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Now showing items 1-20 of 56

2-Aryl-6,8-Dibromo-4-Chloroquinazoline as scaffold for the synthesis of Novel 2,6,8-Triaryl-4-(Phenylethynyl)Quinazolines with potential photophysical properties

Paumo, Hugues Kamdem (2014-06)

The 2-aryl-6,8-dibromoquinazolin-4(3H)-ones were prepared in a single-pot operation by condensing 6,8-dibromoanthranilamide and aryl aldehydes in the presence of molecular iodine in ethanol. Treatment of the 2-aryl-6,8-d ...
2-ARYL-6,8-Dibromoquinolinones as synthons for the synthesis of Polysubstituted 4-ARYL-6-Oxopyrrolo [3,2,1-ij] Quinolines

Oyeyiola, Felix Adetunji (2015-09)

The known 2-aryl-6,8-dibromo-2,3-dihydroquinolin-4(1H)-ones 122 were dehydrogenated using thallium(III) p-tolylsulfonate in dimethoxyethane under reflux to afford the 2-aryl-6,8-dibromoquinolin-4(1H)-ones 136. Palladium-catalyzed ...
Ab initio molecular orbital theoretical studies of the molecular complexes of boron trifluoride and oxygen electron donor ligands

Modau, Eric (2021-10)

The optimized geometrical structures, the interaction energies, the basis set superposition errors (BSSEs) and the infrared spectra of the monomers, homodimers and the molecular complexes formed between BF3 and a number of ...
Absorption spectroscopy and surface enhanced vibrational techniques for monitoring dephosphorylation and phosphorylation reactions in model compounds

Eguzozie, Kennedy Uchenna (2012-06)

Mechanistic aspects of phosphorylation, dephosphorylation, pyrophosphorylation and depyrophosphorylation reactions that mimic phosphorylases, dephosphorylases, pyrophosphorylases and depyrophosphorylases have been studied ...
The application of experimental design to investigate the solvent matrix effects observed during the Determination of Rhodium (Rh) in organic media by Graphite Furnace Atomic Absorption Spectrometry (GFAAS)

Baratta, Antonio (2010-11)

In an industrial application a GFAAS method for monitoring the Rh concentration in process streams is being used. Matrix effects are known to exist with the application of this technique; in fact, it was observed that ...
Aromatic oxazolyl and carboxyl functionalized polymers by atom transfer radical polymerization

Maseko, Rejoice Bethusile (2010-02)

The syntheses of aromatic oxazolyl functionalized chain end polystyrene and poly(methyl methacrylate) using an oxazolyl functionalized initiator in atom transfer radical polymerization were effected by the following ...
Assessment of polycyclic aromatic hydrocarbon (PAHs) and heavy metals in the vicinity of coal power plants in South Africa

Okedeyi, Olumuyiwa Olakunle (2012-11)

The distribution and potential sources of 15 polycyclic aromatic hydrocarbons (PAHs) in soils and Digitaria eriantha in the vicinity of three South African coal-fired power plants, Matla, Lethabo and Rooiwal were determined ...
Biscarbene complexes of Bithiophene

Ramontja, James (2009-08)

Binuclear mixed biscarbene complexes of bithiophene were synthesized via the classical Fischer method of synthesis. The metal carbonyls, Mo(CO)6, Cr(CO)6, W(CO)6 and Mn(MeCp)(CO)3 were reacted with dilithiated bithiophene ...
Carbon nanotube membranes for brackish groundwater desalination and removal of organic micropollutants from water

Gumbi, Nozipho Nonsikelelo (2019-07)

This thesis reports on the synthesis and characterisation of various types of oxidised multiwalled carbon nanotubes (O-MWCNTs) modified polymeric membranes. These OMWCNT modified polymeric membranes were then assessed in ...
Cellulose polymers with β-amino ester pendant group: design, synthesis, molecular docking and application in adsorption of toxic metals from wastewater

