Azarbaijan Shahid Madani University

About: Azarbaijan Shahid Madani University is a education organization based out in Tabriz, Iran. It is known for research contribution in the topics: Graphene & Nanocomposite. The organization has 1477 authors who have published 3186 publications receiving 30278 citations. The organization is also known as: Azarbaijan University.

Magnetite-doped eggshell membrane as a magnetic sorbent for extraction of aluminum(III) ions prior to their fluorometric determination

Abstract: We have explored the feasibility of using a magnetite-doped eggshell membrane as a magnetic solid phase extraction sorbent for the separation of aluminum ion from aqueous solutions. The sorbent was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. A fast, simple and non-expensive method was then developed for the determination of trace quantities of Al(III) in water and food samples by combining magnetic solid phase extraction with fluorometric quantitation via its highly fluorescent complex with 8-hydroxyquinoline. The effects of pH value, amount of sorbent, sample volume, elution conditions and interfering ions on extraction were optimized. Under optimum conditions, the calibration graph extends from 0.5 to 65.0 μg L−1, the limit of detection is 0.2 μg L−1, and the enrichment factor is 84. The method was validated by the successful analysis of a standard reference material (NIST SRM 1549; nonfat milk powder) and applied to the determination of Al(III) in several waters, black tea, tomato paste and cocoa powder samples.

Evidence for Enhancement of Salinity Induced Oxidative Damages by Salicylic Acid in Radish (Raphanus sativus L.)

Abstract: In recent years some research results have appeared that exogenous salicylic acid provided significant mitigation effect against salinity induced injuries in plants. An experiment was conducted to investigate the effects of salt stress and salicylic acid on radish (Raphanus sativus L.) plants. After appearing first leaves, plants were treated by salicylic acid (0.2 mM) for 3 days and NaCl (180 mM) applied 48 hours after first treatment of salicylic acid. Results showed that salt stress decreased fresh weight of shoots and roots, chlorophyll a, chlorophyll b, anthocyanins and flavonoids contents of leaves. In opposite, this stress increased amount of leaves carotenoids, and both leaves and roots phenolic compounds, hydrogen peroxide, proline and lipid peroxidation content. Salicylic acid had similar effects on these factors. Applying salicylic acid in the saline condition decreased fresh weight of shoot and root, chlorophyll a, chlorophyll b, flavonoids, membrane stability index and increased amount of anthocyanins, carotenoids of leaves, phenolic compounds, proline, hydrogen peroxide, lipid peroxidation of leaves and root. We concluded that benefit of exogenous salicylic acid can be dose dependent and salinity plus salicylic acid, at concentrations applied in this study, were established potent secondary oxidative stress in plants.

On the existence of solutions for a fractional finite difference inclusion via three points boundary conditions

Abstract: In this paper, we discussed the existence of solutions for the fractional finite difference inclusion $\Delta^{ u}x(t)\in F(t,x(t),\Delta x(t),\Delta^{2} x(t))$ via the boundary value conditions $\xi x( u-3)+\beta\Delta x( u -3)=0$ , $x(\eta)=0$ , and $\gamma x(b+ u)+\delta\Delta x(b+ u)=0$ , where $\eta\in\mathbb{N}_{ u-2}^{b+ u-1}$ , $2< u<3$ , and $F:\mathbb {N}_{ u-3}^{b+ u+1}\times\mathbb{R}\times\mathbb{R}\times\mathbb {R}\to2^{\mathbb{R}} $ is a compact valued multifunction.

Synthesis, identification and in vitro drug release of layered zinc hydroxide-gemifloxacin nanohybrids

Abstract: The intercalation of fluoroquinolone antibiotic, Gemifloxacin (GEM) anions, into layered zinc hydroxide (LZH) has been achieved by using ion-exchange method. The GEM-LZH/Chitosan nanocomposite coating Chitosan nanocomposite was prepared in alkaline aqueous solution. Powder X-ray diffraction studies confirmed a basal spacing of 25.54 A, showing that the GEM was successfully intercalated into the LZH interlayer. The arrangement of GEM anions was in a monolayer form between the LZH interlayers. Fourier transform infrared spectroscopy results exhibited the formation of the host–guest nanohybrid without any change in the structure of the GEM. The increased thermal stability of nanohybrid was confirmed by thermal analyses. The in vitro release study of GEM from nanohybrid and nanocomposite was investigated in phosphate buffer saline solution of pH 4.8 and 7.4 using ultraviolet–Visible spectroscopy.