolytic Enzyme Production by Indigenous Fungi in Korea
Lee, Hanbyul,Lee, Young Min,Heo, Young Mok,Lee, Jaejung,Kim, Jae-Jin Korean Society of Environmental Biology 2017 환경생물 : 환경생물학회지 Vol.35 No.4
The aim of this study was to select various fungal strains indigenous to Korea that have the potential to produce cellulases, including filter paper activity (FPase), $endo-{\beta}$-1,4-glucanase (EG), and ${\beta}-glucosidase$ (BGL). Among the 25 species of Ascomycetes and the 32 species of Basidiomycetes tested in this study, the Bjerkandera adusta KUC10565, Heterobasidion orientale KUC10556, Hyphoderma praetermissum KUC10609, and Trichoderma harzianum KUC1716 all exhibited remarkably high FPase activity. In addition, the T. harzianum KUC1716 showed high levels of EG and BGL activity. This strain has been selected for further study because of their enzymatic potential.
Lee, Hanbyul,Lee, Young Min,Heo, Young Mok,Lee, Jaejung,Kim, Jun Seok,Kang, Kyu Young,Kim, Jae-Jin Elsevier 2017 INDUSTRIAL CROPS AND PRODUCTS Vol.109 No.-
<P><B>Abstract</B></P> <P>Agricultural residues are a potentially economical and eco-friendly source for second-generation ethanol production. In the present study, efficient cellulolytic enzyme production was studied using agricultural residues as a carbon source. Four types of agricultural residues were evaluated as carbon sources for <I>Trichoderma harzianum</I> KUC1716. Barley straw was identified as the optimal carbon source for the fungus such that the highest enzyme activity occurred in these cultures compared to cultures that used empty fruit bunches (EFB), miscanthus, or rice straw sources. <I>T. harzianum</I> KUC1716 produced high levels of filter paperase (FPase) and cellobiohydrolase (CBH) under optimized medium conditions when a central composite design and response surface methodology were used. Furthermore, <I>T. harzianum</I> KUC1716 fungal enzymes exhibited a significant hydrolysis yield for various types of agricultural residues compared to a commercial enzyme. Our study demonstrates that utilization of agricultural residues for both enzyme production and enzymatic saccharification will contribute to an increase in economical and eco-friendly production of biofuels and bio-based products.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Barley straw was an effective inducer for cellulolytic enzymes production by <I>Trichoderma hazianum</I>. </LI> <LI> The statistical optimization of medium components enhanced cellulolytic enzymes production. </LI> <LI> The fungal enzymes effectively hydrolyzed various types of agricultural residues. </LI> <LI> The fungal enzymes exhibited a significant hydrolysis yield compared to a commercial enzyme. </LI> </UL> </P>
Lee, Tae Hyun,Do, Kwangseok,Lee, Young Woo,Jeon, Sang Soo,Kim, Chulwoo,Ko, Jaejung,Im, Seung Soon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.40
<P>Poly(3,4-ethylenedioxythiophene) nanofibers (PEDOT-NFs) with 10–50 nm diameters and high electrical conductivity (up to 83 S cm<SUP>−1</SUP>) have been fabricated chemically within micelles composed of sodium dodecyl sulfate (SDS) as nanoreactors. Dimethyl sulfoxide (DMSO, 5 wt%) was added to a methanol-based colloidal dispersion containing PEDOT-NFs to improve dispersibility. The dye-sensitized solar cells (DSSCs) using PEDOT-NFs as a counter electrode (CE) with low surface resistance and a highly porous surface exhibited enhanced power conversion efficiency (9.2%) compared to bulk PEDOT (6.8%). To date, PEDOT-NFs have shown the highest performance among CEs using PEDOT. It also surpassed the efficiency of platinum (Pt) CEs (8.6%). Electrochemical characterization, such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), showed that PEDOT-NFs efficiently reduced triiodide due to the enhanced electrical and morphological properties, which contributed to the high current density (17.5 mA cm<SUP>−2</SUP>) and fill factor (72.6%).</P> <P>Graphic Abstract</P><P>Dye-sensitized solar cells (DSSCs) using poly(3,4-ethylenedioxythiophene) nanofibers as counter electrodes showed enhanced overall power conversion efficiency (9.2%) compared to conventional platinum-based DSSCs (8.6%). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34807a'> </P>
Bonding and Electronic Consideration in the Metal-Metal Bonded Edge Sharing Complexes
Jaejung Ko,Kuk-Tae Park,Ikchoon Lee,LEe Bon-Su Korean Chemical Society 1989 Bulletin of the Korean Chemical Society Vol.10 No.6
The molecular interaction of $W_2(NH_2)_4Cl_4$ fragment with chlorine ligands has been studied by means of extended Huckel calculations. We have extended the Huckel calculation to unknown edge-sharing $W_2(NH_2)_4Cl_4({\eta}-X)_2$ complexes (X = CO, H) in order to compare the stability of the complexes. The calculations showed that the size and electronic property of bridged ligand are important in determining the stability. The stabilities of the related metal-metal bonded edge-sharing complexes are discussed.
