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Antibiotics are molecules which kill or prevent the growth of microorganisms. Antibiotics work by a number of different modes of action. They typically work by disrupting cell wall synthesis, preventing nucleic acid metabolism or disturbing a microorganism,s ability to synthesize proteins. Antibiotics can act on either gram-negative or gram-positive bacteria, and some are active against both. Antibiotics may also act on some yeasts, molds and mycoplasma. Major classes of antibiotics include: penicillins, tetracyclines, macrolides, cephalosporins, fluoroquinolones and aminoglycosides. These compounds are commonly used in molecular biology to select cell lines. They are also common supplements to cell culture media and buffers. We provide a comprehensive line of antibiotics as well as ready to use sterile filtered antibiotic solutions. To review all biochemicals offered on this website check the main categories under Life Sciences which include both Thermo Scientific and Alfa Aesar product options.