Nh]]ï¿½CH2ï¿½CH2ï¿½CH2, hydroxyproline, phenyl alanine or phenyl-a-aminopropionic acid, C 6 H 5 ï¿½ CH 2 ï¿½ CH(NH 2) ï¿½ Cooh, tyrosine or p-hydroxyphenyl-aaminopropionic acid, phenyl ethylamine, p-hydroxyphenyl ethylamine, tryptophane or indol aminopropionic acid, A.
B-methyl indol or skatole occurs in human faeces.
For example, various sugars - lactose, glucose, saccharose, &c. - are added to test the fermentative action of the bacterium on these substances; litmus is added to show changes in reaction, specially standardized media being used for estimating such changes; peptone solution is commonly employed for testing whether or not the bacterium forms indol; sterilized milk is used as a culture medium to determine whether or not it is curdled by the growth.
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