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.
Typical emission spectra of collagen gel sample at various excitation wavelengths obtained in microspectroscopy. (a) Spectra are normalized to the maximum 2PEF emission of the most intense spectrum (here at 750 nm excitation wavelength), (b) spectra are normalized with respect to 450 nm.
