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Concentration, accumulation and uptake rate of Cu, Fe, Mn and Zn by wheat under irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, Republic of South Africa A. T.P. Bennie --- Department of Soil Science, Republic of South AfricaThe objective of this study was to obtain information on the Cu, Fe, Mn and Zn uptake patterns of wheat (Triticum aestivum L.) grown under normal irrigation farming conditions. Except for irrigation scheduling, the 13 farmers on whose farms the... -
A note on copper bioaccumulation in Mozambique tilapia, Oreochromis mossambicus (Osteichthyes: Cichlidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Irene Naigaga Horst KaiserCopper (Cu) is one of the most commonly reported metal pollutants in African water bodies, but there are few studies on African freshwater fish species of copper accumulation and copper toxicity. Adult O. mossambicus were exposed to 0mg l−1 (control)... -
Acute effects of Cu on oxygen consumption and 96 hr-LC50 values in the freshwater fish Tilapia sparrmani (Teleostei: Cichlidae) in Mooi River hard water, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ van Aardt Mynhardt HoughThe median lethal copper (Cu) concentration (96 hr-LC50) values for acute Cu toxicity for Tilapia sparrmanii (live mass: 30 ± 8g) in Mooi River hard water of dolomitic origin at 20 °C, pH 7.9, was 68.1 μmol l−1. At this... -
The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, Liza dumerili
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HM Mzimela --- Coastal Research Unit of Zululand, Department of Zoology, South Africa V Wepener --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaToxicity bioassays were conducted on groovy mullet, Liza dumerili, using copper and lead, in order to assess how these metals affected their blood haematology and acid-base balance. Short-term (96 hours) exposure to lead caused significantly more haematological response [PCO2] than... -
The effect of copper and zinc at neutral and acidic pH on the blood coagulation of Oreochromis mossambicus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Nussey --- Department of Zoology, South Africa J HJ van Vuren --- Department of Zoology, South Africa HH du Preez --- Department of Zoology, South AfricaThe effect of copper and zinc on fish blood coagulation under alkaline and acidic conditions and the possible occurrence of disseminated intravascular clotting under these conditions have been poorly studied to date. -
The effect of copper and zinc at neutral and acidic pH on the general haematology and osmoregulation of Oreochromis mossambicus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Nussey --- Department of Zoology, South Africa J HJ van Vuren --- Department of Zoology, South Africa HH du Preez --- Department of Zoology, South AfricaThe objective of this study was to determine the effect of sublethal copper and zinc concentrations at a neutral and an acidic pH, on selected haematological parameters as well as on the total osmolality and electrolyte concentrations of Oreochromis mossambicus... -
Copper, zinc and iron concentrations in water, sediment and Cynothrissa mento (Regan 1917) from Ologe Lagoon, Lagos, Nigeria: a preliminary survey
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CA Kumolu-Johnson --- Department of Fisheries, Faculty of Science, Nigeria PE Ndimele --- Department of Fisheries, Faculty of Science, Nigeria SL Akintola --- Department of Fisheries, Faculty of Science, Nigeria CC Jibuike --- Department of Microbiology and Botany, Faculty of Science, NigeriaThe levels of Cu, Fe and Zn in water, sediment and Cynothrissa mento, a commercially important fish species, were investigated from April 2007 to March 2008 at three sites in Ologe Lagoon. Metal levels in the water column and C... -
Effects of heavy metals on the development and survival of abalone Haliotis midae larvae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RL Stofberg --- Department of Conservation Ecology and Entomology, South Africa CA Simon --- Department of Botany and Zoology, South Africa RG Snyman --- Department of Biodiversity and Conservation, Faculty of Applied Sciences, South AfricaDespite a growing abalone Haliotis midae industry in South Africa, few studies have measured the effects of heavy metals on larval survival and growth in the face of recent increases in marine pollution. The aim of this study was to... -
Acute toxicity of selected heavy metals to Oreochromis mossambicus fry and fingerlings
