Fig. 1From: Two-year intermittent exposure of a multiwalled carbon nanotube by intratracheal instillation induces lung tumors and pleural mesotheliomas in F344 ratsCharacterization of the test material. A SEM image of Taquann-MWNT-7. B Morphological classification of the individual fibers. The straight fibers account for 98.8% of all examined fibers (left). Representative images of the 3 structures (right), C Length and width distribution of MWNT-7. D DLS analysis. The peak of the hydrodynamic diameter is 669Â nmBack to article page