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Open Access Article
1 - Comparison of CYP51A gene expression of Aspergillus fumigatus isolates against fluconazole and nano-fluconazole
Sarrafha Sarrafha, S.J. Hashemi Hazaveh S. Rezaei M. Bayat,Aspergillosis is an opportunistic fungal infection in animals. The disease is mainly respiratory, but other disease manifestations also occur in poultry. Researchers have shown that, one of the reasons for the increase in drug resistance in Aspergillus species is the ov MoreAspergillosis is an opportunistic fungal infection in animals. The disease is mainly respiratory, but other disease manifestations also occur in poultry. Researchers have shown that, one of the reasons for the increase in drug resistance in Aspergillus species is the overexpression of the CYP51A gene. This study compared CYP51A gene expression of Aspergillus fumigatus isolated from poultry against fluconazole and nano-fluconazole. Fluconazole liposomal-nanoparticles were prepared by the thin layer hydration method. We dissolved 5.12 mg of fluconazole powder in 1 ml of sterile distilled water and 6 ml of chloroform-methanol organic solvent. We added 51 mg of lecithin and 5 mg of cholesterol to it. The size of nanoparticles was 88.9±12.1 nm and the surface charge of these nanoparticles was -20.12±1.88 mv. We also used a Scanning-Electron Microscope to study the structure of nanoparticles. Thirty samples of A. fumigatus were collected from poultry lung nodules. Minimum inhibitory concentration (MIC) was performed by standard Broth Microdilution method according to NCCLS-M38A2 to evaluate the MIC of fluconazole and nano-fluconazole against isolates. We selected two high-resistance isolates to fluconazole and used them to determine the CYP51A gene expression level by real-time PCR. The results showed that nano-fluconazole had a lower MIC than fluconazole and in lower concentrations of the drug inhibited the growth of Aspergillus fumigatus isolates. CYP51A gene expression was increased in fluconazole and nano-fluconazole-treated isolates compared to the untreated state. Conversely, a decrease in CYP51A gene expression was observed in the exposure to nano-drug compared with the normal drug. Manuscript profile -
Open Access Article
2 - Mathematical Modeling and Otimization of Drying Kinetic of Quince (Cydonia olonga) Fruit Slices
Morteza Mohamadi Zahra pour Falah Monire Nahardani Seyed Mohamad MeshkaniIntroduction: Drying is one of the oldest methods for preservation of agricultural products and it is aimed and tried to effectively increase the drying rate by heat and humidity transfer. Materials and Methods: In this study, drying process for quince fruit slices with MoreIntroduction: Drying is one of the oldest methods for preservation of agricultural products and it is aimed and tried to effectively increase the drying rate by heat and humidity transfer. Materials and Methods: In this study, drying process for quince fruit slices with 3, 5 and 7 mm thickness at 60–80°C to reach a maximum of diffusion effects (Deff) and decrease drying time using response surface methodology have been optimised. Results: The results showed that Midli model had minimum amounts of RMSE, MRPD and W2 and a maximum of R2. Optimization of drying process indicated that the application of 71°C for 7mm thickness had the most diffusion effect with least drying time. Conclusion: Hot air drying method removes the moisture from the fruit and generally is suitable for drying quince fruit. Manuscript profile -
Open Access Article
3 - The Antimicrobial Effect of Garlic Extract on Staphylococous aureus and Escherichia coli O157:H7 in Ready to Cook Chicken
مریم Ranjbar انوشه Sharifan شاهرخ Shabani مهدی Amin AfsharIntroduction: In recent years chemical preservatives have been commonly used in foods to increase the shelf life. Due to these preservatives their continuous use in food might not be recommended therefore the application of natural preservatives, substances that have be MoreIntroduction: In recent years chemical preservatives have been commonly used in foods to increase the shelf life. Due to these preservatives their continuous use in food might not be recommended therefore the application of natural preservatives, substances that have been employed for a long period is preferred. In this research, the antimicrobial effects of garlic extract, a natural preservative has been