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Karol Fijałkowski,Magdalena Struk,Jolanta Karakulska,Aleksandra Paszkowska,Stefania Giedrys-Kalemba,Helena Masiuk,Danuta Czernomysy-Furowicz,Paweł Nawrotek 한국미생물학회 2014 The journal of microbiology Vol.52 No.5
The purpose of this study was to analyze and compare genesencoding superantigens (SAgs) in Staphylococcus xylosus andStaphylococcus aureus isolates collected simultaneously frommilk of the same cows with clinical mastitis. Genes encodingstaphylococcal enterotoxins and enterotoxin-like proteins(sea-selu), toxic shock syndrome toxin 1 (tst-1) and exfoliativetoxins (eta and etd) were investigated. It was found thatamong 30 isolates of S. xylosus, 16 (53.3%) harbored from 1to 10 SAg genes. In total, in 16 SAg positive S. xylosus, 11different enterotoxin genes were detected: sec, sed, seg, seh,sei, selm, seln, selo, selp, ser, selu and one etd gene encodingexfoliative toxin D. The most prevalent genes were ser, selu,and selo. Among all the positive isolates of S. xylosus, a totalof 14 different SAg gene combinations were detected. Onecombination was repeated in 3 isolates, whereas the rest weredetected only once. However, in the case of S. aureus all the30 isolates harbored the same combination of SAg genes:seg, sei, selm, seln, selo and on the basis of PFGE analysis allbelonged to the same clonal type. Also noteworthy was theobservation that SAg genes detected in S. aureus have alsobeen found in S. xylosus. The findings of this study furtherextend previous observations that SAg genes are presentnot only in S. aureus but also in coagulase-negative staphylococci,including S. xylosus. Therefore, taking into accountthat the SAg genes are encoded on mobile genetic elementsit is possible that these genes can be transferred betweendifferent species of coexisting staphylococci.
Karol Fija kowski,Pawe Nawrotek,Magdalena Struk,Marian Kordas,Rafa Rakoczy 한국자기학회 2013 Journal of Magnetics Vol.18 No.3
This work presents results of the study which concerns the influence of the rotating magnetic field (RMF) on the growth rate, cell metabolic activity and ability to form biofilms by E. coli and S. aureus. Liquid cultures of the bacteria were exposed to the RMF (RMF frequency f = 1-50 Hz, RMF magnetic induction B = 22-34 mT, time of exposure t = 60 min, temperature of incubation 37℃). The present study indicate the exposition to the RMF, as compared to the unexposed controls causing an increase in the growth dynamics, cell metabolic activities and percentage of biofilm-forming bacteria, in both S. aureus and E. coli cultures. It was also found that the stimulating effects of the RMF exposition enhanced with its increasing frequencies and magnetic inductions.