Browsing Faculty of Science by Title
Now showing items 2476-2495 of 2496
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Wandering albatross, Diomedea exulans, and the flightless moth, Pringleophaga marioni, on sub-Antarctic Marion Island : a case of thermal ecosystem engineering
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: Recent work has shown that on sub-Antarctic Marion Island, caterpillars of the flightless tineid moth, Pringleophaga marioni, have much higher and considerably less variable populations in recently ... -
Was the evolutionary road towards adaptive immunity paved with endothelium?
(BioMed Central, 2015)Background: The characterization of a completely novel adaptive immune system (AIS) in jawless vertebrates (hagfish and lampreys) presents an excellent opportunity for exploring similarities and differences in design principles. ... -
Wax characterisation by instrumental analysis
(Stellenbosch : Stellenbosch University, 2000-12)ENGLISH ABSTRACT: Various companies produce waxes, which are used extensively in various applications, either as produced or as chemically or physically modified value-added products. They are used in the traditional ... -
Weakening density dependence from climate change and agricultural intensification triggers pest outbreaks : a 37-year observation of cotton bollworms
(John Wiley & Sons Ltd., 2014-08-12)Understanding drivers of population fluctuation, especially for agricultural pests, is central to the provision of agro-ecosystem services. Here, we examine the role of endogenous density dependence and exogenous factors ... -
Well-positioned nucleosomes punctuate polycistronic pol II transcription units and flank silent VSG gene arrays in Trypanosoma brucei
(BioMed Central, 2017)Background The compaction of DNA in chromatin in eukaryotes allowed the expansion of genome size and coincided with significant evolutionary diversification. However, chromatin generally represses DNA function, and ... -
Western Zambian sable : are they a geographic extension of the giant sable antelope
(South African Wildlife Management Association, 2010-04)The giant sable (Hippotragus niger variani) is one of Africa's most spectacular large antelope. Years of civil unrest in Angola, a highly localized distribution and Interbreeding with its congener the roan antelope (H. ... -
What goes around comes around-a comparative study of the influence of chemical modifications on the antimicrobial properties of small cyclic peptides
(MDPI, 2013)Tryptophan and arginine-rich cyclic hexapeptides of the type cyclo-RRRWFW combine high antibacterial activity with rapid cell killing kinetics, but show low toxicity in human cell lines. The peptides fulfil the structural ... -
What is the possible origin of the 195Pt NMR shielding in the solid state? X-ray diffraction, solid-state NMR studies of deceptively simple C2[PtX6] salts (C = various cations, X = Cl- and Br-)
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: The primary objective of the work presented in this thesis is to investigate the sensitivity and nature of the 195Pt chemical shift in the solid-state, as a function of temperature. We have carried out ... -
When homoplasy mimics hybridization : a case study of Cape hakes (Merluccius capensis and M. paradoxus)
(PeerJ, 2016)In the marine environment, an increasing number of studies have documented introgression and hybridization using genetic markers. Hybridization appears to occur preferentially between sister-species, with the probability ... -
White light wavefront control with a spatial light modulator
(Optical Society of America, 2014-05)Spatial light modulators are ubiquitous tools for wavefront control and laser beam shaping but have traditionally been used with monochromatic sources due to the inherent wavelength dependence of the calibration process ... -
Whole body modelling of glucose metabolism in malaria patients
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : Diagnosing a patient with a disease is typically done by considering a list of clinical symptoms. For severe malaria two of the key pathophysiological indicators for poor chances of survival are ... -
Wiskunde van binne en van buite
(Stellenbosch : Stellenbosch University, 2001)Inaugural address delivered by Dirk Laurie during 2001. -
The world without birds : an experimental test of the ecological significance of pollinating birds for plant communities
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Since pollinators are declining in many parts of the world, it is vital to understand the consequences of pollinator loss. How will plant communities be affected? If pollinators are keystone mutualists, ... -
Writer-independent handwritten signature verification
(Stellenbosch : Stellenbosch University, 2015-12)AFRIKAANSE OPSOMMING : In hierdie verhandeling stel ons 'n nuwe strategie vir outomatiese handtekening-verifikasie voor. Die voorgestelde raamwerk gebruik 'n skrywer-onafhanklike benadering tot handtekening- modellering ... -
Y-Chromosome Variation in Hominids: Intraspecific Variation Is Limited to the Polygamous Chimpanzee
(PLoSONE, 2011-12-27)Background: We have previously demonstrated that the Y-specific ampliconic fertility genes DAZ (deleted in azoospermia) and CDY (chromodomain protein Y) varied with respect to copy number and position among chimpanzees ... -
Yeast infection in a beached southern right whale (Eubalaena australis) neonate
(Wildlife Disease Association, 2009)A female southern right whale (Eubalaena australis) neonate was found stranded on the Western Cape coast of southern Africa. Skin samples were taken the same day from three different locations on the animal’s body and ... -
Yeasts and other culturable microorganisms associated with the nickel hyperaccumulator Berkheya coddii and its insect herbivore, Chrysolina clathrata
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: The heterogeneity and distribution of elements on earth is one of the key drivers that shape the biotic processes in any given environment. What we may consider as anomalies in an environment’s element ... -
Young grapevine response and root colonisation following inoculation with arbuscular mycorrhizal fungi
(South African Society for Enology and Viticulture, 2004)The host plant response following inoculation with commercially available arbuscular mycorrhizal (AM) fungi was determined in young grapevines under field conditions which would prevail on a typical farm. Measurements ... -
Zeta diversity as a concept and metric that unifies incidence-based biodiversity patterns
(The University of Chicago Press, 2014-11)Patterns in species incidence and compositional turnover are central to understanding what drives biodiversity. Here we propose zeta (ζ) diversity, the number of species shared by multiple assemblages, as a concept and ... -
α-Diimine complexes of transition metals for the polymerisation of lower α-olefins
(Stellenbosch : University of Stellenbosch, 2005-12)In this study several potential polymerisation catalysts were synthesised. This was accomplished by coordinating α-diimine ligands such as N,N'-diferrocenyldiazabutadiene (DFDAB), N,N'-dimesityldiazabutadiene (DMDAB) as ...
