once volatile fatty acid production was stable , perturbations were imposed in consecutive cultures by the addition of one of each of the following pentoses or analogous pentitols : l-arabinose , d-lyxose , d-ribose , d-xylose , l-arabitol , d-arabitol ( lyxitol ) , ribitol , and xylitol .
C0030894
pentoses
C0035549
ribose