All other polonium isotopes are short-lived except polonium-210 (half-life about 138 days), which is the most commonly used isotope. It is prepared by bombarding bismuth with neutrons in a nuclear reactor.olonium has 34 isotopes, more than any other element. All of these isotopes are radioactive. The most stable, polonium-209, has a half-life of about 103 years. Polonium-208 (half-life about 3 years) is the only other polonium isotope with a half-life over one year.
Ashkenazi Jewish genetic diseases are a group of rare disorders that occur more often in people of Eastern European (Ashkenazi) Jewish heritage than in the general population.
Leigh's Disease Definition. Leigh's disease: A rare genetic disorder characterized by progressive damage to the central nervous system. Leigh's disease is caused by a defect in the function of mitochondria within the cells of the body.Symptoms begin in infancy and include poor sucking ability, the loss of head control and motor skills, loss of appetite, vomiting, irritability, continuous crying, and seizures.eigh's Disease Definition. Leigh's disease: A rare genetic disorder characterized by progressive damage to the central nervous system. Leigh's disease is caused by a defect in the function of mitochondria within the cells of the body.