The acid reaction with the ore's sulfide matrix encourages the growth of the bacterial strains " A . thiooxidans " and " Acidiothiobacillus ferrooxidans, " which degrade the ore and releases the metal or mineral deposits in a fluid solution.
12.
A bacterium that is a non-lactose fermenter and ferments glucose, initially causes a yellow slant / yellow bottom ( acid / acid reaction ) after 8 hours but then converts to a red slant / yellow bottom after 24 hours ( alkali / acid reaction ).
13.
Blackening of the bottom due to H 2 S production may mask the acid reaction ( yellow ) in the bottom of the tube . " Salmonella enterica " serovar Typhi may result in blackening of the medium at the interface of bottom and the slant.
14.
A bacterium that is a non-lactose fermenter and ferments glucose, initially causes a yellow slant / yellow bottom ( acid / acid reaction ) after 8 hours but then converts to a red slant / yellow bottom after 24 hours ( alkali / acid reaction ).
