Showing papers by "Daniel I. Arnon published in 1955"
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TL;DR: "Experimcntcrs never acccpt an immutablc starting point; their principle is a postulatc, all of whose consequenccs they logically deducc, but without ever considering it absolute or beyond thc rcach of experiment."
Abstract: \"Experimcntcrs . . . never acccpt an immutablc starting point; their principle is a postulatc, all of whose consequenccs they logically deducc, but without ever considering it absolute or beyond thc rcach of experiment. All the theories which serve as starting points for . . . physiologists are true only until facts are discovered which thcy do not include or which contradict thcm. ll'hen these contradictory facts are shown to be firmly establishcd . . . experimenters, far from stiffening themselves against new evidence, hasten . . . to modify their theory, because they know that this is the only way to go forward and to make progress in scicnce. Expcrimenters, then, always doubt, evcn thcir starting point.\"-Claudc Rcrnard, Introduction a ?Etude dc la Midicine Expe'rinzcntale ( 1865).
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TL;DR: In the life cycle of the plant from seed to seed, the GPD changes cyclically from obligate DPN dependence in the seed, to a multicomponent system in the shoot, functional with either DPN or TPN, and back to obligates DPN dependent in the newly formed seed.
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TL;DR: Triosephosphate dehydrogenase was isolated from an acetone powder prepared from pea seeds by the following steps: a moderate heat treatment, two ammonium sulfate fractionations, and a dilution treatment.