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Estimating Predicted Environmental Concentration of Veterinary Antibiotics in Manure and Soil
Kwon, A-Young,Kim, Sung Chul 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.2
Adverse effect of veterinary antibiotics (VAs) released into environment has been issued recently and concerns about analysis and management for VAs in the environment were increased. Main objective of this research was to calculate predicted environmental concentration (PEC) of the VAs in soil based on avaiable statistical data and result of previous study such as consumption rate and physiological properties of VAs. Total of 5 VAs, Chlortetracycline (CTC), Oxytetracycline (OTC), Sulfadimethoxine (SDX), Sulfamethazine (SMT), and Tylosin (TYL) were examined. Result showed that calculated PEC value in manure and soil was ordered as SMT > TYL > SDX > CTC > OTC. Range of calculated value for manure and soil was 0.50-67.04 and $0.48-64.45mg\;kg^{-1}$ respectively. Comparing to measured concentration of VAs in manure and soil, lower concentration of VAs in manure and soil was evaluated due to fate and degradation of VAs in manure and soil. Overall, evaluated simple modeling for calculating PEC of VAs in manure and soil can be adapted for preliminary screening purpose in environmental risk assessment and more refined modeling is necessary to examine detailed assessment of VAs in manure and soil.
Kwon, Dong-Yeul,Kang, Ok Hwa,Choi, Jang-Gi,Lee, Young-Seob,Oh, Yoo-Chang,Chae, Hee-Sung,Lee, Go-Hoon,Park, Pil-Sang,Kim, Youn-Chul,Sohn, Dong Hwan,Park, Hyun,Lee, John Hwa INVERNI DELLA BEFFA 2007 Fitoterapia Vol.78 No.6
<P><B>Abstract</B></P><P>Methanol extract and its fractions (hexane, EtOAc, <I>n</I>-BuOH, and H<SUB>2</SUB>O) of <I>Dryopteris crassirhizoma</I> were investigated for antibacterial activity against methicillin-resistant <I>Staphylococcus aureus.</I> The hexane fraction showed a good antibacterial activity against all tested strains.</P>
Thermal and mechanical behaviors of Cu–Zr amorphous alloys
Kwon, Oh-Jib,Lee, Young-Kook,Park, Sang-Ok,Lee, Jae-Chul,Kim, Yu-Chan,Fleury, Eric Elsevier Sequoia 2007 Materials science & engineering Structural materia Vol.449 No.-
<P><B>Abstract</B></P><P>The thermal and mechanical properties of 1mm diameter rod specimens were investigated over a wide composition range of the Cu–Zr binary alloy system. Our results indicated that alloys with composition near Cu–36at.% Zr have a higher activation energy and a lower plastic deformation during compression test than those of compositions near Cu–50at.% Zr. A relationship between the activation energy and the plastic deformation could be worked out suggesting that the lower is the activation energy to crystallization, the larger is the plastic deformation.</P>
Electric Deformation of a Bubble in a Uniform Electric Field
Kwon, Young Chul,Kwon, Jeong Tae,Cho, Hye Jung,Kim, Dae Hoon,Lee, Sang Heon 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.3
Theoretical and numerical analyses have been carried out to investigate the electric deformation of a spherical free bubble in a uniform electric field. In the limit of small deformation, the steady-state deformation of a free bubble in an electric field has been considered. The electric field strength and the electric normal stress at the bubble interface and free energy and volume change of a bubble have been investigated. In addition. the bubble shape and the electric potential in an electric field have been calculated numerically. The boundary-fitted orthogonal coordinate system generated numerically has been employed. The electric normal stress is the largest at the equator (θ = π /2) of the bubble. causing the spherical bubble to deform into an elliptical one. As the electric Weber number increases, the bubble volume decreases linearly. The numerical results also show that the bubble is elongated and becomes more extended as the electric field strength increases. The aspect ratio increases upon increasing the electric Weber number.