Showing 14 results for Rashedi
Volume 2, Issue 3 (8-2017)
Abstract
This article examines the common approaches of famous Rezafi and Farokhi Yazdi to the political and social freedom of expression, freedom of thought, press freedom, and the freedom of workers and peasants through an analytical descriptive method based on the American School of Comparative Literature. The most important results of this article are that both poets devote their poetry to the liberation and liberation of the people in the form of tyranny, and have followed ethical issues in this regard, although Farrokhi Yazdi's insistence on freedom is more than the famous one.
Volume 4, Issue 3 (9-2018)
Abstract
This study is aimed to explore the fauna of grasshoppers and locusts (Orthoptera) within the county of Dasht-e Azadegan (Khuzestan Province), where is placed a vast plain with geographical coordinates of 47°42′ to 48°28′ E and 31°24′ to 32°57′ N. Sampling carried out since March 2015 until end of August 2016 using insect sweeping net and also light torch at eleven selected sites and continued for the duration of all seasons of each year every one month. The collecting sites were selected to cover the whole area in terms of climate, sea level, and vegetation. Referring to morphological identification keys and comparing the result with the type of material deposited at Hayk Mirzayans Insect Museum, out of 1770 specimens, four Families, 11 Subfamilies, 21 genera and 25 species enlisted. Out of which, one genus, and two species were discovered to be new to the fauna of Iran. Based on the yielded statistics, Aiolopus thalassinus is candidates as the most frequent species in the area.
Sajjad Vahabi Qeshlaqi, Seyed Ali Safavi, Azadeh Lak, Vahid Rashedi,
Volume 4, Issue 3 (fall 2023)
Abstract
Objectives: In the last decade, public health planners have faced challenges related to the aging rate and the increase in mental health disorders. Research has shown that mental health issues are prevalent among older adults in Qazvin, but there hasn't been a comprehensive study on the impact of the social and built environment on mental health. Therefore, this research aims to identify the physical and social environment characteristics that can influence mental health.
Methods: This study is a cross-sectional quantitative research utilizing common mental health assessment tools, such as HADS and PSS, to gather data from 361 Qazvin's historical context residents. Additionally, an environmental quality questionnaire was used to collect information on the physical and social environment of the neighborhood. The collected data was analyzed using SPSS-25 software and the hierarchical regression method.
Results and Conclusion: The data analysis revealed that individual, place, and socio-cultural factors played a significant role in determining the mental health of older adults in Qazvin City. The individual factors that affected mental health included age, gender, home ownership status, and marital status. The place factors that influenced mental health included satisfaction with the place, land use, quality of residence, security, walkability, and access to green spaces. The socio-cultural dimension also played a role in mental health, as factors such as social support and cultural activities impacted the well-being of older adults. The results of this study can help in planning and designing neighborhoods in a historical context to improve mental health.
Volume 8, Issue 2 (10-2017)
Abstract
Cellulase is one of the industrial enzymes which its production and utilization is increasingly taking into consideration due to global heed to second-generation bioethanol production. Cellulase produced by different organisms such as fungi, bacteria, insects, and plants. With increase in utilization of this enzyme and need for reduction in the enzymes price for production of second-generation bioethanol, the production of recombinant enzyme has been considered noticeably.
In this study, by investigation of corn steep liquor as nitrogen source and second carbon source after glycerol, a new medium is designed based on SYN6 salt medium then biomass and endoglucanase II production by methylotrophic yeast was optimized. Experiments designed by one-factor and response surface methodology used for optimization.
Results showed that optimum conditions for biomass and endoglucanase production are 5.5% (w/v) and 6.15% (w/v) of corn steep liquor respectively. New optimized conditions increased 41.4% and 69.7% for biomass and recombinant enzyme production respectively.
Volume 9, Issue 2 (Spring 2018)
Abstract
Aims: The effect of crude oil pollutants on water and soil pollution and ecological changes has resulted in several studies on the identification and removal of these pollutants. The biological methods have been highly regarded for controlling this type of pollution due to their optimal performance. The aim of this study was the comparative assessment of crude oil biodegradation by Acinetobacter Calcoaceticus RAG-1 in the presence and absence of biofunctional magnetic nanoparticles.
