group (grup)

1. A number of similar or related objects. 2. In chemistry, a radical. For individual chemical groups, see the specific name.
blood g. See blood group.
characterizing g. a g. of atoms in a molecule that distinguishes the class of substances in which it occurs from all other classes; thus carbonyl (CO) is the characterizing g. of ketones; COOH, of organic acids, etc.
connective tissue g. a collective name for mucous tissue, dentin, bone, cartilage, and ordinary connective tissue, all derived from the mesenchyme.
control g. a g. of subjects participating in the same experiment as another g. of subjects, but which is not exposed to the variable under investigation. See also experimental g.
cytophil g. the atom g. in the antibody (amboceptor) that binds it to the cell.
determinant g. antigenic determinant
diagnosis related g. a scheme for billing for medical and especially hospital services by combining diseases into g.'s according to the resources needed for care, arranged by diagnostic category. A dollar value is assigned to each g. as the basis of payment for all cases in that group, without regard to the actual cost of care or duration of hospitalization of any individual case, as a mechanism to motivate health-care providers to economize.
encounter g. a form of psychological sensitivity training that emphasizes the experiencing of individual relationships within the g. and minimizes intellectual and didactic input; the g. focuses on the present rather than concerning itself with the past or outside problems of its members. See also sensitivity training g.
experimental g. a g. of subjects exposed to the variable of an experiment, as opposed to the control g.
functional g. See function (4).
HACEK g. a group of Gram-negative bacteria that includes Haemophilus spp., Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae. Bacteria in this group have in common a culture requirement of an enhanced carbon dioxide atmosphere and ability to infect human heart valves.
linkage g. a set of two or more loci that have been shown by linkage analysis to be physically close in the genome but that have not yet been assigned to specific chromosomes. It is rapidly becoming an outmoded term.
matched g.'s a method of experimental control in which subjects in one g. are matched on a one-to-one basis with subjects in other g.'s concerning all organism variables (e.g., age, sex, height, weight) which the experimenter believes could influence the variable being investigated.
prosthetic g. a non-amino acid compound attached to a protein, often in a reversible fashion, that confers new properties upon the conjugated protein thus produced. See also coenzyme.
sensitivity training g. a g. in which members seek to develop self-awareness and an understanding of g. processes rather than to obtain therapy for an emotional disturbance. See also encounter g., personal growth laboratory.
symptom g. See syndrome, complex (1).
T g. abbreviation for training g.
therapeutic g. any g. of patients meeting together for mutual psychotherapeutic, personal development, and life change goals.
training g. (T g.) any g. emphasizing training in self-awareness and group dynamics. See sensitivity training g.


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