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Bum-Kyum Kim,Donggu Im,Jaeyoung Choi,Kwyro Lee IEEE 2014 IEEE journal of solid-state circuits Vol.49 No.6
<P>A highly linear LNA is implemented in a 0.18 μm SOI CMOS process for 1 GHz SAW-less receiver applications. To achieve lower noise figure (NF) than conventional simultaneous noise and input matching methods, a capacitive loading based simultaneous noise and input matching technique reducing the NF degradation coming from a lossy gate inductor has been devised. In addition, in order to improve both the 1 dB gain compression point (CP1dB) and the third-order intercept point (IP3) without sacrificing NF, a large-signal transconductance linearization method adopting body-bias control and complementary-superposition is proposed. The proposed LNA shows a measured input-referred CP1dB of 3 dBm, 1 dB desensitization point (B1dB) of 0 dBm and IB (in-band)-IIP3 of 22 dBm with gain of 10.7 dB and NF of 1.3 dB at 1 GHz while driving a 50 Ω load impedance. It draws 20 mA with a buffer stage from a 2.5 V supply voltage.</P>
Kim, Yong-Seok,Yi, Hana,Kim, Myung Kyum,Seong, Chi-Nam,Kim, Wonyong,Jeon, Che Ok,Kim, Seung-Bum,Im, Wan-Taek,Joh, Kiseong,Cha, Chang-Jun The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4
In the project of a comprehensive investigation of indigenous prokaryotic species in Korea, a total of 39 bacterial strains phylogenetically belonging to the classes Betaproteobacteria and Gammaproteobacteria were isolated from various environmental sources such as soil, cultivated soil, sludge, seawater, marine sediment, algae, human, tree, moss, tidal flat, beach sand and lagoon. Phylogenetic analysis based on 16S rRNA gene sequences revealed that 39 strains showed the high sequence similarities (≥98.7%) to the closest type strains and formed robust phylogenetic clades with closely related species in the classes Betaproteobacteria and Gammaproteobacteria. In the present study, we report 14 species of 9 genera of four families of two orders in the class Betaproteobacteria and 25 species of 21 genera of 15 families of eight orders in the class Gammaproteobacteria, which have not been reported in Korea. Morphological, biochemical, and physiological characteristics, isolation sources, and NIBR deposit numbers are described in the species descriptions.
Description of unrecorded bacterial species belonging to the phylum Actinobacteria in Korea
Kim, Mi-Sun,Kim, Seung-Bum,Cha, Chang-Jun,Im, Wan-Taek,Kim, Won-Yong,Kim, Myung-Kyum,Jeon, Che-Ok,Yi, Hana,Yoon, Jung-Hoon,Kim, Hyung-Rak,Seong, Chi-Nam The National Institute of Biological Resources 2021 Journal of species research Vol.10 No.1
For the collection of indigenous prokaryotic species in Korea, 77 strains within the phylum Actinobacteria were isolated from various environmental samples, fermented foods, animals and clinical specimens in 2019. Each strain showed high 16S rRNA gene sequence similarity (>98.8%) and formed a robust phylogenetic clade with actinobacterial species that were already defined and validated with nomenclature. There is no official description of these 77 bacterial species in Korea. The isolates were assigned to 77 species, 31 genera, 18 families, 14 orders and 2 classes of the phylum Actinobacteria. All the strains except one Coriobacteriia strain were affiliated within the class Actinomycetia. Among them, the orders Streptomycetales and Microbacteriales were predominant. A number of strains were isolated from forest soils, riverside soils, and ginseng cultivated soils. Twenty-nine strains were isolated from 'Protected Ecosystem and Scenery Areas'. Morphological properties, basic biochemical characteristics, isolation source and strain IDs are described in the species descriptions.
