02114nam a2200229Ia 4500 IA_Plants belonging to the family Asteraceae have shown various biological properties that affect various organisms, from bacteria, fungi, viruses, mites and insects. Therefore, the following research is suggested in order to evaluate the antibacterial properties that has Tagetes nelsonii Greenm and mexican Artemisia ludoviciana subsp. By isolating the active substances under an extraction method and demonstrating the effect of compounds on a strain of Escherichia coli. The methods used to measure bacterial activity of extracts against the bacteria were: growth kinetics and antimicrobial susceptibility testing by disk diffusion under the Kirby Bauer method. 6 treatments with several repetitions were evaluated by experimental completely randomized design and test multiple ranges Tukey (error: 0.05) , this evidenced analysis percentage inhibition is in relation to the concentration of treatment and the effect was demonstrated antibacterial resistance E. coli extract against A. ludoviciana contrary to T. nelsonii which showed intermediate sensitivity. The discrepancy in the results could be due to the mechanism of action, the extraction technique or methodology used. Therefore this study can´t be generalized to other bacteria and other species EVALUACION IN VITRO DE LA ACTIVIDAD ANTIBACTERIANA 220117s xx 000 0 und d 186151 Disponible en PDF Artemisia ludoviciana Antibacterial properties 161364 Artemisia ludoviciana Propiedades antibacterianas 161365 Cepas Escherichia coli 161366 Strains Escherichia coli 161367 Tagetes Antibacterial properties 161368 Tagetes Propiedades antibacterianas 161369 Sandoval Castilla, Ofelia, dir. 150466 Santos Moreno, Armando, asesor 163714 Sosa Montes, Eliseo, asesor TESIS L67 2016 186151 186151