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1. Mitochondria prepared from Torulopsis utilis grown in a chemostat with iron-limited growth were found to lack energy conservation but not electron flow in that segment of the respiratory chain leading from intramitochondrial NADH to the cytochromes [i.e. the site 1 segment (Lehninger, 1964)]. 2. Site 1 energy conservation was present in mitochondria prepared from cells grown under conditions of limitation by glycerol, ammonium and magnesium. Phosphate-limited growth resulted in mitochondrial preparations without respiratory control. 3. Mitochondria from cells grown under conditions of iron limitation were insensitive to the respiratory inhibitor piericidin A, whereas sensitivity was present in mitochondria prepared from glycerol-, ammonium-, magnesium- or phosphate-limited cells. 4. These observations are considered to provide indirect evidence for a role of non-haem iron in the mechanism of energy conservation and also piericidin A sensitivity in T. utilis mitochondria. 5. A readily constructed and inexpensive pH-measuring and -controlling circuit is described for use with continuous-culture apparatus.

biochemical journal. cellular aspects

A comparison of mitochondria from <i>Torulopsis utilis</i> grown in continous culture with glycerol, iron, ammonium, magnesium or phosphate as the growth-limiting nutrient

A comparison of mitochondria from Torulopsis utilis grown in continous culture with glycerol, iron, ammonium, magnesium or phosphate as the growth-limiting nutrient