Pastic Digital Repository: Recent submissions

  • Effect of Ce Substitution on Structural and Electrical Properties of W-type Strontium Hexaferrite Nanomaterials 
    IMRAN KHAN; MUHAMMAD NAEEM ASHIQ; IMRAN SADIQ; ASHEAQ MAHMOOD QURESHI; MAZHAR URANA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    A series of W-type hexaferrites having composition Sr₃CexFe₁₆xO₂₇(x = 0.00, 0.02, 0.04, 0.06) has been prepared by the chemical co-precipitation method. The effect of cerium substitution at Fe site on the structural and ...
  • Adsorption Kinetics of Protons by α-Aluminium Hydroxide 
    SYED MUSTAFA; MUHAMMAD SAFDAR; MUHAMMAD WASEEM; ABDUL NAEEM; SYED TASLEEM; KHIZAR HUSSAIN SHAH; MOHAMMAD TARIQ JAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    The adsorption desorption rate of H⁺ ions on α-aluminium hydroxide has been investigated as a function of pH and temperature from aqueous electrolyte solution of ZnCl₂. It is observed that the protonation of the α-Al(OH)₃ ...
  • Ultrasonically Assisted Extraction and HPLC Determination of Chondroitin Sulfate from Fish Heads 
    CHUN LIN KE; XIAO XIONG ZENG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    In the present study, we investigated the ultrasonically assisted extraction(UAE) and high-performance liquid chromatography (HPLC) determination of chondroitin sulfate(CS) from fish heads. Firstly, the optimized parameters ...
  • Physico-Mechanical Studies of Natural Rubber/Carbon Black Vulcanizates Containing Reclaim Rubber 
    KHALIL AHMED; NUDRAT ZAHID RAZA; KHAULA SHIRIN; KHALID MAHMOOD (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    Locally available reclaim rubber (RR) was used in this study. It was characterized in terms of its oil soluble parts by acetone extract, rubber identified by pyrolysis and FT-IR, carbon black from TGA and ash content by ...
  • Reduction of Aromatic Nitro Compounds Using Aluminium Scrap 
    M.S. KHAN; ABDUL HANAN; ABDUL MAJEED (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-03)
    Reduction of aromatic nitro compounds with metals and concentrat¬ed acids have most commonly been carried out using iron, tin, zinc and magnesium metals. The acids used are H2SO4' HC1 and acetic acid. Astonishingly enough ...
  • Accumulation of Pesticide Residues by Shrimp, Fish and Brine Shrimp During Pond Culture at Ghorabari (District Thatta) 
    RAZIA SULTANA; WAJEEHA ALI; F. AMEER; ALIA BANO MUNSHI; M. NASIR (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    Residual level of persistent organochlorines (OC) such as ∑HCH (α–HCH, β–HCH, γ– HCH, δ–HCH, ∑DDT (o,p'-DDD, op-DDE, p,p-DDE pp–DDD, pp'-DDT, o,p'-DDT), dieldrin and endrin were measured in a number of water samples from ...
  • Spectrophotometric Determination of Diazepam 
    WASEEM ASGHAR KHAN; NARJIS NAZ; NAVEED ASLAM DOGER; NAEEM ASGHAR KHAN; NADEEM ASGHAR KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    Diazepam reacts with ninhydrin at pH range 12-12.5 to give a violet color having maximum absorbance at 530 nm wavelength. The reaction is specific for diazepam and provides a basis for its spectrophotometric determination. ...
  • Use of Tio2 as Catalyst in Degradation Induced with Gamma Radiation of Methylene Blue 
    GABRIELA G. CANO; ALMA MARTINEZ HERNANDEZ; JAIME JIMENEZ BECERRIL (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    Heterogeneous radiocatalysis is a catalytic process promoted by the direct adsorption of high radiant energy capable of activating a semiconductor such as TiO₂, which generates free radicals very reactive at the surface ...
  • Effect of Heat Treatment on the Structural Characteristics and Dehydroxylation Kinetics of the Tunellite 
    MUGE SARI YILMAZ; SABRIYE PISKIN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
    The effect of heat treatment on the structural properties of the tunellite has been investigated in the present study. The tunellite samples were calcined in a furnace for 5 h at three different temperatures, 400, 710, and ...
  • Quality Evaluation and Safety Assessment of Different Cooking Oils Available in Pakistan 
    TAHIR MEHMOOD; ASIF AHMAD; ANWAAR AHMED; NAUMAN KHALID (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)
  • Electrochemical Reduction of Nitrate: A Review 
    IMAM-UL-HAQUE; MUQADDAS TARIQ (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2010-06-20)
    Nitrates are ubiquitous in water bodies. As contaminants they are considered to be hazardous. Electrochemical techniques have been investigated, appraised and developed for their removal. This review presents proposed ...
