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Haloferula chungangensis sp. nov., isolated from marine sediment.
Kang, Hyeonji,Traiwan, Jitsopin,Weerawongwiwat, Veeraya,Jung, Min Young,Jeong, Ji Hoon,Myung, Soon Chul,Lee, Keun Chul,Lee, Jung-Sook,Kim, Wonyong Society for General Microbiology 2013 International journal of systematic and evolutiona Vol.63 No.1
<P>A Gram-stain-negative, non-spore-forming, non-motile, strictly aerobic, rod-shaped bacterial strain, designated CAU 1074(T), was isolated from marine sediment and its taxonomic position was investigated using a polyphasic approach. Strain CAU 1074(T) grew optimally at 30 C and pH 6.5. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CAU 1074(T) formed a distinct lineage within the genus Haloferula and was most closely related to Haloferula harenae KCTC 22198(T) (96.0% similarity). Strain CAU 1074(T) contained MK-9 as the major isoprenoid quinone, and iso-C(14:0,) C(16:1)ω9c and C(16:0) as the major fatty acids. The cell wall peptidoglycan contained meso-diaminopimelic acid. The major whole-cell sugars were glucose, xylose, mannose and ribose. The polar lipids were composed of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, aminoglycolipid and two unidentified phospholipids. The DNA G+C content of the strain was 64.0 mol%. On the basis of phenotypic and chemotaxonomic data, and phylogenetic inference, strain CAU 1074(T) should be classified as a member of a novel species in the genus Haloferula, for which the name Haloferula chungangensis sp. nov. is proposed; the type strain is CAU 1074(T) (= KCTC 23578(T) = CCUG 61920(T)). An emended description of the genus Haloferula is also provided.</P>
( Hyeonji Kim ),( Jeong Seong Yang ),( Minji Kang ),( Seung Heon Lee ),( Nakwon Kwak ),( Jae-joon Yim ),( Young Ae Kang ),( Hong Jo Choi ),( Jong-seok Kim ),( Hwa-jung Kim ),( Jake Whang ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.0
Background Nontuberculous mycobacteria pulmonary disease (NTM PD) is rapidly increasing worldwide, including in south Korea. As part of the trend to find biomarkers for NTM PD, a multicenter prospective observational cohort study named ‘NTM-KOREA’ involving seven hospitals and two institutes in south Korea was initiated. In order to discover meaningful bacterial factors from preserved strains, the central role of Korean Mycobacterium Resource Center (KMRC) in KIT has been extended from strain preservation to research since 2018. Methods In South Korea, all NTM drug susceptibility tests have been performed at KIT except one tertiary hospital. When the patient's treatment is initiated, when the negative conversion fails after treatment, or when relapse/reinfection is observed, a drug susceptibility test is requested, and the clinical isolates are then stored in KMRC. Some strains are specifically registered in a mycobacterial extract library consisting of cell wall lipidomes and secreted proteomes. These strains are cultured on solid medium, and by observing the colonies, it is possible to confirm the presence of mixed infection and the rough or smooth colony surface morphology concerning NTM disease progression. Results From October 2018 to the present, a total of 7,000 NTM isolates of NTM-KOREA have been collected, of which 350 strains have been registered in the extract library additionally. Through a recent joint study with Seoul National University Hospital, we found that the treatment rate of clofazimine as an NTM treatment is related to minimum inhibitory concentration of each clinical isolate. Conclusions Despite various studies on NTM PD, the existence of biomarkers and bacterial factors applicable to diagnosis and treatment is still not satisfactory. When considering as an infectious disease, the causative agent is also very important as well as biomarkers. Accordingly, we will continue to investigate the characteristics of Korean NTM isolates extensively and to select prominent bacterial factors.
( Hyeonji Kim ),( Jeong Seong Yang ),( Minji Kang ),( Ahn Nam Joung ),( Cha So Jeong ),( Nakwon Kwak ),( Jae-joon Yim ),( Young Ae Kang ),( Jong-seok Kim ),( Hwa-jung Kim ),( Gyeong In Lee ),( Seung H 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Background Nontuberculous mycobacterial pulmonary disease (NTM PD) is increasing not only in South Korea but also worldwide. The seriousness of NTM PD is further raised because of the high relapse rate and low cure rate in its treatment. For the optimization of treatments for NTM PD patients, the first multicenter prospective cohort study named ‘NTM-KOREA’ involving eight hospitals and two institutes in South Korea and East Asia was initiated. One of these institutions, the Korean Tuberculosis Research Institute (KIT), plays the role of a strain bank through the Korea Mycobacterium Resource Center (KMRC) collecting and preserving clinical isolates from NTM-KOREA. Methods In South Korea, all NTM drug susceptibility tests have been performed at KIT except one tertiary hospital. When the patient's treatment is initiated, when the negative conversion fails after treatment, or when relapse/reinfection is observed, a drug susceptibility test is requested, and the clinical isolates are then stored in KMRC. Some strains are specifically registered in a mycobacterial extract library consisting of cell wall lipidomes and secreted proteomes. These strains are cultured on solid medium, and by observing the colonies, it is possible to confirm the presence of mixed infection and the rough or smooth colony surface morphology concerning NTM disease progression. Results From October 2018 to the present, a total of 10,510 NTM isolates of NTM-KOREA have been collected, of which 1,387 strains have been registered in the extract library additionally. Conclusion Despite various studies on NTM PD, the existence of biomarkers and bacterial factors applicable to diagnosis and treatment is still not satisfactory. In the future, genetic mutations will be searched through whole genome sequencing (WGS) analysis of treatment-failing/relapse strains, and related SNP will be searched and selected by comparing them with the control group. We will continue to investigate the characteristics of Korean NTM isolates extensively.
