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Browsing Volume 31 by Title

Browsing Volume 31 by Title

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  • Kinetics of DeSOx Reaction on Copper and Cerium-based Sorbent-Catalysts 
    HUI WANG; LIU, GUO JIE; YAO WANG; WEI QING Ll; Ll ZHOU; SEN SHI; JIAN SUN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    Kinetics of So2 removal using a copper-based sorbent CuO/γ-Al2O3 and a cerium modified copper sorbent CuO-CeO2/γ-Al2O3 were measured on a TGA and their kinetics behaviors were simulated with a proposed empirical rate model ...
  • Low Frequency Vapour Phase Infrared Spectra of Metal Carbonyls. Derivatives of the type (where X=Br, Cl, H, D, CH3, cm, CF3,) 
    ZAID MAHMOOD (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    Many vibrations which occur in the far-infrared region of spectrum are similar to the types of vibrations found in other regions of the spectrum. They fall in the far-infrared because the atomic masses are large and/or ...
  • Mechanistic Studies on the Reaction of 0-phthalaldehyde (OPTA) with Urea and its N-alkyl/aryl Derivatives 
    BUSHRA MALIHA; ISHTIAQ HUSSAIN; TARIQ, MUHAMMAD ILYAS; SIDDIQUI, HAMID LATIF (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    Urea and its N-alkyl/aryl derivatives react with o-phthalaldehyde (OPTA) to yield blue to purple coloration along-with isoindoline compounds (VII a,b,c) in acidic media. The color is unstable and changes into various shades ...
  • Micellization of Dodecyl Benzenesulfonic Acid and its Interaction with Poly(Ethylene Oxide) Polymer 
    KHAN, MOHAMMAD SALEEM; ZARSHAD ALI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    The interaction between dodecyl benzene sulfonic acid (DBSA) with poly (ethylene oxide) (PEO) has been investigated at 293 K by conductance and surface tension measurements. The effect of concentration on the electrical ...
  • Microencapsulation of Tramadol Hydrochloride and Physicochemical Evaluation of Formulations 
    GHULAM MURTAZA; MAHMOOD AHMAD (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    The present project involves the microencapsulation of tramadol hydrochloride with ethocel using a non-solvent addition coacervation technique. The concentration of ethocel was varied to get a prolonged release profile. ...
  • Microwave-assisted Synthesis of Chiral Bibenzimidazoles 
    GANG CHEN; YING TANG; MEI MENG; XUE-FAN GU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    Three chiral bibenzimidazoles were synthesized by condensation of o-phenylenediamine with L-(+)-glutamic acid, L-(+)-aspartic acid and L-(+)-tariaric acid under microwave irradiation, promoted by polyphosphoric acid (PPA). ...
  • Mixed Complex Combinations with a New Schiff Base used as Membranes Ion-Selective for Copper and Nickel Ions; Analytical Applications 
    LIVIU MITU; CRISTIAN TIGAE; CEZAR SPINU; MARIA PLENICEANU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    Four electrodes with liquid membrane, Cu2+-selective and Ni2+-selective, not previously described in the literature, were prepared and characterized. Electrodes I and 2 are based on mixed complexes of Cu(ll) and Ni(ll) ...
  • Multiple Signaling Pathways Mediated by Dopamine and Calcium ionophore A23187 in Human Platelets 
    SHEIKH ARSHAD, SAEED; MUHAMMAD ANWAR, WAQAR; JAVERIA QUADRI; ZIA-UR-REHMAN, QURESHI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    This study was undertaken to investigate the mechanism(s) of platelet aggregation induced by the synergistic action of dopamine (DA) and a Ca2+ -ionophore, A23187. DA showed non significant effect on platelet aggregation ...
  • Nutritive Values of Brassica campestris L. Oil as Affected by Growth Regulator Treatments 
    ASGHARI BANO; NADEEM KHAN; FAIZANULLAH (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    The effects of plant growth regulators, viz. Indole acetic acid (IAA), Gibberellic acid (GA) and Abscisic acid (ABA) were studied on fatty acid compositions, glucosinolate content and protein content of Brassica campestris ...
  • Oxidation of Benzyl Alcohol in Liquid Phase Catalyzed by Oxides of Nickel 
    MOHAMMAD ILYAS; MUHAMMAD SAEED (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    The oxidation of benzyl alcohol in liquid phase catalyzed by nano sized nickel hydroxide and nickel oxide using water and toluene as solvent was studied. Benzaldehyde and benzoic acid were identified as the reaction products ...
