She has discovered that the same protein sensor that detects sour flavors also responds to a different taste: ammonium chloride ... and helps form the tiny calcium carbonate crystals we need ...

This bacterium breaks down urea and produces ammonium and carbonate. When calcium is ... After spraying them multiple times ...

The microbes break down urea and form ammonium and carbonate. Then ... Then, when the columns were sprayed several times with calcium chloride and urea, the bacteria produced biocement.