| ¿µ¹® | alkali | ÇÑ±Û | ¾ËÄ«¸® |
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| Alk. | 1) Alkalosis 2) Alkali |
|---|---|
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ASN | abstract syntax notation; alkali-soluble nitrogen; American Society of Nephrology; American Society ... |
| ASP | abnormal spinal posture; acute symmetric polyarthritis; African swine pox; aged substrate plasma; al... |
| MAS | magic angle spinning; Manifest Anxiety Scale; maximum average score; McCune-Albright syndrome; mecon... |
| VFA | Volatile Fatty Acids |
|---|---|
| VOC | Volatile Organic Compounds |
| VA | volatile anesthetic |
| VOC | Volatile organic chemicals |
| VSC | Volatile sulfur compounds |
| volatile | 1. Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly. 2. Capable of wasting away, or of easily passing into the aeriform state; subject to evaporation. Substances which affect the smell with pungent or fragrant odors, as musk, hartshorn, and essential oils, are called volatile substances, because they waste away on exposure to the atmosphere. Alcohol and ether are called volatile liquids for a similar reason, and because they easily pass into the state of vapor on the application of heat. On the contrary, gold is a fixed substance, because it does not suffer waste, even when exposed to the heat of a furnace; and oils are called fixed when they do not evaporate on simple exposure to the atmosphere. 3. Light-hearted; easily affected by circumstances; airy; lively; hence, changeable; fickle; as, a volatile temper. "You are as giddy and volatile as ever." (Swift) Volatile alkali. <chemistry> See Essential oils, under Essential. Origin: F. Volatil, L. Volatilis, fr. Volare to fly, perhaps akin to velox swift, E. Velocity. Cf. Volley. Source: Websters Dictionary (01 Mar 1998) |
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| volatile anaesthetic | A liquid anaesthetic that at room temperature volatilises to a vapor which when inhaled is capable of producing general anaesthesia. See: anaesthetic vapor. (05 Mar 2000) |
| volatile fatty acid number | An index of the volatile acid content of a fat; the number of milliliters of 0.1 n KOH required to neutralise the soluble volatile fatty acids in 5 g of fat that has been saponified, acidified to liberate the fatty acids, and then steam-distilled. Synonym: volatile fatty acid number. (05 Mar 2000) |
| volatile mustard oil | CH2==CH-CH2-NCS; volatile mustard CH-allylisosulfocyanate; isothiocyanic allyl ester;obtained from Brassica nigra or produced synthetically; a vesicant, used in 10% solution in 50% alcohol as a counterirritant in neuralgia. Gives mustard its characteristics flavor and aroma. See: mustard oil. Synonym: volatile mustard oil. (05 Mar 2000) |
| volatile oil | A substance of oily consistency and feel, derived from a plant and containing the principles to which the odour and taste of the plant are due (essential oil); in contrast to a fatty oil, a volatile oil evaporates when exposed to the air and thus is capable of distillation; it may also be obtained by expression or extraction; many volatile oil's, identical to or closely resembling the natural oil's, can be made synthetically. Volatile oil's are used in medicine as stimulants, stomachics, correctives, carminatives, and for purposes of flavoring (e.g., peppermint oil). Synonym: ethereal oil. (05 Mar 2000) |
| volatile organic compounds | (VOC) Emissions of non-methane hydrocarbons, measured by standard DEQ methods. (05 Dec 1998) |
| sal volatile | A hydroalcoholic solution containing approximately 2% ammonia and 4% ammonium carbonate and the aromatics: lemon oil, lavender oil, and myristica oil. Used mainly by inhalation to produce reflex stimulation in persons who have fainted or are at risk of syncope. Synonym: sal volatile, smelling salts. (05 Mar 2000) |
| oils, volatile | Oils which evaporate readily. The volatile oils occur in aromatic plants, to which they give odour and other characteristics. most volatile oils consist of a mixture of two or more terpenes or of a mixture of an eleopten (the more volatile constituent of a volatile oil) with a stearopten (the more solid constituent). The synonym essential oils refers to the essence of a plant, as its perfume or scent, and not to its indispensibility. (12 Dec 1998) |
| fatty acids, volatile | Short-chain fatty acids of up to six carbon atoms in length. They are the major end products of microbial fermentation in the ruminant digestive tract and have also been implicated in the causation of neurological diseases in humans. (12 Dec 1998) |
| 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) |
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