Showing 6 results for Moghadami
Volume 4, Issue 4 (No.4 (Tome 16), (Articles in Persian) 2013)
Abstract
Semantic is one of the most important features in the study of native language learning process. The study of what children know about meanings in different levels would be away for achieving how the human becomes a speaker of a language. The aim of this study is evaluating children’s understanding of semantic contribution of the universal quantifier “every” at the across-proposition level. Investigating children’s computation of the across-propositional meaning relations involving the universal quantifier “every” would thus not only be the next valuable step to consider their knowledge about the semantics of “every”, but also would make a significant contribution toward a new aspect of children’s semantic competence. In this study, a new experiment evaluates the children’s ability in inferences between entailing and entailed sentences. For sampling, 28 girls aged 3-6 years were selection randomly. Finally, the results confirmed that the competence of children is like adults with regard to the semantics in the composition and comparison of sentential meanings.
F. Moghadami, M.r. Soudi ,
Volume 9, Issue 2 (Spring 2018)
Abstract
Aims: Adaptation of native bacterial strains in every climate is considerable. Evaluation of native thermotolerant acetic acid bacteria effectively influence their optimal and beneficial use. The aim of this study was to evaluate the characteristics of productive thermotolerant acetic acid bacteria with focusing on Acetobacter sp. A10.
Materials and Methods: In the present experimental study, the native thermotolerant strain of Acetobacter sp. A10 was used. For preparation of fresh culture and maintenance of thermotolerant strain glucose yeast extract calcium carbonate was used, which contained 50g glucose, 10g yeast extract, 30g calcium carbonate, and 25g agar per liter. In order to produce acetic acid by the strain of Acetobacter sp. A10, ethanol yeast extract broth culture was used. Effect of initial concentrations of ethanol and acetic acid on the production of acetic acid by Acetobacter sp. A10 was investigated, using a culture meda containing 2% to 9% ethanol and 2% to 9% acetic acid.
Findings: This strain could produce 40g/l acetic acid from 4% (WV) ethanol in baffled shake-flasks in 24h under optimized conditions of pH 4, at 33°C, and 150rpm. The strain at 37 °C was able to produce acetic acid in the presence of a 4% and 8% initial concentration of acetic acid a. The rate of fermentation was 2.5 times more than mesophilic ones.
Conclusion: Acetobacter sp. A10 is active in a different temperature range compared to mesophilic strains and it is able to withstand ethanol and acetic acid to more concentrations. In addition, it has higher efficiency, as well as greater rate and power of fermentation.
Fouzieh Moghadami,
Volume 11, Issue 4 (fall 2020)
Abstract
Coenzyme Q10 (CoQ10) is a component of the respiratory chain that is responsible for generating energy by transmitting electrons. Today, due to the increasing demand for CoQ10, its production is increasing. In this study, the effect of extract containing of carotenoid from bell pepper as a precursor was investigated on CoQ10 production by Gluconobacter japonicus FM10. For this purpose, at first the total carotenoid was extracted from four colors of bell peppers and then the minimum inhibitory concentration of these extracts was measured. In the next step, the effect of extracts was investigated on CoQ10 production in two phases of the exponential and stationary. The results showed that CoQ10 production was increased in the presence of the bell pepper extract (4.1 mg / L in the presence of red bell pepper extract). In fact, 1.5 times more than when no extract was added. Adding red pepper extract in the exponential phase also increased CoQ10 to 4.9 mg / L, while adding it in the stationary phase did not affect CoQ10 increasing. Therefore, it can be concluded that the carotenoid in bell pepper extract increase the production of CoQ10 by affecting cell growth and increasing it. Therefore, the carotenoid-extract of bell pepper can be introduced as a suitable precursor to increase CoQ10 production.
