Here we describe stable isotope based models using hydrogen and carbon isotope ratios to predict geographic region-of-origin and growth environment for marijuana, with the intent of applying these models to analyses of marijuana trafficking in the USA. The models were developed on the basis of eradication specimens and border specimens seized throughout the USA. We tested reliability of the geo...

[This corrects the article on p. 244 in vol. 47, PMID: 25548722.].

The biological signal hidden in stable carbon, nitrogen, oxygen and strontium stable isotope ratios in archaeological and fossil skeletal finds give clues to a variety of palaeoecological parameters. In contrast to trace element analysis, these parameters can be assessed on the individual level, which is a major advantage for palaeoanthropology, where single finds prevail over multiple finds at...

Isotopes of many elements have been used in terrestrial, atmospheric, and aqueous environmental studies, providing powerful tracers and rate monitors. Short-lived nuclides that can be used to measure time are continuously produced from nuclear reactions involving cosmic rays, both within the atmosphere and exposed surfaces, and from decay of long-lived isotopes. Nuclear activities have produced...

In stable isotope ratio mass spectrometry (IRMS), the stable isotopic composition of samples is measured relative to the isotopic composition of a working gas. This measured isotopic composition must be converted and reported on the respective international stable isotope reference scale for the accurate interlaboratory comparison of results. This data conversion procedure, commonly called norm...

BACKGROUND Tracking timber is necessary in order to prevent illegal logging and protect local timber production, but there is as yet no suitable analytical traceability method. Stable isotope ratios in plants are known to reflect geographical variations. In this study we analysed four stable isotope ratios in order to develop a model able to identify the geographic origin of Norway spruce in th...

Article history: Received 6 May 2015 Received in revised form 16 March 2016 Accepted 19 March 2016 Available online 21 March 2016 Many studies of Quaternary climatemake use of terrestrial stable isotope records which are interpreted based on seasonal patterns of stable isotopes in modern precipitation. Multi-decade records of isotopes in rainfall allow testing of the assumed behavior of isotope...