investigated in ready to cook chicken. Materials and Methods: The minimum inhibitory concentrations of the garlic extract were determined by using agar dilution method for Staphylococousaureus and Escherichia coli O157:H7in vitro. Furthermore for testing the antimicrobial effect of garlic extract in food system, different concentrations of garlic extract (0, 6, 7, 8, 10 mg/ml) were added to ready to cook chicken and the activities were evaluated after 24, 48, 72 hours and one week .The effects of adding different concentrations of extract on sensory behaviour were also evaluated. Results: The results have shown that Garlic extract has significant anti-microbial effects on the tested bacteria and the MIC was 7 mg/ml for both bacteria. By increasing the concentration of the garlic extract, the counts were reduced (p<0.05). It is also proved that the optimum concentrations (7, 8 mg/ml) of garlic extract had a significant effect on the sensory characteristics of cooked chicken. Conclusion: The optimum concentration of garlic extract, apart from decreasing the bacterial counts and increasing the shelf life, had a positive effect on organoleptic properties of cooked chicken. Therefore this compound might be employed as replacement for the chemical preservatives used in food industry. Manuscript profile -
Open Access Article
4 - Leucas aspera (Willd.) L.: Antibacterial, antifungal and mosquitocidal activities
Manickam Pavunraj Ganapathy Ramasubbu Kathirvelu Baskar -
Open Access Article
5 - Chemical composition of Leplaea mayombensis (Pellegrin) Staner
Djeukeu Charlie Hermine Laure Djomkam Maza Kenmogne Ariane Sewald Norbert Wansi Duplex Vardamides Catherine -
Open Access Article
6 - Investigating the antimicrobial activity of different extracts of neem plant on antibiotic resistant Escherichia coli
Reza rohani batool heydari saeide saeidiAbstract:Neem (Azadirachta indica) is known as a medicinal plant due to its antibacterial, antimalarial, antiviral and antifungal properties. The aim of this study is to investigate the antimicrobial activity of neem medicinal plant prepared with different solvents on a MoreAbstract:Neem (Azadirachta indica) is known as a medicinal plant due to its antibacterial, antimalarial, antiviral and antifungal properties. The aim of this study is to investigate the antimicrobial activity of neem medicinal plant prepared with different solvents on antibiotic resistant Escherichia coli.Materials and methods:Neem medicinal plant leaves were collected from Sistan and Baluchistan region, extracted in dry shade and using different solvents, and minimum inhibitory concentration and minimum lethal concentration were determined by microdilution method.Results:The results of this study showed that the lowest inhibitory concentration of ethanol extract of neem against Escherichia coli was 2.5 mg/ml, and 2 strains were inhibited at this concentration, while the highest inhibitory concentration was 10 mg/ml and 4 strains were inhibited in this concentration.The lowest inhibitory concentration of neem acetone extract is 0.62 mg/ml, and one strain is inhibited at this concentration, and the highest inhibitory concentration is 5 mg/ml, and 5 strains are inhibited at this concentration. While the lowest and highest inhibitory concentrations against Escherichia coli were 1.25 and 10 mg/ml, and 1 and 3 strains were inhibited at this concentration.The lowest inhibitory concentration of neem acetone extract is 0.62 mg/ml, and one strain is inhibited at this concentration, and the highest inhibitory concentration is 5 mg/ml, and 5 strains are inhibited at this concentrationDiscussion:The results showed that neem extract had a good inhibitory effect on Escherichia coli at low dilutions. Manuscript profile -
Open Access Article
7 - Antimicrobial Activity medical plant extracts, Prosopis farcta L. and Datura stramonium L., against Salmonella thyphimurium isolated from poultry in Zabol
