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What else can I help you with?
Why does Pepto-Bismol turn black when you mix it with contaminated water?
Pepto-Bismol is made with bismuth subsalicylate, which can react with sulfur compounds present in contaminated water to form bismuth sulfide. This chemical reaction causes the mixture to turn black.
Why is typhoid caused by drinking unhygienic water?
Typhoid fever is caused by bacteria present in contaminated water. Water is contaminated by exposure to feces of effected person . It is common in poor countries with little hygienic care and poor sanitary conditions .It effects intestine hence called enteric fever .
What is the purpose of negative staining experiment?
Answer by NO.1GreatThinker :- The basic purpose of the negative staining experiment is to check out the bacteria / micro-organisms which have less amount of peptidoglycans present in their cell wall So experiment can be performed to distinguish gram negative bacteria from gram positive one . It is performed by using a dye nigrosin which is a negatively charged dye in nature . So it is first taken on a slide ( just a drop of it ) . Then specimen of the bacteria is taken from the culture . It is placed over the dye . Now since bacteria is also negatively charged . So there is repulsion in both dye and the bacteria . Hence the bacteria seems or appears in between the dye as bright light spots . It is observed under the light microscope . Hence the experiment .
Can colony morphology help to determine the identity of bacteria?
to know the amount of bacteria present
Which type of bacteria are present in curd either gram plus ve or gram -ve bacteria?
The bacteria present in curd are primarily Gram-positive bacteria. These include species like Lactobacillus acidophilus and Streptococcus thermophilus. Gram-negative bacteria are not typically found in curd as the fermentation process favors the growth of Gram-positive bacteria.
What are medically important bacteria often grown on?
The only culture medium I know are called petri dishes. The bottom is coated with a media that encourages growth, if any bacteria are present in the specimen. The petri dish remains covered/closed and placed in an area that incubates the specimen. IF bacteria are present, it will grow and multiply into colonies often big enough to see with the naked eye, i.e. without a microscope.
Why are blood cultures drawn from two different sites?
If one produces bacteria and the other doesn't, it's safe to assume that the bacteria in the first culture is contaminated, most likely with skin bacteria, and not the infecting agent. When both cultures grown the infecting agent, bacteremia is present.
Why does Pepto-Bismol turn black when you mix it with contaminated water?
Pepto-Bismol is made with bismuth subsalicylate, which can react with sulfur compounds present in contaminated water to form bismuth sulfide. This chemical reaction causes the mixture to turn black.
What happens if bacteria is present in mouth?
Bacteria is always present in the mouth.
Why is typhoid caused by drinking unhygienic water?
Typhoid fever is caused by bacteria present in contaminated water. Water is contaminated by exposure to feces of effected person . It is common in poor countries with little hygienic care and poor sanitary conditions .It effects intestine hence called enteric fever .
Will contaminated food always have the same signs?
No. Food can be contaminated with a variety of adulterants - most of which show no signs at all that they are present.
What cause bacteria in your household?
Bacteria are present EVERYWHERE
How many good bacteria are present in the human body?
There are trillions of good bacteria present in the human body.
How can you tell a specimen is a eukaryote?
By observing its organells. If a nucleus or membranous organelle present
What is the minimum number of bacteria present on one of your plates?
The minimum number of bacteria present on a plate is 1. Depending on how well the bacterial colony was isolated, there may be different kinds of bacteria present.
How soon must a urine specimen reach the laboratory?
How soon a specimen of something must reach the laboratory depends partly on the reason for which it is being sent to the laboratory, environmental conditions during storage and transit, and the stability of the substances the specimen consists of. A urine specimen must be refrigerated during storage and transit and arrive in the lab within an hour or two. It cannot sit out because warmth will allow bacteria, if present, to begin to grow in numbers.
What is the purpose of negative staining experiment?
Answer by NO.1GreatThinker :- The basic purpose of the negative staining experiment is to check out the bacteria / micro-organisms which have less amount of peptidoglycans present in their cell wall So experiment can be performed to distinguish gram negative bacteria from gram positive one . It is performed by using a dye nigrosin which is a negatively charged dye in nature . So it is first taken on a slide ( just a drop of it ) . Then specimen of the bacteria is taken from the culture . It is placed over the dye . Now since bacteria is also negatively charged . So there is repulsion in both dye and the bacteria . Hence the bacteria seems or appears in between the dye as bright light spots . It is observed under the light microscope . Hence the experiment .
