Calcium phosphate crystal formation in Escherichia coli from human urine: An in vitro study

M. S. Cohen, C. P. Davis, E. W. Czerwinski, M. M. Warren

    Research output: Contribution to journalArticle

    9 Scopus citations


    Escherichia coli with no demonstrable urease activity was inoculated into filter sterilized urine obtained from a healthy volunteer subject with no history of stone disease and then incubated at 37C. Bacteria were recovered at intervals between 1 and 10 days. Urinary pH was stable as compared to control urines and spontaneous crystal precipitation was not noted in controls. Recovered organisms were analyzed by x-ray powder diffractometry. An uncharacterized mineral phase (UMP) was first evident after 6 days. Calcium phosphate in the form of brushite and hydroxyapatite was apparent at 7 and 10 days respectively. This suggests a role for bacteria in calcium phosphate crystal formation in urine apart from urease activity and may contribute to the calcium phosphate component of urinary calculi.

    Original languageEnglish (US)
    Pages (from-to)184-185
    Number of pages2
    JournalJournal of Urology
    Issue number1
    StatePublished - Jan 1 1982


    ASJC Scopus subject areas

    • Urology

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