39 results on '"Yaghmaei S"'
Search Results
2. POS-871 THE CORRELATION BETWEEN CHEST CT FINDINGS AND OUTCOME IN COVID-19 PATIENTS WITH AND WITHOUT ACUTE KIDNEY INJURY
- Author
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SABAGHIAN, T., primary, Raoufi, M., additional, Danaei, B., additional, Moradi, O., additional, Ebrat Balkhkanlou, H., additional, Heidari Almasi, M., additional, Alavi, A.A., additional, Masbough, F., additional, Yaghmaei, S., additional, and Falsafi, A., additional
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- 2022
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3. Heavy metal tolerance of fungi
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Anahid, S., Yaghmaei, S., and Ghobadinejad, Z.
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- 2011
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4. Recovery of metals from spent refinery hydrocracking catalyst using adapted Aspergillus niger
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Amiri, F., Yaghmaei, S., Mousavi, S.M., and Sheibani, S.
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- 2011
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5. Of: Preventing Growth of Pathogens in Pasteurized Digester Solids
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Iranpour, R., Moghaddam, O., Stenstrom, M., Miller, D., Yaghmaei, S., Ward, Amanda, Stensel, H. David, Ferguson, John F., Ma, Gregory, and Hummel, Stan
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- 2000
6. Experiments and CFD simulation of ferrous biooxidation in a bubble column bioreactor
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Mousavi, S.M., Jafari, A., Yaghmaei, S., Vossoughi, M., and Turunen, I.
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- 2008
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7. Optimization of ferrous biooxidation rate in a packed bed bioreactor using Taguchi approach
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Mousavi, S.M., Yaghmaei, S., Jafari, A., Vossoughi, M., and Ghobadi, Z.
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- 2007
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8. Investigating critical parameters for bioremoval of heavy metals from computer printed circuit boards using the fungus Aspergillus niger
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Arshadi, M., primary, Esmaeili, A., additional, and Yaghmaei, S., additional
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- 2020
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9. Bioleaching of low-grade sphalerite using a column reactor
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Mousavi, S.M., Jafari, A., Yaghmaei, S., Vossoughi, M., and Roostaazad, R.
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- 2006
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10. Zinc extraction from Iranian low-grade complex zinc–lead ore by two native microorganisms: Acidithiobacillus ferrooxidans and Sulfobacillus
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Mousavi, S.M., Yaghmaei, S., Vossoughi, M., Jafari, A., and Roostaazad, R.
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- 2006
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11. Influence of Different Nitrogen Sources on Amount of Chitosan Production by Aspergillus niger in Solid State Fermentation
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Vida Maghsoodi, Yaghmaei, S., and Beigi, S. M.
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corn seed residue ,aspergillus niger ,fungus ,technology, industry, and agriculture ,food and beverages ,lcsh:TP155-156 ,macromolecular substances ,equipment and supplies ,lcsh:Chemistry ,soybean residue ,lcsh:QD1-999 ,solid-state fermentation (ssf) ,canola residue ,chitosan ,lcsh:Chemical engineering - Abstract
In this study the effect of different nitrogen source substrates on the amount of chitosan production by Aspergillus niger was investigated. A. niger PTCC 5012 from the Persian Type Culture Collection (PTCC) was grown on soy bean, corn seed and canola residues at 30 °C for specified cultivation days under sterilized conditions. Chitosan was extracted from the fungal mycelia using hot alkaline and acid treatment. The results were shown that soy bean residue at moisture of 37% and 8.40.26 % of nitrogen content produced the highest amount of chitosan (17.0530.95 g/kg of dry substrate), after 12 days of incubation. Corn seed residue produced very low amount of chitosan (1.90.4 % of nitrogen content). The chitosan was analyzed by FTIR spectroscopy and its spectrum was recorded.
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- 2008
12. Bacterial leaching of low-grade ZnS concentrate using indigenous mesophilic and thermophilic strains
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Mousavi, S.M., Yaghmaei, S., Vossoughi, M., Jafari, A., Roostaazad, R., and Turunen, I.
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- 2007
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13. Comparison of bioleaching ability of two native mesophilic and thermophilic bacteria on copper recovery from chalcopyrite concentrate in an airlift bioreactor
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Mousavi, S.M., primary, Yaghmaei, S., additional, Vossoughi, M., additional, Jafari, A., additional, and Hoseini, S.A., additional
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- 2005
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14. Removal of zirconium from aqueous solution by Aspergillus niger.
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Kalantari, H., Yaghmaei, S., Roostaazad, R., and Mohammad-Beigi, H.
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ASPERGILLUS niger ,ZIRCONIUM ,AQUEOUS solutions ,BIOMASS ,LANGMUIR isotherms ,ASPERGILLUS - Abstract
Removal of zirconium from its dilute aqueous solution using Aspergillus niger as a dried and living biomass was investigated. Through that, the effect of some operational parameters on biosorption, including pH, temperature, contact time, initial concentration of zirconium and dose of biomass, were studied. Based on the results, it was concluded that the uptake of zirconium by both dried and living biomasses is pH dependent, and maximum uptake was observed in pH = 3.1 for both biomasses. The maximum uptake capacity of the living biomass was obtained at 30°C. However, the biosorption of zirconium by dried biomass was not affected by temperature. The maximum uptake capacity for living and dried biomasses (78.8 mg/g and 142 mg/g, respectively) was obtained at equilibrium time of 120 min and 30 min, respectively. Equilibrium isotherms showed that adsorption of zirconium by living biomass follows the Freundlich model, and the uptake of dried biomass follows the Langmuir model. Kinetic studies showed that both kinds of biomass follow the second order kinetic model. [ABSTRACT FROM AUTHOR]
- Published
- 2014
15. Biodegradation of heavy fuel oil by newly isolated strain Enterobacter cloacae BBRC10061: Study of unstructured kinetic models and innovative equation.
