No, it is negative.
B. subtilis on EMB agar:
http://www.microbelibrary.org/microbelibrary/files/ccImages/Articleimages/Atlas_EMB/Bacillus-subtilis_EMB_fig11.jpg
Yes it is. Bacillus subtilis produces endospores?
no, it shows negative for lactose fermentation on MacConkey's agar
Citrobacter diversus is capable of fermenting lactose, therefore it would test positive for lactose fermentation in biochemical tests. This bacterium produces acid and gas during lactose fermentation, which can be detected using appropriate methods such as the MacConkey agar test.
The Kirby-Bauer antibiotic test is a general test that determines if an organism is resistant or susceptible to different antibiotics. Many different types of antibiotics can be used but some of the common ones are penicillin, tetracycline, chloramphenicol, and streptomycin.
A pH indicator is not needed in lactose broth fermentation tubes because the fermentation of lactose by bacteria produces acid as a byproduct, lowering the pH of the broth. This drop in pH can be visually observed as a color change in the medium, indicating lactose fermentation.
Yes it is. Bacillus subtilis produces endospores?
bacillus subtilis
No
Bacillus subtilis will typically produce an alkaline reaction in litmus milk, turning it pink or purple. This is due to the bacterium's ability to break down lactose and produce ammonia. Additionally, Bacillus subtilis may also cause coagulation of the milk proteins, resulting in a solid clot formation.
no, it shows negative for lactose fermentation on MacConkey's agar
Because bacillus cereus is a Gram-positive, spore-forming, and rod-shaped, it\'s only able to ferment glucose.
Citrobacter diversus is capable of fermenting lactose, therefore it would test positive for lactose fermentation in biochemical tests. This bacterium produces acid and gas during lactose fermentation, which can be detected using appropriate methods such as the MacConkey agar test.
Lactose does undergo fermentation when acted upon by lactase-fermenting microbes.
No.----------------------------------------------------------Disagree. You'll find a positive sucrose fermentation test for P. vulgaris at MicrobeLibrary.org. The site is an affiliate of the American Society of Microbiology, so I'm guessing it's a safe bet.
The Kirby-Bauer antibiotic test is a general test that determines if an organism is resistant or susceptible to different antibiotics. Many different types of antibiotics can be used but some of the common ones are penicillin, tetracycline, chloramphenicol, and streptomycin.
MacConkey agar is yellow (due to the lactose in the agar). When an organism consumes the lactose, the agar turns purple. Purple indicates a positive test. If the organism doesn't use the agar, the agar stays yellow.
If Bacillus subtilis is inoculated into litmus milk, it will likely grow and metabolize lactose, forming acid as a byproduct. This metabolism will cause the litmus milk to turn pink or purple as the pH decreases due to the production of acid. The milk may also show coagulation due to acid production.