David Mackerras

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A double-blind, placebo-controlled, randomized, factorial study using a daily oral administration of 30 mg beta-carotene and/or 500 mg vitamin C was conducted in 141 women with colposcopically and histologically confirmed minor squamous atypia or cervical intra-epithelial neoplasia (CIN) I. Over approximately 2 years of follow-up, 43 lesions regressed to(More)
The occurrences of positive and negative polarity cloud-to-ground lightning flashes were detected by ground-based lightning flash counters CGR4 in Bris-bane, Australia. Positive (negative) flashes constituted 2–5 per cent (95–98 per cent) of total cloud-to-ground flashes. These results were compared with data obtained by a GPATS lightning location system(More)
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