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Khorasani, A. Chackoshian, Mashreghi, M., and Yaghmaei, S.
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BIODEGRADATION ,ENTEROBACTER cloacae ,HYDROCARBONS ,PETROLEUM products ,COEFFICIENTS (Statistics) - Abstract
Modeling process is very important and valuable to predict process outcome, especially bioprocesses which are intricate. Because of complex hydrocarbon compounds and oscillations happened in the medium of process, biodegradation of mazut has not already been investigated by mathematical models. In this study, an indigenous bacterium was isolated from oil contaminated soil to investigate biodegradation of mazut at different experimental conditions. Data resulted from mazut degradation, pH and electrical potential in the medium were recorded. Some reported kinetic models and combinations were investigated to practically model the process. In addition, a new equation that can predict various phenomena, was applied to functionalize changes of mazut concentration, pH, and electrical potential. Any of the kinetic models did not have potential for modeling behavior of mazut biodegradation at diferent conditions. Opposed to them, the novel equation was able to predict desirable parameter, using two variables and functionalize data by appropriate coefficients. [ABSTRACT FROM AUTHOR]
- Published
- 2013
16. Copper recovery from chalcopyrite concentrate by an indigenous acidithiobacillus ferrooxidans in an air-lift bioreactor
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Seyyed Mohammad Mousavi, Vossoughi, M., Yaghmaei, S., and Jafari, A.
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copper extraction ,lcsh:Chemistry ,acidithiobacillus ferrooxidans ,lcsh:QD1-999 ,air-lift bioreactor ,bioleaching ,lcsh:TP155-156 ,lcsh:Chemical engineering ,sulfide mineral - Abstract
In this study, effects of solid concentration, temperature, and initial Fe2+ concentration on bioleaching of sulfide mineral (chalcopyrite) obtained from Sarcheshmeh Copper Mine in the region of Kerman located in the south of Iran were investigated. A mesophilic iron oxidizing bacterium, Acidithiobacillus ferrooxidans has been isolated from a typical chalcopyrite copper concentrate of the mentioned mine. Bioleaching experiments were carried out in two batch air-lift bioreactors with recycling stream. One reactor contained 2 liters of medium and 10% (v/v) inoculum while in the other reactor, control bioleaching tests were carried out with sterilized concentrate without inoculum by the addition of 40 ml of 0.5% (v/v) formaline in ethanol. The results indicate that the efficiency of copper extraction is dependent on all of the aforementioned variables. In addition, results show that the effects of solid concentration and temperature had more effect compared to the initial Fe2+ concentration. Maximum copper recovery was achieved 70% at pH=1.5, initial Fe2+ concentration=7g/L and pulp density = 10% (w/v) in bioreactor, after 10 days.
17. Zinc extraction from Iranian low-grade complex zinc-lead ore by two native microorganisms: Acidithiobacillus ferrooxidans and Sulphobacillus.
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Mousavi S.M., Jafari A., Roostaazad R., Vossoughi M., Yaghmaei S., Mousavi S.M., Jafari A., Roostaazad R., Vossoughi M., and Yaghmaei S.
- Abstract
Acidithiobacillus ferrooxidans was isolated from a chalcopyrite concentrate from the Sarcheshmeh Cu mine and Sulphobacillus from a sphalerite concentrate from the Kooshk Pb-Zn mine. The effects were studied of various parameters on the bioleaching of a low-grade Zn-Pb ore. The results showed that the Zn extraction efficiency was particularly dependant on temperature and initial Fe(II) concentration. Maximum Zn recovery was achieved using a thermophilic culture. Zinc dissolution reached 58% with Sulphobacillus and 51 % with A. ferrooxidans after 30 days at pH 1.5 and initial Fe(II) concentrations of 7 and 9 g/l, respectively., Acidithiobacillus ferrooxidans was isolated from a chalcopyrite concentrate from the Sarcheshmeh Cu mine and Sulphobacillus from a sphalerite concentrate from the Kooshk Pb-Zn mine. The effects were studied of various parameters on the bioleaching of a low-grade Zn-Pb ore. The results showed that the Zn extraction efficiency was particularly dependant on temperature and initial Fe(II) concentration. Maximum Zn recovery was achieved using a thermophilic culture. Zinc dissolution reached 58% with Sulphobacillus and 51 % with A. ferrooxidans after 30 days at pH 1.5 and initial Fe(II) concentrations of 7 and 9 g/l, respectively.
18. Bioleaching of low-grade sphalerite using a column reactor.
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Mousavi S.M., Jafari A., Roostaazad R., Vossoughi M., Yaghmaei S., Mousavi S.M., Jafari A., Roostaazad R., Vossoughi M., and Yaghmaei S.
