Ceftriaxone inhibits the synthesis of the bacterial cell wall by binding to proteins that bind to penicillin. This antibiotic is a cephalosporin with a high affinity for acidic pH and chloride ions. Ceftriaxone is active against many Gram-negative and Gram-positive bacteria, such as Enterococcus faecalis, Clostridium difficile, and Methicillin-resistant Staphylococcus aureus (MRSA). Ceftriaxone is also active against Mycobacterium tuberculosis and Mycobacterium avium complex. Ceftriaxone has specific kinetic properties that are useful in industrial applications for determining the molecular weight of an unknown molecule or measuring viscosity.