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SUMMARY: The infra-red absorption spectra of 76 strains of lactobacilli representing 11 different species were examined. With only a few exceptions, the spectra could be grouped into 5 distinct spectral types, each corresponding to a Lactobacillus species or a group of related species. From a study of acetic acid extracts, it has been found possible to relate spectral differences to the relative concentrations of nucleic acids and carboxylate groups in the different organisms.
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Goulden et al. (1958) studied this question.
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