FIG. 4.

(A) Osteogenic tissue graft in a 1.5 mL Eppendorf tube with medium, (B) pO₂ map of sample with medium after the tube was partially sealed. (C) pO₂ map after ∼2 h after first measurement, pO₂ gradient is visible in the sample as well as in the tube as cells are consuming available oxygen, (D) pO₂ dynamics for voxels inside the sample (denoted by a blue circle in C) and adjacent medium (denoted by a red star in C) as a function of time. The measurement was done with the closed tube for 7 h and then another 1 h after opening the tube. Color images available online at www.liebertpub.com/tec