Sentence examples for substances is unknown from inspiring English sources

The potential danger to human health and the environment represented by the existing substances is unknown, hence the new policy.

This is especially important either if comprehensive chemical analysis of eluates is not possible, or if the environmental impact of the analyzed substances is unknown.

Though the FDA says propylene glycol and glycerin food additives are "generally regarded as safe," the long-term effects of inhaling the substances are unknown.

Some sort of packing was also applied subcutaneously, but the exact make-up of this particular embalming substance is unknown.

Given that the substance is unknown, no toxicity data or official guidance apply.

In prospectively determining the statistical power of a study, the researcher will give thought to the likely magnitude of change in any given parameter in comparison to the known background variation for that parameter in the test species; however, this is not possible where the test substance is unknown and the potential target organ(s) or effects(s) is also unknown.

Moreover, students had to overcome some difficulties within the environment: The name of the chemical substance was unknown, and students had to suggest a plausible synthesis.

What that filler substance was is unknown.

However, the neuronal expression of CB2-Rs in the brain and its role in depression and substance abuse is unknown.

Therefore, neuronal expression of CB2-Rs had been ambiguous and controversial and its role in depression and substance abuse is unknown.

There is some uncertainty in the diagnoses of non-consenters as these may be based on initial interviews where status of substance use is unknown or clinical diagnoses are based on discharge letters.