Spirulina (spirr-you-line-a) a spiral bacterium, motile, moves by cork-screw motion. A blue-green alga. If the cells are irradiated with ultraviolet light, the pigment absorbs some radiant energy and re-emits at with lower energy - with the colour shifted to the red end of the spectrum. Fluorescence microscopy removes the irradiating ultraviolet light, leaving the red colour of the fluorescing pigments. Fluorescence microscopy.
Spirulina. Cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.