| ALL | <haematology> A rapidly progressing cancer of the blood affecting the type of white blood cell known as lymphocytes. Approximately 650 new cases are diagnosed every year in the UK and it is the most common form of childhood leukaemia. Acronym: ALL Origin: Gr. Haima = blood (11 Nov 1997) |
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| all or none | Consistently total response to any effective stimulus. Synonym: all or none law. (05 Mar 2000) |
| all or none law | Consistently total response to any effective stimulus. Synonym: all or none law. (05 Mar 2000) |
| all souls' day | The second day of November; a feast day of the Roman Catholic church, on which supplications are made for the souls of the faithful dead. Source: Websters Dictionary (01 Mar 1998) |
| all-or-nothing phenomenon | <physiology> Refers to the phenomenon where the strength of a nerve impulse is not dependent on the strength of the stimulus. Instead, there is a threshold level of stimulus strength that must be reached before the nerve will fire an impulse (at full capacity). Below the threshold, the nerve will not fire at all. <cardiology> It also refers to the same phenomenon observed in the heart muscle, which will either contract fully or not at all. <psychology> In studies of behaviour, it refers to the same phenomenon where a behavioural stimulus will either produce a complete response or no response at all. Also called all-or-nothing principle, all-or-none law, all-or-none responsiveness, etc. (15 Nov 1997) |
| all-trans-retinal | The orange retinaldehyde resulting from the action of light on the rhodopsin of the retina, which converts the 11-cis-retinal component of the rhodopsin to all-trans-retinal plus opsin. Synonym: trans-retinal, visual yellow. (05 Mar 2000) |
| allachesthesia | A condition in which a tactile sensation is referred to a point other than that to which the stimulus is applied. See: allochiria. Origin: G. Allache, elsewhere, + aisthesis, sensation (05 Mar 2000) |
| allanite | <chemical> A silicate containing a large amount of cerium. It is usually black in colour, opaque, and is related to epidote in form and composition. Origin: From T. Allan, who first distinguished it as a species. Source: Websters Dictionary (01 Mar 1998) |
| allantiasis | An obsolete term for sausage poisoning due to botulism. Origin: G. Allas (allant-), sausage (05 Mar 2000) |
| allanto- | Allantois; allantoid; sausage. Origin: G. Allas, allantos, sausage (05 Mar 2000) |
| allantoate deiminase | <enzyme> An enzyme that catalyses the conversion of allantoic acid to ureidoglycine, NH3, and CO2. (05 Mar 2000) |
| allantoate permease | <chemical> From saccharomyces cerevisiae Synonym: allantoin permease (26 Jun 1999) |
| allantochorion | Extraembryonic membrane formed by the fusion of the allantois and chorion. (05 Mar 2000) |
| allantoenteric diverticulum | An endoderm-lined outpouching of the hindgut (in humans, the yolk sac of a very young embryo) representing the primordium of the allantois; in most amniotes, it grows into the extraembryonic celom; in humans, the distal part of the allantoic lumen is rudimentary, not extending beyond the body stalk. Synonym: allantoenteric diverticulum. (05 Mar 2000) |
| allantogenesis | Formation and development of the allantois. Origin: allanto-+ G. Genesis, origin (05 Mar 2000) |
| stains-all | 4,5,4',5'-Dibenzo-3,3'-diethyl-9-methylthiocarbocyanine bromide;a dye that stains phosphoproteins blue, proteins red, nucleic acids purple, and mucoproteins and mucopolysaccharides various colours on acrylamide gels; also used on tissue sections. (05 Mar 2000) |
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