十万个为什么·科学阅读30篇（1）

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萤火虫如何发出不发热的冷光而不燃烧？

Fireflies produce light through a chemical reaction called bioluminescence, not combustion.
A molecule named luciferin reacts with oxygen, aided by the enzyme luciferase inside their bodies.
This reaction releases almost all energy as visible light—less than 0.01% becomes heat.
Because no flame or high temperature is involved, it’s known as ‘cold light’.
The color of light varies slightly among species due to subtle differences in luciferin structure.
Fireflies control blinking by regulating oxygen flow to light-producing cells in their abdomen.
Their flashing patterns serve as mating signals, with each species having a unique rhythm.
Researchers use firefly enzymes in labs to detect ATP, a key energy molecule in living cells.
Unlike LEDs or bulbs, bioluminescence needs no external power—only biological fuel.
This natural system inspires eco-friendly lighting designs and medical imaging tools.