Kim, Yong-In;Cho, Seong Hyun;Kim, Bo-Yun;Lee, Jung-Hoon;Kang, Dae-Hyun;Kim, Soonok;Doudkin, Roman V.;Kim, Young-Dong
Korean Journal of Plant Taxonomy
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v.45
no.4
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pp.306-317
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2015
This study was conducted to address the taxonomic status of the Korean endemic species Saxifraga octopetala, which is sometimes considered conspecific to Micranthes manchuriensis. Extensive molecular phylogenetic analysis using nrITS sequences as well as morphological examination of type specimens of the two species were undertaken to ascertain the phylogenetic position and species delimitation of S. octopetala. In the resulting nrITS trees, a total of 65 accessions representing S. octopetala grouped together and nested within the Micranthes clade, exhibiting a close relationship with M. nelsoniana and M. manchuriensis. Multiple accessions of M. manchuriensis collected from China and Russia also formed a clade, showing a sister group relationship with M. nelsoniana var. pacifica and M. fusca. The ambiguous species entity of S. octopetala is thought to have originated from Nakai's misinterpretation of Wilford's collection (type specimens of M. manchuriensis), which is a complex collection including an inflorescence of M. nelsoniana. In spite of apparent morphological similarity between S. octopetala and M. manchuriensis, they differ in the presence and absence of underground stolons. The distinct position of S. octopetala within the Micranthes clade on the nrITS tree suggests that it should retain species status in Micranthes. Thus a new combination (Micranthes octopetala) is proposed.
Lim, Sangwook;Choi, Jinho;An, Sohyun;Cho, Kwang Hwan;Lee, Sang Hoon;Lee, Rena;Cho, Sam Ju
Progress in Medical Physics
/
v.27
no.1
/
pp.46-53
/
2016
Periodical calibrations of radiation detectors are important for accurate quality assurance of therapeutic linac. The measuring instruments such as ion-chamber, thermometer, barometer, and survey meter should be calibrated periodically. Period of calibration for these instruments is suggested 6 month to one year in Korea and two years in other countries nowadays. Therefore, the determination of reasonable period for calibration is needed. In this study, we plan to utilize the results of these survey; frequent in use, how to use and stability of instruments, to determine the optimized period of calibration for the instruments in the departments of radiation oncology in Korea based on the ILAC-G24. The SurveyMonkey web-based survey tool was used and the objects of survey were 18 department of radiation oncology in university hospitals, and 15 departments were answered. The 64 questionnaires which supposed to be answered in 50 minutes were classified as the information of candidates, the thermometer, the barometer, the surveymeter, and the ion-chamber. The thermometers and the barometers were not under periodical calibration for more than half of candidates. The periods of calibration of surveymeters were 6 month to 1 year. We expect that the calibration period can be determined based on these survey results.
Journal of Fisheries and Marine Sciences Education
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v.27
no.1
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pp.41-48
/
2015
Juvenile banded catfish(Pseudobagurus fulvidraco, mean length $10.4{\pm}0.37cm$ and mean weight $14.5{\pm}0.46g$) were exposed to several nitrite(${NO_2}^-$) concentrations for 96h at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$. The result showed that cumulative mortalities of fish to ${NO_2}^-$ levels of 12.4, 19.8, 33.9 and 53.6 mg/L at pH levels of $6.18{\pm}0.54$ were 20, 25, 40 and 85%, respectively. At pH $6.5{\pm}0.54$, mortalities to ${NO_2}^-$ 22.4, 36.4, 45.3 and 63.2 mg/L were 25, 35, 50 and 100%, respectively. At pH $7.07{\pm}0.22$, mortalities to ${NO_2}^-$ 25.5, 45.7, 56.3 and 66.4 mg/L were 0, 55, 70 and 100%, respectively. The 96h-$LC_{50}$(median lethal concentration, $LC_{50}$) of fish to several ${NO_2}^-$ concentrations at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$ were assessed in these experiments. 96h-$LC_{50}$ at pH levels of $6.18{\pm}0.54$, $6.5{\pm}0.30$ and $7.07{\pm}0.22$ were 32.68, 40.49 and 45.85 mg/L, respectively. It indicated that acute toxicity of ${NO_2}^-$ to juvenile banded catfish increased with low levels of pH and lengthening of exposure time to ${NO_2}^-$. In particular, smaller fish(mean weight $14.5{\pm}0.46g$) were more sensitive to ${NO_2}^-$ than larger fish(mean weight $81.7{\pm}1.42g$; not published). The 96h-$LC_{50}$ of juvenile banded catfish to ${NO_2}^-$ would be primary guideline for water quality management in the intensive culture system such as RAS and BFT.