- Abstract
The ore from the Kooshk Pb-Zn mine contained sphalerite and pyrite as the main sulphide minerals and chalcopyrite and galena as minor minerals. Tests were carried out using a bench-scale column leach reactor which was inoculated with mesophilic (Acidithiobacillus ferrooxidans) and thermophilic (Sulphobacillus) iron oxidising bacteria initially isolated from the Sarcheshmeh chalcopyrite concentrate and the Kooshk sphalerite concentrate, respectively. The leaching rate of sphalerite tended to increase with dissolved ferric ion concentration. Microscopic counts of bacteria in the solution increased at lower pH ranges. The effect of decreasing particle size on the Zn leaching rate was enhanced at low pH values. Zn dissolution reached 72% and 85% for the mesophilic and thermophilic strains, respectively, after 120 days at column temperatures ranging from 28 to 42 degrees C., The ore from the Kooshk Pb-Zn mine contained sphalerite and pyrite as the main sulphide minerals and chalcopyrite and galena as minor minerals. Tests were carried out using a bench-scale column leach reactor which was inoculated with mesophilic (Acidithiobacillus ferrooxidans) and thermophilic (Sulphobacillus) iron oxidising bacteria initially isolated from the Sarcheshmeh chalcopyrite concentrate and the Kooshk sphalerite concentrate, respectively. The leaching rate of sphalerite tended to increase with dissolved ferric ion concentration. Microscopic counts of bacteria in the solution increased at lower pH ranges. The effect of decreasing particle size on the Zn leaching rate was enhanced at low pH values. Zn dissolution reached 72% and 85% for the mesophilic and thermophilic strains, respectively, after 120 days at column temperatures ranging from 28 to 42 degrees C.
19. Bacterial leaching of low-grade ZnS concentrate using indigenous mesophilic and thermophilic strains.
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Mousavi S.M., Jafari A., Roostaazad R., Turunen I., Vossoughi M., Yaghmaei S., Mousavi S.M., Jafari A., Roostaazad R., Turunen I., Vossoughi M., and Yaghmaei S.
20. Isolation and characterization of oral Actinomyces strain from patients with periodontal disease
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Eshraghi S., Salari MH., Kadkhoda Z., and Yaghmaei Sh.
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Actinomyces- Pleomorphism- Anaerobic- Microaerophilic- Isolation- Gingivitis- Periodontitis- Periodo ,Medicine ,Dentistry ,RK1-715 - Abstract
"nAbstract: Actinomyces species are normal residents of the mouth cavity, gastrointestinal tract and female genital tract. The genus consists of gram-positive bacteria, strictly anaerobic or microaerophilic. The bacteria are opportunists with a low virulence potential that cause actinomycosis only when the normal mucosal barriers are disrupted. The main purpose of this study was the isolation of Actinomyces strains and determining of their role in periodontal diseases. The present study was carried out on 100 patients with periodontal diseases referred to the Periodontic Department of Faculty of Dentistry. The sampling was done in 6 months with isolation of oral Actinomyces from microbial plaque and periodontal pocket. The samples were selected based on the following criteria: periodontal plaque with deep pocket (>3 mm), no antibiotic therapy for a period of at least two weeks, and lack of systemic diseases. One strain of Actinomyces viscosus and two strains of Actinomyces naeslundii were isolated from the patients with gingivitis and periodontitis. Of the 100 patients with gingivitis and periodontitis, aged between 18-57 years old, 46% were males and 54% were females. The peak incidence of the diseases (35%) was in the third age group (31-40) and the lowest incidence (10%) was in the first age group (
- Published
- 2001
21. Roles of Clinical Features and Chest CT in Predicting the Outcomes of Hospitalized Patients with COVID-19 Developing AKI.
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Sabaghian T, Raoufi M, Yaghmaei S, Moradi O, Alavi A, Ebrat Balkhkanlou H, Masbough F, Falsafi A, and Heidari Almasi M
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- Humans, Prognosis, Procalcitonin, Tomography, X-Ray Computed, Retrospective Studies, Risk Factors, COVID-19 complications, Acute Kidney Injury
- Abstract
This research aimed to evaluate the clinical features and computed tomography (CT) scans associated with poor outcomes in COVID-19 patients with acute kidney injury (AKI). A total of 351 COVID-19 patients (100 AKI, 251 non-AKI) hospitalized at Imam Hossein Teaching Hospital affiliated to Shahid Beheshti University of Medical Sciences were included. To investigate the factors associated with in-hospital mortality in COVID-19 patients developing AKI, COX univariate and multivariate regression models were applied after controlling other confounding variables. C-reactive protein CRP, lactate, and procalcitonin levels were significantly higher in AKI patients than in non-AKI patients (P < .05). In addition, AKI patients had higher frequencies of lymphopenia and leukocytosis (P < .05). The troponin levels and WBC were the most significant factors for predicting mortality in patients with AKI. Our findings showed that AKI per se is much more important than any other prognostic factor affecting non-AKI patients. However, AKI patients with higher CRP, PCT, and lactate levels had a poor prognosis. DOI: 10.52547/ijkd.7241.
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- 2023
22. Mucoid impaction of the bronchi (MIB) in a young man with no previous history of hypersensitivity.
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Askari E, Soltani K, Haseli S, and Yaghmaei S
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Mucoid impaction of the bronchi (MIB) is a specific form of proximal bronchiectasis characterized by obstruction and dilation of bronchi usually presented with thick mucoid plug. MIB mostly occurs as the manifestation of a hypersensitivity state in patients with bronchial asthma or in association with allergic bronchopulmonary aspergillosis (ABPA) and clinical overlap between MIB and ABPA can occur. MIB with no history of allergic background is not common and is less reported in the literature. In the following report we discuss a 39-year-old man with no previous history of allergy and atopy who initially presented with fever and shortness of breath. Further assessments demonstrated that the patient had a chronic endobronchial lesion and consolidation of the left lower lobe of the lung. A tissue biopsy reveals no malignant cells. Despite antibiotic therapy, the patient's symptoms persisted, and lobectomy was performed due to no clinical improvement. Even though gross pathology suggested endoluminal impaction, the patient didn't meet the ABPA diagnostic criteria., (© 2022 The Authors. Published by Elsevier Inc. on behalf of University of Washington.)
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- 2022
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23. Validation of Effective Extracellular Vesicles Isolation Methods Adapted to Field Studies in Malaria Endemic Regions.
