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Ring systems size samples

Asphaltene chemical structure was probed by UV-F spectroscopy to determine trends in aromatic cluster sizes. As in the case of SEC results, all asphaltenes showed similar spectra, except the sample with the lowest API gravity (10°), which also showed a larger polyaromatic ring systems. [Pg.16]

Fio. 9. Normalized distance distribution function of the polar coordinate r for all protein atom-aromatic ring contacts as defined by the coordinate system depicted in Pig. 8 (< 10 A). Each value of the distance distribution function was normalized for sample size by dividing the observed frequency by r2. [Pg.154]

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Ring size

Sampling sample size

Sampling size

Sampling system

System size