Kim, Byung-Wan;Yun, Hyun-Joung;Jeon, Hyeon-Suk;Yun, Hyung-Joong;Kim, Chang-Hyun;Park, Sun-Dong
The Korea Journal of Herbology
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v.21
no.2
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pp.37-46
/
2006
Objectives : The purpose of this study was to investigate the effect of Dangguibohyultang (DB) and its combination (DB-I; Astragali membraneus BUNGE : Angelica gigas NAKAI=5:1, DB-II; Astragali membraneus BUNGE:Angelica gigas NAKAI=1:1, DB-III; Astragali membraneus BUNGE:Angelica gigas NAKAI=1:5,) on apoptosis in human colorectal adenocarcinoma HCT116 cells. Methods : To study the cytotoxic effect of methanol extract of DB-I, DB-II and DB-III on HCT116 cells, the cell viability was determined by XTT reduction method and ttypan blue exclusion assay. To confirm the induction of apoptosis, the cleavage of poly ADP-ribose polymerase (PARP), a substrate for caspase-3 and a typical sign of apoptosis, and the activation of procaspase-3, -8 and -9 were examined by western blot analysis. Furthermore, DB-induced apoptosis was confirmed by DNA fragmentation. The release of cytochrome C from mitochondria to cytosol, the level of Bcl-2 and Bax, and the expressions of Raf/MEK/ERK were examined by western blot analysis. Results : DB-I and DB-II reduced proliferation of HCT116 cells in a dose-dependent manner. DB-I and DB-II decreased procaspase-3, -8, -9 levels in a dose-dependent manner and induced the clevage of PARP. DB-I and DB-II also triggered the mitochondrial apoptotic signaling by increasing the release of cytochrome C from mitochondria to cytosol, decreasing of anti-apoptotic Bcl-2, and increasing of pro-apoptotic Bax. DB-I and DB-II decreased the activation of Ras/Raf/MEK/ERK cascade in a dose-dependent manner. Conclusion : These results suggest that DB-I and DB-II induce apoptosis via mitochondrial pathway in HCT116 cells. Furthermore, Raf/MEK/ERK cascade is involved in DB-induced apoptosis. These results suggest that DB is potentially useful as a chemotherapeutic agent in human liver cancer.
Kim, Jung Hyun;Park, Jong Youn;Lee, Jeong Yong;Lee, Jin Hwan;Hwang, Hyung Kyu;Cho, Jae Kwon
Korean Journal of Ichthyology
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v.29
no.1
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pp.13-21
/
2017
We investigated that changes of survival rate and hematological factors in sevenband grouper (Epinephelus septemfasciatus), exposed to ammonia. First, the fish was exposed and was observed survival rate. We observed the survival rate of the fish when exposed at each ammonia concentrations (0, 0.35, 0.4, 0.5, 0.8 mg/L, $NH_3$) for 96 hours. The 96-h $LC_{50}$ (lethal ambient concentration for 50% of the population) of $NH_4^+$ and un-ionized ammonia ($NH_3$) for sevenband grouper were 26.7 and 0.6 mg/L, respectively. Secondly, we exposed the fish to 96-h $LC_{50}$ ammonia concentration (0.6 mg/L) for 96 hours, then sampled the blood of groupers for analysis of cortisol, glucose, $NH_3$, GOT, GPT, total protein (TP), electrolytes ($Na^+$, $Cl^-$) and osmolality in plasma. The plasma cortisol, glucose, GOT and GPT were increased with increasing of elapsed time and ammonia concentration. In addition, the $NH_3$ and total protein in plasma were significantly increased to 12 hours exposed to ammonia, and then decreased. But, the values were significantly higher than the control. The plasma electrolytes ($Na^+$, $Cl^-$) and osmolality were decreased with increasing of elasped time. The results in the present study suggest that the continuous exposure of ammonia to juveniles of sevenband grouper may be a stressor and negative influence.