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Zoia M, Yesodha Subramanian B, Eriksson KK, Ravi MS, Yaghmaei S, Fellay I, Scolari B, Walch M, and Mantel PY
- Abstract
Malaria affects the poorer regions of the world and is of tremendous health and economic burden for developing countries. Extracellular vesicles (EVs) are small vesicles released by almost any cells in the human body, including malaria infected red blood cells. Recent evidence shows that EVs might contribute to the pathogenesis of malaria. In addition, EVs hold considerable value in biomarker discovery. However, there are still significant gaps in our understanding of EV biology. So far most of our knowledge about EVs in malaria comes from in vitro work. More field studies are required to gain insight into their contribution to the disease and pathogenesis under physiological conditions. However, to perform research on EVs in low-income regions might be challenging due to the lack of appropriate equipment to isolate EVs. Therefore, there is a need to develop and validate EV extraction protocols applicable to poorly equipped laboratories. We established and validated two protocols for EV isolation from cell culture supernatants, rodent and human plasma. We compared polyethylene glycol (PEG) and salting out (SA) with sodium acetate for precipitation of EVs. We then characterized the EVs by Transmission Electron Microscopy (TEM), Western Blot, Size-exclusion chromatography (SEC), bead-based flow cytometry and protein quantification. Both protocols resulted in efficient purification of EVs without the need of expensive material or ultracentrifugation. Furthermore, the procedure is easily scalable to work with large and small sample volumes. Here, we propose that both of our approaches can be used in resource limited countries, therefore further helping to close the gap in knowledge of EVs during malaria., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Zoia, Yesodha Subramanian, Eriksson, Ravi, Yaghmaei, Fellay, Scolari, Walch and Mantel.)
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- 2022
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24. Fungal bioleaching of e-waste utilizing molasses as the carbon source in a bubble column bioreactor.
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Nili S, Arshadi M, and Yaghmaei S
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- Bioreactors, Carbon, Metals, Molasses, Electronic Waste analysis
- Abstract
Mobile phones are known as the most widely used electronic instruments, and an enormous number of discarded mobile phones are generated. The present work used a pure culture of Penicillium simplicissimum in a bubble column bioreactor to extract Cu and Ni from mobile phone printed circuit boards (MPPCBs) waste. Molasses was used as an efficient carbon source to enhance bioleaching efficiency and increase the cost benefits. The adaptation phase was done at Erlenmeyer flasks to reach 40 g/L of MPPCBs powder. The most significant parameters, including the mass of MPPCBs powder, aeration, molasses concentration, and their interaction, were optimized in order to leach the maximum possible Cu and Ni using central composite design in response surface methodology (RSM). The model p-values for Cu and Ni recovery were 0.0030 and 0.0348, respectively, emphasizing the model's accuracy. 96.94% of Cu was recovered under 8.8% (v/v) of molasses, aeration rate of 0.29 (l/min), and MPPCBs powder of 10 g/L. The optimized condition of Ni leaching was 1.9% (v/v) of molasses, aeration rate of 0.37 (l/min), and MPPCBs powder of 10 g/L, resulting in 71.51% recovery. The present article demonstrated the great potential of P. simplicissimum to improve metal recovery from e-waste utilizing molasses and bubble column bioreactors., (Copyright © 2022 Elsevier Ltd. All rights reserved.)
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- 2022
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25. Primary Pleural Hemangioendothelioma: A Case Report and Literature Review.
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Askari E, Yaghmaei S, Haseli S, and Pouradollah Totkaboni M
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Epithelioid hemangioendothelioma (EHE) is a rare tumor of the vascular endothelial cells. It can originate from any tissue; however, it occurs most frequently in the liver and lung. Pleural epithelioid hemangioendothelioma (PEH), EHE developing from pleura, is even more infrequent and less reported in the literature. In the following report, we discuss a 40-year-old man who initially presented with right-sided chest pain. Computed tomography revealed pleural thickening and effusion in his right thoracic cavity. PEH diagnosis was confirmed with immunohistochemistry. In order to provide the readers with an inclusive understanding of the disease, we collected the PEH cases reported in the literature. Despite the scarcity of the reported PEH cases (to our best knowledge), the compiled literature review of the disease enables the readers to grasp a better comprehension of the disease., Competing Interests: None., (Copyright © 2021 by S. Karger AG, Basel.)
- Published
- 2021
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26. Fabrication of the macro and micro-scale microbial fuel cells to monitor oxalate biodegradation in human urine.
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Yousefi R, Mardanpour MM, and Yaghmaei S
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- Biodegradation, Environmental, Humans, Monitoring, Physiologic, Organic Chemicals metabolism, Bioelectric Energy Sources, Oxalates metabolism, Oxalates urine
- Abstract
This study presented the fabrication of macro and micro-scale microbial fuel cells (MFCs) to generate bioelectricity from oxalate solution and monitor the biodegradation in a micro-scale MFC for the first time. The maximum generated power density of 44.16 W m
-3 in the micro-scale MFC elucidated its application as a micro-sized power generator for implantable medical devices (IMDs). It is also worthwhile noting that for the macro-scale MFC, the significant amounts of open circuit voltage, oxalate removal, and coulombic efficiency were about 935 mV, 99%, and 44.2%, respectively. These values compared to previously published studies indicate successful oxalate biodegradation in the macro-scale MFC. Regarding critical challenges to determine the substrate concentration in microfluidic outlets, sample collection in a suitable time and online data reporting, an analogy was made between macro and micro-scale MFCs to elicit correlations defining the output current density as the inlet and the outlet oxalate concentration. Another use of the system as an IMD is to be a platform to identify urolithiasis and hyperoxaluria diseases. As a versatile device for power generation and oxalate biodegradation monitoring, the use of facile and cheap materials (< $1.5 per device) and utilization of human excreta are exceptional features of the manufactured micro-scale MFC., (© 2021. The Author(s).)- Published
- 2021
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27. Correction to: The health-related quality of life in Iranian patients with COVID-19.