mehdi jahantigh Maryam Beigomi Zaynab Mohkami saeide saeidiThe aim of this study was to investigate the antimicrobial activity of Prosopis farcta L. and Datura stramonium L. extracts on Salmonella thyphimurium isolated from poultry in Zabol. The P. farcta and D. stramonium were collected from Collection of medicinal plants, Ins MoreThe aim of this study was to investigate the antimicrobial activity of Prosopis farcta L. and Datura stramonium L. extracts on Salmonella thyphimurium isolated from poultry in Zabol. The P. farcta and D. stramonium were collected from Collection of medicinal plants, Institute of Agricultural Research at University of Zabol. Strains of Salmonella thyphimurium were isolated from poultry droppings. Antibiotic resistance pattern was determined by Kirby Bauer method. Finally, the minimum inhibitory concentration (MIC) and minimum bactericide concentration (MBC) were determined by microdilution method. The results of this study showed that the lowest inhibitory concentration of Datura extract against Salmonella typhimurium was 3.1 ppm; While the minimum inhibitory concentration for Prosopis extract was 6.5 ppm. Also, the minimum bactericidal concentration of Datura extract was 6.25 and Prosopis extract was 12.5. The results of this study showed that Datura extract was more effective in inhibiting Salmonella bacteria than Prosopis extract. Evaluation of Pearson correlation coefficient between total phenol content, total flavonoids and MIC, and MBC showed an inverse relationship between these parameters. So that the Datura extract, which contained higher total phenol, and total flavonoid, had lower MIC and MBC and therefore was more effective in inhibiting bacteria. The results of our experiments showed that Datura and Prosopis extracts have good antimicrobial effects and can be used to treat infections caused by Salmonella typhimurium in poultry. Manuscript profile -
Open Access Article
8 - Inhibitory effect of Carum copticum, Rosa damascene mill, Anethum graveolens and Cuminum cyminum essential oils on some food-borne microbes
T. Abedi N. Asefi S. Hanifian S. DehghanDue to the increasing need to gain knowledge about the inhibitory effects of plants, in this study, the antimicrobial effects of Carum copticum, Rosa damascene, Anethum graveolens and Cuminum cyminum essential oils on some bacteria and yeast were investigated. The essen MoreDue to the increasing need to gain knowledge about the inhibitory effects of plants, in this study, the antimicrobial effects of Carum copticum, Rosa damascene, Anethum graveolens and Cuminum cyminum essential oils on some bacteria and yeast were investigated. The essential oils were extracted using a Clevenger apparatus and their compounds were determined by gas chromatography equipped with a mass spectrometer. Also, the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of the essential oils were determined and their antimicrobial properties were compared by well-diffusion method. MIC results of Bacillus cereus and Staphylococcus aureus showed that Cuminum cyminum essential oil with 50 µg/ml had the lowest bactericidal effect. The essential oils of Carum copticum, Anethum graveolens and Rosa damascene had the highest bactericidal effect with 0.78 μg/ml on the studied bacteria. In the case of Escherichia coli, the highest antimicrobial effect was shown by Carum copticum essential oil at 6.25 μg/ml. Rosa damascene essential oil, with a concentration of 3.12 μg/ml, had the highest antifungal properties on Candida albicans. In the case of Saccharomyces cerevisiae, the most antifungal effect was provided by Rosa damascene and Cuminum cyminum essential oils with 0.78 μg/ml. The antibacterial effect of Carum copticum essential oil was higher than the other three essential oils. In the case of yeasts, Rosa damascene and Cuminum cyminum essential oils had the most antifungal effect. According to the results, Carum copticum essential oil in controlling bacteria and Rosa damascene essential oil in controlling studied yeasts are recommended. Manuscript profile -
Open Access Article
9 - Antibacterial effects of castor oil on foodborne pathogens: comparative evaluation of the components
samaneh hatami masud Yavarmanesh, M. Ali Hatami, S.For centuries, antimicrobial compounds derived from plants, have been used for medicinal treatment. The aim of this study was to evaluate the antibacterial activity of castor seed oil extracted from Mashhad and Isfahan varieties on Staphylococcus aureus, Escherichia col MoreFor centuries, antimicrobial compounds derived from plants, have been used for medicinal treatment. The aim of this study was to evaluate the antibacterial activity of castor seed oil extracted from Mashhad and Isfahan varieties on Staphylococcus aureus, Escherichia coli and Listeria inocula. The sensitivity of the indicator bacteria was evaluated using disc diffusion technique