Kim, Si-Nae;Jun, Sang-Min;Lee, Hyun-Ji;Hwang, Soon-Ho;Choi, Soon-Kun;Kang, Moon-Seong
Journal of The Korean Society of Agricultural Engineers
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v.62
no.4
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pp.33-43
/
2020
In order to reduce damage from farmland inundation caused by recent climate change, it is necessary to predict the risk of farmland inundation accurately. Inundation modeling should be performed by considering multiple time distributions of possible rainfalls, as digital forecasts of Korea Meteorological Administration is provided on a six-hour basis. As building multiple inputs and creating inundation models take a lot of time, it is necessary to shorten the forecast time by building a data base (DB) of farmland inundation probability. Therefore, the objective of this study is to establish a DB of farmland inundation probability in accordance with forecasted rainfalls. In this study, historical data of the digital forecasts was collected and used for time division. Inundation modeling was performed 100 times for each rainfall event. Time disaggregation of forecasted rainfall was performed by applying the Multiplicative Random Cascade (MRC) model, which uses consistency of fractal characteristics to six-hour rainfall data. To analyze the inundation of farmland, the river level was simulated using the Hydrologic Engineering Center - River Analysis System (HEC-RAS). The level of farmland was calculated by applying a simulation technique based on the water balance equation. The inundation probability was calculated by extracting the number of inundation occurrences out of the total number of simulations, and the results were stored in the DB of farmland inundation probability. The results of this study can be used to quickly predict the risk of farmland inundation, and to prepare measures to reduce damage from inundation.
Kim, Chung-Hyun;Park, Jae-Ho;Lim, Jong-Kuk;Lee, Kon-Joo;Chung, Gyu-Young;Jeong, Hyung-Jin
Korean Journal of Medicinal Crop Science
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v.11
no.1
/
pp.31-39
/
2003
The antioxidative activities and biological properties in the EtOAc extracts and purified extracts of Orostachys japonicus were measured by assay of DPPH, xanthine/xanthine oxidase and mammalian cells(2-12). Scavenging of DPPH radical and inhibition of xanthine/xanthine oxidase of EtOAc extracts were showed the highest activity in the arable land and in September. The S-4 fraction showed the highest activity among the silica-gel column chromatography fractions. LH-4 fraction showed higher activity than the other fractionsins in assay of DPPH and xanthine/xanthine oxidase. Fatty acids and phenolic compounds were identified by GC/MS and main compounds were 1,2,3-benzenetriol, alpha-androsta-7,14-diene in LH-4 fraction. The activities of POD and SOD in samples havested on different habitats were high such as arable land> intermountain> seashore. That of POD and SOD in crude extracts of late stage were higher than early stage. Isozyme bands of crude extracts samplinged in all habitats and all growing stages showed two bands and the signal intensity showed strongly according to passage of growing stage. The purified extracts of LH-4 fraction showed excellent inhibition effect in proliferation of HL-60 cells and markedly suppressed colony formation in mouse fibroblast cells. Dose response between partially purified extracts(400ppm) and negative control did not produced statistically significant reduction in colony formation.
Journal of the Korea Academia-Industrial cooperation Society
/
v.12
no.5
/
pp.2187-2196
/
2011
The objective of this study was to investigate the effect of gait training using rhythmic auditory stimulation on gait symmetry of stroke patients. Forty chronic stroke patients were divided into four groups by intervention. Group A and B received auditory stimulation when they walk with comfortable gait speed. Group A received auditory stimulation to paralyzed side while group B to non-paralyzed side. Group C and D received auditory stimulation with 10% faster gait speed than their comfortable gait speed. Group C received auditory stimulation to paralyzed side while group D to non-paralyzed side. Gait training using auditory stimulation was done in each group during five minutes. Gait symmetry was evaluated by formula and temporal variables of gait were measured by gait analysis system. Step time was decreased significantly in all groups except group A (P<.05), and gait symmetry was also improved significantly in all groups except group A (P<.05). Cadence was increased significantly in all groups except group A (p<.05), but velocity was not increased in all groups. Therefore we conclude that RAS gait training is effective in improving gait symmetry and can be useful to stroke patient's gait training.
