ORIGINAL_ARTICLE
Studies of the Interaction of Ni (II) Complexes Bearing Planar Aromatic Ligands with Calf Thymus DNA
Three Nickel (II) complexes of formula [Ni(en)2](NO3)2(a), [Ni(bpy)2](NO3)2 (b) and [Ni(phen)2](NO3)2(c) (where en = ethylenediamine, bpy = 2,2 bipyridine and phen = 1,10 phenanthroline) were prepared. The structure of these complexes have been characterized by spectroscopic methods such as infrared, ultraviolet visible and nuclear magnetic resonance and conductivity measurements and elemental analysis. Interaction of these three complexes with calf- thymus DNA were carried out using ultraviolet- visible, fluorescence and jell- filterationtachniques. These complexes can denature the DNA at quite low concentrations. Complexes b and c having aromatic surface presumably intercalate in DNA. Moreover complex c can cleave the DNA into two parts and interact with both.
https://www.nsmsi.ir/article_6043_d51326fd4674063b0f2d6139871d749f.pdf
2013-07-23
1
13
Nickel complexes
Interaction with DNA
Intercalation
Zohreh
Esmaeilzaei
hamoon_985@yahoo.com
1
Islamic Azad University, Science & Research Branch, Zahedan, I.R. IRAN
LEAD_AUTHOR
Ali Akbar
Saboury
2
Institute of Biochemistry and Biophysics, University of Tehran, Tehran, I.R. IRAN
AUTHOR
Hasan
Mansouri Torshizi
hmtorshizi@hamoon.usb.ac.ir
3
Department of Chemistry, University of Sistan & Baluchestan, Zahedan, I.R. IRAN
AUTHOR
Maryam
Saeidifar
4
Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Karaj, I.R. IRAN
AUTHOR
Adeleh
Divsalar
5
Department of Biological Sciences, Kharazmi University, Tehran, I.R. IRAN
AUTHOR
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41
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51
ORIGINAL_ARTICLE
Preparation of Nanoporous Poly(Vinylidene Fluoride) Membrane and Consideration of Its Performance
In this research, nanoporous poly(vinylidene fluoride) (PVDF) membrane was prepared via Non-solvent Induced Phase Separation (NIPS) method at solution temperature of 75°C and coagulation bath temperature of 20°C. Also, mechanism of PVDF membrane formation (morphology) and its performance (flux of pure water and rejection efficiency of 7 biological compounds) was investigated. In the formation of this membrane, binodal demixing was dominant mechanism and that crystallization and spinodal decomposition caused to form granular structure at membrane surface and rim of macrovoids. Size of membrane pores was measured by Barett-Joyner-Halenda (BJH) method. This method showed that the size of these membrane pores is in nanoscale (i.e. 18-27 nm). Flux of pure water and rejection of the biological compound of blue dextran at pressure of 200 kPa were for this PVDF membrane 23.60 L/m2h and 92.5% respectively that were measured by the use of ultrfiltration apparatus.
https://www.nsmsi.ir/article_6682_5ad94cdd47fa29a313c66f56ebbb1b63.pdf
2013-07-23
15
29
Poly(vinylidene fluoride)
Phase separation method
Crystallization
Spinodal decomposition
Ultrafiltration
Retention
Arash
Yunessnia Lehi
arash_yunessnia_lehi@yahoo.com
1
Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, I.R. IRAN
LEAD_AUTHOR
Ahmad
Akbari
2
Faculty of Architecture & Art, Department of Carpet, University of Kashan, Kashan, I.R. IRAN
AUTHOR
Majid
Bojaran
3
Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, I.R. IRAN
AUTHOR
[1] Tan X., Tan S.P., Teo W.K., Li K., Polyvinylidene Fluoride (PVDF) Hollow Fibre Membranes for Ammonia Removal from Water, J. Membr. Sci., 271, p. 59 (2006).
1
[2] Khayet M., Matsuura T., Preparation and Characterization of Polyvinylidene Fluoride Membranes for Membrane Distillation, Ind. Eng. Chem. Res., 40, p. 5710 (2001).
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[3] Han L.F., Xu Z.L., Yu L.Y., Wei Y.M., Cao Y., Performance of PVDF/Multi-Nanoparticles Composite Hollow Fibre Ultrafiltration Membranes, Iran. Polym. J., 19, p. 553 (2010).
3
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[5] Cheng L.P., Lin D.J., Shih C.H., Dwan A.H., Gryte C.C., PVDF Membrane Formation by Diffusion-Induced Phase Separation-Morphology Prediction Based on Phase Behavior and Mass Transfer Modeling, J. Polym. Sci. B: Polym. Phys., 37, p. 2079 (1999).