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Alinia C, Yaghmaei S, Abdullah FZ, Ahmadi A, Samadi N, Pourteimour S, Safari H, Mahmoodi H, Moradi G, and Piroozi B
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- 2021
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28. The health-related quality of life in Iranian patients with COVID-19.
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Alinia C, Yaghmaei S, Abdullah FZ, Ahmadi A, Samadi N, Pourteimour S, Safari H, Mahmoodi H, Moradi G, and Piroozi B
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- Adult, Aged, COVID-19 diagnosis, COVID-19 virology, Cross-Sectional Studies, Female, Health Status, Humans, Iran, Male, Middle Aged, SARS-CoV-2 isolation & purification, Surveys and Questionnaires, COVID-19 psychology, Quality of Life
- Abstract
Background: COVID-19 is a public health emergency with a high mortality rate and it reduces the patient's Health-Related Quality of Life (HRQoL) significantly. This effect is measured in the current study., Methods: In a cross-sectional study in Iran, 320 randomly selected treated patients from COVID-19 were studied. To collect the required data, we applied a questionnaire that included socio-demographic factors, clinical characteristics, and questions on the patients' HRQoL. Time trade-off (TTO) approach was used to measure the lost HRQoL attributed to COVID-19. Besides, we applied a two-limit Tobit regression model to determine the effects of the socio-demographic factors on patients' health utility and the visual analogue scale approach was used to estimate the perceived total current health status., Results: The overall mean (SE) and median (IQR) of the health utility values were 0.863 (0.01) and 0.909 (0.21) respectively. These values for the traders (those who were willing to lose a part of their remaining time of life to avoid the disease) were estimated at 0.793 (0.01) and 0.848 (0.17), respectively. The lowest amount of utility value belonged to the elderly (mean (SE) = 0.742 (0.04); median (IQR) = 0.765 (0.42)) and those living in rural areas (mean (SE)) = 0.804 (0.03); median (IQR) = 0.877 (0.30)). The univariate analysis showed that age, place of residence, and household size had a statistically significant effect on health utility. Moreover, findings of the regression analysis indicated that the participants' age and hospitalization status were the key determinants of COVID-19 health utility value., Conclusion: COVID-19 is associated with a substantial and measurable decrease in HRQoL. This decline in HRQoL can be directly compared with that induced by systemic health states.
- Published
- 2021
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29. Exploring the lived experiences of the suicide attempt survivors: a phenomenological approach.
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Shamsaei F, Yaghmaei S, and Haghighi M
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- Adult, Conflict, Psychological, Female, Grief, Humans, Iran epidemiology, Male, Middle Aged, Qualitative Research, Social Isolation, Social Support, Stress, Psychological, Suicide, Attempted, Survivors psychology
- Abstract
Purpose : Suicide is a complex phenomenon that needs to be studied with a variety of approaches. The purpose of this study is to explore the lived experience of attempted suicide with the phenomenology approach. Method : An interpretive phenomenological approach was used to analyse semi-structured, in-depth interviews with 16 participants (ages 19-57) who were recruited by means of purposive sampling from October to November 2017 at the Farshchian Psychiatric Hospital in Hamadan/Iran. Data analysis was conducted according to van Manen's phenomenological method. Results : Identified three themes and eight subthemes: Mental pain (subthemes: living through grief, internal conflict, the world is better without me), Social challenges (lack of social connection, financial problems, social support services) and Need for love and belonging (feeling understood , need of empathy). Conclusions : Outcomes and key implications of the study related primarily to improving the treatment experiences of suicide attempt survivors and other at-risk population, and also advancing suicide prevention efforts and to provide support for suicide attempt survivors.
- Published
- 2020
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30. Optimized bioleaching of copper by indigenous cyanogenic bacteria isolated from the landfill of e-waste.
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Arab B, Hassanpour F, Arshadi M, Yaghmaei S, and Hamedi J
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- Bacteria, Hydrogen-Ion Concentration, Iran, Waste Disposal Facilities, Copper, Electronic Waste
- Abstract
In this study, indigenous cyanogenic bacterial strains were isolated on nutrient, minimal salt, and soil extract media at various culture conditions from two distinct landfills of e-waste, Iran. Based on their cyanide formation profiles, five most potent isolates were selected for optimization and to this end, the influence of the most effective factors on cyanide production including pH, glycine concentration and temperature were assessed using one-factor at a time method (OFAT). Initial pH of 7, glycine concentration of 2 g/L and temperature of 30°C were obtained as optimal conditions for most of the isolates. Additionally, two bioleaching processes were applied for each bacteria to detect the effect of optimal conditions on bioleaching and to assay their potential in the mobilization of copper. Under optimal conditions and pulp density of 1 g/L, copper recoveries were recorded as 96.73%, 82.49%, 81.17%, 41.72%, and 31.52% by S22, N13, N37, N23, and N41 respectively during 10 days which is approximately 1.5-5 times higher than the recovery obtained without optimization. During the optimization and the bioleaching process, the pH fluctuation of the flasks was monitored which validated the activity of the microorganisms., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2020
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31. Introducing an affordable catalyst for biohydrogen production in microbial electrolysis cells.