Nairat, Noor; Hamed, Othman; Berisha, Avni; Jodeh, Shehdeh; Algarra, Manuel; Azzaoui, Khalil; Dagdag, Omar; Samhan, Subhi (2022-06-10)

Abstract Background Cellulose polymers with multidentate chelating functionalities that have high efficiency for toxic metal ions present in water were designed, synthesized, ...
Characterization of silk proteins from African wild silkworm cocoons and application of fibroin matrices as biomaterials

Mhuka, Vimbai (2014-11)

Challenges in treating injuries, together with an increased need for repair of damaged tissues and organs, have made regenerative medicine a major research area today. Biomaterials such as silk fibroin (SF) have proven to ...
Comparative study for iron mediated hydrolysis of 4-nitrophenyl phosphate in cationic and anionic microemulsion media

Mndubu, Yolisile (2009-08-25)

The study of rapid cleavage of organophosphate esters by metal ions is of great interest as it is the most important reaction in both biological and environmental sciences. A good understanding of organophosphate hydrolysis ...
Comparative study of a vitrinite-rich and an inertinite-rich Witbank coal (South Africa) using pyrolysis-gas chromatography

Moroeng, Ofentse M; Mhuka, Vimbai; Nindi, Mathew M; Roberts, R. J; Wagner, Nicola J (2019-10-15)

Abstract This study aims to compare iso-rank vitrinite-rich and inertinite-rich coal samples to understand the impact of coal-forming processes on pyrolysis chemistry. A medium rank C bituminous coal was ...
Cultural influences on seeking and accessing modern health care in Angola

Nunes, Manuel Licas (2009-08-25)

This study examined Angolan culture as an influence to accessing modern scientific health care with the aim to develop health information brochures to inform the population of the advantages of scientific medicine. The ...
The cytotoxic effect and molecular targets of ezetimibe in A549 lung cancer cells

Munnik, Chamone (2023)

The p53 gene is a well-known tumour suppressor gene, shown to be dysfunctional in more than 50% of human malignancies. The cellular significance of this oncogene is evident in a series of diverse cellular antiproliferation ...
The determination of pharmaceutical and personal care products in water and wastewater by gas chromatography-mass spectrometry

Nety, Sol Sauna (2017-09)

Emerging contaminants (EC) are unregulated substances that have entered the environment for as long as they have been produced through human activities. Within the ECs family, pharmaceuticals and personal-care products ...
Determination of quinolones in bovine kidney using hollow-fiber supported liquid membrane extraction prior to liquid chromatography tandem mass spectrometry

Gaolape, Kefilwe Precious (2017-10)

Focus of this study was on the development of one of the faster, simpler, cost effective and environmentally friendly sample pre-treatment techniques which employs a supported liquid membrane, in this case a Hollow-fiber ...
Development and application of dispersive liquid-liquid microextraction for the determination of tetracyclines in meat by liquid chromatography tandem mass spectrometry

Mookantsa, Sandy Oshi Squizer (2016-02)

An environmentally friendly, rapid and cost effective analytical procedure based on dispersive liquid-liquid microextraction was developed for the determination of six tetracyclines (TCs) in meat destined for human ...
The development of FT-Raman techniques to quantify the hydrolysis of Cobalt (III) nitrophenylphosphate complexes using multivariate data analysis

Tshabalala, Oupa Samuel (2007-03)

The FT-Raman techniques were developed to quantify reactions that follow on mixing aqueous solutions of bis-(1,3-diaminopropane)diaquacobalt( III) ion ([Co(tn)2(0H)(H20)]2+) and p-nitrophenylphosphate (PNPP). For the ...
Dispersive liquid-liquid micro-extraction of Chloramphenicol and its congeners residues in water, meat and milk followed by electron spray ionisation liquid chromaotgraphy tandem mass spectrometry detection

Kemokgatla, Ompelege E. (2017-10)

The use of veterinary drugs continues to be a challenge since some farmers use drugs for medicinal purposes, while others use them as growth promoters without observing the set withdrawal times. In emerging economies, ...

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