U.S. flag

An official website of the United States government

Items per page

Send to:

Choose Destination

Search results

Items: 20



A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.


chemistry [Subheading]

Used with chemicals, biological, and non-biological substances for their composition, structure, characterization, and properties; also used for the chemical composition or content of organs, tissue, tumors, body fluids, organisms, and plants. Excludes chemical analysis and determination of substances for which "analysis" is used; excludes synthesis for which "chemical synthesis" is used; excludes isolation and purification of substances for which "isolation and purification" is used.

Year introduced: 1991


Chemistry Techniques, Synthetic

Methods used for the chemical synthesis of compounds. Included under this heading are laboratory methods used to synthesize a variety of chemicals and drugs.

Year introduced: 2012


Click Chemistry

Organic chemistry methodology that mimics the modular nature of various biosynthetic processes. It uses highly reliable and selective reactions designed to "click" i.e., rapidly join small modular units together in high yield, without offensive byproducts. In combination with COMBINATORIAL CHEMISTRY TECHNIQUES, it is used for the synthesis of new compounds and combinatorial libraries.

Year introduced: 2011


Chemistry, Analytic

The branch of chemistry dealing with detection (qualitative) and determination (quantitative) of substances. (Grant and Hackh's Chemical Dictionary, 5th ed)

Year introduced: 2010


Green Chemistry Technology

Pollution prevention through the design of effective chemical products that have low or no toxicity and use of chemical processes that reduce or eliminate the use and generation of hazardous substances.

Year introduced: 2009


Organic Chemistry Phenomena

The conformation, properties, reaction processes, and the properties of the reactions of organic carbon compounds.

Year introduced: 2009


Combinatorial Chemistry Techniques

A technology, in which sets of reactions for solution or solid-phase synthesis, is used to create molecular libraries for analysis of compounds on a large scale.

Year introduced: 2000


Clinical Chemistry Tests

Laboratory tests demonstrating the presence of physiologically significant substances in the blood, urine, tissue, and body fluids with application to the diagnosis or therapy of disease.

Year introduced: 1998


Chemistry, Bioinorganic

Field of chemistry pertaining to the study of inorganic compounds or ions and their interactions with biological ligands at the molecular level.

Year introduced: 1989


Chemistry, Inorganic

A field of chemistry which pertains to chemical compounds or ions that do not contain the element carbon (with the exception of carbon dioxide and compounds containing a carbonate radical, e.g., calcium carbonate).

Year introduced: 1989


Chemistry, Physical

The study of CHEMICAL PHENOMENA and processes in terms of the underlying PHYSICAL PHENOMENA and processes.

Year introduced: 1965


Chemistry, Pharmaceutical

Chemistry dealing with the composition and preparation of agents having PHARMACOLOGIC ACTIONS or diagnostic use.


Chemistry, Organic

The study of the structure, preparation, properties, and reactions of carbon compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Year introduced: 1966


Chemistry, Clinical

The specialty of ANALYTIC CHEMISTRY applied to assays of physiologically important substances found in blood, urine, tissues, and other biological fluids for the purpose of aiding the physician in making a diagnosis or following therapy.

Year introduced: 1967(1966)


Chemistry Techniques, Analytical

Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.

Year introduced: 2010 (1963)


Chemistry, Agricultural

The science of the chemical composition and reactions of chemicals involved in the production, protection and use of crops and livestock. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)


Brain Chemistry

Changes in the amounts of various chemicals (neurotransmitters, receptors, enzymes, and other metabolites) specific to the area of the central nervous system contained within the head. These are monitored over time, during sensory stimulation, or under different disease states.

Year introduced: 1965


Computational Chemistry

A branch of chemistry that utilizes computers as well as principles of chemistry and mathematics to generate data and solve problems related to the properties, structures, and reactions of molecules and materials.

Year introduced: 2020


Chemical Phenomena

The composition, structure, conformation, and properties of atoms and molecules, and their reaction and interaction processes.

Year introduced: 2009

Items per page

Send to:

Choose Destination

Supplemental Content

Loading ...
Support Center