1) The document discusses isolating and characterizing bacteriophages from sewage samples using transmission electron microscopy. 2) The author was able to visualize bacteriophages that were specific for E. coli O157:H7 and Citrobacter freundii under the transmission electron microscope. 3) This confirmed that phages were present in the sewage plant samples and that transmission electron microscopy is an effective method for visualizing bacteriophages.