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Assessment of Natural Radioactivity and Radiological Hazards in Building Materials used in the Tiruvannamalai District, Tamilnadu, India, using a Statistical Approach
Publication date: Available online 11 November 2015 Source:Journal of Taibah University for Science Author(s): R. Ravisankar, Y. Raghu, A. Chandrasekararn, P. Vijayagopal, B. Venkatraman One-hundred-fifty-one samples of six types of building materials were collected from different locations of the Tiruvannamalai District, Tamilnadu, and were analysed using a gamma ray spectroscopy system. From the results, the highest values observed in the specific activities of 226Ra, 232Th and 40K were 116.1 (soil) 106.67 (sand) and 527.533 (tiles) in Bq kg−1, while the lowest values observed in the specific activities o...
Source: Journal of Taibah University for Science - November 11, 2015 Category: Science Source Type: research

Zn–Al layered double hydroxides intercalated with carbonate, nitrate, chloride and sulfate ions: Synthesis, characterization and dyes removal properties
Publication date: Available online 11 November 2015 Source:Journal of Taibah University for Science Author(s): Fatima Zahra Mahjoubi, Abderrahim Khalidi, Mohamed Abdennouri, Noureddine Barka In this work, Zn-Al layered double hydroxides intercalated with carbonate, nitrate, chloride and sulfate ions were synthesized by co-precipitation method at constant solution pH. The as-synthesized samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and simultaneous thermogravimetric/differential thermal analysis (TGA-DTA). XRD pattern...
Source: Journal of Taibah University for Science - November 11, 2015 Category: Science Source Type: research

Some results about ideals satisfying the condition Cn
Publication date: Available online 11 November 2015 Source:Journal of Taibah University for Science Author(s): Wahiba Messirdi, Charef Beddani We introduce, in this paper, a condition C n that can be viewed as a generalization of the conditions C 2 investigated recently by the present authors in [1–4]. We use this condition to give some results in the study of linear equivalence of ideal topologies and valuation ideals. Moreover, we present the notion of C n -maximal ideals, and we show that every ideal satisfying the condition C n is contained in a C n -maximal ideal. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - November 11, 2015 Category: Science Source Type: research

Characterization of some families of modular multiplicative divisor graphs
Publication date: Available online 6 November 2015 Source:Journal of Taibah University for Science Author(s): R. Revathi, S. Ganesh Modular multiplicative divisor (MMD) labeling of the graph G with p vertices and q edges is a bijection f from the set of all vertices to the set of positive integers {1,2,…,p} such that sum of all edge labels f*(uv) = f(u)f(v)(modp); uv ∈ E(G) is a multiple of p. In this paper we characterize certain classes of MMD graphs. This result answers the open problem raised by G. Sethuraman in AKCE International Journal of Graphs and Combinatorics, No.1 (2009) 229-236. Also we discuss th...
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

The inhibitory activity of aldose reductase of flavonoids compounds. Combining DFT and QSAR calculations
This study shows that the MLR and MNLR have served to predict activity, but when compared with the results given by the ANN model, we concluded that the predictions achieved by this latter is more effective and much better than other models. The statistical results indicate that the ANN model is statistically significant and shows very good stability towards data variation in the validation method. The contribution of each descriptor to the structure-activity relationship is evaluated (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

Mixed alkali effect in physical and optical properties of xK2O-(25-x) Na2O-12.5MgO-12.5BaO-50B2O3 Glasses
Publication date: Available online 6 November 2015 Source:Journal of Taibah University for Science Author(s): G. Srinivas, B. Ramesh, J. Siva Kumar, Md. Shareefuddin, M.N. Chary, R. Sayanna Borate glasses with the composition xK2O-(25-x) Na2O-12.5MgO-12.5BaO-50B2O3 (x=0, 5, 10, 15, 20 and 25mol %) were prepared by the melt-quenching technique and were characterized by using x-ray diffraction technique at room temperature. From the optical absorption spectra direct forbidden, direct allowed, indirect allowed, indirect forbidden energy gaps, Urbach energy, refractive index (n), dielectric constant (ɛ), refle...
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

Development and validation of stability indicating method for simultaneous estimation of cefixime and dicloxacillin using RP-HPLC method
Publication date: Available online 6 November 2015 Source:Journal of Taibah University for Science Author(s): Somnath D. Bhinge, Sharangouda M. Malipatil A simple, rapid, and robust stability indicating RP-HPLC method has been developed and validated to measure Cefixime and Dicloxacillin at single wavelength (225nm) in order to assess assay. A isocratic elution of samples performed on capcell pak C18 DDS5 column (4.6mm x 250mm particle size 5μm) column with mobile phase consisting 5mM Phosphate Buffer (pH 5.4 adjusted with ortho-phosphoric acid): acetonitrile: methanol (42: 55: 03 v/v/v) delivered at flow rate 1.0...
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

Effects of aspartame on the evaluation of electrophysiological responses in Wistar albino rats
In this study, the folate-deficient animal model was used to mimic human methanol metabolism in rats. After 90 days of aspartame treatment, a significant alteration was observable in the time domain [Mean RR (ms) SDNN (ms) RMSSD (ms) PNN50 (%)] and the frequency domain [LF, HF, and LF/HF ratio] with significantly impaired frequency and amplitude of the fronto-parietal and occipital EEG waves at p ≤ 0.05. The results of this study clearly indicate that the oral consumption of aspartame reduced HRV, with sympathetic dominance and loss of vagal tone, and altered sympathovagal activity along with impairment of learning and m...
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

