Detection of organisms in marine sediments by incubating an intact sediment core sample with the fixable, cell-permeant CellTracker™ Green CMFDA (Cat. No. C2925, C7025). The core sample was subsequently embedded, sectioned and examined for fluorescently labeled organisms. The micrograph reveals the microorganism Leptohalysis scotti, a marine benthic foraminifera. Image contributed by Joan M. Bernhard, Wadsworth Center, New York State Department of Health.