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Gill damage, metallothionein gene expression and metal accumulation in Tilapia sparrmanii from selected field sites at Rustenburg and Potchefstroom, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Daléne van Heerden Peet Jansen van Rensburg Mikko Nikinmaa André VoslooFish were collected from field sites in the mining and agricultural areas of Potchefstroom and Rustenburg, North-West Province, South Africa. Water and sediment samples from each site, together with fish muscle and gills, were analysed by Inductively Coupled Plasma Mass... -
Accumulation of hepatic Hsp70 and plasma cortisol in Oreochromis mossambicus following sublethal metal and DDT exposure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SS Mlambo --- Centre for Aquatic Research, Zoology Department, South Africa JHJ van Vuren --- Centre for Aquatic Research, Zoology Department, South Africa R Basson --- Centre for Aquatic Research, Zoology Department, South Africa B Grant --- Centre for Aquatic Research, Zoology Department, South AfricaHeat shock response in Oreochromis mossambicus livers was measured, using antibodies specific to Hsp70 family members, by an immunoblotting protocol. The hepatic isoforms Hsp70, Hsp74 and Hsp76 were identified and quantified from copper exposures. Long-term DDT exposure did not result... -
Polychlorinated biphenyl accumulation and hepatic EROD activity in golden grey mullet Liza aurata from Tunis Bay, southern Mediterranean
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Masmoudi --- UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Tunisia MS Romdhane --- , Tunisia S Khériji --- UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Tunisia M El Cafsi --- UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, TunisiaLiza aurata was used as a bioindicator species to monitor contamination by organic xenobiotics of estuarine water at the outlet of Khélij channel [canal], Tunisia, from November 2002 to December 2003. Polychlorinated biphenyl (PCB) concentrations, including coplanar congeners, were measured... -
Histological changes in the gills of Clarias gariepinus (Teleostei: Clariidae) from a polluted South African urban aquatic system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JC van Dyk --- Centre for Aquatic Research, Department of Zoology, South Africa MJ Marchand --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South Africa IEJ Barnhoorn --- Department of Urology, South Africa MS Bornman --- Department of Urology, South AfricaA semi-quantitative histological assessment was used to investigate histological changes in the gills of Clarias gariepinus from Marais Dam and Rietvlei Dam near Pretoria, which receive effluent from sewage treatment plants and industries, as well as runoff from informal settlements... -
Cellular responses of the starfish Parvalustra exigua to metal pollution in False Bay, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Sophié A. Reinecke --- Department of Botany and Zoology, South Africa Adriaan J. Reinecke --- Department of Botany and Zoology, South AfricaThe cushion sea star Parvalustra exigua from five sites along the shore of False Bay on the southern coast of South Africa was studied using two cellular biomarkers, the neutral red retention assay (NRR) and the lysosomal destabilization assay (DI)... -
Preliminary investigation of a new serum marker for ovarian cancer
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: M H Botha --- Department of Obstetrics and Gynaecology, South Africa H Veenstra --- MRC Centre for Molecular and Cellular Biology, Stellenbosch University, South Africa W K Van der Merwe --- Department of Obstetrics and Gynaecology, South Africa R H Laeng --- Department of Pathology, Switzerland J Nevin --- Department of Gynaecological Oncology, South Africa L Van Wijk --- Department of Radiation Oncology, South Africa R Soeters --- Department of Gynaecological Oncology, South Africa S Bird --- Department of Nuclear Medicine, South Africa P D Van Helden --- MRC Centre for Molecular and Cellular Biology, Stellenbosch University, South AfricaObjectives: The long-term survival rate of patients with carcinoma of the ovary is poor, because this condition is usually diagnosed at an advanced stage of the disease. A reliable diagnostic and screening test is still lacking. Therefore, a serological test... -
High-risk human papillomavirus screening and testing with immunohistochemical surrogate biomarkers: an alternative to polymerase chain reaction
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: L J Van Bogaert --- Pathologist National Health Laboratory Service and University of Limpopo, -
Physiological response of one of South Africa’s premier freshwater sport angling species, the Orange-Vaal smallmouth yellowfish Labeobarbus aeneus, to catch-and-release angling
Item type: Journal Article • Journal: African Zoology • Authors: Nico J Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, South Africa Ruan Gerber --- Department of Zoology, Kingsway Campus, South Africa Richard Greenfield --- Department of Zoology, Kingsway Campus, South Africa Glyn Howatson --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, South AfricaThe practice of catch-and-release fishing has been widely promoted by angling fraternities as a fisheries manage- ment tool. The aim of this investigation was to determine the physiological response of Orange-Vaal smallmouth yellowfish, Labeobarbus aeneus, to catch-and-release angling in the... -
Histopathological biomarkers and genotoxicity in gill and liver tissues of Nile tilapia Oreochromis niloticus from a polluted part of the Nile River, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Baiomy --- Zoology Department, EgyptFish health is affected by water pollution. Oreochromis niloticus collected during summer 2014 from El-Serw, a polluted site on the Nile River, were compared with fish from a reference site, El-Zamalek. Histopathological changes were detected in gill and liver tissue... -
