Abstract
1. 1. Activities and contents of the electron transport components of sheep ( Ovis aries) liver microsomes are given. Enzymes or enzyme systems assayed are NADH-cytochrome c reductase, NADH-ferrieyanide reductase, NADH-dichlorophenol-indophenol reductase, NADH- and NADPH-neotetrazolium reductase, cytochrome b 5, cytochrome P-450 and the cyanide binding protein. 2. 2. Prior lipid peroxidation of sheep liver microsomes did not markedly alter NADH- and NADPH-cytochrome c reductase or NADH-ferricyanide reductase activities but decreased NADPH-dependent aniline hydroxylation activity. Intermediate amounts of prior lipid peroxidation enhanced the activity of NADPH-dependent lipid peroxidation. 3. 3. NADH-cytochrome c reductase activity of sheep liver microsomes was decreased 39–56% when 60% of the microsomal organic phosphorus was removed by acetone:water 90:10 (v/v) extraction but was not markedly altered by the removal of 25 and 44% of the microsomal organic phosphorus by acetone:water 100:4 (v/v) and acetone:water 100:7 (v/v) extractions.
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