How do you calculate population of bacteria?

Answers

Answer 1

By multiplying the amount of specimen given to liquid agar by the dilution factor, multiplied by the number of colonies, you can determine how many bacteria (CFU) are present in each milliliter or gram of sample.

What is the calculation method for bacterial growth?

A bacterial culture's exponential growth rate is expressed as generation time, which is also the bacterial population's doubling time.

How can the bacterial population in a food sample be identified?

The plate approach, which involves placing a food sample on a culture medium plate, is a quicker and more precise way to calculate the number of microbes present. You can count how many colonies have grown on the culture media plate once the proper amount of incubation time has passed.

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Related Questions

The Go' for the reaction Citrate  Isocitrate is +6.64 kJmol-1 . The Go' for the reaction Isocitrate  α-Ketoglutarate is -267 kJmol-1 . Calculate the Go' for the conversion of citrate to α-ketoglutarate?

Answers

Answer:

ΔG°' for the conversion of citrate to α-ketoglutarate = - 273.64  kJmol-1

Explanation:

ΔG°' for Citrate is +6.64 kJmol-1

ΔG°' for Isocitrate is -267 kJmol-1

ΔG°' for the conversion of citrate to α-ketoglutarate = ΔG°' for product - ΔG°' for reactant

ΔG°' for the conversion of citrate to α-ketoglutarate = -267 kJmol-1 - (+6.64 kJmol-1)

ΔG°' for the conversion of citrate to α-ketoglutarate = - 273.64  kJmol-1

Which description explains why there are two high and two low tides in a day? (4 points)

Earth moves closer to the sun and moon twice a day.

Earth revolves around the tidal bulges created by gravitational forces.

Earth rotates in and out of a tidal bulge twice a day.

The moon's gravity increases over the oceans and decreases over the land.

Answers

Answer:

Earth rotates in and out of a tidal bulge twice a day.

Earth always has two surrounding gravitational forces, one proceeding from the moon and one from the sun.

The sun's pull, despite the fact our sun is further then the moon, is stronger and creates the high tide, and the moon the low tide. But as we know our earth moves, now exposing the other side to the sun which in turn leaves the other side of earth with the high tides and the other with the low tides. Tides never move, what moves is earth.

Hope it helped!

What is magma made of???

Answers

Answer:

Water vapor, Carbon dioxide, and sulfur

Explanation:

Hope that helps

Answer:

Magma made of Water vapor, carbon dioxide, and sulfur.

Explanation:

Like solid rock, Magma is a mixture of minerals. The high temperatures and pressure under Earth's crust keep magma in its fluid state.

Which statement best describes how a major change in the size of one population affects an ecosystem?

a. It will immediately kill every population and the physical conditions.
b. It would not affect the physical conditions nor any populations.
c. It will affect the physical conditions, but not the other populations.
d. It affects every population, not the physical conditions.

Answers

  this a simple question over worded to increase error

A. is obviusly no it

B. is saying nothing will happen which is incorrect

C. is saying like trees would shrink or weather would be bad

D. is correct because if there is more a certain creature it will over eat its prey

what is wrong with this statement?: sperm and egg cells go through mitosis and divide a total of 1 time

Answers

The wrong part is a total of one :)

The human circulatory system is a double circulatory system.
Some animals such as fish have a single circulatory system.
In both systems, blood is transported in arteries and veins

State the main function of arteries

Answers

Arteries carry blood away from the heart

What can be done to fight deforestation? Choose ALL that apply. There are multiple answers here.

a
Demand forest products from sustainable sources
b
Reduce use of products made from wood fiber including paper and cardboard
c
Leave forests standing and plant more trees
d
strengthen plans in communities to remove large and small native trees

Answers

Answer:

A b and c

Explanation:



9. Which diagram in Figure 1.19 represents single type of a human tissue?
(3) Kidney
(4) Digestive System
(1)Neuron
(2) Muscle

Answers

Answer: kidney

Explanation:

HELP! VERY EASY!! GIVING BRAINLIEST!!! 15 POINTS HURRY!!

Answers

Answer:

c is the correct answer

Explanation:

How do mitosis and meiosis differ? a. During mitosis and cell division, a body cell and its nucleus divide once and produce two different cells. b. During mitosis and cell division, a body cell and its nucleus divide once and produce two identical cells. c. During meiosis and cell division, a body cell and its nucleus divide once and produce two identical cells. d. During meiosis and cell division, a body cell and its nucleus divide once and produce two different cells.

Answers

Step - by - step - explaining

I will give you the brain thing if you help me this correct way

Answers

The trains will move away from eachother. They will Repel one another because the sides that are facing eachother on the magnet are the same

The positive side of a magnet always has S. The negative side always has N. S will always face away from you in a compass

An igneous rock contains
large crystals of quartz, feldspar, and horn-
blende. How did the rock most likely form?

Answers

These minerals are quartz, feldspar, mica, and usually hornblende. Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly. This allows crystals of the four minerals to grow large enou

An understanding of biology can help you to make informed choices about the ____________________________________________.

a. food you eat

b. food you eat and fluids your drink

c. medications and supplements you ingest

d. All of the above are correct

PLEASE DONT GET ME WRONG

Answers

Answer:

d

Explanation:

the answer is d. all of the above.

