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What is considered a significant change in annual spirometric results? What factors might account for changes in annual spirometry?
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- Explain why it is not possible to directly measure RV by spirometry.The following image is a scheme for serial dilutions prepared for spectrophotometric analysis. If the stock solution concentration is 0.05 % (v/v) can you calculate the other tube’s concentrations in % v/v? I've used this with direct dilutions, how would I use this on serial dilutions?What is the stationary and mobile phase of spectrophotometry?
- In outline form discuss the steps of Ziehl-Neelsen staining Complete the table for National Reporting Scale (Description) National Reporting Scale Result Description 0 +n 1+ 2+ 3+Why is it important that the standard curve you create in biological analyses with spectrophotometry is measured using specialty cuvettes?Why is the accuracy of the calibration curve so critical?
- What non-titrimetric method can be used to determine the iodine value of edible oil? Discuss its basic principles and general methods involved.The phenol concentration of wastewater was determined from three (3) parallel determinations, giving a mean of 0.513 μg L-1 and a standard deviation of 0.05 μg L-1. Decide at a risk level of 5% (or a confidence level of 95%) whether a reference value of 0.520 μg L-1 is statistically different.In etanol determination by specrophotometry, explain the purpose of the negative controls included in a protocol, what do they control for? (What will you learn if the negative control gives an unexpected result. i.e. returns a positive result?)