and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were tested by broth micro-dilution assays. Oil from castor seeds was extract by Soxhlet method and the extracted oils were analyzed by a gas chromatograph connected to a mass spectrometer (GC/MS). According to the results of various dilutions of the extracts, MIC for castor oils ranged 12.5-25%, except for the Isfahan variety that was estimated at 6.25-12.5% for E. coli. The two varieties of castor oils showed the MBC activity on the indicator organisms at the original (100%) concentration. Based on GC/MS data, ricinoleic acid (1.307%), genetistic acid (0.597%) and palmitic acid (1.947%) were detected in oil extracted from Isfahan variety; meanwhile these compounds did not found in Mashhad variety. According to the results, the two castor varieties had antibacterial impact on E. coli. In addition, the overall antimicrobial activity of Isfahan variety was higher than Mashhad type. It seems that the presence of phenolic compounds as well as camphoric and unsaturated fatty acids is the major reason for the higher antibacterial effect of Isfahan variety on E. coli. Considering the inhibitory impact of castor oil, it can be used as a natural preservative in food industry. Manuscript profile -
Open Access Article
10 - Comparison of antibacterial activity of four cultivars of olive (Olea europaea) leaf extract on Bacillus cereus
مریم Abbasvali محمود Esmaeili Koutamehr حمدالله Moshtaghi M.H EskandariIn recent years, plant extracts have been used as antimicrobial agents. One of these extracts is olive leaf extract, which has antimicrobial properties due to its phenolic compounds. In current study the leaf extract of four olive (Olea europaea) cultivars (Shiraz, Zard MoreIn recent years, plant extracts have been used as antimicrobial agents. One of these extracts is olive leaf extract, which has antimicrobial properties due to its phenolic compounds. In current study the leaf extract of four olive (Olea europaea) cultivars (Shiraz, Zard, Roghani and Dezfool) was extracted by different solvents (acetone, methanol and ethanol) using microwave-assisted extraction method. Then the antibacterial activity of the extracts was assessed on Bacillus cereus. The antibacterial activity of the extracts was determined using the standard and micro broth-dilution methods. All experiments were carried out in triplicate. Minimum inhibitory concentration (MIC) of eleven extracts was estimated as 20 mg/ml, and only MIC of the methanolic extract of Roghani cultivar was 10 mg/ml. Bacterial growth curve of B. cereus in the presence of olive leaf extracts was drawn after 24 h incubation at 37 °C and the mean percentage of growth inhibition of each extract was measured after 24 hours. The results showed that in comparison with the other cultivars, the methanolic extract of Roghani cultivar with the percentage of growth inhibition of 91.3% and 87.8% (in the concentrations of 10 and 20 mg/ml, respectively), demonstrated stronger antibacterial effect on B. cereus. This study indicated that olive leaf extract from inexpensive agricultural waste might be a valuable bioactive source with antibacterial activity, and seem to be applicable as a safe food additive. Manuscript profile -
Open Access Article
11 - Antibacterial and antibiofilm effects of Shirazi thyme (Zataria multifora) essential oil on Salmonella isolates from poultry and humans using the Minimum Inhibitory Concentration method
zeynal zeynali Jalal Shayegh Shahin TofangdarzadehPlant essential oils are complex compounds of different chemical components with different amounts. These substances are one of the potential sources of antibacterial compounds and are very effective and useful for this purpose. The aim of this study was to investigate MorePlant essential oils are complex compounds of different chemical components with different amounts. These substances are one of the potential sources of antibacterial compounds and are very effective and useful for this purpose. The aim of this study was to investigate the antibacterial effect of Zataria multiflora essential oil on Salmonella isolated from poultry and humans using the Minimum Inhibitory Concentration (MIC) method. Steam distillation was used to extract the essential oil, and then the composition of the essential oil was determined using the Gas Chromatography-Mass Spectroscopy (Gc-Ms) method. Broth microdilution method was used to determine