
Nalidixic acid (tradenames Nevigramon, Neggram, Wintomylon and WIN 18,320) is the first of the synthetic quinolone antibiotics. In the technical sense, it is a naphthyridone, not a quinolone: its ring structure is a 1,8-naphthyridine nucleus that contains two nitrogen atoms, unlike quinoline, which has a single nitrogen atom. Synthetic quinolone a...
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http://en.wikipedia.org/wiki/Nalidixic_acid

(from the article `drug`) The fluoroquinolone antibiotics (e.g., norfloxacin, ciprofloxacin, enoxacin, trovafloxacin) are synthetic compounds based on the chemical structure ...
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<drug> Synthetic antibiotic that interferes with DNA gyrase and inhibits prokaryotic replication. Often used in selective media. ... (18 Nov 1997) ...
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(nal″ĭ-dik´sik) a quinolone antibacterial agent, active against most gram-negative bacteria causing urinary tract infection including Escherichia coli, Klebsiella and Enterobacter species, and some Proteus species. Pseudomonas species are generally resistant.
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Synthetic antibiotic that interferes with DNA gyrase and inhibits prokaryotic replication. Often used in selective media.
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Type: Term Pronunciation: nal-i-dik′sik as′id Definitions: 1. An orally effective antibacterial agent used in the treatment of genitourinary tract infections.
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http://www.medilexicon.com/medicaldictionary.php?t=58746

[
n] - antibacterial agent used especially to treat genitourinary infections
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http://www.webdictionary.co.uk/definition.php?query=nalidixic%20acid

member of the quinolone family that functions by inhibiting the activity of DNA gyrase, blocking DNA replication
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
NegGram noun antibacterial agent used especially to treat genitourinary infections
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https://www.encyclo.co.uk/local/20974

a substance, CHNO, that has antibacterial activity against many susceptible Gram-negative organisms, esp. used in the treatment of urinary tract infections.
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https://www.infoplease.com/dictionary/nalidixic-acid
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