beta-carotene

Directory

References

Discover

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.

What is Holy Week?

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

German machine gunners occupy a trench during World War I.

Weapons of World War I

Hemp (Cannabis sativa).

9 Mind-Altering Plants

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

beta-carotene

vitamin

Also known as: provitamin A

Learn about this topic in these articles:

conjugated bonds responsible for colour

In chemical compound: Ultraviolet and visible (UV-visible) spectroscopy
…bright orange colour of carrots, β-carotene, contains 11 conjugated π bonds. UV-visible spectroscopy is especially informative for molecules that contain conjugated π bonds.
Read More

distribution

In vitamin: Sources
…tissues or species; for example, beta-carotene, which can be converted to vitamin A, is synthesized in plant tissues but not in animal tissues. On the other hand, vitamins A and D₃ (cholecalciferol) occur only in animal tissues. Both plants and animals are important natural vitamin sources for human beings. Since…
Read More

vitamin A source

In vitamin A
…of these pigments, beta-carotene (provitamin A) is an excellent source of vitamin activity. The existence of vitamin A was first clearly recognized in 1913, its chemical nature was established in 1933, and it was first synthesized in 1947.
Read More