With respect to Δ Δ DR , these decreases are statistically significant (one-tailed t -test: P <0.05) except for leaf cellulose synthesized under HF conditions which comes, however, close to being statistically significant ( P <0.08).
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Intramolecular carbon isotope signals reflect metabolite allocation in plants.
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The sentences
We support our theoretical framework by linking it to previously reported whole-molecule 13 C/ 12 C increases in cellulose of ozone-treated Betula pendula and a highly significant relationship between the intramolecular signal and tropospheric ozone concentration.