precursor


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precursor

a chemical substance that gives rise to another more important substance
References in periodicals archive ?
International efforts will increasingly need to focus on enhanced voluntary identification and reporting of possible substitute precursor chemicals; initiatives to track, seize, and safely dispose of diverted chemicals; and further engagement with the private sector to support such voluntary efforts.
While process conditions, such as the temperature of the substrate, the flow rate of the carrier gas(es), and the concentration of the precursors are important in determining the nature and quality of the deposited film or coating, the choice of precursor chemicals has the greatest impact on the material that will be generated.
The forum will also discuss the risks and challenges facing the Arab region due to the increased demand for precursor chemicals and the strategy to combat precursor chemicals.
By studying the chemical reactions carefully, the research team found that it was possible to generate only the natural form of the necessary RNA precursors by including simple amino acids.
The investigators also found that different precursors for late preterm deliveries were associated with differing rates of neonatal morbidity in the study a factor that has implications for counseling patients about the risks and benefits of late preterm delivery, they reported.
Much of the world's precursor diversion happens at or when crossing international borders, and national authorities often find it difficult to verify the foreign buyer's legitimacy, particularly if exporting and importing countries' authorities are not cooperating on the issue.
In contrast, the approach the NRC actually used was a nonstandard approach for developing an RfD based on the inhibition of iodine uptake, a distant precursor to the critical effect.
However, although effectively managing precursors is challenging, choosing not to use precursor information to improve safety is unacceptable in high-hazard industries.
After the precursor phenyl-2-propanone was restricted in 1980, traffickers switched to ephedrine; when large quantities of ephedrine became harder to come by in the late '90s, they switched to pseudoephedrine.
Cleavage of the HA0 precursor in LPAI viruses is catalyzed only by trypsin and trypsinlike host proteases restricting virus replication to locations where these proteases are found, namely, respiratory and intestinal tracts.
To make the glassy shapes, the researchers extracted DNA from the bacterium Escherichia coli and mixed it in a test tube with silica-containing precursor molecules.