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 Macchiato, also known as the Caffe Macchiato or Espresso Macchiato, has a bolder flavor than many other coffee drinks. It's comprised of a small amount of milk with a lot of espresso. Rather than thinking of ratios, it's easier to view the macchiatto as an espresso with a spot of milk in it. In fact, the word macchiato means spotted in Italian. In Portugal, the macchiato is referred to as cafe pingado, or coffee with a drop. If you like your coffee to be strongly flavored, this drink is right up your alley. Macchiato can have foam on it, but it's usually a small layer of microfoam to allow the taste of the espresso to shine. Using high quality espresso beans in macchiato is essential, as it's the primary flavor of the drink. Latte / Caffe Latte