Browsing Faculty of Science by Title
Now showing items 1517-1536 of 2832
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Kinetic modelling of wine fermentations : why does yeast prefer glucose to fructose
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: In the present-day competitive global market, wine industries are constantly aiming to improve the wine-making process,including the role of yeast. The most commonly used wine yeast is Saccharomyces ... -
Kinetic study of copolymerization and terpolymerization of N-Carboxyanhydrides of ornithine, glycine and aspartic acid
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: Kinetic studies on polymerization of N-Carboxyanhydrides (NCAs) of ornithine, glycine and aspartic acid are described in this report. The studies involved the synthesis of protected amino acid derivatives ... -
Knoxdaviesia proteae is not the only Knoxdaviesia-symbiont of Protea repens
(International Mycological Association, 2015-11-10)Two polyphyletic genera of ophiostomatoid fungi are symbionts of Proteaceae in southern Africa. One of these, Knoxdaviesia, includes two closely related species, K. proteae and K. capensis, that have overlapping geographical ... -
Die konsep van biobeskikbaarheid en die neerlê van eenvormige standaarde vir toelaatbare chemiese kontaminante in die grond
(AOSIS OpenJournal, 2006)Soils are very heterogeneous substrates providing an environmental matrix with varying spatial and temporal gradients of pH, organic carbon, particle size distribution, moisture content as well as biological factors ... -
¹³⁷,¹³⁸,¹³⁹La(n,γ) cross sections constrained with statistical decay properties of ¹³⁸,¹³⁹,¹⁴⁰La nuclei
(American Physical Society, 2017)The nuclear level densities and γ-ray strength functions of ¹³⁸,¹³⁹,¹⁴⁰La were measured using the ¹³⁹La(³He,α), ¹³⁹La(³He,'³He), and ¹³⁹La(d,p) reactions. The particle-γ coincidences were recorded with the silicon particle ... -
Laboratory optimization of a protease extraction and purification process from bovine pancreas in preparation for industrial scale up
(Stellenbosch : Stellenbosch University, 2012-12)ENGLISH ABSTRACT: This study describes: a) Characterization of traditional methodologies and testing methods used to purify and quantify trypsin and α-chymotrypsin b) Re-engineering / development of a new method for ... -
Laboratory X-ray micro-computed tomography : a user guideline for biological samples
(Oxford University Press, 2015)Laboratory X-ray micro-computed tomography (micro-CT) is a fast growing method in scientific research applications that allows for non-destructive imaging of morphological structures. This paper provides an easily operated ... -
Lack of co-crystal formation with cyclotriphosphazenes : a cautionary tale
(South African Chemical Institute, 2016)ENGLISH ABSTRACT: The attempted formation of co-crystals with a series of cyclotriphosphazene derivatives has been investigated. Despite numerous attempts, only one co-crystal was obtained. The crystal structure of this ... -
Lactic acid bacteria : taxonomy antimicrobial characteristics and probiotics
(Stellenbosch : Stellenbosch University, 2002)Inaugural address delivered by Prof Leon Milner Theodore Dicks during 2002, Stellenbosch University. -
Lactobacillus equigenerosi strain Le1 invades equine epithelial cells
(American Society for Microbiology, 2012)Lactobacillus equigenerosi strain Le1, a natural inhabitant of the equine gastrointestinal tract, survived pH 3.0 and incubation in the presence of 1.5% (wt/vol) bile salts for at least 2 h. Strain Le1 showed 8% cell surface ... -
Lake Tanganyika - a melting pot of ancient and young cichlid lineages (teleostei: cichlidae)?
(Public Library of Science, 2015)A long history of research focused on the East Africa cichlid radiations (EAR) revealed discrepancies between mtDNA and nuclear phylogenies, suggesting that interspecific hybridisation may have been significant during the ... -
Laminar flow through isotropic granular porous media
(Stellenbosch : University of Stellenbosch, 2006-12)An analytical modelling procedure for predicting the streamwise pressure gradient for steady laminar incompressible flow of a Newtonian fluid through homogeneous isotropic granular porous media is introduced. The modelling ... -
The Landdroskop area in the Hottentots Holland Mountains as a refugium for melanistic lizard species : an analysis for conservation
(Stellenbosch : University of Stellenbosch, 2005-03)The Dwarf Crag Lizard, Pseudocordylus nebulosus, is one of several relict ectotherm species associated with the mistbelt of the Cape folded mountain belt. Prior to this study, it was only known from a single locality in ... -
A Lanosteryl triterpene from Protorhus longifolia augments insulin signaling in type 1 diabetic rats
(BMC (part of Springer Nature), 2018-10-01)Background: A substantial literature supports antidiabetic properties of the lanosteryl triterpene (methyl-3β- hydroxylanosta-9,24-dien-21-oate, RA-3) isolated from Protorhus longifolia stem bark. However, the ... -
The large mammal fauna from Klasies River
(Stellenbosch : Stellenbosch University, 2000-03)ENGLISH ABSTRACT: The large mammal faunal sample, excavated since 1984 from the Late Pleistocene Klasies River main site, was studied. There are 27 species in eight genera represented. The bovids from the LBS member ... -
Laser induced chlorphyll fluorescence of plant material
(Stellenbosch : University of Stellenbosch, 2007-03)Imaging and spectroscopy of laser induced chlorophyll fluorescence (LICF) are emerging as useful tools in plant physiology and agriculture since these methods allow an early detection of plant stress and transformation ... -
Laser spectroscopy of the Fourth Positive System of carbon monoxide isotopomers
(Stellenbosch : University of Stellenbosch, 2006-03)Carbon monoxide (CO) is a diatomic molecule of particular interest in astrophysics, due to its high abundance in interstellar space. The Fourth Positive System A1Π−X1Σ+ of CO is an important feature in the vacuum ultraviolet ... -
Lead optimisation of an indole based HIV-1 non-nucleoside reverse transcriptase inhibitor
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: HIV-1 remains the worst pandemic faced by mankind since its discovery as the causative agent of AIDS in the early 1980s. An enormous amount of research has been done to find a cure, but to date there has ... -
Learning dynamics of linear denoising autoencoders
(PMLR, 2018)Denoising autoencoders (DAEs) have proven useful for unsupervised representation learning, but a thorough theoretical understanding is still lacking of how the input noise influences learning. Here we develop theory ... -
Ledebouria caesiomontana A.J.Hankey & N.Hahn (Hyacinthaceae: Hyacinthoideae) : a new species from the Blouberg centre of endemism, Limpopo, South Africa
(AOSIS Publishing, 2014)Background: Ledebouria Roth (Hyacinthaceae: Hyacinthoideae) is a largely African genus with, more or less, 40 species occurring in South Africa. The species was first collected in December 1990 by R. Archer [Archer, R.H. ...
