Bacteriocins may function as colonizing peptides, facilitating the introduction and/or dominance of a producer into an already occupied niche (48). Alternatively, bacteriocins may act as antimicrobial or killing peptides, directly inhibiting competing strains or pathogens (38).
At issue is whether some granite countertops emit dangerous levels of radiation, especially the gas radon, which is the second leading cause of lung cancer after smoking. Experts agree that most granite countertops emit some radon and even other types of radiation.
Some scientists believe that radon dissolved in the blood may cause additional diseases beside lung cancer. In addition to the gas, one-third of the inhaled radon decay particles also pass through the lungs into the blood stream and then, get trapped. As we breathe in through the skin, the air also carries radon gas.