The doubling time refers to the time it takes to double the growth of specific elements of a group, such as populations or living cells. Knowing the doubling time can be useful for estimating geographic areas where resources may be scarce due to extreme and sudden population increases, or for estimating the rate of growth of cancer, or other harmful cells, to decide if necessary whether to adopt. a particular course of treatment. Growth rates and doubling time can also be affected by environmental resources or, in the case of drugs, antibiotics or chemotherapy. If you have the tools you need to find population growth rate data, such as the Internet or other resources, and if you have a good calculator, you can use a simple standard equation to estimate doubling time. If you just want to find data on population growth rate you can easily find it on the Internet or contact cities, counties or state government offices to get census information and be pointed in the right direction. But if you need to calculate the growth rate, you can do it easily if you have some initial population data, be it human populations or living cells.
Steps
Method 1 of 3: Calculate the Growth Rate
Step 1. Obtain a tally of the current total number of the population of interest to calculate the doubling time (local population, cells)
Step 2. Obtain the total population number from one year ago (or any previous year)
Step 3. Calculate the growth rate using this formula:
(Present Value - Past Value) / Past Value. Multiply the result by 100.
Method 2 of 3: Calculate the doubling time
Step 1. Divide the percentage of the growth rate by 100 to get a decimal number, if your value is not already in this form
Step 2. We put "70" as the constant in the doubling equation
Step 3. The doubling time will be represented by "t"
Step 4. The growth rate will be represented by "k"
Step 5. Use the equation t = 70 / k
Step 6. Solve "t" by dividing 70 by "k" (the growth rate), the answer will give you the doubling time
Method 3 of 3: Calculate the Doubling Level Period (PDL)
Step 1. Calculate the PDL using the following equation:
- PDL = X + 3,222 (log Y - log I)
- Where is it:
- X = initial PDL
- I = cell inoculation (number of cells introduced into the culture medium)
- Y = final cell yield (number of cells at the end of the growth period).
