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These include: Selected Publications Joan Brenner Coltrain, Joel C. Non-essential amino acids occupy two of three positions in bone collagen's cross-linked amino acids chains.

30 years to replace existing carbon with an equivalent amount of carbon (Stenhouse and Baxter 1977, 193; see also Harkness and Walton 1972; Libby et al. Fractionation between plant tissues and bone collagen is 5 ‰ and approximates 1‰ at higher trophic levels.

In the present study, the fractionation ratio b was determined by independent experiments on the chemical reduction of carbon dioxide (CO photosynthesis pathways.

In addition, the analysis of over 9600 full-sized OX-I and OX-II normalizing standards measured between 20 confirms b values lower than 2.0.

1997), use C4 photosynthesis resulting in less discrimination against 13C and an average δ13C value of -12.5 ± 1.1 ‰ (n=455) (Cerling et al. Cacti and some members of the Agavacaea (yucca and agaves) use the CAM pathway, which alternates between C3 and C4 photosynthetic mechanisms and can produce isotope signatures as positive as C4 photosynthesis.

In the northern hemisphere, the atmospheric activity almost doubled by the early 1960s, however, following the partial test ban treaty in 1963, the activity has declined exponentially as the excess C has entered the oceans and the terrestrial biosphere.

The entire applied radiocarbon dating time-scale extends from about 300 years BP to about 50,000 years BP.

The current internationally-accepted value for living, terrestrial carbonaceous matter was determined from tree rings formed in the year 1890 and is quoted as 0.226 Bq g was observed due to the burning of fossil fuels (Suess, 1953; 1955), often termed the Suess effect.

Then, during the 1950s and early 1960s, the atmospheric testing of nuclear weapons increased the atmospheric C activity.