However, as long as there is no systematic bias in the input data, the stochastic uncertainty of the CA-predicted EC50 is always equal to or smaller than the uncertainty of the most uncertain single substance EC50 value.
The exact makeup remains uncertain, but the substances are believed to be phosphorus, sulfur or possibly hydrocarbons.
Therefore, the effect of this substance remains uncertain, and large and well-designed randomized clinical trials should be considered.
Whether men drink and use drugs because they're depressed or are depressed because of the substance abuse is uncertain.
Although the exact identity of the causative substances may be uncertain, pesticide contamination of foods is common in the EU, it often exceeds previously identified legal limits, and it involves substances that are known to be neurotoxic.
The degradation half-lives of the phenolic benzotriazoles are expected to be higher than the estimated disappearance half-lives of the proxy substance, but it is uncertain to which extent.
Others were uncertain about the "rules," like which substances could be detected, which would trigger CPS involvement, and how far back into the pregnancy a meconium test could detect substance use.
And elections also hinge on policy substance, which remains much more uncertain.
The significance of accumulation of a spectrum of compounds - toxins, drugs, bilirubin, and other metabolic substances - within the hepatocyte is uncertain, and is fertile ground for future study.
The interaction of this provision with the classification of marijuana as a Schedule I substance under the Controlled Substances Act is uncertain.
