Kanamycin sulfate is widely used in the field of microbiology as an antibiotic to inhibit the growth of bacteria. It is particularly effective against Gram-negative bacteria and is commonly added to culture media to select for or against specific bacterial strains in laboratory experiments. In molecular biology, it is often used as a selective agent in the transformation of cells, ensuring that only those cells that have taken up a plasmid containing a kanamycin resistance gene will survive. Additionally, it is employed in veterinary medicine to treat infections in animals, particularly those caused by susceptible strains of bacteria. In agriculture, kanamycin sulfate is sometimes used to control bacterial diseases in crops, although its use is carefully regulated to prevent the development of antibiotic resistance.