Magnetite formation by a magnetic bacterium capable of growing aerobically

Tadashi Matsunaga*, Toshifumi Sakaguchi, Fumihiko Tadakoro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

265 Citations (Scopus)


A helically shaped magnetic bacterium was isolated from freshwater sediment and a pure culture was obtained. The growth medium contained succinate, nitrate and ferric malate as the carbon, nitrogen and iron sources, respectively. The magnetic bacterium, designated AMB-1, was able to grow in free gaseous exchange with an air atmosphere. When cells were grown aerobically on agar, oxidase activity was present, and white non-magnetic colonies, which did not show catalase activity, were formed. The stationary phase of growth was reached 4-5 days later at a cell concentration of 1.4×109 cells/ml in liquid culture when an initial cell concentration of 105 cells/ml was employed. After ultrasonic disruption of harvested cells, 2.6 mg bacterial magnetite was obtained from a 11 culture.

Original languageEnglish
Pages (from-to)651-655
Number of pages5
JournalApplied Microbiology and Biotechnology
Issue number5
Publication statusPublished - 1991 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology (medical)
  • Microbiology
  • Bioengineering
  • Biotechnology


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