Please help will give brainliest

Answers

Answer:

B

Explanation:

Hope this helps have a nice day.

*You don't have to read this part*

Since Canis is a proper noun then C and B should be emilinated.

Lupus is also a proper noun therefore A being eliminated.

Thats how I got B.

Some plants have a waxy covering on their leaves. How does the waxy covering help
the plant to survive?
O It allows the plant leaves to grow wider and collect more sunlight.
It discourages predators from eating the plant.
It helps the plant reproduce faster in colder environments.
O It helps the plant keep its moisture in hot weather conditions.

Answers

Answer:

It helps the plant retain water.

The waxy covering on plant leaves, young stems, and fruit is called the "cuticle". It is composed of cutin, a wax-like material produced by the plant that is chemically a hydroxy fatty acid. The purpose of this covering is to help the plant retain water.

Answer:

D. It helps the plant keep its moisture in hot weather conditions.

Explanation:

Write a poem about symbiotic relationships. It must include Commensalism Mutualism, Parasitism, Competition, and Predation.

Answers

Answer:

Explanation about Commensalism Mutualism, Parasitism, Competition, and Predation are given below.

Explanation:

There are various symbiotic relationship formed between the organisms present in the environment. These relationships are Commensalism Mutualism, Parasitism, Competition, and Predation. In Commensalism relationship, one organisms gets benefits while the other neither get benefit nor harm. In mutualism, both organisms gets benefits from one another. In Parasitism, one organism get benefits and the other get harmed. In Competition, both organisms cause harm to one another and both are damaged through their actions and in Predation, one organism is benefited by killing the other organism to feed itself.

Which of the following bacteria are responsible for causing the greatest number of foodborne illnesses?

A)Salmonella
B)Campylobacter
C)E. Coli
D)Listeriosis

Answers

Answer:

A. Salmonella

B. Campylobacter

Answer:

Salmonella, Campylobacter, and Toxoplasma caused the greatest number of foodborne illnesses.

-TheUnknownScientist

how is population dynamics affected by water pollution

Answers

Answer:

As population density increases the demand for the limited fresh water also increases. in most of the case, the water is not treated properly and as such it leads to pollution of surface - level fresh water, and seeps into the ground, polluting ground water as well

Urgent!!!
What are wholesale sales?

O Large orders that receive a discount.

O Everything that is included in a single order to a customer.

O Sales made in bulk to another business.

O Sales of generic-brand or out-of-season items.

Answers

Answer:

Sales made in bulk to another business

This is the ultimate source of our energy

Answers

Answer:

yes thats right, its the sun

The sun. Is the right answer

how are macromolecules used in the body? (2-3 sentences)

Answers

macromolecules provide structural support, a source of stored fuel, the ability to store and retrieve genetic information, and the ability to speed biochemical reactions. Four major types of macromolecules—proteins, carbohydrates, nucleic acids, and lipids—play these important roles in the life of a cell.

As you move away from the equator...
A
the amount of blodiversity Increases because the average temperature increases.
B
the amount of blodiversity Increases because the amount of precipitation Increase
C
the amount of blodiversity decreason because the average temperature decreases.
D
the amount of blodiversity decreason because the amount of sunlight Increases.

Answers

Answer:

C

Explanation:

7. Mendel did not know when he began his
experiment that the traits had only two forms and that
each trait was controlled by only one gene. Why is it
important that he chose pea plants for his
experiments?

Answers

Answer:

1. Many varieties were available in alternative forms of a character

2. Varieties were available in pure from start please true that is produced the same type of generation after generation

3. Peace and normally self pollinated but self pollination could be prevented by removing corresponding a productive path main parts demons and female bad kapil's after flour and could as well be crossed

pollinated artificially

When you drop oil into cup of water, why does it hold together instead of breaking up in the water? Name at least three common substances which are examples of lipids that relate to the following areas of life: driving, eating, and your own body.

Answers

1. Oils are hydrophobic. Liquid water is held together by hydrogen bonds, and oils do not have a polar part, and it can not break hydrogen bonds, so it is forced to not dissolve in the water.

2. Three common substances which are examples of lipids that relate to driving is oil, one common substance of lipids that is related to eating is butter, and one substance of lipids that is related to your body are fats.

Need help with this question, thanks :)

Answers

Answer:

A. White dwarf

Biology 9th grade need help asap please
The sides or backbone of DNA is made up of what two molecules? (green in the diagram below)

Multiple choice answers
-Sugar-Nitrogen Base
-Sugar-Phosphate
-Phosphate-Nitrogen Base
-All sugar molecules

Answers

Answer: A sugar-phosphate backbone (alternating grey-dark grey) joins together nucleotides in a DNA sequence. The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

Explanation:

Answe

???

Explantion hehehehehehheheheh

Nuclear power plants do not release smoke and ash into the air.
True
False

Answers

The answer to this is false

A drought is a period of unusually low rainfall. A farmer notices that well
on the farm stops providing water during a drought. A nearby lake also has less water in it than usual. Write a
couple of sentences that explains what has happened to the water table in the area to cause these results.

