Microbiology
Hanieh Bayat; Reza Habibipour; Narges Ghobadi; Fatemeh Golipour
Volume 28, Issue 5 , November and December 2021, , Pages 713-727
Abstract
Introduction: Staphylococcus epidermidis is an opportunistic pathogen and of the most important cause of infectious diseases. The prevalence of these infections, as well as the increase of antibiotic-resistant species, has become a solicitous issue. Using nanoparticles to combat bacterial infections ...
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Introduction: Staphylococcus epidermidis is an opportunistic pathogen and of the most important cause of infectious diseases. The prevalence of these infections, as well as the increase of antibiotic-resistant species, has become a solicitous issue. Using nanoparticles to combat bacterial infections can replace antibiotics. In this study, the antibacterial properties of doped silver nanoparticles on Iron oxide nanocrystal on isolated Staphylococcus epidermidis bacteria from nosocomial infection was studied.
Materials and Methods: Firstly, Nanoparticles were prepared by chemical co-precipitation method and were prepared at concentrations of 0, 20, 40, 60, 80 and 100 ppm to determine bactericidal properties. The effect of nanoparticles on isolated and standard strains of Staphylococcus epidermidis at 24, 48 and 72 hours were investigated by microplate titer. Data were analyzed by SPSS -18 software at a 0.01 margin of error.
Results: The results showed that time, bacterial type and concentration factors had a significant effect on the growth inhibition of Staphylococcus epidermidis, though the concentration and type of bacterial variables had more significant effects. The most antibacterial effect of doped silver nanoparticles on iron oxide nanocrystals was at 100ppm concentration over a 48-hour time on standard isolate.
Conclusion: Doped Silver nanoparticles on Iron nanocrystals affect the growth of Staphylococcus epidermidis and reduce its growth rate. This effect, in comparison to the effects of silver nanoparticles in a single state, which has already been investigated by researchers, is far more advanced and the combination of Metal nanoparticles together cause to improve their effectiveness.
Microbiology
Shima Firozi Rad; Reza Habibipour; Leila Moradi Haghgou
Volume 28, Issue 4 , September and October 2021, , Pages 489-501
Abstract
Introduction: Candida albicans is the most common fungus pathogen in terms of biofilm colonization and formation. Considering that the biofilm-producing Candida species show less sensitivity to anti-fungus medicines, hence the treatment should be accomplished through other anti-fungus factors with high ...
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Introduction: Candida albicans is the most common fungus pathogen in terms of biofilm colonization and formation. Considering that the biofilm-producing Candida species show less sensitivity to anti-fungus medicines, hence the treatment should be accomplished through other anti-fungus factors with high effect and low cytotoxicity. In parallel with this, the present study investigated the C. albicans biofilm formation in the presence of Graphene Dioxide and Reduced Graphene Oxide Nano-sheets. Materials and Methods: Graphene Dioxide and Reduced Graphene Oxide Nano-sheets synthesis were done through the Hummer Method using natural graphite. After 24 hours of incubating of C. albicans with different concentrations of 0, 20, 40, 60, 80, 100 ppm of Nano-sheets, biofilm formation was investigated through the ELISA method, and results were analyzed by SPSS ver.18 software (p <0.01). Results: Graphene Oxide Nano-sheets was more effective to control C. albicans biofilm compared to Reduced Graphene Oxide (p < 0.01). The most effective concentration in biofilm formation was 100 ppm and the best time was 48 and 24 hours for Graphene Oxide and Reduced Graphene Oxide respectively (p < 0.01). Conclusion: According to the obtained results, Graphene Oxide Nano-sheets and Reduced Graphene Oxide can be proposed for further investigations to control Candida albicans.