Although this approach has limitations, including diurnal, seasonal, and age-related changes in creatinine excretion rates (Barr et al. 2005; Lu et al. 2006), urinary creatinine was the only physiologic variable available in NHANES for dilution correction.
§Additional serum was not available for endpoint titer dilution determination.
†Starting dilutions available for rapid fluorescent focus inhibition test.
Because of volume limitations and the cytotoxicity of some specimens, 207 serum samples were available for testing at a starting dilution of 1 20, and 81 samples at a starting dilution of 1 50 (Table).
The correction procedure described in this study shows that the simultaneous measurement of Sr isotopic composition and isotope dilution is available for the case that the spike proportion in the sample-spike mixture is significantly high (84Sr/86Sr > 3.7).
The ratio DR/LPD can be intuitively understood as an effective per-capita atmospheric dilution rate available for an urban area.
In theory, scientists say, the new vaccine may also be found suitable for dilution, making perhaps as many as 200 million doses available as soon as next year if needed.
If acute- and convalescent-phase serum samples were available for a study participant, the initial dilution of the acute-phase sample was 1 80, and convalescent-phase samples were diluted to endpoint.
Induced expression level of some of the starvation markers during the lactose (fed-batch, data not shown) or medium feed (acs1, continuous culture, Figure 6C) further indicated that too little substrate was available for the culture at this low dilution rate.
A commercially available microbroth dilution assay was used to determine the MICs for 12 antimicrobial drugs.
