Title: Zinc-65 uptake in a two-step marine food chain
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Permanent Link: http://ufdc.ufl.edu/UF00097909/00001
 Material Information
Title: Zinc-65 uptake in a two-step marine food chain
Alternate Title: Zinc-sixty-five uptake in a two-step marine chain
Physical Description: xii, 162 leaves. : illus. ; 28 cm.
Language: English
Creator: Regnier, John Edward, 1934- ( Dissertant )
Putnam, H. D. ( Thesis advisor )
Lackey, J. B. ( Reviewer )
Black, A. P. ( Reviewer )
Martin, R. ( Degree grantor )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1965
Copyright Date: 1965
 Subjects
Subjects / Keywords: Seawater   ( lcsh )
Marine biology   ( lcsh )
Civil Engineering thesis Ph. D   ( local )
Isotopes -- Physiological effect   ( lcsh )
Zinc -- Physiological effect   ( lcsh )
Zinc -- Isotopes -- Physiological effect   ( lcsh )
Dissertations, Academic -- Civil Engineering -- UF   ( local )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Abstract: A laboratory food chain study was conducted to measure the values of the parameters used to calculate the Maximum Permissible Concentration of zinc-65 in sea water. The food chain consisted of two microscopic marine algae, Nitzschia closterium and Carteria sp. , and the bottom feeding fish, mullet (genus Mugil ) . The parameters evaluated were the rates of biological elimination of zinc by mullet, and the maximum concentrations of zinc-65 accumulated by the algae and mullet as a result of chronic exposure to this nuclide. The algae concentration factors (uc per gm algae/uc per ml culture medium) were slightly greater for Carteria sp. than for Nitzschia closterium . The respective average values being 15,900 and 13,200. However, results indicated that the magnitude of these factors was limited by available zinc-65 rather than species characteristics. Mullet uptake of zinc-65 from the algae was describable by a mathematical model, and the apparent maximum concentrations were reached in 55 to 60 days. These maximums decreased in magnitude as mullet size increased. For comparable size fish, the maximum mullet concentration factors relative to the algae culture medium were 230 for Carteria -f ed fish compared to 135 for those fed Nitzschia cells. The magnitude of these factors indicates discrimination rather than concentration of zinc-65 by the mullet compared to the algae zinc-65 concentration. Differences in maximum uptakes of zinc-65 from the two algae were significant, but these differences were attributed to variation in zinc-65 and total zinc concentrations in the fish food rather than to differences in the mode of uptake from the two species of algae. Biological half-lives, which define elimination rates and affect maximum uptake values, varied from 33 days to 99 days depending on the method of measurement. Mullet were found to have value as indicators of zinc-65 contamination of marine environments, and efficient monitoring programs could be designed on the basis of this property. The Maximum Permissible Concentration of zinc-65 in sea water based on the results of this study would be approximately five times greater than the current recommended value of 7 x 10" 9 uc/ml . However, similar evaluations of additional marine food chains are necessary before recommendations are made to raise the existing value.
Thesis: Thesis -- University of Florida.
Bibliography: Bibliography: leaves 156-161.
Additional Physical Form: Also available on World Wide Web
General Note: Manuscript copy.
General Note: Vita.
 Record Information
Bibliographic ID: UF00097909
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000549731
oclc - 13286316
notis - ACX4028

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