5-substituted 1H-tetrazoles as effective corrosion inhibitors for mild steel in 1M hydrochloric acid
Publication date: Available online 7 November 2015 Source:Journal of Taibah University for Science Author(s): Chandrabhan Verma, M.A. Quraishi, A. Singh The corrosion inhibition efficiency of (E)-3-Phenyl-2-(1H-tetrazole-5-yl) acrylonitrile (PTA), (E)-3-(4-Nitrophenyl)-2-(1H-tetrazole-5-yl) acrylonitrile (NTA), (E)-3-(4-Hydroxyphenyl)-2-(1H-tetrazole-5-yl) acrylonitrile (HTA), on mild steel in 1M HCl was tested using experimental and theoretical methods. Results showed that the inhibition efficiency increases with increasing concentration and maximum values were obtained at 40 mgL−1 concentration. The inhibitio...
Source: Journal of Taibah University for Science - November 7, 2015 Category: Science Source Type: research

Production of bio-gas from poultry litter mixed with the co-substrate cow dung
Publication date: Available online 6 November 2015 Source:Journal of Taibah University for Science Author(s): Mohammad Roman Miah, Abul Kalam Md. Lutfor Rahman, Muhammad Rajibul Akanda, Abdullah Pulak, Md. Abdur Rouf Poultry litter (a mixture of rice hulls, sawdust and chicken excreta of broilers) mixed with the co-substrate cow dung and poultry droppings was evaluated under anaerobic conditions for the production of biogas (methane). Four laboratory scale reactors, R1, R2, R3 and R4, were set up with different proportions of waste poultry litter, cow dung and poultry droppings and had a 6% total solid concen...
Source: Journal of Taibah University for Science - November 6, 2015 Category: Science Source Type: research

ZnO nanorods: Efficient and reusable catalysts for the synthesis of substituted imidazoles in water
Publication date: October 2015 Source:Journal of Taibah University for Science, Volume 9, Issue 4 Author(s): Kobra Nikoofar, Maryam Haghighi, Maryam Lashanizadegan, Zeinab Ahmadvand A simple procedure has been developed for the synthesis of ZnO nanorods (ZnO NRs). The newly synthesized crystals were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Moreover, the catalytic activity was examined in the one-pot, three-component synthesis of 2,4,5-triaryl-1H-imidazoles in water under reflux conditions. The results confirmed ZnO NRs to b...
Source: Journal of Taibah University for Science - October 5, 2015 Category: Science Source Type: research

Water-mediated oxalic acid catalysed one-pot synthesis of 2-(substituted phenyl) phthalazin-1(2H)-ones
Publication date: October 2015 Source:Journal of Taibah University for Science, Volume 9, Issue 4 Author(s): Jaiprakash N. Sangshetti, Firoz A. Kalam Khan, Rashmi S. Chouthe, Zahid Zaheer, Rana Z. Ahmed A simple one-pot, water-mediated synthetic method for the preparation of 2-(substituted phenyl) phthalazin-1(2H)-ones is described through the reaction of phthalaldehydic acid, substituted phenyl hydrazine and oxalic acid (catalyst). The major advantages of the proposed method are its simplicity, short reaction time, easy work-up, inexpensive catalyst, and good yields. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - October 5, 2015 Category: Science Source Type: research

Tin oxide nanoparticles (SnO2-NPs): An efficient catalyst for the one-pot synthesis of highly substituted imidazole derivatives
Publication date: October 2015 Source:Journal of Taibah University for Science, Volume 9, Issue 4 Author(s): Nasibeh Shahrivar Fallah, Masoud Mokhtary In this work, direct three component condensation of 9,10-phenanthraquinone or acenaphthenequinone with aryl aldehyde and ammonium acetate to generate highly substituted imidazole derivatives was performed over tin oxide nanoparticles. The resulting reactions were conducted at high efficiency in ethanol under reflux conditions. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - October 5, 2015 Category: Science Source Type: research

2,4-Dihydropyrano[2,3-c]pyrazole: Discovery of new lead as through pharmacophore modelling, atom-based 3D-QSAR, virtual screening and docking strategies for improved anti-HIV-1 chemotherapy
Publication date: October 2015 Source:Journal of Taibah University for Science, Volume 9, Issue 4 Author(s): Kamlendra Singh Bhadoriya, Mukesh C. Sharma, Shailesh V. Jain Due to the AIDS crisis, development of new, selective and safe non-nucleoside reverse transcriptase inhibitors (NNRTIs) remains a high priority for medical research. The discovery of potential lead compounds by analogue based design studies was accomplished using 3D-QSAR and pharmacophore modelling of non-nucleoside reverse transcriptase inhibitors. A series of 24 diarylaniline analogues as NNRTIs were used to develop an atom based pharmacophore...
Source: Journal of Taibah University for Science - October 5, 2015 Category: Science Source Type: research

Spectrophotometric determination of bismuth after solid-phase extraction using amberlite XAD-2 resin modified with 5-(2′-bromophenylazo)-6-hydroxy pyrimidine-2,4-dione
Publication date: October 2015 Source:Journal of Taibah University for Science, Volume 9, Issue 4 Author(s): Alaa S. Amin, Ishaq A. Zaafarany A highly selective and sensitive spectrophotometric method has been developed for the determination of trace amounts of bismuth in various samples. The method is based on the adsorption of Bi(III) after complexation with 5-(2′-bromophenylazo)-6-hydroxy pyrimidine-2,4-dione (BPAHPD) in a pH range of 2.0–2.5 on amberlite XAD-2 resin in the presence of emulsifier-OP. The retained analyte on the resin recovered with 5.0mL of 2.0molL−1 hydrochloric acid and bismuth was analy...
Source: Journal of Taibah University for Science - October 5, 2015 Category: Science Source Type: research