GranuCult(R) plus Deoxycholate Hydrogen sulfide Lactose Agar

Descrição detalhada : GranuCult(R) plus Deoxycholate Hydrogen sulfide Lactose (DHL) Agar is a nutrient rich medium to detect and isolate Gram-negative bacteria, from different materials. H2S production is indicated by a blackening of the colonies due to formation of iron sulfide. Although Proteus is H2S-positive, its colonies are not black. Colonies of Proteus, Morganella, Rettgerella and Providencia are, however, surrounded by dark brown zones, which occur, because these species act on the phenylalanine of the peptone to produce phenylpyruvate, which forms an iron complex with iron(III) ions. The sucrose content of the medium permits differentiation of weakly lactose-positive or lactose-negative, sucrose-positive species from sucrose- and lactose-negative Enterobacteriaceae. The deoxycholate largely suppresses the growth of Gram-positive bacteria and prevents the swarming of Proteus species. This medium provides a rich nutrient base and contains a relatively low concentration of the inhibitor deoxycholate. These properties permit growth of even fastidious strains of Salmonella and Shigella. The colonies formed are considerably larger than those found on other selective culture media. Proteus, Morganella, Rettgerella and Providencia can be differentiated from Salmonella.Neutral Red is a pH indicator and agar is the solidifying agent. .
Armazenamento : +15°C to +25°C
Embalagem : 1X1EA