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Induction of change in the fungus chaetomium by irradiation with monochromatic ultra-violet and the mechanism of the reaction

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Plomley, NJB (1946) Induction of change in the fungus chaetomium by irradiation with monochromatic ultra-violet and the mechanism of the reaction. Unspecified thesis, University of Tasmania.

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Abstract

1. Change induced in the fungus Chaetomium by irradiation of the
spore with monochromatic ultra-violet has been investigated from a
quantitative viewpoint.
2. The methods used in irradiation and growth of the material and
the measurement of irradiation dose are described. Samples of spores
were irradiated monochromatically at 265, 313 and 334 mu. Colonies
of single spore origin were obtained by single-spore and dilution
plating and each grown in single petrie dishes.
3. Variation was induced by irradiation in the short, middle and
long ultra-violet, and included genetic effects, lethal effects and
"growth-damage. The nature of variation is discussed.
4. The relative quantities of the genetic effects and "growth damage"
differed at each wavelength, the short ultra-violet being
much more effective in inducing "growth-damage' than genetic effects,
and the long wavelengths less effective. The lethal effects are
shown to involve genetic change.
5. Evidence is presented associating the genetic effects with
qualitative gene change, which is considered to involve reaction
by the protein component of nucleoprotein.
b. "Growth-damage" is considered to involve an effect upon nucleic
acid whereby the normal functioning of the nucleus is prevented,
resulting in aberrant cell growth.
7. Nucleoprotein is visualised as providing the mechanism of
heredity, the protein component being concerned with qualitative
gene action and nucleic acid with the reproduction of the genetic
protein, protein and nucleic acid react independently.

Item Type: Thesis (Unspecified)
Keywords: Fungi, Mutation (Biology)
Copyright Information:

Copyright 1947 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (MSc)--University of Tasmania, 1947

Date Deposited: 03 Feb 2015 03:12
Last Modified: 19 Oct 2016 01:05
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