Hartnell's Time Machine: 170-year-old nails reveal zinc deficiency played a greater role than lead in the demise of the Franklin Expedition
Christensen, J.R., J.M. McBeth, N.J Sylvain, J. Spence, and H.-M Chan. 2016. Journal of Archaeological Science Reports. Available online.

Using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to characterize copper, zinc and mercury along grizzly bear hair providing estimate of diet.
Noel, M., J.R. Christensen, J. Spence, and C.T. Robbins. Science of the Total Environment 529:1-9, 2015

Grizzly bear hair reveals toxic exposure to mercury through salmon consumption.
Noel, M. J.Spence, K.A. Harris, C.T. Robbins, J.K. Fortin, P.S. Ross, and J.R. Christensen. Environmental Science and Technology 48(13):7560-7567, 2014

Biomagnification of polychlorinated biphenyls in a harbor seal (Phoca vitulina) food web from the Strait of Georgia, British Columbia (Canada)
Cullon, D.L., M.B. Yunker, J.R. Christensen, R.W. Macdonald, M.J. Whiticar, N.J. Dangerfield and P.S. Ross. Environmental Toxicology and Chemistry, 2012.

Persistent or not persistent? Polychlorinated biphenyls are readily depurated by grizzly bears (Ursus arctos horribilis).
Christensen, J.R., R.J. Letcher and P.S. Ross.  Environmental Toxicology and Chemistry 28(10): 2206-2215, 2009.

Hibernation-associated changes in persistent organic pollutant (POP) levels and patterns in British Columbia grizzly bears (Ursus arctos horribilis).
Christensen, J.R., M. MacDuffee, M. Yunker and P.S. Ross. Environmental Science and Technology 41(6): 1834-1840, 2007.

Effects of nonylphenol on tail resorption and metamorphic staging in Rana catesbeiana tadpoles.
Christensen, J.R., J.S. Richardson, C.A. Bishop, B. Pauli and J.E. Elliott. Journal of Toxicology and Environmental Health 68(7): 557-572, 2005.

Persistent organic pollutants in British Columbia grizzly bears: consequence of divergent diets.
Christensen, J.R., M. MacDuffee, M. Whiticar and P.S. Ross.  Environmental Science and Technology 39(18): 6952-6960, 2005.

Validation of an Amphibian Sperm Inhibition Toxicological Test (ASITT) method using zinc.
Christensen, J.R., C.A. Bishop, J.S. Richardson, B. Pauli and J.E. Elliott.  Environmental Toxicology and Chemistry 23(12): 2950-2955, 2004.

Effects of pH and dilution on African clawed frog (Xenopus laevis) sperm motility.
Christensen, J.R., B. Pauli, J.S. Richardson, C.A. Bishop and J.E. Elliott.  Canadian Journal of Zoology 82(4): 555-563, 2004.