reacting substance

См. также в других словарях:

• Slow reacting substance of anaphylaxis — The Slow reacting substance of anaphylaxis or SRS A is a mixture of the leukotrienes LTC4, LTD4 and LTE4. Mast cells secrete it during the anaphylactic reaction, inducing inflammation. [cite web|title= Dorland s Medical Dictionary| url=… …   Wikipedia

• slow-reacting substance — n SLOW REACTING SUBSTANCE OF ANAPHYLAXIS abbr. SRS …   Medical dictionary

• slow-reacting substance of anaphylaxis — n a mixture of three leukotrienes produced in anaphylaxis that causes contraction of smooth muscle after minutes in contrast to histamine which acts in seconds and that is prob. responsible for the bronchoconstriction occurring in anaphylaxis… …   Medical dictionary

• slow reacting substance of anaphylaxis — (= SRS A) Potent bronchoconstrictor and inflammatory agent released by mast cells; an important mediator of allergic bronchial asthma. A mixture of three leukotrienes (LTC4 mainly, LTD4 and LTE4) …   Dictionary of molecular biology

• substance — Stuff; material. SYN: substantia [TA], matter. [L. substantia, essence, material, fr. sub sto, to stand under, be present] alpha s. SYN: reticular s. (1). anterior perforated s. [TA] a region at the base …   Medical dictionary

• Amount of substance — is a standards defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles. It is sometimes referred to as chemical amount. The International System of Units (SI) defines …   Wikipedia

• Powder (substance) — A powder is a dry, bulk solid composed of a large number of very fine particles that may flow freely when shaken or tilted. Powders are a special sub class of granular materials, although the terms powder and granular are sometimes used to… …   Wikipedia

• chain-reacting — /ˈtʃeɪn riæktɪŋ/ (say chayn reeakting) adjective (of a substance) undergoing or capable of undergoing a chain reaction …  

• acid–base reaction — ▪ chemistry Introduction       a type of chemical process typified by the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O; or acetic acid, CH3CO2H) or electrically charged (ions, such… …   Universalium

• factor — 1. One of the contributing causes in any action. 2. One of the components that by multiplication makes up a number or expression. 3. SYN: gene. 4. A vitamin or other essential element. 5. An event, characteristic, or other definable entity that …   Medical dictionary

• SRS-A — Abbreviation for slow reacting substance of anaphylaxis. * * * slow reacting substance of anaphylaxis * * * SRS A abbr slow reacting substance of anaphylaxis * * * slow reacting substance of anaphylaxis …   Medical dictionary