Figure 2.

Nanotube agglomeration in the tissue culture media. Multi-wall and single-wall nanotubes were prepared in serum and diluted into tissue culture media as described in Methods. The solutions, at the concentrations indicated, were added to six-well Transwell chambers and incubated for 48 h at 37°C. The media was removed. The Figure shows the agglomerated particles that were deposited on the apical side of the cellular monolayers under these incubation conditions.