Parastoo Pourali Articles List

List of Articles Parastoo Pourali

Open Access Article
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1 - Biological production and assessment of the antibacterial activity of gold nanoaprticles
Parastoo Pourali Majid Baseri Salehi Sima Afsharnejad Javad Behravan

Background and Objectives: In addition to safety, nanoparticles produced via biological methods show antimicrobial activity against human pathogens. This study was aimed to isolation and identification of intracellular and extracellular gold nanoparticle producing strai More

Background and Objectives: In addition to safety, nanoparticles produced via biological methods show antimicrobial activity against human pathogens. This study was aimed to isolation and identification of intracellular and extracellular gold nanoparticle producing strains from soil and to investigate the antimicrobial effects of the produced nanoparticles on 10 common bacterial pathogens. Materials and Methods: In this study, after isolation of bacteria from the soil and production of the gold nanaoparticles by their supernatants and their pure cells, the bio-production was confirmed through visible spectrophotometry, transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). The nanoparticle producing stains were identified based on gene amplification by PCR and gene sequencing. Finally, the antibacterial properties of the produced gold nanoaprticles against 10 pathogenic bacteria was assessed by well diffusion method. Results: Results showed that 38 strains had ability to produce extracellular gold nanoparticles. Among them 16 strains had ability to produce intracellular gold nanoparticles as well. TEM images of the gold nanoparticles showed sizes less than 100 nm and the XRD patterns confirmed the crystalline structure of the gold nanoparticles. Three bacterial strains, Bacillus mojavensis, Bacillus subtilis and Bacillus vallismortis, showed higher productivity. Antibacterial tests showed that the extracellular gold nanoaprticles had better activity against pathogenic bacterial strains than the intracellular produced ones. Conclusion: Production of gold nanoparticles was performed by biological method. This nanoparticles showed a same antibacterial activity against both tested gram positive and negative bacteria. Manuscript profile
Open Access Article
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2 - Production of cellulose from native bacterial isolates isolated in Iran
Raheleh Taheri Hatef Ajudanifar Parastoo Pourali

Background and Objectives: The microbial cellulose which is produced by some strains of Acetobacter and Gluconobacter is structurally similar to plant cellulose. Based on this feature, the microbial cellulose has been used in medical and industrial productions as an imp More

Background and Objectives: The microbial cellulose which is produced by some strains of Acetobacter and Gluconobacter is structurally similar to plant cellulose. Based on this feature, the microbial cellulose has been used in medical and industrial productions as an important raw material. The aims of this study were to isolate the native bacteria species producing cellulose and to evaluate their production rate. Materials and Methods: In this study, 65 samples were collected from different types of local vinegars, juices and fruits and were cultivated in Hestrin-Schramm's agar medium. Afterward the isolates with maximum ability to produce cellulose were selected and identified using biochemical tests and PCR method. After purification of the cellulose, enzymatic digestions method by cellulase enzyme and scanning electron microscope were used to confirm the presence of cellulose.   Results: Totally, 20 strains with the cellulose production ability were isolated, of them 5 strains with maximum production ability were selected for further investigation. Base on biochemical tests and sequencing method, theses isolates were classified as Acromobacter spanius, Pseudomonas luteola and Pseudomonas durifulva. In this study, the wet and dried weight of the cellulose production were measured as 16.6 and 0.1g, respectively. Conclusion: According to the findings, the cellulose can be produced by native isolates other than Acetobacter and Gluconobacter. In this study, the new native strains of produced cellulose were introduced for the first time in Iran. Also, the produced cellulose by these species has suitable traits in comparison with standard strains.   Manuscript profile

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List of Articles Parastoo Pourali