An externally applied ultrasound transducer converts sound energy into electrical energy which is recorded on a graph. The maternal uterine contractions also are recorded on the graph so that they can be related to the fetal heart rate, to indicate fetal distress. Extent of migration and separation of components depends on molecular weight and electrical charge of the particles. This method often is used to determine the proportions of various proteins in serum. A protein produced by cells that influences the speed of a specific chemical reaction without being used up or permanently changed in the process.
Enzymes are catalysts.
An assay that uses an enzyme-bound antibody to detect antigen. The enzyme catalyzes a color reaction when exposed to substrate. Similar to EIA except the enzyme catalyzes a fluorescence, not a color reaction. A female sex hormone. Blood levels of ethanol can be ascertained by tests that indicate the degree of intoxication.