Number  of Samples Silicon in Sample Silicon  on Spore Coat (% spores) Analytical Method Sample Types
28 0.01-0.5, av. 0.14 wt%   ICP-OES Miscellaneous
10 n.d.B   ICP-OES B. cereus
2 0.25 wt%   ICP-OES Dugway Rev. Engineered
(8) artifactC n.d. (2 examined) STEM-EDX Dugway Rev. Engineered
6   1-22% STEM-EDX Miscellaneous
8 0.3 wt.% n.d. STEM-EDX RMR 1029 & Miscellaneous
55 0.002-0.4, av. 0.03 wt%   NanoSIMS Miscellaneous
1   + D STEM-EDX from Stewart 1980
Total 118 samples: silicon 0-<0.3 wt% in 107 samples; 0.3-0.5 wt% in 3 samples; shown to be an artifact in 8 samples. ABased on data in Table 1, excluding attack samples. Bn.d. signifies not detected. CSee text: silicon detected by ICP-OES in 8 Dugway Reverse Engineered samples has been shown to be a milling artifact. D+ signifies “detected”.
Table 3: SummaryA: Silicon in Bacillus Spore Preparations.