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6
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[30] Gregorio Jr., R., Sousa Borges, D., Effect of Crystallization Rate on the Formation of the Polymorphs of Solution Cast Poly(Vinylidene Fluoride), Polymer, 49, p. 4009 (2008).
30
[31] Mendelsohn J.D., Barrett C.J., Chan V.V., Pal A.J., Mayes A.M., Rubner M.F., Fabrication of Microporous Thin Films from Polyelectrolyte Multilayers, Langmuir, 16, p. 5017 (2000).
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[35] Yuan Z., Dan-Li X., Porous PVDF/TPU Blends Asymmetric Hollow Fiber Membranes Prepared with the Use of Hydrophilic Additive PVP (K30), Desalination, 223, p. 438 (2008).
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[37] Rajesh S., Senthilkumar S., Jayalakshmi A., Nirmala M.T., Ismail A.F., Mohan D., Preparation and Performance Evaluation of Poly (Amide-Imide) and TiO2 Nanoparticles Impregnated Polysulfone Nanofiltration Membranes in the Removal of Hhumic Substances, Collo. Surf. A: Physicochem. Eng. Aspects, 418, p. 92 (2013).
37
[38] Han B., Zhang D., Shao Z., Kong L., Lv S., Preparation and Characterization of Cellulose Acetate/Carboxymethyl Cellulose Acetate Blend Ultrafiltration Membranes, Desalination, 311, p. 80 (2013).
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39
[40] Leo C.P., Linggawati A., Mohammad A.W., Ghazali Z., Effects of γ-Aminopropyltriethoxylsilane on Morphological Characteristics of Hybrid Nylon-66-Based Membranes Before Electron Beam Irradiation, J. Appl. Polym. Sci., 122, p. 3339 (2011).
40
ORIGINAL_ARTICLE
Investigation of the Effects of Suspension Agents on Particle Size Distribution in Suspension Polymerization of Styrene
Suspension polymerization of styrene is an important way to produce polystyrene and expandable polystyrene. In this process, water is used as continues aqueous phase and styrene with additives like initiators are dispersed by agitator. Organic and inorganic stabilizers are used alone or together to stabilize suspension. Viscosity of monomer droplet increases as conversion increases during polymerization. Mean particle size and its distribution of polymer particles are key parameters that should be controlled. We used TCP, HEC and PVA to control these parameters in pilot scale reactor in Tabriz petrochemical complex. This research shows that, we should use more TCP than PVA to produce commercial size of EPS. HEC can't stabilize dispersion. But when we use suspension agents together, HEC and TCP show great results. The influence of HEC on particle size distribution is more than PVA. There is no pollution inside reactor when we use TCP. But it is necessary to use optimum amount of PVA to produce less pollution and more commercial size of EPS.
https://www.nsmsi.ir/article_6683_a5a09f55bdfcb144569e221004ba1f39.pdf
2013-07-23
31
39
Ali
Hamzehzadeh Germi
1
Tabriz Petrochemical Company (T.P.C), Tabriz, I.R. IRAN
AUTHOR
Abdullah
Samiee Beirag
a_samiee2003@yahoo.com
2
Iranian Academic Center for Education, Culture and Research (ACECR), Amirkabir University of Technology Branch, Tehran, I.R. IRAN
LEAD_AUTHOR
Mohammad
Samiepoor Giri
3
Islamic Azad University, North Tehran Branch, Tehran, I.R. IRAN
AUTHOR
Nasrollah
Majidian
4
Islamic Azad University, North Tehran Branch, Tehran, I.R. IRAN
AUTHOR
[1] Peter Svec, "Styrene-Based Plastics and Their Modification", John Wiley & Sons Canada, (1991).
1
[2] Snijders E.J., "Water Expandable Polystyrene (WEPS): Computational and Experimental Analysis of Bubble Growth", PhD Thesis, Einhoven University of Technology, chap 1, Endhoven University Press (2003)
2
[3] ادیان، جرج؛ ترجمه مهندس حسین سعیدیان و مهدی وفائیان،" اصول بسپارش"، ص 218-207 ، ص 332-329، چاپ دوم، مرکز نشر دانشگاهی، (1981).
3
[4] Scheirs J., Periddy D., "Modern Styrenic Polymers Polystyrenes and Styrenic Copolymers", John Wiley & Sons Canada, pp.170-180 (2003).
4
[5] Machando R.A.F., Pinto J.C., Arajo P.H.H., Bolzan A., Mathematical Modeling of Polystyrene Particle Size Distribution Produced by Suspension Polymerization, Braz. J. Chem. Eng., 17, (2000).
5
[6] Villalobos M.A., Hamielec A.E., Wood Ph.E., Bulk and Suspension Polymerization of Styrene in Presence of n-Pentane. An Evaluation of Monofunctional and Bifunctional Initiation, Journal of Applied Polymer Science, 50(327), (1993).
