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The comparative toxicity of a reduced, crude comfrey (Symphytum officinale) alkaloid extract and the pure, comfrey-derived pyrrolizidine alkaloids, lycopsamine and intermedine in chicks (Gallus gallus domesticus).
Brown AW, Stegelmeier BL, Colegate SM, Gardner DR, Panter KE, Knoppel EL, Hall JO. Brown AW, et al. Among authors: knoppel el. J Appl Toxicol. 2016 May;36(5):716-25. doi: 10.1002/jat.3205. Epub 2015 Jul 14. J Appl Toxicol. 2016. PMID: 26177929
Studies on the teratogenicity of anabasine in a rat model.
Welch KD, Lee ST, Panter KE, Gardner DR, Knoppel EL, Green BT, Hammond CK, Hammond ZJ, Pfister JA. Welch KD, et al. Among authors: knoppel el. Toxicon. 2014 Sep;87:32-7. doi: 10.1016/j.toxicon.2014.05.018. Epub 2014 Jun 4. Toxicon. 2014. PMID: 24905648
Wild parsnip (Pastinaca sativa)-induced photosensitization.
Stegelmeier BL, Colegate SM, Knoppel EL, Rood KA, Collett MG. Stegelmeier BL, et al. Among authors: knoppel el. Toxicon. 2019 Sep;167:60-66. doi: 10.1016/j.toxicon.2019.06.007. Epub 2019 Jun 4. Toxicon. 2019. PMID: 31173794
Hepatotoxic Plants that Poison Livestock.
Clayton MJ, Davis TZ, Knoppel EL, Stegelmeier BL. Clayton MJ, et al. Among authors: knoppel el. Vet Clin North Am Food Anim Pract. 2020 Nov;36(3):715-723. doi: 10.1016/j.cvfa.2020.08.003. Vet Clin North Am Food Anim Pract. 2020. PMID: 33032701 Review.
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