Virtual Lab 2

Gram Stain

• organism: Escherichia coli
• reaction: gram negative
•  morphology/arrangement: short bacillus, mostly single

Gram Stain

• organism: Bacillus cereus
• reaction: Gram positive
• morphology/arrangement: streptobacilli

Special Stains: Acid-fast stain, demonstrating Mycobacterium

Organism: Mycobacterium smegmatis

Mycobacterium smegmatis detected in a respiratory exudate (pus sample) as the broad clump of tiny, fuchsia-pink rods. 

Note: the dark blue rods are other bacteria present in the sample

Special Stain: Flagella stain demonstrating amphitrichous arrangement
Organism: representative bacteria

Polar amphitrichous arrangement: yellow  arrowsindicate the two flagella of this organism, one at each end