6
[7] Gonçalves O.H., Nogueira A.L., Schilischting R., Coan T., Sanches A.A.F., Machado R.A.F., Methyl Methacrylate Suspension Polymerization: Strategies on Particle size Distribution ,2nd Mercosur Congress on Chemical Engineering, Rio de Janeiro, (2005).
7
[8] Mendizabal E., Castellanos-Ortega J.R., Puig J.E., A Method for Selecting Polyvinyl Alcohol as Stabilizer in Suspension Polymerization, Colloids and Surfaces, 63, p. 209 (1992).
8
[9] Fatemeh jahanzad, Shahriar Sajjadi, Brain W. Brooks, On the Evoluation of Particle Size and Distribution in Suspension Polymerization, Macromol. Symp., Canada, p. 255 (2004).
9
[10] Mikko Kono, Kunio Arai, Shozaburo Satio, The Effect of Stabilizer on Coalescence of Dispersed Drops in Suspension Polymerization of Styrene, Journal of Chemical Engineering of Japan, 15(2), p. 131 (1982).
10
[11] Holmberg K., Gonsson B., and Linfdman B., "Surfactants and Polymer in Aqueous Solution", 2nd ed., pp. 357-387, Wily and sons, England, (2002).
11
ORIGINAL_ARTICLE
Investigation of Low Concentrations R22 on Methane Hydrate Formation Kinetics
In this work the effect of R22 on methane hydrate formation rate is investigated. R22 and methane are in gas phase. With adding R22 in gas phase the methane hydrate formation rate is increased. Experiments were done at R22 concentrations of 0, 162, 5550, 16000 and 29500 ppm. The results show the initial rate of methane hydrate formation is increased between 36% - 64 % and the required time for reaching to the equilibrium pressure is decreased with increasing the concentration of R22. Also induction time is decreased in due to encaging R22 in hydrate phase, because with encaging R22 in hydrate phase the equilibrium pressure is decreased and driving force for methane hydrate formation is enhanced.
https://www.nsmsi.ir/article_6684_80ce33d3c6321fb3985ec01213f494c1.pdf
2013-07-23
41
45
Methane
R22
Gas hydrate
Induction time
Hydrate formation kinetics
Sedigheh
Parsamehr
1
School of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, I.R. IRAN
AUTHOR
Farshad
Varaminian
fvaraminian@semnan.ac.ir
2
School of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, I.R. IRAN
LEAD_AUTHOR
Hadi
Roosta
3
School of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, I.R. IRAN
AUTHOR
Bahman
Tohidi
4
Centre for Gas Hydrate Research, Institute of Petroleum Engineering, Heriot-Watt University, SCOTLAND
AUTHOR
[1] Sloan E.D., "Clathrate Hydrates of Natural Gases", 3 rd ed., Taylor & Francis, New York, (2008).
1
[2] کرم الدین، مریم؛ ورامینیان، فرشاد؛ مقایسه کارایی قانونهای اختلاط در پیش بینی تعادل فازی هیدرات گازی با استفاده از معادله حالت SW، نشریه شیمی و مهندسی شیمی ایران، (4)29، ص. 77 (1389).
2
[3] ملک علایی، مهدی؛ ورامینیان، فرشاد؛ تحلیل پایداری هیدرات گازی و محاسبه تبخیر ناگهانی چند جزیی ـ چند فازی، نشریه شیمی و مهندسی شیمی ایران، (1)28، ص. 139 (1388).
3
[4] Makogon Y.F., "Hydrates of Hydrocarbons", Pennwell Publishing Co. Oklahoma, (1997).
4
[5] Carroll J., “Natural Gas Hydrate A Guide for Engineers", 1th ed., Elsevier Science and Technology Books, New York, (2002).
5
[6] Okutani K., Kuwabara Y., Mori Y.H., Surfactant Effects on Hydrateformation in an Unstirred Gas/Liquid System: An Experimental Study Using Methane Andsodium Alkyl Sulfates, Chemical Engineering Science, 63, p. 183 (2008).
6
[7] Profio P.Di, Arca S., Germani R., Savelli G., “Surfactant Promoting Effects on Clathratehydrate Formation: Are Micelles Really Involved?, Chemical Engineering Science, 60, p. 4141 (2005).
7
[8] Roosta H., “The Effect of Additives on S I and S II Hydrate Formation Kinetic”, MS. Thesis, Semnan University, (2012).
8
[9] Zhang C.S., Fan S.S., Liang D.Q., Guo K.H., Effect of Additives on Formation of Natural Gas Hydrate, Fuel, 83, p. 2115 (2004).
