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Now showing items 161-180 of 18183

Lightscattering and Viscosities Measurements of Dilute Solutions of Some Schiff Base Polymers

ABDUL HAMID CHANNAR; KHALIDA PARVEEN MAHAR; MUHAMMAD YAR KHUHAWAR; SUBHAN MAJIDANO; MUHAMMAD SALEEM KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-05)

Three Schiff base polymers polymethylene-bis(salicylaldehyde)tetramethylethlene-diimine (PMSATen), polymethylene-bis(salicylaldehyde)meso-stillbenediimine(meso-PMSAS) and poly-methylene-bis(2-hydroxyacetophenone)1,2-prop ...
A Model for Making Field-Based Nitrogen Recommendations For Winter Wheat in Western Oregon

DOST MOHAMMAD BALOCH; MAQSOOD AHMED KHAN; EHSANULLAH KAKAR; MOHAMMAD AYAZ KHAN MALG HANI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-04)

A model based on early spring soil and tissue analysis was developed and evaluated for predicting the need for additional nitrogen (N) fertilizer on winter wheat. To develop the model, On-farm trials were established over ...
Characteristic Study of Assimilable Organic Carbon (AOC) Formation Potential in Drinking Water

JI HOON KIM; YOUNG JU KIM; DAE SUNG LEE; AHIR IMRAN QURESHI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2010-04-03)

Characteristic study of assimilable organic carbon formation potential (AOCFP) at different reaction conditions of ozonation using model raw water containing humic substances and natural source drinking water was conducted. ...
NUTRITIVE VALUE OF SPROUTED BARLEY

MUHAMMAD RAUF KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 1999-12-04)

Controlled germination was adopted to asses the nutritional value of germinated barley (malt). Barley was soaked for 10 hours in 3 volume of water. The seeds were sprouted at 20-24°C in the light and dark to give maximum ...
Phosphorus Adsorption Parameters in Relation to Soil Characteristics

AYAZ MEHMOOD; MOHAMMAD SALEEM AKHTAR; RIFAT HAYAT; MEHRUINSA MEMON (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2010-04-02)

Understanding of soil phosphorus (P) adsorption chemistry is essential for evolving best fertilizer management practices aimed at enhancing fertilizer P use efficiency and environment quality. Soil chemical parameters which ...
Isomerization of 3,4-Dichloro-1-butene into 1,4-Dichloro-2-butene by Heterogeneous Catalysis

NARGES SAMADANI LANGEROODI (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2010-04-01)

The isomerization of 3,4-dichloro-1-butene into 1,4-dichloro-2-butene was investigated by gas-liquid chromatography in the temperature range of 60-90 ºC. Fe2₂O₃/TiO₂ was used as a catalyst. Fe₂O₃/TiO₂ solid acid catalyst ...
Synthesis, Characterization and Antimicrobial Activity of Potential Bioactive Organotin(IV) Dithiocarboxylates

Syed Mustansar Abbas; Muhammad Sirajuddin; Farooq Ali Shah; Saqib Ali; Sajjad Ahmad (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A series of newly synthesized organotin(IV) compounds; Me₂SnClL (1) Bu₂SnClL (2), Ph₂SnClL (3), Me₃SnL (4), Ph₃SnL (5) have been derived from the reaction of organotin(IV) chlorides with 4-formylpiperazinium 4-formylpipe ...
Rivina humilis L: A Potential Antimicrobial and Antioxidant Source

Muhammad Ajaib; Annam Zikrea; Khalid Mohammed Khan; Shahnaz Perveen; Shazia Shah; Aneela Karim (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

he antimicrobial and antioxidant activities were carried out on different parts including root, stem, leaf, inflorescence and fruit of plant of Rivina humilis L. It was revealed from the results that the plant extracts ...
Electrochemical Analysis of Phenols through Charging of Phenol Solutions: A New Approach to Electrochemical Analysis of Phenols

Zahid Hussain; Nadia Bashir; Nisar Ahmad; Shahnaz Perveen (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Five different phenols including catechol, hydroquinone, phenol, phloroglucinol and resorcinol were analyzed using a novel electrochemical method of analysis. This method exploits the properties of the phenols to store ...
Investigation of a New Spectrophotometric Method for the Analysis of Carbohydrates using glucose as model

Zahid Hussain; Khalid Mohammed Khan; Asif Ali; Nasr ullah Shah; Shahnaz Perveen (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Carbohydrates are biomolecule of significant importance. Its analysis is of prime importance in the clinical investigations, delivery of medicines and quality control operations of food and fuel products. Based on its ...
Preparation of Bioorganic Rechargeable Battery Using Urea and Chickpea Protein for the Storage and Generation of Electrical Power

