10.22376/ijpbs.2019.10.1.p1-12 Volume 3 Issue 4 2012(October - December) The antimicrobial activity of essential oil and different solvent extract of seed of lessThan i greaterThan Trachyspermum ammi lessThan /i greaterThan were assayed in vitro by agar disc diffusion against bacterial species. Hydrodistillation of seeds of lessThan i greaterThan Trachyspermum ammi lessThan /i greaterThan using clevenger apparatus was carried out. Extraction of seeds of lessThan i greaterThan Trachyspermum ammi lessThan /i greaterThan with different solvents (Petroleum ether, Benzene, chloroform & Methanol), were also carried out in order of their increasing polarity. Antimicrobial activity of essential oil and solvent extracts of lessThan i greaterThan Trachyspermum ammi lessThan /i greaterThan were done using lessThan i greaterThan Salmonella typhi, Escherichia coli, Lactobacillus & Bacillus lichenifomis lessThan /i greaterThan . The results showed lessThan i greaterThan lessThan /i greaterThan that the essential oil showed better antimicrobial activity in comparison to extracts. Among the different solvent extracts, chloroform extract showed more antimicrobial activity in comparison to the other extract. Methanol extract did not show any antimicrobial activity. COMPARATIVE AND QUANTITATIVE DETERMINATION OF QUERCETIN AND OTHER FLAVONOIDS IN NORTH INDIAN POPULATIONS OF TRIBULUS TERRESTRIS LINN,BY HPLC aromatic herbs, pathogen, solvent extracts, clevenger apparatus 64-68