Cause of the Hum. In the U.S. electrical transformers the hum that occurs happens at a frequency of 120 Hz. When vibrations reach this level of repetition, the metal used to construct the transformer internal core begins to give off a noise. The vibration, or hum, is a reaction by the transformer metal to the presence of a magnetic field created as electricity passes through. This process is called magnetostriction.
A high-sensitivity CRP (hs-CRP) test measures low levels of CRP using laser nephelometry. The test gives results in 25 minutes with a sensitivity down to 0.04 mg/L.RP is synthesized by the liver in response to factors released by macrophages and fat cells (adipocytes). It is a member of the pentraxin family of proteins. It is not related to C-peptide (insulin) or protein C (blood coagulation).
However, the high sensitivity CRP (hs-CRP) test measures very small amounts of CRP in the blood and is ordered most frequently for seemingly healthy people to assess their potential risk for heart problems. It typically measures CRP in the range from 0.5 to 10 mg/L. The regular CRP test is ordered for those at risk for infections or chronic inflammatory diseases (see above). It measures CRP in the range from 10 to 1000 mg/L.