Objective(s): MgO nanoparticles (MgO NPs) could be effective on anxiety-related behaviors in animal models but their exact mechanism of action compared to their conventional form (C MgO) is unclear. This study investigated and compared the effect of MgO NPs and its conventional form on anxiety-related behavior in the sleep-deprived rats and biochemical parameters changes in the serum.Methods: Male Wistar rats (180-220g) were divided into groups of control, sleep deprivation induction, and 72 h sleep deprivation+ different doses of MgO NPs or C MgO. Components were injected a day after sleep deprivation induction and 30 min after injection animals passed anxiety test. Multiple platforms method was used for sleep deprivation induction. Serum oxidant/ antioxidant parameters, magnesium, and brain-derived neurotrophic factor were assessed after anxiety test.Results: Sleep deprivation decreased anxiety-related behavior without change in the serum biochemical parameters. The anxiolytic effect of sleep deprivation decreased in the MgO NPs 1 mg/kg group. C MgO showed limited antioxidant activity, while MgO NPs did not change oxidant /antioxidant parameters, just the serum magnesium increased in the MgO NPs 10 mg/kg group. Conclusions: MgO NPs changed anxiety behavior without changing the oxidant/antioxidant factors, while C MgO changed some antioxidant factors but did not affect anxiety behavior. Therefore, the place or extent of action of MgO NPs and C MgO on anxiety-related behaviors is different (central or peripheral), which needs more investigation.

The mixed metal nanocomposite MgO∙Al2O3∙ZnO has been prepared by coprecipitation method. The product was characterized by XRD. The average particle size was found to be 34.89 nm from XRD data. SEM and SEM-EDS were studied for evaluating surface morphology and elemental composition. The FTIR spectrum of prepared mixed metal nanocomposites MgO∙Al2O3∙ZnO and MgO∙2∙ZnO-curcumin were studied. The optical properties of the nanocomposites were studied by PL (Photoluminescence). The quantum efficiency (F) of MgO∙Al2O3∙ZnO and MgO∙Al2O3∙ZnO-curcumin was found to be 0.86 and 0.31, respectively in acetone. The photocatalytic activity of the nano composite, MgO∙Al2O3∙ZnO was investigated over methyl violet 6b (MV) dye under UV-Visible light irradiation. The photocatalytic activity was assessed with various parameters including variation of pH, effect of H2O22 and reusability. The dye degradation efficiency of nanocomposite was observed to be 48.7% and 93.42% for catalyst and catalyst with H2O2 at pH 9. The efficiency was 86.96% for catalyst with H2O2 at pH 7.

In this paper, the chemical interaction between catalyst and support was studied to understand the observed different growth rate of CNTs in our previous paper. Both pure MgO and Mg(NO3 )2 . 6H2 O as sources of the MgO catalyst support and Fe2 (SO4 )3 · xH2 O as the source of the Fe catalyst, were employed. A Fe catalyst supported on MgO was synthesized using the wet impregnation method followed by calcination. To compare the catalyst grain size and its distribution, the sample were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), BET specic surface area (SSA) measurement, and X-ray photoelectron spectroscopy (XPS). XPS technique was utilized complementary to demonstrate the existence of chemical interaction between MgO support and Fe catalyst. Results revealed that the type of precursor used to prepare the support had a signicant inuence on the morphology of the support and the associated distribution of the Fe catalysts. The highest yield of MgFe2 O4 phase was obtained using a pure MgO precursor which after calcination resulted in a homogenous distribution of nano-sized Fe particles over the support surface.

Improved structures of MgO carbon bonded materials due to new binder systems and due to the application of electrical currents during operation have been achieved for advanced applications in the secondary metallurgy and during near net shape metal casting.