Glossary

Health Authorities

Highly Active Antiretroviral Therapy

Haloacetic Acids

Human Artificial Chromosome

Human Anti-Chimeric Antibody

Hazard Analysis and Critical Control Point

A single or multicellular, absorptive (root hair) or secretory (glandular hair) and sometimes only a superficial outgrowth (covering hair) of the epidermal cells. The term trichome is often used but includes outgrowths from tissue below the epidermal layer. Distinguishing between hairs and trichomes can be difficult. Trichomes are usually connected to the vascular system, whereas hairs lack a vascular connection.

A double helical region formed by base pairing between adjacent (inverted) complementary sequences in a single strand of RNA or DNA.

Transmissions (communications) which occur in only one direction at a time, but that direction can change.

Access device that maintains an effective barrier while enabling the head, trunk and arms of the operator to enter the working space of the separative device.

The sum of the concentration in milligrams per liter of the haloacetic acid compounds (monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid), rounded to two significant figures after addition.

An enzyme that contains a non-protein component.

One of the chlorine group (bromine, chlorine, fluorine, iodine) of elements, all univalent; they form monobasic acids with hydrogen, and their hydroxides (fluorine forms none) are monobasic acids. The radioactive element, astatine, also belongs to the halogen group.

Atoms of the chlorine family that also include fluorine, bromine, and iodine.

An organism that displays accelerated growth or is dependent on high salt concentrations.

Human Anti-Mouse Antibody

Requires the recipient of an electronic data record to acknowledge to the sender that the record has been received.

An interlocked sequence of signals between connected components in which each component waits for the acknowledgement of its previous signal before proceeding with its action, such as data transfer.

The scripted name or legal mark of an individual handwritten by that individual and executed or adopted with the present intention to authenticate a writing in a permanent form. The act of signing with a writing or marking instrument such as a pen or stylus is preserved. The scripted name or legal mark, while conventionally applied to paper, may also be applied to other devices that capture the name or mark.

A cell or organism containing only one representative from each of the pairs of homologous chromosomes found in the normal diploid cell. Having a single complete set of chromosomes, or referring to an individual or generation containing such a single set of chromosomes per cell. Usually a gamete.

A cell containing only one set, or half the usual (diploid) number, of chromosomes.

A situation in which the protein produced by a single copy of an otherwise normal gene is not sufficient to assure normal function.

Hazardous Air Pollutants

The portion of an antigen that determines its immunological specifity. When coupled to a large protein, a hapten stimulates the formation of antibodies to the two-molecule complex.