نتایج جستجو برای: solution concentration

تعداد نتایج: 814854  

Journal: :Investigative ophthalmology & visual science 1990
M Araie K Hamano S Eguchi S Matsumoto

The effect of free Ca2+ ion concentration on the integrity of the barrier function of the corneal endothelium was studied using the endothelial permeability to carboxyfluorescein (Pac) as a quantitative index according to the method of Araie. Paired rabbit corneas were isolated and mounted in a chamber. To serve as a control, one eye of each pair was perfused with a glucose-glutathione-bicarbon...

Journal: :journal of agricultural science and technology 2014
c. chavez c. fuentes f. brambila a. castañeda

subsurface drainage systems are used to control the depth of the water table and to reduce or prevent soil salinity. water flow in these systems is described by the boussinesq equation, and the advection-dispersion equation coupled with the boussinesq equation is used to study the solute transport. the objective of this study was to propose a finite difference solution of the advection-dispersi...

Ahmad Reza Yari, Gharib Majidi, Manochehr Emamian, Mehdi Tanhaye Reshvanloo, Mohammad Hasan Mahmodian, Shahram Nazari, Soudabeh Alizadeh Matboo,

Background & Aims of the Study: Organic dyes with a complex structure are often toxic, carcinogenic, mutagenic, non-biodegradation and stable in the environment and if released to the environment without treatment can endanger the environment and human health. The aim of this study was to evaluate the performance of H2O2 and H2O2/Fe0 Iron in removal of dye Acid Red 18 from aque...

ژورنال: علوم آب و خاک 2011
زهرا عربی, , محمد ‌اسماعیل اسدی, , مهدی همایی, ,

In this study, the effects of enhancing synthetic chelators (HEDTA, EGTA) and low molecular weight organic acids (LMWOA) such as citric acid were compared on cadmium (Cd) solution in soils that were artificially contaminated. Also Cd phytoextraction capability by radish (Raphanus Sativus L.) was studied. The experiment was laid out in a randomized complete factorial design where each treatment ...

Polyvinylchloride (PVC) based heterogeneous cation exchange membranes were prepared by the solution casting technique. The effect of super activated carbon nanoparticles concentration as filler additive in membrane matrix on ionic transfer behaviors of the membrane was studied. SOM images showed uniform particles distribution and relatively uniform surfaces for the membranes. The membrane water...

Journal: :applied biotechnology reports 0
ali izadi sobhan mosayebi dorcheh hamid rashedi

in this study, the substrate diffusion in an immobilized spherical cell-support aggregate is studied and effects of various parameters are investigated on substrates profile. analyses are performed by using of an analytical solution called the least square method (lsm) and results are compared with numerical solution. the effects of effective diffusion coefficient ( d e ), maximum specific grow...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2012
akbar esmaeili, samira ghasemi fariba zamani

in this research, the batch removal of toxic hexavalent chromium ions from wastewater and aqueous solution using dried (bd) sargassum sp. (brown marine algae) and activated carbon (ac) prepared from it was examined. biomass, ph and the initial concentration of cr(vi), adsorption models and kinetic studies were investigated. the experiment was performed in a batch system and theeffect of solutio...

فرزانه, نسرین, هاشمی مجد, کاظم, گلچین, احمد,

The effects of different levels of nitrogen (100, 200, 300 and 400 mg/L) and potassium (125, 250 and 375 mg/L) on yield and leaf N and K concentrations of tomato were investigated in perlit culture using a factorial randomized design with three replications. The highest fruit yield was obtained with 200 mg/L N. Higher levels of nitrogen decreased tomato yield. With increasing nitrogen concentra...

Mesoporous pellet adsorbent developed from mixing at an appropriate ratio of natural clay, iron oxide, iron powder, and rice bran was used to investigate the optimization process of batch adsorption parameters for treating aqueous solution coexisting with arsenate and arsenite. Central composite design under response surface methodology was applied for optimizing and observing both individual a...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1389

fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...

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