In contrast, S BET requires only a single measurement on an aliquot of the administered particles; that is, it is not adversely affected by problems associated with single particle analysis, and it adequately accounts for potentially important particle characteristics such as particle morphology and surface porosity.
This resulted in passive retention (a.k.a. an enhanced permeability and retention effect) of 6.5% of the administered particle dose at the tumor site, as determined by quantification of the Si content in harvested organs using ICP-OES.
Because there was no difference in genotoxicity between the particles suspended in corn oil and saline solution, we believe that orally administered particles will distribute in the chyle of the intestinal juice, despite the fact that they may reach the gastrointestinal tract as agglomerates, as indicated by aqueous particle suspension characterization.
In this study, by application of the computational ISDD model [ 22], the delivered particle dose was determined to be similar for both NP sizes, considering separated particles as well as agglomerates of up to four particles, and was approximately 20% of the administered particle number.
The smaller particle size of 12 and 20 nm versus 220 and 250 nm also means that the administered particle number was more than three orders of magnitude higher for the NSPs, a factor that seems to be an important determinant for particle translocation across the alveolar epithelium, as are the delivered total dose and the dose rate (Ferin et al. 1992).
Although the intracellular particle concentration exceeded the initially administered particle concentration, no significant intracellular accumulation of particles above the delivered particle concentration, as determined by application of the ISDD model, was observed.
Effective density was then calculated from the pellet volumes of each ENM as described by Cohen et al. (51) A recently developed integrated dispersion and dosimetry platform at Harvard was used to calculate the fraction of administered ENM particles that would be deposited onto cells as a function of time, fD t).
Therefore, the uptake of intravenously administered iron particles by circulating macrophages that home to the stroke core could potentially alter the inflammatory response to stroke.
In addition, the fractional catabolic rate of exogenously administered remnant particles without apoE was 6-fold slower in the 3/3 mice compared with the +/+ mice.
Here, we examined whether intranasally administered silica particles of various sizes have the capacity to promote allergic immune responses in mice.
