First, gram-negative bacteria have a thin cell wall that is about 1.5 to 10 nanometers across, whereas gram-positive bacteria have a thick cell wall measuring about 20 to 80 nanometers.

These compounds are small enough to pass through the bacterial cell wall ... the bacterial growth. The Gram-positive rod, Bacillus subtilis is lipase positive (pictured on the right) The plate ...

If the tube is colorless (picture on the right) after the addition of Zn this indicates a positive test. In today's lab we will begin the characterization of Gram-negative bacilli. The nitrate test, ...

By analyzing E. coli protein levels, scientists found a surplus of membrane shuttle proteins that may play a role in ...