Knapp CW, Dodds WK, Wilson KC, O’Brien JM, Graham DW. (May 2009) Spatial Heterogeneity of Denitrification Genes in a Highly Homogenous Urban Stream. Environmental Science & Technology, 43(12):4273-4279.  

De La Rosa D, Lima L, Olivares-Rieumont S, Graham DW, Enriquez I, Diaz O, Bastías JM, Muñoz O. (January 2009) Assessment of Total Mercury Levels in Clarias gariepinus from the Sagua la Grande River, Cuba. Bulletin of Environmental Contamination and Toxicology, 82(1): 101-105.  

Zhang W, Sturm BSM, Knapp CW, Graham DW. (2009) Accumulation of Tetracycline Resistance Genes in Aquatic Biofilms Due to Periodic Waste Loadings from Swine Lagoons. Environmental Science & Technology, 43(20):7643-7650.   


Olivares-Rieumont S, Lima L, De la Rosa D, Graham DW, Columbie I, Santana JL, Sánchez MJ. (December 2008) Water Hyacinths (Eichhornia crassipes) as Indicators of Heavy Metal Impact of a Large Landfill on the Almendares River near Havana, Cuba. Bulletin of Environmental Contamination and Toxicology, 79(6):583-587.   

Knapp CW, Findlay DL, Kidd KA, Graham DW. (October 2008) A comparative assessment of molecular biological and direct microscopic techniques for assessing aquatic systems. Environmental Monitoring and Assessment, 145(1-3):465-473.  

Knapp CW, Engemann CA, Hanson ML, Keen PL, Hall KJ, Graham DW. (June 2008) Indirect Evidence of Transposon-Mediated Selection of Antibiotic Resistance Genes in Aquatic Systems at Low-Level Oxytetracycline Exposures. Environmental Science & Technology, 42(14):5348-5353.  

Engemann CA, Keen PL, Knapp CW, Hall KJ, Graham DW. (June 2008) Fate of Tetracycline Resistance Genes in Aquatic Systems: Migration from the Water Column to Peripheral Biofilms. Environmental Science & Technology, 42(14):5131-5136.  


Knapp CW, Graham DW. (September 2007) Nitrite-oxidizing bacteria guild ecology associated with nitrification failure in a continuous-flow reactor. FEMS Microbiology Ecology, 62(2):195-201.  

Graham DW, Knapp CW, Van Vleck ES, Bloor K, Lane TB, Graham CE. (July 2007) Experimental demonstration of chaotic instability in biological nitrification. The ISME Journal, 1(5):385-393.  

Knapp CW, Fowle DA, Kulczycki E, Roberts JA, Graham DW. (July 2007) Methane monooxygenase gene expression mediated by methanobactin in the presence of mineral copper sources. Proceedings of the National Academy of Sciences, 104(29):12040-12045.  

Peak N, Knapp CW, Yang RK, Hanfelt MM, Smith MS, Aga DS, Graham DW. (January 2007) Abundance of six tetracycline resistance genes in wastewater lagoons at cattle feedlots with different antibiotic use strategies. Environmental Microbiology, 9(1):143-51. doi: 10.1111/j.1462-2920.2006.01123.x.