A student who was trying to determine the concentration of escherichia coli in a sample completed a total plate count assay. After plating 1ml of the 10-6dilution tube and incubating the plate at 37C for 24 hours the student counted 210 colonies on the plate. What is the cfu/ml of the original sample?.

Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description. Any type of chemical combination can be referred to by the term "concentration," however solutes and solvents in solutions are most usually mentioned. There are many types of molar (quantity) concentration, including normal concentration and osmotic concentration. the practice or act of focusing: the quality of being focused, especially: giving all of one's attention to one thing My attention is being disrupted by all that noise. a concentration inside a major or a major's academic major The student decided to concentrate on law.

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