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... -
Assessment of delirium in the intensive care unit
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: TF Kallenbach --- Department of Anaesthesia, Charlotte Maxeke Johannesburg Academic Hospital and Faculty of Health Sciences, South Africa LA Amado --- Department of Anaesthesia, South AfricaDelirium poses a significant burden on our healthcare, with patients in the intensive care unit (ICU) at an increased risk for developing this disorder. In addition, the ICU environment poses unique challenges in the assessment of delirium. It is paramount... -
Physiological response to angling of Africa’s premier freshwater angling species, the tigerfish Hydrocynus vittatus
Item type: Journal Article • Journal: African Zoology • Authors: Ruan Gerber --- Water Research Group, Unit for Environmental Sciences and Management, South Africa Glyn Howatson --- Water Research Group, Unit for Environmental Sciences and Management, South Africa Richard Greenfield --- Centre for Aquatic Research, Department of Zoology, South Africa Ina Wagenaar --- Centre for Aquatic Research, Department of Zoology, South Africa Nico Smit --- Water Research Group, Unit for Environmental Sciences and Management, South AfricaAngling fraternities widely promote catch-and-release (C&R) as a fisheries management tool. This study aimed to determine the physiological response of Africa’s premier freshwater angling species, the tigerfish Hydrocynus vittatus, to C&R angling in the Okavango Delta, Botswana. Standard angling techniques... -
Environmental influence on phytoplankton communities in the northern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow --- , South Africa T Lamont --- , South Africa D Louw --- , Namibia M-J Gibberd --- , South Africa R Airs --- , United Kingdom A van der Plas --- , NamibiaAn investigation of surface phytoplankton communities was undertaken on the shelf of the northern Benguela upwelling ecosystem during austral autumn (May) and spring (September), along latitudinal transects at 20° S and 23° S, from 2 to 70 nautical miles offshore,... -
Acute toxicity and adverse effects of aqueous and ethanol extracts of Parkia biglobosa pods on biochemical parameters of Clarias gariepinus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KA Bawa-Allah --- Environmental Toxicology Unit, Department of Zoology, Nigeria BO Akinnuoye --- Environmental Toxicology Unit, Department of Zoology, NigeriaThe acute toxicity of the aqueous and ethanol extracts of Parkia biglobosa pods against Clarias gariepinus was investigated under laboratory conditions. Agitated behaviours and respiratory distress were also observed during the exposure period. The adverse effects on biochemical parameters were... -
Biomarkers, shock index and modified early warning score among older medical hospital inpatients in Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: LA Adebusoye --- Chief Tony Anenih Geriatric Centre (CTAGC), Nigeria MO Owolabi --- Department of Medicine, College of Medicine, Nigeria A Ogunniyi --- Department of Medicine, College of Medicine, NigeriaBackground: Biomarkers, shock index and modified early warning score (MEWS) are of public health importance because identification and prompt attention to them have been found to reduce mortality among older patients on admission. -
Histological alterations of selected tissues (gill, liver, kidney and stomach) in two common fish species within two eutrophic peri-urban lakes in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Utete --- Department of Wildlife Ecology and Conservation, Zimbabwe N Mabika --- Department of Anatomy, Zimbabwe J Chiwara --- Department of Applied Biosciences and Biotechnology, Zimbabwe J Makaure --- Department of Applied Biosciences and Biotechnology, Zimbabwe C Phiri --- Department of Freshwater and Fishery Science, Zimbabwe SS Mlambo --- Department of Biotechnology Science, Zimbabwe N Muboko --- Department of Wildlife Ecology and Conservation, Zimbabwe J Tsamba --- Department of Biology, ZimbabwePollution threatens fish health in the eutrophic lakes, Chivero and Manyame, in Zimbabwe. Histopathological tissue alterations of two commonly consumed fish: catfish, Clarias gariepinus, and; tilapia, Oreochromis niloticus, from Lakes Chivero and Manyame were assessed between 2015 and 2016. Seventy-one... -
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... -
Comparison of oxidative stress biomarkers in Oreochromis mossambicus in minimally and highly disturbed aquatic environments in the Matabeleland region, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Z Makuvara --- , Zimbabwe J Marumure --- , Zimbabwe L Chapungu --- , Zimbabwe J Machingura --- , South Africa AH Siwela --- , ZimbabweOwing to their ability to provide a functional measure of organismal response to chemical stressors, oxidative biomarkers are useful in ecotoxicological studies to assess disturbance in aquatic environments. This study assessed the use of oxidative stress biomarkers in Oreochromis mossambicus... -
Residue loads in amphibians used as biomarkers of pesticide levels entering food chains in sub‐Saharan Africa
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: MichaelR.K. Lambert --- University of Greenwich, United KingdomResidues accumulate rapidly in amphibians to reach lethal levels. During previous years in Zimbabwe, total DDT residues from general agricultural contamination were at 3.90 ppm wet weight in Bufo gutturalis and 1.50 ppm in Ptychadena anchietae. Dieldrin residues in the... -
Risk of zinc deficiency among children aged 0–59 months in sub-Saharan Africa: a narrative review
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Mavis P Dembedza --- University of Zimbabwe, Zimbabwe Prosper Chopera --- University of Zimbabwe, Zimbabwe Tonderayi M Matsungo --- University of Zimbabwe, Zimbabwe