Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1311-1330 of 4855
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An early alert feedback system in learning
(IADIS, 2017)The fields of teaching and learning are evolving as a result of new techniques like blended-, online-, and exploratory learning being implemented. Lecturers need to ensure successful teaching and also create an environment ... -
Early science with the Karoo Array Telescope: a mini-halo candidate in galaxy cluster Abell 3667
(Oxford University Press, 2015)Abell 3667 is among the most well-studied galaxy clusters in the Southern hemisphere. It is known to host two giant radio relics and a head–tail radio galaxy as the brightest cluster galaxy. Recent work has suggested the ... -
Earthworm (Eisenia Fetida) bioassay to assess the possible effects of platinum tailings disposal facilities on the environment along a gradient
(ALÖKI Applied Ecological Research and Forensic Institute Ltd., 2008)Platinum mines produce large amounts of inorganic tailings containing high levels of metals which are disposed of on tailings disposal facilities (TDFs) and there is no information available on their possible effects on ... -
Earthworms and mesofauna from an isolated, alkaline chemical waste site in Northwest England
(Elsevier, 2017)Post-industrial sites across Europe may have developed over periods in excess of a century, often leading to poor nutrient soils with noxious constituents and extreme pH values. One such site, Nob End (Bolton, UK), a toxic ... -
Easterly wave contributions to seasonal rainfall over the tropical Americas in observations and a regional climate model
(Springer, 2020)Easterly waves (EWs) are important moisture carriers and their variability can impact the total May–November rainfall, defined as seasonal precipitation, over the Tropical Americas. The contribution of EWs to the seasonal ... -
Easy chairs: the conformational preferences of polyfluorocyclohexanes
(Royal Society of Chemistry, 2013)Polyfluorocyclohexanes present an interesting challenge to our current understanding of fundamental organic chemistry. In part to improve molecular mechanics methods and facilitate drug design, a systematic survey of ... -
EBL inhomogeneity and hard-spectrum gamma-ray sources
(IOP Publishing, 2017)The unexpectedly hard very-high-energy (VHE; E > 100 GeV) γ-ray spectra of a few distant blazars have been interpreted as evidence of a reduction of the γγ opacity of the universe due to the interaction of VHE γ-rays with ... -
The echo of pulmonary tuberculosis: mechanisms of clinical symptoms and other disease-induced systemic complications
(American Society for Microbiology, 2020)Clinical symptoms of active tuberculosis (TB) can range from a simple cough to more severe reactions, such as irreversible lung damage and, eventually, death, depending on disease progression. In addition to its clinical ... -
Eco-friendly synthesis of AgNPs using Verbascum thapsus extract and its photocatalytic activity
(Elsevier, 2016)A facile eco-friendly synthesis of silver nanoparticles (AgNPs) using Verbascum thapsus (V. thapsus) flower extract as reducing as well as stabilizing agent is reported. The morphology of the synthesized Ag-NPs was spherical ... -
Ecological genetics and host range expansion by Busseola fusca (Lepidoptera: Noctuidae)
(Oxford Univ Press, 2015)The host plant range of pests can have important consequences for its evolution, and plays a critical role in the emergence and spread of a new pest outbreak. This study addresses the ecological genetics of the indigenous ... -
Ecological guild and enzyme activities of rhizosphere soil microbial communities associated with Bt-maize cultivation under field conditions in North West Province of South Africa
(Wiley, 2017)Insecticidal proteins expressed by genetically modified Bt maize may alter the enzymatic and microbial communities associated with rhizosphere soil. This study investigated the structure and enzymatic activity of rhizosphere ... -
The ecological politics surrounding the downsizing and downgrading of public park: a reflection on the history of change of the Harare Gardens in Zimbabwe
(University of California Press, 2019)ABSTRACT The study of protected area downgrading and downsizing (PADD) in Africa has largely been confined to rustic and nature reserves outside urban boundaries. This study addresses the gap in research practice and puts ... -
The ecology and conservation of Thestor brachycerus brachycerus (Trimen, 1883): an aphytophagous miletine butterfly from South Africa
(Springer, 2015)The existing knowledge of the biology and ecology of the butterfly genus Thestor is summarised, and the conservation status of the Critically Endangered Thestor brachycerus brachycerus reviewed. The biotopes of two hitherto ... -
Economic synergy between rural off-farm income and households' poverty in Ekiti State, Nigeria
(Kamla-Raj, 2016)Off-farm enterprise is important for rural development and poverty alleviation. This study was undertaken to determine the economic synergy between off-farm income and farming households' poverty level. A total of 120 ... -
Economics of farming household's food intake and health-capital in Nigeria: a two-stage probit regression approach
(Western Illinois University, 2017)Persistent hunger, malnutrition, and public health problems inextricably threaten the ability of several countries to develop. The burdens of these trios on economic development in African continent cannot be overemphasized. ... -
Ecosystem services of urban green spaces in African countries: perspectives and challenges
(Springer Verlag, 2013)The concept of ecosystem goods and services is increasingly used to describe how biodiversity and ecosystems are linked to human well-being and that it should be placed at the core of sustainable urban development. ... -
Ecotoxicity of mine tailings: unrehabilitated versus rehabilitated
(Springer, 2018)Earthworms are bioindicators of soil pollution. The ecotoxicity of tailings from selected gold mines in South Africa was investigated utilizing Eisenia andrei bioassays and biomarkers. Samples were obtained from unrehabilitated, ... -
Ecotoxicological assessment of chemical fumigants utilising an earthworm (Eisenia andrei) bioassay and soil microbial communities
(Springer, 2017)Fumigation is an important crop protection practice employed to control soil pathogens and diseases. Metham sodium and cadusafos are two commonly used soil fumigants for this purpose. However, little information is available ... -
Ecotoxicological effects of aflatoxins on earthworms under different temperature and moisture conditions
(MDPI AG, 2022)Aflatoxin contamination remains one of the most important threats to food safety and human health. Aflatoxins are mainly found in soil, decaying plant material and food storage systems and are particularly abundant during ...