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Ghasemi B, Yaghmaei S, Abdi K, Mardanpour MM, and Haddadi SA
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- Bacteria metabolism, Bioelectric Energy Sources microbiology, Carbon chemistry, Catalysis, Electrodes, Electrolysis instrumentation, Hydrogen metabolism, Platinum chemistry, Wastewater chemistry, Wastewater microbiology, Bacteria chemistry, Electrolysis methods, Hydrogen chemistry
- Abstract
This study reports the fabrication of a new cathode electrode assembly using polyaniline (PANI) and graphene on a stainless steel mesh (SSM) as an alternative for the conventional expensive cathode of microbial electrolysis cells (MECs). With respect to the previous efforts to propose an efficient and cost-effective alternative for platinum (Pt) catalysts and cathode electrodes, the present study investigates the assessment of different catalysts to elucidate the potential of the modified SSM cathode electrode for larger-scale MECs. In the case of feeding dairy wastewater to the MEC, the maximum hydrogen production rate and COD removal were obtained by SSM/PANI/graphene cathode and had the values 0.805 m
3 H2 m-3 anolyte day-1 and 82%, respectively, at the applied potential of 1 V. These values were only 20% and 7% lower than those of the MEC with Pt on the carbon cloth cathode, respectively. The coulombic efficiencies of SSM/Pt and SSM/PANI/graphene were seen to be 64.48% and 56.67%, respectively. It was also concluded that the fabrication cost of the modified cathode was 50% lower than the conventional cathodes with Pt on the carbon cloth. Finally, the evaluation of the modified cathode performance was achieved based on Fourier transform infrared spectroscopy, linear sweep voltammetry, scanning electron microscopy, and atomic force microscopy., (Copyright © 2019 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.)- Published
- 2020
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32. Ni and Cu recovery by bioleaching from the printed circuit boards of mobile phones in non-conventional medium.
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Arshadi M, Nili S, and Yaghmaei S
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- Metals, Recycling, Cell Phone, Electronic Waste
- Abstract
There is a substantial volume of mobile phone waste every year. Due to the disadvantages of traditional methods, it is necessary to look for biological processes that are more eco-friendly and economical to recover metals from e-waste. Fungi provide large amounts of organic acids and dissolve metals but using sucrose in the medium is not economical. In this paper, the main objective is to find a suitable alternative carbon substrate instead of sucrose for fungi bioleaching of Ni and Cu in printed circuit boards (PCBs) of mobile phones using Penicillium simplicissimum. Four kinds of carbon sources (including sucrose, cheese whey, sugar, and sugar cane molasses) were selected. Also, pH and number of spores in inoculum were optimized by response surface methodology (RSM) for all carbon sources. The results showed the simultaneous maximum recovery of Cu and Ni is not possible. For Cu recovery, sugar is the best economical and simplistic medium instead of sucrose. Maximum recovery of Cu (90%) gained at the pH of 7, 3.3 × 10
7 spores, and in sugar. The amount of Ni recovery (89%) was highest in molasses, at the pH of 2, and 106 spores. The results proved non-conventional carbon sources improve bioleaching efficiency and the possibility of industrialization., (Copyright © 2019. Published by Elsevier Ltd.)- Published
- 2019
- Full Text
- View/download PDF
33. Silica nanoparticle surface chemistry: An important trait affecting cellular biocompatibility in two and three dimensional culture systems.
- Author
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Hasany M, Taebnia N, Yaghmaei S, Shahbazi MA, Mehrali M, Dolatshahi-Pirouz A, and Arpanaei A
- Subjects
- Alginates chemistry, Biocompatible Materials pharmacology, Cell Culture Techniques, Cell Encapsulation methods, Cell Line, Cell Proliferation drug effects, Cell Survival drug effects, Humans, Hydrogels, Mesenchymal Stem Cells cytology, Mesenchymal Stem Cells physiology, Nanoparticles ultrastructure, Porosity, Silanes chemistry, Silicon Dioxide pharmacology, Static Electricity, Structure-Activity Relationship, Surface Properties, Tissue Engineering methods, Biocompatible Materials chemical synthesis, Mesenchymal Stem Cells drug effects, Nanoparticles chemistry, Silicon Dioxide chemistry
- Abstract
Great advantages bestowed by mesoporous silica nanoparticles (MSNs) including high surface area, tailorable pore diameter and surface chemistry, and large pore volume render them as efficient tools in biomedical applications. Herein, MSNs with different surface chemistries were synthesized and investigated in terms of biocompatibility and their impact on the morphology of bone marrow-derived mesenchymal stem cells both in 2D and 3D culture systems. Bare MSNs (BMSNs) were synthesized by template removing method using tetraethylorthosilicate (TEOS) as a precursor. The as-prepared BMSNs were then used to prepare amine-functionalized (AMSNs), carboxyl-functionalized (CMSNs) and polymeric amine-functionalized (PMSNs) samples, consecutively. These nanoparticles were characterized by scanning electron microscopy, zeta potential measurement, dynamic light scattering, BET (Brunauer, Emmett, Teller) analysis, and FTIR technique. In a 3D culture system, stem cells were encapsulated in alginate hydrogel in which MSNs of different functionalities were incorporated. The results showed good biocompatibility for both BMSNs and AMSNs in 2D and 3D culture systems. For these samples, the viability of about 80% was acquired after 2 weeks of 3D culture. When compared to the control, CMSNs caused higher cell proliferation in the 2D culture; while they showed cytotoxic effects in the 3D culture system. Interestingly, polymeric amine-functionalized silica nanoparticles (PMSNs) resulted in disrupted morphology and very low viability in the 2D cell culture and even less viability in 3D environment in comparison to BMSNs and AMSNs. This significant decrease in cell viability was attributed to the higher uptake values of highly positively charged PMSNs by cells as compared to other MSNs. This up-regulated uptake was evaluated by using an inductively coupled plasma optical emission spectroscopy instrument (ICP-OES). These results uncover different interactions between cell and nanoparticles with various surface chemistries. Building on these results, new windows are opened for employing biocompatible nanoparticles such as BMSNs and AMSNs, even at high concentrations, as potential cargos for carrying required growth and/or differentiation factors for tissue engineering applications., (Copyright © 2019 Elsevier B.V. All rights reserved.)
