Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 470-489 of 4818
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Bone density and asymmetry are not related to DDT in House Sparrows: insights from micro-focus X-ray computed tomography
(Elsevier, 2018)In organisms, DDT (Dichlorodiphenyltrichloroethane) and its metabolites, DDE (Dichlorodiphenyldichloroethylene) and DDD (Dichlorobischlorophenylethane) are endocrine mimics. They can influence bone density and other bone ... -
Bootstrap maximum likelihood for quasi-stationary distributions
(Taylor & Francis, 2018)Quasi-stationary distributions have many applications in diverse research fields. We develop a bootstrap-based maximum likelihood (BML) method to deal with quasi-stationary distributions in statistical inference. To ... -
Bootstrap procedures for online monitoring of changes in autoregressive models
(Taylor & Francis, 2016)We compare the behavior of several bootstrap procedures for monitoring changes in the error distribution of autoregressive time series. The proposed procedures are designed to control the overall significance level and ... -
Bootstrapping an XML Schema of syntactic functions into a skeleton ontology
(North-West University (Vaal Triangle Campus), 2009)Information Systems is regarded as an interdisciplinary science. Therefore, insights from the humanities are important for this discipline, although this is not always recognised or valued. One outstanding example is the ... -
Bootstrapping the conditional copula
(Elsevier, 2013)This paper is concerned with inference about the dependence or association between two random variables conditionally upon the given value of a covariate. A way to describe such a conditional dependence is via a conditional ... -
Borassus aethiopum Mart. (Arecaceae) in Limpopo province with a key to South African palms
(AOSIS, 2019)Background: Borassus aethiopum Mart. commonly occurs in many parts of tropical Africa, and in South Africa it is restricted to the Leydsdorp region where it is conspicuous along the Selati River. The species is sometimes ... -
Boundary layer nucleation as a source of new CCN in savannah environment
(EGU, 2013)The South African savannah region is a complex environment of air pollution and natural emissions influenced by a strong seasonal cycle in biomass burning and strong precipitation. However, the scarcity of long-term ... -
Bounded real lemma and structured singular value versus diagonal scaling: the free noncommutative setting
(Springer, 2016)The structured singular value (often referred to simply as μ) was introduced independently by Doyle and Safonov as a tool for analyzing robustness of system stability and performance in the presence of structured uncertainty ... -
Bow shocks in a newly discovered maser source in IRAS 20231+3440
(Oxford Univ Press, 2017)From measuring the annual parallax of water masers over 1.5 yr with VLBI Exploration of Radio Astrometry, we present the trigonometric parallax and corresponding distance of another newly identified water maser source ... -
Brassicacea-based management strategies as an alternative to combat nematode pests: a synopsis
(Elsevier, 2016)Nematode pests parasitise and cause substantial crop yield and quality losses to a wide range of crops worldwide. To minimize such damage, the exploitation and development of alternative nematode control strategies are ... -
Brics currency volatility: confusion or indecision?
(Babes-Bolyai University of Cluj Napoca, 2011)The year 2008 will be remembered when the world experienced the biggest financial crisis since the depression of the 1930’s. The years that followed 2008 will be remembered as the years of uncertainty about sustainable ... -
Broad-band reflection spectroscopy of MAXI J1535-571 using AstroSat: estimation of black hole mass and spin
(Oxford Univ Press, 2019)We report the results from AstroSat observations of the transient Galactic black hole X-ray binary MAXI J1535–571 during its hard-intermediate state of the 2017 outburst. We systematically study the individual and joint ... -
Broadband pulsations from PSR B1821-24: implications for emission models and the pulsar population of M28
(IOP Publishing, 2013)We report the Fermi Large Area Telescope discovery of γ-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737−3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV ... -
Brominated flame retardants in wild bird eggs from the industrialised heartland of South Africa
(Taylor & Francis, 2020)Brominated flame-retardants (BFRs), including polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCD), were analysed in 77 eggs of 13 wild bird species from Gauteng and northern Free State (the industrial ... -
Browsing intensity of herbaceous forbs across a semi-arid savanna catenal sequence
(Elsevier, 2015)Ecological models to explain savanna heterogeneity and functioning weakly represent herbaceous forbs, which inevitably created knowledge gaps regarding the diversity and ecology of forbs. Forbs constitute over 70% of ... -
Bryobia abyssiniae (Prostigmata: Tetranychidae), a new species from the highlands of Ethiopia
(Taylor & Francis, 2016)Bryobia abyssiniae Fashing & Ueckermann, a recently discovered species, is described using DNA-barcoding as well as morphological features of the adult female and all post-embryonic instars. The species is characterized ... -
Buakea (Lepidoptera: Noctuidae), a new genus of African stem borers: morphological, ecological and molecular data
(Entomological Society of Southern Africa, 2011)A new genus of African stem borers of the subtribe Sesamiina (Lepidoptera: Noctuidae), Buakea gen. n., is described as well as the three species it includes, two new, B. venusta sp. n. and B. kaeuae sp. n., and a species ... -
Buffer nitrogen solubility, in vitro ruminal partitioning of nitrogen and in vitro ruminal biological activity of tannins in leaves of four fodder tree species
(Wiley, 2014)This study explores the chemical composition, buffer N solubility, in vitro ruminal N degradability and in vitro ruminal biological activity of tannins in leaves from Gliricidia sepium, Leucaena leucocephala, Morus alba ... -
Building blocks in Planning research methodology : a roadmap to research design options
(Sun Media, 2022)Making sense of the myriad of available research design options is generally an arduous task for researchers. Proper research design is, subsequently, often neglected in Planning research, resulting in superficial research ... -
Building Capacity and Developing Human capital
(Routledge Taylor & Francis Group, 2012)There is a growing consensus on the potential for information and communications technologies (ICTs) to support socio-economic development in sub-Saharan Africa (SSA). Universities as providers of higher education are ...