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.
How to Make a Macchiato Coffee. Community Q&A. CafÃ¨ Macchiato is Italian for marked (with froth). A CafÃ¨ Macchiato is a small simple drink of an espresso shot or double shot marked with a touch of delicious frothy milk. It is not a latte or a cappuccino, but rather an espresso 'marked' on the top with a dollop of foam to cover the espresso and protect it from air. Though a tiny drink, a Macchiato can be one of the most difficult espresso based drinks to pull off well.