![]() ![]() Designs may be requested with more or less than 3 dilutions, uneven numbers of tubes, different confidence levels, etc. Requests for special computations and different designs will be honored as resources permit. Garthright and Blodgett (2003) discusses this spreadsheet. The attached spreadsheet should be able to handle most specialized designs. The format of the report is that of a journal submission. ![]() The organization, accuracy, completeness, interest in topic, results and explanations determine report grade. The lab report constitutes 50% of the final grade. Lab Report Overview Each student is responsible for 50% of lab work, and for individual, original reports. Consider the example of making the first standard at 1/3 the concentration of the known, the next calibrant would be 1/9th the concentration of the known. The progression of calibration standard concentration is always a geometric series. The dilution factor chosen for the series of calibration standards is achievable by using serial dilution. A serial dilution is a dilution where a series of dilutions are conducted, each one may be one-tenth as concentrated as the previous. ![]() For example, for water that is not turbid, the maximal dilution needed is 10-6 because we know that if there were 107 or more. Dilutions in the range 10-1 (1/10) to 10-8 (1/100,000,000) are generally used, although with particular types of samples the range of dilutions can be restricted. Containing a reasonable number of bacteria to count. ![]()
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