1. The AEBB-2000 accelerator is a unique facility for carrying out experiments with anti-parallel electron-positron beams of high energies.

2. In contrast to DNA, PNA can bind in either parallel or anti-parallel fashion.

3. A secondary structure in proteins, relatively flat and formed hydrogen bonding between two parallel or anti-parallel stretches of polypeptide.

4. A general approach to analysis of class E tuned power amplifier with anti-parallel diode at switch is presented.

5. For each of the first and second switches, an associated anti-parallel diode is configured to provide an electrical path when the switch associated with the diode is inactive.