Materials and Methods: In this laboratory research, the amount of degradation of N-decane and Hexadecane were studied, as indices of normal paraffins in crude oil pollutions, by Acinetobacter Calcoaceticus RAG-1 in the optimal conditions, which Emulsan produced. Also, the effect of magnetic nanoparticles of iron oxide coated with two layers of Decanoic acid on the degradation was investigated separately. The independent t-test was performed to examine the significance of the model parameters and the two-way ANOVA was used to examine the goodness of fit. The experiment was done with a fractional factorial design. For statistical analysis of the results, Minitab V.16 software was used.
Findings: The biodegradation of N-decane and Hexadecane were obtained 85% and 86%, respectively, after 60 days. The presence of nanoparticles also led to an improvement in the biodegradation process and an increase of 91% and 89%, respectively.
Conclusion: Acinetobacter Calcoaceticus RAG- succeeds in eliminating paraffinic compounds from crude oil with medium chain length. The effect of presence of nanoparticle in the biodegradation of N-decane is greater than that of Hexadecane.
Volume 9, Issue 2 (Spring 2018)
Abstract
Aims: Today, crude oil is one of the main sources of energy. The combustion of sulfur-containing compounds in fossil fuels leads to the production of sulfur oxides that has adverse effects to human health and the environment. At the moment, the current method for removal of sulfur is Hydrodesulfurization. The aim of this study was to investigate the effect of magnetic nanoparticles and modified carbon nanotubes as nano-adsorbent on improving the biodesulfurization activity of microorganisms (Rhodococcus erythropolis IGTS8).
Materials and Methods: In the current experimental study, the nanoparticles were synthesized by chemical co-precipitation and the carbon nanotubes were initially carboxylated. Multi-layer carbon nanotubes were mixed with 95% sulfuric acid and 52% nitric acid (volume ratio 1:3) and, then, modified by polyethylene glycol. In order to characterize nanoparticles and carbon nanotubes, scanning transmission electron microscopy (STEM), X-ray diffraction, magnetic surveys, analysis of arch Raman, and fourier-transform infrared spectroscopy (FTIR) were conducted.
Findings: The size of nanoparticles was estimated to be 7-8nm and modified carbon nanotubes showed the highest solubility as well as stability in deionized water for two weeks. The growth of microorganisms in the presence of magnetic nanoparticles and carbon nanotubes compared to their absence increased by 40% and 8%, respectively. Moreover the desulfurization activity of microorganisms in the presence of magnetic nanoparticles and carbon nanotubes showed a significant increase compared to their absence.
Conclusion: Nanoparticles with adsorption of sulfur compounds increase their availability for microorganisms.
Volume 9, Issue 3 (Summer 2018)
Abstract
Aims: Hepatitis B is a viral infection, which can cause serious liver problems. Hepatitis B surface antigen (HBsAg), which is produced as recombinant, is used to produce the Hepatitis B vaccine. The aim of this study was to detect DNA aptamer with high affinity against HBsAg by Systematic Evolution of Ligands by Exponential Enrichment (SELEX).
Materials and Methods: In the present experimental study, SELEX method was used to isolate and sequence a DNA aptamer with high affinity against HBsAg. The affinity of this monoclonal nucleotide sequence was calculated by fluorimetric method. The difference of initial absorption and residual value as a measure for the number of associated sequences were calculated with Prism 5 software by nonlinear regression method, Binding-saturation and one site-total model were performed, and the amount of electron affinity (Kd) was determined.
Findings: After performing the SELEX procedure and evaluating the amplified sequence with agarose gel, the result was positive control sample containing a bond in the range of 72nucleotides, indicating successful amplification of the selected sequence, using selective primers. During cloning steps from existing colonies of PCR reaction with aptamer specific primers, the presence of aptamer was confirmed in Escherichia coli bacteria. The reported aptamer had a stable secondary structure with a free energy of ΔG of less than -6.9kJ and Tm higher than 45°C.
Conclusion: The selected DNA aptamer has a high affinity to the target protein (HbsAg) and can be considered as an alternative for mAbs in chromatography column.