수계에서 반응 가능한 실란화를 통한 셀룰로오스 나노피브릴의 소수화
박현지(Hyeonji Park),육심엽(Simyub Yook),박신영(Shin Young Park),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.3
Cellulose nanofibrils (CNF) is a renewable material, which has a high aspect ratio, large specific surface area and high mechanical strength. However, since the hydrophilicity of CNF limits the expansion of the application, CNF is required to be hydrophobized in some cases. In this study, silylation of CNF under an aqueous system was investigated in order to increase the hydrophobicity of CNF. Methyltrimethoxysilane (MTMS) was selected as a silylating agent. The hydrophobicity of CNF was greater under acidic conditions and at a 1:1 oven-dried weight ratio of CNF and MTMS. The excessive amount of MTMS did not enhance the hydrophobicity of CNF. Curing treatment should be followed by the silylation of CNF. The hydrophobization of CNF could be carried out successfully under an aqueous system without an organic solvent.
Algoriphagus chungangensis sp. nov., isolated from a tidal flat sediment.
Kang, Hyeonji,Weerawongwiwat, Veeraya,Jung, Min Young,Myung, Soon Chul,Kim, Wonyong Society for General Microbiology 2013 International journal of systematic and evolutiona Vol.63 No.2
<P>A Gram-stain-negative, non-spore-forming, non-motile, strictly aerobic, rod-shaped bacterial strain, designated CAU 1002(T), was isolated from a tidal flat sediment and its taxonomic position was investigated using a polyphasic approach. Strain CAU 1002(T) grew optimally at 30 C and pH 7.5. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CAU 1002(T) formed a distinct lineage within the genus Algoriphagus and was most closely related to Algoriphagus lutimaris KCTC 22630(T) and Algoriphagus halophilus KCTC 12051(T) (97.75 and 97.74?% 16S rRNA gene sequence similarity, respectively). The strain contained MK-7 as the major isoprenoid quinone and iso-C(15?:?0) and C(16?:?1)ω7c and/or iso-C(15?:?0) 2-OH (summed feature 3) as the major fatty acids. The cell-wall peptidoglycan of strain CAU 1002(T) contained meso-diaminopimelic acids. The major whole-cell sugars were glucose, arabinose, sucrose, and ribose. The polar lipid profile was composed of phosphatidylethanolamine, five unidentified aminolipids, one unidentified aminophospholipid, one unidentified phospholipid, one unidentified aminoglycolipid, one unidentified glycolipid and twelve unidentified lipids. The DNA G+C content of strain CAU 1002(T) was 38.0 mol%. On the basis of phylogenetic inference, phenotypic, chemotaxonomic and genotypic data, strain CAU 1002(T) should be classified into the genus Algoriphagus as a member of a novel species, for which the name Algoriphagus chungangensis sp. nov. is proposed. The type strain is CAU 1002(T) (?=?KCTC 23759(T)?=?CCUG 61890(T)). The description of the genus Algoriphagus is emended.</P>
홍현지(Hyeonji Hong),정미림(Mirim Jung),염은섭(Eunseop Yeom) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.3
Increase of blood viscosity significantly changes the flow resistance and wall shear stress which are related with cardiovascular diseases. For measurement of blood viscosity, microfluidic method has proposed by monitoring pressure between sample and reference flows in the downstream of a microchannel with two inlets. However, it is difficult to apply this method to unknown flow conditions. To measure blood viscosity under unknown flow conditions, a microfluidic method based on micro particle image velocimetry(PIV) is proposed in this study. Flow rate in the microchannel was estimated by assuming velocity profiles represent mean value along channel depth. To demonstrate the measurement accuracy of flow rate, the flow rates measured at the upstream and downstream of a T-shaped microchannel were compared with injection flow rate. The present results indicate that blood viscosity could be reasonably estimated according to shear rate by measuring the interfacial width and flow rate of blood flow. This method would be useful for understanding the effects of hemorheological features on the cardiovascular diseases.