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Effects of Artemisia afra leaf extracts on seed germination of selected crop and weed species
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. Ammann --- Department of Agronomy, Republic of South Africa P.J. Pieterse --- Department of Agronomy, Republic of South AfricaHerbicide resistance in weeds is a phenomenon threatening sustainable cereal production in the winter rainfall region of South Africa. Every possible weed control measure that may be used to complement chemical weed control measures should be investigated. The effect of... -
Phytochemical content, antioxidant capacity and physicochemical properties of pomegranate grown in different microclimates in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Asanda Mditshwa --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South Africa OlaniyiA Fawole --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South Africa Fahad Al-Said --- Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultanate of Oman Rashid Al-Yahyai --- Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultanate of Oman UmezuruikeL Opara --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South AfricaWe investigated the antioxidant and physicochemical properties of pomegranate (Punica granatum cv. Bhagwa) fruit grown in three microclimates in South Africa. The physicochemical properties of fruit peel and arils differed among the growing locations, including weight and redness color of... -
Condensed tannin in Eragrostis chloromelas leaves deters feeding by a generalist grasshopper
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J. Dini --- Department of Zoology, Republic of South Africa N. Owen‐Smith --- Department of Zoology, Republic of South AfricaWe investigated the feeding responses of a generalist grasshopper, the brown locust (Locusta pardalina), to leaves of the grass Eragrostis chloromelas differing in polyphenol content. For three specimens of E. chloromelas, the presence of condensed tannin in epidermal cells was... -
Preliminary assessment of oestrogenic activity in water sources in Rietvlei Nature Reserve, Gauteng, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NH Aneck-Hahn MS Bornman C de JagerA preliminary assessment was made of oestrogenic activity in water sources in the Rietvlei Nature Reserve, from which water is supplied to the metropolitan area of Pretoria. Single samples were extracted from seven sites using a solid phase C18 cartridge... -
Energy, chemicals and carbon: future options for the Eucalyptus value chain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S ChristieThis paper examines the current Eucalyptus value chain and the possible drivers that may impact upon it. The potential consequences of climate change on the growth and yield of Eucalyptus are discussed and the impact of the security of oil... -
Steroid hormone concentrations and physiological toxicity of water from selected dams in Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Faul --- Department of Biological Sciences, Namibia E Julies --- Department of Biological Sciences, Namibia EJ Pool --- Department of Medical Biosciences, South AfricaNamibia is a semi-arid to arid country and has most of its surface water in dams built on ephemeral rivers. Whilst water quality is often measured in terms of bacterial contamination and general physico-chemical characteristics, this study extends water quality... -
Health assessment of freshwater fish species from Albasini Dam, outside a DDT-sprayed area in Limpopo province, South Africa: a preliminary study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaDuring 2006 to 2008, the water, sediment and fish in Albasini Dam, used as a reference site outside a DDT-sprayed area, had been found to be as affected as those in the nearby DDT-sprayed area were. Accordingly, the aim of... -
Nutritional quality of baby spinach (
Spinacia oleracea L. ) as affected by nitrogen, phosphorus and potassium fertilisationItem type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Bongekile O Zikalala --- Department of Agriculture and Animal Health, South Africa Mpumelelo Nkomo --- Department of Agriculture and Animal Health, South Africa Hintsa Araya --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Wonder Ngezimana --- Marondera College of Agricultural Sciences and Technology, Zimbabwe Fhatuwani N Mudau --- Department of Agriculture and Animal Health, South AfricaBaby spinach is a nutritious vegetable rich in phytochemicals and minerals. Cultural practices such as fertilisation have an impact on the nutritional composition of vegetables. Hence, the current study investigated the responses of the chemical composition of baby spinach to... -
Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Teta --- Department of Environmental Science and Health, Zimbabwe; Current address: Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa BF Holbech --- Institute of Biology, University of Southern Denmark, Denmark L Norrgren --- Department of Pathology, Faculty of Veterinary Medicine, Sweden YS Naik --- Research and Innovation, ZimbabwePeri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their... -
Occurrence and distribution of organochlorine pesticide residue levels in water, sediment and aquatic weeds in the Nyando River catchment, Lake Victoria, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Abong’o --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, Kenya SO Wandiga --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, Kenya IO Jumba --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, KenyaSamples of water, sediments and aquatic weeds were collected from 26 sites in the Nyando River catchment of the Lake Victoria basin in 2005–2006. The objective was to investigate levels of organochlorine pesticides that have either been banned or are... -
Nutritional values and chemical composition of tropical pastures as potential sources of α-tocopherol and condensed tannin
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jalise F Tontini --- Graduate Program in Animal Science, Agronomy College, Brazil Cesar HEC Poli --- Graduate Program in Animal Science, Agronomy College, Brazil Viviane S Hampel --- Graduate Program in Animal Science, Agronomy College, Brazil Alessandro P Minho --- Embrapa Southeast Livestock, Brazilian Agricultural Research Corporation, Ministry of Agriculture, Brazil James P Muir --- Texas AgriLife Research, USATropical pastures can be important natural sources of antioxidant compounds and may impact production and quality of animal protein with repercussions on human health. The objective of this study was to evaluate the concentrations of α-tocopherol, condensed tannin (CT) and... -
Threats posed by xenoestrogenic chemicals to the aquatic ecosystem, fish reproduction and humans: a review
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Badamasi --- , Uganda R Odong --- , Uganda C Masembe --- , UgandaXenoestrogens mimic and interfere with natural functions of oestrogens and adversely affect fish reproduction. Pesticides, plastics, wastewaters and pharmaceuticals are sources of xenoestrogens, and are carried through surface runoffs to water bodies at concentration levels that are harmful to aquatic... -
Endocrine-disrupting activity of the fungicide mancozeb used in the Vhembe District of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MF Seshoka --- , South Africa MC van Zijl --- , South Africa NH Aneck-Hahn --- , South Africa IEJ Barnhoorn --- , South AfricaMany chemicals released into the environment are believed to disrupt normal endocrine functions in humans and animals. A major group of endocrine disrupting chemicals (EDCs) that could be responsible for reproductive defects are those that mimic natural oestrogens, known as... -
Adherence to safety practices and risks associated with toxic chemicals in the research and postgraduate laboratories at Sefako Makgatho Health Sciences University, Pretoria, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Liziwe Lizbeth Mugivhisa --- , South Africa Khanyi Baloyi --- , South Africa Joshua Oluwole Olowoyo --- , South AfricaThe study investigated the knowledge of postgraduate students in the Biology, Chemistry and Biochemistry departments regarding safety practices, protective measures and risks associated with toxic chemicals in the postgraduate and research laboratories. The study was exploratory and was conducted through... -
Maize farmers’ perceptions of the use of agrochemicals and their impact on the environment: A case study of Iringa District Council, Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Caphlene Japhet Peter --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, Tanzania Sospeter Jibunge Charles --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, Tanzania Michael Elias Mgalula --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, TanzaniaThis study examines farmers’ perceptions of agrochemical use in maize production and their harmful environmental effects. A convergent parallel mixed design was used to collect quantitative data from 254 respondents via structured interviews and qualitative data through in-depth interviews and...