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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Biotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Pseudomonas aeruginosa,Production,Nitrile,Nitrilase,Nitrile-degrading bacteria,Sewage
- چکیده:
- چکیده انگلیسی: Background: The conversion of nitriles into amides or carboxylic acids by nitrilase has taken its application into consideration, as the scope of its applications has recently been extended. Objectives: In this study, P. aeruginosa RZ44 was isolated from sewage in the Kerman which has Nitrile-degradation activity. In order to improve the nitrilase production, several optimization were done on environmental condition. Nitrilase activity was characterized against different pHs, temperatures, ions, and substrates. Materials and Methods: Enzyme activity was evaluated by determining the production of ammonia following to the modification of the phenol/hypochlorite method. Different factors that affect production of the enzyme by P. aeruginosa RZ44 were optimized and evaluated in the culture mediums. Results: The results showed that degradation of the acetonitrile by P. aeruginosa RZ44 increased the pH of the growth medium from the initial pH 7.0 to 9.37. Optimizing the medium for P. aeruginosa RZ44, it was found that glucose and starch (5 g.L-1) have strongly supported nitrilase production, compared to the control. As well, urea (5 g.L-1) and yeast extract (15 g.L-1) have favored an increased biomass and nitrilase production, as the nitrogen sources. These results show that nitrilase production increases in the pH range 5.0 to 7.0 and then start decreasing. Addition of the Mg2+, Fe2+ and Na+ has supported the biomass and nitrilase production. Co2+, Mn2+ and Cu2+ were confirmed to inhibit cell growth and enzyme production. Enzyme characterization results show that, P. aeruginosa RZ44 nitrilase exhibits comparatively high activity and stability at pH 7.0 and 40°C. Nitrilase was completely inhibited by CoCl2 and CaCl2, whereas, the inhibition in the presence of MnSO4 and CuSO4 was about 60%. Time course analysis of the nitrile conversion by the resting P. aeruginosa RZ44 cells showed that nitrile substrates (i.e. acetonitrile) was hydrolyzed within 8 h. Conclusions: these results indicate that P. aeruginosa RZ44 has the potential to be applied in the biotransformation of nitrile compounds.
- انتشار مقاله: 21-12-1393
- نویسندگان: Arastoo Badoei-dalfard,Narjes Ramezani-pour,Zahra Karami
- مشاهده
- جایگاه : پژوهشی
- مجله: Addiction and Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Methadone,drugs,Hepatitis C Virus,Iran,treatment
- چکیده:
- چکیده انگلیسی: Background: Untreated Hepatitis C Virus (HCV) has been reported among many Iranian female methadone patients. However, few of them report receiving HCV treatment. The present study is the first research from western Asia that explored the barriers to receiving HCV treatment among a group of Iranian female HCV-infected methadone patients.Methods: This qualitative study was conducted in four main methadone treatment clinics in Tehran, Iran, in November 2016. Overall, fifty-six untreated HCV-infected women and eight clinicians from HCV and methadone treatment services were interviewed. Women either had not received HCV treatment or received HCV treatment but left it. Data were analyzed using NVivo software. This was based on the grounded theory of Strauss and Corbin.Findings: Barriers to receiving HCV treatment included factors related to individuals and factors related to the system. Individual factors included the perception that untreated HCV infection was not a serious health concern, family responsibilities, and self-perceived discrimination against HCV-infected women. System-related factors included the lack of referral from methadone treatment staff, and a long distance between HCV treatment centers and methadone treatment centers. Interviews with the health professionals also confirmed the women’ self-reports.Conclusion: The results of this research confirm the necessity of providing HCV education and the delivery of comprehensive care for this group in methadone treatment clinics. Other services such as staff education and HCV treatment services at methadone treatment centers are suggested.
- انتشار مقاله: 05-12-1396
- نویسندگان: Omid Massah,Mohammad Effatpanah,Afsaneh Moradi,Mohammad Salehi,Ali Farhoudian,Zahra Karami
- مشاهده