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Cho, Byoung Ok,Yin, Hong Hua,Park, Sang Hyun,Byun, Eui Baek,Ha, Hun Yong,Jang, Seon Il Informa UK (TaylorFrancis) 2016 Bioscience, biotechnology, and biochemistry Vol.80 No.8
<P>Diospyros lotus is traditionally used for the treatment of diabetes, diarrhea, tumor, and hypertension. The purpose of this study was to investigate the anti-inflammatory effect and underlying molecular mechanisms of myricetin in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. Myricetin dose-dependently suppressed the production of pro-inflammatory mediators (NO, iNOS, PGE(2), and COX-2) in LPS-stimulated RAW264.7 macrophages. Myricetin administration decreased the production of NO, iNOS, TNF-, IL-6, and IL-12 in mice. Myricetin decreased NF-B activation by suppressing the degradation of IB, nuclear translocation of p65 subunit of NF-B, and NF-B DNA binding activity in LPS-stimulated RAW264.7 macrophages. Moreover, myricetin attenuated the phosphorylation of STAT1 and the production of IFN- in LPS-stimulated RAW264.7 macrophages. Furthermore, myricetin induced the expression of HO-1 through Nrf2 translocation. In conclusion, these results suggest that myricetin inhibits the production of pro-inflammatory mediators through the suppression of NF-B and STAT1 activation and induction of Nrf2-mediated HO-1 expression in LPS-stimulated RAW264.7 macrophages.</P>
Battery Charge and Discharge Characterisitcs in Small Scaled Photovoltaic System
Cho, Geum-Bae,Baek, Hyung-Lae,Choi, Youn-Ok CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.2
In any photovoltaic system, a battery storage system is needed to save some extra power and to meet the required power by load, likely, in a cloudy days or night time. Especially, for a small scale photovoltaic(PV) system in household load application, the battery storage system has a very important role for continuos power supply to household loads in night time. Even though a battery storage system help to improve the availability of solar power, the total availability of the solar power can be restricted to around 80% due to its ingerent losses involving in evergy transformation; charging and discharging chemical reactions. nowadays, the operating efficiency and performance are treated as so important factors in order to evaluate the PV system economially. This paper describes charge and discharge characteristics of a small scale PV system under controlling of a new and simple battery management system. This battery management system is composite controller having a voltage comparator, a power MOSFET switch and accessary instead of conventional relay switching devices. Experimental results show that the proposed battery management system is superior the conventional relay switching system in its the operating performance and the system reliability of the small scale PV system.
Cho, Jin-Gyeong,Song, Na-Young,Nam, Tae-Gyu,Shrestha, Sabina,Park, Hee-Jung,Lyu, Ha-Na,Kim, Dae-Ok,Lee, Gihwan,Woo, Young-Min,Jeong, Tae-Sook,Baek, Nam-In American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.43
<P>The transgenic rice cultivar of Oryza sativa spp. <I>japonica</I> cv. Hwa-Young, C1/R-S transgenic rice (C1/R-S rice), is a flavonoid-rich cultivar of rice. The grains of C1/R-S rice were extracted with aqueous MeOH, and the concentrated extract was partitioned with EtOAc, <I>n</I>-BuOH, and H<SUB>2</SUB>O, successively. Repeated silica gel, octadecyl silica gel (ODS), and Sephadex LH-20 column chromatographies for the EtOAc and <I>n</I>-BuOH fractions afforded four new flavonoids (compounds <B>2</B>, <B>3</B>, <B>7</B>, and <B>8</B>) along with four known flavonoids: (+)-3′-<I>O</I>-methyltaxifolin (<B>1</B>), brassicin (<B>4</B>), isorhamnetin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucosyranoside (<B>5</B>), and 3′-<I>O</I>-methyltaxifolin-5-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>6</B>). The new flavonoids were identified as 3′-<I>O</I>-methyltaxifolin-7-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>2</B>), 3′-<I>O</I>-methyltaxifolin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>3</B>), isorhamnetin-7-<I>O</I>-β-<SMALL>d</SMALL>-cellobioside (brassicin-4″-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside) (<B>7</B>), and brassicin-4′-<I>O</I>-β-<SMALL>d</SMALL>-glucosyranoside (<B>8</B>) from the result of spectroscopic data including nuclear magnetic resonance spectrometry (NMR), mass spectrometry (MS), and infrared spectroscopy (IR). Also, quantitative analysis of major flavonoids (compounds <B>2</B>, <B>3</B>, and <B>8</B>) in C1/R-S rice, <I>O. sativa</I> spp. <I>japonica</I> cv. Hwa-Young (HY), and a hybrid of two cultivar (C1/R-S rice/HY) extracts was performed using HPLC experiment. The isolated flavonoids were evaluated for their radical-scavenging effect on DPPH and ABTS radicals.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-43/jf403072c/production/images/medium/jf-2013-03072c_0003.gif'></P>
TOWARD A NEXT GENERATION SOLAR CORONAGRAPH: DIAGNOSTIC CORONAGRAPH EXPERIMENT
Cho, Kyung-Suk,Yang, Heesu,Lee, Jae-Ok,Bong, Su-Chan,Kim, Jihun,Choi, Seonghwan,Park, Jongyeob,Cho, Kyuhyoun,Baek, Ji-Hye,Kim, Yeon-Han,Park, Young-Deuk The Korean Astronomical Society 2020 Journal of The Korean Astronomical Society Vol.53 No.4
The Korea Astronomy and Space Science Institute (KASI) has been developing a next-generation coronagraph (NGC) in cooperation with NASA to measure the coronal electron density, temperature, and speed simultaneously, using four different optical filters around 400 nm. KASI organized an expedition to demonstrate the coronagraph measurement scheme and the instrumental technology during the 2017 total solar eclipse (TSE) across the USA. The observation site was in Jackson Hole, Wyoming, USA. We built an eclipse observation system, the Diagnostic Coronal Experiment (DICE), composed of two identical telescopes to improve the signal-to-noise ratio. The observation was conducted at four wavelengths and three linear polarization directions in the limited total eclipse time of about 140 seconds. We successfully obtained polarization data for the corona but we were not able to obtain information on the coronal electron temperature and speed due to the low signal-to-noise ratio of the optical system and strong emission from prominences located at the western limb. In this study, we report the development of DICE and the observation results from the eclipse expedition. TSE observation and analysis with our self-developed instrument showed that a coronagraph needs to be designed carefully to achieve its scientific purpose. We gained valuable experience for future follow-up NASA-KASI joint missions: the Balloon-borne Investigation of the Temperature and Speed of Electrons in the Corona (BITSE) and the COronal Diagnostic EXperiment (CODEX).