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.
Radiation is naturally present in our environment, as it has been since before the birth of this planet. In addition, radiation can be produced artificially, as in medical x-rays and microwaves for cooking. Nonetheless, most people are not aware of all the natural and man-made sources of radiation in our environment.
Four things can happen when radiation enters a cell: 1. The radiation may pass through without any damage occurring; 2. The radiation may damage the cell, but the cell repairs the damage; 3. The radiation may damage the cellâ¦the damage is not repairedâ¦and the cell. replicates itself in the damaged form; 4. The cell dies.