Foozieh Moghadami, Mahdi Kalantari,
Volume 13, Issue 1 (3-2022)
Abstract
Mutation in microbial strains to increase coenzyme Q10 production is one of the successful strategies for strain development. Therefore, in this study, the production of coenzyme Q10 by Gluconobacter oxydans H621 was investigated through chemical mutation with nitrosoguanidine using the response surface methodology. Nitrosoguanidine was used to induce mutations at different concentrations (2.79 - 4.21 mg/mL) and treatment times (11.89 – 33.12 minutes), which was designed by a central composite design. The detection of mutant strains was investigated through their ability to grow in medium containing 160 μg/mL of menadione. The mutant strains were then examined for coenzyme Q10 and dry cell weight production. The results showed that no mutant strains were obtained at a concentration of 4 mg/ml and above. The highest number of mutant colonies was obtained at a concentration of 2.79 mg/mL of nitrosoguanidine and treatment time of 22.5 minutes. It was also found that the concentration of nitrosoguanidine was effective on mutagenesis but the treatment time had a little effect. The mutant strain that was able to produce the highest amount of coenzyme Q10 produced 5.2 mg/L, which was twice as much as the parent strain. According to the results of this study, it is concluded that by inducing mutation using nitrosoguanidine, mutant strains can be generated in Gluconobacter oxydans H621 that are able to produce more coenzyme Q10 than the parent strain.
Fouzieh Moghadami, Amirarsalan Kavyanifard,
Volume 14, Issue 4 (9-2023)
Abstract
Microorganisms play an important role in formation of mines. In this research, the bacteria inhabiting in Aq-Darreh Takab gold mine were isolated and compared with agricultural soils. The isolates were characterized using 16S rDNA sequencing and the homology searches were performed using BlastN, EzTaxon, and RDP Classifier web tools. Resistance of the isolates was also investigated against arsenic and silver in the presence and absence of 3.5 ppm gold. Although the control soil showed a wide variety of bacterial diversity (43 isolates belonging to 13 genera), only 17 isolates belonging to 11 genera were isolated from mine soils including Acinetobacter, Agrobacterium, Comamonas, Deinococcus, Listeria, Microbacterium, Micrococcus, Pseudomonas, Rhizobium, Roseomonas and Staphylococcus. Among the isolates, A. radiobacter, D. ficus, M. antarcticus, M. luteus, R. radiobacter and R. selenitidurans were able to tolerate different amounts of arsenic and silver in the presence of gold, among which A. radiobacter and D. ficus showed the highest resistance in such a way that they grew in the presence of 50 ppm arsenic, 50 ppm silver, and 3.5 ppm gold. Our results showed that bacterial diversity in soils containing gold, silver and arsenic metals is less than agricultural soils. It was also found that the bacterial diversity in gold mines depends on the amount of gold and the amount and type of associated elements. Due to high resistance of two endogenous bacterial species to arsenic and silver, A. radiobacter and D. ficus, have also the potential for industrial purposes in environments contaminated with these metals.
Volume 15, Issue 61 (12-2018)
Abstract
The present paper studies through a sociological approach the women-oriented literary studies (research papers, books, theses, and dissertations) in the field of contemporary fiction from ۱۳۰۰ to ۱۳۹۴. An attempt has also been made to conduct a critical analysis, by examining and providing tables and charts, of research annals, their increasing trend, popular works and writers, researchers' genders, and research approaches. The findings demonstrate that social factors increased the researchers' tendency toward studying the woman-based fiction from late ۱۳۸۰s. Simin Daneshvar, Zoya Pirzad, and the novels Savushun and I Will Turn Off the Lights have attracted the most researchers' attention, and the number of male researches is higher than that of the female researchers. Sociological, feminist, and psychological criticisms are the primary approaches, and dealing with such issues as patriarchy, feminine identity loss, gender discrimination, violence against women the secondary approaches of the studies. The approaches used indicate that the portrayal of woman in contemporary literary studies, although having become more accurate, is still unpleasant and the values have been ignored.
