Pastic Digital Repository: Recent submissions

  • Impacts of Solid Waste Leachate on Groundwater and Surface Water Quality 
    SIDRA KARIM; MUHAMMAD NAWAZ CHAUDHRY; KHURSHED AHMED; ADlLA BATOOL (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    The present investigation was carried out to assess the impacts of solid waste leachate on groundwater and surface water quality at unlined dumping site. Six leachate samples collected from different locations have average ...
  • Electrochemical Behavior of Vinblastine Sulfate at Platinum in Acetonitrile 
    INAM-UL-HAQUE; HlNA SABA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    Cyclic, normal-pulse, reverse-normal-pulse, differential-pulse and square-wave voltammetry of vinblastine sulfate was investigated in acetonitrile containing 0.2 M sodium perchlorate without and with 21.4 mM pyridine present ...
  • Characterization of Beta Zeolites by X-Ray Diffraction, Scanning Electron Microscope, and Refractive Index Techniques 
    SHER AKBAR (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    Lithium and sodium beta zeolites (Li-BEA, Na-BEA) by aqueous ion exchange at 65 °C and protonic beta zeolite (H-BEA) by deammoniation of NH₄-BEA at 540 °C were prepared. The crystallinity and morphology of all the samples ...
  • Characterization of Essential Oil of Local Varieties of Citrus paradisi Peel 
    MUHAMMAD NAEEM KHAN; SHAHID MAHMUD; IFTlKHAR HUSSAIN BALOCH; SALMA REHMAN; MUNAWAR ALIMUNAWAR (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    The essential oil from Citrus paradisi peel was analyzed for its chemical composition. The GC and GC/MS studies of the essential oil revealed the presence of 23 constituents; out of which 15 constituents were identified ...
  • Evaluation of Selenium Content of Plant Samples Collected from Indigenous Sources for Se-supplementation 
    TARIQ MAHMUD; ARIFA SOSAN; RABIA REHMAN; MUHAMMAD IMRAN; AADIL ABBAS (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    Selenium contents were evaluated in different plant species such as Canola (Brassica napus), Sunflower (Helianthus annus), Turmeric (Curcuma longa), Soyabean Seeds (Glycine max) and Akk (Calotropis procera) in order to ...
  • Effect of Temperature on Sequestration of Cu(ll) from Aqueous Solution onto Turmeric Powder 
    AMTUL QAYOOM; SYED ARIF KAZMI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    In this work effect of temperature on adsorption of Cu(II) onto turmeric powder was investigated in order to understand sequestrating behavior of turmeric powder. Langmuir, Freundlich and D-R equilibrium models were employed ...
  • Catalytic Conversion of Waste Low Density Polyethylene into Valuable Products 
    FAZAL MABOOD; JASMIN SHAH; MOHAMMAD RASUL JAN; ZAHID HUSSAIN; FARAH JABEEN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-10-20)
    Waste low density polyethylene (LDPE) from household and industries are recognized to be a major environmental problem. LDPE represent a source of energy and valuable chemical products. Waste LDPE were pyrolysed catalytically ...
  • Arsenic Contamination in Water and its Removal by using Different Low Cost Adsorbents 
    NASEEM ZAHRA (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2010-04-20)
    Industrial waste constitutes the major source of various kinds of pollution in natural water and toxicity from heavy metals has been reported worldwide. The presence of arsenic in water is major problem these days. High ...
  • Vinblastine: A Review 
    INAM-UL.-HAQUE; HINA SARA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-19)
    Vinblastine sulfate extracted from leaves of Catharanthus roseus is widely used as an anti-cancer drug. Chemically vinblastine is one of the Vinca alkaloids that inhibit the polymerization of tubulin, resulting in the ...
  • Synthesis of Some 1, 2, 4-Triazole Derivatives and Investigation of their Fungicidal Activities 
    IRAM JANAM SINGH; DHARMENDRA KUMAR SINGH (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-18)
    The synthesis of a series of 3-pyridyl-6-aryl-s-triazolo (3, 4-b) (1, 3, 4) – thiadiazoles are described. synthesis of 3-pyridyl-6-aryl-s-triazolo (3, 4-b) (1, 3, 4) – thiadiazoles (3a-m) have been achieved by the ...
