ANTIBIOTIC SUSCEPTIBILITY TESTING. Bacteria demonstrate two kinds of resistance to antibiotics, namely intrinsic resistance and acquired resistance. Intrinsic resistance means that the species was resistant to an antibiotic even before its introduction.
Radioactive contamination and radiation exposure could occur if radioactive materials are released into the environment as the result of an accident, an event in nature, or an act of terrorism. Such a release could expose people and contaminate their surroundings and personal property.
Quick Answer. Most chlorofluorocarbons are released into the atmosphere through leakages from refrigerants and the use of aerosols. They have no notable natural sources. Chlorofluorocarbons are chemical compounds composed of carbon, fluorine and chlorine. Continue Reading.