the MIC of Zataria multiflora essential oil. Also, ELISA was used to investigate the anti-biofilm effect of Zataria multiflora essential oil. Based on the results obtained in the present study, it was shown that more than 64.9% of essential oil consists of three substances: thymol, caracol, and linanol which make up46.62%, 13.85%, and 8.95% of the essential oil repectively. It was found that the MIC level For Zataria multiflora essential oil was in the range of 0.39-12.5 mg/ml in Salmonella isolates. Also, based on the results obtained in this study, the minimum bactericidal concentration (MBC) of applied essential oil in Salmonella isolates was in the range of 1.56-12.5 mg/ml. The placement of Salmonella bacteria isolates alongside essential oil at a possible level of 1% significantly (p<0.001) decreased biofilm production. Overall, the results of this research showed that Shirazi thyme essential oil has significant antibacterial effects and reduced biofilm production of Salmonella bacteria isolates by a significant percentage. Manuscript profile -
Open Access Article
12 - Antimicrobial activity of aqueous, alcoholic and buffer extracts of honey-bee propolis on oral-intestinal bacteria
Mahnoush Aboutorab Mohammad Goli Elham KhosraviPropolis plays an antibacterial, anti-fungal, anti-parasitic, antioxidant, anti-inflammatory, anti-caries role due to its plant-derived compounds such as polyphenols and proteins such as 10-HDA. It has long been a therapeutic role for diseases, especially infections. In MorePropolis plays an antibacterial, anti-fungal, anti-parasitic, antioxidant, anti-inflammatory, anti-caries role due to its plant-derived compounds such as polyphenols and proteins such as 10-HDA. It has long been a therapeutic role for diseases, especially infections. In this study antimicrobial activity of alcoholic, aqueous and buffer extract of propolis, on oral bacteria including Streptococcus mutans, Streptococcus epidermidis, Staphylococcus aureus, and gastro-intestinal bacteria including Streptococcus salivarius and Escherichia coli measured using micro broth dilution test for assessing of minimum inhibitory concentration (MIC) and disk diffusion test for assessing of diameter of inhibition zone. The MIC did not differ significantly between the three alcoholic, aqueous and buffer extracts, i.e., the effect of the solvents on the solubility of the antibacterial compounds was approximately the same (P > 0.05). The most resistant gram-positive bacterium to alcoholic and buffer extract, Streptococcus mutans and the most resistant to all extracts, Escherichia coli, were reported. There was no significant difference between the bacterial resistance in the aqueous extract of propolis (P> 0.05). In the disk diffusion test, increasing the concentration of extracts had a significant effect on the bacterial killing rate and was identified as the most susceptible bacterium to the extracts Staphylococcus epidermidis and the most resistant bacterium Staphylococcus aureus. The bacteria were also more sensitive to buffer extract. Manuscript profile -
Open Access Article
13 - مطالعه اثر مقایسه ای عصاره اکالیپتوس بر روی کاندیدا آلبیکنس و باکتری های بیمارگر انسانی
زهرا دهباشی فروغ فرقانی سید کاظم صباغ سعیده سعیدی مقدمه و هدف: در طی سالیان اخیر، بیماریهای عفونی ناشی از قارچهای فرصت طلب مانند Candida albicans و افزایش مقاومت باکتریهای بیماریای انسانی به آنتی بیوتیک های رایج منجر به بروز مشکلات زیادی در ارتباط با درمان این بیماری ها شده است. هدف از مطالعه حاضر بررسی اثرات ضد More مقدمه و هدف: در طی سالیان اخیر، بیماریهای عفونی ناشی از قارچهای فرصت طلب مانند Candida albicans و افزایش مقاومت باکتریهای بیماریای انسانی به آنتی بیوتیک های رایج منجر به بروز مشکلات زیادی در ارتباط با درمان این بیماری ها شده است. هدف از مطالعه حاضر بررسی اثرات ضد قارچی و باکتریایی عصاره گیاه اکالیپتوس بر علیه جدایه های Candida albicans جدا شده از نمونه های کلینیکی و تعدادی از جدایه های استاندارد از باکتری های بیماری زای انسانی بود. روش تحقیق: عصاره اکایپتوس با استفاده از از دستگاه روتاری و روش خیساندن تهیه گردید. تعداد 30 جدایه از Candida albicans از بیماران مراجعه کننده به متخصص زنان و زایمان جدا شده و پس از خالص سازی به وسیله کلید های معتبر شناسایی شدند. در نهایت تعداد 30 جدایه برای بررسی اثر بازدارندگی رشد عصاره مورد استفاده قرار گرفتند. حداقل غلظت کشندگی و حداقل غلظت بازدارندگی عصاره اکالیپتوس علیه 5 سویه استاندارد باکتریایی شامل Staphylococcus aureu, Shigella dysenteriae, Listeria monocytogenes, Vibrio