Biographical Memoirs Volume 71 (1997) / Chapter Skim
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JOHN MICHAEL DALY
JOHN MICHAEL DALY
Pages 33-48
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the devastating southern corn leaf blight epiphytotic of 1970 and participated to varying degrees in studies of other similar toxins.
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He served on the Catholic Social Service Board and was involves! in eclucational efforts to promote awareness of the sanctity of life.
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a fervent fan of the Celtics basketball team en c! of Notre Dame football.
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To clo so, he left the plant pathology department for the botany department at the University of Minnesota, but he clic! not leave his interest in plant diseases.
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him a position in the plant pathology department at the University of Nebraska with freedom to start his own research program. Daly acceptec!
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energy from host plants. The contribution of the rust fungus to the host plant is less clear, although the formation of pustules containing spores is an obvious morphological disruption of plant tissue.
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with many approaches inhibitors, labelec! precursors, kinetic studies, anaerobic versus aerobic conditions, en c!
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In postulating reasons for the difference between resistant and susceptible cultivars, most plant pathologists consider susceptibility the norm and resistance to be an active mechanism induced by the presence of the pathogen. However, most fungi do not cause disease in most plants.
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As a preliminary step to purification of the toxin, Daly sought a better bioassay than root growth inhibition. The toxin inhibiter!
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corn as the natural toxin, that is, they were toxic to T-cytoplasm corn but not to N-cytoplasm corn. The C24 synthetic analog with four intervening methyIenes was slightly less toxic than the C25 analog, but the C26 analog with six intervening methylene groups was less than one-tenth as toxic as the C25 analog, showing the importance of the length of the intervening methyTene groups between the clusters of oxy/oxo groups.
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CONCLUSION One of Daly's lasting contributions was the rigorous standards he brought to physiological investigations of plant disease. Physiology of pathogenesis was emerging when Daly became active, en c!
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G Boosalis provided personal and professional information on Mike.
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Livne. Carbohydrate metabolism in higher plant tissues infected with obligate parasites.
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Inhibition of dark CO2 fixation and photosynthesis in leaf discs of corn susceptible to the host-specific toxin produced by Helminthosporium maydis, race T Plant Physiol.
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Structure and biological activity of a host-specific toxin produced by the fungal corn pathogen Phyllosticta maydis. Biochemistry 23: 759-66.
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