Kurthia ruminicola sp. nov., isolated from the rumen contents of a Holstein cow
Kim, Myung Kyum,Kim, Eun Tae,Kim, Sang Bum,Jeong, Ha Yeon,Park, Beom Young,Srinivasan, Sathiyaraj MICROBIOLOGICAL SOCIETY OF KOREA 2018 JOURNAL OF MICROBIOLOGY -SEOUL- Vol.56 No.1
Gram-staining-positive, motile, rod-shaped bacteria, designated as <TEX>$H31022^T$</TEX> and H31024 was isolated from rumen contents of a Holstein cow. Optimum growth occurred at <TEX>$25^{\circ}C$</TEX> and pH 7.0 on R2A agar medium. Oxidase and catalase activities are positive. The 16S rRNA gene sequence (1,452 bp) of the new isolates revealed they belong to the genus Kurthia of the phylum Firmicutes. Highest gene sequence similarities were assessed to be with Kurthia massiliensis <TEX>$JC30^T$</TEX> (98.4%), Kurthia senegalensis <TEX>$JC8E^T$</TEX> (97.5%), and Kurthia populi <TEX>$10y-14^T$</TEX> (97.4%). Kurthia sibirica DSM <TEX>$4747^T$</TEX> (97.3%), Kurthia zopfii NBRC <TEX>$101529^T$</TEX> (97.0%), and Kurthia gibsonii NCIMB <TEX>$9758^T$</TEX> (96.7%). DNA G + C content of strains <TEX>$H31022^T$</TEX> and H31024 were 34.4% and 39.7%. Strains <TEX>$H31022^T$</TEX> and H31024 has the following chemotaxonomic characteristics; the major fatty acids are <TEX>$iso-C_{15:0}$</TEX>, <TEX>$iso-C_{14:0}$</TEX> and <TEX>$anteiso-C_{15}$</TEX>; polar lipid profile contained diphosphatidylglycerol (DPG), phosphatidylethanolamine (PE), unknown aminophospholipids (APL), unknown glycolipids (GL), unknown phospholipids (PL), and unknown polar lipids (L); the major quinone is MK-7. Based on polyphasic taxonomic analysis, strains <TEX>$H31022^T$</TEX> (<TEX>$=KCTC\;33923^T=JCM\;19640^T$</TEX>) and H31024 (<TEX>$=KCTC\;33924^T=JCM\;19641^T$</TEX>) identified a novel species in the genus Kurthia for which the name Kurthia ruminicola sp. nov. is proposed.
Unrecorded prokaryotic species belonging to the class Actinobacteria in Korea
Kim, Mi-Sun,Jeong, Seong-Hwa,Kang, Joo-Won,Kim, Seung-Bum,Cho, Jang-Cheon,Cha, Chang-Jun,Im, Wan-Taek,Bae, Jin-Woo,Lee, Soon-Dong,Kim, Won-Yong,Kim, Myung-Kyum,Seong, Chi-Nam The National Institute of Biological Resources 2019 Journal of species research Vol.8 No.1
For the collection of indigenous prokaryotic species in Korea, 35 strains within the class Actinobacteria were isolated from various environmental samples (animals and clinical specimens) in 2017. Each strain showed high 16S rRNA gene sequence similarity (>98.8%) and formed a robust clade with recognized actinobacterial species. The isolates were assigned to 35 species, 22 genera, 15 families, and 8 orders of the class Actinobacteria. There are no official descriptions of these 35 bacterial species in Korea. Morphological properties, basic biochemical characteristics, isolation source, and strain IDs are included in the species descriptions.
Kim, Dong-Uk,Seong, Chi-Nam,Jahng, Kwangyeop,Lee, Soon Dong,Cha, Chang-Jun,Joh, Kiseong,Jeon, Che Ok,Kim, Seung-Bum,Kim, Myung Kyum The National Institute of Biological Resources 2018 Journal of species research Vol.7 No.2
In 2016, as a subset study to discover indigenous prokaryotic species in Korea, a total of 15 bacterial strains were isolated and assigned to the class Betaproteobacteria. From the high 16S rRNA gene sequence similarity (>98.8%) and formation of a robust phylogenetic clade with the closest species, it was determined that each strain belonged to each independent and predefined bacterial species. There is no official report that these 15 species have been described in Korea; therefore, 1 strain of the Aquitalea, 5 strains of the Paraburkholderia, 2 strains of the Comamonas, 1 strain of the Cupriavidus, 1 strain of the Diaphorobacter, 2 strains of the Hydrogenophaga, 1 strain of the Iodobacter, 1 strain of the Massilia and 1 strain of the Rhodoferax within the Betaproteobacteria are described for unreported bacterial species in Korea. Gram reaction, colony and cell morphology, basic biochemical characteristics, and isolation sources are also described in the species description section.
