blue/positive
The result is the initial green color of the Simmons Citrate Agar turning blue; generating a positive indication that the organism does indeed utilize citrate as the sole source of carbon and energy.
yes it have positive reaction for ONPG test
Bacillus subtillus will test positive when performing a VP and Citrate test. Also, bacillus cereus is much more motile. It isn't as dependable as the chemical tests, but the cereus colonies will appear wispy and more widespread on an agar plate than those of subtilis.
casein hydrolysis
No, Serratia and Klebsiella test positive for citrate. E.Coli tests negative.
It is NEGATIVE
H2S (hydrogen sulfide) Test: This test is used to check for Enteric gram negative bacilli by checking for the enzyme thiosulfate reductase which is produced by various intestinal microorganisms. So if bacillus subtilis can produce this enzyme then this test will give you a pos. (black in color) result. Yeah, no kidding. I'm pretty sure the question was what the result of it, or they wouldn't specify that it was b. subtilis. and it is positive for H2S production.
The result is the initial green color of the Simmons Citrate Agar turning blue; generating a positive indication that the organism does indeed utilize citrate as the sole source of carbon and energy.
yes it have positive reaction for ONPG test
The B.cereus has a positive citrate test and a negative Voges Proskauer.
No, it is negative.B. subtilis on EMB agar:http://www.microbelibrary.org/microbelibrary/files/ccImages/Articleimages/Atlas_EMB/Bacillus-subtilis_EMB_fig11.jpg
Bacillus subtillus will test positive when performing a VP and Citrate test. Also, bacillus cereus is much more motile. It isn't as dependable as the chemical tests, but the cereus colonies will appear wispy and more widespread on an agar plate than those of subtilis.
citrate result is positive in case of pseudomonas aeroginosa. slant and butt both will be positive
casein hydrolysis
bacillus megatarium test positive for sucrose where creus doesnt
Staphylococcus Epidermidis does return a gram positive result on the citrate lab test. Gram stains will produce these results on slides.
Based on my own test, Shigella flexneri tests negative for the citrate test.