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Yang Yung Yu,Lai Ching Ting 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1
The brown Planthopper (BPH), Nilaparvata lugens is a major pest of rice production in tropical Asia. The appearance of insecticide resistance challenges the control of BPH in field. The development of new insecticide is expensive and time-consuming. Thus, the precise and proper use of existing compounds becomes an important issue in resistance management of this pest. In this study, five commercial insecticides of BPH (permethrin, chlorpyrifos, imidacloprid, clothianidin and thiamethoxam) were tested to explore the toxicity of the binary mixture between different kinds of insecticides. In all combinations of mixture, the mixtures of permethrin and chlorpyrifos displays synergistic effect at three different mixture ratios (1:1, 1:10 and 10:1). The strongest synergism observed in permethrin/ chlorpyrifos mixtures at 1:1 ratio (Combination index, CI = 0.39). Addition of enzyme inhibitor followed by detoxification enzyme activity assays suggested that the mechanism of synergistic effect of permethrin/chlorpyrifos mixture may result from inhibition of the cytochrome P450 monooxygenase and esterase activity. This inference can be supported through two lines of evidence. One is decrease of toxicity when permethrin/chlorpyrifos mixture in a 1:1 ratio plus triphenyl phosphate (TPP) or piperonyl butoxide (PBO), but increase of toxicity when permethrin/chlorpyrifos mixture in a 10:1 ratio plus TPP or PBO. Another is exposure of the 3rd instar nymphs to permethrin/chlorpyrifos mixture after 72 h also significantly decreased both cytochrome P450 monooxygenases and esterase activity. Further field trail showed the mixture of 50 ppm permethrin +50 ppm chlorpyrifos increased the field control efficiency significantly rather than permethrin alone or chlorpyrifos alone. Our study indicated that the mixture of permethrin and chlorpyrifos in a 1:1 ratio might be an effective method for the control of BPH in paddy field.
Kim, Yu-Ri,Yang, Dong-Eun,Lee, Hyuk,Lee, Jung-Eun,Lee, Hyun-Ick,Yang, Suh-Yung,Lee, Hei-Yung The Korean Society for Integrative Biology 1999 Korean journal of biological sciences Vol.3 No.2
The nucleotide sequences of a 504 bp segment of the mitochondrial cytochrome b gene were analyzed to survey the intraspecific variation of the brown frog, Rana dybowskii, collected from nine populations in South Korea. Comparisons of sequence divergence of the cytochrome b gene suggest that the populations examined are clearly classified into two types (type 1 and type 2), diverged from each other by a high value of 14.3-15.9% sequence divergence. The two types are distributed allopatrically in most populations, but only one population occurs sympatrically. In the Tonghae population, their spawning grounds differ in that type 1 spawns in the puddle and type 2 spawns in the mountain creek. Based on the genetic divergences of the cytochrome b gene sequences, the phylogenetic status of Korean R. dybowskii is elucidated by comparing it with related brown frogs distributed in an area adjacent to the Korean Peninsula. Interspecific sequence divergences among type 1, type 2 and other related brown frog species (Russian R. dybowskii, R. pirica, R. ornativentris, R. chensinensis: 2n=24 chromosomes) used in this study ranged from 11.7 to 16.3%. R. dybowskii in Tsushima is very similar to our type 1 (sequence divergence=0-1.6%) and R. chensinensis in western China is closest to our type 2 (sequence divergence=6.8-7.5%).
투기 ·기구운동선수들의 스포츠 상해에 관한 조사 연구 : 慶熙大學運動選手를 中心으로
梁幸錫,宋胤碩,金泰運,朴忠緖,宋禹圭,孫斗玉,金斗煥,池男容,方永鎭,金裕賢,禹善弼,朴英震,金熙圭,安德均,金泰勳,全廷祐,金亨燉,崔名鎭 慶熙大學校 體育科學大學 1992 體育科學論叢 Vol.- No.5
The pmrpose of this study was to Collect the date concerning game athller. For the purpose, 144k university athlete were selectel and investigated on the injufunite symton and caused. 1. In was of skin injunier blister was necooded the higkert on the occarion of fregreucy. 2. In was of muscle iujunier bruire was the higleet. 3. In was of bore injunrer brurie was also the higaleet. 4. In was of joint spualrn was the higaleet occasions. 5. In was of nerve-sensatian injunrer werve pain was shoovn as the hihleat occatians. 6. In the study injunrer time most othleiar were injuited during tIne practie time. 7. In was of season mist athletes were injunrer during the wiater time. 8. many athletes (58.3%) wew injuried aftenovn practice. 9. The most important marson for the injurier were beliebed as lack of warimup and after the injuries waches were mostey the person for quint aid. they weed moassgae and physical therapy among the mazy proceduver.