cholera and Bacillus cereusبا روش موردارزیابی قرار گرفت. نتایج و بحث: نتایج ما نشان داد که در مقایسه با سویه های باکتریایی، جدایه های قرچی حساسیت بیشتری را نسبت به عصاره اکالیپتوس دارا می باشد. بیشترین و کمترین اثر کشندگی عصاره به ترتیب برای غلظت های 12.5 و 3.1 پی پی ام و علیه S. aureus و B. cereusثبت گردید. ماندد اثر کشندگی، بیشترین اثر بازدارندگی (20 پی پی ام) و کمترین اثر بازدارندگی (5پی پی ام) علیه S. aureus و B. cereusثبت گردید. حداقل غلظت کشندگی عصاره برای جلوگیری از رشد قارچی در غلظت 50 پی پی ام ثبت در حالی که بیشترین غلظت برای اثر بازدارندگی 150 پی پی ام ثبت گردید. توصیه های کاربردی/ صنعتی: نتایج این مطالعه نشان داد که غلظت بالای اکالیپتوس قادر به بازدارندگی رشد قارچ Candida albicansمی باشد و در نتیجه مطالعات بیشتری در جهت آنالیز ترکیبات موثر در عصاره این گیاه می تواند انجام شود. Manuscript profile -
Open Access Article
14 - بررسی عصاره آبی و اتانولی زرشک معمولی بر باکتری های گرم منفی مقاوم به چند آنتی بیوتیک (MDR)
زهرا عطائی کچوئی سیما یحیی آبادی منیر دودیمقدمه و هدف:در سال های اخیر بدلیل مصرف بی رویه غیر منطقی داروهای مصنوعی میزان مقاومت دارویی میکروارگانیسم های بیماری زا در حال افزایش است و نیاز به ترکیبات جدید می باشد. هدف از این مطالعه بررسی اثر عصاره آبی و اتانولی میوه زرشک معمولی بر روی هفت گونه باکتری بیماری Moreمقدمه و هدف:در سال های اخیر بدلیل مصرف بی رویه غیر منطقی داروهای مصنوعی میزان مقاومت دارویی میکروارگانیسم های بیماری زا در حال افزایش است و نیاز به ترکیبات جدید می باشد. هدف از این مطالعه بررسی اثر عصاره آبی و اتانولی میوه زرشک معمولی بر روی هفت گونه باکتری بیماری زای گرم منفی مقاوم به چند داروی شایع در محیط آزمایشگاه بود.این مطالعه بر روی 100 نمونه از سویه های باکتریایی اشریشیا کلای، کلبسیلا پنومونیه،, پروتئوس میرابیلیس، سیتروباکتر فروندی، انتروباکتر آئروژنز، سودوموناس آئروژینوزاو اسینتوباکتر بومانی که همگی مقاوم به چند دارو (MDR) بوده و از آزمایشگاه تشخیص طبی وحید زرین شهر و بیمارستان های شریعتی،صدوقی و غرضی شهر اصفهان جداسازی شده بودند و هم چنین بر روی سویه های استاندارد این باکتری ها تهیه شده از سازمان پژوهش های علمی و صنعتی ایران انجام گرفت. روش تحقیق:میوه زرشک معمولی از مرکز تحقیقات کشاورزی و منابع طبیعی استان اصفهان تهیه گردید. عصاره آبی و اتانولی به روش خیساندن تهیه گردید. بعد از تعیین هویت باکتری ها، مقاومت آنتی بیوتیکی آن ها با روش انتشار دیسک تعیین گردید. بررسی اثر ضد باکتریایی عصاره آبی و اتانولی میوه زرشک معمولی بر روی رشد باکتری های مقاوم به چند دارو با روش انتشار چاهک در چهار غلظت 50 100 400و800 میلی گرم بر میلی لیتر بررسی شد. هم چنین حداقل غلظت مهار کنندگی و حداقل غلظت کشندگی این عصاره ها روی باکتری ها به روش ماکرو دایلوشن صورت گرفت. داده های جمع آوری شده با استفاده از نرم افزار SPSS و آزمون آماری کراسکال والیس و من ویتنی تجزیه و تحلیل شدند. نتایج و بحث:در وش انتشار چاهک عصاره اتانولی و آبی میوه زرشک معمولی اثر مهارکنندگی قابل ملاحظه ای بر روی رشد ایزوله ها نشان داد. همچنین عصاره اتانولی و آبی میوه زرشک معمولی اثر مهارکنندگی بر روی سویه های استاندارد این باکتری ها داشت.نتایج نشان دهنده ی اثر بسیار عالی عصاره اتانولی زرشک در غلظت 800 میلی گرم بر میلی لیتر بر تمام سویه های باکتریایی بود. قابل قبول ترین غلظت مهارکنندگی رشد و حداقل غلظت کشندگی عصاره آبی و اتانولی میوه زرشک برای باکتری ها به ترتیب 50 و 100 میلی گرم بر میلی لیتر گزارش شد. توصیه کاربردی/ صنعتی:نتایج این مطالعه نشان داد که عصاره آبی و اتانولی میوه زرشک معمولی بر روی باکتری های مقاوم چند دارو(MDR) اثر ضد باکتریایی دارد و استفاده از آن به عنوان جایگزین آنتی بیوتیک پس از بررسی های بیشتر جهت درمان توصیه می شود. Manuscript profile -
Open Access Article
15 - بررسی فعالیت ضد میکروبی اسانس آویشن شیرازی بر روی اسینتو باکتر بومانی جدا شده از نمونه های بالینی
خدیجه رضایی کیخواهی غلامرضا باقری مهدی حسن شاهیان سعیده سعیدیمقدمه و هدف: هدف از این مطالعه بررسی فعالیت ضد میکروبی اسانس آویشن شیرازی بر روی اسینتو باکتر بومانی جدا شده از نمونه های بالینی است. روش تحقیق: دوازده سویه اسینتو باکتر بومانی از بیمارستان های شهرستان زابل جداسازی شد. اسانس آویشن شیرازی با استفاده از دستگاه کلونجر بدس Moreمقدمه و هدف: هدف از این مطالعه بررسی فعالیت ضد میکروبی اسانس آویشن شیرازی بر روی اسینتو باکتر بومانی جدا شده از نمونه های بالینی است. روش تحقیق: دوازده سویه اسینتو باکتر بومانی از بیمارستان های شهرستان زابل جداسازی شد. اسانس آویشن شیرازی با استفاده از دستگاه کلونجر بدست آمد، در نهایت حداقل غلظت مهار کنندگی و حداقل غلظت کشندگی اسانس در برابر باکتریهای ذکرشده با روش میکرودایلوشن تعیین گردید. نتایج و بحث: نتایج حاصل از این مطالعه نشان داد که کمترین غلظت مهار کنندگی در برابر باکتری ها برابر با 31/0 میلی گرم بر میلی لیتر است و تنها یک سویه از باکتری در این غلظت مهار شده است. بیشترین غلظت مهار کننندگی برابر با 10 میلی گرم بر میلی لیتر بوده و یک سویه نیز در این غلظت مهار شده است. توصیه کاربردی و صنعتی: نتایج نشان داد که اسانس با افزایش غلظت اثرات ضد میکروبی آن افزایش پیدا می کند، اسانس آویشن فعالیت ضد میکروبی خوبی حتی در غلظت های پایین از خود نشان داد. با کاربرد اسانس آویشن شیرازی علیه باکتری های بیماریزا می توان به یک ماده ضد میکروبی خوب بدون اثر جانبی دست پیدا کرد. Manuscript profile -
