| LA | lactic acid; large amount; laser angioplasty; late abortion; late antigen; latex agglutination; left... |
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| LFA | left femoral artery; left frontal craniotomy; left fronto-anterior [fetal position]; leukocyte funct... |
| MSA | major serologic antigen; male-specific antigen; mannitol salt agar; Medical Services Administration;... |
| PA | panic attack; pantothenic acid; paralysis agitans; paranoia; passive aggressive; pathology; patient'... |
| SSAA | sicca syndrome associated antigen A; Sjogren syndrome-associated antigen A; syringomyelia secondary ... |
| functional group | 1. <chemistry> The specific atom that give a biomolecule a specific chemical characteristic. 2. <ecology> This ecological term refers to groups of organisms that obtain energy in similar ways. Autotrophic plants fix energy from sunlight. Fungi and bacteria decompose organic matter. Shredders chew large particles like tree leaves. Scrapers rasp periphyton and microbes from solid surfaces. Collectors filter fine particles from the water or gather them from deposits. (05 Jan 1998) |
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| linkage group | A set of two or more loci that have been shown by linkage analysis to be physically close in the genome but that have not yet been assigned to specific chromosomes. It is rapidly becoming an outmoded term. (05 Mar 2000) |
| llandeilo group | <geology> A series of strata in the lower Silurian formations of Great Britain; so named from Llandeilo in Southern Wales. See Chart of Geology. Source: Websters Dictionary (01 Mar 1998) |
| ludlow group | <geology> A subdivision of the British Upper Silurian lying below the Old Red Sandstone; so named from the Ludlow, in Western England. Source: Websters Dictionary (01 Mar 1998) |
| acetone-insoluble antigen | A diphosphatidyl glycerol that is found in the membrane of Treponema pallidum and is the antigen detected by the Wasserman test for syphilis. (18 Nov 1997) |
| allogeneic antigen | Genetic variations of the same antigens within a given species. (05 Mar 2000) |
| antigen | Virus coded cell surface antigens that appear soon after the infection of a cell by virus, but before virus replication has begun. See: early gene. (18 Nov 1997) |
| antigen-antibody complex | The complex formed by the binding of antigen and antibody molecules. The deposition of large antigen-antibody complexes leading to tissue damage causes immune complex diseases. If the antigen is polyvalent the complex may be insoluble. Immune complexes activate complement through the classical pathway. See: glomerulonephritis, Arthus reaction, type III hypersensitivity. (12 Dec 1998) |
| antigen-antibody reaction | The phenomenon, occurring in vitro or in vivo, of antibody combining with antigen of the type that stimulated the formation of the antibody, thereby resulting in agglutination, precipitation, complement fixation, greater susceptibility to ingestion and destruction by phagocytes, or neutralization of exotoxin. See: skin test. (05 Mar 2000) |
| antigen-binding site | <immunology> In immune network theory, an idiotope, an antigenic site of an antibody that is responsible for that antibody binding to an antigenic determinant (epitope). Also used of the site on a ligand molecule to which a cell surface receptor binds. (18 Nov 1997) |
| antigen-combining site | See: paratope. (05 Mar 2000) |
| antigen excess | In a precipitation test, the presence of uncombined antigen above that required to combine with all of the antibody; precipitation may be inhibited because the presence of excess antigen gives rise to soluble antigen-antibody complexes, in vivo the resultant antigen-antibody interaction in such an antigen excess may give rise to immune complexes, which have a potential to induce cellular damage; such injury underlies the pathologic changes seen in certain immune complex diseases. (05 Mar 2000) |
| antigen interferon | <cytokine> Interferon elaborated by T lymphocytes in response to either specific antigen or mitogenic stimulation. This type II interferon can be produced by recombinant DNA technology and is similar to the interferon secreted by lymphocytes and has antiviral and antineoplastic activity. Synonym: antigen interferon, immune interferon. Pharmacological action: antineoplastic agent, antiviral agents. (20 Sep 2002) |
| antigen p150,95 | A major adhesion-associated heterodimer molecule expressed by human monocytes, granulocytes, nk cells, and some lymphocytes. The alpha subunit is the CD11c antigen (also called leu-m5), a surface antigen expressed on some myeloid cells. The beta subunit is the CD18 antigen (antigens, CD18). The p150,95 antigen has been shown to play an important role in cell-cell and cell-substrate adhesive interactions. (12 Dec 1998) |
| antigen presentation | A cell that carries on its surface antigen bound to MCH Class I or Class II molecules and presents the antigen in this context to T-cells. Includes macrophages, endothelium, dendritic cells and Langerhans cells of the skin. See: MHC restriction, histocompatibility antigens. (18 Nov 1997) |