Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.456470
Title: Lead uptake and its effects upon moss metabolism
Author: Ghaemian, Nahid
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1979
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Abstract:
The consequence of lead pollution on the metabolism of a number of moss species which had been characterized as "sensitive" to pollutants according to Black (1974) were investigated by laboratory experiments. The effects of lead pollution on the moss membrane system, on their growth, on their physiology and in particular, on their respiration, photosynthesis and photosynthetic pigments were demonstrated. An investigation was undertaken to compare lead mines (Lead Hills and Strontian - Scotland), with that of the area surrounding, but just off the strontian mine and with the lead accumulation in moss adjacent to some main thoroughfares. A two-part study to ascertain the physiological effects of experimentally induced lead pollution on uncontaminated moss samples ensued. In the first experimental section, treatments involving different concentrations of lead were carried out for a short duration (a few days) by using a percolation system In the second section, experimental samples were cultured onto lead media for a long-term exposure. The results from both experiments showed the physiological response of the mosses to lead uptake; these included low photosynthetic rates, high rates of respiration and converted chlorophyll pigment to phaeo phytin pigment. The uptake of lead in the experimental samples being percolated in lead solution was much higher than the lead uptake of the samples cultured on Pb enriched media. In accordance with these results, it was suggested that the rhizoid might take up lead more than the stem and perhaps there is a barrier between them which stops lead going throughout the stem. A further experiment was carried out to test the validity of this suggestion. Again utilizing moss samples collected from lead mines and busy roads, the results substantiated the above suggestion. The investigation involving lead pollution along main roads, both inside and outside of the city showed that the lead uptake ratio of rhizoid to stem was not the same as that of the mosses from lead mines. This could be attributed to atmospheric pollution which comes from auto-exhaust fumes.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.456470  DOI: Not available
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