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Observation of a P. aeruginosa pure culture under optical microscope (40×) in the presence of raw silk. (A) 12 h of incubation; (B) 48 h of incubation. Note the intense bacterial colonization observed on the surface of silk fibers in the 48-hour culture, where silk biodegradation was already apparent. At some points fibers experienced a considerable decrease in thickness (points marked with arrows), which could cause the fibers to break into shorter fragments.
