Sheep blood agar inhibits gram negative bacteria. E. coli is gram negative.
whitw to whitish gray
E. coli generally gain nutrition by absorbing materials from an agar plate or other medium. The main food source of E. coli are simple sugars.
E. coli generally gain nutrition by absorbing materials from an agar plate or other medium. The main food source of E. coli are simple sugars.
E.coli does not digest the starch on a starch agar plate, therefore it does not produce amylase making it negative.
E. coli is actually green on tryptic soy agar. The agar itself is a white, amber color.
Escherichia coli and many others
The agar medium provides a solid surface for E. coli to grow on. The nutrients in the agar, such as sugars and amino acids, provide the necessary energy and building blocks for E. coli to metabolize and replicate. Additionally, agar acts as a stabilizing agent, allowing the bacteria to form colonies and preventing them from being washed away.
For colony appearance u want to describe what it looks like on agar not under a microscope. In terms of color it depends on what type of growth medium u are using but if it's just plain nutrient agar: Pigmentation: Colorless Opacity: Translucent Form: Circular Margin: entire Surface: Smooth Elevation: Raised.
It's not easy to differentiate the pigment of p aeruginosa on pseudomonas agar P from the pigment of E. coli on MacConkey agar without referring to the colors, but it can be done based on the structure of the p aeruginosa.
The most common cause of melanosis coli is an extended use of laxatives. This condition is basically a disorder in the pigmentation of the wall of the colon.
A better way to phrase the question you are asking is "Can PEA agar grow E. coli?" The answer is yes, but only a small amount of growth will be observed because PEA is partially inhibitory to Gram negative organisms and E. coli is Gram negative.