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Weissella cibaria CMU 경구투여가 비글의 구취 저하에 미치는 효과
도경효,박호은,강미선,김종태,여지은,이완규,Do, Kyung-Hyo,Park, Ho-Eun,Kang, Mi-Sun,Kim, Jong-Tae,Yeu, Ji-Eun,Lee, Wan-Kyu 대한수의학회 2018 大韓獸醫學會誌 Vol.58 No.2
This study assessed the effects of Weissella cibaria (W. cibaria) CMU on oral health in male and female beagles (n = 18) by measuring oral malodor and periodontal disease-related parameters (calculus, plaque, and gingivitis indices). Oral malodor and indicators of periodontal disease were assessed in five treatment groups: negative control (scaling and 0.24 mg of maltodextrin, n = 3), positive control (0.24 mg of maltodextrin, n = 3), and W. cibaria CMU groups (each n = 4) at low (CMU-L, $2{\times}10^7$ colony forming unit [CFU]), medium (CMU-M, $2{\times}10^8CFU$), and high (CMU-H, $2{\times}10^9CFU$) concentrations. After feeding with W. cibaria CMU for 6 weeks, total volatile sulfur compound concentrations in the CMU-L ($2.0{\pm}1.04ng/10mL$), CMU-M ($2.4{\pm}1.05ng/10mL$), and CMU-H ($2.6{\pm}1.33ng/10mL$) groups were significantly lower than in the positive control group ($3.2{\pm}1.65ng/10mL$). Also, CMU-L ($1.4{\pm}0.83ng/10mL$) and CMU-H ($1.9{\pm}1.14ng/10mL$) groups had methyl mercaptan levels lower than that in the positive control group ($2.4{\pm}1.21ng/10mL$) at week 2. The plaque index was significantly lower in the CMU-H group ($4.5{\pm}0.28$) than in the positive control group ($5.9{\pm}1.08$) at week 6. W. cibaria CMU could be useful as a novel oral hygiene probiotics for reducing volatile sulfur compounds production and inhibiting plaque growth in companion animals.
사료 첨가 항생제 금지 전후 돼지 설사증 유래 대장균의 병원성 인자 및 항생제 내성 유전자
도경효,변재원,이완규,Do, Kyung-Hyo,Byun, Jae-Won,Lee, Wan-Kyu 대한수의학회 2020 大韓獸醫學會誌 Vol.60 No.3
This study examined the prevalence of adherence factors, toxin genes, antimicrobial resistance phenotypes, and resistance genes in Escherichia coli (E. coli) isolated from piglets with diarrhea before and after the ban on antibiotic growth promoters (AGPs) in Korea from 2007 to 2018. In this period, pathogenic 474 E. coli isolates were obtained from diarrheic piglets. The virulence factors and antimicrobial resistance genes were assayed using a polymerase chain reaction, and the susceptibility to antibiotics was tested according to the Clinical and Laboratory Standards Institute guidelines. After the ban on AGPs, the frequency of F4 (12.5% to 32.7%) increased significantly, and LT (31.9% to 20.3%) and EAST-I (46.5% to 35.2%) decreased significantly. In addition, the resistance to streptomycin (45.8% to 67.9%), cephalothin (34.0% to 59.4%), and cefazlin (10.4% to 28.8%) increased significantly. Colistin resistance plasmid-mediated genes, mcr-1 and mcr-3, were detected after the ban on AGPs. The results of this study can provide useful data for analyzing the impact of the ban on AGPs on the virulence profiles and antimicrobial resistance of E. coli isolated from piglets with diarrhea in Korea.
NiFe2O4의 수소환원에 의한 나노구조 Fe-Ni 합금의 제조 및 자성특성
박종진 ( Jong Jin Pak ),백민규 ( Min Kyu Paek ),도경효 ( Kyung Hyo Do ),( Mohamed Bahgat ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.1
Nickel ferrite (NiFe2O4) powder was prepared through the ceramic route by calcination of a stoichiometric mixture of nickel oxide (NiO) and iron oxide (Fe2O3). The pressed pellets of NiFe2O4 were isothermally reduced in pure hydrogen at 800, 900, 1000 and 1100℃. Based on thermogravimetric analysis, the reduction behavior and the kinetic reaction mechanisms of the synthesized ferrite were studied. The initial ferrite powder and various reduction products were characterized by XRD, SEM, reflected light microscope and VSM to reveal the effect of hydrogen reduction on the composition, microstructure, magnetic properties and reaction kinetics of the produced Fe-Ni alloy. Complete reduction of the NiFe2O4 was achieved with synthesis of homogeneous nanocrystalline Fe-Ni alloys. Arrhenius equation with the approved mathematical formulations for a gas-solid reaction was applied for calculating the activation energy (Ea) values and detecting the controlling reaction mechanism.
Ni0.5Co0.5Fe2O4의 수소환원에 의한 나노구조 Fe-Ni-Co 합금의 제조 및 자성특성
박종진 ( Jong Jin Pak ),백민규 ( Min Kyu Paek ),( Mohamed Bahgat ),도경효 ( Kyung Hyo Do ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.2
Nickel cobalt ferrite(Ni0.5Co0.5Fe2O4) powder was prepared through the ceramic route by the calcination of a stoichiometric mixture of NiO, CoO and Fe2O3 at 1100℃. The pressed pellets of Ni0.5Co0.5Fe2O4 were isothermally reduced in pure hydrogen at 800~1100℃. Based on the thermogravimetric analysis, the reduction behavior and the kinetic reaction mechanisms of the synthesized ferrite were studied. The initial ferrite powder and the various reduction products were characterized by X-ray diffraction, scanning electron microscopy, reflected light microscope and vibrating sample magnetometer to reveal the effect of hydrogen reduction on the composition, microstructure and magnetic properties of the produced Fe-Ni-Co alloy. The arrhenius equation with the approved mathematical formulations for the gas solid reaction was applied to calculate the activation energy(Ea) and detect the controlling reaction mechanisms. In the initial stage of hydrogen reduction, the reduction rate was controlled by the gas diffusion and the interfacial chemical reaction. However, in later stages, the rate was controlled by the interfacial chemical reaction. The nature of the hydrogen reduction and the magnetic property changes for nickel cobalt ferrite were compared with the previous result for nickel ferrite. The microstructural development of the synthesized Fe-Ni-Co alloy with an increase in the reduction temperature improved its soft magnetic properties by increasing the saturation magnetization(Ms) and by decreasing the coercivity(Hc). The Fe-Ni-Co alloy showed higher saturation magnetization compared to Fe-Ni alloy.