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We determined the effect of phosphite application as a high-volume spray to the understorey, and injection of overstorey species, on disease front extension and rate of extension of Phytophthora cinnamomi in Banksia woodland. Burning of the trial site by the owner gave an unplanned effect of fire on phosphite treatment. The five phosphite treatments were no(More)
Previous studies have demonstrated that His 12 plays a major role in the pH-dependent stability of the helix formed by the isolated C-peptide (residues 1-13 of ribonuclease A). Here, amino acid replacement experiments show that His 12+ stabilizes the C-peptide helix chiefly by interacting with Phe 8. The Phe 8 ... His 12+ ring interaction is specific for(More)
Two models have been considered for the helix-stabilizing Phe-His+ interaction in C-peptide: (1) the H-bond model in which His+ acts as an H-bond donor and the aromatic ring of Phe acts as an acceptor, and (2) a helix dipole model, in which Phe constrains His so that there is a stronger interaction between His+ and the helix dipole. To decide between these(More)
The expression of the type II topoisomerase from Drosophila melanogaster was studied during development and in tissue culture cells. RNA blot and protein blot analyses using probes specific for Drosophila topoisomerase II show that the enzyme is developmentally regulated. Levels of both RNA transcript and protein appear highest during early embryogenesis(More)
Interactions between the alpha-helix peptide dipoles and charged groups close to the ends of the helix were found to be an important determinant of alpha-helix stability in a previous study. The charge on the N-terminal residue of the C-peptide from ribonuclease A was varied chiefly by changing the alpha-NH2 blocking group, and the correlation of helix(More)
Changes in plant species richness and composition, vegetation structure, ecosystem functioning and soil nutrients following invasion of Banksia woodland and Eucalyptus marginata forest biomes by the introduced soilborne multihost plant pathogen Phytophthora cinnamom were determined using space-for-time substitution of diseased and adjoining healthy areas.(More)
Longevity of effectiveness of stem-injected phosphite against Phytophthora cinnamomi was determined in two ways. Injected and not injected Banksia grandis and Eucalyptus marginata were challenge inoculated with P. cinnamomi at different times over an 8-year period. The mortality of injected and not injected B. attenuata and B. grandis was monitored over a(More)
There were two experiments in which three phosphite concentrations were sprayed onto the foliage of either Banksia brownii, B. baxteri or B. coccinea naturally infected with Phytophthora cinnamomi in the Esperance Plains bioregion of Western Australia, or B. grandis artificially infected with P. cinnamomi in Eucalyptus marginata forest of south-western(More)
The remote and sparsely populated Kimberley region is a major centre of endemism in the Australian monsoonal tropics that is threatened by uncontrolled fire following the disruption of Aboriginal burning practices. A recent study of the ant fauna of the Mitchell Falls area of the northern Kimberley revealed that 44 % of the species are known only from the(More)