Search
Search results for
We found
7 results for you
-
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... -
Exfoliative liver cytology in Oreochromis mossambicus as a bio-assessment tool for aquatic pollution
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Mokae --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South AfricaThe use of exfoliative cytology as a bio-assessment tool was evaluated to (1) identify and describe different cell types of normal liver cytology of Oreochromis mossambicus, (2) identify and describe changes in the cell types after exposure to cadmium and... -
Bioaccumulation of cadmium in the ascidian Styela clava (Herdman 1881)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Jiang --- Department of Biochemical Engineering, China Z Yu --- Department of Biochemical Engineering, China CH Wang --- Department of Biochemical Engineering, ChinaThe processes of bioaccumulation and elimination of cadmium by tissues of Styela clava (Herdman 1881) were investigated based on a semi-static two-compartment model. The kinetic parameters (accumulation rate constant k 1, elimination rate constant k 2, bioconcentration factor BCF, biological... -
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... -
Behavioural response as a reliable measure of acute nanomaterial toxicity in zebrafish larvae exposed to a carbon-based versus a metal-based nanomaterial
Item type: Journal Article • Journal: African Zoology • Authors: Sarel J Brand --- Unit for Environmental Sciences and Management, South Africa Tarryn L Botha --- Unit for Environmental Sciences and Management, South Africa Victor Wepener --- Unit for Environmental Sciences and Management, South AfricaProduction, use and disposal of products containing nanomaterials can lead to an increased presence of these particles in the environment and exposure to the organisms found there. It is therefore becoming increasingly necessary to develop methods for screening these materials... -
Differences in metal compositions and concentrations of sympatric predatory fish and squid from the South Atlantic Ocean
Item type: Journal Article • Journal: African Zoology • Authors: Ryan C Uren --- , South Africa Francois Bothma --- , South Africa Carl D van der Lingen --- , South Africa Hindrik Bouwman --- , South AfricaMetals occur naturally in the environment and in organisms. Organisms at higher trophic levels may contain metals at elevated concentrations, as a result of accumulation from anthropogenic and natural sources, potentially making them more susceptible to detrimental effects, as well... -
Cadmium exposure induces testicular oxidative damage and histopathological changes in the freshwater leech Limnatis nilotica (Savigny, 1822): the protective role of salicylic acid
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ichrak Khaled --- University of Gafsa, Tunisia Issam Saidi --- University of Gafsa, Tunisia Raja Ben Ahmed --- Université de Tunis El Manar, Tunisia Ramzi Amari --- University of Gafsa, Tunisia Waleed Aldahmash --- King Saud University, Saudi Arabia Octavian Pacioglu --- National Institute of Research and Development for Biological Sciences, Romania Najla Hfaiedh --- University of Gafsa, Tunisia Abdel Halim Harrath --- King Saud University, Saudi ArabiaThe present study examined the histopathological changes and some parameters of oxidative stress in the testes of the freshwater leech Limnatis nilotica, following their exposure to 50 µg l−1 of cadmium (Cd). The protective effects of salicylic acid (SA) in...