- Published
- 2019
- Full Text
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34. Acute Appendicitis during Pregnancy; Results of a Cohort Study in a Single Iranian Center.
- Author
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Bazdar S, Dehghankhalili M, Yaghmaei S, Azadegan M, Pourdavood A, Niakan MH, and Bananzadeh AM
- Abstract
Objective: To determine the effects of pregnancy on the presentation, management, surgical and obstetrics outcome of patients with acute appendicitis., Methods: This prospective cohort study was conducted during a 2-year period from 2014 to 2016 in Shahid Faghihi hospital of Shiraz University of Medical Sciences. We enrolled all the pregnant individuals with acute appendicitis who required surgical appendectomy. We also enrolled age-matched controls of non-pregnant women undergoing open appendectomy during the study period. The presentation, clinical and laboratory characteristics, surgical and obstetrics outcomes were determined in both study groups and were further compared between them. In order to determine the determinants of outcome, we also ran a multivariate logistic regression model., Results: Overall we included a total number of 584 patients with presumed appendicitis among whom there were 58 (9.94%) and 526 (90.06%) non-pregnant individuals. The pregnant patients had significantly longer duration of symptoms ( p =0.038), lower temperature ( p =0.026), longer duration of hospital stay ( p =0.026) and higher rate of hospital admission longer than 2 days ( p =0.031). The complications of the surgical procedure were comparable between the two study groups except for the pneumonia which was significantly higher in pregnant patient ( p =0.041). After adjusting for confounders such as age and ethnicity, pregnancy remained significantly associated with lower temperature ( p =0.018), longer symptom duration ( p =0.042) and higher rate of pneumonia ( p =0.049)., Conclusion: Acute appendicitis during the pregnancy was associated with longer duration of symptoms, lower body temperature and higher rate of pneumonia. The pregnancy and neonatal outcomes were comparable to the previously reported data., Competing Interests: None declared.
- Published
- 2018
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35. Characterization of a microfluidic microbial fuel cell as a power generator based on a nickel electrode.
- Author
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Mardanpour MM and Yaghmaei S
- Subjects
- Electrodes, Glucose chemistry, Humans, Nickel chemistry, Bioelectric Energy Sources, Biosensing Techniques methods, Microfluidics methods
- Abstract
This study reports the fabrication of a microfluidic microbial fuel cell (MFC) using nickel as a novel alternative for conventional electrodes and a non-phatogenic strain of Escherichia coli as the biocatalyst. The feasibility of a microfluidic MFC as an efficient power generator for production of bioelectricity from glucose and urea as organic substrates in human blood and urine for implantable medical devices (IMDs) was investigated. A maximum open circuit potential of 459 mV was achieved for the batch-fed microfluidic MFC. During continuous mode operation, a maximum power density of 104 Wm(-3) was obtained with nutrient broth. For the glucose-fed microfluidic MFC, the maximum power density of 5.2 μW cm(-2) obtained in this study is significantly greater than the power densities reported previously for microsized MFCs and glucose fuel cells. The maximum power density of 14 Wm(-3) obtained using urea indicates the successful performance of a microfluidic MFC using human excreta. It features high power density, self-regeneration, waste management and a low production cost (<$1), which suggest it as a promising alternative to conventional power supplies for IMDs. The performance of the microfluidic MFC as a power supply was characterized based on polarization behavior and cell potential in different substrates, operational modes, and concentrations., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2016
- Full Text
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36. Optimization of biomass and biokinetic constant in Mazut biodegradation by indigenous bacteria BBRC10061.
- Author
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Khorasani AC, Mashreghi M, and Yaghmaei S
- Abstract
Optimization based on appropriate parameters can be applied to improve a process. Mazut degradation as a critical issue in environment requires optimization to be efficiently done. To provide biodegradation conditions, experiments were designed on the least interactions among levels of parameters consisting of pH, Tween 80, glucose, phosphorous source, nitrogen source, and time. Kinetic constants and biomass were calculated based on 16 assays, designed using Taguchi method, which constructed various mazut biodegradation conditions. Kinetics of mazut degradation by newly isolated bacteria Enterobacter cloacae closely followed second order kinetic model. Results of the 16 experiments showed that biomass was in the range of 0.019 OD600 to 2.75 OD600, and biokinetic constant was in the range of 0.2 × 10(-5) L/ (mg day) to 10(-4) L/ (mg day). Optimal level for each parameter was obtained through data analysis. For optimal biomass equal to 2.75 OD600, optimal pH, Tween80, glucose, phosphorous source, and time were 8.3, 4 g/L, 4 g/L, 9 g/L, and 10 days, respectively. For biokinetic constant equal to 1.2 × 10(-4) L/ (mg day), optimal pH, Tween80, glucose, phosphorous source, and nitrogen source were 8.3, 1 g/L, 4 g/L, 1 g/L, and 9 g/L, respectively. The optimum levels for biomass and biokinetic constant were the same except the levels of the Tween 80, and phosphorous source. Consequently, mazut may be more degraded with adjusting the conditions on the optimum condition.
- Published
- 2014
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37. Biodegradation of cyanide by a new isolated strain under alkaline conditions and optimization by response surface methodology (RSM).