9
[10] Watanabe K., Imai S., Mori Y.H., Surfactant Effects on Hydrateformation in an Unstirred Gas/Liquid System: An Experimental Study Using HFC-32 Andsodium Dodecyl Sulfate, Chemical Engineering Science 60, p. 4846 (2005).
10
[11] Mooijer-van den Heuvel M.M., Witteman R., Peters C.J., Phase Behaviour of Gas Hydratesof Carbon Dioxide in the Presence of Tetrahydropyran, Cyclobutanone, Cyclohexane Andmethylcyclohexane, Fluid Phase Equilibria, 182, p. 97 (2001).
11
[12] Ganji H., Manteghian M., Rahimi Mofrad H., Effect of Mixed Compounds on Methane Hydrate Formation and Dissociation Rates and Storage Capacity, Fuel Processing Technology, 88, p. 891 (2007).
12
[13] Max M.D., "Economic Geology of Natural Gas Hydrate", MDS Research & Hydrate Energy International. St. Petersburg, FL, U.S.A., Springer, (2003).
13
[14] Mafakheri K., "An Experimental Study on Thermodynamics and Formation Kinetics of Hydrates of Refrigerants", MS Thesis, Semnan University, (2010).
14
[15] Parsamehr S., "The Use of Tracer to Predict Formation of the Gas Hydrate in Pipelines", MS Thesis, Semnan University, (2012).
15
ORIGINAL_ARTICLE
Exergy Analysis of Combined Fluidized-Fix Bed Dryer
Exergy analysis is one method for studying of energy efficiency and optimization for systems and machines including dryers. Fluidized bed dryers despite widespread usage have low energy efficiency. Therefore a new method has been proposed that the fluid bed drying has been combined with thick (fix) bed dryer as outlet air from the fluidized bed section is conducted to the thick bed section for drying the other material or same kind material that existed in the first section. Experiments were performed in three temperatures, 50, 60 and 70 °C and three bed depth in down, fluidized bed drying, 4, 6 and 8 cm and two beds depth in up, batch bed drying, 6 and 8 cm. The results show that exergy loss of top floor is lower than down floor. And also increasing in bed depth of down floor causes increasing in exergy loss of top floor, but exergy loss of down floor decreases with increasing in bed depth of top floor.
https://www.nsmsi.ir/article_6685_2517e151088afb20830ee1daa3af48ec.pdf
2013-07-23
47
55
Exergy
energy
Fix bed
Fluidized
Dryer
Vahid
Vartehparvar
vartehparvar@gmail.com
1
Department of Agrotechnology, College of Aburaihan, University of Tehran, Tehran, I.R. IRAN
LEAD_AUTHOR
Mohammad Hossein
Kianmehr
2
Department of Agrotechnology, College of Aburaihan, University of Tehran, Tehran, I.R. IRAN
AUTHOR
Akbar
Arabhosseini
3
Department of Agrotechnology, College of Aburaihan, University of Tehran, Tehran, I.R. IRAN
AUTHOR
Sayed Reza
Hasan-Beygi
4
Department of Agrotechnology, College of Aburaihan, University of Tehran, Tehran, I.R. IRAN
AUTHOR
[1] Cengel A. Y., Boles M.A., “Thermodynamics an Engineering Approach”, 5th ed., p.442, McGraw-Hill College, Boston, (2006).
1
[2] پهلوانزاده، ح.؛ قائم مقامی، ف.، تعیین اثر تعداد سینیهای توزیع کننده ماده خشک شونده بر میزان بهینهسازی مصرف انرژی درخشک کن های بسترسیال، نشریه شیمی و مهندسی شیمی ایران، (4) 28، ص.81 (1388).
2
[3] Midilli A., Kucuk H., Energy and Exergy Analyses of Solar Drying Process of Pistachio, Energy, , p.539 (2003).
3
[4] Akpinar E.K., Energy and Exergy Analyses of Drying of Red Pepper Slices in A Convective Type Dryer, International Communication in Heat And Mass Transfer, 31, p. 1165 (2004).
4
[5] Ceylan I., Aktas M., Dogan H., Energy and Exergy Analysis of Timber Dryer Assisted Heat Pump, Applied Thermal Engineering, 27, p. 216 (2007).
5
[6] Aghbashlo M., Kianmehr, M. H., Arabhosseini A., Energy and Exergy Analyses of Thin-Layer Drying of Potato Slices in a Semi-Industrial Continuous Band Dryer, Drying Technology, 26(12), p. 1501 (2008).
6
[7] Nazghelichi T., Kianmehr M. K., Aghbashlo M., Thermodynamic Analysis of Fluidized Bed Drying of Carrot Cubes, Energy, 35(1), p. 4679 (2010).
