RIA |
<investigation, technique> Any system for testing antigen antibody reactions in which use is made of radioactive labelling of antigen or antibody to detect the extent of the reaction. (18 Nov 1997) |
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rib |
1. <anatomy> One of the curved bones attached to the vertebral column and supporting the lateral walls of the thorax. In man there are twelve ribs on each side, of which the upper seven are directly connected with the sternum by cartilages, and are called sternal, or true, ribs. The remaining five pairs are called asternal, or false, ribs, and of these each of the three upper pairs is attached to the cartilage of the rib above, while the two lower pairs are free at the ventral ends, and are called floating ribs. 2. That which resembles a rib in form or use. Specifically: A ridge, fin, or wing, as on a plate, cylinder, beam, etc, to strengthen or stiffen it. One of the rods on which the cover of an umbrella is extended. 3. <botany> The chief nerve, or one of the chief nerves, of a leaf. Any longitudinal ridge in a plant. Origin: AS. Rib, ribb; akin to D. Rib, G. Rippe, OHG. Rippa, rippi, Dan. Ribbe, Icel. Rif, Russ. Rebro. Source: Websters Dictionary (01 Mar 1998) |
rib notching |
A smooth defect in the lower border of one or more upper ribs caused by enlarged intercostal collateral vessels, most often a sign of coarctation of the aorta. (05 Mar 2000) |
riband |
<chemical> Riband jasper, a variety of jasper having stripes of different colours, as red and green. Source: Websters Dictionary (01 Mar 1998) |
Ribas-Torres disease |
A mild form of smallpox. See: variola minor. (05 Mar 2000) |
ribavirin |
<drug, protein> A nucleoside analogue approved as a treatment for respiratory syncytial virus. Ribavirin also has shown activity against hepatitis C, but its use in HIV infection is highly controversial. It is possible that it enhances the activity of ddl. (23 Aug 1998) |
ribbed |
1. <anatomy> Furnished or formed with ribs; as, a ribbed cylinder; ribbed cloth. 2. <chemical> Intercalated with slate; said of a seam of coal. Source: Websters Dictionary (01 Mar 1998) |
Ribbert's theory |
<oncology> That a neoplasm may result when a reduction in tension (exerted by adjacent tissues) leads to conditions favourable to uncontrolled growth of cell rests. (05 Mar 2000) |
Ribbert, Moritz |
<person> German pathologist, 1855-1920. See: Ribbert's theory. (05 Mar 2000) |
ribbing |
<anatomy> An assemblage or arrangement of ribs, as the timberwork for the support of an arch or coved ceiling, the veins in the leaves of some plants, ridges in the fabric of cloth, or the like. (23 Aug 1998) |
ribbon |
1. A fillet or narrow woven fabric, commonly of silk, used for trimming some part of a woman's attire, for badges, and other decorative purposes. 2. A narrow strip or shred; as, a steel or magnesium ribbon; sails torn to ribbons. 3. Same as Rib-band. 4. Driving reins. 5. A bearing similar to the bend, but only one eighth as wide. 6. A silver. The blue ribbon, and The red ribbon, are phrases often used to designate the British orders of the Garter and of the Bath, respectively, the badges of which are suspended by ribbons of these colours. See Blue ribbon, under Blue. Ribbon fish. A tapeworm. A nemertean. Origin: OE. Riban, OF. Riban, F. Ruban, probably of German origin; cf. D. Ringband collar, necklace, E. Ring circle, and band Alternative forms: riband, ribband. Source: Websters Dictionary (01 Mar 1998) |
ribbon arch |
A thin, ribbon-shaped, rectangular orthodontic arch wire applied to the dental arch's so that its widest dimension is parallel to the labial or buccal surfaces of the teeth. (05 Mar 2000) |
ribbon arch appliance |
An appliance consisting of a rectangular wire inserted into a specially designed bracket attached to the labial and buccal surfaces of the teeth. (05 Mar 2000) |
ribbon synapse |
<biology, physiology> Ultrastructurally distinct type of synapse found in a variety of sensory receptor cells such as retinal photoreceptor cells, cochlear hair cells and vestibular organ receptors, as well as in a nonsensory neuron, the retinal bipolar cell. Unlike most neurons, these cells do not use regenerative action potentials but release transmitter in response to small graded potential changes. Ribbon synapses have different exocytotic machinery from conventional synapses in containing dense bars or ribbons anchored to the presynaptic membrane covered with a layer of synaptic vesices. The ribbons have been proposed to shuttle synaptic vesicles to exocytotic sites. (23 Aug 1998) |
ribbonwood |
<botany> A malvaceous tree (Hoheria populnea) of New Zealand, the bark of which is used for cordage. Source: Websters Dictionary (01 Mar 1998) |