Radiocarbon dating and the atomic bomb
Radiocarbon dating and the atomic bomb - benefits of consolidating 401ks
Example of sample from pulp cavity section of specimen SGP-1-2.
12 for NH and SH boundaries).) Remobilization of nonstructural carbon during plant growth: Muhr et al.We found only one specimen of the 231 analyzed to have a lag time longer than 6 y.Patterns of trade differ by regions: East African ivory, based on genetic assignments of geographic origin, has a much higher fraction of “rapid” transit than ivory originating in the Tridom region of Cameroon–Gabon–Congo.C to determine lag time between elephant death and recovery of ivory by law enforcement officials.Most ivory in recent seizures has lag times of less than 3 y.All of the calibration samples, and the assigned locations of ivory, fall in (or very near to) the mixing zone across the ITCZ, which separate the NH and SH zones where the “clean-air” sites are located.
Future calibrations for ivory, or for other wildlife products, to obtain “age” determinations using FIvory for date-of-death determination was sampled from the pulp cavity of tusks (the proximal end of the tusk; Fig. S2), which is where new ivory (dentine) was forming when the elephant died and thus most accurately records the date of death.Schematic of elephant ivory showing longitudinal cross-section of a tusk with pulp cavity, dentine, and cementum. 2) were taken from the proximal end to include the pulp cavity, where the thickness from pulp cavity to the outer cementum sheath was less than 2 cm.Modified from Fisher and Fox (32) with permission from University Press of Colorado.The rapid decline in elephants across Africa has been attributed to the high poaching rates and increased amount of ivory seized over the last decade or so (3).Total global seizures in excess of 40 tons of ivory have occurred in several years since 2010 (8), with over 70% of all ivory seizures exceeding 0.5 ton (hereafter termed “large seizures” or “large ivory seizures”).Central African forest elephant populations decreased by 62% from 2002 to 2011 (5).