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Free coagulase is an extracellular toxin that reacts with a thrombin-like, thermostable substance known as coagulase-reacting factor (CRF) or serum factor. The reaction of coagulase and CRF will lead to the formation of coagulase-CRF complex where this complex indirectly changes frbrinogen to fibrin (clotting factor) and hence will form a fibrin clot. Furthermore, it is also use as the primary indicator of virulence among staphylococci. Its clinical significance is that when doing the coagulase tube test, the free coagulase will react with the plasma in the tube and hence convert the fribrinogen into fibrin which lead to fibrin clot formation in the tube. This is shown after one day of incubation of the tube, when the tube being invert, the plasma will not go down showing that it is clotted.
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.