| http://www.w3.org/ns/prov#value | - External electron donors may be those described by the formula SiRm(OR???)4-m, where R is an alkyl group, a cycloalkyl group, an aryl group or a vinyl group, R??? is an alkyl group, m is 0-4, each R??? may be the same or different, and each R may be the same or different.
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