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Tribromo melamine-catalyzed one-pot synthesis of a series of 4-aryl-4,5-dihydro-1H-indeno[1,2-b]pyridine derivatives
Publication date: September 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 5 Author(s): Prasanna Nithiya Sudhan, Majid Ghashang, Syed Sheik Mansoor A simple and efficient synthesis of 4-aryl-4,5-dihydro-1H-indeno[1,2-b]pyridine derivatives was achieved in one pot via a four-component cyclocondensation of aromatic aldehydes, 1,3-indanedione, β-ketoesters and ammonium acetate in the presence of tribromomelamine (TBM) as the catalyst under neat conditions. The present approach offers several advantages, such as shorter reaction times, higher yields, low cost, simple work-up and easy purification ...
Source: Journal of Taibah University for Science - August 29, 2016 Category: Science Source Type: research

Water purification using different waste fruit cortexes for the removal of heavy metals
Publication date: September 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 5 Author(s): Khairia M. Al-Qahtani The use of different cortex fruit wastes, including banana, kiwi and tangerine peels, for removing toxic and heavy element Cd+2, Cr+3 and Zn+2 ions from aqueous solutions has been previously investigated. The ground material was powdered in a mortar and passed through a screen to obtain two different particle sizes, 1 and 2mm, for all of the powders. In preliminary experiments using kiwi cortex, material with a 1-mm particle size showed a higher retention capability (up to 10–16% of Cd+...
Source: Journal of Taibah University for Science - August 29, 2016 Category: Science Source Type: research

Novel pyrazinamide condensed azetidinones inhibit the activities of cholinesterase enzymes
Publication date: September 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 5 Author(s): Karthikeyan Elumalai, Mohammed Ashraf Ali, Sekar Munusamy, Manogaran Elumalai, Kalpana Eluri, Sivaneswari Srinivasan A series of novel pyrazinamide condensed azetidinones was prepared with pyrazinamide Schiff's bases and chloroacetylchloride in the presence of catalytic amounts of 1,4-dioxane and triethylamine. The chemical structures of the synthesized compounds (6a–6m) were confirmed by melting point analysis, TLC, IR, 1H NMR, mass spectrometry, and elemental analysis. The synthesized compounds were e...
Source: Journal of Taibah University for Science - August 29, 2016 Category: Science Source Type: research

Effect of non Maxwellian distribution on the dressed electrostatic wave and energy properties
Publication date: Available online 30 July 2016 Source:Journal of Taibah University for Science Author(s): N.F. Abdo The investigation of dressed electrostatic and energy ion acoustic solitary waves in a warm plasma composed fluid of ions, Maxwillian positrons and fast nonthermal electrons are elaborated. The plasma system is reduced to KdV equation that obtained using reductive perturbation method. For enlarged amplitude, the higher order perturbed equation is proposed. The positron parameters and nonthermal electron effects on broadband dressed electric field and energy are discussed. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - July 30, 2016 Category: Science Source Type: research

Travelling wave solutions of the generalized nonlinear fifth-order KdV water wave equations and its stability
Publication date: Available online 22 July 2016 Source:Journal of Taibah University for Science Author(s): Aly R. Seadawy, Dianchen Lu In the present study, by implementing the direct algebraic method, we present the traveling wave solutions for some different kinds of the Korteweg-de Vries (KdV) equations. The exact solutions of the Kawahara, fifth order KdV and generalized fifth order KdV equations are obtained. Solutions for the Kawahara, fifth order KdV and generalized fifth order KdV equations are obtained precisely and efficiency of the method can be demonstrated. The stability of these solutions and the move...
Source: Journal of Taibah University for Science - July 24, 2016 Category: Science Source Type: research

Combining DFT and QSAR studies for predicting psychotomimetic activity of substituted phenethylamines using statistical methods
Publication date: Available online 20 July 2016 Source:Journal of Taibah University for Science Author(s): A. Aouidate, A. Ghaleb, M. Ghamali, S. Chtita, M. Choukrad, A. Sbai, M. Bouachrine, T. Lakhlifi The DFT-B3LYP method, with the base set 6-31G (d) was used to calculate electronic and charge descriptors. The present study was performed using principal component analysis (PCA), multiple linear regression analysis (MLR) and non-linear multiple regression analysis (MNLR) to predict unambiguous QSAR models of 46 substituted phenethylamines toward psychotomimetic activity. Results showed that the MLR and...
Source: Journal of Taibah University for Science - July 21, 2016 Category: Science Source Type: research

Combining DFT and QSAR computation to predict the interaction of flavonoids with the GABA (A) receptor using electronic and topological descriptors
Publication date: Available online 21 July 2016 Source:Journal of Taibah University for Science Author(s): M. Ghamali, S. Chtita, A. Aouidate, A. Ghaleb, M. Bouachrine, T. Lakhlifi To establish a quantitative structure-activity relationship model of the binding affinity constants (-log Ki) of 41 flavonoid derivatives towards the GABA (A) receptor, the DFT-B3LYP method with basis set 6-31G (d) was performed to gain insights into the chemical structure and property information for the studied compounds. The best topological and electronic descriptors were selected. This work was conducted with principal compo...
Source: Journal of Taibah University for Science - July 21, 2016 Category: Science Source Type: research

