| Rummel tourniquet | A tourniquet fashioned by passing an umbilical tape around a vessel and bringing both ends through a short red rubber catheter. The tourniquet can be tightened and secured with a perpendicularly placed haemostat at the end of the catheter farthest from the vessel. (05 Mar 2000) |
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| Dupuytren's tourniquet | An instrument for compression on the abdominal aorta. (05 Mar 2000) |
| tourniquet | <equipment> An apparatus designed for the compression of the vessels of the limb. A loosely applied tourniquet can impede venous blood flow out of the extremity. A tightly applied tourniquet can also impede arterial blood flow into the extremity. (12 Jan 1998) |
| tourniquet poditis | Postischemic acute inflammatory oedema in the foot (or paw), as the result of complete obstruction of the circulation to that member by use of a tourniquet; produced experimentally in animals as a means of evaluating the anti-inflammatory efficacy of drugs. (05 Mar 2000) |
| tourniquet test | See: capillary fragility test, Rumpel-Leede test. (05 Mar 2000) |
| Esmarch tourniquet | A narrow hard rubber tourniquet with a chain fastener. Synonym: Esmarch bandage. (05 Mar 2000) |
| auditory field | The space included within the limits of hearing of a definite sound, as of a tuning fork. (05 Mar 2000) |
| bright field illumination | <microscopy> The method of lighting the specimen with a solid cone of rays. Transmitted bright field illumination is performed by a substage condenser. Reflected bright field illumination is performed by a vertical illuminator. Compare: dark field illumination (05 Aug 1998) |
| bright field imaging | <microscopy> An imaging mode in a transmission electron microscopy that uses only unscattered Electrons to form the image. Contrast in such an image is due entirely to mass-thickness variations in amorphous samples, and may include diffraction contrast in crystalline samples. (05 Aug 1998) |
| bright field microscopy | <technique> Optical microscopy, in which absorption to a great extent and diffraction to a minor extent give rise to the image, as opposed to phase contrast or interference methods of microscopy. (18 Nov 1997) |
| Broca's field | The posterior part of the inferior frontal gyrus of the left or dominant hemisphere, corresponding approximately to Brodmann's area 44; Broca identified this region as an essential component of the motor mechanisms governing articulated speech. Synonym: Broca's area, Broca's field, motor speech centre. (05 Mar 2000) |
| cardioid dark field condenser | <microscopy> A condenser designed with two reflecting surfaces, the first, a spherical surface which reflects the rays to a second, cardioid (heart-shaped) surface. The virtue in such an arrangement is that, if the cardioid surface is of true figure, the lens is both achromatic and aplanatic. It has a limiting numerical aperture of about 1.0. Thus objectives of a greater numerical aperture cannot be used successfully with it. A true cardioid figure is the trace of a point on the circumference of a circle rolling around an equal, fixed circle. (05 Aug 1998) |
| magnetic field | The sphere of influence of a magnet. (05 Mar 2000) |
| magnetic field gradient | In magnetic resonance imaging, a magnetic field that varies with location, superimposed on the uniform field of the magnet, to alter the resonant frequency of nuclei and allow recovery of their spatial position. Synonym: field gradient. (05 Mar 2000) |
| paraboloid dark field condenser | <microscopy> A lens of parabolic shape. The vertex end is ground back so that its focus can be brought into coincidence with the specimen on the slide. A central stop is provided to block the central rays. It is used chiefly for medium- power work. (05 Aug 1998) |