@article{oai:soar-ir.repo.nii.ac.jp:00003763,
 author = {Matsumoto,  Takehisa and Kawakami,  Yoshiyuki and Sueki,  Akane and Kasuga,  Eriko and Oana,  Kozue and Horiuchi,  Kazuki and Kato,  Miyuki and Honda,  Takayuki},
 issue = {4},
 journal = {JOURNAL OF INFECTION AND CHEMOTHERAPY},
 month = {Aug},
 note = {An Escherichia coli isolate was recovered from a 92-year-old female patient with urinary tract infection. Gram-stained preparation of the urine sediment manifested some gram-negative rod-shaped cells, and the urine specimen culture yielded nonhemolytic colonies on sheep blood agar plate. However, no visible colonies appeared on modified Drigalski agar plate. The isolate was finally identified as an X-factor-dependent E. coli. The interesting finding was that the isolate revealed a positive reaction for porphyrin test despite the requirement of hemin. This finding suggested that some pyrrol-ring-containing porphyrin compounds or fluorescent porphyrins had been produced as chemical intermediates in the synthetic pathway from delta-amino-levulinic acid (ALA), although the isolate should be devoid of synthesizing hems from ALA. This was the first clinical isolation of such a strain, indicating that the E. coli isolate should possess incomplete synthetic pathways of hems from ALA., Article, JOURNAL OF INFECTION AND CHEMOTHERAPY. 19(4):764-766 (2013)},
 pages = {764--766},
 title = {Isolation of an X-factor-dependent but porphyrin-positive Escherichia coli from urine of a patient with hemorrhagic cystitis},
 volume = {19},
 year = {2013}
}