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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Modern Processes in Manufacturing and Production
- نوع مقاله: Journal Article
- کلمات کلیدی: medium,Biomachining,Acidithiobacillus Ferrooxidans Bacteria
- چکیده:
- چکیده انگلیسی: Recent advances in technology have increased the necessity of using components with Micro and Nano dimensions. In recent years, the use of bacteria as a renewable tool has hopeful applications in producing different work-pieces. In this study, the effect of Acidithiobacillus Ferrooxidans (A.F) on Vt20 (Titanium alloy) and Cu were investigated. The results illustrated that in the medium of the Aerobic bacteria A.F, the layer of TiO2 on the surface of Vt20 is formed and this oxide layer impedes Vt20 corrosion. Furthermore, it was observed that Cu in a medium of A.F is corroded in the same condition. According to these results, biomachining by A.F is considered as a new approach that is used for Micro-Bio grooving on Cu, but this method has different effects on Vt20. So that due to improving the hardness of Vt20 and high resistance of this alloy against abrasion, this method can be used for coating space traveling equipment, automotive industries and home appliance. On the other hand the effect of pH and temperature on Vt20 were studied and it was observed that the increase in pH and temperature improve the resistance of Vt20 against the surface corrosion.
- انتشار مقاله: 14-10-1398
- نویسندگان: Mehrdad Ghani,Hamid Soleimanimehr,Elham Shirani Bidabadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Ethno- Pharmaceutical Products
- نوع مقاله: Journal Article
- کلمات کلیدی: herbal essential oils,GC-Mass,Minimal Inhibitory Concentration,Minimal Bactericide Concentration
- چکیده:
- چکیده انگلیسی: Nowadays, many antibiotics are being used to control infectious diseases. Inappropriate use of antibiotics leads to emergence of resistant bacteria and problems such as a prolonged course of treatment. Medicinal plants and their derivatives, as a good source of treatment, are effective against drug resistance. In this study we have evaluated the antimicrobial activity of herbal essential oils of four medicinal plant Cuminum cyminum, Satureja hotensis L, Citrus limon and Mentha piperita. For preparation of herbal essential oils clevenger apparatus was used, and the active components of the herbal essential oils were determined by GC-MS. In order to observe the effects of the essential oils, they were examined on Staphylococcus aureus, Escherichia coli and Salmonella typhi using disc diffusion method in vitro. Also, the Minimal Inhibitory Concentration (MIC) and Minimal Bactericide Concentration (MBC) of each essential oil was measured and compared with commonly used antibiotics. Obtained results showed that all of the essential oils possess inhibitory and antibacterial effects, but the Mentha piperita essential oil showed a better effect in comparison to other used essential oils. It was concluded that all the herbal species demonstrate antibacterial properties, but the level of bacterial growth inhibition induced by plant materials, shown to be dependent on herbal source and bacterial strain.
- انتشار مقاله: 30-03-1393
- نویسندگان: Sayed Rasoul Zaker,Shahin Gavanji,Sayedeh Sana Sayedipour,Azizollah Bakhtari,Elham Shirani Bidabadi,Behrouz Larki,Zahra Golestannejad
- مشاهده