DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Streptomycin. Polarised light micrograph of crystals of the antibiotic drug streptomycin. This is an aminoglycoside type of antibiotic, a drug used to treat infections caused by bacteria. Streptomycin was discovered in the 1940s and was the first effective drug treatment for tubercu- losis (TB). It is still used to treat resistant strains of bacteria causing TB, but because of serious side-effects streptomycin has largely been replaced by other antibiotics. Streptomycin is, however, still used to treat uncommon infections such as plague, brucellosis, and glanders. It may be used with penicillin to treat endocarditis. Magnification: x25 at 35mm size.
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