| acceptable daily intake | <pharmacology> This is an estimate of the amount of a substance in food that can be ingested daily over a lifetime by humans without appreciable health risk. The concept of the acceptable daily intake has been developed principally by who and FAO and is relevant to chemicals such as additives to foods, residues of pesticides and veterinary drugs in foods. Acceptable daily intakes are derived from laboratory toxicity data, and from human experiences of such chemicals when this is available, and incorporate a safety factor. The acceptable daily intake is thus an estimate of the amount of a substance in food that can be ingested over a lifetime by humans without significant risk to health (for contaminants in food and drinking water, tolerable intakes - daily or weekly - are used). See: tolerable daily intake. (15 Jan 1998) |
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| acceptable risk | <statistics> This relates to the potential for suffering disease or injury that will be tolerated by an individual, group, or society in exchange for the benefits of using a substance or process that will cause such disease or injury. Acceptability of risk depends on scientific data, social, economic, and political factors, and on the perceived benefits arising from a chemical or process that creates the risk in question. (15 Jan 1998) |
| acception | Acceptation; the received meaning. "Here the word "baron" is not to be taken in that restrictive sense to which the modern acception hath confined it." (Fuller) Acception of persons or faces, favoritism; partiality. Origin: L. Acceptio a receiving, accepting: cf. F. Acception. Source: Websters Dictionary (01 Mar 1998) |
| acceptor | A compound that will take up a chemical group (e.g., an amine group, a methyl group, a carbamoyl group) from another compound (the donor); under the action of alanine transaminase, l-glutamic acid is an amine donor while pyruvic acid is an amine acceptor. Origin: L. Ac-cipio, pp. -ceptus, to accept (05 Mar 2000) |
| acceptor control | <biochemistry> The regulation of the respiration rate, governed by ADP's ability to be a phosphate group acceptor. (06 May 1997) |
| acceptor RNA | rNA |
| acceptor site | The ribosomal binding site for the aminoacyl-tRNA during protein synthesis. (05 Mar 2000) |
| acceptor splicing site | Boundary between the right end of an intron and the left end of the adjacent exon. Synonym: acceptor splicing site. (05 Mar 2000) |
| acces pernicieux | A series of severe attacks of falciparum malaria, sometimes occurring in apparently mild cases; roughly classified as cerebral and algid. Origin: Fr., pernicious attacks or symptoms (05 Mar 2000) |
| access | 1. A coming to, or near approach; admittance; admission; accessibility; as, to gain access to a prince. "I did repel his letters, and denied His access to me." (Shak) 2. The means, place, or way by which a thing may be approached; passage way; as, the access is by a neck of land. "All access was thronged." 3. Admission to sexual intercourse. "During coverture, access of the husband shall be presumed, unless the contrary be shown." (Blackstone) 4. Increase by something added; addition; as, an access of territory. [In this sense accession is more generally used] "I, from the influence of thy looks, receive Access in every virtue." (Milton) 5. An onset, attack, or fit of disease. "The first access looked like an apoplexy." (Burnet) 6. A paroxysm; a fit of passion; an outburst; as, an access of fury. Origin: F. Acces, L. Accessus, fr. Accedere. See Accede. Source: Websters Dictionary (01 Mar 1998) |
| access opening | 1. A coming to, or near approach; admittance; admission; accessibility; as, to gain access to a prince. "I did repel his letters, and denied His access to me." (Shak) 2. The means, place, or way by which a thing may be approached; passage way; as, the access is by a neck of land. "All access was thronged." 3. Admission to sexual intercourse. "During coverture, access of the husband shall be presumed, unless the contrary be shown." (Blackstone) 4. Increase by something added; addition; as, an access of territory. [In this sense accession is more generally used] "I, from the influence of thy looks, receive Access in every virtue." (Milton) 5. An onset, attack, or fit of disease. "The first access looked like an apoplexy." (Burnet) 6. A paroxysm; a fit of passion; an outburst; as, an access of fury. Origin: F. Acces, L. Accessus, fr. Accedere. See Accede. Source: Websters Dictionary (01 Mar 1998) |
| accessible | <surgery> Refers to tissue that can be approached by a surgical procedure. In surgical oncology it refers to tumours that are not deep in the brain or beneath vital structures. Inaccessible tumours cannot be approached by standard surgical techniques. (06 Oct 1997) |
| accession | 1. A coming to; the act of acceding and becoming joined; as, a king's accession to a confederacy. 2. Increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory. "The only accession which the Roman empire received was the province of Britain." (Gibbon) 3. A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labour, has a right to the part or thing added, or the improvement (provided the thing is not changed into a different species). Thus, the owner of a cow becomes the owner of her calf. The act by which one power becomes party to engagements already in force between other powers. 4. The act of coming to or reaching a throne, an office, or dignity; as, the accession of the house of Stuart; applied especially to the epoch of a new dynasty. 5. <medicine> The invasion, approach, or commencement of a disease; a fit or paroxysm. Synonym: Increase, addition, augmentation, enlargement. Origin: L. Accessio, fr. Accedere: cf. F. Accession. See Accede. Source: Websters Dictionary (01 Mar 1998) |
| accessorius | Synonym: accessory. Origin: L. (05 Mar 2000) |
| accessorius willisii | <anatomy, nerve> The accessory nerve enervates the sternocleidomastoid muscles and the trapezius muscles. Lesions of the eleventh result in drooping of the shoulder and inability to rotate the head away from the affected side. Synonym: cranial nerve XI. (27 Sep 1997) |