| blue dextran | High molecular weight dextran containing a blue chlorotriazine dye, Cibacron Blue; used to measure the void volumes in gel filtration columns. (05 Mar 2000) |
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| blue disease | <infectious disease> An acute febrile (feverish) disease initially recognised in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. The disease is characterised by sudden onset of headache, chills and fever which can persist for 2-3 weeks, muscle pain. A characteristic rash appears on the extremities and trunk about the 4th day of illness. The rickettsiae grow within damaged cells lining blood vessels which may become blocked by clots. Blood vessel inflammation (vasculitis) is widespread Early recognition of the condition and prompt antibiotic treatment is important in reducing mortality. Synonym: spotted fever, tick fever, and tick typhus. (25 Jun 1999) |
| blue dome cyst | Cyst in the breast filled with serum and/or blood. With time they look blue. (16 Dec 1997) |
| blue dot sign | <clinical sign> A blue or black spot visible beneath the skin on the cranial aspect of testis or epididymis. This is a torsed testicular appendage and is usually quite tender. (05 Mar 2000) |
| blue-eye | <zoology> The blue-cheeked honeysucker of Australia. Source: Websters Dictionary (01 Mar 1998) |
| blue-eyed grass | <botany> A grasslike plant (Sisyrinchium anceps), with small flowers of a delicate blue colour. Source: Websters Dictionary (01 Mar 1998) |
| blue fever | An acute tick-borne illness caused by the bacteria Rickettsia rickettsii. The disease is characterised by sudden onset of headache, chills and fever which can persist for 2-3 weeks. A characteristic rash appears on the extremities and trunk about the 4th day of illness. (27 Sep 1997) |
| blue grass | <botany> A species of grass (Poa compressa) with bluish green stems, valuable in thin gravelly soils; wire grass. Kentucky blue grass, a species of grass (Poa pratensis) which has running rootstocks and spreads rapidly. It is valuable as a pasture grass, as it endures both winter and drought better than other kinds, and is very nutritious. Source: Websters Dictionary (01 Mar 1998) |
| blue-green algae | The former name for the blue-green bacteria, now classified as Cyanobacteria. A group of prokaryotes. Synonym: Cyanobacteria. (05 May 2002) |
| blue-green bacteria | <organism> Modern term for the blue green algae, prokaryotic cells that use chlorophyll on intracytoplasmic membranes for photosynthesis. The blue green colour is due to the presence of phycobiliproteins. Found as single cells, colonies or simple filaments. In Anabaena, in which the cells are arranged as a filament, heterocysts capable of nitrogen fixation occur at regular intervals. According to the endosymbiont theory Cyanobacteria are the progenitors of chloroplasts. (18 Nov 1997) |
| blue-green bacterium | <organism> Modern term for the blue green algae, prokaryotic cells that use chlorophyll on intracytoplasmic membranes for photosynthesis. The blue green colour is due to the presence of phycobiliproteins. Found as single cells, colonies or simple filaments. In Anabaena, in which the cells are arranged as a filament, heterocysts capable of nitrogen fixation occur at regular intervals. According to the endosymbiont theory Cyanobacteria are the progenitors of chloroplasts. (18 Nov 1997) |
| blue jay | <zoology> The common jay of the United States (Cyanocitta, or Cyanura, cristata). The predominant colour is bright blue. Source: Websters Dictionary (01 Mar 1998) |
| blue line | A bluish line along the free border of the gingiva, occurring in chronic heavy metal poisoning. (05 Mar 2000) |
| blue naevus | <dermatology> A nonmalignant accumulation of highly pigmented melanocytes deep in the dermis. (16 Dec 1997) |
| blue nevus | A dark blue or blue-black nevus covered by smooth skin and formed by heavily pigmented spindle-shaped or dendritic melanocytes in the reticular dermis. Synonym: Jadassohn-Tieche nevus. (05 Mar 2000) |