Although the original AOAC 991.39 method was designed to use 19 mg of oil, we adapted the method to reduce the overall sample requirement to 4 10 mg.
Moreover, the high sensitivity and small sample requirements (low to sub-pmol levels of UDP-GlcNAc) make the technique well suited for timecourse measurements.
Simulation results indicate that a few small risk-free intervals only marginally affect the required sample size, whereas the presence of longer and more frequent risk-free intervals increases the sample size requirements to N=184 individuals.
Sample size requirements to detect uncommon events such as deaths and disabilities together with challenges of household surveys of women in the Islamic cultural context indicated that a population-based school survey of youth in generally large families was the most feasible study design.
We also characterize the implications of a multisite versus single site study design for statistical power, including a figure that shows sample size requirements to detect activation in two key nodes of the working memory circuitry given observed differences in reliability of measurement between single and multisite designs.
The tremendous progress in development of new analytical technologies results in specific sample quality requirements to readily exploit the potential of recent technologies.
However, the cost of the analysis should be carefully weighed against the sample number requirements to ensure that the overall cost is in keeping with the study budget.
Ph->E transmission in the AE model, in contrast, fares well in terms of sample size requirements to resolve this feature (see Table 1).
Sample size requirements to detect a certain difference in PRO could be larger if different administration formats are used because of greater standard deviations and because effect estimates are likely to be attenuated by additional (non-differential) measurement error [ 9, 10].
These improvements are timely given increased sampling throughput requirements to capture temporal and spatial variability, and efforts to develop model systems from lower abundance viral types through culture-based isolations.
