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was used to analyze data from the storage studies (21). Means were separated using the p-diff test. For each treatment, two or three separate reactions were examined during storage. Because a subsample was removed from each reaction vessel at each time point, repeated measures were used. Analysis of repeated measures data requires special attention to the covariance structure due to the sequential nature of the data on each experimental unit ¡£The mixed model allows the capability to address the issue directly by modeling the covariance structure. The variation between separate vessels within a treatment is specified by a
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