microbio dilution quiz
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11 Terms
What pathogen is most commonly looked for in urine samples
e. coli
how do we count bacteria
dilution
what is a dilution that involves a stepwise reduction of concentration in a series, where each step uses the previous dilution as a source, creating an exponential dilution range
serial dilution
what is a dilution that involves creating each concentration directly from the stock solution
full dilution
what is a dilution that reduces the concentration of a solution to one-tenth of its original strength
tenfold dilution
what is the countable range for colony forming units (CFUs)
30-300
What is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration
calibration curve
What is an analytical instrument that measures the properties of light—specifically intensity, wavelength, and frequency—across the electromagnetic spectrum.
spectrometer
What does a spectrometer measure
light absorbance
What must be known in order to plot a calibration curve
standard curve
What is a dilution that reduces the concentration of a solution by half in each step
twofold dilution