Blinking has been a problem for researchers, because it breaks up the trajectory of a moving particle or tagged molecule that they are trying to follow.
But because the particles glow continuously, researchers can use them to track tagged molecules continuously.
Lynn, surveyed tissue using tagged molecules
known to link with these receptors.
As urine flows through the cylinder, any cocaine molecules in the sample will kick their fluorescent counterparts off the the antibodies, and these tagged molecules
will register a positive result as they exit past a fluorimeter.