Glossary

Total concentration of carbon (organic and inorganic) in a sample.

The term used to describe inorganic ions in the water. Usually measured by measuring the electrical conductance of the water corrected to 25°C.

The sum of sensible heat and latent heat.

Total concentration of carbon as carbonates, bicorbanates, or dissolved carbon dioxide.

Concentration of dissolved ions in solution expressed in concentration units of Sodium Chloride (NaCl). It determines the operating life of ion exchange resins and is calculated from measurements of Specific Resistance.

A measure of the level of organic impurities in water by their carbon content that determines the operating life of activated carbon beds. This is one of the parameters used to determine the purity of Semiconductor Grade water. Feed water will have TOC measured in ppm (parts per million), and ultrapure water (UPW) will have TOC measured in ppb (parts per billion).

Measure of organics in water by their Carbon content. This is one of the parameters used to determine the purity of Semiconductor Grade water. Feed water will have TOC measured in parts per million. UPW will have TOC measured in parts per billion (ppb).

Total solids in water include both dissolved and suspended solids. Determined by weighing sample before and after evaporation.

A touch sensitive display screen that uses a clear panel over or on the screen surface. The panel is a matrix of cells, an input device, that transmits pressure information to the software.

(ANSI) Pertaining to a device that allows a user to interact with a computer system by touching an area on the surface of the device with a finger, pencil, or other object, e.g., a touch sensitive keypad or screen.

Pertaining to a substance that is harmful. The toxicity of a substance is the potential of that substance to cause harmful effects. These effects can strike a single cell, a group of cells, an organ system, or the entire body. A toxic effect may be visible damage, or a decrease in performance or function measurable only by a test. All chemicals can cause harm, but when only a small amount can be harmful, the chemical is considered toxic. Toxic materials may be solid, liquid, gas, vapor, dust, fume, fiber, and mist.

A substance that is harmful.

Degree of being poisonous to a living organism or person; ability to cause grave harm or death.

Negative effect of a compound, as shown by altered morphology or physiology. It is meaningful only when the effect itself is also described, such as changes in the rate of cell growth, cell death, etc.

The study of how genomes respond to environmental stressors or toxicants. Combines genome-wide mRNA expression profiling with protein expression patterns using Bioinformatics to understand the role of gene-environment interactions in disease and dysfunction.

A science that deals with poisons, their effects, and the problems involved.

A substance produced by microorganisms that can inhibit cell growth in tissue culture and may cause temperature rise in animals.

Any poisonous agent, especially a poisonous substance produced by one living organism that is poisonous to other organisms. Toxins are usually very unstable, notably toxic when introduced into the tissues, and typically capable of inducing antibody formation.

An antigenic toxin, Example is tetanus toxoid that is a bacterial vaccine.

Tissue Plasminogen Activator

A recombinant drug used in the management of heart attacks to prevent clotting. Produced by Genentech and one of the first successful recombinant DNA drugs to be commercialized.

Total Plate Count

Thermoplastic Elastomer

Thermoplastic Polyester Elastomer

Temperature Programmed Liquid Chromatography