Fig. 3From: An Automated Perifusion System for Modifying Cell Culture Conditions over TimeAbsorbance readings from the trypan blue (2 min on:3 min off) test. The syringe pump alternated between pumping 2 min of trypan blue then 3 min of water for the entirety of the experiment. The y-axis is labeled as the arbitrary unit optical density, which is a measurement of absorption at 595 nm wavelengthBack to article page