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( Dong Hyun Kim ),( Byung Hee Chun ),( Jae-jung Lee ),( Oh Cheol Kim ),( Jiye Hyun ),( Dong Min Han ),( Che Ok Jeon ),( Sang Hun Lee ),( Sang-han Lee ),( Yong-ho Choi ),( Seung-beom Hong ) 한국미생물생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.3
To investigate the effect of the predominant fungal species from Korean traditional meju and doenjang on soybean fermentation, the enzymatic activity and amino acid production of twenty-two fungal strains were assessed through solid- and liquid-state soybean fermentation. Enzymatic activity analyses of solid-state fermented soybeans revealed different enzyme activities involving protease, leucine aminopeptidase (LAP), carboxypeptidase (CaP), glutaminase, γ-glutamyl transferase (GGT), and amylase, depending on the fungal species. These enzymatic activities significantly affected the amino acid profile throughout liquid-state fermentation. Strains belonging to Mucoromycota, including Lichtheimia, Mucor, Rhizomucor, and Rhizopus, produced smaller amounts of total amino acids and umami-producing amino acids, such as glutamic acid and aspartic acid, than strains belonging to Aspergillus subgenus circumdati. The genera Penicillium and Scopulariopsis produced large amounts of total amino acids and glutamic acid, suggesting that these genera play an essential role in producing umami and kokumi tastes in fermented soybean products. Strains belonging to Aspergillus subgenus circumdati, including A. oryzae, showed the highest amino acid content, including glutamic acid, suggesting the potential benefits of A. oryzae as a starter for soybean fermentation. This study showed the potential of traditional meju strains as starters for soybean fermentation. However, further analysis of processes such as the production of G-peptide for kokumi taste and volatile compounds for flavor and safety is needed.
Kim, Jiye,Lee, So Hee,Kim, Haekyoung,Kim, Se Hyun,Park, Chan Eon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.26
<P>We successfully fabricated high performance bottom-contact organic field-effect transistors (OFETs) using silver nanowire (AgNW) network electrodes by spray deposition. The synthesized AgNWs have the dimensions of 40–80 nm in diameter and 30–80 μm in length and are randomly distributed and interconnected to form a 3D hollow framework. The AgNWs networks, deposited by spray coating, yield an average optical transmittance of up to 88% and a sheet resistance as low as 10 ohm/sq. For using AgNWs as source/drain electrodes of OFETs with a bottom-contact configuration, the large contact resistance at the AgNWs/organic channel remains a critical issue for charge injection. To enhance charge injection, we fabricate semiconductor crystals on the AgNW using an adsorbed residual poly(<I>N</I>-vinylpyrrolidone) layer. The resulting bottom-contact OFETs exhibit high mobility up to 1.02 cm<SUP>2</SUP>/(V s) and are similar to that of the top-contact Au electrodes OFETs with low contact resistance. A morphological study shows that the pentacene crystals coalesced to form continuous morphology on the nanowires and are highly interconnected with those on the channel. These features contribute to efficient charge injection and encourage the improvement of the bottom-contact device performance. Furthermore, the large contact area of individual AgNWs spreading out to the channel at the edge of the electrode also improves device performance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-26/acsami.5b02610/production/images/medium/am-2015-02610b_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b02610'>ACS Electronic Supporting Info</A></P>
Kim, Jiye,Lew, Dae Hyun,Roh, Tai Suk,Lee, Won Jai by Mutaz B. Habal, MD. 2017 JOURNAL OF CRANIOFACIAL SURGERY - Vol.28 No.7
ABSTRACT: The selection of materials for orbital wall reconstruction has been a matter of debate. This study aimed to evaluate the effectiveness of an acellular allogenic dermal matrix (ADM) as an orbital wall reconstruction material and to compare the results of orbital wall reconstruction with the ADM to those of reconstruction with the more widely used absorbable mesh plate and porous polyethylene. We retrospectively reviewed the clinical charts and computed tomography images of 73 patients who underwent orbital reconstruction at 1 institution between March 2013 and February 2014. In the ADM group, the mean defect size of 29 patients was 2.89 cm. After orbital wall reconstruction with ADM, patients with preoperative enophthalmos (7 patients), limited range of eyeball movement (6 patients), and diplopia (12 patients) showed improvements. In the comparative study, the 3 groups showed no significant differences with respect to age distribution (P = 0.522), defect size (P = 0.455), and preoperative findings such as enophthalmos (P = 0.811), diplopia (P = 0.357), and limited range of eyeball movement (P = 0.795). All the preoperative symptoms improved in every group, and in the ADM group, no complication was observed during the postoperative follow-up. ADM is a biocompatible material that combines the flexibility and rigidity required to support the orbital soft tissue. Therefore, it could be an excellent alternative material for orbital wall reconstruction.
