AUTHOR=Santamaría Johanna , López Liliana , Soto Carlos Y. TITLE=Detection and Diversity evaluation of tetracycline resistance genes in grassland-based production systems in Colombia, South America JOURNAL=Frontiers in Microbiology VOLUME=2 YEAR=2011 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2011.00252 DOI=10.3389/fmicb.2011.00252 ISSN=1664-302X