  • An Unplanned Synthesis of Symmetrical 1,3-Disubstituted Ureas 
    SHAHNAZ PERVEEN; SANA MUSTAFA; KHALID MOHAMMED KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-17)
    When urea derivatives (N-aryl-N’,N’-dialkyl urea) or (N-aryl-N’-alkyl/aryl urea) 1a-1u react with diethylcarbamyl chloride at 50-60 ºC symmetrical 1,3-disubstituted ureas 2a-2f were formed as major products instead of ...
  • Continuous Bioleaching of Copper from Copper Smelters Dust with a Mixed Culture of Mesophilic Bacteria 
    FERESHTEH BAKHTIARI; MORTAZA ZIVDAR; HOSSEIN ATASHI; SEYEDALI SEYEDBAGHERI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-15)
    Bioleaching of the copper flue dust of the smelting furnaces of Sarcheshmeh Copper Complex has been investigated. At present, the dust is recycled to the smelters, which reduces their efficiencies and increases the required ...
  • Generation of Bioenergy by the Aerobic Fermentation of Domestic Wastewater 
    ABDUL MAJEED KHAN; MUHAMMAD MANSOOR ALI; SHAMSA NAZ; MUHAMMAD SOHAIL (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-14)
    This research article demonstrates the development of microbial fuel cells (MFCs) for the generation of electrical energy by the aerobic fermentation of domestic wastewater (DWW) using the yeast as a culture of microorganisms. ...
  • Substituent Effect on the Asymmetric Induction with (1R,2S,5R)-and (1S,2R,5S)-menthol Auxiliaries 
    MUSTAFA ER; NECDFT COSKUN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-13)
    Substituted benzaldehydes reacts in cis-diastereoselective manner with menthyl haloacetates in the presence of phase transfer catalyst and a base in THF at room temperature to give the corresponding 3-aryloxirane-2-carboxylates ...
  • Sensitivity of Cells Towards Streptolysin S (SLS) 
    BADARUDDIN A. MEMON (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-12)
    Streptolysin S (SLS) produced by group A Streptococcus (GAS) is very potent membrane-damaging agent and lyses a wide variety of living cells and organelles. This study is about the comparison between the relative sensitivity ...
  • Antibacterial Compounds and other Constituents of Evernia divaricata (L.) Ach. 
    CHAO YUAN; XIU JUAN ZIIANG; YUAN DA DU; YU HUA GUO; LI YAN SUN; QIANG REN; AA TIAN ZHAO (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-11)
    An activity-directed fractionation and purification process was used to isolate the antibacterial compounds from Evernia divaricata (L.) Ach. Six lichen substances were obtained from the active petroleum ether and ethyl ...
  • Drug Release Kinetics and Stability Studies of Tablets of Tramadol HCl Microspheres 
    MUHAMMAD NAEEM AAMIR; MAHMOOD AHMAD; NAVEED AKHTAR; GHULAM MURTAZA; MUHAMMAD ASADULLAH (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-10)
    The objectives of study were the development of new formulations of Tramadol HCl (TmH) microspheres and their evaluation primarily for kinetics and stability. Microspheres of different polymer concentration M₁ (1:1), ...
  • HPLC Determination of Putrescine and Cadaverine in Serum of Cancer Patients Using Acetylacetone as Derivatizing Reagent 
    MUHAMMAD YAR KHUHAWAR; ROSHAN ALI GILAL; FAQEER MAHBOOB ALI RIND; ABDUL HAKEEM MEMON; MUHAMMAD USMAN MEMON (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-09)
    Liquid chromatographic procedure has been developed for the determination of putrescine (Put) and cadaverine (Cad) after derivatization with acetylacetone in aqueous-methanolic solution at pH 8.2. The derivatives were ...
  • Effect of Molecular Mass of Polyethylene oxide over its Aggregation Behavior 
    ABDUR RAUF; MUSA KALEEM BALOCH; GULREZ FATIMA DURRANI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-07)
    Samples of polyethylene oxide having different molecular mass (35, 12, 6 Kg/mol) are investigated with reference to characteristic concentration (CC), critical aggregation concentration (CAC) and hydrodynamic radius (RH), ...
  • Acidic Surface Functional Groups and Mineral Elements in Lakra Coal (Sindh, Pakistan) 
    KHALID SATED; MUHAMMAD ISHAQ; IMTIAZ AHMAD; MUHAMMAD SHAKIRULLAH; SAJJAD HAIDER (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-06)
    Surface acidity of virgin coal (Lakra Sindh, Pakistan) and variously extracted/leached coal samples leached with HNO₃, NaOH, and KMnO₄, were investigated by aqueous potentiometric titration employing KOH as a titrant. The ...