DISTRIBUTION OF AND DISCRIMINATION AGAINST NATURALLY OCCURRING 226Ra IN SWINE

Nelson, N.S.; Rust, John H.

doi:10.1016/b978-0-08-012122-2.50069-4

Cited by 4 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When enzyme or transport systems control element movement, ionic and hydrated or effective radii differences become important (Passow et al, 1961;NRC, 1972). When movement depends upon solubility, solubility constants are of obvious importance (Nelson and Rust, 1966). Because of the above considerations, the following parameters for calcium, strontium, barium, and lead were used to measure the degree of similarity between the elements.…”

Section: Resultsmentioning

confidence: 99%

Concentrations and Discrimination of Chemically Related Metals in a Food Chain

Lemons

Kennington

1983

Chemistry and Ecology

View full text Add to dashboard Cite

Concentrations of the related elements calcium, strontium, barium, and lead were determined in soil extract, consumer stomach contents, and consumers in lead polluted and unpolluted areas. Discrimination against the nonessential metals relative to the nutritious metal calcium, as the metals were transferred through a trophic pathway was determined. Discrimination of metals varied systematically as a function of degree of nonessential element similarity to calcium. The existence of systematic trends of discrimination may facilitate the assessment of natural levels of some toxic elements (e.g. lead) in organisms.

show abstract

Section: Resultsmentioning

confidence: 99%

Concentrations and Discrimination of Chemically Related Metals in a Food Chain

Lemons

Kennington

1983

Chemistry and Ecology

View full text Add to dashboard Cite

show abstract

“…There is some question as to the retention of barium, which shows a slight curvature in the power function reported by man. (40,49) used. (58,65) retention data of radiostrontiun administered parenterally to several animal species.…”

Section: Radiostrontium and Radium (Alkaline Earth Metals)mentioning

confidence: 99%

Comparative Metabolism of Radionuclides in Mammals

Stara¹,

Nelson²,

Rosa³

et al. 1971

Health Physics

View full text Add to dashboard Cite

An extensive review of animal and human metabolism data for selected radionuclides is presented in an attempt to assess the value of animal research and subsequent extrapolation of the results to man. Since isotopes of related elements generally follow similar metabolic pathways, radionuclides of biological importance were selected and grouped by their respective chemical families. Criteria for selection included world-wide atmospheric contamination, general use in medicine and industry, contribution to the natural radiation environment and their radiotoxicity. In this review, reported results, supplemented by original work, were compiled for the following radionuclides: 13'Cs for the alkali metals; 9OSr and zzaRa for the alkaline earths;z3ePu for the lanthanides and actinides; lS1I for the halides; 210Po and aloPb for the transitional elements; and lo6Ru for the transition metals. An appraisal of biological effects and of therapeutic or preventive methods for each radionuclide is also given.Comparative studies of hazardous radionuclides in animals are necessary since they provide basic data useful for assessment of their metabolic pathways and response in man. Animal data are especially valid when values are obtained for several species from different mammalian sub-families with life spans ofdifferent duration. In certain cases, however, the data suggest species specific metabolic pathways for individual isotopes. The authors conclude that extrapolation to man from animal data is admittedly difficult and sometimes inaccurate; however, the risks in not extrapolating are unquestionably greater.

show abstract