7
[8] Corzo O., Bracho N., Vasquez, A., Pereira, A., Energy and Exergy Analysis of Thin Layer Drying of Coroba Slices, Journal of Food Engineering, 86, p.151 (2008).
8
ORIGINAL_ARTICLE
Determination of Safe Distance for Sour Gas Pipelines Based on Quantitative Risk Assessment
One of the most important methods of gas transmission is using of pipelines. Regards to that most of gas transmission pipelines is in residential areas, the safety consideration for pipelines is very important. In this study, determination of safe distance for sure gas pipelines has been studied. The case study is a sure gas pipeline in BUSHEHR province. Using PHAST RISK software and regards to quantitative risk assessment, safe distance for this pipeline in four wall thickness has determined and the results showed that effects of 2 millimeter change in wall thickness can change safe distance about 60 meter.
https://www.nsmsi.ir/article_6714_01b71b46d744b9e45c049786aa8dd4b6.pdf
2013-07-23
57
71
Pipeline
sour gas
Safe distance
Mojtaba
Bagheri
1
Faculty of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRAN
AUTHOR
Naser
Badri
2
Faculty of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRAN
AUTHOR
Davood
Rashtchian
rashtchian@sharif.edu
3
Faculty of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, I.R. IRAN
LEAD_AUTHOR
Hooshang
Eghbalian
4
National Iranian Gas Company, Tehran, I.R. IRAN
AUTHOR
[1] Hopkins P., Fletcher R., Palmer-Jones R., "A Method for the Monitoring and Management of Pipeline Risk – A Simple Pipeline Risk Audit (SPRA)", Andrew Palmer and Associates, UK, (1999).
1
[2] "Steel Pipeline for High Pressure Gas Transmission", The Institution of Gas Engineering, London, IGE/TD/1 Edition 3, (1993).
2
[3] Jo Y.D., Ahn B.J., Analysis of Hazard Areas Associated with High-Pressure Natural-Gas Pipelines, Journal of Loss Prevention in the Process Industries, 15, p. 179 (2002).
3
[4] Joaquim Casal, "Evaluation of the Effects and Consequences of Major Accidents in Industrial Plants", Industrial Safety Series, Elsevier, UK, 8 (2008).
4
[5] رفیعی، احمد؛ وطنی، علی؛ "حریم ایمن خط لوله انتقال گاز ترش عسلویه ـ آغاجاری" دومین همایش ملی مهندسی ایمنی و مدیریت HSE دانشکده مهندسی شیمی و نفت دانشگاه صنعتی شریف 16-14 اسفند (1386).
5
[6] American National Standards Institute Standard: "Z37.2-1972. Acceptable Concentrations of Hydrogen Sulfide", John Wiley, New York (1998).
6
[7] دستورالعمل ارزیابی اثرهای محیط زیستی خطوط لوله انتقال نفت و گاز، معاونت امور مهندسی و ساخت داخل، (1386).
7
[8] Ukopa Pipeline Fault Database, "4th Report of the UKOPA Fault Database Management Group, Advantica Report Reference: R 8099 (2005).
8
[9] Guidelines for Consequence Analysis of Chemical Releases", CCPS, Effect Models, American Institute of Chemical Engineers (1999).
9
[10] Hopkins ph., Goodfellow G., Ellis R., Haswell J., Jackson N., "Pipeline Risk Assessment: New Guidelines", Penspen Integrity Virtual Library, (2009).
10
ORIGINAL_ARTICLE
Computer Simulation of Clinker Grinding Circuits of Ardabil Cement Plant
Multi-compartment tube mills in closed circuit with air separators are widely used for clinker grinding in cement plants. Ardabil cement plant which produces a pozzolanic type of cement is also using such closed grinding circuits for comminution of clinker, pozzolan and gypsum mixtures with specific ratios to produce cement powder. To simulate grinding circuits of this plant, a large number of samples were collected from various existing streams. In addition, samples were collected from inside of the mills at evenly spaced locations on their longitudinal axis. Then, particle size distribution of samples were determined using sieve analysis and laser diffraction methods and were mass balanced using streams flow rates. The work index and breakage distribution function of mill feed (mixture of clinker, pozzolan and gypsum) were determined in laboratory. These data were used for calibration of simulation models. For circuit simulations, BMCS (BMCS-based Modular Comminution Simulator) software was used which is capable of simulating various comminution circuits. In this article, mathematical models of ball mill and efficiency curve were used for simulation of tube mills and efficiency curve for simulation of air separators. BMCS program for simulation of tube mills uses a population balance model for mathematical description of breakage process and tanks-in-series model for mathematical description of residence time distribution.Also, for simulation of diaphragms and air separator BMCS uses Whiten model for mathematical description of efficiency curve. Whiten model parameters were determined using GA toolbox of MATLAB software. Close agreement between simulation results and actual data indicate accuracy of sampling procedure, validity of models and their calibration and accuracy of predictions made by simulator.
