The phrase "a selection of substances" is correct and usable in written English.
You can use it when referring to a variety of different materials or chemicals that have been chosen for a specific purpose or study.
Example: "In the laboratory, we analyzed a selection of substances to determine their chemical properties and reactions."
Alternatives: "a variety of materials" or "a range of compounds."
In 1961 the UK signed up to the UN convention on drugs, joining over 150 member states in pledging to criminalise the production, supply and use of a selection of psychoactive substances.
The computer program CHEMIC could be easily introduced into consequence analysis modeling systems in order to extend their performance to address a wider selection of substances.
The white powders are a selection of novel psychoactive substances (NPS), a group of drugs that have been blamed for a string of high-profile deaths in the UK since 2009.
A selection of 10 SARM substances is depicted in figure 6, illustrating the chemical heterogeneity and thus the analytical challenge for sports drug testing laboratories for these emerging compounds.
The observed poorer response to a selection of drugs, including several new substances, in 3D compared to 2D cell culture corroborates this notion.
In the selection of substances, potassium salts act on the regulation of nerve transmission through the release of potassium ions in the extracellular medium, which upon reaching a concentration higher than the physiological concentration begin to induce depolarization of nerve cells, making the nerve unable to respond to the excitatory stimuli.
Mass spectra of the urine mixtures were recorded in the total ion mode for identification of components and for selection of substances for quantitative analysis.
Selection of substances should therefore also be based on collateral advantages of drugs that extend beyond BP reduction.
Fig. 13 The substance info page of "Alkanes, C10-13, chloro", summarizing the currently derived decisions, a selection of memos edited and the known substance identifiers.
