Showing papers by "James Cook University published in 1971"
TL;DR: This chapter discusses the stages of plant development for infection, factors affecting infection and symptom expression, and the role of environment in the development of resistance.
Abstract: Introduction -231 Economic importance -232 Stage of plant development for infection 236 Taxonomy and nomenclature -237 Symptomatology and pathological history -239 Life cycle -241 Factors affecting infection and symptom expression -243 Humidity, temperature, and light -244 Spore load -245 Plant nutrition 245 Plant age 246 Interaction with other diseases -246 Host range and pathogenic specialization -247 Host resistance and genetics of resistance -249 Co trol250 Resistant varieties -250 Seed treatments -251 Cultural practices -252 Cover spraying -253 Quarantine -253 Summary -253 Acknowledgments -254 Literature Cited -254
146 citations
01 Dec 1971
TL;DR: In this paper, it is suggested that optimum control of rock failure in any laboratory test is achieved when the closed loop feedback represents the most sensitive indicator of failure, and that any required experimental output can then be independently monitored.
Abstract: Optimizing the Control of Rock Failure in Servo-Controlled Laboratory Tests
Recent studies of rock failure have been made with a closed loop servo-controlled testing machine. Feedback from the failing specimen is electronically compared with a pre-determined program and the hydraulic system is continuously and automatically adjusted to ensure that feedback and program are coincident. It is suggested that optimum control of rock failure in any laboratory test is achieved when the closed loop feedback represents the most sensitive indicator of failure. Any required experimental output can then be independently monitored. This method was applied to a variety of rock specimens loaded in uniaxial compression using lateral displacement as feedback. It was possible to control the failure of some rocks which had failed explosively in previous tests where the axial displacement had been programmed to increase monotonically.
98 citations
TL;DR: In this article, the starch was determined in the pasture legume Stylosanthes humilis (Stylo) by hydrolysis with amylo-glucosidase and subsequent analysis for glucose with glucose oxidase.
Abstract: Starch has been determined in the pasture legume Stylosanthes humilis (Stylo) by hydrolysis with amylo-glucosidase and subsequent analysis for glucose with glucose oxidase. Prior gelatinisation of starch granules within the plant sample by water at 130°c gave low values and it was concluded that the complete solubilisation of starch by alkali was necessary, with subsequent neutralisation of the extract with acetic acid. It was shown that the alkali also extracted material which inhibited one or more of the enzymes involved in the subsequent glucose analysis, but this inhibition was removed by treatment of the extract with charcoal. Under the above conditions the high acetate concentration decreased the efficiency of the final glucose analysis, but this effect was readily corrected by use of appropriate blank solutions. The proposed method of starch analysis is relatively economical in time compared with previous methods and is believed to give more meaningful values for plants with low starch content.
90 citations
TL;DR: This phase has been suggested as the cause of the recent plague of the animal in the Pacific, for large females release many millions of eggs each spawning season and any factor which slightly reduces the mortality rate during planktonic life and settlement greatly increases recruitment into the starfish populations.
Abstract: LITTLE is known of the factors influencing survival during the planktonic phase of Acanthaster planci (Linnaeus), the crown of thorns starfish, apart from an observation of fish eating newly released eggs1 But it is not surprising that this phase has been suggested as the cause of the recent plague of the animal in the Pacific2–4, for large females release many millions of eggs each spawning season1 and any factor which slightly reduces the mortality rate during planktonic life and settlement greatly increases recruitment into the starfish populations
65 citations
TL;DR: Aqueous solutions of hemicelluloses from a number of different plant sources have been examined for time and temperature-dependent effects by using viscometry, ultracentrifugation, gel filtration, light transmission, and optical rotation.
48 citations
TL;DR: A study has been made of the effectiveness and reproducibility of the fractionation of hemicelluloses by fractional precipitation with ethanol, and by ion exchange on cellulose, dextran, and polystyrene derivatives.
43 citations
TL;DR: In this article, a novel method was developed for isolation of hemicellulose from alkaline extracts of plants, which combines dialysis and ion exchange and achieved state-of-the-art results.
33 citations
TL;DR: These non-linear terms are shown to be significant for vessels of the distensibility of the dog or sheep thoracic aorta, and to have little or no effect in the less distensible vessels such as the dog femoral artery.
Abstract: The pressure- relation of blood in the larger vessels of the mammalian arterial system contains non-linearities associated with the convective inertia forces, and the wall elastic properties. In the equations of the one-dimensional arterial model there are two non-linear terms expressing the convective inertia forces of the motion and the vessel taper due to pressure gradient and wall distensibility. These terms vanish in the case of an initially untapered but ditensible vessel, the terms are shown to be significant for vessels of the distensibility of the dog or sheep thoracic aorta, and to have little or no effect in the less distensible vessels such as the dog femoral artery. These non-linear terms are also shown to be important in the case of an initially tapered vessel.
19 citations
TL;DR: A pharyngeal rhabdomyosarcoma was found in a 6-year-old dog, which caused an altered bark and subsequent progressive dyspnea.
Abstract: A pharyngeal rhabdomyosarcoma was found in a 6-year-old dog. The neoplasm caused an altered bark and subsequent progressive dyspnea. In man, rhabdomyosarcomas have predilection for the pharynx.
16 citations
16 citations
TL;DR: Venom extracted from anterior regions of the venom ducts of Conus arenatus, Conus lividus, and Conus quercinus displayed significant proteolytic activity towards casein with optimal activities between pH 9 and 10, and in contrast no caseinase activity was displayed by venoms extracted from the posterior regions.
TL;DR: In this article, a general formulation of the rate of growth of a tumor is given in terms of transport and accumulation of neoplastic cells in regions surrounding the initial site of a cancer.
Abstract: A general formulation of the rate of growth of a tumor is given in terms of transport and accumulation of neoplastic cells in regions surrounding the initial site of a cancer. A simplification of the problem is then given, followed by an explanation of the several processes involved. The special case of a spherical tumor is described and some implications of the field-theoretic approach for tumor therapy are outlined.
TL;DR: In this paper, a reduction in particle size of matrix material (aluminium powder) with a limited increase in the oxide content was obtained by ball-milling in a controlled oxidizing atmosphere.
TL;DR: The deployment of veterinary services for disease control and animal production is outlined, particularly in the fields of extension work and research, and recommendations are made on methods of applying technical aid programmes with special reference to the role of Australia in the Indo-Pacific area.
Abstract: The contribution of veterinary science to food production and human health in the tropics is analysed. The basic difficulties arising from the environments, animal husbandry methods and sociological patterns are emphasised. The deployment of veterinary services for disease control and animal production is outlined, particularly in the fields of extension work and research. Recommendations are made on methods of applying technical aid programmes with special reference to the role of Australia in the Indo-Pacific area.
01 Oct 1971
TL;DR: In this article, a 3D Fourier synthesis of a 2,9-dimethyl-1,10-phenanthroline)-palladium (II) was performed in the orthorhombic system, space group P21nb, with cell dimensionsa = 6·790,b = 19·807,c = 10·625 A andZ = 4.
Abstract: Dinitro(2,9-dimethyl-1,10-phenanthroline)-palladium(II) crystallizes in the orthorhombic system, space groupP21nb, with cell dimensionsa = 6·790,b = 19·807,c = 10·625 A andZ = 4. The structure was determined from three-dimensional Fourier syntheses and refined by full-matrix least squares, the finalR for 1155 measured reflexions being 0·07.
TL;DR: Of various additives tested as carriers, carbon and MoO(3) were found to be best and compared well with those obtained by wet-analysis.