Open Access Article
16 - Biosynthesis of ZnO nanoparticles using green tea extract and determination of its antibiofilm effect on Pseudomonas aeruginosa strains isolated from wound infection
Behrooz Shojaee Sadi Shima Chehreii Mahla EsmaeiliBackground & Objectives: Owing to the antimicrobial activity of ZnO nanoparticles without causing resistance, such substances could be considered as an appropriate alternative to prevent bacterial biofilm formation. The aim of this study was to the biosynthesis of Z MoreBackground & Objectives: Owing to the antimicrobial activity of ZnO nanoparticles without causing resistance, such substances could be considered as an appropriate alternative to prevent bacterial biofilm formation. The aim of this study was to the biosynthesis of ZnO nanoparticles using green tea extract and determination of its effect on biofilm formation in Pseudomonas aeruginosa isolates separated from wound infection. Materials & Methods: In this cross-sectional study, biosynthetic nanoparticles were evaluated by X-ray diffraction, energy dispersive X-ray analysis, scanning electron microscopy and transmission electron microscopy. Determination of antimicrobial activity and minimum inhibitory concentration of nanoparticles were done by micro broth dilution method. The antibiofilm activity was investigated using biofilm formation by O'Toole 2011 method. Results: The biosynthesis of nanoparticles was confirmed by analysis. The size of the nanoparticles was determined in the range of 10 to 90 with an average of less than 40 nm. The nanoparticles had anti-microbial activities in concentrations of 250, 500 and 1000 ug/mL and minimum inhibitory concentration of 500 ug/mL was reported. The antimicrobial and antibiofilm effects of the nanoparticles rose with increasing the concentrations. Conclusion: The biosynthesis of nanoparticles with the extract has a variety of benefits such as simplicity, good stability, without energy consumption, less time-consuming, non-toxic wastes, economical efficiency, and large scale synthesis capability. According to the antimicrobial and antibiofilm properties, the use of these nanoparticles as coatings in medical equipment and food industries is recommended. Manuscript profile -
Open Access Article
17 - Biosorption of silver by Stenotrophomonas maltophilia strain MS8 isolated from wastewater of Silversmith’s workshop in Isfahan
Maedeh Shahsanaei Goneirani1 Ali Mohammad Ahadi Monir DoudiBackground & Objectives: Detection of the microorganisms resistant to toxic metals is the first step in the process of bioremediation. The purpose of this study was isolation of silver-resistant bacteria, determination of their minimum inhibitory concentration (MIC) MoreBackground & Objectives: Detection of the microorganisms resistant to toxic metals is the first step in the process of bioremediation. The purpose of this study was isolation of silver-resistant bacteria, determination of their minimum inhibitory concentration (MIC) and investigation on the biosorption in vitro. Materials & Methods: Sampling was carried out from the wastewater of two Silversmith’s workshop in Isfahan and effluent of the wastewater treatment plant phase 2 input in Shahinshahr. The agar dilution method and PHG II culture medium containing concentrations of 0.5, 1, 2, 4, 8, 16, 32 mM of Ag (NO3)was used to separate the metal-resistant bacteria and determine the minimum inhibitory concentration (MIC). Finally, the ribotyping method was used to identify the silver-resistant bacteria. Results: In this study seven silver-resistant bacteria were isolated, among them Ag5 showed the highest resistance to silver (MIC = 6mM). Based on the molecular analysis, this isolate belonged to a new strain, called as Stenotrophomonas maltophilia strain MS8, and its formation was deposited as KP742984 in Gene Bank (NCBI). This strain was able to absorb 11.39% of silver from medium in vitro after 120 minute and could growth well in the presence of silver. Conclusion: According to the results of this study, it seems that this isolate is a good candidate for biological removal of silver from contaminated wastewater in the future. Manuscript profile -
