Peptone metabolism by " Shigella " and " Salmonella " alkalises the medium, turning a pH indicator blue.
22.
The nutrient has been prepared in order to counter the discomfort of using materials such as peptone, beef extract, and yeast extract.
23.
It could not use most substrates tested as a sole carbon source but could use peptone, casamino acids or yeast extract as sole carbon sources.
24.
Since most bacteria can use the sugars in preference to peptone, these " uninteresting " bacteria acidify the medium and turn a pH indicator yellow or red.
25.
Proteose peptone, horse plasma, haemoglobin provide nutrients for the growth of " N . gonorrhoeae " and " N . meningitidis ".
26.
Peptones were used by British bacteriologists in nutrient media for growing " Salmonella typhi " as part of the programme for preparing vaccines against typhoid fever.
27.
The presence of ferrous sulfide as a visible black precipitate in the growth medium peptone iron agar can be used to distinguish between microorganisms that produce the ferric citrate.
28.
Non-pathogenic strains of E . coli ferment sorbitol to produce acid : Pathogenic E . coli cannot ferment sorbitol, so this strain uses peptone to grow.
29.
On peptone yeast extract agar ( PYE ) under 25-35 �C, colonies are yellow, dense and filamentous with a purplish brown centre and white periphery.
30.
In this recipe, the chick pea replaces peptone; for a protein source, green gram replaces beef extract; for another protein source, carrot replaces yeast extract.
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