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In addition , special attention must be paid to the security of the high level zones , particularly the root zone . In addition , policy guidance calls on agencies to analyze alternative actions , such as the use of frequent traveler programs , and to examine expected benefits , such as the expected reduction in lives lost , property damage , and disruptions to the economy as a result of reducing the likelihood of a terrorist attack . In addition , Dietary Reference Intakes : The Essential Reference for Dietary Planning and Assessment provides information about : Guiding principles for nutrition labeling and fortification Applications in dietary planning Proposed definition of dietary fiber A risk assessment model for establishing upper intake levels for nutrients Proposed definition and plan for review of dietary antioxidants and related compounds Dietitians , community nutritionists , nutrition educators , nutritionists working in government agencies , and nutrition students at the postsecondary level , as well as other health professionals , will find Dietary Reference Intakes : The Essential Reference for Dietary Planning and Assessment an invaluable resource . In addition , basic articles describing the properties of a variety of natural and artificial light sources are included . In addition , scientists are also determining how genetic errors can be corrected in the patient 's genome , by replacing the faulty copy with a correctly functioning one - in a process known as gene therapy .