The control of apoptosis and drug resistance in ovarian cancer: influence of p53 and Bcl-2.

A directional tap for tapping electronic signals from a distribution line is shown herein. The tap includes a directional coupler having a current sensing transformer and a voltage sensing transformer. The current sensing transformer has a primary winding connected in series with the distribution line, and the voltage sensing transformer has a primary winding connected in shunt to the distribution line. The secondary windings of the two sensing transformers are connected in parallel with each other. The current sensing transformer has a turns ratio of AND THE VOLTAGE TRANSFORMER HAS A TURNS RATIO OF IN WHICH N is a variable representing the number of selected windings and r is the ratio Z/z in which Z IS THE CHARACTERISTIC IMPEDANCE OF THE DISTRIBUTION LINE, Z is the selected output impedance of the coupler, and Z is not equal to z.