| HEP | hemolysis end point; hepatoerythropoietic porphyria; high egg passage [virus]; high-energy phosphate... |
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| HFD | hemorrhagic fever of deer; high-fiber diet; high forceps delivery; hospital field director; human fa... |
| HFHV | high frequency, high volume |
| HFO | high-frequency oscillator; high-frequency oscillatory [ventilation] |
| HFT | high-frequency transduction; high-frequency transfer |
| control gene | See: operator gene, regulator gene. (05 Mar 2000) |
|---|---|
| control group | A group of subjects participating in the same experiment as another group of subjects, but which is not exposed to the variable under investigation. See: experimental group. (05 Mar 2000) |
| control limit | A regulatory value applied to the airborne concentration in the workplace of a potentially poisonous substance which is judged to be reasonably practicable for the whole spectrum of work activities and which must not normally be exceeded. (09 Oct 1997) |
| Control of Communicable Diseases in Man | The internationally recognised authoritative manual now in the 15th (1990) edition, published by the American Public Health Association. (05 Mar 2000) |
| control plot | A plot in which no vegetation will be cut and natural succession will occur. A control plot serves as a baseline to compare other treatments (Early, Mid and Late Seral). (05 Dec 1998) |
| control release suture | Eyeless suture with thread attached to needle such that the two separate when tension is applied to the thread. (05 Mar 2000) |
| control syringe | A type of Luer-Lok syringe with thumb and finger rings attached to the proximal end of the barrel and to the tip of the plunger, allowing operation of the syringe with one hand. Synonym: ring syringe. (05 Mar 2000) |
| poison control centres | Facilities which provide information concerning poisons and treatment of poisoning in emergencies. (12 Dec 1998) |
| cost control | The containment, regulation, or restraint of costs. Costs are said to be contained when the value of resources committed to an activity is not considered excessive. This determination is frequently subjective and dependent upon the specific geographic area of the activity being measured. (12 Dec 1998) |
| population control | Includes mechanisms or programs which control the numbers of individuals in a population of humans or animals. (12 Dec 1998) |
| positive control | Mechanism for gene regulation that requires that a regulatory protein must interact with some region of the gene before transcription can be activated. (18 Nov 1997) |
| self-control | 1. Self-regulation of one's behaviour in accordance with personal beliefs, goals, attitudes and societal expectations. 2. Use by an individual of active coping strategies to deal with problem situations, in contrast to passive conditioning strategies which do things to the individual and require no action by the person. (05 Mar 2000) |
| social control | The influence on the behaviour of a person exerted by other persons or by society as a whole; e.g., through appropriate social norms, ostracism, or the criminal law. (05 Mar 2000) |
| social control, formal | Control which is exerted by the more stable organizations of society, such as established institutions and the law. They are ordinarily embodied in definite codes, usually written. (12 Dec 1998) |
| social control, informal | Those forms of control which are exerted in less concrete and tangible ways, as through folkways, mores, conventions, and public sentiment. (12 Dec 1998) |