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닭과 돼지에서 분리한 Campylobacter jejuni 의 동물혈청 및 항균성 물질에 대한 감수성
강호조,이수청 경상대학교 축산진흥연구소 1989 畜産振興硏究所報 Vol.16 No.1
A total of 108 strains of C. jejune isolated from pigs and chickens. were examined for the susceptibility to 10 antimicrobial agents and normal sera of cattle, sheep, guinea pigs and chickens. Minimal inhibitory concentration(MIC) ranges of antimicrobial agents to C. jejune isolates were ≤1.56 to ≥100㎍/ml for erythromycin, rifampin, streptomycin and tetracycline, 50 to ≥ 100㎍ for cephalothin, ≤1.56 to 50㎍ for ampicillin, ≤1.56 to 25 ㎍ for kanamycin and nalidixic acid, ≤1.56 to 12.5 ㎍ for chloramphenicol and gentamicin. Resistance rates of C. jejune were showed to in order of rifampin(84.7%), tetracycline(56.2%), erythromycn(17.1%) and ampicillin(3.8%), all of the strains were sensitive to chloramphenicol, gentamicin and kanamycin, and the incidence rates of resistant C. jejani were highly frequent in pig isolates than chicken isolates. The drug resistance patterns of 87 chicken isolates C. jejuni to 9 antimicrobial drugs were showed 12 patterns, and Sm Ra Tc(24.1%), Sm Ra(21.8%) and Ra Tc(14.9%) were relatively common, and also 21 pig isolates were showed 6 patterns and Em Sm Ra Tc(57.1%) were most frequent. The majority of the isolates showed multiple drug resistance. Bactericidal activity of 10% normal sera from healthy animals were examind for 60min at 37℃. C. jejuni were decreased from 0.4 to 1.0 log_(10)(p$lt;0.01), and serum susceptibility were high in order of guinea pig, sheep, chicken and cattle sera. Serum sensitivity of C. jejuni Ch-39 strain in increased serum concentation up to 10, 20, 40 and 80% were highly significant. In the normal animal serum, the number of Ch-39 strain were decreased from 1.8 × 10⁴/ ml to 2.7 × 10³ / ml after 60 min incubation(p[0.01), but the numbers were decreased to 6.6 × 10³ / ml in the heat inactivated normal serum for 30 min at 56℃. Bactericidal activity was restored in the heat inactivated normal serum after the serum of complement source was added.
가축 유래 staphylococcus aureus의 enterotoxin 산생과 plasmid profile에 관한 연구 II. 분리균주의 enterotoxin 산생
강호조(Ho Jo KANG),최홍근(Hong Geun CHOE),손원근(Won Geun SON),Hideo IGARASHI(五十嵐英夫) 한국예방수의학회 1991 예방수의학회지 Vol.15 No.1
The present study was conducted to investigate the enterotoxin types of Staphylococcus aureus isolated from bulk milk, Korean native cattle, pigs and poultry meat. Enterotoxins were produced by 88.0% of the organisms isolated from bulk milk, 76.2% from cattle, 64.7% from pigs and 22.5% from poultry meat. Enterotoxin type C and D were most common, being 42.0% and 12.8%, respectively. Enterotoxins were produced by all the strains of coagulase types Ⅱ, Ⅲ, Ⅳ and Ⅴ, 94.4% of type Ⅵ and 77.4% of type Ⅶ, while only 36.8% of the mixed type ⅡㆍⅢ produced enterotoxins. Commonly, coagulase types Ⅳ, Ⅴ, Ⅵ and Ⅶ strins produced enterotoxin C, and coagulase typis Ⅱ and ㆍⅢ strains produced enterotoxin D.
가축 유래 staphylococcus aureus의 enterotoxin 산생과 plasmid profile에 관한 연구 V. R-plasmid의 분리 및 전이
강호조(Ho Jo Kang),김용환(Young Hwan Kim),손원근(Won Geun Son),강광식(Gwang Sig Kang),이제용(Je Young Lee) 한국예방수의학회 1992 예방수의학회지 Vol.16 No.1
Animal source strains of Staphylococcus aureus were studies for the profiles of plasmids and the transfer of resistance plasmid by conjugation. A total of 50 isolates of S. aureus were subjected to the test for the presence of plasmid DNA. The isolates of bulk milk, chicken and Pig origin had 1 to 5 plasmid element. The plasmids recovered from these organisms had molecular weight ranging from 1.3 to 63 kb, 0.94 to 63 kb and 1.1 to 44 kb, respectively. In the strains isolated from bulk milk, the majority of the isolated plasmids was large molecular weight and they had one plasmid element. On the other hand, small molecular weight plasmids were predominant and they had multiple plasmid element in the isolates of chicken origin. Tetracycline and gentamicin resistant plasmid of S. aureus were transferable between S. aureus by filter mating method, but in the broth mating method were not transferable plasmids. The frequencies of tetracycline plasmid transfer between S. aureus strains were 2.0-5.2×10⁻⁷, and gentamicin plasmids transfer were 1.2×10⁻⁸.