This is a postprint of an article published in Khomyakov, N.V., Kharin, S.A., Nechitailo, T.Yu., Golyshin, P.N., Kurakov, A.V., Byzov, B.A., Zvyagintsev, D.G. Reaction of microorganisms to the digestive fluid of earthworms. (2007) Microbiology, 76 (1), pp. 45-54.