Optical properties of amorphous Li2O –WO3–B2O3 thin films deposited by electron beam evaporation
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): Avula Edukondalu, Syed Rahman, Shaik Kareem Ahmmad, Ajay Gupta, K. Siva Kumar Thickness dependencies of the optical properties of as-deposited amorphous 30Li2O–10WO3–60B2O3 thin films prepared by electron beam evaporation on glass substrates at a base pressure of 9×10−7 Torr were studied. Glancing angle X-ray diffraction studies were performed to confirm the amorphous nature of the prepared films. The absorption coefficient α (and therefore the extinction coefficient k) was determined from the ref...
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

Complex optical study of V2O5 –P2O5–B2O3–Dy2O3 glass systems
In this study, complex optical parameters such as absorption, extinction coefficient, refractive index, optical conductivity and real and imaginary dielectric constants of V2O5–P2O5–B2O3–Dy2O3 glass systems were studied. The conformation of the glassy phase in a sample was accomplished by X-ray diffraction analysis, and the material's optical parameters were analyzed using ultraviolet–visible spectroscopy. The extinction coefficient and real and imaginary dielectric constants were found to linearly increase above 225nm, and the optical conductivity in V2O5–P2O5–B2O3–Dy2O3 glass systems was found to gradually ...
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

FT-IR and Raman spectroscopic studies of ZnF2 –ZnO–As2O3–TeO2 glasses
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): Shaik Kareem Ahmmad, M.A. Samee, S.M. Taqiullah, Syed Rahman The effect of fluorine substitution on the spectral properties of the xZnF2–(20-x)ZnO–40As2O3–40TeO2 (x =0, 4, 8, 12, 16 and 20mol%) glass system was investigated by FTIR and Raman spectroscopies. The results demonstrate that TeO4 and TeO3 were among the primary structural units in the investigated glasses in addition to As2O3 pyramids and ZnO4 structural units. The addition of fluorine results in the reduction of TeOTe linkage due to a grad...
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

Evidence of intermediate phase in AsxSe100 −x chalcogenide glasses using isoconversional analysis of glass transition
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): Abdalla A. Elabbar The compositional and temperature dependence of the glass transition in As x Se100−x chalcogenide glasses were studied using differential scanning calorimetry (DSC). The temperature dependence of the glass transition activation energy was determined using an isoconversional kinetic analysis. The compositional trend of the activation energy provides evidence of a transition from floppy to rigid network regimes separated by an intermediate phase. The variations of the activation energy with re...
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

Genetic, dietary, and non-dietary risk factors of obesity among preparatory-year female students at Taibah University, Saudi Arabia
In conclusion, a positive correlation between glucose and some biochemical parameters was found in the HGL group; 24.5% of the population had the (A allele) risk factor, and 32% and 98% of the population were homozygous (AA) and heterozygous (AT) for the rs9939609 FTO obesity-risk allele that is responsible for greater energy intake. Future studies are required to study the FTO gene variant and its association with different biochemical parameters, mainly glucose, weight, and BMI, between males and females at different ages and locations in Saudi Arabia. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

Solar light-facilitated oxytetracycline removal from the aqueous phase utilizing a H2O2/ZnWO4/CaO catalytic system
Publication date: Available online 19 July 2016 Source:Journal of Taibah University for Science Author(s): Pankaj Raizada, Pooja Shandilya, Pardeep Singh, Pankaj Thakur A CaO-supported ZnWO4 nanocomposite (ZnWO4/CaO) was successfully synthesised using a novel hydrothermal method and was characterized by scanning electron microscopy (SEM), tunnelling electron microscopy (TEM), X-ray diffraction (XRD), electron diffraction X-ray (EDX), Fourier transform infrared spectroscopy (FTIR) and UV-visible (UV-vis) spectral analysis. The ZnWO4/CaO composites exhibited rod-like morphologies with variable lengths from 45nm t...
Source: Journal of Taibah University for Science - July 20, 2016 Category: Science Source Type: research

The complexity of some families of cycle-related graphs
Publication date: Available online 4 May 2016 Source:Journal of Taibah University for Science Author(s): S.N. Daoud, K. Mohamed In this paper, we derive new formulas for the number of spanning trees of a specific family of graphs – gear graphs, flower graphs, sun graphs and sphere graphs – using techniques from linear algebra, Chebyshev polynomials and matrix theory. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - July 1, 2016 Category: Science Source Type: research

Thermal, structural and spectroscopic properties of Pr3+-doped lead zinc borate glasses modified by alkali metal ions
Publication date: Available online 13 May 2016 Source:Journal of Taibah University for Science Author(s): M.V. Sasi kumar, B. Rajeswara Reddy, S. Babu, A. Balakrishna, Y.C. Ratnakaram This paper offers a study on Pr3+-doped alkali and mixed-alkali borate glasses prepared by the melt quenching technique and characterized by thermal, structural and spectroscopic studies. The amorphous nature of the glassy systems was identified based on X-ray diffraction. The thermal behaviour of glasses was studied using differential thermal analysis (DTA). The functional groups contained in the glasses were identified by Four...
Source: Journal of Taibah University for Science - June 26, 2016 Category: Science Source Type: research