Yu Jun Wong,Vy H. Nguyen,Hwai-I Yang,Jie Li,Michael Huan Le,Wan-Jung Wu,Nicole Xinrong Han,Khi Yung Fong,Elizabeth Chen,Connie Wong,Fajuan Rui,Xiaoming Xu,Qi Xue,Xin Yu Hu,Wei Qiang Leow,George Boon-B 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.3
Background/Aims: Chronic hepatitis B (CHB) and fatty liver (FL) often co-exist, but natural history data of this dual condition (CHB-FL) are sparse. Via a systematic review, conventional meta-analysis (MA) and individual patient-level data MA (IPDMA), we compared liver-related outcomes and mortality between CHB-FL and CHB-no FL patients. Methods: We searched 4 databases from inception to December 2021 and pooled study-level estimates using a random- effects model for conventional MA. For IPDMA, we evaluated outcomes after balancing the two study groups with inverse probability treatment weighting (IPTW) on age, sex, cirrhosis, diabetes, ALT, HBeAg, HBV DNA, and antiviral treatment. Results: We screened 2,157 articles and included 19 eligible studies (17,955 patients: 11,908 CHB-no FL; 6,047 CHB-FL) in conventional MA, which found severe heterogeneity (I2=88–95%) and no significant differences in HCC, cirrhosis, mortality, or HBsAg seroclearance incidence (P=0.27–0.93). IPDMA included 13,262 patients: 8,625 CHB-no FL and 4,637 CHB-FL patients who differed in several characteristics. The IPTW cohort included 6,955 CHB-no FL and 3,346 CHB-FL well-matched patients. CHB-FL patients (vs. CHB-no FL) had significantly lower HCC, cirrhosis, mortality and higher HBsAg seroclearance incidence (all P≤0.002), with consistent results in subgroups. CHB-FL diagnosed by liver biopsy had a higher 10-year cumulative HCC incidence than CHB-FL diagnosed with non-invasive methods (63.6% vs. 4.3%, P<0.0001). Conclusions: IPDMA data with well-matched CHB patient groups showed that FL (vs. no FL) was associated with significantly lower HCC, cirrhosis, and mortality risk and higher HBsAg seroclearance probability.
Mutual Funds Herding under Financial Crises : Evidence from Taiwan Stock Markets
Yu-Fen Chen,Sheng-Yung Yang,Fu-Lai Lin 한국재무학회 2012 한국재무학회 학술대회 Vol.2012 No.09
This paper intends to investigate herding behavior of mutual fund managers participated in Taiwan stock market, especially as they were facing the regional and global financial crises in 1997 and 2008. Furthermore, it identifies fund managers’ optimal choices of trading strategies as they are facing the shallow-dish characteristics in Taiwan stock market. The empirical results reveal that fund managers do herd as they are picking up their portfolios. Instead of pursuing stocks with high speculative intensity, mutual fund managers adhere to the prudent rule to trade. However, the trading styles are not robust during the period of 1997 Asian financial crisis.
Yu, Hai Yang,Jin, Cheng-Yun,Kim, Kyoung-Sook,Lee, Young-Choon,Park, Shin-Hyung,Kim, Gi-Young,Kim, Wun-Jae,Moon, Hyung-In,Choi, Yung Hyun,Lee, Jai-Heon American Chemical Society 2012 Journal of agricultural and food chemistry Vol.60 No.21
<P>Apoptosis, the main type of programmed cell death, plays an essential role in a variety of biological events. Whereas “classical” apoptosis is dependent on caspase activation, caspase-independent death is increasingly recognized as an alternative pathway. To develop new anticancer agents, oleifolioside A was isolated from Dendropanax morbifera Leveille and the biochemical mechanisms of oleifolioside A-induced apoptosis in HeLa cells were investigated. Exposure to oleifolioside A resulted in caspase activation and typical features of apoptosis, although cell death was not prevented by caspase inhibition. Oleifolioside A treatment induced up-regulation of Bad, loss of mitochondrial membrane potential, nuclear relocation of mitochondrial factors, apoptosis-inducing factor (AIF), endonuclease G (EndoG), and apoptosis induction. This is the first report of anticancer activity of oleifolioside A, and nuclear translocation of AIF and EndoG in oleifolioside A-treated HeLa cells might represent an alternative death signaling pathway in the absence of caspase activity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2012/jafcau.2012.60.issue-21/jf3014475/production/images/medium/jf-2012-014475_0006.gif'></P>
Sodium bromate 음독후 비가역적 급성 신부전 및 청력소실과 시력소실이 발생한 1례
양관모,이원재,권태욱,박규남,나병호,유은영,최승필,김세경 대한응급의학회 1997 대한응급의학회지 Vol.8 No.4
A 39-year-old hairdresser developed sodium bromate poisoning after drinking a cup of hair neutralizer in a suicide attempt. This is the first case of visual loss afteringestion of sodlum bromate. Only few cases are as a cause of acute renal failure reported in medical literature. She presented I day later with anuria, required hemodialysis. Sensorineural hearing loss, often a characteristic finding, was developed.
Convenient Routine Production and Quality Control of ??mIBG
YANG, SEUNG-DAE,SUH, YUNG-SUP,YU, KOOK-HYUN 동국대학교 자연과학연구원 1998 자연과학연구 논문집 Vol.3 No.-
In this paper radiolabelling of radioiodinated m-iodobenzylguanidine ([123I]mlBG) was studied by a Cu(I) assisted nucleophilic exchange reaction in aqueous solution. At 100℃ with 2.0mg cold-mlBG the radiochemical purity reached over 98% at 30 min. The procedure has been utilized with up to 1.0ml 123I(in 0.01N NaOH) or about 100mCi 123I. This method could be used labelling of[123I]mlBG for routine production.