One example of a beneficial bacteria would be nitrosomonas. Nitrosomonas is a genus comprising rod shaped chemoautotrophic bacteria. This certain bacteria oxidizes ammonia into nitrite as a metabolic process. This bacteria is useful in the treatment of industrial and sewage waste and in the process of biomediation. This bacteria is found in soil, sewage, freshwater, and on building surfaces, especially in polluted areas that contains high levels of nitrogen compounds.
http://www.google.com/imgres?imgurl=http://www.ornl.gov/sci/techresources/Human_Genome/publicat/microbial/nitrosomonas.jpg&imgrefurl=http://www.ornl.gov/hgmis/publicat/microbial/image6.html&usg=__1N84tvEbl4Y7DC_7Z8mXcnvJOOU=&h=500&w=388&sz=40&hl=en&start=0&zoom=1&tbnid=FboyjXR9HWNPKM:&tbnh=145&tbnw=113&prev=/images%3Fq%3DNitrosomonas%26um%3D1%26hl%3Den%26safe%3Dactive%26sa%3DN%26biw%3D1024%26bih%3D865%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=126&vpy=53&dur=2082&hovh=255&hovw=198&tx=99&ty=119&ei=7fOtTN7NGoa8sAPw-tXCAg&oei=7fOtTN7NGoa8sAPw-tXCAg&esq=1&page=1&ndsp=25&ved=1t:429,r:0,s:0
An example of a harmful bacteria would be something like Acinetobacter baumannii. It is a species of pathogenic bacteria and is resistant to most antibiotics. As a result of its resistance to drug treatment, some estimates state the disease is killing tens of thousands of US hospital patients each year and specialists say "they could emerge as a bigger threat." The illness can case severe pneumonia and infections of the urinary tract, bloodstream and other parts of the body.
http://en.wikipedia.org/wiki/File:Acinetobacter_baumannii.JPG
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