title: Evidence for detachment of indigenous bacteria from aquifer sediment in response to arrival of injected bacteria.
abstract: Two bacterial strains isolated from the aquifer underlying Oyster, Va., were recently injected into the aquifer and monitored using ferrographic capture, a high-resolution immunomagnetic technique. Injected cells were enumerated on the basis of a vital fluorescence stain, whereas total cell numbers (stained target cells plus unstained target and antigenically similar indigenous bacteria) were identified by cell outlines emanating from fluorophore-conjugated antibodies to the two target strains. The arrival of injected bacteria at the majority of monitored sampling ports was accompanied by simultaneous temporary increases in unstained cell counts that outnumbered the injected bacteria by 2- to 100-fold. The origin and mechanism of appearance of the unstained cells are considered.
authors.affiliation: Department of Geology and Geophysics, University of Utah, Salt Lake City 84112, USA. wjohnson@mines.utah.edu
authors.forename: W P
authors.initials: WP
authors.lastname: Johnson
authors.forename: P
authors.initials: P
authors.lastname: Zhang
authors.forename: P M
authors.initials: PM
authors.lastname: Gardner
authors.forename: M E
authors.initials: ME
authors.lastname: Fuller
authors.forename: M F
authors.initials: MF
authors.lastname: DeFlaun
mesh_terms: D001422:Bacterial Adhesion; D020562:Betaproteobacteria / Q000502:physiology*; D020585:Comamonas / Q000502:physiology*; D005290:Ferric Compounds; D005456:Fluorescent Dyes; D005618:Fresh Water / Q000382:microbiology*; D019015:Geologic Sediments / Q000382:microbiology*; D018189:Immunomagnetic Separation; D013194:Staining and Labeling / Q000379:methods
chemical_list: D005290:Ferric Compounds; D005456:Fluorescent Dyes