Issue Date: Sep 30, 2005
abundant bacteria: Scientists say soil contains 100 times more bacteria species than believed. Previous studies estimated a gramme of unpolluted soil contained about 10,000 bacteria species. But a fresh analysis of soil data by researchers at the Los Alamos National Laboratory in New Mexico, the US, suggests the actual number is probably closer to 1 million or more. The old estimate was based on the assumption that all the bacteria species in a sample were equally abundant.