There are many ways of classifying bacteria. One method is based on the cell membrane. In 1884, a bacteriologist named Christian Gram created a test that could determine if a bacterium had a thick, ...
The Journal of Infectious Diseases, Vol. 21, No. 2 (Aug., 1917), pp. 145-153 (9 pages) To isolate typhoid bacilli from urine not collected under aseptic precautions, streak 2 or 3 large loops of the ...
Gram staining is one way scientists can identify bacteria. Gram-positive bacteria, such as Staphylococcus, appear blue or purple under a microscope when scientists apply a stain. Conversely, ...
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