Browsing Faculty of Science by Title

Wandering albatross, Diomedea exulans, and the flightless moth, Pringleophaga marioni, on sub-Antarctic Marion Island : a case of thermal ecosystem engineering

Haupt, Tanya Magdeleen (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?

Van Niekerk, Gustav; Davis, Tanja; Engelbrecht, Anna-Mart (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. ...

Wavelet signatures of K-splitting of the Isoscalar Giant Quadrupole Resonance in deformed nuclei from high-resolution (p, p ) scattering off ¹⁴⁶,¹⁴⁸,¹⁵⁰Nd

Kureba, C. O.; Buthelezi, Z.; Carter, J.; Cooper, G. R. J.; Fearick, R. W.; Fortsch, S. V.; Jingo, M.; Kleinig, W.; Krugmann, A.; Krumbolz, A. M.; Kvasil, J.; Mabiala, Justin; Mira, J. P.; Nesterenko, V. O.; Von Neumann-Cosel, P.; Neveling, R.; Papka, P.; Reinhard, P. G.; Richter, A.; Sideras-Haddad, E.; Smit, F. D.; Steync, G. F.; Swartz, J. A.; Tamii, A.; Usman, I. T. (Elsevier, 2018)

The phenomenon of fine structure of the Isoscalar Giant Quadrupole Resonance (ISGQR) has been studied with high energy-resolution proton inelastic scattering at iThemba LABS in the chain of stable even-mass Nd isotopes ...

Wax characterisation by instrumental analysis

Webber, Glenda Vanessa (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

Ouyang, Fang; Hui, Cang; Men, Xin-Yuan; Zhao, Zi-Hua; Shi, Pei-Jian; Zhang, Yong-Sheng; Li, Bai-Lian (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 ...

Weighing evidence

Muller, M. A. (Author retain copyright, 2019-12)

Often different pieces of evidence of different degrees of credibility are submitted in legal proceedings. Then a court “weighs” the evidence and arrives at a conclusion. But how should evidence be weighed? The use of ...

Weight and health status of black female students

Steyn, N. P.; Senekal, M.; Brits, S.; Alberts, M.; Mashego, T.; Nel, J. H. (Health & Medical Publishing Group, 2000)

Objective. To examine black female students for the occurrence of risk factors associated with chronic diseases of lifestyle, namely obesity, hypertension, nicotine usage, dyslipidaemia and compromised mental health ...

Weighted centrality, and a further approach to categorical commutativity

Shaumbwa, Vaino Tuhafeni (Stellenbosch : Stellenbosch University, 2019-12)

ENGLISH ABSTRACT: We investigate weighted commutators, that is, weighted subobject commutator and weighted normal commutator, as well as commutators in the sense of Huq, Higgins, Ursini and Smith, which are all special ...

Well-positioned nucleosomes punctuate polycistronic pol II transcription units and flank silent VSG gene arrays in Trypanosoma brucei

Maree, Johannes P.; Povelones, Megan L.; Clark, David J.; Rudenko, Gloria; Patterton, Hugh-George (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

Jansen van Vuuren, Bettine; Robinson, Terence J.; VazPinto, Pedro; Estes, Richard; Matthee, Conrad A. (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

Scheinpflug, Kathi; Nikolenko, Heike; Komarov, Igor V.; Rautenbach, Marina; Dathe, Margitta (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-)

Odendal, James Arthur (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 ...

What's for dinner? Diet and potential trophic impact of an invasive anuran Hoplobatrachus tigerinus on the Andaman archipelago

Mohanty, Nitya Prakash; Measey, John (PeerJ, 2018-10-02)

ENGLISH ABSTRACT: Amphibian invasions have considerable detrimental impacts on recipient ecosystems. However, reliable risk analysis of invasive amphibians still requires research on more non-native amphibian species. An ...