If you were to walk at night through certain forests around the world, you might notice a mushroom glowing green. There are about 80 species of bioluminescent fungi around the globe. Scientists studying two of those species native to Brazil and Vietnam write in the journal Science Advances that they now know the exact chemical reaction that allows fungi to emit light. Turns out, it’s a lot like fireflies.
The chemical reaction involves an enzyme called luciferase (which, depending on how poetic you want to get, can be interpreted as “devil-maker,” or “maker of the light-bringer” or, most accurately, “enzyme that helps a compound called ‘luciferin’ do stuff”).
The enzyme helps luciferin gain oxygen molecules, which excites it. Once it’s excited, luciferin will release light as it returns to its usual, non-excited state. The green light it releases is called “cold light” because there’s almost no heat involved.
There are a lot of different types of luciferin. The one used by these mushrooms, identified in 2015, is different from the others identified in plants and animals. In the lab, the scientists found that the enzyme used by fungi to produce light can be used to make all sorts of colors, not just green.
Fun fact: It’s thought that reactions like these originally came about to get rid of extra, unattached oxygen molecules – in the same way that blueberries are sold as “antioxidants” to help human bodies get rid of free radicals, aka free-floating oxygen atoms.
- Rae Ellen Bichell
Image source: Cassius V. Stevani/IQ-USP, Brazil, Science Advances
Today’s plankton class resulted in our water samples taken near shore being cloudy pink. The culprit turned out to be huge numbers of dinoflagellates called Noctiluca scintillans, a bioluminescent plankton commonly called “sea sparkle” due to their ability to glow a bright blue when disturbed.
I know where I’ll be after sundown - on the beach, splashing around in the glowing surf like a giddy fool.
Today is World Oceans Day, a global day of ocean celebration and collaboration for a better future. A healthy world ocean is critical to our survival. Together, let’s honor, help protect, and conserve the world’s oceans!
1. While the Earth’s oceans are known as five separate entities, there is really only one ocean.
2. The ocean contains upwards of 99% of the world’s biosphere, that is, the spaces and places where life exists.
3. Jellyfish are soft because they are 95% water and are mostly made of a translucent gel-like substance called mesoglea. With such delicate bodies, jellyfish rely on thousands of venom-containing stinging cells called cnidocytes for protection and prey capture.
4. Plastics & litter that make their way into our oceans are swiftly carried by currents, ultimately winding up in huge circulating ocean systems called gyres. The earth has five gyres that act as gathering points, but the largest of all is known as the ‘Great Pacific Garbage Patch’ and has grown so immense that the oceanic garbage patch can shift from around the size of Texas, to something the size of the United States.
5.The 200 or so species of octopuses are mollusks belonging to the order Cephalopoda, Greek for ‘head-feet’. Those heads contain impressively large brains, with a brain to body ratio similar to that of other intelligent animals, and a complex nervous system with about as many neurons as that of a dog.
6. Some lucky animals are naturally endowed with bioluminescence, or the ability to create light. The firefly, the anglerfish, and a few more surprising creatures use this ability in many ways, including survival, hunting, and mating.
On this night, several glows were evident – some near, but some far. The foreground glimmers blue with the light of bioluminescent plankton. Next out, Earth’s atmosphere dims the horizon and provides a few opaque clouds. Farther out, the planet Venus glows bright near the image center. Farthest away, rising diagonally, is the central band of our Milky Way Galaxy. Most of the billions of Milky Way stars and dark clouds are thousands of light years away.
The image was taken last November on the Iranian coast of Gulf of Oman.