There are many ways of classifying bacteria. One method is based on the cell membrane. In 1884, a bacteriologist named Christian Gram created a test that could determine if a bacterium had a thick ...

Gram-positive bacteria have thick cell walls. A Gram stain test, which involves a chemical dye, stains the bacterium’s cell wall purple. On the other hand, gram-negative bacteria stain pink instead.

CERTAIN platinum compounds completely but reversibly iiihibit cell division in Gram-negative rods 1–4. These compounds have been tested for antitumour activity and we report some of the ...