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  • Climatic and soil parameters were characterized and bark samples were analyzed for content of the four major alkaloids using HPLC-UV to explore the utility of evolutionary history (phylogeny) in determining variation within species of these compounds under natural conditions. (frontiersin.org)
  • As a result of selection, the alkaloid content in the bark was raised from 2-2.5 percent to 16 percent. (thefreedictionary.com)