complex (kom´pleks)

1. An organized constellation of feelings, thoughts, perceptions, and memories that may be in part unconscious and may strongly influence associations and attitudes. 2. In chemistry, the relatively stable combination of two or more compounds into a larger molecule without covalent binding. 3. A composite of chemical or immunological structures. 4. A structural anatomical entity made up of three or more interrelated parts. 5. An informal term used to denote a group of individual structures known or believed to be anatomically, embryologically, or physiologically related. [L. complexus, woven together]
aberrant c. an anomalous electrocardiographic c., more specifically an abnormal ventricular c. caused by abnormal intraventricular conduction of a supraventricular impulse.
AIDS dementia c. (ADC) a subacute or chronic HIV-1 encephalitis, the most common neurological complication in the later stages of HIV infection; manifested clinically as a progressive dementia, accompanied by motor abnormalities.AIDS dementia, HIV encephalopathy;
AIDS-related c. (ARC) early manifestations of AIDS in individuals who have not yet developed deficient immune function, characterized by fever with generalized lymphadenopathy, diarrhea, and weight loss.
a-keto acid dehydrogenase c. See a-keto acid dehydrogenase.
amygdaloid c. amygdaloid body
anomalous c. a c. in the electrocardiogram differing significantly from the physiologic type in the same lead.
antigen-antibody c. See immune c.
antigenic c. a composite of different antigenic structures, such as a cell or a bacterium, or, by extension, a molecule containing two or more determinant groups of different antigenic specificities.
apical c. a set of anterior structures that characterize one or several developmental stages of members of the protozoan phylum Apicomplexa; includes the following structures, visible by electron microscopy: polar ring, conoid, rhoptries, micronemes, and subpellicular tubules.
atrial c. p wave in the electrocardiogram.auricular c;
auricular c. atrial c
avian leukosis-sarcoma c. , avian leukemia-sarcoma c. 1. a term applied to a group of transmissible virus-induced diseases of chickens causing sarcoma, myeloblastosis, erythroblastosis, leukosis, osteopetrosis, and lymphomatosis. These agents are closely related viruses (avian leukosis-sarcoma virus) causing prolferation of immature erythroid, myeloid, or lymphoid cells; 2. a division of the RNA tumor viruses (subfamily Oncovirinae) causing the avian leukosis-sarcoma c. of diseases; the viruses are subgrouped according to antigenic characteristics and growth in defined types of tissue culture cells.avian erythroblastosis virus, avian leukosis-sarcoma virus, avian lymphomatosis virus (1) , avian myeloblastosis virus, avian sarcoma virus, fowl erythroblastosis virus, fowl lymphomatosis virus, fowl myeloblastosis virus;
binary c. a noncovalent c. of two molecules; often referring to the enzyme-substrate c. in an enzyme-catalyzed reaction. Cf. central c., Michaelis c. enzyme-substrate c;
brain wave c. a specific combination of fast and slow electroencephalographic activity that recurs frequently enough to be identified as a discrete phenomenon.
brother c. Cain c
Cain c. extreme envy or jealousy of a brother, leading to c; [Cain, biblical personage]
castration c. 1. a child's fear of injury to the genitals by the parent of the same sex as punishment for unconcious guilt over oedipal feelings; 2. fantasied loss of the penis by a female or fear of its actual loss by a male; 3. unconscious fear of injury from those in authority.castration anxiety;
caudal pharyngeal c. the ultimobranchial body associated with the embryonic fourth and transitory fifth pharyngeal pouches.
central c. in an enzyme-catalyzed reaction, the structural complex of the enzyme and all of the enzyme's substrates (or the enzyme with all of the enzyme's products) equivalent to the binary c. for a one-substrate enzyme. Cf. binary c., Michaelis c.
charge transfer c. 1. a c. between two organic molecules in which an electron from one (the donor) is transferred to the other (the acceptor), becoming generally distributed throughout the latter; subsequent transfer of a hydrogen atom completes the reduction of the acceptor; such c.'s are generally highly colored and may be so observed; 2. a network of hydrogen bridges at the catalytic center of certain proteases.charge transfer system;
Diana c. ideas leading to the adoption of masculine traits and behavior in a female. [Diana, L. myth. char.]
diphasic c. a c. consisting of both positive and negative deflections.
