How Bioluminescence Works

How Animals Make Light

In general, bioluminescence involves the combination of two types of substances in a light-producing reaction. One is a luciferin, or a light-producing substance. The other is a luciferase, or an enzyme that catalyzes the reaction. In some cases, the luciferin is a protein known as a photoprotein, and the light-making process requires a charged ion to activate the reaction. Neurological, mechanical, chemical or as-yet-undiscovered triggers can start the reactions that create light.
Often, the process requires the presence of other substances, like oxygen or adenosine triphosphate (ATP). ATP is a molecule that stores and transports energy in most living organisms, including the human body. The luciferin-luciferase reaction can also create byproducts like oxyluciferin and water.
The terms luciferin and luciferase both come from a Latin term lucifer, which means "light-bringer." They are generic terms rather than the names of particular chemicals. Lots of different substances can act like luciferins and luciferases, depending on the species of the bioluminescent life form. For example, the luciferin coelenterazine is common in marine bioluminescence. Dinoflagellates that obtain food through photosynthesis use a luciferin that resembles chlorophyll. Their luminescence is brighter after very sunny days. Some shrimp and fish appear to manufacture their luciferin from the food they eat.

Dinoflagellate species that rely on photosynthesis for food have luciferin that is similar to chlorophyll.
Not all animals produce their own light. Read on to learn about animals that rely on other life forms for their luminescence and about how living light can be helpful to humans.

State Of Things NC

Talking About Politics

NYT > The Upshot

Guernica / Art & Politics

Carolina Journal

Basketball, Lacrosse, etc.

Reason Magazine


Republic Report


The Page

Politico 10


Roll Call Special Sections

Free Press

TED Blog

ProPublica: Articles and Investigations

The Progressive Pulse

Huffington Post

Newser Politics

Politico Playbook

Project Syndicate


Politics Daily


White House

Politico Huddle


Episcopal Cafe