  • Oxidation of CO by 02 over ZnO Studied by FTIR Spectroscopy 
    GHULAM HUSSAIN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    The adsorption of CO at room temperature on finely divided ZnO surfaces, studied by FTIR, shows reversible bands (2250-2050 cm-I) and irreversible absorption bands (1800-600 cm-I ). The irreversible absorption bands (1800-600 ...
  • Partially Cd+ Ion-Exchanged Type-A Zeolites and Their Thermal Analysis 
    SHER AKBAR; RUKHSANA SHAHNAZ; TAJAMUL HUSSAIN, SHAH; MUHAMMAD SAMI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    A series of partially exchanged Cd2+ A-zeolites (Cd0.86 A, Cd1.7 A, Cd2.46 A, Cd2.86 A, Cd3.25 A) were prepared by aqueous cation exchange technique from synthetic NaA-zeolite. The percentage of Cd2+ ions exchanged increased ...
  • Partition Studies on Aqueous Two-Phase System using Sodium Dodecyl Sulphate and Ammonium Salts for Extraction of Dyes 
    REHANA KOUSAR; NIAZI, SHAHIDA BEGUM; FARZANA MAHMOOD; FARZANA IRAM (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    An aqueous two-phase system consisting of sodium dodecyl sulphate (SDS), an anionic surfactant, and NH4NO3 / (NH4)2SO4 as salting out agent has been used for the extraction of ionic dyes. Transparent aqueous two-phase ...
  • Phytochemical Studies on Daphne mucronata 
    RASOOL, MUHAMMAD AZAM; IMUHAMMAD IMRAN; HAQ NAWAZ; ABDUL MALIK; KAZMI, SHAHANA UROOJ (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    Eleven compounds have been isolated for the first time from Daphne mucronata namely, cinnamic acid (1), 7,8-dimethoxycoumarin (2), 7,8-dihydroxycoumarin (3), lupeol (4), ßamyrin (5), betulin (6), 5,6,7,8,3',4'-hexamethoxyflavone ...
  • Quantification and Diversity in the Black Seeds (Nigella sativa L.) Gene Stock of Pakistan for their Composition of Mineral Nutrients 
    IQBAL, MUHAMMAD SAJJAD; ABDUL GHAFOOR; QURESHI, AFSARI SHARIF (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-10-20)
    Nigella sativa (L.) a member of family Ranunculaceae is an annual herbaceous plant indigenous to the Mediterranean region contains more than 100 nutrients and had been used for edible and medicinal purposes in major parts ...
  • Reduction of Aflatoxin-B1 and Ochratoxin-A levels in Polished Basmati Rice (Oryza saliva Linn.) by Different Cooking Methods 
    ARSHAD HUSSAIN; GHOSIA LUTTFULLAH (Karachi: The Chemical Society Of Pakistan, 2009-12-11)
    Rice (Oryza saliva Linn.) is one of the basic diets of Pakistan. The aim of present study was to evaluate the effect of different cooking methods on the levels of aflatoxin-B, (AFB,) and ochratoxin-A (OTA). For this purpose ...
  • Removal of Cu (II) Ions from Aqueous Solutions by Turmeric Powder 
    AMTUL-QAYOOM; SYED ARIF KAZMI; NAUSHABA-RAFIQ (Karachi: The Chemical Society Of Pakistan, 2009-12-05)
    Copper is an essential nutrient, but it is toxic at high intake levels. The presence of copper(II) ions causes serious toxicological concerns, it is usually known to deposit in brain, skin, liver, pancreas and myocardium. ...
  • The Role of Fungi as Aeroallergens in Asthma and Allergies 
    MUHAMMAD ANWAR, WAQAR; TASNEEM AKHTER; ASMA WAQAR; SOHAIL SHAUKAT; MUNEEBA KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    Allergies and asthma are worldwide diseases causing various health problems. Their symptoms include episodic wheeziness, breathlessness, dry cough, etc. Sensitivity to a variety of fungi is known to be a major factor in ...
  • Secondary Metabolites from Alhagi maurorum 
    SAEED AHMAD; IRSHAD AHMAD; MUHAMMAD SALEEM; ABDUL JABBAR; NISAR-UR-REHMAN; SYED SAEED-UL-HASSAN; KANWAR SALEEM AKHTAR; MUHAMMAD IQBAL CHOUDHARY (Karachi: The Chemical Society Of Pakistan, 2009-12-19)
    Eight compounds have been isolated for the first time from Alhagi maurorum namely, β- sitosterol, cinnamic acid, p-coumaric acid, 4-hydroxybenzoic acid, 3'-O-methylorobol, Methyl β-D-glucopyranoside, β-sitosterol ...
  • Sewage Water Pollutants Removal Efficiency Correlates to the Concentration Gradient of Amendments 
    Zulfiqar Ahmad, Bhatti; Qaisar Mahmood; Iftikhar Ahmad, Raja (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2009-08-20)
    Three coagulants viz. alum, FeClG₃, and Moringa oleifera seed extract were compared for treating municipal wastewater. The wastewater samples were collected from a drain near the Murree Road in Abbottabad city. The initial ...

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