Below is a video of a two-row malted barley grain shown under the magnification of a microscope. The video allows you to see a closeup of the structure of the grain. The footage was taken under approximately 100 power magnification.
Here is a still shot of the grain under magnification:
Crushed Malted Barley – Malt shown under magnification.
The Reinheitsgebot, also known as the German Beer Purity Law, was originally drafted in 1487 and put into law on April 23rd, 1516 in the city of Ingolstadt, in Bavaria, Germany. The original Reinheitsgebot document stated that the only ingredients that could be used in the production of Bavarian beer were water, barley, and hops. In addition to ingredient restrictions, the document also set pricing standards for the sale of beer. At the time the Reinheitsgebot was drafted, the function of yeast in brewing was not understood, and for that reason it was not listed as an acceptable ingredient in beer.
The barley grain is the seed of the barley plant. It is a member of the grass family and is considered a cereal grain. There are two main classifications of domesticated barley, two-row and six-row. Two-row barley has a lower protein content but higher fermentable sugar content then six-row barley, but both are commonly used in brewing.