Each new core has provided a piece of the puzzle, as the researchers measured the concentrations of key chemicals preserved in thousands of years of accumulated ice. (sciencedaily.com)
They give plants their green color, convert sunlight to sugars, and carry out a variety of other key chemical processes; they even have their own DNA. (sciencemag.org)
Besides being a fundamental ion and participating in key chemical reactions, it also takes part in maintaining DNA and RNA stability. (fitnessandpower.com)