Gram-positive bacteria show blue or purple after Gram-staining in a laboratory test. They have thick cell walls. Gram-negative bacteria show pink or red on staining and have thin walls. They release ...

Researchers have discovered how antibiotic-resistant bacteria construct their defense system -- a finding that could lead to new treatments for currently untreatable infections. Superbugs, also known ...

This unprecedented view of the tough outer membrane of Gram-negative bacteria, a group that includes species such as A. baumannii, P. aeruginosa, Salmonella and E. coli, comes from scientists at ...

The researchers tested these compounds individually against gram-negative bacteria, looking for those that successfully accumulated inside the cells. "The few that got in all had amines on them, so we ...

A new drug conjugate tricks Gram-negative bacteria into succumbing to an antibiotic that usually works only against Gram-positive bacteria. Gram-negative bacterial infections are tough to treat ...

Hans Christian Gram, the inventor of the Gram staining technique, was a pioneering biologist who devised the system of classification which led to as many as 30,000 formally named species of bacteria ...

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, ...