Although most bacteria are harmless or often beneficial, several are pathogenic. One of the bacterial diseases with the highest disease burden is tuberculosis, caused by the bacterium Mycobacterium tuberculosis, which kills about 2 million people a year, mostly in sub-Saharan Africa.athogenic bacteria contribute to other globally important diseases, such as pneumonia, which can be caused by bacteria such as Streptococcus and Pseudomonas, and foodborne illnesses, which can be caused by bacteria such as Shigella, Campylobacter, and Salmonella.
exists and is an alternate of . The brooms are used to sweep the ice in front of a sliding rock. The friction created from sweeping melts the ice just a tiny bit, enough to decrease the friction between the rock and the ice, making the rock both slide farther and slide straighter (curl less).
Curling Game Basics. What is this game of rocks and brooms all about? Curling is a sport in which two teams of four players each slide 40-pound granite rocks (also called stones) down a sheet of ice toward a target at the other end. Each team tries to get more of its stones closer to the center of the target than the other team. Read on for a complete breakdown of curlingâs basic elements.