The stool samples submitted by the two friends were enumerated following enrichment. The technician prepared serial dilutions. A volume of 1 mL of stool was mixed with 1 mL of diluent. From this dilution, they then took 1 mL and added it into 1 mL of diluent. The operation was repeated 5 more times. After finishing the serial dilution, 100 μ�L has been spread on different TSA plates. Following 24h incubation, the technician counted 23 colonies at the dilution 4.   What is the bacterial concentration in the enriched culture? [1 mark]

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A:

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Scientific Notation

We have to deal with quantities that are extremely large or very small. For example- I may have 6,500,000,000 red blood cells, or the diameter of an iron atom is 0.000000011 inches. Numbers with many zeros can be inexpedient to work with, so scientists use scientific notation. It represents very large numbers or very small numbers in a simple form. We know that whole numbers can be extended to infinity, but we cannot write such large numbers on paper. Numbers that present in millions of places after the decimal point need to be represented simply. Thus, it is difficult to represent a few numbers in their extended form. Therefore, we use scientific notation.