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남현빈,정세진,구민석,오예진,김용민,이훈희,윤수정,임정균 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
In addition to the development of functional cosmetics, technology to increase percutaneous absorption rate when applied to the skin is an important task. In this experiment, oleic acid was used as a skin absorption promoter, and its effect on transdermal permeability of adenosine was studied and analyzed using a skin-like membrane. As a result of the experiment, it was investigated that the permeability coefficient and concentration of adenosine are proportional to the content of oleic acid. This indicates that a high proportion of oleic acid is effective as a skin absorption promoter.
Sujeong Min,Chang-Gyu Park,Si-Woo Lee,Yoo-Han Song 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
We developed and characterized five polymorphic microsatellites of Nilaparvata lugens from hybridization method using biotin enrichment strategy and two polymorphic microsatellites from Next Generation Sequencing. Also 11 microsatellites that developed by Sun et al. (2011) are employed to carry out genetic analysis of N. lugens in Southeast Asia. The number of alleles per locus ranged from 2 to 12 with an average of 4.63 alleles per locus. The mean observed heterozygosity of the eleven populations ranged from 0.031 to 0.938 and the expected hetetrozygosity ranged from 0.031 to 0.881. Signifiant genetic differentiation was detected among the three N. lugens populations as the FST ranged from 0.028 (Cheong Do and Ha Long) to 0.161 (CH and BN). The results of microsatellite marker suggested that found N. lugens migrated to Korea at least two times in different period or once. Genetic distance of N. lugens between Korea and Hi Pong were mostly closed and genetic distance of Ha Long and HCM were relatively closed. In this study, development of microsatellites should facilitate the study of future population genetics of N. lugens, and eventually elucidate the route of N. lugens migration to Korea. Thus, combining satisfactory microsatellite markers and intensive surveillance methods in paddy field could be easy to understand to the N. lugens migration mechanism.
Sujeong Min,Si Woo Lee,Byeong-Ryeol Choi,Chang Gyu Park,Si Hyeock Lee,Deok Ho Kwon 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.10
Nilaparvata lugens Stål is one of the important migratory pests of rice paddy fields in Korea. Resistance levels to nine insecticides were monitored in 12 local strains and correlation analysis was conducted to determine cross-resistance relationships among the tested insecticides. The local strains revealed 1.3- to 28.0-, 1.6- to 6.0-, 2.8- to 237.0-, 0.6- to 0.9-, and 0.7- to 1.3-fold resistance to carbamates, organophosphates, neonicotinoids, fipronil and etofenprox, respectively. Organophosphates revealed moderate correlations with benzofuranyl methylcarbamate (r = 0.566 - 0.614, p > 0.01). Three neonicotinoids were not correlated each other, but imidacloprid and clothianidin were moderately correlated with several benzofuranyl methylcarbamate and organophosphate insecticides (r = 0.590 - 0.705, p > 0.05), indicating that unknown common factors (such as detoxification enzymes) might contribute to resistance to both insecticides. Fipronil and etofenprox exhibited low levels of resistance and cross-resistance with other insecticides, suggesting their potential as an effective insecticide for field application. Resistance level monitoring and correlation analysis would be valuable for the selection of appropriate insecticides to control insecticide-resistant N. lugenes, a typical migratory pest in Korea.
Seol-Hee Moon,Du-Yeol Kim,Jung-Min Lee,Hee-Won Park,Hye-Yeong Lee,Yong-Hoon Lee,Jaesung Lee,Jiwon Jung,Min-Ju Kim,Kyoung-Baek Choi,Yu-Kyoung Oh,Young-Bong Kim,Sujeong Kim,Seung Min Oh 환경독성보건학회 2014 환경독성보건학회지 Vol.29 No.-
Objectives : The sub-acute toxic effects following repetitive intramuscular injection of two cervical cancer vaccines newly developed against human papillomaviruse (HPV)16/58/18 and HPV16 were investigated in female ICR (CrljOri: CD1) mice, and the no-observedadverse-effect-level (NOAEL) of the cervical cancer vaccines was estimated. Methods : Female ICR mice (n=15 in each group) were exposed to a 1:1 mixture of two cervical cancer vaccines by repetitive intramuscular injection (once a week, 5 times) for 5 weeks. Mortality, body weight, organ weight, hematological/biochemical parameters, and histopathological effects were examined at different concentrations (0, 1×10<SUP>8</SUP>, 5×10<SUP>8</SUP>, and 2.5×10<SUP>9</SUP> copies/animal) of the cervical cancer vaccines. Results : The cervical cancer vaccines did not show toxic responses for body weight, absolute/relative organ weight, hematological/biochemical parameters, or histopathological parameters. Conclusions Female ICR mice exposed to vaccines for cervical cancer did not show any toxic response. We suggest that a NOAEL of the vaccine following repetitive intramuscular injection for 5 weeks is >2.5×10<SUP>9</SUP> copies/animal.
Impact of activator type on the immobilisation of lead in fly ash-based geopolymer
Lee, Sujeong,van Riessen, Arie,Chon, Chul-Min,Kang, Nam-Hee,Jou, Hyeong-Tae,Kim, Youn-Joong Elsevier 2016 Journal of hazardous materials Vol.305 No.-
<P><B>Abstract</B></P> <P>Immobilisation of heavy metals in geopolymers has attracted attention as a potential means of treating toxic wastes. Lead is known to be effectively immobilised in a geopolymer matrix, but detailed explanation for the mechanisms involved and the specific chemical form of lead are not fully understood. To reveal the effect of the activator types on the immobilisation of lead in geopolymers, 0.5 and 1.0wt% lead in the form of lead nitrate was mixed with fly ash and alkaline activators. Different alkaline activators (either combined sodium hydroxide and sodium silicate or sodium aluminate) were used to achieve the target Si:Al ratios 2.0 and 5.0 in geopolymers. Zeolite was formed in aluminate-activated geopolymers having a Si:Al ratio of 2.0, but the zeolite crystallization was suppressed as lead content increased. No specific crystalline phase of lead was detected by X-ray diffraction, electron diffraction or FT-IR spectrometry. In fact, double Cs corrected TEM analysis revealed that lead was evenly distributed with no evidence of formation of a specific lead compound. A sequential extraction procedure for fractionation of lead showed that lead did not exist as an exchangeable ion in geopolymers, regardless of activator type used. Aluminate activation is shown to be superior in the immobilisation of lead because about 99% of extracted lead existed in the oxidizing and residual fractions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The type of alkaline activator critically influences the lead immobilisation capability. </LI> <LI> Aluminate-activated geopolymers are more suitable for binding lead in the gel. </LI> <LI> When a greater amount of Al contributes to the localized negative charge the tight lead is more tightly bound. </LI> <LI> Lead disperses randomly forming no specific chemical compound with silicon. </LI> </UL> </P>