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.
While there are many causes of radiation pollution (including research and medical procedures and wastes, nuclear power plants, TVs, computers, radio waves, cell-phones, etc.), the most common ones that can pose moderate to serious health risks include: Defense weapon production â may also release radioactivity from the handled radioactive materials (usually of high health risks). 2  However, unless accident occurs, the current standards will not allow the release of any significant amount of radiation.