Polymyxin B is an antibiotic primarily used for resistant Gram-negative infections. It is derived from the bacterium Bacillus polymyxa. Polymyxin B is composed of a number of related compounds (see `Mixture composition`). It has a bactericidal action against almost all Gram-negative bacilli except the Proteus and Neisseria genera. Polymyxins bin.....
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http://en.wikipedia.org/wiki/Polymyxin_B
(from the article `polymyxin`) ...antibiotics derived from various species of the soil bacterium Bacillus that are active against gram-negative bacteria such as Escherichia coli ...
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http://www.britannica.com/eb/a-z/p/90
<chemical> A mixture of polymyxins b1 and b2, obtained from bacillus polymyxa strains. They are basic polypeptides of about eight amino acids and have cationic detergent action on cell membranes. Polymyxin b is used for infections with gram-negative organisms, but may be neurotoxic and nephrotoxic. ... Pharmacological action: antibiotics, pep...
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http://www.encyclo.co.uk/local/20973
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