Carbonic anhydrase 1 is an enzyme that in humans is encoded by the CA1 gene. Carbonic anhydrases are a large family of zinc metalloenzymes that catalyze the reversible hydration of carbon dioxide.
It is becoming more common that the latte macchiato will have a layer of milk foam on the top of the drink as well. A latte is steamed milk, espresso, and a 1/4 inch of foam ontop. It is prepared in this order: flavored syrup (if applicable), espresso, steamed milk, topped with 1/4 inch of foam.
The differences between these drinks are subtle, but significant. Think of a cappuccino as drinking espresso and a little steamed milk through a cap of tons of light, fluffy, shaving cream-style foam. The espresso and steamed milk are sitting on the bottom of the cup, while the huge cap of light, fluffy, shaving cream-style foam is on top. A lattÃ¨ is a blend of espresso and velvetized foam. A lattÃ¨ is a little heavier in the hand than a cappuccino because the lattÃ¨ does not have that huge cap of light, fluffy, shaving cream-style foam. Finally, a lattÃ¨ is a little milder than a cappuccino due to the greater volume of steamed milk and velvetized foam.