| rh | A blood group system and one of the most complex. A person can be said to be rh-positive or rh-negative. Rh stands for rhesus monkeys. (12 Dec 1998) |
|---|---|
| Rh antigens | rh blood group |
| Rh blocking test | A test for nonagglutinating Rh antibodies: an Rh agglutination test is first carried out; if the test for Rh agglutinins is negative, then 1 drop of anti-Rho agglutinating serum of moderate titre is mixed with the patient's serum containing Rh-positive test cells; if after incubating for from 1 to 2 hr at 37캜 no agglutination occurs, Rho-blocking antibodies are assumed to be present in the patient's serum. (05 Mar 2000) |
| rh factor | An antigen that may or may notbe present on the surface of human bloodcells. If a person's blood has the antigen, their blood type ispositive, if they do not, it is negative. The Rh factor isimportant mainly because if a woman who is Rh- conceives a child who is Rh+, themixing of their bloods in the placenta may provoke an immune reaction in the mother that can cause a life-threatening agglutination of the foetus'blood cells.The Rh factor is so named because it was first identified in Rhesus monkeys. See: ABO blood group. (09 Oct 1997) |
| rh isoimmunization | The process by which foetal rh+ erythrocytes enter the circulation of an rh- mother during delivery, causing her to produce IgG antibodies, which can cross the placenta and destroy the erythrocytes of rh- foetuses in subsequent pregnancies. (12 Dec 1998) |
| Rh null syndrome | <syndrome> A lack of all Rh antigens, compensated haemolytic anaemia, and stomatocytosis. (05 Mar 2000) |
| rh-hr blood-group system | Erythrocyte isoantigens of the rh (rhesus) blood group system, the most complex of all human blood groups, because the genes differ by determining a different number of the over thirty antigens thus far described and do so with remarkably different quality. The major antigen rh or d is the most common cause of erythroblastosis foetalis. (12 Dec 1998) |
| rhabarbarine | <chemistry> Chrysophanic acid. Source: Websters Dictionary (01 Mar 1998) |
| rhabarberone | 1,8-dihydroxy-3-(hydroxymethyl)anthraquinone; 3-hydroxymethylchrysazin;the trimethyl ether of emodin; used as a laxative. See: aloin, emodin. Synonym: rhabarberone. (05 Mar 2000) |
| rhabd- | See: rhabdo-. (05 Mar 2000) |
| rhabdiasoidea | A superfamily of intestinal nematode parasites containing one genus, strongyloides, and several species. It is transmitted through faecal material onto the skin and occurs in animals and humans. (12 Dec 1998) |
| rhabdite | 1. <zoology> A minute smooth rodlike or fusiform structure found in the tissues of many Turbellaria. 2. <zoology> One of the hard parts forming the ovipositor of insects. Origin: Gr. "rabdos a rod. Source: Websters Dictionary (01 Mar 1998) |
| rhabditida | An order of nematodes of the subclass secernentea. Its organisms are characterised by an annulated or smooth cuticle and the absence of caudal glands. (12 Dec 1998) |
| rhabditida infections | Infections with nematodes of the order rhabditida. (12 Dec 1998) |
| rhabditiform | See: rhabditiform larva. (05 Mar 2000) |