Bin, Bum-Ho,Kim, Dae-Kyum,Kim, Nan-Hyung,Choi, Eun-Jeong,Bhin, Jinhyuk,Kim, Sung Tae,Gho, Yong Song,Lee, Ai-Young,Lee, Tae Ryong,Cho, Eun-Gyung Elsevier 2016 The Journal of investigative dermatology Vol.136 No.5
<P>Skin melanocytes are activated by exposure to UV radiation to secrete melanin-containing melanosomes to protect the skin from UV-induced damage. Despite the continuous renewal of the epidermis, the turnover rate of melanocytes is very slow, and they survive for long periods. However, the mechanisms underlying the survival of melanocytes exposed to UV radiation are not known. Here, we investigated the role of melanocyte-derived extracellular vesicles in melanocyte survival. Network analysis of the melanocyte extracellular vesicle proteome identified the extracellular matrix component fibronectin at a central node, and the release of fibronectin-containing extracellular vesicles was increased after exposure of melanocytes to UVB radiation. Using an anti-fibronectin neutralizing antibody and specific inhibitors of extracellular vesicle secretion, we demonstrated that extracellular vesicles enriched in fibronectin were involved in melanocyte survival after UVB radiation. Furthermore, we observed that in the hyperpigmented lesions of patients with melasma, the extracellular space around melanocytes contained more fibronectin compared with normal skin, suggesting that fibronectin is involved in maintaining melanocytes in pathological conditions. Collectively, our findings suggest that melanocytes secrete fibronectin-containing extracellular vesicles to increase their survival after UVB radiation. These data provide important insight into how constantly stimulated melanocytes can be maintained in pathological conditions such as melasma.</P>
Kang, Heeyoung,Kim, Haneul,Bae, Jin-Woo,Lee, Soon Dong,Kim, Wonyong,Kim, Myung Kyum,Cha, Chang-Jun,Yi, Hana,Im, Wan-Taek,Kim, Seung Bum,Seong, Chi Nam,Joh, Kiseong The National Institute of Biological Resources 2019 Journal of species research Vol.8 No.2
A total of 38 bacterial strains within the classes Bacilli and Deinococci were isolated from various sources in Korea. Samples were collected from animal intestine, urine, soil, tidal flat mud, and kimchi. In the sequence comparison and phylogenetic analysis of 16S rRNA sequences, the 38 isolates were assigned to the classes Bacilli and Deinococci with sequence similarities more than 98.7%. Twenty-four strains and 13 strains were classified the order Bacillales and Lactobacillales in the class Bacilli, respectively. In the order Bacillales, there were nine species in the genus Bacillus, seven species in the genus Paenibacillus, and the remaining eight species in the genera Domibacillus, Halobacillus, Virgibacillus, Lysinibacillus, Paenisporosarcina, Planococcus, Savagea, and Staphylococcus. In the order Lactobacillales, there were four species in the genus Lactobacillus, three species in the genus Leuconostoc, three species in the genus Lactococcus, and the remaining three species in the genera Aerococcus, Enterococcus, and Streptococcus. One species was related to the genus Deinococcus of the order Deinococcales. Most of the isolated strains were Gram-stain-positive, but some were Gram-stain-variable or Gram-stain-negative. Cells were rod or cocci-shaped. Based on the results of 16S rRNA analysis, we report 38 strains as previously unrecorded species to Korea, and the basic characteristics of strains are described herein.