Zahid Hussain; Khalid Mohammed Khan; Aman Ullah; Akram Shah; Faiq Saeed; Shahnaz Perveen (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

The concept of the organic rechargeable battery is introduced. This battery is using urea as oxidation half and the aqueous extract of chickpea as reduction half due to the reversible electrochemical oxidation and reductions ...
Synthesis and Crystal Structure of Novel Ethyl 2-chloro-2-(4-(p-tolyl)-1,2,3-thiadiazol-5-yl)acetate

Jian-Chang Jin; Zhao-Hui Sun; Ming-Yan Yang; Na-Bo Sun; Jian-Zhong Jin; Hong-Ke Wu (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A new 1,2,3-thiadiazole compound was synthesized. The crystal structure of the title compound (C₁₃H₁₃ClN₂O₂S, Mr = 296.76) has been determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group ...
Towards the Synthesis of Batrachotoxin-Formation of Alkynyl Stannanes

Aeysha Sultan; Abdul Rauf Raza; Khalid Mohammed Khan (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Batrachotoxin, isolated from frogs belonging to the genus Phyllobates, is a very potent neurotoxin and a steroidal alkaloid that has been found to block the Na+ channels in nerves and muscles resulting in arrhythmias or ...
Synthesis and Biological Activities of 3-1-(3-(2-Chloro-3,3,3-trifluoro- prop-1-enyl)-2,2dimethylcyclopropanecarbonyl)-3-Substituted Phenyl thiourea

Na-Bo Sun; Chao Lei; Jian-Zhong Jin; Jian-Fen Zhang (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Some thiourea compounds containing pyrethroids are synthesized. Their structures were confirmed by ¹H-NMR, MS and elemental analysis. The bioassay results indicated that they showed moderate insecticidal and fungicidal activity.
Asymmetric Epoxidation of Chalcones Promoted by Chiral Schiff Bases and Amino Alcohols

Tianhua Shen; Junqi Li; Funa Cui; Xiaocong Zhou; Xiaoli Chen; Qingbao Song (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A series of chiral ligands were conveniently prepared from L-phenylalanine and characterized. Their application to the asymmetric epoxidation of chalcone was studied. The results demonstrated that 3a were efficient catalysts ...
Synthesis, Crystal Structure and Biological activity of N-(5-(o-tolyl)-1, 3, 4-thiadiazol-2-yl)cyclopropanecarboxamide

Jian-Ying; Na-Bo Sun; Hong-Ke Wu; Xing-Hai Liu (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A new 1, 3, 4-thiadiazole compound, N-(5-(o-tolyl)-1,3,4-thiadiazol-2-yl) cyclopropanecarboxamide, was synthesized and its structure was confirmed by 1H NMR, MS and HRMS. The single crystal structure of the title compound ...
New Antibacterial Diazotized Derivatives of 5-Amino Azaheterocycles

Humaira Yasmeen Gondal; Muhammad Ali (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Six new diazotized derivatives of pharmacologically important azaheterocycles (2a-d, 4a-b) were prepared from their corresponding 5-amino benzimidazoles (1a-d) and benzimidazolones (3a-b). All new compounds have been ...
Synthesis of Antibacterial and Antifungal Activity of Metal (II) Complexes with Schiff Base Derived from 3-Methoxy-5-Bromosalicylaldehyde

Emine Gulhan Bakirdere; Erdal Canpolat; Mehmet Kaya (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

In this study, the complexes of Co (II), Ni (II), Cu (II) and Zn (II) with 2-{(E)-[(4-aminophenyl)imino]methyl}-4-bromo-6-methoxyphenol were prepared and characterized by physical, spectral and analytical data. The metal: ...
Antioxidant Activity of the Various Extracts of Cyclamen graecum Link Tubers and Leaves from Turkey

Hulya Metın; Cıgdem Aydın; Cennet Ozay; Ramazan Mammadov (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

IIn this study, antioxidant activities of various solvent extracts (methanol, ethanol, acetone and petroleum benzine) obtained from tubers and leaves of Cyclamen graecum Link (Primulaceae) were determined. Antioxidant ...
Optimization of Formulation of CMC-Na, Xanthan Gum and Carrageenan Affecting the Physicochemical Properties of Papaya-Wolfberry Beverage using Response Surface Methodology

Jie Zeng; Haiyan Gao; Guanglei Li; Panpan Zhong (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

CMC-Na, xanthan gum and carrageenan are widely employed in food industry. They were used for its thickening properties of aqueous solutions or emulsifying abilities. The present work aims to optimize the formula of the ...

Now showing items 161-180 of 18183

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