What type of light is used to observe the pellet after centrifugation?

To observe the pellet after centrifugation, UV light is utilized because green fluorescent protein (GFP) has unique fluorescent properties that are activated under ultraviolet radiation. When excited by UV light, GFP emits a bright green fluorescence, making it possible to visualize the protein even at low concentrations. This specific fluorescence allows researchers to confirm the presence of GFP in the pellet, aiding in the assessment of the purification process. The importance of using UV light lies in its ability to excite the fluorophore, enabling optimal observation of the proteins purified from their surrounding components.