  • AN UPDATE OF TERPENOIDS, STEROIDS AND BIODIVERSITY OF SEAWEEDS FROM THE COAST OF PAKISTAN 
    ABDUL MAJEED KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-19)
    This review article presents the comprehensive update of the ecology, biodiversity and importance of seaweeds. In addition, the article also presents the terpenoidal and steroidal compounds isolated from seaweeds of the ...
  • Contamination of Agro-Ecosystem and Human Health Hazards from Wastewater used for Irrigatio 
    MUHAMMAD JAMIL; MUHAMMAD SHARIF ZIA; MUHAMMAD QASIM (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-18)
    The use of untreated/inadequately treated wastewater for irrigation in agriculture has been practiced for many years in arid zones of industrialized as well as developing countries. Farmers mostly use wastewater for growing ...
  • STUDY ON THE INCLUSION COMPLEXES OF FLUMORPH AND DIMETHOMORPH WITH Β-CYCLODEXTRIN TO IMPROVE FUNGICIDE FORMULATION 
    XIAO YU-MEI; WANG JIAN; WANG MING-AN; LIU JI-PING; YUAN HUI-ZHU; QIN ZHAO-HAI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-17)
    The β-Cyclodextrin (β-CD) complexes of Flumorph and Dimethomorph have been investigated quantitatively by UV measurement. The results showed that the 1:1 inclusion complexes were formed and the formation constants reduced ...
  • Comparative Study on the Antioxidant and Antimicrobial Activities of Stem-Bark Extract of Litchi chinensis and its Organic Fractions 
    DURRE SHAHWAR; MUHAMMAD ASAM RAZA; MIRZA ABID SHABBIR MUGHAL; MUHAMMAD ATHAR ABBASI; VIQAR U ODIN AHMAD (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-16)
    Aqueous-methanolic (20:80) extract of stem-bark of Litchi chinensis Sonn. was fractionated with diethyl ether, ethyl acetate and n-butanol using solvent extraction technique, and then total phenols (TP), total flavonoides ...
  • Analysis of Free Oxygen Radicals and Antioxidant Enzyme Activities in Blood and Liver Tissues of Rabbits Operated with Argon Plasma Scalpel 
    MUSTAFA YONTEM; SULEYMAN KALELI; MEHMET AKDOGAN; RAMAZAN KAYAPINAR; FATIH GULTEKIN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-15)
    In surgical operations, many techniques are used and their side effects are investigated. The purpose of this study was to analyze free radicals and antioxidant enzyme activities in blood and liver tissues of rabbits which ...
  • Synthesis and Molecular Structure of Bis(4-methylpiperidino- dithiocarbamato)nickel(II) 
    EZZAT KHAN; AMIN BADSHAH; RHETT KEMPE (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-14)
    Reaction of 4-methylpiperidinodithiocarbamic acid (C₇H₁₂NS₂) and nickel bromide in 2:1 ratio carried out under mild reaction conditions, affords the Ni[ (C₇H₁₂NS₂)₂] complex, 2. The complex was studied in the solution state ...
  • Effects of Dimenhydrinate, Prochlorperazine and Cyclizine on Thyroid Hormones and FSH in Sera of Normal Male Rabbits 
    AHMAD; KHALID HUSSAIN JANBAZ; SAEED AHMAD; GHULAM ABBAS (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2010-06-13)
    The effects of dimenhyrinate, prochlorperazine and cyclizine on the serum thyroid hormones and follicle stimulating hormone levels were studied in normal male rabbits for 14-days. Dimenhyrinate (Group B) and cyclizine ...
  • Synthesis of Carbamate Derivatives of Biological Interest 
    SHAHNAZ PERVEEN; NASREEN FATIMA; KHALID MOHAMMED KHAN; AJMAL KHAN; MUHAMMAD ALI; MUHAMMAD IQBAL CHOUDHARY (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-12)
    A number of carbamates derivatives 1-12 were synthesized and evaluated for their antioxidant, urease inhibition, anticancer, antibacterial and antifungal activities. N-Ethylamine-N¢, N¢-diethyl carbamate (4), showed ...
  • A Study of Cobalt Ions Removal from Aqueous Solutions by Sodium X-Zeolite 
    SHER AKBAR; TAJAMAL HUSSAIN SHAH; MUHAMMAD ANWAR; MUZAFFAR KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-06-11)
    Investigations were made to determine the ion-exchange removal of cobalt ions from aqueous solutions over a pH range of 5.5-7.0 by synthetic zeolite NaX using the batch method with initial cobalt chloride solution concentration ...