Lee, Jong-Dae,Kim, Tae-Jin,Han, Won-Sik,Han, Su Jung,Lee, Chongmok,Ko, Jaejung,Kang, Sang Ook WILEY-VCH Verlag 2009 Zeitschrift für anorganische und allgemeine Chemie Vol.635 No.9
<P>A series of group 4 metal complexes containing [6-isopropyl-3-methyl-2-(4-R-4,5-dihydrooxazol-2-yl)phenol] ligands, N,O-(Oz<SUP>R</SUP>–O<SUP>Ph</SUP>) [Oz<SUP>R</SUP> = oxazolyl; R = iPr (4), tBu (5); O<SUP>Ph</SUP> = phenolate] was prepared. The reaction of the lithium salts of compounds 4 and 5 with MCl<SUB>4</SUB>, (M = Ti, Zr, Hf) in 2:1 ratio afforded the corresponding hexacoordinate metal complexes of the types [{N,O-(Oz<SUP>i</SUP><SUP>Pr</SUP>–O<SUP>Ph</SUP>)}<SUB>2</SUB>MCl<SUB>2</SUB>] [M = Ti (6), Zr (7), Hf (8)] and [{N,O-(Oz<SUP>t</SUP><SUP>Bu</SUP>–O<SUP>Ph</SUP>)}<SUB>2</SUB>MCl<SUB>2</SUB>] [M = Ti (9), Zr (10), Hf (11)], respectively. The molecular structures of 6, 7, and 8 were established by X-ray structural studies. The structures showed a helical screw-shaped molecular entity with two alternating N,O-chelating ancillary ligands and two cis-chlorido ligands at the metal centers. In the case of compound 6, chiral locking by two N,O-chelating ligands at the titanium resulted in unusual air stability. The cyclic voltammogram showed electrochemically quasireversible reduction for compound 6, whereby the half-life of the reduction state was about 3 s.</P>
Lee, Youngseok,Lee, Yong,Lee, Jaejung,Bang, Sunhoe,Hyun, Seogang,Kang, Jongkyun,Hong, Sung-Tae,Bae, Eunkyung,Kaang, Bong-Kiun,Kim, Jaeseob Nature Pub. Co 2005 Nature genetics Vol.37 No.3
Several transient receptor potential channels were recently found to be activated by temperature stimuli in vitro. Their physiological and behavioral roles are largely unknown. From a temperature-preference behavior screen of 27,000 Drosophila melanogaster P-insertion mutants, we isolated a gene, named pyrexia (pyx), encoding a new transient receptor potential channel. Pyx was opened by temperatures above 40 °C in Xenopus laevis oocytes and HEK293T cells. It was ubiquitously expressed along the dendrites of a subset of peripheral nervous system neurons and was more permeable to K<SUP>+</SUP> than to Na<SUP>+</SUP>. Although some pyx alleles resulted in abnormal temperature preferences, pyx null flies did not have significantly different temperature preferences than wild-type flies. But 60% of pyx null flies were paralyzed within 3 min of exposure to 40 °C, whereas only 9% of wild-type flies were paralyzed by the same stimulus. From these findings, we propose that the primary in vivo role of Pyx is to protect flies from high-temperature stress.
The antioxidant properties of solid-culture extracts of basidiomycetous fungi.
Lee, Jaejung,Hong, Joo-Hyun,Kim, Jeong-Do,Ahn, Byoung Jun,Kim, Beom Seok,Kim, Gyu-Hyeok,Kim, Jae-Jin Institute of Applied Microbiology, University of T 2013 The Journal of general and applied microbiology Vol.59 No.4
<P>Current studies of the antioxidant activity of fungal resources are mainly focused on the fruiting bodies of edible mushrooms. To access the potential of basidiomycetes in culture-state applications, extracts of solid cultures of 83 basidiomycetous fungi newly isolated from woody materials were prepared at the same concentration (10 mg/ml), and their antioxidant activities were measured using ABTS (2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid) and DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging assays. Among the basidiomycetes tested, Cryptoporus volvatus, Daedalea dickinsii, Gloeophyllum abietinum, G. trabeum, Pseudomerulius curtisii and Stereum hirsutum exhibited good antioxidant activities. The EC50 value for the removal of free radicals was lowest (i.e., most effective) in the crude extract of S. sanguinolentum (19.61 g/ml), and reduced DNA damage based on a DNA nicking assay was observed for the extracts from the six basidiomycetous species above.</P>