Kim, Jiye,Kim, Hyekyoung,Kim, Se Hyun,Park, Chan Eon American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.2
<P>We successfully fabricated highly stable pentacene-based bottom-contact organic field-effect transistors (OFETs) with good charge injection properties at the electrode/organic semiconductor interface, obtained by optimizing the composition of solution-processed (poly(3,4-ethylenedioxythiophene):polystyrene sulfonate):polytetrafluoroethylene ((PEDOT:PSS):PTFE)-treated Au source/drain (S/D) electrodes. The (PEDOT:PSS):PTFE layer was deposited on the Au layer by spin-coating a mixture solution. The work function of the electrode increased from 4.84 to 5.21 eV as the PTFE concentration increased, accompanied by an interface dipole at the electrode surface. The optimized (PEDOT:PSS):PTFE (0.95:0.05)-treated electrodes significantly reduced the charge injection barrier at the electrode/semiconductor interface to achieve efficient charge transfer in the OFETs. Bottom-contact OFETs prepared with the optimized (PEDOT:PSS):PTFE-treated S/D electrodes had a field-effect mobility of 0.16 cm(2)/(V.s), which exceeded that of PEDOT:PSS-treated S/D electrodes (0.073 cm(2)/(V.s)). The operational stability of the optimized device was remarkable under gate-bias stress (V-G = -40 V over 3 h).</P>
Jo, Geunhyeong,Hyun, Jiye,Hwang, Doseok,Lee, Young Han,Koh, Dongsoo,Lim, Yoongho John Wiley Sons, Ltd. 2011 Magnetic resonance in chemistry Vol.49 No.6
<P><B>Abstract</B></P><P>Resveratrol is a polyphenol isolated from many natural sources including grapes, mulberries, eucalyptus, spruce, lilies, and peanuts. The hydroxyl groups in polyphenols can be substituted with various functional groups, allowing production of multiple derivatives. NMR spectroscopy is used to identify new derivatives. Since the complete NMR data of the known derivatives can be useful for identification of the newly isolated derivatives, here, we report the synthesis of 14 methoxylated stilbenes and four 1,2‐diphenylethanes and their NMR data. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Synthesis and complete assignment of NMR data of 20 chalcones
Hwang, Doseok,Hyun, Jiye,Jo, Geunhyeong,Koh, Dongsoo,Lim, Yoongho John Wiley Sons, Ltd. 2011 Magnetic resonance in chemistry Vol.49 No.1
<P><B>Abstract</B></P><P>Chalcones, intermediates in flavonoid biosynthesis, can exhibit antibacterial, antiproliferative, and anti‐inflammatory properties. Chalcones contain two benzene rings and both hydroxylated and methoxylated analogs are frequently produced by hydroxylases and <I>O</I>‐methyltransferases in plant biosynthetic pathways. Assignments of NMR peaks in the spectra of hydroxylated and/or methoxylated chalcones can help in identifying novel chalcone derivatives isolated from natural sources by referencing these data against NMR spectra obtained from known chalcones. We report here the syntheses of 20 chalcones and complete assignments of <SUP>1</SUP>H and <SUP>13</SUP>C NMR spectra. Copyright © 2010 John Wiley & Sons, Ltd.</P>