A method and apparatus for arbitrating on a high performance serial bus is disclosed. The method involves mixing of test plasma from a human to be tested with specially prepared plasma deficient in both and only coagulation factors II and X but with normal levels of other factors, in order to correct for any possible deficiency in other coagulation factors than FII and FX in the test sample. In one embodiment, a heatsink of the lighting fixture is configured to receive the sensor module. A control interface is outside the virtual private servers and can be used for control of the virtual private servers in response to control commands. Compared to the herbicides used on their own, these compositions have superior activity and at the same time high compatibility with crop plants.