Abstract
All gram-negative bacteria examined, Escherichia coli, Vibrio cholerae and Pseudomonas aeruginosa, showed a characteristic wavy surface. The gram-positive bacteria, Bacillus subtilis and Streptococcus haemolyticus, appeared relatively smooth compared to E. coli. The gram-positive bacteria also exhibited ridges extending around the circumference of the cell, dividing it into 2 or more areas. No flagella were seen on E. coli or B. subtilis.

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