Related Terms. Long-term (maturity over 10 years) fixed interest rate debt security issued by a national (federal) government backed by its 'full faith and credit.' Next to treasury bills (maturity less than one year), and treasury notes (maturity one to ten years) T-bonds are the safest form of marketable investment.
bacteria [pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles. Once considered a part of the plant kingdom, bacteria were eventually placed in a separate kingdom, Monera.
3 2. To illustrate the characteristics features of microorganisms and the diseases they cause. 3. To explore mechanisms by which microorganisms cause disease. 4. To show how the human immune system counteracts infection by specific and non-specific mechanisms. 5. To explore the routes of transmission of infection in hospitals, communities and populations and the methods used to control the spread of infection.