The most important types of food circles Media and characteristics

1- Chocolate Agar:

• Enriched Media-rich environment to grow the most bacteria

• containing factors X and V resulting from the explosion of red blood cells RBCs and which they can Heamophilus spp and Neisseriae which is these types of bacteria growth difficult Fastidious growth.

Chocolate Agar

2- Blood Agar:

• Enriched Media-rich environment to grow the most bacteria

• Differential environment differential between the types of bacteria, an analyst for the blood through the complete decomposition of the blood, such as Beta hemolytic Sterpt. Pyogenes and Sterpt. Agalactiae or partial decomposition of the blood, such as Alpha hemolytic like Sterpt. Pneumonia and Sterpt. Viridans or no decomposition of the blood, such as Non hemolytic Sterpt. Faecalis and Sterpt. Bovis.

Blood Agar

3- MacConkey Agar:

• differential environment to differentiate between bacteria fermented lactose Lactose fermenting and that takes a red color such as E.coli and Klebsiella and Enterobacter, and between non-fermented bacteria lactose Non-lactose fermenting and that have no color (transparent), such as Proteus and Salmonella and Shigella.

• contain Crystal violet or Bile Salts to allow for negative bacteria Gram growth and inhibit Gram Positive growth

MacConkey Agar

4- (stine Lactose electrolyte deficient (CLED:

• the center for the cultivation of urinary tract samples.

• differential environment to differentiate between bacteria fermented lactose Lactose fermenting which takes yellow color, such as E.coli, and between non-fermented bacteria lactose Non-lactose fermenting and that have no color (transparent) like Acnitobacter because of the presence detector Bromo-thymol blue.

• have the same function of MacConkey Agar

(stine Lactose electrolyte deficient (CLED

(Stine Lactose electrolyte deficient (CLED

5- (Xylose lysine deoxycholate (XLD:

• differential optional environment for Salmonella and Shigella as Salmonella take the pink color to the presence of Phenol Red with a black color in the center as a result of the decomposition of materials found in the environment resulting H2S gas and the Shigella take colonies pink color only.

(Xylose lysine deoxycholate (XLD

6- Salmonella Agar (S.S Agar) Shigella:

• optional environment that does not allow the growth of bacteria, Gram Positive and some negative bacteria, gram, except for Salmonella Shigella & due to the presence of Na-citrate & bile salts

• differential environment for Salmonella and Shigella as Salmonella take the environment color (transparent) with a black color in the center as a result of the decomposition of materials found in the environment resulting H2S gas and the Shigella colonies take center-color (transparent).