Leg pain is also frequently a sign of injury, such as the following: Muscle strain is a common injury that happens when the muscle fibers tear as a result of overstretching. It often occurs in the larger muscles, such as the hamstrings, calves, or quadriceps.
medical Definition of superinfection : a second infection superimposed on an earlier one especially by a different microbial agent of exogenous or endogenous origin that is resistant to the treatment used against the first infection
1 Centrifugation of the human OC mixture is performed to produce the supernatant. The extent of biocorrosion is then quantified by measuring the concentration of the metal ions released into the supernatant.  Purification of water to remove copper in the water generated by the PCB processes in the electronics industry.