136 страниц. 2012 год. LAP Lambert Academic Publishing Trace elements are elements that occur in human & animal tissues in milligram per kilogram amounts or less. Although trace elements are only required in small amounts, is less than 100mg per day, they are vitally important. Deficiency can lead to serious disorders. Several trace elements are essential micronutrients and are required for various body functions and well being of the immune system. Various types of trace elements and their applications are discussed.