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.
4) The process in which the nuclei of unstable atoms can become more stable by emitting particles and/or electromagnetic radiation is called ________________. 5) High-energy electromagnetic radiation released by a radioactive nucleus are called __________.) A positively charged particle made up of two protons and two neutrons and released by a radioactive nucleus is the __________. 2) An electron released by a radioactive nucleus that causes a neutron to change into a proton is called a __________.