Bacteria as Pathogens
Country: United States
Date: April 2005
Is there a relationship between the concentration of
phosphate ions in nutrient solutions and the number of cells dividing by
mitosis in root tips?
I'll give you a hint-anything an organism can do (ie, a function) is
usually as a result of protein-protein interactions, and proteins are coded
for by genes, and genes can change over time.....
By the way-it isn't necessarily true that Legionnella pneumophila hadn't
been pathogenic before that time-it just hadn't been described up until that
point. After the outbreak, many samples of tissue from people who died from
pneumonia of unknown cause were re-examined and found to be carrying this
organism. Mystery solved.
This bacterium may have never become pathogenic without the advent of
air-conditioning so it wasn't necessarily the bacterium changing by a new
ecological niche opening up for this organism.
Ron Baker, Ph.D.
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Update: June 2012