EAHF c. a combination of allergies consisting of eczema, asthma and hay fever.
Eisenmenger's c. the combination of ventricular septal defect with pulmonary hypertension and consequent right-to-left shunt through the defect, with or without an associated overriding aorta.Eisenmenger's defect, Eisenmenger's disease, Eisenmenger's tetralogy;
Electra c. female counterpart of the Oedipus c. in the male; a term used to describe unresolved conflicts during childhood development toward the father which subsequently influence a woman's relationships with men.father c; [Electra, daughter of Agamemnon]
electrocardiographic c. a deflection or group of deflections in the electrocardiogram.
enzyme-substrate c. binary c
equiphasic c. isodiphasic c
father c. Electra c
feline leukemia-sarcoma virus c. viruses from cats that induce transmissible leukemia or transmissible fibrosarcoma in kittens.
femininity c. in psychoanalysis, the unconscious fear, in boys and men, of castration at the hands of the mother with resultant identification with the aggressor and envious desire for breasts and vagina.
Ghon's c. Ghon's tubercle
Golgi c. Golgi apparatus
H-2 c. term that denotes genes of the major histocompatibility c.
histocompatibility c. a family of fifty or more genes on the sixth human chromosome that code for cell surface proteins and play a role in the immune response.Histocompatibility genes control the production of proteins on the outer membranes of tissue and blood cells, especially lymphocytes, and are vital elements in cell-cell recognition. The proteins also determine the level and type of immune response, and may serve other biochemical or immunologic functions. In the case of allografts, it is necessary to determine whether donor and recipient possess compatible sets of proteins (histocompatibility antigens), to minimize the likelihood of rejection. Histocompatibility testing (HLA tissue typing) provides this information.
HLA c. the major histocompatibility c. in humans. See also human lymphocyte antigens, under antigen.
immune c. antigen combined with specific antibody, to which complement may also be fixed, and which may precipitate or remain in solution. Frequently associated with autoimmune disease.
inferiority c. a sense of inadequacy which is expressed in extreme shyness, diffidence, or timidity, or as a compensatory reaction in exhibitionism or aggressiveness.
iron-dextran c. a colloidal solution of ferric hydroxide in c. with partially hydrolyzed dextran; used in the treatment of iron deficiency anemias by intramuscular injection.
isodiphasic c. a diphasic c. whose positive and negative deflections are approximately equal.equiphasic c;
j-g c. juxtaglomerular c
Jocasta c. a mother's libidinous fixation on a son. [Jocasta, mother and wife of Oedipus]
junctional c. the attachment zone between epithelial cells, typically consisting of the zonula occludens, the zonula adherens, and the macula adherens (desmosome).
juxtaglomerular c. a c. consisting of the juxtaglomerular cells, which are modified smooth muscle cells in the wall of the afferent glomerular arteriole and sometimes also the efferent arteriole; extraglomerular mesangium lacis cells, which are located in the angle between the afferent and efferent glomerular arterioles; the macula densa of the distal convoluted tubule; and granular epithelial peripolar cells located at the angle of reflection of the parietal to the visceral capsule of the renal corpuscle; believed to provide some feedback control of extracellular fluid volume and glomerular filtration rate.j-g c., juxtaglomerular apparatus;
K c. high amplitude, diphasic frontocental slow waves in the electroencephalogram related to arousal from sleep by a sound; characteristic of sleep stages 2, 3, and 4.
