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23 paź 2020 · Key Points. Carbon isotopes, 14 C and 13 C, in atmospheric CO 2 are changing in response to fossil fuel emissions and other human activities. Future simulations using different SSPs show continued changes in isotopic ratios that depend on fossil fuel emissions and, for 13 C, BECCS.
1 gru 2019 · The stable isotopes of carbon (δ 13 C) track changes in photosynthesis, respiration, organic matter decomposition and anthropogenic fuel emission inputs (e.g., McDowell et al., 2008), while the oxygen isotopes of water (δ 16 O and δ 18 O) contain information on the linkages between the carbon and water cycles (Dawson and Simonin, 2011).
17 lis 2023 · Isotopic measurements provide valuable information about the origin of greenhouse gases — as carbon dioxide levels increase, there is a corresponding shift towards lighter isotopic composition similar to that of fossil fuels.
1 sie 2015 · If only two carbon sources (e.g. glucose and glutamine) contribute to the formation of a metabolite, the sum of FC from glutamine and FC from glucose will be 100% or 1 for this metabolite (Figure 2 b). Thus, the relative contributions of carbon sources to a metabolite can be determined from FCs.
1 paź 2019 · Stable carbon isotope ratios (13 C/ 12 C), expressed as δ 13 C values, are widely used in modern Earth sciences. δ 13 C CO2 values of atmospheric carbon dioxide reflect global climate evolution and change.
10 paź 2020 · This review focuses on the current understanding of carbon flux in gluconeogenesis, including substrate contribution of various gluconeogenic precursors to glucose production. Alterations of gluconeogenic metabolites and fluxes in T2DM are discussed.
4 wrz 2017 · Gross primary production (GPP)—the uptake of carbon dioxide (CO2) by leaves, and its conversion to sugars by photosynthesis—is the basis for life on land.
