|
THE INSIDE STORY—Richelia are cyanobacteria that live symbiotically inside single-celled marine plants called diatoms. The cyanobacteria have specialized dinitrogen-fixing cells that provide nitrogen to their hosts. Top: a light micrograph of the diatom Hemiaulus sp. Bottom: an epifluorescence light micrograph of the same cells, showing the red chloroplasts of the diatom and the orange fluorescence of the barbell-shaped endosymbiotic Richelia. (Photo by Dave Caron, Woods Hole Oceanographic Institution)[back]
|
|
