Uranium ore is rock containing uranium mineralisation in concentrations that can be mined economically.
He said that the combined levels were low, and that uranium-233, if present in the lab's sample, was in concentrations that were not a health concern.
It is still not known whether the element, which has a half-life of 24,100 years, can move in ground water over distances of several miles in concentrations that would be harmful.
A wide range of pollutants reach the soils of natural and managed ecosystems in concentrations that can affect their function.
Both tetragonal and monoclinic nanocrystalline phases had atomic defects in concentrations that depended on the synthesis method and annealing temperature.
But as illegal fentanyl poured into North America in concentrations that varied widely from dealer to dealer, harm-reduction groups began offering them in 2016 to test for fentanyl in heroin and other drugs.
The vague language of the latter had provided large corporations with numerous loopholes, enabling them to engage in certain restrictive business arrangements that, though not illegal per se, resulted in concentrations that had an adverse effect on competition.
The low soil pH might have facilitated the bioavailability of the heavy metals resulting in concentrations that could be harmful to consumers of these vegetables.
The homocysteine hypothesis states that circulating homocysteine is a vascular toxin in concentrations that occur in the general population and in renal failure.
For instance, the blood can contain thousands of proteins in concentrations that fluctuate widely, even within a day, in response to such activities as running or sleeping.
