Biochemical tests and use of media allow physicians to identify
the type of bacteria causing a disease (such
as whether its gram+ or gram-) and use appropriate
antibiotic effective against the bacteria. Another clinical significance is to
determine the resistance of bacteria to antibiotics (this is conducted using susceptibility tests).
One half-life after a radioactive isotope is incorporated into a rock there will be only half of the original radioactive parent atoms remaining and an equal number of daughter atoms will have been produced.
