title: Attachment and detachment of living microorganisms using a potential-controlled electrode.
abstract: We developed an electrical modulation method for attachment and detachment of microorganisms. Living microorganisms suspended in non-nutritive media such as PBS⁻ and artificial seawater were attracted by and selectively attached to indium tin oxide (ITO)/glass electrode regions to which a negative potential was applied. The microorganisms suspended in LB medium and glucose solution were not attracted to the ITO electrode. Dead microorganisms were not attracted to the ITO electrode. The living microorganisms were retrieved after detachment from the ITO electrode by application of a high-frequency triangular wave potential. When we applied this method to separate microorganisms from deep-sea sediment, bacteria belonging to 19 phyla and 23 classes were collected without undesirable high molecular weight contaminants such as humic acids. At the phylum and class level, respectively, 95 and 87 % of the phylotypes among electrically retrieved bacteria were common to the gene clones from the direct sediment DNA extraction. This technique is a novel useful method to prepare bacterial cells in a single population or a community for metagenomic analyses.
authors: Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan. skoyama@jamstec.go.jp
authors: Sumihiro
authors: S
authors: Koyama
authors: Masa-aki
authors: MA
authors: Konishi
authors: Yukari
authors: Y
authors: Ohta
authors: Tetsuya
authors: T
authors: Miwa
authors: Yuji
authors: Y
authors: Hatada
authors: Takashi
authors: T
authors: Toyofuku
authors: Tadashi
authors: T
authors: Maruyama
authors: Yuichi
authors: Y
authors: Nogi
authors: Chiaki
authors: C
authors: Kato
authors: Taishi
authors: T
authors: Tsubouchi
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D001483:Base Sequence; D019295:Computational Biology; D017931:DNA Primers / Q000235:genetics; D004566:Electrodes / Q000382:microbiology*; D004574:Electromagnetic Fields; D019015:Geologic Sediments / Q000382:microbiology*; D007564:Japan; D056186:Metagenomics / Q000379:methods*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D010802:Phylogeny; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D013045:Species Specificity; D017971:Tin Compounds / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D017971:Tin Compounds; C109984:indium tin oxide