Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

Mysterious Glow

What is

“bioluminescence”?

GLOW STICKS

You may know them from parties,

but they are also used as

emergency lights in rescue

operations. They also contain

chemicals that mix together when

you bend the stick, which breaks a

glass tube inside it. Depending on

the specific chemicals used, they

glow red, blue, green, pink, or

yellow.

In nature, there are many living things

that use cold light of the sort that you

produced with luminol. You probably

know about fireflies — little beetles that

use their green light to find a mate. The

marine phosphorescence that delights

sailors in tropical waters comes from

microscopically tiny living creatures in

the water.

Cold light is especially handy for

animals that live in the eternal darkness

of the ocean depths. A lot of them,

though, don’t actually produce the light

themselves. Instead, they store

luminescent bacteria in parts of their

bodies. Deep-sea anglerfish, for example,

have developed a luminescent organ

resembling a fishing rod, which they use

to lure their prey into their mouths.

Certain deep-sea squid also hunt with the

help of flashes of light. Vampire squid use

the light for defense: They confuse their

pursuers with a luminescent cloud of ink

and use it to make their getaway.

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