Answers

Due to the drought, the water goes through the process of evaporation where it turns into a gas causing less water in the well and lake

Rocks change during metamorphism because the minerals need to be stable under the new temperature and pressure conditions. While metamorphic rocks are forming, the extreme heat changes the size and shape of the mineral grains in the rock.
Which statement describes the effect of the conditions described in this passage?

A. The need for stability may cause the structure of minerals to rearrange and form
new minerals
B. Great pressure from tectonic plate collisions can change rock into metamorphic
rock
C. The high temperatures of the magma can change nearby rock into metamorphic
rock
D. Metamorphic rocks are classified according to the arrangement of the grains in
their makeup
PLS HELP ME !!!!!!!!!!!!! i made another question 2 hrs ago with the same question and nobody answered it so pls help :((((((((

Answers

Answer:

B

Explanation:

I think it's b, but I'm not so sure

Describe the relationship between density and temperature

Answers

Answer:Density is directly proportional to pressure and indirectly proportional to temperature. As pressure increases, with temperature constant, density increases. Conversely when temperature increases, with pressure constant, density decreases.

Explanation:  :  )

Other Questions
2. Why are education and communication important in Maniac Magee and The Story of MyLife? Provide evidence from the text to support your answer. Which of the following statements which does not express a value from the story of Odysseus and the Cyclops?Select all correct answers.Odysseus expected the Cyclops to give them provisions because strangers were supposed to be treated kindly and given gifts.Odysseus went to the island of the Cyclops because he wanted his men to prove their bravery.The Cyclops invited Odysseus into the cave because he wanted to share the warmth of his fire with his guests. nadine is the systems administrator for a network with a single subnet. The subnet uses 192.168.1.0 with a mask of 255.255.255.0. The network has 10 servers running Windows Server. Srv1 currently provides both DHCP and DNS services. Nadine wants to increase the fault tolerance for her DHCP servers. She installs a new server, Srv11, and configures it for DHCP. She configures a scope on Srv11 to match the scope on Srv1 and then excludes half of the addresses in the scope on Srv1 and the other half of the addresses on the Srv11. Nadine decides to test her solution and shuts down Srv1. As a test, she forces a workstation to release its IP address and request a new one. She finds that the workstation has the IP address 169.254.0.15 with a mask of 255.255.0.0. What should Nadine do to fix the problem? A significant shift in the environmental conditions over a very short period of time caused most groups of dinosaurs to become extinct because of their inability to adapt fast enough. This allowed for a variety of niches to open providing current organisms new opportunities. Mammals were one group of organisms that took advantage of this environmental change, filling niches that were unoccupied and eventually developing new species that were specifically adapted to their particular environment. Which of the following is a term that most correctly describes this process?A. Adaptive radiationB. GradualismC. Convergent evolutionD. Genetic drift Help me ASAP please!!! Which principle included in the Texas Constitution restricts the amount of money thestate government can spend?separation of powerslimited governmentpopular sovereigntyindividual rights Suppose a blanket has a sock stuck to it due to static electricity. When you pull the sock off of the blanket, what happens to the potential energy between them? Robert and his friends went to have lunch at a restaurant. The service was great, so they decided to leave a 20% tip. Is the final amount cheaper or more expensive? Whoever answers correctly will get Brainliest! Have an amazing day!! :)))) 3.14*3.14*3.14*x*x*x*x Distributive Property step by step 3x(x-1) tHxs Whats the answer???? One of the offenses the British charged her with was cross-dressing. Why do you think she wore mens clothing? in what town did the mystery occur Select the correct answer.What is the final step for a policy to become a law in Florida?A. A policy is debated and formed.B. A policy is implemented and approved.C. A policy is evaluated and improved.D. A policy is identified and discussed. Help me with my math homework 1. A student mixes two liquids together and notices that a white solid has formedat the bottom of the container.What can the student conclude?1. A precipitate has formed.2. A physical change has occurred.3. A chemical reaction has occurred.4. A chemical change has occurred. A cylinder with the height of 6km has a volume of 384km3 what is the radius? solve the rational equation X+3/ 3x -2 - x-3/3x+2=176/9x^2-4 Which of the following passages from an essay about online shopping bestuses precise language and domain-specific vocabulary to support the topic?A. Pablo Frank at Global Enterprises is kind of a big deal, so if he'sgonna point out that certain trends are going to blow up, you'dbest listen.B. I was stoked to find out that I'm pretty much right in the middle interms of average hours per day spent Internet shopping. What wasI worried about?C. Internet users are well aware that Internet use is a phenomenonthat has become an interesting trend over time.D. Experts at the Institute for Global Business point out that thecurrent trends in Internet-based commerce will continue to solidifyin the years to come. Which of the following tables represent input and output values of a linear function? Select all that apply. Graph them on grid paper, if needed.Input Output1 3.52 5.53 7.54 9.5Input Output3 35 56 68 8Input Output0 11 22 53 10Input Output2 84 96 108 11