In this video, Dr. Finlay is demonstrating how Salmonella (a common bacteria associated with food poisoning) invades a cell by using a marble, plastic wrap, and some yellow gelatin. The marble represented the Salmonella bacterium, the plastic wrap represented the cell membrane and the yellow gelatin represented the cytoplasm of the cell. Dr. Finlay had a volunteer to help represent how Salmonella will infect a cell by pushing through the cell membrane and getting inside the cytoplasm.
Salmonella is a gram negative bacterium which we learned in class that the bacterial cell wall structure consists of two phospholipid layers, a peptidoglycan layer and LPS. When we perform a Gram stain the cell will appear to be pink.
http://www.hhmi.org/biointeractive/media/jello_salmonella-lg.mov
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