A chemical reaction is a transformation of some substances into one or more different substances.

Purification in a chemical context is the physical separation of a chemical substance of interest from foreign or contaminating substances.

But Folkman persevered, and eventually he proved that such chemical substances do exist.

The first was the 1923 textbook Thermodynamics and the Free Energy of Chemical Substances by Gilbert N. Lewis and Merle Randall.

A Poisons List under this Act, updated regularly, also includes chemical substances, which are used in pharmaceutical, manufacturing and agriculture industries.

The handling of substances that might be used for a nuclear, chemical or biological weapon requires a license from the Government.

This and other experiments on the electrical properties of materials and on the electrical effects of chemical transformations demonstrated Priestley's early and ongoing interest in the relationship between chemical substances and electricity.

By chemical terrorism, the Monitoring Team refers not only to the use of chemical military weapons, but also to the use of dual use equipment or improvised chemical dispersal devices to spread toxic materials, as well as attacks against chemical facilities to cause the release of such substances.

KEGG (Kyoto Encyclopedia of Genes and Genomes) is a collection of databases dealing with genomes, biological pathways, diseases, drugs, and chemical substances.

Banked ozone depleting substances are defined in the report to include substances that have been produced but not yet released to the atmosphere, including CFCs stored in existing equipment as a pure chemical and distributed within the cells of foams.

Banked ozone depleting substances were defined in the report to include substances that had been produced but not yet released to the atmosphere, including chlorofluorocarbons (CFCs) stored in existing equipment as a pure chemical and distributed within the cells of foams.

Indeed, scientists have not only identified some of the brain pathways that shape our ethical decisions, but also chemical substances that modulate this neural activity.

(a) The availability and cost of chemical substitutes and of alternative technologies to reduce the emissions of ozonemodifying substances and related planned and ongoing research

The IUPAC International Chemical Identifier (InChI or ) is a textual identifier for chemical substances, designed to provide a standard and human readable way to encode molecular information and to facilitate the search for such information in databases and on the web.

Our subregion is of the view that the Convention is an effective tool in the fight against the proliferation of chemical weapons and dual use substances and equipment.

Iraq also contends that Iran does not provide data demonstrating that exposure of the population to certain chemical substances could be linked to a risk of specific cancers.

In the special licences for the purchase of gunpowder, explosives and fireworks and related chemical substances, the Ministry sets down the conditions under which such materials shall be stored.

The Committee has complied with the obligation to submit annual declarations, and recently recommended to the executive branch a draft decree aimed at regulating the activities of enterprises working with chemical substances and precursors liable to be diverted into the manufacture of chemical weapons.

Protection of the environment is a high priority, as illicit crop cultivation and illicit drug production result in environmental degradation and the safe disposal of seized chemical substances is essential.

It is also empowered to issue directives specifying the prevention and protection measures to be taken by enterprises which produce, store, sell or transport hazardous, chemical and other similar substances.

Several States reported that their forensic laboratories had carried out chemical analyses of seized drugs, in order to identify the substances, their origin and new methods of illicit drug manufacture.

Registry of Toxic Effects of Chemical Substances (RTECS) is a database of toxicity information compiled from the open scientific literature without reference to the validity or usefulness of the studies reported.

It will also be responsible for drawing up the lists of chemical substances whose production, use, transport, import and export by the companies and industries requiring them is subject to control.

The Andean Cooperation Plan for the Control of Illegal Drugs and Related Offences outlined measures for strengthening and regulating the fight against drugs and included a list of controlled chemical substances.

A4.3.3.1 Substances

Uranium and other radioactive substances, products made of such substances and radioactive waste

Sami abused substances.

Control of substances

Control of substances

Convention on psychotropic substances.

ODS ozone depleting substances

OAS was planning a regional meeting later this year in 2005 on the identification and protection of dangerous substances in laboratories, intended to help Member States better protect chemical, biological and nuclear materials from illicit diversion.

The T shaped device captures the CO2 containing heavy substances from the fumes via an affinity based chemical assay that binds CO2 particles. The purified fumes are expelled via the other branch of the T shaped structure.

2.9.c Harmful and dangerous substances and the movement of such substances are governed by Regulation No. 43 (1999), which defines procedures for movement, transportation and elimination of such substances, which are subdivided into harmful, dangerous, prohibited, useful substances and waste products.

Narcotic drugs and psychotropic substances

Trafficking in ozone depleting substances

3.8.2.2 Substances of Category 3

In terms of the workers' disease structure, one may distinguish the train drivers in railway transport for vibration disease, diseases of the respiratory system, combined with inhalation of hazardous dust and chemical substances, work intoxication and various allergies.

(d) The transport of infectious substances

the Montreal Protocol on Substances that

the Montreal Protocol on Substances that

3.7.5.2.1 Decision logic 3.7.3 for substances

illegal trade in ozone depleting substances

Illegal trade in ozone depleting substances is controlled by the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer, which aims to gradually reduce and finally phase out all ozone depleting substances.

Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.