Both team's telescopes were equipped with special filters, which could distinguish extremely rapidly between photons that were more red or more blue than a particular reference wavelength.
A reference wavelength at 630 nm was used.
The plates were immediately read at 570 nm with 620 nm as reference wavelength.
Data represent mean absorbance at a wavelength of 450 nm (reference wavelength, 655 nm).
The absorbance was measured at 450 nm with a reference wavelength of 600 nm.
The protocol collected data at 540 nm (maximum absorption wavelength) and 700 nm (reference wavelength).
The reference wavelength was 650 nm.
Optical density was read immediately at 570 nm with a reference wavelength at 630 nm [20].
Absorbance was measured at 560 nm and reference wavelength at 750 nm was subtracted.
BrdU incorporation was measured as absorbance at 405 nm with a reference wavelength at 490 nm.
All absorbance measurements were corrected to the reference wavelength (Corrected absorbance = 570 650 nm).
