| positive rays | Those originating in a gas discharge tube and moving in a direction opposite to that of cathode ray's; made up of positively charged ions. Synonym: positive rays. (05 Mar 2000) |
|---|---|
| positive scotoma | A scotoma that is perceived as a black spot within the field of vision. (05 Mar 2000) |
| positive stain | <technique> Direct binding of a dye with a tissue component to produce contrast; in electron microscopy, heavy metals like uranyl and lead salts are used to bind to selective cell constituents to produce increased density to the electron beam, i.e., contrast. (05 Mar 2000) |
| positive supporting reactions | Consisting of those reflex muscular contractions whereby the body is supported against gravity; seen in an exaggerated form in the decerebrate animal, negative supporting reaction's, consisting of inhibition of the extensor muscles and unfixing of the joints which thus enable the limb to be flexed and moved into a new position. Synonym: supporting reflexes. (05 Mar 2000) |
| positive taxis | The attraction of protoplasm toward a stimulus. (05 Mar 2000) |
| positive thermotaxis | Attraction of a plant or animal to heat. (05 Mar 2000) |
| positive transference | Transference characterised by predominantly friendly, respectful, and positive feelings on the part of the patient toward the analyst. (05 Mar 2000) |
| intermittent positive-pressure breathing | Application of positive pressure to the inspiratory phase of spontaneous respiration. See: controlled mechanical ventilation (12 Dec 1998) |
| intermittent positive-pressure ventilation | Application of positive pressure to the inspiratory phase when the patient has an artificial airway in place and is connected to a ventilator. See: controlled mechanical ventilation (12 Dec 1998) |
| t-lymphocytopenia, idiopathic CD4-positive | Reproducible depletion of CD4+ lymphocytes below 300 per cubic millimeter in the absence of HIV infection or other known causes of immunodeficiency. This is a rare, heterogeneous syndrome and does not appear to be caused by a transmissible agent. (12 Dec 1998) |
| eyepiece, positive | <microscopy> An eyepiece in which the real image of the object is formed below the lower lens element, of the eyepiece. (05 Aug 1998) |
| false positive | <statistics> A test result that is read as positive when it is really negative. (27 Sep 1997) |
| false-positive reaction | <statistics> An erroneous or mistakenly positive response. Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (05 Mar 2000) |
| leukaemia, calla-positive | Acute leukaemia in which lymphocytes are positive for the common acute lymphoblastic leukaemia antigen (calla). (12 Dec 1998) |
| acceptor RNA | rNA |