Open Access Article
18 - In-vitro Antibacterial and Antifungal Screening of Newly Synthesized Trifluoromethylated N-Heterocyclic ketenimines and 1-aza butadiene Derivatives
Rosa Edris Ameri Bita Mohtat Eskandar Alipour Nahid Rahimifard Behrooz Mirza -
Open Access Article
19 - Antibacterial effect of lavender essential oils on Xanthomonas campestris and Escherichia coli
Maryam Rabani Roya Rezaeian-Doloei Mehdi Jabari-NoghabiUsing of natural products instead of chemicals and antibiotics to control bacterial pathogens is interest of researchers. The aim of this study was to determine antibacterial effects of lavenderessential oil against Xanthomonas campestris and Escherichia coli in laborat MoreUsing of natural products instead of chemicals and antibiotics to control bacterial pathogens is interest of researchers. The aim of this study was to determine antibacterial effects of lavenderessential oil against Xanthomonas campestris and Escherichia coli in laboratory condition. Chemical compounds of lavender essential oils were identified by GC-MS. Antibacterial activity of essential oils in comparison with gentamicin antibiotic was determined using agar diffusion method. The minimum inhibitory concentration (MIC) of lavenderessential oils was evaluated by macrobroth dilution method by preparing different concentrations of 0.004 to 4% in nutrient broth medium. The minimum bactericidal concentration (MBC) was determined using culture method in nutrient agar medium. Zone of growth inhibition of X. campestris varied from 3.83 ± 0.35 to 18.7 ± 0.77 mm in concentration of 0.25 to 4% respectively and for E. coli in concentration 0.125 to 4 % from 4.5 ± 0.7 to 17.6 ± 0.9 mm. The MIC and MBC of lavenderessential oils against X. campestris equal of 1 and 2% and about E. coli equal to 0.125 and 0.25%, respectively. The most constitutive compounds of lavenderessential oils included of linalool (44.94%) and 1,8-cineol (21.5%). Lavender essential oils can be used as natural antimicrobial agents against pathogenic bacteria. Manuscript profile -
Open Access Article
20 - The effect of Cuminum cyminum, acidity, temperature and inoculums’ level on the growth of Xanthomonas campestris
Nazanin Miri Roya Rezaeian-Doloei Reza Sadrabadi HaghighThe Xanthomonas genus is one of the most important groups of plant pathogenic bacteria that cause post-harvest spoilage. Substantial crop losses may result from the rapid spread of the bacteria under favorable conditions, lack of seed germination, seedling death and vas MoreThe Xanthomonas genus is one of the most important groups of plant pathogenic bacteria that cause post-harvest spoilage. Substantial crop losses may result from the rapid spread of the bacteria under favorable conditions, lack of seed germination, seedling death and vascular obstruction of plant. The aim of this study was to investigate the combined effects of different concentrations of Cuminum cyminum essential oil (EO; including 0, 0.2, 0.4 and 0.8%), three levels of acidity (5, 6 and 7), two inoculums’ level (103 and 105 CFU/ml) and two incubation temperatures (26 and 28˚C) on the growth of X. campestris in the nutrient broth medium in a completely randomized design with three replications. Growth was monitored by visible turbidity during a 30-day period. The minimum inhibitory concentration and minimum bactericidal concentration of EO against X. campestris was 1 and 2% respectively. According to the results, P-cuminaldehyde was the main component, with a content of 30.5%. The statistical analysis of data showed that the maximum time to detection of bacteria (19 days) in the concentrations of 0.8% EO, pH of 5, the inoculum level of 103 CFU/ml and incubation temperature of 26˚C and the minimum time to detection (16 hours) in the inoculums level of 105 CFU/ml, pH of 7, 28 ˚C and no EO was observed. In addition to the concentration of Cuminum cyminum EO as an antimicrobial agent, acidity of medium is also considered the factors influencing the growth of X. campestris. By decreasing the pH, the time-to-detection of bacteria was increased. In conclusion, using a combination of different factors can inhibit the growth of bacteria, significantly. Manuscript profile
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