Countries with colonial ties, such as France, Portugal, Spain, Italy and the UK are prone to offer this kind of assistance; though, its main goal is to reinforce political alliances or to increase spheres of influence.
Furthermore, the recovery of the activity concentrations within the physical boundaries of the spheres increased with increasing sphere volume.
The debonding stresses increased with decreasing sphere diameter, whereas the length to diameter ratio of the resulting matrix cracks increased with increasing sphere diameter.
Increasing the height of fall (or impact velocity) has a similar, but surprisingly weaker, effect to that of increasing sphere diameter.
Sphere clusters were located in both arterioles and small arteries and increased in size with increasing sphere concentration, resulting in increased absorbed dose inhomogeneity, which contradicts earlier modelling studies.
Willowson et al. showed a phantom sphere of 90Y radioconcentration 3.9 MBq/ml and diameter 37 mm to have a recovery coefficient of approximately 0.8, and a trend was observed for recovery coefficients to approach 1 with increasing sphere size [33].
At a plating density of 1.5 cells/µl, CD133 expressing cells exhibited increased sphere formation (Fig. 6A).
LA-N-5 spheres were further studied and showed a verapamil-sensitive side population, relative resistance to doxorubicin, and CD133+ cells showed increased sphere formation and tumorigenicity.
Free-floating sphere formation is common for NSCs and CSCs, and we often see increased sphere formation in arsenic-induced CSCs.
