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Lee Ji Joo,Choe Young June,Jeong Hyeongseop,Kim Moonsu,Kim Seonggon,Yoo Hanna,Park Kunhee,Kim Chanhee,Choi Sojin,Sim JiWoo,Park Yoojin,Huh In Sil,Hong Gasil,Kim Mi Young,Song Jin Su,Lee Jihee,Kim Eun- 대한의학회 2021 Journal of Korean medical science Vol.36 No.50
In November 2021, 14 international travel-related severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) B.1.1.529 (omicron) variant of concern (VOC) patients were detected in South Korea. Epidemiologic investigation revealed community transmission of the omicron VOC. A total of 80 SARS-CoV-2 omicron VOC-positive patients were identified until December 10, 2021 and 66 of them reported no relation to the international travel. There may be more transmissions with this VOC in Korea than reported.
Ultra Fast Flash Observatory to observe the prompt photons from Gamma Ray Bursts
Jiwoo Nam,Steven Boggs,G. Ripov,Bruce Grossan,Jin-A Jeon,Joo-Young Jin,Ae-Ra Jung,Ji-Eun Kim,Minsoo Kim,Yong-Kweon Kim,P. Klimov,B. Khrenov,Chang-hwan Lee,Jik Lee,Go-Woon Na,Shin-Woo Nam,Il-Heung Park 한국천문학회 2009 天文學會報 Vol.34 No.1
Jiwoo Kim,Jiwon Yoon,Jaeshik Yoo,Jung-Heun Ha,Yoonhwa Jeong,Misook Kim 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
The attention has been raised on Momordica charantia as the prevention and treatment of diabetes mellitus. We fermented Momordica charantia extract (MC) by probiotic Leuconostoc mesenteroides MKSR (MKSR), Leu. mesenteroides MKJW (MKJW) or Lactobacillus plantarum MKHA 15 (MKHA15) and evaluated their functionalities. After 24h fermentation, MKSR, MKJW, and MKHA15 significantly increased the number of their viable cells with pH decrease. The α-glucosidase inhibitory activity (AGI) was the highest in MKJW-MC (58.01%) and MKSR-MC (54.66%) when fermented 12°Brix MC, 4% sucrose, and 1% maltose at pH 6.5. Both fermented MCs significantly enhanced their DPPH radical scavenging ability. MKHA15-MC did barely affect AGI and DPPH radical scavenging ability. Increased acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) inhibitory activities were observed in all fermented MCs compared to MC extract. Strong AChE and BuChE were obtained in MKSR-MC. It might be suggested that probiotic MKSR or MKJW fermented MC can be used as potential multi-heath functional products for anti-diabetic, anti-dementia, and antioxidant treatment.
Optimizing the Production of Red Pigments with Antioxidant Effect by Using Perenniporia fraxinea
Jiwoo KIM,Jungheon LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
In this study, the optimal medium conditions for the maximal production of red pigment using Perenniporia fraxinea mycelium were identified and the antioxidant ability of red pigment was evaluated. The red pigment produced from natural products has an antioxidant effect and can be effectively used to remove free radicals. After culturing for 3 weeks at 25℃. and 150 rpm, the culture medium was centrifuged and absorbance was measured at 300 ㎚ to measure the degree of redness of the medium according to the culture conditions. The red pigment is formed through the medium using malt extract with a low nitrogen source (about 0.1%) asthe main raw material, but when the nitrogen source content increases, the production of the red pigment decreases. P. fraxinea grown in the malt extract-free medium did not produce red pigment even though a small amount of nitrogen was added to the medium. In the case of a medium using fructose as a carbon source and tryptone as a nitrogen source, more red pigment was produced. As a result of using the polyphenol method for antioxidant measurement, the redder the color of the culture supernatant, the better the antioxidant activity.
Statistical Analysis of Pc1 Pulsations Observed by a BOH Magnetometer
Kim, Jiwoo,Hwang, Junga,Kim, Hyangpyo,Yi, Yu The Korean Space Science Society 2020 Journal of Astronomy and Space Sciences Vol.37 No.1
Pc1 pulsations are important to consider for the interpretation of wave-particle interactions in the Earth's magnetosphere. In fact, the wave properties of these pulsations change dynamically when they propagate from the source region in the space to the ground. A detailed study of the wave features can help understanding their time evolution mechanisms. In this study, we statistically analyzed Pc1 pulsations observed by a Bohyunsan (BOH) magneto-impedance (MI) sensor located in Korea (L = 1.3) for ~one solar cycle (November 2009-August 2018). In particular, we investigated the temporal occurrence ratio of Pc1 pulsations (considering seasonal, diurnal, and annual variations in the solar cycle), their wave properties (e.g., duration, peak frequency, and bandwidth), and their relationship with geomagnetic activities by considering the Kp and Dst indices in correspondence of the Pc1 pulsation events. We found that the Pc1 waves frequently occurred in March in the dawn (1-3 magnetic local time (MLT)) sector, during the declining phase of the solar cycle. They generally continued for 2-5 minutes, reaching a peak frequency of ~0.9 Hz. Finally, most of the pulsations have strong dependence on the geomagnetic storm and observed during the early recovery phase of the geomagnetic storm.
Kim Jiwoo,Kim Joohoon 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.11
We reported the electrochemically induced deposition of hydroxyl-terminated poly(amidoamine) dendrimers encapsulating Pt nanoparticles on the surface of indium tin oxide (ITO). The electrochemical deposition led to significantly high surface coverage of Pt nanoparticles encapsulated inside the dendrimers on ITO surfaces, which allowed enhanced (i.e., ca. 212-fold) electrochemiluminescence of Ru(bpy)3 2+/tripropylamine on the modified ITOs compared to unmodified ITO.