Volume 10, Issue 4 (Winter 2022)
Abstract
Comparative literature is an academic field dealing with the critical study of the literary relations between nations that, sometimes, are manifested among the fictional masterpieces of the world. One of these masterpieces is the novel Animal Farm by George Orwell, an English novelist and essayist who skillfully expressed his desired political situation and social themes in allegorical language in the novel and influenced the literature of other countries in various ways. Among the world-famous novels translated into different languages is Zayni Barakat, written by the Egyptian writer Gamal al-Ghitani and published a few decades after Animal Farm. The subject matter of the two novels is the occurrence, deviation, and hypocrisy of the rulers of the revolution but the main question is what thematic similarities there are between these two novels. The results of this research indicate that the two novels have thematic similarities in eight aspects: realization of revolution, explanation of laws, autocracy of leaders, establishment of repressive forces, populism, suppression of opponents, use of religion as a tool, and finally, transformation of revolution. Based on the American comparative literature approach and a descriptive-analytical method, this study tries to present a comparative analysis of the two novels.
Volume 11, Issue 1 (Winter 2025)
Abstract
Aims: Multiple sclerosis (MS) is a prevalent central nervous system (CNS) disorder characterized by inflammation and demyelination of nerves. The incidence of this disease has markedly risen in diverse regions, including the Middle East. Any factor that alters the quality and quantity of immune system components or influences the migration of immune cells toward the CNS may contribute to MS development. Evidence suggests that paragenetic, genetic, and environmental factors may be involved in increasing MS risk. This study aimed to investigate the effect of various infections on MS incidence.
Materials & Methods: This study included 475 MS patients and 260 healthy individuals from the Azeri population of East Azerbaijan province. Both groups filled out a questionnaire about their history of exposure to specific pathogens and infections before the age of 15.The relationship between a history of various infections and MS risk was examined.Findings: Mycoplasma pneumonia infection was significantly more prevalent in MS patients than in healthy individuals (p< .05). MS patients were more likely to suffer from common colds (p< .05), but no significant difference was observed regarding other infectious diseases (p> .05). Additionally, the prevalence of chronic infections was higher among MS patients (p< .05).
Conclusion: M.pneumoniae infection, common colds, and chronic infections were significantly more common in MS patients than in healthy controls. However, no significant association was found between other infectious diseases and MS risk. These findings emphasize the possible role of specific pathogens in MS development, warranting further investigation into underlying mechanisms and contributing factors.
Volume 11, Issue 1 (Winter 2025)
Abstract
Background: Dairy products are considered as some staple food rich in nutrients. Among dairy products, ice cream is one of the most attractive and popular products. The popularity of ice cream is due to its great taste and unique texture. Considering the prevalence of traditional ice cream consumption in Iran and the risk of microbial contamination of these products, the microbial quality of industrial and traditional ice creams in Fars province was evaluated and compared.
Materials & Methods: A total of 470 ice cream samples were tested to determine total viable count (TVC), total coliform count (TCC), and the presence of fungi. Biochemical properties and antibiotic sensitivity of isolated bacteria were investigated.
Findings: TVC in all industrial ice cream samples was lower than the limit specified by the national standard of Iran. Coliform levels in 37% (n=100) of traditional and 1.5% (n=3) of industrial ice cream samples were higher than the permissible limit. Furthermore, 74.8 and 40% of traditional samples contained Escherichia coli and fungi and mold, respectively. Antibiogram results showed that the highest antibiotic resistance of the isolates was related to ampicillin and trimethoprim/sulfamethoxazole.
Conclusion: Traditional ice creams are highly contaminated with microbial agents resistant to two or more drugs, which poses great risks for the consumers of these products, especially children. Therefore, it is necessary to implement appropriate hygiene practices to increase the safety of ice creams. Alerting people about the risks of foodborne diseases could significantly help prevent such diseases.
