(thÃ»r'mÄ«'Én) An electrically charged particle or ion that is emitted by a heated conducting material. The electrons emitted from the cathodes of electron tubes (such as cathode ray tubes) are thermions.
A low white blood cell count (leukopenia) is a decrease in disease-fighting cells (leukocytes) in your blood. Leukopenia is almost always related to a decrease in a certain type of white blood cell (neutrophil). The definition of low white blood cell count varies from one medical practice to another. In general, for adults a count lower than 4,000 white blood cells per microliter of blood is considered a low white blood cell count. For children, that threshold varies with age.
Things you can do to reduce your risk of infection when you have low white blood count: 1  Frequent hand washing of both you and those coming in contact with you. 2  Avoid contact with anyone who is sick. 3  Do not have dental work done while your white blood cell count is low.OW WHITE BLOOD CELL COUNT (low WBC). Leukopenia-A decrease in the total number of white blood cells, which may lead to low white blood cell count. Neutropenia-A decrease in the number of neutrophils, which may lead to low white blood count.