Linda de Jager

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The effect of stress induced by an electric field on the adrenal gland cortex of mice was examined by means of corticosterone serum assay and evaluation of the lipid profile of the different zones of the cortex. Six generations of experimental mice were exposed to a 10 kV/m electric field from conception and corresponding control groups were sham exposed.(More)
A double blind study on BALB/c mice was conducted to examine the effects of extremely low-frequency electromagnetic fields on fertility. The mice were continuously exposed or sham-exposed from conception for two generations to magnetic fields varying between 0.5 and 77 muT. Biological parameters related to fertility were evaluated. Serum testosterone levels(More)
This study determines the prevalence of types of sicknesses and diseases affecting patients visiting health service facilities and the available health services within the Selebi Phikwe Ni-Cu mine area, Botswana. Through the administration of questionnaires and structured questions, attempts were made to establish and verify the existing human health(More)
Disruption of the normal melatonin rhythm has many implications in health and disease. Exposure to magnetic fields is alleged to suppress nocturnal melatonin production, which could implicate magnetic fields in the development of, for example, breast cancer. Magnetic fields of overhead powerlines allegedly pose a risk in the development of childhood(More)
There is still uncertainty whether extremely low frequency electromagnetic fields (ELF-EMF) can induce health effects like immunomodulation. Despite evidence obtained in vitro, an unambiguous association has not yet been established in vivo. Here, mice were exposed to ELF-EMF for 1, 4, and 24 h/day in a short-term (1 week) and long-term (15 weeks) set-up to(More)
The optic nerves of experimentally produced cyclopic and synophthalmic embryos of Gallus domesticus were studied to evaluate the course of the optic nerves in these abnormal circumstances. From this study it can be concluded that the course of the optic nerves appears largely to be a result of directional growth and that when decussation does occur in the(More)
The objective of our study was to determine the effect of an electric field (EF) on the life-span of mice. Male and female mice were paired and separated into two experimental groups: EF exposed and controls. The exposed mice were subjected to a 50 Hz, 10 kV/m electric field for 20 h/day. Offspring from both groups were identified as generation one and(More)
We present a patient with acute sinusitis whose CT scan showed a ring-enhancing lesion within the orbit typical of an orbital subperiosteal abscess. On exploration of the orbit, there was no pus present but a tumour was found, which on histological examination was found to be a rhabdomyosarcoma. The clinical signs and CT characteristics of orbital(More)
  • Dr . Georges - Ivo E . Ekosse, Linda de Jager, Dr Dawid van den Heever, Mr Ernst Vermaak
  • 2006
This study focused on evaluating the pulmonary health status of 100 residents of the Selebi Phikwe nickelcopper (Ni-Cu) mine area, Botswana. It presents the results of spirometry tests, which were undertaken primarily to investigate whether mining activities have affected the pulmonary health status of residents. Questionnaires which covered gender, age,(More)
Abattoir waste disposal must be carefully managed because the wastes can be a source of food-borne diseases (Nemerow & Dasgupta Industrial and Hazardous Waste Treatment, p. 284, Van Nostrand Reinhold, New York, 1991; Bradshaw et al. The Treatment and Handling of Wastes, p. 183, The Royal Society, Chapman & Hall, London, 1992). Disposal of food that has been(More)