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Now showing items 17 - 32 of 428


    A novel microwave-assisted process is described for the rapid removal of catalytic metal and non-desirable carbon impurities in fullerene, single wall, and multiple wall carbon nanotube preparations. The purification process is carried out at various programmed pressures, power levels and reaction times in a suspension of the nanocarbon moieties in the presence of strong acids (for example, a mixture of sulfuric acid and nitric acid), in weak acids (for example, acetic acid) and in the presence of chelating agents (for example, EDTA - ethylenediaminetetraacetic acid). In one embodiment, high metal removal efficiency of 70 to 90 % is observed.
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  • Chemical composition, phytochemical analysis and antimicrobial activity of Boerhavia procumbens

    Khalil, Abdul Wajid   Iqbal, Zafar   Adhikari, Achyut  

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  • Understanding Consumer Choices and Preferences in Transaction-Based e-Services

    Iqbal, Zafar   Verma, Rohit   Baran, Roger  

    The rapid increase in transaction-based e-services creates a challenge for firms: What combination of features should they offer to satisfy consumers while realistically considering operational and financial constraints? This article explores the above question by highlighting similarities and differences in consumer preferences between different segments for a transaction-based e-service. The study employs a Web-based discrete choice experiment, in which 1,430 consumers are offered e-service options, differing from each other in terms of non-web-based and online-only features, price per transaction, and marketing promotions. The results demonstrate that overall, consumer preferences for features of transaction-based e-services differ between offline and online consumers. Furthermore, with increase in consumer usage frequency, interesting trends regarding the relative importance for features are observed. Similarities also exist in consumer preferences between various usage-frequency-based consumer segments. The authors believe that these results have both managerial and research implications for design and operations strategy formulation for transaction-based e-services.
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  • The Role of Plants in Human Welfare

    Ijaz, Farhana   Iqbal, Zafar   Rahman, Inayat Ur   Ali, Niaz   Qadir, Ghulam   Khan, M Azhar   ud-Din, Aziz   Shah, Abbas H   Ali, Imtiaz   Hussain, Saddam   Khan, Anees   Shah, Muzammil   Sadiq, Wasaf  

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  • Fabrication and comparison of Dye-sensitized solar cells by using TiO2 and ZnO as photo electrode

    Pervez, Aneel   Javed, khalid   Iqbal, Zafar   Shahzad, Monas   Khan, Usman   Latif, Hamid   Abbas Shah, Saqlain   Ahmad, Naeem  

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  • W-25%Re-HfC composite materials for Pin tool material applications: Synthesis and consolidation

    Iqbal, Zafar   Saheb, Nouari   Shuaib, Abdel Rahman  

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  • Performing competitive analysis in QFD studies using state multipole moments and bootstrap sampling

    Iqbal, Zafar   Grigg, Nigel P.   Govindaraju, K.  

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  • Bismuth(III) based Metal Organic Frameworks: Luminescence, Gas Adsorption, and Antibacterial Studies

    Iram, Shamaila   Imran, Muhammad   Kanwal, Farah   Iqbal, Zafar   Deeba, Farah   Iqbal, Qazi Javed  

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  • Clinical effectiveness: the potential for change in maternity care

    Iqbal, Zafar   Clarke, Michael   Taylor, David J.  

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  • Automatic incident detection in smart city using multiple traffic flow parameters via V2X communication

    Iqbal, Zafar   Khan, Majid Iqbal  

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  • Three-Gap Analysis of Structural Adjustment in Pakistan

    Iqbal, Zafar   James, Jeffrey   Pyatt, Graham  

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  • Anthelmintic activity of Artemisia brevifolia in sheep

    Iqbal, Zafar   Lateef, Muhammad   Ashraf, Muhammad   Jabbar, Abdul  

    This paper describes the in vitro and in vivo anthelmintic activity of Artemisia brevifolia in comparison with levamisole. In vitro studies revealed anthelmintic effects of crude aqueous (CAE) and methanol extracts (CME) of Artemisia brevifolia (whole plant) on live Haemonchus contortus as evident from their paralysis and/or mortality at 6h post exposure. For in vivo studies, the whole plant of Artemisia brevifolia was administered as crude powder (CP), CAE and CME at graded doses (1, 2 and 3gkg−1 body weight (b.w.) to sheep naturally infected with mixed species of gastrointestinal nematodes. Maximum reduction (67.2%) in eggs per gram (EPG) of faeces was recorded on day 14 post treatment in sheep treated with Artemisia brevifolia CAE at 3gkg−1 b.w. It was found that, although, Artemisia brevifolia whole plant possesses anthelmintic activity against nematodes, it is not comparable with levamisole (99.2%reduction in EPG) at any of the doses tried in this study. However, increase in EPG reduction was noted with an increase in the dose of Artemisia brevifolia administered as CP, CAE and CME. The graded dose response suggested further studies on a larger number of animals on higher doses than those used in the current study.
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  • Spectral, photophysical and photochemical properties of tetra- and octaglycosylated zinc phthalocyanines

    Iqbal, Zafar   Masilela, Nkosiphile   Nyokong, Tebello   Lyubimtsev, Alexey   Hanack, Michael   Ziegler, Thomas  

    Photophysical and photochemical properties of a series of tetra- and octaglycosylated zinc phthalocyanines (ZnPcs) substituted with glucose and galactose moieties have been reported. Spectral properties of these phthalocyanines are compared in DMSO. Absorption spectra of the non-peripherally tetra- substituted ZnPcs 2 showed a significant red shift in their Q-band maxima as compared to the peripherally substituted analog 1. All the complexes gave high triplet quantum yields ranging from 0.68 to 0.88, whereas triplet lifetimes were in the range of 100-430 mu s in argon-saturated solutions. The octagalactosylated ZnPc 3b showed the highest triplet quantum yield and singlet oxygen quantum yield of 0.88 and 0.69, respectively. The fluorescence quantum yields and lifetimes of all the compounds under investigation were within the range of zinc phthalocyanine complexes.
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  • A distance-based methodology for increased extraction of information from the roof matrices in QFD studies

    Iqbal, Zafar   Grigg, Nigel P.   Govindaraju, K.   Campbell-Allen, Nicola M.  

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  • Synthesis of Octaglycosylated Zinc(II) Phthalocyanines

    Iqbal, Zafar   Lyubimtsev, Alexey   Herrmann, Timo   Hanack, Michael   Ziegler, Thomas  

    For the first time, octaglycosylated zinc(II) phthalocyanines in which the sugar part is protected by acetyl groups and the deprotected zinc(II) phthalocyanines were synthesized and characterized. The sugars glucose, galactose, lactose, cellobiose, and maltose are anomerically attached either via oxygen or sulfur to the phthalocyanine ring. The necessary starting materials for the syntheses of the phthalocyanines, the anomerically 4,5-diglycosylated phthalonitriles, were obtained by reacting the anomerically deprotected sugars containing OH and SH groups with 4,5-difluorophthalonitrile. The acetyl protected octaglycosylated phthalocyanines were obtained in yields between 55 and 78% by heating the anomerically 4,5-diglycosylated phthalonitriles in DMF with hexamethyldisilazane, p-toluenesulfonic acid, and zinc acetate. The acetyl groups in sugar moieties were removed to afford corresponding water-soluble phthalocyanines.
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  • Clinical investigations on gastroprotective effects of ethanolic extract of Phyllanthus emblica Linn fruits

    Iqbal, Zafar   Asif, Muhammad   Aslam, Naveed   Akthar, Naveed   Asmawi, Mohd Zaini   Fei, Yam Mun   Jabeen, Qaiser  

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