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An MSA plate with Micrococcus sp. (1), Staphylococcus epidermidis (2) and S. aureus colonies (3). Mannitol salt agar or MSA is a commonly used selective and differential growth medium in microbiology. It encourages the growth of a group of certain bacteria while inhibiting the growth of others. [1]
A 2' x 4' petri plate filled with 14L (liters) of seaweed derived agar medium created by Harvard scientists that was used to see how E. coli evolved to be resistant to antibiotics. The mega plate also helped study more unique concepts of microbiology such as parallel evolution, mutation selection, colonial interference etc. [13]
The organism on the right produced no color, so it does not appear to be a lactose fermenter. MacConkey agar is a selective and differential culture medium for bacteria . It is designed to selectively isolate gram-negative and enteric (normally found in the intestinal tract) bacteria and differentiate them based on lactose fermentation . [ 1 ]
E. coli is the type species of the genus (Escherichia) and in turn Escherichia is the type genus of the family Enterobacteriaceae, where the family name does not stem from the genus Enterobacter + "i" (sic.) + "aceae", but from "enterobacterium" + "aceae" (enterobacterium being not a genus, but an alternative trivial name to enteric bacterium).
Referred to as E. coli O157:H7 or Shiga toxin-producing E. coli (STEC), this strain of E. coli can be particularly dangerous and even life-threatening. The primary sources of STEC outbreaks are ...
Micrococcus is a genus of bacteria in the Micrococcaceae family. Micrococcus occurs in a wide range of environments, including water, dust, and soil. Micrococci have Gram-positive spherical cells ranging from about 0.5 to 3 micrometers in diameter and typically appear in tetrads.
Non-pathogenic strains of E. coli ferment sorbitol to produce acid: Pathogenic E. coli cannot ferment sorbitol, so this strain uses peptone to grow. This raises the pH of the medium, allowing the pathogenic strain to be differentiated from other non-pathogenic E.coli strains through the action of the pH indicator in the medium.
In an experiment involving sealed bottles and some very hardy microbes, scientists at MIT discovered that both yeast and E. coli can grow in an environment with an atmosphere composed purely of ...