https://www.nsmsi.ir/article_6715_1a33a28e28e48bf6a64247c4bc1f551b.pdf
2013-07-23
73
81
Tube mill
Modelling and simulation
Ardabil cement plant
BMCS
Farzanegan, Akbar
Farzanegan
farzanegan@ut.ac.ir
1
School of Mining, College of Engineering, University of Tehran, P.O. Box: 11155-4563 Tehran, I.R. IRAN
LEAD_AUTHOR
Ebrahim
Ghasemi Ardi
2
School of Mining, College of Engineering, University of Tehran, P.O. Box: 11155-4563 Tehran, I.R. IRAN
AUTHOR
Ali Reza
Valian
3
Department of Mining, Faculty of Engineering, University of Kashan, Kashan, I.R. IRAN
AUTHOR
Vahid
Hasanzadeh
4
School of Mining, College of Engineering, University of Tehran, P.O. Box: 11155-4563 Tehran, I.R. IRAN
AUTHOR
[1] Özer C.E., Ergün S.L.A., Benzer H., Modeling of the Classification Behavior of the Diaphragms Used in Multi-Chamber Cement Mills, International Journal of Mineral Processing, 80(1), p. 58 (2006).
1
[۲] فرزانگان، اکبر؛ مدلسازی ریاضی و شبیهسازی کامپیوتری آسیاهای لولهای چندخانهای، گزارش طرح پژوهشی، دانشگاه کاشان (۱۳۸۳).
2
[3] Farzanegan A., Valian A., Simulation of Cement Grinding Circuits by BMCS, Proc. of International Mining Congress, October, 18-21, Tehran, Iran (2010).
3
[4] Farzanegan A., "Knowledge-Based Optimization of Mineral Grinding Circuits", Ph.D. Thesis, Department of Mining and Metallurgical Engineering, McGill University, Montreal, Canada (1998).
4
[5] Benzer H., Ergun L., Öner M., Lynch A.J., Simulation of Open Circuit Clinker Grinding, Minerals Engineering, 14(7), p. 701 (2001).
5
[6] Genç Ö., Benzer A.H., Horizontal Roller Mill (Horomill) Application Versus Hybrid HPGR/Ball Milling in Finish Grinding of Cement, Minerals Engineering, 22(15), p. 1344 (2009)
6
[7] Dundar H., Benzer H., Aydoğan N.A., Altun O, Toprak A.N., Ozcan A., Eksi D., Sargın A., Simulation Assisted Capacity Improvement of Cement Grinding Circuit: Case Study, Cement Plant, Minerals Engineering, 24(3-4), p. 205 (2011).
7
[8] Aydoğan N.A., Benzer H., Comparison of the Overall Circuit Performance in the Cement Industry: High Compression Milling vs. Ball Milling Technology. Minerals Engineering, 24(3-4), p. 211 (2011).
8
[9] Altun O., Benzer H., Dundar H., Aydoğan N.A., Comparison of Open and Closed Circuit HPGR Application on Dry Grinding Circuit Performance, Minerals Engineering, 24(3-4), p. 267 (2011).
9
[10] Napier-Munn T.J., Morrell S., Morrison R.D., Kojovic T., “Mineral Comminution Circuits; Their Operation and Optimisation”, JKMRC Monograph Series in Mining and Mineral Processing, No. 2, Jullius Kruttschnitt Mineral Research Center, Australia (1996).
10
[11] Lynch A.J., Öner M., Benzer H., Simulation of a Closed Cement Grinding Circuits, ZKG International, 10, p. 560 (2000).
11
[۱۲] یوسفی، علیاصغر؛ فرزانگان، اکبر؛ ایراننژاد، مهدی؛ معرفی نرمافزار BFDS برای تعیین تابع شکست مواد معدنی؛ مجموعه مقالات سومین کنفرانس دانشجویی مهندسی معدن، دانشگاه صنعتی امیرکبیر (۱۳۸۱).