- Author
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Mirizadeh S, Yaghmaei S, and Ghobadi Nejad Z
- Abstract
Background: Biodegradation of free cyanide from industrial wastewaters has been proven as a viable and robust method for treatment of wastewaters containing cyanide., Results: Cyanide degrading bacteria were isolated from a wastewater treatment plant for coke-oven-gas condensate by enrichment culture technique. Five strains were able to use cyanide as the sole nitrogen source under alkaline conditions and among them; one strain (C2) was selected for further studies on the basis of the higher efficiency of cyanide degradation. The bacterium was able to tolerate free cyanide at concentrations of up to 500 ppm which makes it a good potentially candidate for the biological treatment of cyanide contaminated residues. Cyanide degradation corresponded with growth and reached a maximum level 96% during the exponential phase. The highest growth rate (1.23 × 10(8)) was obtained on day 4 of the incubation time. Both glucose and fructose were suitable carbon sources for cyanotrophic growth. No growth was detected in media with cyanide as the sole carbon source. Four control factors including, pH, temperature, agitation speed and glucose concentration were optimized according to central composite design in response surface method. Cyanide degradation was optimum at 34.2°C, pH 10.3 and glucose concentration 0.44 (g/l)., Conclusions: Bacterial species degrade cyanide into less toxic products as they are able to use the cyanide as a nitrogen source, forming ammonia and carbon dioxide as end products. Alkaliphilic bacterial strains screened in this study evidentially showed the potential to possess degradative activities that can be harnessed to remediate cyanide wastes.
- Published
- 2014
- Full Text
- View/download PDF
38. Agonist and antagonist binding to the nuclear vitamin D receptor: dynamics, mutation effects and functional implications.
- Author
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Yaghmaei S, Roberts C, Ai R, Mizwicki MT, and Chang CE
- Abstract
Purpose: The thermodynamically favored complex between the nuclear vitamin D receptor (VDR) and 1α,25(OH)2-vitamin D3 (1,25D3) triggers a shift in equilibrium to favor VDR binding to DNA, heterodimerization with the nuclear retinoid x receptor (RXR) and subsequent regulation of gene transcription. The key amino acids and structural requirements governing VDR binding to nuclear coactivators (NCoA) are well defined. Yet very little is understood about the internal changes in amino acid flexibility underpinning the control of ligand affinity, helix 12 conformation and function. Herein, we use molecular dynamics (MD) to study how the backbone and side-chain flexibility of the VDR differs when a) complexed to 1α,25(OH)2-vitamin D3 (1,25D3, agonist) and (23S),25-dehydro-1α(OH)-vitamin D3-26,23-lactone (MK, antagonist); b) residues that form hydrogen bonds with the C25-OH (H305 and H397) of 1,25D3 are mutated to phenylalanine; c) helix 12 conformation is changed and ligand is removed; and d) x-ray water near the C1- and C3-OH groups of 1,25D3 are present or replaced with explicit solvent., Methods: We performed molecular dynamic simulations on the apo- and holo-VDRs and used T-Analyst to monitor the changes in the backbone and side-chain flexibility of residues that form regions of the VDR ligand binding pocket (LBP), NCoA surface and control helix 12 conformation., Results: The VDR-1,25D3 and VDR-MK MD simulations demonstrate that 1,25D3 and MK induce highly similar changes in backbone and side-chain flexibility in residues that form the LBP. MK however did increase the backbone and side-chain flexibility of L404 and R274 respectively. MK also induced expansion of the VDR charge clamp (i.e. NCoA surface) and weakened the intramolecular interaction between H305---V418 (helix 12) and TYR401 (helix 11). In VDR_FF, MK induced a generally more rigid LBP and stronger interaction between F397 and F422 than 1,25D3, and reduced the flexibility of the R274 side-chain. Lastly the VDR MD simulations indicate that R274 can sample multiple conformations in the presence of ligand. When the R274 is extended, the β-OH group of 1,25D3 lies proximal to the backbone carbonyl oxygen of R274 and the side-chain forms H-bonds with hinge domain residues. This differs from the x-ray, kinked geometry, where the side-chain forms an H-bond with the 1α-OH group. Furthermore, 1,25D3, but not MK was observed to stabilize the x-ray geometry of R274 during the > 30 ns MD runs., Conclusions: The MD methodology applied herein provides an in silico foundation to be expanded upon to better understand the intrinsic flexibility of the VDR and better understand key side-chain and backbone movements involved in the bimolecular interaction between the VDR and its' ligands.
- Published
- 2013
- Full Text
- View/download PDF
39. Study on biodegradation of Mazut by newly isolated strain Enterobacter cloacae BBRC10061: improving and kinetic investigation.
- Author
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Khorasani AC, Mashreghi M, and Yaghmaei S
- Abstract
Mazut as a source content of various hydrocarbons is hard to be degraded and its cracking could turn mazut into useful materials. Nevertheless degradation of mazut by routine methods is too expensive but application of indigenous microorganisms as biocatalysts could be effective and important to lower the costs and expand its consumption. Mazut biodegradation can be improved using various strategies; Therefore in this study newly isolated strain Enterobacter cloacae BBRC 10061 was used in a method of gradual addition of mazut into medium and its results were compared with simple addition method. To investigate degradation of mazut by BBRC 10061, influence of increase of mazut concentration was assayed based on gradual addition method. Also different kinetic models were used to evaluate kinetics of the process. Results showed that gradual addition method has been a beneficial technique for improvement of mazut degradation because bacterial induction to produce biosurfactant and essential enzymes for cracking mazut was higher during process. Although addition of more mazut increased the rate of biodegradation but percentage of degradation decreased. pH of medium decreased during biodegradation period while electric potential increased. Also the biodegradation kinetics was not fitted with the biokinetic models; therefore kinetics of biodegradation of mazut has to be studied by new models.
- Published
- 2013
- Full Text
- View/download PDF
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