Microbial Physiology and structure Morphology Straight or slightly curved Gram bacterial Polar flagella; motile Some strains appear mucoid due to polysaccharide capsule Some produce diffusible pigments Pyocyanin(blue), fluorescin (yellow), pyorubin (red-brown) BIOL 533 Lecture 13BIOL 533 4 Lecture 13 Microbial Physiology and Structure • Morphology – Straight or slightly curved Gram— bacterial • Polar flagella; motile – Some strains appear mucoid due to polysaccharide capsule – Some produce diffusible pigments • Pyocyanin (blue), fluorescin (yellow), pyorubin (red-brown)