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Effects of 17-α-estradiol on a free-living marine nematode community: a microcosm experiment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Essid --- Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, Tunisia F Boufahja --- Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, Tunisia H Beyrem --- Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, Tunisia P Aïssa --- Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, Tunisia E Mahmoudi --- Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, TunisiaA microcosm experiment was used to examine the effects of 17-α-estradiol on a nematode community. Four 17-α-estradiol concentrations (0.15, 0.31, 0.62 and 1.24 ppm) were tested, and effects were examined after 30 days. Significant differences were noted between nematode assemblages... -
The impact of insulin resistance, gender, genes, glucocorticoids and ethnicity on body fat distribution
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: NJ Crowther --- Department of Chemical Pathology, National Health Laboratory Service, South Africa WF Ferris --- Department of Medicine, Faculty of Health Sciences, South AfricaThe metabolic consequences of obesity are highly dependent on body fat distribution and total body fat mass. Visceral adipose tissue in particular has been found to play an important aetiological role in obesity-related disorders. The contrasting fat distribution between genders,... -
Menopause and its effect on the female lower urinary tract
Item type: Journal Article • Journal: South African Family Practice • Authors: EW Henn --- Department of Obstetrics and Gynaecology, South AfricaSignificant hormonal changes occur at the time of menopause and this has an impact on all oestrogen-sensitive tissue. The female lower urinary tract (LUT) is no exception. Decreasing levels of oestrogen characteristic of the menopause produce symptomatic, histological and functional... -
Seasonal variation in gonadal steroids of males and females in the Cape mole-rat (Georychus capensis): the potential for opportunistic breeding
Item type: Journal Article • Journal: African Zoology • Authors: M. K. Oosthuizen --- Department of Zoology and Entomology, South Africa N. C. Bennett --- Department of Zoology and Entomology, South AfricaUrinary testosterone concentrations in males and urinary progesterone and oestradiol concentrations in females were measured in the Cape mole-rat (Georychus capensis) and compared for the summer and winter periods. The Cape mole-rat breeds seasonally, with sexual activity and subsequent pregnancy... -
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... -
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...