Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic illustration of the principle of flow cytometry for sizing DNA. The sheath flow focuses the sample stream as it flows towards the laser excitation. Dashed lines demarcating the boundary between fluid elements in the sheath flow and the sample flow are included to illustrate the flow focusing concept. The laser induced fluorescence detection is normally performed at a 90° angle with respect to the excitation.
