| http://www.w3.org/ns/prov#value | - Further, a substance selected from alkali metal oxides or alkaline earth metal oxides, such as lithium oxides (Li2O), calcium oxides (CaO), sodium oxide (Na2O), potassium oxide (K2O), and magnesium oxide (MgO), may be used as the substance showing an electron donating property to an electron transporting substance.
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