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. Author manuscript; available in PMC: 2022 Jun 4.
Published in final edited form as: Front Sustain Food Syst. 2021 Jun 10;5:620470. doi: 10.3389/fsufs.2021.620470

FIGURE 2 |.

FIGURE 2 |

(A) ‘ “he hierarchy of terms for the “concentration of aluminium in plant structure.” Plant structure terms are imported from the Plant Ontology (Cooper et al., 2013) and chemical terms are imported from ChEBI. (B) The logical definition of “concentration of chemical entities in plant structure.” (C) The logical definition of “concentration of elemental aluminium in root.” An ontological reasoner uses these logical definitions to infer the hierarchy shown in (A). (D) The hierarchy for “concentration of elemental aluminium in environmental material” is generated similarly to the hierarchy for concentrations in plant structures. Note that ChEBI is an international ontology that uses the British spelling “aluminium” shown in the figure, but our search engine includes the American spelling “aluminum”.