| gate-control theory | A theory to explain the mechanism of pain; small fibre afferent stimuli, particularly pain, entering the substantia gelatinosa can be modulated by large fibre afferent stimuli and descending spinal pathways so that their transmission to ascending spinal pathways is blocked (gated). Synonym: gate-control hypothesis. (05 Mar 2000) |
|---|---|
| case-control study | <epidemiology> A study in which the risk factors of people with a disease are compared with those without a disease. It is an epidemiological method that begins by identifying persons with the disease or condition of interest (the cases) and compares their past history of exposure to identified or suspected risk factors with the past history of similar exposures among persons who resemble the cases but do not have the disease or condition of interest (the controls). The relationship of an attribute to the disease can therefore be examined by comparing affected and non-affected individuals with regard to the frequency or levels of the attribute in each group. (05 May 2002) |
| vestibulo-equilibratory control | Nerve impulses transmitted from the saemicircular canals, saccule, and utricle that serve to maintain the equilibrium of the body. (05 Mar 2000) |
| reflex control | Nerve impulses transmitted to the muscles to maintain normal reflex action. (05 Mar 2000) |
| relaxed control | The ability of certain plasmids to continue to replicate after their bacteria stop dividing, theresult is a single bacteria that containshundreds of plasmids. (09 Oct 1997) |
| Centers for Disease Control and Prevention | <organisation> The U.S. Public health agency serving as the centre for preventing, tracking controlling and investigating the epidemiology of AIDS and other diseases. (26 Mar 1998) |
| reproductive control agents | Substances used either in the prevention or facilitation of pregnancy. (12 Dec 1998) |
| Centres for Disease Control | The federal facility for disease eradication, epidemiology, and education headquartered in Atlanta, Georgia, which encompasses the Centre for Infectious Diseases, Centre for Environmental Health, Centre for Health Promotion and Education, Centre for Prevention Services, Centre for Professional Development and Training, and Centre for Occupational Safety and Health. Formerly named Centre for Disease Control (1970), Communicable Disease Centre (1946). (05 Mar 2000) |
| centres for disease control and prevention | See: CDC. (12 Dec 1998) |
| riot control agents, chemical | Chemical substances which are employed during a riot in order to control or disperse the rioting parties. (12 Dec 1998) |
| growth control | <cell biology> When applied to cells usually means control of growth of the population, i.e. Of the rate of division rather than of the size of an individual cell. (18 Nov 1997) |
| pest control | The reduction or regulation of the population of noxious, destructive, or dangerous insects or other animals. (12 Dec 1998) |
| pest control, biological | The use of biological mechanisms, usually involving living organisms such as bacteria, for the reduction or regulation of the population of noxious, destructive, or dangerous pests. Environmental concerns have focused attention on natural forms of disease control as potentially safe and effective alternatives to chemical pesticides. This has led to increased efforts to develop control strategies that rely on natural predators and parasites or that involve genetically engineered microbial pest control agents. (12 Dec 1998) |
| rodent control | The reduction or regulation of the population of noxious, destructive, or dangerous rodents through chemical, biological, or other means. (12 Dec 1998) |
| weed control | <botany> Mechanical or chemical control of unwanted plants. Measures which have to be undertaken in a plant community to guarantee the growth of the desired vegetation. See: herbicide. (09 Oct 1997) |