Volume 12, Issue 1 (12-2020)
Abstract
Biosurfactants are produced by microorganisms. Surfactin is one of the main lipopeptide biosurfactants produced by different species of Bacillus subtilis. This study aims to analyze the effect of starch-coated Fe0and Fe3+nanoparticles on the biosurfactant production of Bacillus subtilis. Out of 70 soil samples, 20 Bacillus were isolated and genome sequenced by biochemical methods and 16S rRNA gene. Quantitative and qualitative screening methods were used to isolate and detect biosurfactant production. For the aim of this study, 61 and 63 (Bacillus subtilis subsp. Inaquosorum) were selected. Then, hemolytic activity, surfactant production and reduction of surface tension in Minimal Salt Medium containing Fe0 and Fe3+ nanoparticles were examined after 48h, 72h and 96h of culture. The binding of the nanoparticles to the surfactant was confirmed by SEM. Strain 61 was the best bacterium and Fe3+ was the best nanoparticle and it was cultured. The results were compared with the results of non-nanoparticle bioreactor. Surfactin from strain 61 culture in the Fe3+ nanoparticle bioreactor after 72 hours of growth showed higher production than the same strain culture after 72 hours without Fe3+, if continuing the research, this strain can be commercialized in the future.
Volume 13, Issue 3 (10-2024)
Abstract
In the present study, the fish protein isolate (FPI) of wastes of Siberian sturgeon (Acipenser baerii) has been substituted with fish minced (10, 20, 30, and 40%) in preparing fish nuggets. After preparing fish nuggets (88% Silver carp fillet) and initial cooking, the parameters such as approximate analysis, product yield, weight loss, pick-up, microbial growth, and sensory evaluation were investigated. The results showed that the lowest amount of moisture is related to the IP40 Group and no significant difference exists between other treatments. In comparison, the amount of protein in the control sample was the highest (18.00 ± 0.04) and it was decreased with the increase of FPI substitution (P<0.05). The highest amount of weight loss during final cooking was related to the control and IP10 treatments, and the highest product yield was associated with IP20, IP30, and IP40 treatments (P<0.05). The microbial growth results did not show any significant difference among the treatments (P>0.05). Moreover, the sensory evaluation showed the control group, which was only with fish minced, had better taste, smell, texture, etc. than the treatments containing isolated protein. The results of this research showed that the minced fish of silver carp and the FPI by-product can be used to produce fish nuggets, and although in some physical properties, the nuggets containing higher amounts of isolated protein have shown better results, according to the amount of protein and sensory evaluation, the control and the sample containing %10 FPI had better results.
Volume 13, Issue 55 (9-2015)
Abstract
Biosurfactants are amphiphilic compounds that are produced by bacteria and fungi and they are able to reduce surface tension. These compounds are preferred due to less toxicity and better degradation than chemical surfactants and they have many applications in the petroleum, food and pharmaceutical industries. The purpose of this study was the investigation of production conditions of biosurfactant from Bacillus strains identified in Biotechnology Laboratory, Chemical Engineering Department, Tehran university, that been named HR1, HR2, and HR3. Materials and Methods: After performing the inoculation, the culture medium incubated at different temperatures and times and rotation rates and then obtained biosurfactant extracted and measured by solvent. According to the results, temperature, incubation time and rotation rate are affecting factors on biosurfactant production. The maximum amount of biosurfactant was obtained by HR1 in 33 °C and 150 rpm after 5 days incubation. acillus HR1 is appropriate for biosurfactant production for use in various industries, especially in the food industry.
Volume 19, Issue 6 (11-2017)
Abstract
In hot air dryers, only a small percentage of the provided thermal energy is used for the drying process, while a large fraction is lost via the exhaust air. To recycle waste heat from the exhaust air, the present study aimed to develop a solar dryer equipped with a novel heat recovery system. The designed dryer comprised of a solar air collector, a drying chamber, an internal closed-loop air circuit and an open-duct heat recovery system. The evaluation tests were conducted at different allowable relative humidities (RH) and mass flow rates of the recirculating air. The results indicated that the best solar fraction was at the highest RH and air flow rate. Increasing the RH from 7 to 17% caused a reduction of 51% in electricity consumption. Furthermore, electrical energy needed for drying increased by 24% with raising the air flow rate from 0.008 to 0.016 kg s-1. A minimum specific energy consumption of 7.54 MJ kg-1 was observed at the highest RH and the lowest air flow rate. At a constant RH, reduction of the air flow rate led to an increasing trend in lightness and decreasing trends in browning index of the products. Moreover, increasing the RH from 7 to 17% increased lightness and decreased browning index. In general, it can be stated that the best colour quality was achieved when the minimum air flow rate and the maximum RH were used for the solar drying.
