Is Bacillus subtilis methyl red positive?

The VP test for this bacteria was positive, while indole and methyl red tests were negative. Further analysis showed that these bacteria shared a homology up to 99.4% with Bacillus subtilis DQ198162.

Is B. cereus urease positive?

Physiological and Biochemical Characteristics of SW7-1. SW7-1 was aerobic and motile. It was positive for urease, catalase, oxidase, deoxidization of nitrate, and Voges−Proskauer reaction.

How is methyl red used to identify Bacillus cereus?

After incubation the indicator methyl red was added and turned a cherry red color indicating a positive reaction for acid production from glucose metabolism. After a positive Methyl Red (MR) test, the unknown possibilities were then limited to E. coli, Klebsiella pneumonia (K. pneumonia) or Proteus vulgaris (P. vulgaris).

Why was my Mr test not positive for Bacillus cereus?

These tests should have shown a positive result identifying B. cereus earlier in the testing process as the Gram positive bacterium. The probability for the inaccurate results of the oxidase test could have been that the bacterium was an older culture. In addition the MR test was probably contaminated.

What kind of bacteria is Bacillus cereus?

After several tests and experiments it was determined that Bacteria A was Pseudomonas aeruginosa and Bacteria B was Bacillus cereus. After performing the gram stain for bacteria A and determining the unknown was a gram negative rod, the organism underwent a multitude of biochemical tests to narrow down the exact bacteria.

Can a Gram negative bacillus rod be identified?

The Gram negative Bacillus rods were simpler to identify as they only had two options. The selection process was started with a methyl red test which led to the conclusion of B. cereus by producing a positive test result. To verify this result, a casein test was done which also positively identified B. cereus.