RESUMO
Objective To research the resistibility of microbes contaminated in cosmetics to preservatives in common use in cosmetics.Methods The minimum inhibitory concentration(MIC) method was used according to Disinfection Technical Guideline.Results The resuls showed that some of the isolated microbes had higher resistance for one or more of the commonly used preservatives.The MIC of enterobacter gergoviae for methyl paraben was 10 mg/ml,the MIC of paecilomyces for propyl paraben was 10 mg/ml,it was 2.5 times greater than the limited dose.The MIC of Pantoea,P.luteola and trichoderma for imidazolidinyl urea were higher than other standard microbe strains.Conclusion The microbes contaminated in cosmetics can develop tolerance to the preservatives in common use in cosmetics,maybe that is one of the causes for cosmetics contamination.
RESUMO
Objective To induce vancomycin-resistantant S.aureus in vitro and to observe the changes of coagulase gene sequences of S.aureus and its relationship with vancomycin resistance.Methods DNA sequences of the coagulase were examined by polymerase chain reaction-sigle strand conformation polymorphism(PCR-SSCP) method and were identified by sequencing.Results The altered DNA sequence of coagulase in 1 strain of S.aureus was found.Conclusion The variation of DNA sequences of coagulase gene is probably linked to vancomycin-resistance in S.aureus.
RESUMO
Objective To observe the changes of coagulase activity and the DNA expression of coagulase of S.aureus during inducing vancomycin-resistant S.aureus in vitro.Methods Coagulase activity and DNA expression of coagulase of S.aureus were detected.Results The coagulase activity in 6 strains and the expression of coagulase DNA in 1 strain reduced.Conclusion Decreased coagulase activity and DNA expression are probably linked to vancomycin resistance of S.aureus.