title: Effect of humic substances on mitochondrial respiration and oxidative phosphorylation.
abstract: Fulvic and humic acids extracted from a podzol were shown to stimulate respiration in rat liver mitochondria, when present at concentrations of between 40 and 360 mg L-1. Low molecular weight fractions induced a more significant increase in respiration than high molecular weight material. Humic substances, at concentrations of between 40 and 400 mg L-1, normally also increased the efficiency of the process of oxidative phosphorylation in vitro, particularly after contact periods with the mitochondria of over 1 hour.
mesh_terms: D000818:Animals; D001578:Benzopyrans / Q000494:pharmacology*; D006812:Humic Substances / Q000494:pharmacology*; D066298:In Vitro Techniques; D008930:Mitochondria, Liver / Q000187:drug effects / Q000378:metabolism*; D008970:Molecular Weight; D010085:Oxidative Phosphorylation / Q000187:drug effects*; D010101:Oxygen Consumption / Q000187:drug effects*; D051381:Rats
chemical_list: D001578:Benzopyrans; D006812:Humic Substances; C005023:fulvic acid