12
ORIGINAL_ARTICLE
Comparison between a Moving Bed Membrane Bioreactor and a Conventional Moving Bed Biofilm Reactor (MBBR)
The combination of moving bed biofilm reactors and membrane bioreactors can compensate for the drawbacks of both of these systems and further increase their acceptance and application in wastewater treatment industries. The objective of this study is comparison between a moving bed membrane bioreactor and a conventional Moving Bed Biofilm Reactor (MBBR).The study was carried out using a hollow fiber microfiltration membrane. The pilot plant consisted of two separated 30 liters reactors with KMT carriers, one with membrane and one without it. The carrier filling fraction was 40%. The synthetic wastewater contained molasses and other salts as nutrient source. The COD of the feed was in three various concent ratios (500-1000-2000 mg/L) with different hydraulic retention times (10-15-20 hr) which responds to organic loading rates between 0.6-4.8 (kgCOD / m3d). The removal efficiency of COD for permeate was 92-98%, for biological treatment in the reactor was 89-96% and for conventional MBBR was 87-96%. The MLSS content increased from 4000 to 9230 in the reactor with membrane and decreased from 4000 to 2450 in the conventional MBBR.
https://www.nsmsi.ir/article_6716_045f8454296be63c2fc23646d15ba7a8.pdf
2013-07-23
83
91
Moving bed biofilm reactor
Hollow fiber membrane
membrane bioreactor
COD removal
Bahareh
Moshtagh
baharemoshtagh@gmail.com
1
Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, I.R. IRAN
LEAD_AUTHOR
Seyed Mehdi
Borghei
mborghei@sharif.ir
2
Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, I.R. IRAN
AUTHOR
Elham
Ashrafi
elham.ashrafi1985@gmail.com
3
Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, I.R. IRAN
AUTHOR
Jalil
Shadbahr
4
Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, I.R. IRAN
AUTHOR
[1] Davies W.J., Le M.S., Heath C.R., Intensified Activated Sludge Pprocess with Submerged Membrane Microfiltration, Water Sci. Technol., 38 (4–5), p. 421(1998).
1
[2] Simon Judd," The MBR Book, Principles and Applications of Membrane Bioreactors in Water and Wastewater Treatment", Elsevier, Oxford, )2006).
2
[3] Stephenson T., Judd S., Jefferson B., Brindle K., "Membrane Bioreactor for Wastewater Treatment", IWAPublishing, UK, (2000).
3
[4] Odegard H., Rusten B., Westrum T., A New Moving Bed Biofilm Reactor - Application and Results, Wat. Sci. Tech., 29 (10-11), p. 157 (1994).
4
[5] Aygun A., Nas B., Berktay A., Influence of High Organic Loading Rates on COD Removal and Sludge Production in Moving Bed Biofilm Reactor, Environmental Engineering Science, 25 (9), p.1311 (2008).
5
[6] Rusten B., Upgrading to Nitrogen Removal with KMT Moving Bed Biofilm Reactor, Wat. Sci. Tech., 29 (12), p. 185 (1994).
6
[7] Metcalf & Eddy "Wastewater Engineering, Treatment, Disposal, and Reuse" Revised by George Tchobanoglouse, McGrow-Hill, Fourth edition, (2003).
7
[8] Rusten B., McCoy M., Proctor R., Siljudalen J.G., The Innovative Moving Bed Biofilm Reactor/Solids Contact Reaeration Process for Secondary Treatment of Municipal Wastewater, Water Environment Research, 70 (5), p. 1083 (1998).
8
[9] Borghei S.M., Hosseini S.H., The Treatment of Phenolic Waste Water Using a Moving Bed Biofilm Reactor, Process Biochemistry, 39, p. 1177 (2004)
9
[10] APHA, AWWA and WPCF, "Standard Method for the Examination Water and Waste Water", Washington DC, American Public Health Association, USA (1998).
10
ORIGINAL_ARTICLE
Optimization of Cultural Condition to Improve Recombinant C-D Fragment of Bacteriorhodopsin Production in E.coli
At present study, a C-D fragment of bacteriorhodopsin (BR) in recombinant E. coli was expressed. BR mutant gene was synthesized by consideration of E. coli codon usage. The synthesized gene was cloned in pET21a+ expression plasmid at Nde I and Hind III restriction sites and expressed under T7 promoter successfully. The expressed protein was analyzed by SDS-PAGE. The effect of temperature (A), induction time (B) and the process time after induction (C), on the protein expression yield (the amount of product per unit dry cell mass) were screened using Yates table analysis. Three factors of A, B and C were significant and optimized by Taguchi method. The optimized condition was as: temperature 37 0C, induction time at OD600= 0.7 and the process time after induction 4 h. Also, the predicted protein production at optimized condition was 21.54% of total protein. Using the gained optimum condition, the effect of amino acid addition on expression level of recombinant C-D fragment of BR and bacterial growth in E.coli, using M9 culture medium was also investigated. Yates table analysis showed that Threonine, Leucine and Alanine are more effective and so were selected for addition to the culture medium in the fermentor, at two different levels. The results showed that amino acid addition caused increasing in the desired protein productivity, but had little effect on the bacterial growth.
