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설사자돈(泄瀉子豚) 유래(由來) 대장균(大腸菌)의 항생물질(抗生物質) 내성(耐性)에 관(關)하여
조광현 ( Kwang Hyon Cho ),박노찬 ( No Chan Park ),권헌일 ( Hun Ill Keun ),김이준 ( Lee Zun Kim ),박덕상 ( Duk Sang Park ) 한국동물위생학회 1992 한국동물위생학회지 (KOJVS) Vol.15 No.2
The present study was conducted to investigate the biochemical characteristics and antibiotic resistance of pathogenic Escherichia coli(E. coli) isolated from piglets with diarrhea in Kyongbuk province during the period from February to November 1991. 368 E. coli strains were isolated from 382 piglets with diarrhea and the biochemical and cultural reaction were compared with the classification criteria of Edwards and Ewing. Tetracycline and sulfadimethoxine were found to be highly ineffective at in vitro inhibition of the E. coli of piglets origin. The majority of E. coli were susceptible to amikacin, chloramphenicol and gentamicine. 89(89.0%) of 100 strains of E. coil were resistant to one or more drugs. The organisms resistant to 20 or 3 drugs were 54(60.6%) of 89 strains, whereas 16(17.9%) strains were found to be resistant to one drug. 55(61.8%) out of 89 drug resistance strains carried R factors(R+) which were transferable to the recipients by conjugation.
Z-Type 바리움 페라이트 분말의 연자성 특성에 미치는 Ba 및 Fe 농도의 영향
조광묵(Kwang Muk Cho),남인탁(In Tak Nam) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.1
Z-type barium ferrite [(Ba<SUB>3</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24</SUB>O<SUB>41</SUB>, Ba<SUB>3 + δ</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24</SUB>O<SUB>41</SUB> δ = 3, 5, 7, 13 wt%. Ba<SUB>3</SUB>Co<SUB>0.8</SUB>Zn<SUB>1.2</SUB>Fe<SUB>24 + δ</SUB>O<SUB>41</SUB> δ = 5, 7, 10 wt% )] were synthesized using co-precipitation method. The microstructure and magnetic properties of synthesized particles were investigated. In all prepared particles M-type Ba ferrite is identified with Z-type Ba ferrite together. It is found that particles having 7 wt% for Ba and 5 wt% for Fe excess addition revealed high saturation magnetization, respectively. All synthesized particles showed relatively high coercivity for device application. This result may be attributed to the contribution of M-type Ba ferrite. Ba and Fe excess addition was not affected to the structural change of CoZnZ Ba ferrite. The certain amount of excess additions of Ba and Fe and the 2 step heat-treatment may be beneficial to the improvement of soft magnetic properties of Z-type barium hexa-ferrite.
호흡기질병 감염 송아지에서 분리한 Pasteurella haemolytica의 생화학적 특성 및 약제 감수성
조광현 ( Kwang Hyon Cho ),박노찬 ( No Chan Park ),권헌일 ( Hun Ill Keun ),김이준 ( Lee Zun Kim ),박덕상 ( Duk Sang Park ) 한국동물위생학회 1991 한국동물위생학회지 (KOJVS) Vol.14 No.2
The present study was conducted to investigate biochemical properties and antimicrobial drug susceptibilities of 36 strains of Pasleurella haemolytica(P haemolylica) isolated from pneumonic calves in Kyongbuk province during the period from January 1990 to December 1990. P haemolytica was isolated from 36 of 111(32.4%) pneumonic calves of 1 to 6 months of age. The majority of biochemical and cultural properties of P haemolylica isolated from calves were identical to those of the reference strains employed. All isolated were susceptible to baytril, gentamicin, and kanamycin, some of them were resistant to tetracycline, amikacin, streptomycin, and ampicillin.
조광현 ( Kwang Hyun Cho ),박인화 ( In Hwa Park ),도재철 ( Jae Cheul Do ),장성준 ( Sung Jun Chang ),박노찬 ( No Chan Park ),권헌일 ( Huon Il Kwon ),박덕상 ( Duk Sang Park ) 한국동물위생학회 1996 한국동물위생학회지 (KOJVS) Vol.19 No.2
Lungs from 109 slaughter pigs with gross lesions indicating enzootic Pneumonia of pigs(EPP) and 16 grossly normal lungs, all originating from seven different herds, were subjected to microbiological examinations. The microbiological studies were included both bacterial and mycoplasmal culture. From lungs of 125 slaughter pigs, 87.2% pigs were pneumonia lesions alone or complexly. Mycoplasma spp., pasteurella multocida (P. multocida), Streptococcus spp., and Actinobacillus pleuropneumoniae(A. pleuropneumoniae) were detected in 39.4%, 42.2%, 13.8%, and 3.7% of the pneumonic lungs, respectively. P. multocida was the most frequently isolated organism in pneumonic lungs. Mycoplasmas not isolated organism in 33.9% the pneumonic lungs even if there are gross lessions mycoplasmas. The amounts of pneumonia in lungs with Mycoplasma spp. alone, a concurrence of Mvcoplasma spp. and P. multocida, P. multocida alone, a concurrence of P. multocida and A. pleuropneumoniae, and a concurrence of Mycoplasma spp. and A. pleuropneumoniae were 10.1%, 22.7%, 18.7%, 25%, and 30%, respectively. These findings indicated that P. multocida might be involved in the pathogenesis of pneumonia in slaughter pigs. Mycoplasma spp. was also, in this study, associated with higher frequency of pneumonia. The frequency of pigs snout lesion grade 0~5 inclusive were 27.2%, 28%, 19.2%, 16%, 6.4%, and 3.2% from 125 slaughter pigs. 32(25.6%) pigs were positive and 13~30% in the pigs from seven herds were found to be infected with atrophic rhintis(AR). A total of 46 P. multocida strains in pneumonic lungs were further characterized by capsular serotyping and testing for production of dermonecrotic toxin. 42(91.3%) of strains were capsular A and 4(8.7%) were type D. Out of the type A and type D strains, 86% and 75% were toxigenic, respectively.