| per | perineal; periodicity, periodic |
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| malarial periodicity | A clinical rhythmicity reflected in periodic fevers and chills recurring at approximately 48-hour intervals in tertian malaria (Plasmodium vivax or P. Ovale) or at 72-hour intervals in quartan malaria (Periodicity malariae); the rhythm of tertian or 48-hour cycles is frequently modified in malignant tertian or falciparum malaria (P. Falciparum); associated with release of merozoites from red cells during erythrocytic schizogony, although the controlling mechanism for the synchronous release is unknown. (05 Mar 2000) |
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| periodicity | The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants. Origin: Cf. F. Periodicite. Source: Websters Dictionary (01 Mar 1998) |
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| nocturnal periodicity | A circadian rhythm with the periodicity expressed during nighttime hours, as in the night release of microfilariae of the human filaria Wuchereria bancrofti into the peripheral blood; this type of periodicity is found in regions where the vector mosquito is a night-biting species. (05 Mar 2000) |
| subperiodic periodicity | A modified circadian rhythm in which the periodicity is not clearcut, as in certain zoonotic strains of Malayan filariasis caused by Brugia malayi; as in examples of strict filarial periodicity, this response is correlated with the biting habits of the vector insect (mosquito), although the precise mechanism inducing this microfilarial response is not clearly established. (05 Mar 2000) |
| diurnal periodicity | A circadian rhythm with primary expression of the periodicity during daylight hours, as in the release of microfilariae of Loa loa into the peripheral blood during the day, with far fewer released at night; associated with the day-biting habits of the vector, Chrysops species. (05 Mar 2000) |
| filarial periodicity | The circadian rhythm observed in the appearance of filarial microfilariae in the peripheral blood. See: diurnal periodicity, nocturnal periodicity. (05 Mar 2000) |
| lunar periodicity | Any rhythmic phenomenon that follows a lunar or monthly cycle. (05 Mar 2000) |
| malarial | Pertaining to or affected with malaria. (05 Mar 2000) |
| malarial cachexia | Malaria that develops after frequently repeated attacks of one of the acute forms, usually falciparum malaria; it is characterised by profound anaemia, enlargement of the spleen, emaciation, mental depression, sallow complexion, oedema of ankles, feeble digestion, and muscular weakness. Synonym: limnaemia, malarial cachexia. (05 Mar 2000) |
| malarial crescent | The male or female gametocyte(s) of Plasmodium falciparum, whose presence in human red blood cells is diagnostic of falciparum malaria. Synonym: crescent, sickle form. Myopic crescent, a white or grayish white crescentic area in the fundus of the eye located on the temporal side of the optic disk; caused by atrophy of the choroid, permitting the sclera to become visible. Synonym: myopic conus. Sublingual crescent, the crescent-shaped area on the floor of the mouth formed by the lingual wall of the mandible and the adjacent part of the floor of the mouth. (05 Mar 2000) |
| malarial haemoglobinuria | A condition, now uncommon, resulting from Plasmodium falciparum infection (malignant tertian malaria with severe haemolysis); frequently seen in Caucasians after interrupted treatment with quinine. Synonym: blackwater fever, haemoglobinuric fever, West African fever. (05 Mar 2000) |
| malarial knobs | Rounded protrusions of a red blood cell infected with Plasmodium falciparum, responsible for the adhesion of infected red cells to one another and to the endothelium of the blood vessels containing these infected cells; results in capillary blockage responsible for much of the pathology of malignant tertian malaria. (05 Mar 2000) |
| malarial pigment | A dark brown, granular pigment which rotates the plane of polarised light and has other properties similar to formalin pigment; occurs in parasites, such as Plasmodium malariae, around brain capillaries, and in fixed macrophages of spleen, liver, bone marrow, and lymph nodes. See: malarial pigment stain. (05 Mar 2000) |
| malarial pigment stain | <technique> A stain using phloxine-toluidine blue O sequence; malarial pigment and nuclei are bluish, erythrocytes and cytoplasm are red to orange; found in phagocytic cells of the reticuloendothelial system. (05 Mar 2000) |
| malignant tertian malarial parasite | 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) |
| intermittent malarial fever | See: intermittent malaria. (05 Mar 2000) |
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