Biotechnology & nanotechnology
Mahta Majdnia; Maryam Sadrnia; Fatemeh Shahbazi; Nooshin Sohrabi
Abstract
Introduction: One of the best ways to remove toxic metals is to use bacteria resistant to these metals with biological purification process. The aim of this research is to isolate bacteria resistant to tin, copper, chromium and nickel from industrial wastewater and their molecular identification.
Materials ...
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Introduction: One of the best ways to remove toxic metals is to use bacteria resistant to these metals with biological purification process. The aim of this research is to isolate bacteria resistant to tin, copper, chromium and nickel from industrial wastewater and their molecular identification.
Materials and methods: First, 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. On the grown bacteria, the minimum growth inhibitory concentration (MIC) of heavy metals was determined by the microbroth dilution method. 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.
Biotechnology & nanotechnology
Saeid Mirzaei; Malek Hossein Asadi; Pegah Hejazi; Babak Taghipour
Volume 27, Issue 6 , January and February 2021, , Pages 754-759
Abstract
Introduction: Stomach cancer and breast cancer are most common cancers in the world and in Iran. Today, the use of fungal and bacterial extractions has been interesting to cancer researchers. Rhizobium is a highly beneficial bacteria in agriculture and environment that provides the nitrogen needed for ...
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Introduction: Stomach cancer and breast cancer are most common cancers in the world and in Iran. Today, the use of fungal and bacterial extractions has been interesting to cancer researchers. Rhizobium is a highly beneficial bacteria in agriculture and environment that provides the nitrogen needed for Legume family plants through coexistence with this family. Materials and Methods: In this study, the effect of Bradyrhizobium cell extraction and its mutated type on the cancer of breast (MCF7) and stomach (AGS) was investigated. Material and Methods: Cytotoxicity effect of different concentration of Bradyrhizobium japonicum biomass and extract on stomach and breast cancer cells was investigated using MTT colorimetric method. Data analysis were conducted using Graphpad Prism 6.0 software and ANOVA method. Results: The findings showed that both wild type and mutant type of bacteria had a significant meaningful effect on both types of cancer cells and their cytotoxicity was dependent on the concentration of extract or biomass (the lowest rate was observed at a concentration of 30 and at most 480 Micrograms per ml). In most cases biomass showed a better effect than extract. Conclusion: In general, this study showed the effect of extract and biomass of Bradyrhizobium bacteria cytotoxicity on cancer cells, which could be used as a source for antineoplastic agent.
Microbiology
Behnam Hashemi; saeid taghiloo; Esmaeil allahmoradi; Morteza Karami; Hossein ali Rahdar
Volume 25, Issue 3 , July and August 2018, , Pages 303-308
Abstract
AbstractIntroduction: Portulaca oleracea is one of the most utilized herbs in the world. According to some antibacterial effect of plants extracts, it seems that this extracts can be used in the bacterial infection treatments. In order to assessment of antibacterial effect of the Portulaca oleracea extract, ...
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AbstractIntroduction: Portulaca oleracea is one of the most utilized herbs in the world. According to some antibacterial effect of plants extracts, it seems that this extracts can be used in the bacterial infection treatments. In order to assessment of antibacterial effect of the Portulaca oleracea extract, we determined minimum inhibitory and minimum bactericidal concentration of the Portulaca oleracea extract on the pathogenic bacterial species that antibiotic resistant pattern was determined in this species.Methods: Hydro-Alcoholic extract of the Portulaca oleracea was harvested. Bacterial species including S. aureus, P. aeruginosa, L. monocytogenes, A. baumannii, E. coli and K. pneumonia was collected from the Iran pasteur institute. Antibiogram was determined by disk diffusion method and then MIC and MBC of Hydro-Alcoholic extract of the Portulaca oleracea was determined.Results: Highest MIC concentration was observed in P. aeruginosa, L. monocytogenes, E. coli and K. pneumonia. While highest MBC concentration related to L. monocytogenes.Conclusion: Herbal antibacterial extracts can be useful in human infection control. In order to this goal, in this study antibacterial effect of Portulaca oleracea extract determined against six important pathogens. According to Our results hydro-alcoholic extract of Portulaca oleracea show antibacterial effect on human pathogens including E. coli, K. pneumonia, S. aureus, A. baumannii, P. aeruginosa and L. monocytogenes.