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Table 3 Average widths and lengths, and length distributions, of samples incubated in Gambles solution for 0 weeks or 10 weeks, as determined by TEM measurements

From: Durability and inflammogenic impact of carbon nanotubes compared with asbestos fibres

Sample Incubation Period (week) Width (nm) ± SE Length μ(m) ± SE % ≥ 100 μm 100 μm > % ≥ 20 μm 20 μm > % ≥ 15 μm 15 μm > % ≥ 10 μm 10 μm > % ≥ 5 μm % < 5 μm
X607 0 3500 ± 190 123 ± 7 58 36 4 1 1 0
  10 2100 ± 169* 76 ± 5* 33 55 6 3 2 0
LFA 0 550 ± 39 34 ± 3 5 50 8 16 13 8
  10 820 ± 52* 56 ± 4* 18 56 6 6 7 6
LFC 0 42 ± 1 10.8 ± 1 0 20 6 9 17 49
  10 43 ± 2 1.9 ± 0.3* 0 0 0 0 0 100
CNT SW 0 5 ± 0.3 3.6 ± 0.2 0 0 0 0 19 81
  10 5 ± 0.3 3.2 ± 0.4 0 0 0 0 18 82
CNT SPIN 0 9 ± 0.3 NAs NAs NAs NAs NAs NAs NAs
  10 14 ± 0.3* NAs NAs NAs NAs NAs NAs NAs
CNT LONG1 0 60 ± 2 12.4 ± 0.5 0 10 20 29 37 4
  3 65 ± 2 10.9 ± 0.5* 0 8 10 27 45 10
  10 63 ± 2 11.1 ± 0.4* 0 4 9 42 38 7
CNT TANG2 0 10 ± 0.4 NAs NAs NAs NAs NAs NAs NAs
  10 10 ± 0.4 NAs NAs NAs NAs NAs NAs NAs
  1. The dimensions of fibres, for which a start and end point could be identified in representative TEM images, were measured using Image J (NIH) calibrated software. The mean widths and lengths of samples incubated for 10 weeks were compared to their equivalent 0 weeks samples by an unpaired t-test, where statistical significance was set at p < 0.05 (denoted by an asterisk). Fibre dimensions were additionally determined for CNTLONG1 at 3 weeks incubation to assess whether the shortening seen at 10 weeks was part of a consistent trend.
  2. NAs: not assessable
  3. Note: Due to the difficulty in identifying and measuring individual CNTs within bundles in TEM images, these numbers should not be taken as absolute but indicative of trends only.