Table 1.
Exponential decay distribution of penton release
| Specimen | Penton release constant λ (images−1) | Mean penton lifetime 1/λ (images) | N |
| Ad5-VII- | 0.08 | 12 | 9 |
| Ad5-wt | 0.04 | 26 | 7 |
The penton distribution data follow an exponential decay function N(t) = N0e−λt, where t is the number of images taken, and parameters such as the penton release rate constant (λ) and mean life-time of a penton (1/λ) can be determined. The mean penton lifetime is given as number of images; the penton release rate constant represents the probability to release one penton in one image.