Why Do Variations In Generation Time Exist

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On the other side of the spectrum there is M leprae with the longest known generation time of about 14 days (Compare that with Mycobacterium tuberculosis for which it is about 18 hours). Before I go further down the discussion let me first talk about basics of Bacterial growth curve.

What is the generation time of Staphylococcus aureus?

Staphylococcus aureus was grown exponentially at two doubling times (DT) one related to in vivo (DT 60 min) and one typical of laboratory conditions (DT 24 min) and under iron-poor and iron-rich conditions.

What is the purpose of a bacterial growth curve?

bacterial growth curve A curve on a graph that shows the changes in size of a bacterial population over time in a culture. The bacteria are cultured in sterile nutrient medium and incubated at the optimum temperature for growth. Samples are removed at intervals and the number of viable bacteria is counted.

What is it called when a population levels off?

Eventually the growth rate will plateau or level off making an S-shaped curve. … The population size at which it levels off which represents the maximum population size a particular environment can support is called the carrying capacity or K.

What is Generation time in cell cycle?

generation time The time required for a cell to complete one full growth cycle. If every cell in the population is capable of forming two daughter cells has the same average generation time and is not lost through lysis the doubling time of the cell number in a population will equal the generation time.

What is the key factor that determines the growth rate of a human population?

What four factors determine the growth rate of a population? Immigration births emigration and death determines growth rate of population.

Are microorganisms?

An organism that can be seen only through a microscope. Microorganisms include bacteria protozoa algae and fungi. Although viruses are not considered living organisms they are sometimes classified as microorganisms.

What is the generation time of a bacterial culture?

Generation time is the time it takes for a population of bacteria to double in number. For many common bacteria the generation time is quite short 20-60 minutes under optimum conditions. For most common pathogens in the body the generation time is probably closer to 5-10 hours.

Can time affect how much bacteria grow?

Bacterial Contamination Can Spread Quickly

See also how does carbon become part of organic molecules

The USDA says that bacteria doubles every 20 minutes when food is in the “danger zone” of temperatures which is defined as between 40 and 140 F. As a rule of thumb never leave your food out for more than two hours before refrigerating it.

What do you understand by doubling time of generation time?

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