Chronic periodontitis is strongly associated with composition of the oral biofilm
occupying the gingival crevicular aspect of the tooth and its associated root. Some gram-negative,
"red complex" bacteria instigate periodontal bone loss in...
Boat & ship industry; Steamboats; Transportation; Military facilities; Rivers
A steamboat is coming in towards the bank of the Ohio River in winter. Ice is visible in the water. The U.S. Life Saving Station, or the U.S. Coast Guard, is in the background. Title supplied by caption under photo.