Influence of changing g-forces during parabolic flight on the ROS production visualized by luminol kinetics in the PMT clinostat (non-rotating). Cells were activated by opsonized zymosan stimulation before the first parabola. Luminescence was measured in counts per second (CPS). A. Detailed ROS production during parabolas 6–10 (blue) is shown in correspondence to g-profile (grey, kindly provided by Novespace). B. Detailed ROS production in response to altered gravity during parabola 6.