If the first dose of a tetanus toxoid-containing vaccine is administered before the first birthday, 4 doses are necessary before beginning the 10-year cycle of booster doses. If the first dose is administered after the first birthday, 3 doses are necessary.
Teacher-Authored Instructional Unit Samples. The content specialists in the Standards and Instructional Support office have been working with educators across the state to create instructional units based on the published curriculum overview samples.
1 unit (U) is the amount of enzyme that catalyses the reaction of 1 nmol of substrate per. minute (definition B) While the definitions may vary the user can still make valid product comparisons as long as. suppliers are explicit about their unit definitions and the assay conditions employed.