- What is the acceptable level of coliform bacteria per 100 mL of drinking water?
- What does a positive coliform test indicate?
- What temperature is best for digestion with EcoRI and why?
- Why agar plates are incubated upside down?
- What was the purpose of the 24 hour incubation period would you expect?
- What is the purpose of incubating unopened plates?
- Why do we incubate at 37 degrees Celsius?
- Why are cultures collected from the human body usually incubated at 35 to 37 C?
- Why is it important to invert plates when incubating at 37?
- At what pH and temp The enzymes are highly efficient?
- What temperature is best for incubating bacteria?
- What happens to bacteria at 37 degrees?
- What is the difference between total coliform and E coli?
- Do all enzymes work best at 37 degrees?
- What happens if you incubate bacteria too long?
- Why are the coliform plates incubated at 37 C?
- Why do enzymes work best at 37 degrees?
- Why does bacteria grow better in warm temperatures?
What is the acceptable level of coliform bacteria per 100 mL of drinking water?
Maximum Acceptable Concentration for Drinking Water = none detectable per 100 mL This means that in order to conform to the guideline: For every 100 mL of drinking water tested, no total coliforms or E.coli should be detected..
What does a positive coliform test indicate?
A positive coliform test means possible contamination and a risk of waterborne disease. A positive test for total coliforms always requires more tests for fecal coliforms or E. coli. A confirmed positive test for fecal coliforms or E.
What temperature is best for digestion with EcoRI and why?
Thermo Scientific EcoRI restriction enzyme recognizes G^AATTC sites and cuts best at 37°C in its own unique buffer. See Reaction Conditions for Restriction Enzymes for a table of enzyme activity, conditions for double digestion, and heat inactivation for this and other restriction enzymes.
Why agar plates are incubated upside down?
Petri dishes need to be incubated upside-down to lessen contamination risks from airborne particles landing on them and to prevent the accumulation of water condensation that could disturb or compromise a culture.
What was the purpose of the 24 hour incubation period would you expect?
The purpose of the 24-hour incubation would be so that we can see how they reproduce and grow. We wouldn’t be able to see how much the cells morphed if the cultures weren’t incubated. In the graph it shows the process of the yeast reproducing with incubation .
What is the purpose of incubating unopened plates?
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Why do we incubate at 37 degrees Celsius?
Optimal Growth Conditions Different bacteria like to grow at different temperatures. … By changing the temperature, he can study the bacteria while they are stressed. Organisms that grow best at human body temperature, which is approximately 37 degrees Celsius (98.6 degrees Fahrenheit), are called mesophiles.
Why are cultures collected from the human body usually incubated at 35 to 37 C?
At 35°C, most human bacterial pathogens with differing optimum growth temperature will grow reliably, although colonies may appear small or require additional incubation due to their slower growth rate. … Incubation at 37°C also risks fluctuations to dying off temperatures.
Why is it important to invert plates when incubating at 37?
Petri dishes having media are incubated in inverted position after inoculation. … When the plates are incubated in the normal position, water evaporation from media occurs. These vapors condense on the lid of the Petri dish and drops fall on the colonies developed on the media surface.
At what pH and temp The enzymes are highly efficient?
Acids have a pH of less than 7, bases (alkalis) have a pH greater than 7. Enzymes in the stomach, such as pepsin ( which digests protein ), work best in very acid conditions ( pH 1 – 2 ), but most enzymes in the body work best close to pH 7.
What temperature is best for incubating bacteria?
Bacteria known as mesophiles, which include most pathogens and common environmental bacteria, grow best in temperatures ranging from 20 to 40 degrees Celsius (68 to 104 degrees Fahrenheit). Mesophiles are generally killed by temperatures much hotter or colder.
What happens to bacteria at 37 degrees?
Under the proper conditions (usually 37 degrees Celsius), the bacteria will consume the agar as food and grow into colonies called colony forming units (CFU’s).
What is the difference between total coliform and E coli?
Total coliform is a large collection of different kinds of bacteria. Fecal coliform are types of total coliform that exist in feces. E. coli is a subgroup of fecal coliform.
Do all enzymes work best at 37 degrees?
The optimum temperature for most enzymes is about 98.6 degrees Fahrenheit (37 degrees Celsius). There are also enzymes that work well at lower and higher temperatures. … However, enzymes are still proteins, and like all proteins, they begin to break down at temperatures above 104 degrees Fahrenheit.
What happens if you incubate bacteria too long?
If a bacterial culture is left in the same media for too long, the cells use up the available nutrients, excrete toxic metabolites, and eventually the entire population will die. Thus bacterial cultures must be periodically transferred, or subcultured, to new media to keep the bacterial population growing.
Why are the coliform plates incubated at 37 C?
Why were some agar plates incubated at 37 degrees C and others at room temperature? The plates incubated at 37 degrees C were inoculated with organisms isolated from the body that would be expected to grow bast at body temperature. … Inverted plates tend to absorb condensation moisture into the agar.
Why do enzymes work best at 37 degrees?
Most enzyme functions are performed at 37∘C in humans because the enzymes are able to retain its structure at that temperature, allowing it to break down complex molecules efficiently.
Why does bacteria grow better in warm temperatures?
Yet bacteria thrive for warmth because their enzymes function most efficiently between an optimum temperature and their growth rate is increased considerably in this temperature range. At very low temperatures the action of bacterial enzymes are inhibited and so they cannot grow further while they still survive .