Some radioactive iodide salts of sodium, including [ 125I ]NaI and [ 131I ]NaI, have radiopharmaceutical uses, such as in the treatment of thyroid cancer and hyperthyroidism or as radiolabeling tracers in imaging (see).
Genetic drift is defined as the changing of the number of available alleles in a population by chance events. Also called allelic drift, this phenomenon is usually due to a very small gene pool or population size.
Pronator drift is an indication of a subtle upper motor neuron disorder, although it can be present in other conditions, such as inborn errors of metabolism. During a pronator-drift test, a patient is asked to hold his or her arms outstretched with palms facing upward.