Browsing Faculty of Applied Sciences by Title
Now showing items 32-51 of 158
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Chemoprotective action of natural products on cultured human epithelial cells exposed to aflatoxin B1
(2005)Previous studies indicate that a mutation in the non-oncogenic p53 gene is epidemiologically linked to human HCC (Ozturk, 1991; Chan et al., 2003). Hsu et al. (1991) found this link in Chinese, South African and Asian ... -
Cibulka correlation for ternary excess molar volumes for [MOA]⁺[Tf₂N]⁻ at different temperatures
(2012-08-20)In this work, the binary and ternary excess molar volumes have been calculated from the density, ρ, measurements using an Anton Paar (DMA 38) vibrating tube digital densimeter. One component of the ternary systems studied ... -
Comment on invalid JWKB unstable solutions of combined inertial-Rossby waves
(Annales Geophysicaewww.ann-geophys.net/30/571/2012/, 2012) -
Comparative analysis of genetically modified maize by implementation of a half-seed extraction technique
(2007)The development of transgenic plants resulted in the need to utilize the various molecular methods (e.g., ELISA, real - time PCR etc.) for the detection or analysis of the presence or absence of a specific trait in a ... -
A comparative analysis of stability and structure-functional relationships of different xylanases
(2013-07-30)A comparative thermostability analysis of different partially purified xylanases from Rhodothermus marinus, Bacillus halodurans, Thermomyces lanuginosus and Pulpzyme HC was studied using differential scanning fluorometry ... -
Complete group classification of systems of two linear second-order ordinary differential equations
(Elsevierhttp://dx.doi.org/10.1016/j.cnsns.2013.04.012, 2013-11)We give a complete group classification of the general case of linear systems of two second-order ordinary differential equations excluding the case of systems which are studied in the literature. This paper gives the ... -
Computational studies of anti-cancer Aurein peptides
(2015-01-14)Peptide folding is a very complicated and dynamic process taking place in all living systems. The understanding of a bioactive conformation of the peptides is very important to understand their biological functions and ... -
Computational studies of the folding patterns of small and medium-size polypeptides
(2010)This study involved a series of molecular dynamics (MD) simulations applied to case studies of small and medium-size polypeptides to assess the thermodynamics of their folding characteristics. Peptide folding is a complex ... -
Correlation and prediction of the physical and excess properties of the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate with several alcohols at T= (298.15 to 313.15) K
(2013-07-30)The thermodynamic properties of binary liquid mixtures using an ionic liquid (IL) with alcohols were determined at different temperatures. The ionic liquid used was 1-butyl-3- methylimidazolium methylsulphate [BMIM]+[MeSO4]-. ... -
Cycloaddition reactions of Azatrienes with Sulfene
(Scientific Researchhttp://dx.doi.org/10.4236/ijoc.2012.22019, 2012-04-23)Unprecedented cycloaddition reactions of azatrienes (1) with sulfene leading to the synthesis of functionalized thiazine-dioxide derivatives (5) are described. The reactions were found be highly regioselective resulting ... -
Cytotoxicity and gene expression of selected apoptotic markers in the human laryngeal carcinoma cell line (HEp-2) by Bulbine spp. fractions
(2013-07-30)Apoptosis, or programmed cell death, is a process which is pivotal in eliminating damaged, infected, or unwanted cells from the body. It has been studied in numerous types of cell lines ranging from normal to infected ... -
Densities and excess molar volume for the ternary systems (1-Butyl-3-methylimidazolium methyl sulphate + Nitromethane + Methanol or Ethanol or 1-Propanol) at T = (303.15 and 313.15) K
(SA Epublicationshttp://www.journals.co.za/WebZ/FETCH?sessionid=01-48159-474903037&recno=2&resultset=1&format=F&next=images/ejour/chem/chem_v66_a31.pdf&bad=ej/ej_badfetch.html&, 2013)The densities of the ternary systems containing the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate ([BMIM]+[MeSO4]–) were determined. The ternary systems studied were ([BMIM]+[MeSO4]– + nitromethane + methanol ... -
Densities, speeds of sound, and refractive indices for binary mixtures of 1-butyl-3-methylimidazolium methyl sulphate ionic liquid with alcohols at T = (298.15, 303.15, 308.15, and 313.15) K
(Elsevierhttp://dx.doi.org/10.1016/j.jct.2012.08.030, 2012-09-24)Experimental densities, speeds of sound, and refractive indices of the binary mixtures {1-butyl-3-methylimidazolium methylsulphate ([BMIM]+[MeSO4]−) + methanol, or 1-propanol, or 2-propanol, or 1-butanol} were measured ... -
Density, speed of sound, and refractive index measurements for the binary systems (butanoic acid + propanoic acid, or 2-methyl-propanoic acid) at T = (293.15 to 313.15) K
(Elsevierhttp://www.sciencedirect.com/science/article/pii/S0021961412002972/pdfft?md5=a197b9c7a43c294a3c9c9d5380142c17&pid=1-s2.0-S0021961412002972-main.pdf, 2012-09-17)Density, speed of sound, and refractive index for the binary systems (butanoic acid + propanoic acid, or 2-methyl-propanoic acid) were measured over the whole composition range and at T = (293.15, 298.15, 303.15, 308.15, ... -
Derivatives of coumarins, cinnamic acid and tyramine from leaves of Limonia crenulata
(Pharmascopehttp://pharmascope.org/ijrpp/jdownloads/Volume%203/Issue%201/03-9-12.pdf, 2013)The present research was designed to isolate the Coumarins, Cinnamic acid and Tyramine from Leaves of Limonia crenulata . N - benzoyl tyramine and 2,4 - dihydroxy - 3 - methoxy cinnamic acid were isolated for ... -
Design and operation of a laboratory scale photobioreactor for the cultivation of microalgae
(2011)Due to greenhouse gas emissions from fossil fuel usage, the impending threat of global climate change has increased. The need for an alternative energy feedstock that is not in direct competition to food production has ... -
Detection and quantification of nitrifying bacteria from South African biological nutrient removal plants
(2013-07-30)Nitrification is a crucial step in biological nutrient removal (BNR) processes, mostly carried out by a group of nitrifying bacteria which includes ammonia-oxidising bacteria (AOB) and nitrite-oxidising bacteria (NOB). ... -
Detection methods of organic acid in steam/water circuits and optimisation using HPLC-UV
(2009)This study was mainly a response to a challenge faced by ESKOM in its coal-fired power stations. In spite of using high purity water to drive the turbines, the latter were damaged by ‘pitting’, possibly related to acids ... -
Determination of the heterotrophic and autotrophic active biomass during activated sludge respirometric batch assays using molecular techniques
(2008)Activated sludge models now in use worldwide for the design and operation of treatment systems use hypothetical concentrations of active organisms. In order to validate and calibrate model outputs, concentrations and ... -
Determination of Triclosan and Ketoprofen in river water and wastewater by solid phase extraction and high performance liquid chromatography
(SACIhttp://reference.sabinet.co.za/webx/access/electronic_journals/chem/chem_v67_a25.pdf, 2014-09-17)This paper describes a simple, sensitive and rapid method for the determination of triclosan and ketoprofen in wastewater influent, effluent and river water. The method involves solid phase extraction (SPE) of target ...