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What bacteria is indole negative urea positive methyl red positive hydrogen sulfide positive and lactose negative?
Wiki User
∙ 10y ago
urease negative
Wiki User
∙ 15y ago
Wiki User
∙ 10y agoproteus mirabilis
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What is negative lactose fermentative organisms?
these are those bacteria which are not able to ferment lactose sugar hence are called non lactose fermenting or negative lactose fermenting organisms.
Is Pseudomonas luteola oxidase positive?
in the absence of glucose or lactose , some bacteria are able to use citrate as only source of carcon. alkaline pH change the bromothymol blue indicator from green to blue. pseudomonas can not ferment the glucose and the lactose so it use the citrate as carbon source.
Why is lactose fermentation common among enteric gram negative bacteria?
Probably because that is where the gram negative bacteria have found a food source. Lactose is not the perfered diet, but it works and they are most likely there because they can tolerate the environment, and survive (on lactose) when their #1 food source is not available.
Does providencia bacteria ferment lactose?
No, it doesn't. After performing the Lactose fermentation test, the isolated colonies will turn yellow meaning that the test was negative.
Why are some organisms positive in the ONPG Test but negative when tested for the ability to metabolize lactose?
ONPG is for the detection of delayed lactose fermentation.
Which bacteria is amylase positive catalase positive cysteine desulhydrase negative nitrate reduction negative glucose positive lactose positive sucrose positive citrate positive?
bacillus subtilis
The positive control of the lactose operon in bacteria is what?
Catabolite repression is the positive control of the lactose operon in bacteria. Glucose is metabolized initially and when depleted, the lactose.
What is negative lactose fermentative organisms?
these are those bacteria which are not able to ferment lactose sugar hence are called non lactose fermenting or negative lactose fermenting organisms.
Is Pseudomonas luteola oxidase positive?
in the absence of glucose or lactose , some bacteria are able to use citrate as only source of carcon. alkaline pH change the bromothymol blue indicator from green to blue. pseudomonas can not ferment the glucose and the lactose so it use the citrate as carbon source.
What is macconkey agar made out of?
Macconkey agar consists of agar, lactose, peptone, neutral red dye, crystal violet dye & bile salts. Bile salts inhibit growth of Gram positive bacteria & allow growth of Gram negative bacteria only. It differentiates lactose fermentating Gram negative bacteria from non lactose fermentating Gram negative bacteria.
Why is lactose fermentation common among enteric gram negative bacteria?
Probably because that is where the gram negative bacteria have found a food source. Lactose is not the perfered diet, but it works and they are most likely there because they can tolerate the environment, and survive (on lactose) when their #1 food source is not available.
Does providencia bacteria ferment lactose?
No, it doesn't. After performing the Lactose fermentation test, the isolated colonies will turn yellow meaning that the test was negative.
Why are some organisms positive in the ONPG Test but negative when tested for the ability to metabolize lactose?
ONPG is for the detection of delayed lactose fermentation.
Is emb a defined medium?
EMB is an undefined selective/differential medium. It contains aniline dyes (methylene blue and eosin), which inhibit the growth of Gram-positive bacteria selecting for Gram-negative bacteria. EMB also contains lactose which makes the media differential based on an organisms ability to ferment lactose.
EMB is a selective medium Is it also a defined or an undefined medium Why is that formulation desirable?
EMB is an undefined selective/differential medium. It contains aniline dyes (methylene blue and eosin), which inhibit the growth of Gram-positive bacteria selecting for Gram-negative bacteria. EMB also contains lactose which makes the media differential based on an organisms ability to ferment lactose
Is bacillus subtilis positive for glucose fermentation?
B. subtilis does not ferment glucose nor lactose
What ingredients in fresh milk is eventually devoured by bacteria causing the sour taste?
Lactose is eventually devoured by bacteria.
