| alk-1-enyl | The radical of an alkene in which the double bond indicated by "en(e)" is between carbons 1 and 2 (carbon 1 being the radical or "yl" carbon), i.e., R-CH==CH-; sometimes expressed as alk-1-en-1-yl. (05 Mar 2000) |
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| alk-1-enylglycerophospholipid | A phosphatidate in which at least one of the radicals attached to the glycerol is an alk-1-enyl rather than the usual acyl radical (i.e., is derived from an aldehyde rather than an acid, hence the older trivial names phosphatidal and acetal phosphatid(at)e); "plasmenic acid" has been proposed as a name for such phosphatidates. (05 Mar 2000) |
| alkadiene | An acyclic hydrocarbon (alkane) containing two double bonds. (05 Mar 2000) |
| alkadienes | Acyclic branched or unbranched hydrocarbons having two carbon-carbon double bonds. (12 Dec 1998) |
| alkahest | The fabled "universal solvent" of the alchemists; a menstruum capable of dissolving all bodies. Alkahes"tic. Origin: LL. Alchahest, F. Alcahest, a word that has an Arabic appearance, but was probably arbitrarily formed by Paracelsus. Source: Websters Dictionary (01 Mar 1998) |
| alkalaemia | A decrease in H-ion concentration of the blood or a rise in pH, irrespective of alterations in the level of bicarbonate ion. Origin: alkali + G. Haima, blood (05 Mar 2000) |
| alkalamide | <chemistry> One of a series of compounds that may be regarded as ammonia in which a part of the hydrogen has been replaced by basic, and another part by acid, atoms or radicals. Origin: Alkali + amide. Source: Websters Dictionary (01 Mar 1998) |
| alkalescence | 1. A slight alkalinity. 2. The process of becoming alkaline. (05 Mar 2000) |
| alkalescent | 1. Slightly alkaline. 2. Becoming alkaline. (05 Mar 2000) |
| alkali | Origin: F. Alcali, ultimately fr. Ar. Alqali ashes of the plant saltwort, fr. Qalay to roast in a pan, fry. 1. Soda ash; caustic soda, caustic potash, etc. 2. <chemistry> One of a class of caustic bases, such as soda, potash, ammoma, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralising and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue. Fixed alkalies, potash and soda. Vegetable alkalies. Same as Alkaloids. Volatile alkali, ammonia, so called in distinction from the fixed alkalies. Source: Websters Dictionary (01 Mar 1998) |
| alkali denaturation test | A test for haemoglobin F (Hb F), based on the fact that haemoglobins, with the exception of Hb F, are denatured by alkali to alkaline haematin; the test is sensitive to 2% or more Hb F. (05 Mar 2000) |
| alkali disease | A term applied to various animal poisonings of plant and mineral origin in arid regions under the belief that they were caused by the ingestion of alkaline waters; e.g., botulism of wild ducks, caused by feeding on decayed vegetation in nearly dried-up lakes. (05 Mar 2000) |
| alkali earth metal | See: alkaline earth elements. (05 Mar 2000) |
| alkali metal | <chemistry> Any of the highly reactive metals (such as sodium or potassium) found in the first column of the periodic table, these metals act as bases. (13 Nov 1997) |
| alkali reserve | The sum total of the basic ions (mainly bicarbonates) of the blood and other body fluids which, acting as buffers, maintain the normal pH of the blood. (05 Mar 2000) |