By Chamberlain C.J.
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Extra info for A Phylogenetic Study of Cycads (1915)(en)(5s)
No-one can give an unequivocal assurance about the effects of any particular herbicide on human health. Even in the absence of immediate (acute) effects, it might take 40 years for a potential carcinogen to act in enough people for it to be detected as a cause. Removal of chemicals from the list of those formerly approved is occurring all the time with the benefit of hindsight. 16 Accordingly, precautions should always be taken to minimise exposure to any agricultural chemical. T H E H A Z A R D S O F H E R B I C I D E – R E S I S TA N T P L A N T S • 49 INSECTICIDES AS HERBICIDES Just as the deleterious effects of herbicides are not confined to plants, so other pesticides can incidentally diminish plant growth.
3 The oft-repeated claim that only a single gene is being transferred has to be set against the knowledge that vectors or constructs used to transfer a desired gene always include several genes. Promoter sequences that respond to signals to switch on the gene and termination sequences that indicate the end of transcription must be included. In addition, reporter genes are included so that cells likely to have integrated the new genes can be identified simply. A construct is generally made to resemble a bacterial plasmid, with all the components arranged in a circle.
The last bastion of use is in South Australia, where it is still favoured for use on lawns being converted into ‘organic’ gardens13 and for keeping sultanas free of insects. In the late 19th and early 20th century, spraying with sulfuric acid or cyanide was also tried. These universal poisons have obvious drawbacks. The use of chlorates (potassium or sodium salts) began in Queensland in 1901. Potassium chlorate was used against prickly pear 46 • SEEDS OF CONCERN (Opuntia stricta) with limited effect.