太子探花

• 
• 太子探花
• biofilm

biofilm

Credit: Courtesy National Park Service/Mike Litterst

Jefferson Memorial roof replacement, dome cleaning project nears finish line

National Park Service battles with microbial growth on Jefferson Memorial

Lasers vs. grime: Park service says treatment wiped out Jefferson Memorial’s black film

Park Service using lasers to remove Jefferson Memorial’s grimy coating

NPS ready to battle grimy biofilm coating on Jefferson Memorial