https://www.nsmsi.ir/article_6752_223f810b1866ba4169b465cb8ca42f0f.pdf
2013-07-23
93
101
E. coli
Bacterirhodopsin
C-D fragmen
Optimization
Recombinant protein
Sirvan
Khancherzar
1
Biotechnology Group, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114 Tehran, I.R. IRAN
AUTHOR
Sameereh
Hashemi Najafabadi
s.hashemi@modares.ac.ir
2
Biotechnology Group, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114 Tehran, I.R. IRAN
LEAD_AUTHOR
Jaafar
Mohammadian Moosa-Abadi
3
Biotechnology Group, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114 Tehran, I.R. IRAN
AUTHOR
Rasoul
Khalilzadeh
4
Biotechnology Group, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114 Tehran, I.R. IRAN
AUTHOR
Eshandiar, Samaneh
Eshandiar
5
Biotechnology Group, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114 Tehran, I.R. IRAN
AUTHOR
[1] Jong H.C., Ki C.K., Sang Y.L., Production of Recombinant Proteins by High Cell Density Culture of Escherichia coli, Chem Eng Sci., 61, p.876 (2006).
1
[2] Baneyx F., Recombinant Protein Expression in E.coli, Curr. Opin. Biotechnol., 10, p.411 (1999).
2
[3] Morten L.C., Niels T.E., Growth and Proton Exchange in Recombinant Escherichia coli BL21, Enzyme Microb. Technol., 31, p. 566 (2002).
3
[4] Jin Y., Girshevitz O., Friedman N., Ron I., Cahen D., Sheves M., Covalent Attachment of Bacteriorhodopsin Monolyer to Bromo-terminated Solid Supports: Preparation, Characterization, and Protein Stability, Chem Asian J., 3, p.1146 (2008).
4
[5] Luneburg J., Widmann M., Dathe M., Marti T., Secondary Structure of Bacteriorhodopsin Fragments, J. Biol. Chem., 273, p.28822 (1998).
5
[6] Nekrasova O.V., Wulfson A.N., Tikhonov R.V., Yakimov S.A., Simonova T.N., Tagvey A.I., Dolgikh D.A., Ostrovsky M.A., Kirpichnikov M.P., A New Hybrid Protein for Production of Recombinant Bacteriorhodopsin in Escherichia Coli, J. Biotechnol., 147, p.145 (2010).
6
[7] Xu J., Bhattacharya P., Varo G., Monolithically Integrated Bacterio- rhodopsin/semi-conductor Opto-electronic Integrated Circuit for a Bio-photoreceiver, Biosens Bioelectron., 19, p.885 (2004).
7
[8] Pompejus M., Friedrich K., Teufel M., Fritz H.J., High-Yield Production of Bacteriorhodopsin via Expression of a Synthetic Gene in Escherichia coli, Eur. J. Biochem., 211, p. 27 (1993).
8
[9] Lee S.Y., Chang H.N., Um Y.S., Hong S.H., Bacteriorhodopsin Production by Cell Recycle Culture of Halobacterium Halobium, Biotechnol Lett., 20, p.763 (1998).
9
[10] Xu J., Stickrath A.B., Bhattacharya P., Nees J., Varo G., Hillebrecht J.R., Ren L., Birge R.R., Direct Measurement of the Photoelectric Response Time of Bacteriorhodopsin via Electro-Optic Sampling, Biophys. J., 85, p.1128 (2003).
10
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ORIGINAL_ARTICLE
Optimization of Surfactin Production by Bacillus subtilis NLIM 0110 in Shake Flask
In this research, biosurfactant production (surfactin) by Bacillus subtilis NLIM 0110 has been investigated. This microorganism was isolated from agricultural area of Iran. For surfactin production, the best condition of biosurfactant in shake flask was obtained at 37°C and 250 rpm. In this condition, maximum production of biomass and biosurfactant are 4 and 1.8 g/L. The yield of biosurfactant on biomass (Yp/x), biosurfactant on sucrose (Yp/s), and the volumetric production rate (Y) for shake flask were obtained about 0.45 g/g, 0.18 g/g, and 0.03 g/L.h, respectively. For this microorganism, the production of biosurfactant was proportional to the cell growth representing biosurfactant as a growth-associated product. The produced surfactin showed good surface activity because it is able to reduce the surface tension from 72 mN/m to 25 mN/m. Therefore, the proposed biosurfactant is appropriate candidate for industrial applications.
https://www.nsmsi.ir/article_6753_283b734c58ce91a0165e5955d9bcba38.pdf
2013-07-23
103
109
Biosurfactant
Bacillus subtilis
Surface tension
Surfactin
Optimization
Hossein
Amani
hosn1_amani@yahoo.com
1
Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, I.R. IRAN
LEAD_AUTHOR
Farzaneh
Shahmirzaei
2
School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN
AUTHOR
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