Phosphorescence

(fos-for-es/-ens). The spontaneous luminosity of certain substances, like that of phosphorus, in the dark. It is observed in decomposing organic matter, such as dead fish, wood, etc.; in the bodies of certain plants and animals, such as the marigold, fire -fly; in the excreta of some animals; in the growth of several species of bacteria; in natural or artificial media. The proce is accompanied by oxidation. Several bacteria are known to produce phosphorescence. Thus, the Bacillus phosphores cens (Fischer) is found in the seawater of the West Indies. Another phosphorescent organism was found by Fischer in the harbor of Kiel. The most common is the Bacterium phosphores cens, which occurs on the decomposing flesh of fishes, on beef, or fat. The Photo bacterium sarcophilum also has the property of producing phosphorescence. See Photogenic.