The deuterium injector, or simply matter injector, is a component of starship's warp core, which precisely compresses and streams matter (deuterium) into the form which enters the dilithium articulation frame.
In 2372 in the mirror universe, Benjamin Sisko took the Defiant's deuterium injector offline and online again. It required the flow regulators to be shut off. (DS9: "Shattered Mirror")
The Red Squad cadets often had trouble with the USS Valiant's deuterium injector startup routine, as the system often experienced power spikes. When he came aboard, Nog suggested doing what Chief O'Brien had done on the USS Defiant, by recalibrating the lateral impulse control system. (DS9: "Valiant")
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