40 



METABOLIC PATHWAYS IN MICROORGANISMS 



lites. The range of readily available compounds includes 

 glucose 1-, 2-, 3-, 3,4-, 6-, and U-C^^; similarly labeled glu- 

 conate; pyruvate 1-, 2-, and 3-Ci^; and acetate 1- or 2-Ci*. 

 These substrates represent all major sources of carbon in the 

 currently recognized metabolic pathways. 



The apparatus used is represented in the sketch in Fig. 

 2.6. As will be seen, it consists of a modified Warburg 



Fig. 2.6. The interval racliorespirometcr. (Courtesy of Krishell Lab- 

 oratories, Portland, Oregon.) 



