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This measurement is very close to the theoretical composition of SiO2 (33.3 at.% of Si).
The comparison between the experimental and theoretical composition ratios for both CRMs led to good agreement, between 0.27% and 11%, for elements certified in both CRMs.
The local composition measured by counting silicon and oxygen atoms for the SiO2 layers gives a composition of 34.3 ± 0.3 at.% of Si which is in close agreement with the theoretical composition (33.3 at.% of Si).
From the analysis of exudates released by Methylosinus trichosporium OB3b and isolated following the one-step purification protocol published by Choi et al. [21], however, we found that the elemental composition (mainly C, N, and S) diverges largely from the theoretical composition of methanobactin according to the structure proposed by Behling et al. [16].
The atmospheric proportions of hydrogen and helium are close to the theoretical composition of the primordial solar nebula.
(right ) Result when there is uninterrupted segregation (theoretical composition).
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Elemental analyses were consistent with the theoretical compositions.
We evaluated the two models by quantifying theoretical compositions of a large collection of protein-coding sequences (including 46 of Archaea, 686 of Bacteria, and 826 of Eukarya), yielding consistent theoretical compositions across all the collected sequences.
All the mixtures conformed to the theoretical compositions, and there was not evolution during storage (Table 2).
Here we present two models that calculate theoretical compositions of nucleotides, codons, and amino acids in quantitative ways.
GPC and H-NMR spectroscopic analysis revealed the formation of well-defined polymers (PDI≤1.20) with compositions close to the theoretical compositions.
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