In fact, it has been found that PEGylated CNTs can persistently exist within liver and spleen macrophages for 4 months with excellent compatibility [53].
Why do they persistently exist?
Although Williams and Turnbough suggested EA1 was not a true spore surface protein, they stated this protein persistently existed in the spore surface [28].
Whichever is correct, it does not matter for the detection of B. anthracis spores, because this protein does persistently exist in each of the spore preparations (Fig. 8), and the B. anthracis spores, even after full washing, can be detected with our anti-EA1 mAbs (Fig. 2 and Fig. 7).
But, when ac > bd, the population exists persistently and is harmful after reaching high density.
Then, Theorem 1 tells us that if R0 ≤ 1 then the population dies out; otherwise, (1) possesses a globally asymptotically stable positive equilibrium and hence the population exists persistently.
Others keep insisting that we continue to prepare to face down a cold war threat that no longer exists and persistently ignore the world as it is.
When subcutaneously and abdomenally administered, a part of CNTs exist persistently in the local tissues while some of them may be absorbed through lymphatic canal.