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TB Mashifane --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South Africa NAG Moyo --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South AfricaAcute toxicity of copper, lead and iron to tilapia Oreochromis mossambicus fry and fingerlings was tested using 24 h to 96 h static non-renewal toxicity tests. Three methods, probit analysis, Spearman–Karber and a linear regression model, were used to calculate... -
Comparative study of double-chamber microbial fuel cells (DC-MFCs) using Mfensi clay as ion-exchange-partition: Effect of electrodes
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: R.Y. Tamakloe --- Department of Physics, Ghana T. Opoku-Donkor --- Department of Physics, Ghana M.K.E. Donkor --- Department of Physics, Ghana H. Agamasu --- Department of Physics, GhanaAn alternative answer to the vital issues of electricity production and wastewater treatment leads to the application of microbial fuel cells. This study has developed a low-cost double-chambered microbial fuel cell (MFC) for electricity generation, which can also be used... -
Optimization of copper nanoparticle biosynthesis process using aqueous extract of Andrographis paniculata
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Supratim Biswas --- Mineral Processing and Technology Research Centre, Department of Metallurgy Faculty of Engineering & The Built Environment, South Africa Suparna Chakraborty --- School of Materials Science and Nanotechnology, India Antoine F. Mulaba-Bafubiandi --- Mineral Processing and Technology Research Centre, Department of Metallurgy Faculty of Engineering & The Built Environment, South AfricaThe competency of aqueous extract of Andrographis paniculata (kalmegh) to reduce copper nitrate for the biosynthesis of copper nanoparticle (CuNPs) was investigated. The experiments were set up according to the design of experiment technique and the results were analyzed for... -
Spatial variability of selected soil micronutrients under smallholder crop production in Zanyokwe, Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alen Manyevere --- Department of Agronomy, South Africa Pardon Muchaonyerwa --- Discipline of Soil Science, School of Agriculture, Earth and Environmental Sciences, South Africa Pearson NS Mnkeni --- Department of Agronomy, South Africa Inos Dhau --- Department of Geography and Environmental Sciences, South AfricaUnderstanding spatial variability of soil nutrients, including that of micronutrients, is important for establishing best management practices in smallholder crop production. The objective of this study was to determine the status and spatial variability of potentially available zinc (Zn), copper... -
Fifty-five-year longevity for the largest member of the family Sparidae: the endemic red steenbras Petrus rupestris from South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AH Andrews --- , United States MJ Smale --- , South Africa PD Cowley --- , South Africa N Chang --- , South AfricaA previous study that explored the age and growth of red steenbras Petrus rupestris (Valenciennes, 1830), a large sparid (family Sparidae, seabreams or porgies) endemic to South Africa and reported to approach 2 m in length, provided estimates as a... -
Effects of chronic exposures of selected heavy metals on the glutathione S-transferase activity of freshwater snails Lymnaea natalensis in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Mnkandla --- Ecotoxicology Research Group, Department of Applied Biology and Biochemistry, Zimbabwe AH Siwela --- Ecotoxicology Research Group, Department of Applied Biology and Biochemistry, Zimbabwe N Basopo --- Ecotoxicology Research Group, Department of Applied Biology and Biochemistry, ZimbabweThe effect of the heavy metals (cadmium, copper, mercury and lead) on snail glutathione S-transferase (GST) was investigated in 2015. Groups of Lymnaea natalensis snails were exposed to heavy metals for 28 days at concentrations reportedly found in the Mguza... -
Colletotrichum gloeosporioides s.l. causes an outbreak of anthracnose of cacao in Ghana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EK Asare --- , Ghana O Domfeh --- , Ghana SW Avicor --- , Ghana P Pobee --- , Ghana Y Bukari --- , Ghana I Amoako-Attah --- , GhanaOutbreak of anthracnose of cacao (Theobroma cacao L.), covering an estimated total growing area of 248.47 hectares, occurred in parts of Ghana from July to October 2019. Disease samples were collected from the outbreak areas to isolate and identify the... -
Wider family in post-privatisation Zambia
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: James Musonda --- University of Liège, BelgiumThis article traces the economic and social dynamics animating kin-like relations amongst workers on the Zambian Copperbelt, their implications in everyday life and broader conceptions of family they engender. The article argues that the ability of mineworkers’ families to cope...