
Monobactams are β-lactam compounds wherein the β-lactam ring is alone and not fused to another ring (in contrast to most other β-lactams, which have at least two rings). They work only against aerobic Gram negative bacteria (e.g., Neisseria, Pseudomonas ). The only commercially available monobactam antibiotic is aztreonam. Other examples of mon...
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http://en.wikipedia.org/wiki/Monobactam

A class of antibiotic that has a monocyclic beta-lactam nucleus and is structurally different from other beta-lactams; e.g., aztreonam. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: mon′ō-bak′tam Definitions: 1. A class of antibiotic that has a monocyclic β-lactam nucleus and is structurally different from other β-lactams; aztreonam.
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http://www.medilexicon.com/medicaldictionary.php?t=55831
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