Proceedings of the Korea Crystallographic Association Conference
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2002.11a
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pp.5-6
/
2002
The new spectrometer for X-ray Induced Electron Emission Spectroscopy (XIEES) .has been recently developed in KRISS in collaboration with PTI (Russia). The spectrometer allows to perform research using the XAFS, SXAFS, XANES techniques (D.C.Koningsberger and R.Prins, 1988) as well as the number of techniques from XIEES field(L.A.Bakaleinikov et all, 1992). The experiments may be carried out with registration of transmitted through the sample x-rays (to investigate bulk samples) or/and total electron yield (TEY) from the sample surface that gives the high (down to several atomic mono-layers in soft x-ray region) near surface sensitivity. The combination of these methods together give the possibility to obtain a quantitative information on elemental composition, chemical state, atomic structure for powder samples and solids, including non-crystalline materials (the long range order is not required). The optical design of spectrometer is made according to Johannesson true focusing schematics and presented on the Fig.1. Five stepping motors are used to maintain the focusing condition during the photon energy scan (crystal angle, crystal position along rail, sample goniometer rail angle, sample goniometer position along rail and sample goniometer angle relatively of rail). All movements can be done independently and simultaneously that speeds up the setting of photon energy and allows the using of crystals with different Rowland radil. At present six curved crystals with different d-values and one flat synthetic multilayer are installed on revolver-type monochromator. This arrangement allows the wide range of x-rays from 100 eV up to 25 keV to be obtained. Another 4 stepping motors set exit slit width, sample angle, channeltron position and x-ray detector position. The differential pumping allows to unite vacuum chambers of spectrometer and x-ray generator avoiding the absorption of soft x-rays on Be foil of a window and in atmosphere. Another feature of vacuum system is separation of walls of vacuum chamber (which are deformed by the atmospheric pressure) from optical elements of spectrometer. This warrantees that the optical elements are precisely positioned. The detecting system of the spectrometer consists of two proportional counters, one scintillating detector and one channeltron detector. First proportional counter can be used as I/sub 0/-detector in transmission mode or by measuring the fluorescence from exit slit edge. The last installation can be used to measure the reference data (that is necessary in XANES measurements), in this case the reference sample is installed on slit knife edge. The second proportional counter measures the intensity of x-rays transmitted through the sample. The scintillating detector is used in the same way but on the air for the hard x-rays and for alignment purposes. Total electron yield from the sample is measured by channeltron. The spectrometer is fully controlled by special software that gives the high flexibility and reliability in carrying out of the experiments. Fig.2 and fig.3 present the typical XAFS spectra measured with spectrometer.
Ryu, Jeong Hoon;Kang, Moon Seong;Jun, Sang Min;Park, Jihoon;Lee, Kyeong-Do
Journal of The Korean Society of Agricultural Engineers
/
v.59
no.1
/
pp.81-96
/
2017
Along with climate change, it is reported that the scale and the frequency of extreme climate events (e.g. heavy rain, typhoon, etc.) show unstable tendency of increase. In case of Korea, also, the frequency of heavy rainfall shows increasing tendency, thus causing natural disaster damage in downtown and agricultural areas by rainfall that exceeds the design criteria of hydraulic structures. In order to minimize natural disaster damage, it is necessary to analyze how extreme precipitation event changes under climate change. Therefore a new design criteria based on non-stationarity frequency analysis is needed to consider a tendency of future extreme precipitation event and to prepare countermeasures to climate change. And a quantitative and objective characteristic analysis could be a key to preparing countermeasures to climate change impact. In this study, non-stationarity frequency analysis was performed and inundation risk indices developed by 4 inundation characteristics (e.g. inundation area, inundation depth, inundation duration, and inundation radius) were assessed. The study results showed that future probable rainfall could exceed the existing design criteria of hydraulic structures (rivers of state: 100yr-200yr, river banks: 50yr-100yr) reaching over 500yr frequency probable rainfall of the past. Inundation characteristics showed higher value in the future compared to the past, especially in sections with tributary stream inflow. Also, the inundation risk indices were estimated as 0.14 for the past period of 1973-2015, and 0.25, 0.29, 1.27 for the future period of 2016-2040, 2041-2070, 2071-2100, respectively. The study findings are expected to be used as a basis to analyze future inundation damage and to establish management solutions for rivers with inundation risks.
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