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In my result i isolate bacillus sp on mannitol salt agar but i expect that this media has deoration or expaired
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∙ 12y ago
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Does micrococcus roseus test positive for mixed acid fermentation?
Micrococcus roseus ferments sucrose, but no gas. Does not ferment lactose, glucose, or mannitol. Beta hemolitic. Catalase positive. Pink colonies of groth
What is mannitol salt test for and whats a positive test result?
The mannitol salt test is used to identify Staphylococcus aureus. A positive test result is indicated by the presence of yellow colonies, which indicates that the organism is able to ferment mannitol and lower the pH of the media turning it yellow.
Is Staphylococcus aureus lactose frementing bacteria?
Yes, it can ferment lactose. Mannitol Salt Agar is used to identify S.aureus. When it ferments D-mannitol, it produces an acid which turns the agar yellow from red. S.epidermidis will grow, but the agar remains red.
Where do you find bacillus coagulans?
Bacillus coagulans is a lactic acid forming bacterial species within the genus Bacillus.
Why is lactic acid in milk?
Bacteria get into the milk and ferment it for energy. One of the products of this process is lactic acid.
Does bacillus megaterium ferment glucose?
Yes, acid is produced but gas is not.
How do bacteria help in synthesis of vitamins?
Bacteria which live on the walls of the intestine help in the production of vitamins. Bacillus valgatus is a bacteria is capable of producing thiamine from lactic acid. Bacillus subtilis and escherichia coli are capable of producing riboflavin and pyridoxine.
How can microrganisms help in production of vitamins?
Bacteria which live on the walls of the intestine help in the production of vitamins. Bacillus valgatus is a bacteria is capable of producing thiamine from lactic acid. Bacillus subtilis and escherichia coli are capable of producing riboflavin and pyridoxine.
What type of bacteria is typhoid causing bacteria?
The are gram negative bacillus shaped bacteria. They are facultative anaerobic bacteria. They ferment the glucose to produce acid and gas. They ferment the sulfur containing amino acids to produce H2S gas. They do not ferment the lactose.
What microorganism can grow on a malt agar?
Bacillus subtilis E. coli Pseudomons fluorenscens streptococcus faecilis most bacteria can grow on nutrient agar
Does micrococcus roseus test positive for mixed acid fermentation?
Micrococcus roseus ferments sucrose, but no gas. Does not ferment lactose, glucose, or mannitol. Beta hemolitic. Catalase positive. Pink colonies of groth
What is the bacteria mophology for bacillus subtilis by simple stain?
B. subtilis is indeed a Gram positive rod.However, there is confusion as to whether it is an obligate aerobe or a facultative anaerobe. Although classed as an obligate aerobe, it has been shown to grow under strict anaerobic conditions.
Is Staphylococcus aureus lactose frementing bacteria?
Yes, it can ferment lactose. Mannitol Salt Agar is used to identify S.aureus. When it ferments D-mannitol, it produces an acid which turns the agar yellow from red. S.epidermidis will grow, but the agar remains red.
What is mannitol salt test for and whats a positive test result?
The mannitol salt test is used to identify Staphylococcus aureus. A positive test result is indicated by the presence of yellow colonies, which indicates that the organism is able to ferment mannitol and lower the pH of the media turning it yellow.
Why is mannitol salt considered to be a differential media?
Mannitol salt agar is used for the isolation of staphylococci which is found normally on skin (S. aureus). The selectivity is obtained by the high salt concentration that inhibits growth of many groups of bacteria.
What is the color of methyl red in boric acid and mannitol?
Methyl red will appear yellow in a boric acid solution and red in a mannitol solution.
What the purpose of mannitol salt?
The purpose is to select for salt-tolerant microbes. Most species of microbes can't grow in such a salty environment. The only genus that can culture on an MSA plate is Staphylococcus. The only species of Staphylococcus that can ferment Mannitol is Staph. Aureus. If the plate turns yellow, you know that Mannitol was fermented into an acid, which only Staph. Aureus can do. If there is a little growth (aka the culture is red) then it's still most likely a species of Staph such as Staph. epidermidis. If there is no growth, as in E. coli, then there will be no culture and no change in color.
