- Effects of esculin and esculetin on the survival of Escherichia coli O157 in human faecal slurries, continuous-flow simulations of the rumen and colon and in calves. Duncan, S.H., Leitch, E.C., Stanley, K.N., Richardson, A.J., Laven, R.A., Flint, H.J., Stewart, C.S. Br. J. Nutr. (2004)