| lutheran blood-group system | A complex blood group system having pairs of alternate antigens and amorphic genes, but also subject to a dominant independently segregating repressor. (12 Dec 1998) |
|---|---|
| age groups | Persons classified by age from birth (infant, newborn) to octagenarians and older (aged, 80 and over). (12 Dec 1998) |
| matched groups | A method of experimental control in which subjects in one group are matched on a one-to-one basis with subjects in other group's concerning all organism variables (e.g., age, sex, height, weight) which the experimenter believes could influence the variable being investigated. (05 Mar 2000) |
| minority groups | A subgroup having special characteristics within a larger group, often bound together by special ties which distinguish it from the larger group. (12 Dec 1998) |
| plant families and groups | Groupings that include specific plants within larger families or divisions. (12 Dec 1998) |
| self-help groups | Organizations which provide an environment encouraging social interactions through group activities or individual relationships especially for the purpose of rehabilitating or supporting patients, individuals with common health problems, or the elderly. They include therapeutic social clubs. (12 Dec 1998) |
| sensitivity training groups | A group of people who meet in an unstructured setting to learn about themselves, interpersonal relationships, and group processes and about larger social systems. (12 Dec 1998) |
| diagnosis-related groups | A system for classifying patient care by relating common characteristics such as diagnosis, treatment, and age to an expected consumption of hospital resources and length of stay. Its purpose is to provide a framework for specifying case mix and to reduce hospital costs and reimbursements and it forms the cornerstone of the prospective payment system. (12 Dec 1998) |
| occupational groups | Members of the various professions (e.g., physicians) or occupations (e.g., police). (12 Dec 1998) |
| transferases (other substituted phosphate groups) | <enzyme> A class of enzymes that transfers substituted phosphate groups. Registry number: EC 2.7.8 (12 Dec 1998) |
| ethnic groups | A group of people with a common cultural heritage that sets them apart from others in a variety of social relationships. (12 Dec 1998) |
| focus groups | A method of data collection and a qualitative research tool in which a small group of individuals are brought together and allowed to interact in a discussion of their opinions about topics, issues, or questions. (12 Dec 1998) |
| ABO blood group | <haematology> The major human blood type system which describes the oligosaccharide glycoprotein antigens found on the surface of human blood cells. According to the type of antigen present, a person may be assigned a blood type of A, B, AB or O. A second type of antigen, the Rh factor, renders a positive or negative blood type. The ABO blood group system is important because it determines who can donate blood to or accept blood from whom. Type A or AB blood will cause an immune reaction in people with type B blood and type B and AB blood will cause a reaction in people with type A blood. Conversely, type O blood has no A or B antigens, so people with type O blood are universal donors. And since AB blood already produces both antigens, people who are type AB can accept any of the other blood types without suffering an immune reaction. (04 Jul 1999) |
| Almen's test for blood | Glacial acetic acid, gum guaiac solution, and hydrogen peroxide are added to an aqueous suspension of the suspected stain; if occult blood or blood pigment is present, a blue colour develops. Synonym: guaiac test, Schonbein's test, van Deen's test. (05 Mar 2000) |
| arterial blood | Blood that is oxygenated in the lungs, found in the left chambers of the heart and in the arteries, and relatively bright red. (05 Mar 2000) |