This test allows the simultaneous high-sensitivity determination of serum estrone and estradiol levels. It is useful in situations requiring either higher sensitivity estradiol measurement, or estrone measurement, or both. This includes the following:
The Tunnel is coming back for a second thrilling series, and there are some new faces joining the cast. Silent Witness star Emilia Fox, The Wire actor Clarke Peters and Shameless's William Ash will appear in Sky Atlantic's follow-up The Tunnel: Sabotage in the spring.
A tunnel diode is a two-terminal device with an n-type semiconductor acting as cathode and a p-type semiconductor acting as anode. It is heavily doped, which in turn creates a narrow depletion zone like a Zener diode. The current-voltage characteristic of a tunnel diode has a strong non-linear nature, as well as a negative differential resistance region. Two distinct advantages of tunnel diodes are longevity and very high speed.