| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
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| R/O | rule out |
| NPRM | Notice of Proposed Rule Making |
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| ATR | against the rule |
| WTR | with the rule |
| prince | 1. The one of highest rank; one holding the highest place and authority; a sovereign; a monarch; originally applied to either sex, but now rarely applied to a female. "Go, Michael, of celestial armies prince." (Milton) "Queen Elizabeth, a prince admirable above her sex." (Camden) 2. The son of a king or emperor, or the issue of a royal family; as, princes of the blood. 3. A title belonging to persons of high rank, differing in different countries. In England it belongs to dukes, marquises, and earls, but is given to members of the royal family only. In Italy a prince is inferior to a duke as a member of a particular order of nobility; in Spain he is always one of the royal family. 4. The chief of any body of men; one at the head of a class or profession; one who is preeminent; as, a merchant prince; a prince of players. "The prince of learning." Prince-Albert coat, a long double-breasted frock coat for men. Prince of the blood, Prince consort, Prince of darkness. See Blood, Consort, and Darkness. Prince of Wales, the oldest son of the English sovereign. <botany> Prince's feather See Pipsissewa. Origin: F, from L. Princeps, -cipis, the first, chief; primus first + capere to take. See Prime, and Capacious. Source: Websters Dictionary (01 Mar 1998) |
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| prince edward island | An island in the gulf of st. Lawrence constituting a province of canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is charlottetown. Discovered by the french in 1534 and originally named ile saint-jean, it was renamed in 1799 in honor of prince edward, fourth son of george III and future father of queen victoria. (12 Dec 1998) |
| Abegg's rule | The tendency of the sum of the maximum positive and maximum negative valence of a particular element to equal 8; e.g., C may have a valence of +4 and -4, O of +6 and -2. Sometimes loosely stated as all atoms have the same number of valences, a consequence of the tendency of valence electron shells to be filled to 8. (05 Mar 2000) |
| American Law Institute rule | A test of criminal responsibility (1962): "a person is not responsible for criminal conduct if at the time of such conduct as a result of mental disease or defect he lacks substantial capacity either to appreciate the wrongfulness of his conduct or to conform his conduct to the requirements of law." (05 Mar 2000) |
| astigmatism against the rule | Astigmatism when the greater curvature or refractive power is in the horizontal meridian. (05 Mar 2000) |
| astigmatism with the rule | Astigmatism when the greater curvature or refractive power is in the vertical meridian. (05 Mar 2000) |
| pair rule gene | <molecular biology> A segmentation gene, expressed sequentially between gap genes and segment polarity genes. In development of Drosophila, a set of about 8 genes that are expressed only in alternate segments (odd or even) of the developing embryo. Loss of function mutants thus lack alternate segments. Examples: even skipped (eve), fushi tarazu (ftz), hairy. (18 Nov 1997) |
| Gibb's phase rule | An expression of the relationships existing between systems in equilibrium: P + V = C + 2, where P is the number of phases, V the variance or degrees of freedom, and C the number of components; it also follows that the variance is, V = C + 2 -P. For H2O at its triple point, V = 1 + 2 -3 = 0, i.e., both temperature and pressure are fixed. Synonym: Gibb's phase rule. (05 Mar 2000) |
| Gloger's rule | The rule or observation that the skin of a warm-blooded animal species tends to become darker in colour towards warmer climates at lower altitudes or lower latitudes, and to become lighter in colour towards colder climates at higher altitudes or higher latitudes. (09 Oct 1997) |
| Goriaew's rule | Rarely used term for a rule of a blood counting field by which it is marked off in a series of squares, some of which are again subdivided into sixteen smaller ones. (05 Mar 2000) |
| Chargaff's rule | In DNA the number of adenine units equals the number of thymine units; likewise, the number of guanine units equals the number of cytosine units. (05 Mar 2000) |
| gt-ag rule | This is the observation that all introns in DNA begin with the nucleotides of GT(guanine, thymine) and end with the nucleotides AG (adenine, guanine). When the DNA is transcribed into RNA, the introns are removed from the RNA by a mechanism which recognises these beginning and ending nucleotides - in the RNA they would be CU (cytosine, uracil) and AC (adenine, cytosine). (09 Oct 1997) |
| Rolleston's rule | The ideal adult systolic blood pressure is 100 plus half the age, whereas the maximal physiologic pressure is 100 plus the age; of historical interest. (05 Mar 2000) |
| Meyer-Overton rule | <anaesthetics> Because inhalation agents act via the lipid-rich CNS cells, anaesthetic potency increases with lipid solubility. (05 Mar 2000) |
| phase rule | An expression of the relationships existing between systems in equilibrium: P + V = C + 2, where P is the number of phases, V the variance or degrees of freedom, and C the number of components; it also follows that the variance is, V = C + 2 -P. For H2O at its triple point, V = 1 + 2 -3 = 0, i.e., both temperature and pressure are fixed. Synonym: Gibb's phase rule. (05 Mar 2000) |
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