| Plasmodium ovale | A species that is the agent of the least common form of human malaria; resembles Plasmodium vivax in its earlier stages, but often modifies the cell membrane, causing it to form a fimbriated outline, and often assume an oval shape; Schuffner's dots are abundant and appear early, host cells are normal or only slightly enlarged, and only about 8 to 10 grapelike merozoites are produced; fever is tertian (every 48 hours), and relapses are infrequent. (05 Mar 2000) |
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| valve of foramen ovale | A fold projecting into the left atrium from the margin of the foramen ovale in the foetus; when, with beginning inspiration, the blood pressure within the left atrium increases, the valve closes and its edges become adherent to the margin of the foramen ovale, occluding it. Synonym: valvula foraminis ovalis, falx septi, valve of oval foramen. (05 Mar 2000) |
| venous plexus of foramen ovale | A venous network around the mandibular nerve connecting the cavernous sinus and the pterygoid plexus. Synonym: plexus venosus foraminis ovalis, rete foraminis ovalis. (05 Mar 2000) |
| centrum ovale | The great mass of white matter composing the interior of the cerebral hemisphere; the name refers to the general shape of this white core in horizontal sections of the hemisphere. Synonym: centrum medullare, centrum ovale, medullary centre, semioval centre, Vicq d'Azyr's centrum semiovale, Vieussens' centrum. (05 Mar 2000) |
| Pityrosporum ovale | A species of yeast found in superficial epidermal scales and hair follicles on oily skin, of borderline pathogenicity; may cause seborrheic dermatitis associated with immune deficiency. Synonym: Pityrosporum ovale. (05 Mar 2000) |
| foramen ovale | <anatomy, cardiology> The communication between the two atria of the foetal heart. If it remains open (atrial septal defect), then blood will shunt from left to right. (04 Apr 1998) |
| placental plasmodium | The syncytial outer layer of the trophoblast; site of synthesis of human chorionic gonadotropin. See: trophoblast. Synonym: placental plasmodium, plasmodial trophoblast, plasmodiotrophoblast, syncytial trophoblast, syntrophoblast. Origin: syncytium + trophoblast (05 Mar 2000) |
| plasmodium | <plant biology> Multinucleate mass of protoplasm bounded only by a plasma membrane, the main vegetative form of acellular slime moulds (e.g. Physarum). (31 Dec 1997) |
| Plasmodium aethiopicum | A species of protozoa that is the causal agent of falciparum malaria (malaria, falciparum). It is most prevalent in the tropics and subtropics. (12 Dec 1998) |
| plasmodium berghei | A protozoan parasite of rodents transmitted by the mosquito anopheles dureni. (12 Dec 1998) |
| Plasmodium brazilianum | A species found in New World monkeys of the family Cebidae in northern South America and Panama which can cause mild malaria in humans. (05 Mar 2000) |
| Plasmodium cathemerium | A species that is the cause of a rapidly fatal, anaemia-producing disease in canaries, also infecting sparrows and other passerine birds. (05 Mar 2000) |
| plasmodium chabaudi | A protozoan parasite of rodents transmitted by the mosquito anopheles stephensi. (12 Dec 1998) |
| plasmodium cynomolgi | A protozoan parasite that occurs naturally in the macaque. It is similar to plasmodium vivax and produces a type of malaria similar to vivax malaria (malaria, vivax). This species has been found to give rise to both natural and experimental human infections. (12 Dec 1998) |
| Plasmodium durae | A species that is the cause of an acute and often fatal malaria of young turkeys in Africa. (05 Mar 2000) |