RESEARCH in several laboratories has clearly demonstrated that aerated potato disks develop an increased capacity for uptake of oxygen1-7. This additional respiratory capacity is not increased by 2,4-dinitrophenol7 and is relatively insensitive to inhibition by cyanide6 and carbon monoxide5,6. However, cyanide8, low temparature (0-5° C.)7 or absence of oxygen at normal temperature8 will prevent the development of the increased respiratory capacity.