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.
BRAIN: Nerve cells (neurons) and brain blood vessels can die, leading to seizures. EYES: Radiation exposure increases the risk of cataracts. THYROID: When a nuclear reactor malfunctions, radioactive iodine (I-131) can be released into the atmosphere (this is one of the particles that hangs out in a radioactive plume).