Used primarily as an antibiotic in microbiological applications, especially in cell culture and molecular biology. It is effective against a range of Gram-negative bacteria, including Pseudomonas aeruginosa and Escherichia coli. Commonly used in selection media for recombinant DNA experiments where ampicillin might degrade too quickly, as carbenicillin disodium is more stable and provides longer-lasting selection pressure. Frequently used in plant transformation studies and bacterial transformation protocols in research laboratories. Also applied in tissue culture to prevent bacterial contamination when working with sensitive eukaryotic cells.