1.   At low pressures, a plasma is established with a discharge of positive ions travelling towards the cathode.

2.   If the ion channel lets positive ions into the receiving neuron, the neuron is pushed toward firing.

3.   Negative ions pass through a membrane containing positive ions more easily than through one that is neutral or negatively charged.

4.   These channels let in a flood of even more positive ions, which obliterates the electrical charge at that spot.

5.   When glutamate is released into a synapse, it docks at a receptor that lets positive ions rush in.

6.   The positive ions are accelerated to a narrow beam by the use of negative plates and a high voltage.

7.   Plasma consists of positive ions and unbound electrons.

8.   The clay is highly selective, swapping out positive ions for radium ions.