These agents were called "cathode rays".
Alkaline zinc - air batteries internal hollow cathode version
Released by activated macrophage and natural killer cells, it is a potent immuno - modulator which mediates a wide range of immune and inflammatory responses including the activation of b and t cells
The hydrogen in the gauge is ionized by electron emission from a heated cathode.
In discussing cells, one calls the electrode at which reductions occur the cathode.