Screening of buoyant marine cyanobacteria using sucrose gradient centrifugation

Mitsufumi Matsumoto, Hideaki Miyashita, Haruko Takeyama, Tadashi Matsunaga*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A centrifugation method using a sucrose density gradient was established to distinguish buoyant cyanobacterial cells based on their cell density. The marine strain Nostoc NKBG 500017 was selected, because it showed the lowest density among 71 strains examined from our culture collection and also exhibited stable buoyancy. The cell suspension was homogeneous in a 100 mL graduated cylinder in the dark for at least 12 h. Stability was also confirmed using an artificial water column consisting of polyethylene pipe 2 m in height and 11 cm in diameter with a halogen light source at the top. Cells were suspended well throughout the water column and no precipitation was observed at the bottom of the column after 24 h incubation. Most cells were retained in the upper part of the water column from 10 cm to 30 cm depth. Growth was inhibited by the addition of tributyltin (TBT), an endocrine disruptor. The autofluorescence intensity of the cells decreased with increasing TBT concentration. The stable buoyancy and TBT sensitivity of Nostoc NKBG 500017 indicate that the strain is a possible candidate for monitoring contamination by toxic chemicals in the marine environment.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalJournal of Applied Phycology
Issue number2
Publication statusPublished - 2002
Externally publishedYes


  • Buoyancy
  • Marine cyanobacteria
  • Monitoring
  • Sucrose density gradient

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science


Dive into the research topics of 'Screening of buoyant marine cyanobacteria using sucrose gradient centrifugation'. Together they form a unique fingerprint.

Cite this