نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، گروه زیست‌شناسی، دانشگاه پیام نور، ایران

2 دانشیار، گروه زیست‌شناسی، دانشگاه پیام نور، ایران

3 استادیار، گروه زیست‌شناسی، دانشگاه پیام نور، ایران

10.30468/jsums.2024.7644.2970

چکیده

زمینه و هدف: یکی از بهترین راهکارها برای حذف فلزات سمی، استفاده از باکتری‌های مقاوم به این فلزات با فرایند پاک‌سازی زیستی می‌باشد. هدف از این پژوهش، جداسازی باکتری‌های مقاوم به قلع، مس، کروم و نیکل از پساب‌های صنعتی و شناسایی مولکولی آنها می‌باشد.
مواد و روش­ها: ابتدا از کارخانه‌های آبکاری واقع در استان تهران، پساب آلوده به فلزات سنگین جمع‌آوری گردید. نمونه پساب بر روی محیط LB Agar حاوی غلظت‌های مشخص از فلزات سنگین کشت داده و باکتری‌های رشدیافته جداسازی گردید. بر روی باکتری‌های رشدیافته، حداقل غلظت مهارکننده رشد (MIC) فلزات سنگین با روش میکروبراث دایلوشن انجام شد. DNA ژنومی دوسویه با بالاترین میزان مقاومت، تخلیص و PCR با کمک پرایمرهای اختصاصی انجام شد. محصول PCR تعیین سکانس شد و ریبوتایپینگ انجام گردید.
یافته­ ها: از پساب حاوی فلزات سنگین،  تعداد 9 باسیل گرم مثبت و منفی و کوکوباسیل گرم منفی جداسازی گردیدند. دوسویه باسیل گرم منفی، بیشترین مقاومت نسبت به فلزات سنگین را در آزمایش MIC از خود نشان دادند. این دوسویه بر اساس نتایج تعیین توالی، تحت عناوین انتروباکتر و سودوموناس شناسایی گردیدند.
نتیجه‌گیری: دوسویه با بالاترین مقاومت به چهار فلز از پساب کارخانجات آبکاری جدا شدند و به روش ارزیابی فیلوژنتیک مورد شناسایی مولکولی قرار گرفتند. می‌توان از این باکتری‌ها در تصفیه زیستی پساب‌های حاوی فلزات سنگین استفاده کرد.

تازه های تحقیق

https://scholar.google.com/citations?view_op=new_profile&hl=en

https://pubmed.ncbi.nlm.nih.gov/?term=Mahta+Majdnia&sort=date

https://scholar.google.com/citations?user=xp2DXosAAAAJ&hl=en

https://pubmed.ncbi.nlm.nih.gov/?term=Maryam+Sadrnia&sort=date

https://scholar.google.com/citations?hl=en&user=GOPrr8oAAAAJ

https://pubmed.ncbi.nlm.nih.gov/?term=Fatemeh+Shahbazi&sort=date

https://pubmed.ncbi.nlm.nih.gov/?term=Nooshin+Sohrabi&sort=date

 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Isolation of Heavy Metal Resistant Bacteria from Industrial Effluents and Molecular Ribotyping

نویسندگان [English]

  • Mahta Majdnia 1
  • Maryam Sadrnia 2
  • Fatemeh Shahbazi 2
  • Nooshin Sohrabi 3

1 Master In Sciences,, PayameNoor University, Iran

2 Associated Professor, Payame noor University, Iran

3 Assistant Professor, Department of Biology, PayameNoor University, Iran

چکیده [English]

Introduction: One of the best ways to remove toxic metals is to use bacteria resistant to these metals with a biological purification process. This research aims to isolate bacteria resistant to tin, copper, chromium, and nickel from industrial wastewater and their molecular identification.
Materials and Methods: wastewater contaminated with heavy metals was collected from electroplating factories located in Tehran province. The wastewater sample was cultured on LB Agar containing certain concentrations of heavy metals and the grown bacteria were isolated. In the grown bacteria, the minimum growth inhibitory concentration (MIC) of heavy metals was determined by the microbroth dilution method. The genomic DNA of two strains with the highest level of resistance, purity, and polymerase chain reaction was performed with the help of specific primers. The PCR product was sequenced and ribotyping was done.
Results: 9 gram-positive and negative bacilli and gram-negative coccobacilli were isolated from wastewater containing heavy metals. Two Gram-negative bacillus strains showed the highest resistance to heavy metals in the MIC test. Based on the sequencing results, these two strains were identified as Enterobacter and Pseudomonas.
Conclusion: Two strains with the highest resistance to four metals were isolated from the effluent of electroplating factories and phylogenetic evaluation was performed. These bacteria can be used in the biological treatment of wastewater containing heavy metals.

کلیدواژه‌ها [English]

  • heavy metals
  • bacteria
  • metal resistance
  • molecular identification
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