a-ketoglutarate dehydrogenase c. a-ketoglutarate dehydrogenase
Lear c. a father's libidinous fixation on a daughter. [Lear, Shakespearean character]
MAC c. membrane attack c
major histocompatibility c. (MHC) a group of linked loci, collectively termed H-2 c. in the mouse and HLA c. in humans, that codes for cell-surface histocompatibility antigens and is the principal determinant of tissue type and transplant compatibility. See also human lymphocyte antigens, under antigen.
membrane attack c. (MAC) a c. of complement components (C5-C9) that, when activate, bind to the membrane of a target cell, penetrating it with a hydrophobic residue exteriorly and a hydrophilic residue in the interior of the cell; this allows passage of ions and water, swelling of the cell and its eventual rupture.MAC c;
Meyenburg's c. clusters of small bile ducts occurring in polycystic livers, separate from the portal areas.
Michaelis c. binary c. of an enzyme.
monophasic c. a c. in the electrocardiogram that is entirely negative or entirely positive.
mother superior c. the tendency of a psychotherapist to play a mothering role to the detriment of the therapeutic process.
multienzyme c. a structurally distinct and ordered collection of enzymes, often catalyzing successive steps in a metabolic pathway (e.g., pyruvate dehydrogenase c.).
Oedipus c. a developmentally distinct group of associated ideas, aims, instinctual drives, and fears generally observed in male children 3 to 6 years old: coinciding with the peak of the phallic phase of psychosexual development, the child's sexual interest is attached primarily to the parent of the opposite sex and is accompanied by aggressive feelings toward the parent of the same sex; in psychoanalytic theory, it is replaced by the castration c. [Oedipus, G. myth. char.]
ostiomeatal c. point where the frontal and maxillary sinuses normally drain into the nasal cavity; obstruction produces inflammation of affected sinus cavities.ostiomeatal unit;
persecution c. a feeling that others have evil designs against one's well-being.
primary c. the typical lesions of primary pulmonary tuberculosis, consisting of a small peripheral focus of infection, with hilar or paratracheal lymph node involvement.
pyruvate dehydrogenase c. See pyruvate dehydrogenase.
QRS c. portion of electrocardiogram corresponding to the depolarization of cardiac cells.
ribosome-lamella c. a cylindrical cytoplasmic inclusion composed of concentrically arranged sheets of membranes alternating with rows of ribosomes; characteristic of the hairy cell in leukemic reticuloendotheliosis.
Shone's c. an obstructive lesion of the mitral valve c. with left ventricular outflow obstruction and coarctation of the aorta.
sicca c. dryness of the mucous membranes, as of the eyes and mouth, in the absence of a connective tissue disease such as rheumatoid arthritis.
spike and wave c. a generalized, synchronous pattern seen on the electroencephalogram, consisting of a sharply contoured fast wave followed by a slow wave; particularly found in patients with generalized epilepsies. Spike and wave complexes are often characterized by their frequency, e.g., s low spike and wave, fast spike and wave.
superiority c. term sometimes given to the compensatory behavior, e.g., aggressiveness, self-assertion, associated with inferiority c.
symptom c. 1. See syndrome. 2. See complex (1).
synaptinemal c. a submicroscopic structure interposed between the homologous chromosome pairs during synapsis.synaptonemal c;
synaptonemal c. synaptinemal c
Tacaribe c. of viruses a group of arenaviruses that includes the antigenically interrelated arboviruses Amapari, Junin, Latino, Machupo, Parana, Pichinde, Tacaribe, and Tamiami.
ternary c. term used to describe the tripartite combination of, for example, enzyme-cofactor-substrate or enzyme-substrate1-substrate2 for a multisubstrate enzyme, the active form involved in many enzyme-catalyzed reactions.
triple symptom c. Behçet's syndrome
VATER c. a constellation of vertebral defects, anal atresia, tracheoesophageal fistula with esophageal atresia, and renal and radial anomalies; associated with Fanconi's anemia.
ventricular c. the continuous QRST waves of each beat in the electrocardiogram.


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