| paracentric inversion | A basic type of chromosome rearrangement. A segment that does not include the centromere (and so is paracentric) has been snipped out of a chromosome, turned through 180 degrees (inverted), and inserted right back into its original location in chromosome. (12 Dec 1998) |
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| visceral inversion | A transposition of the viscera, e.g., the liver developing on the left side or the heart on the right. Synonym: visceral inversion. (05 Mar 2000) |
| pericentric inversion | <cell biology, genetics> Chromosomal inversion in which the region that is inverted includes the kinetochore. (18 Nov 1997) |
| short TI inversion recovery | An inversion recovery sequence that uses a short inversion time, about 100 ms., between 180 |
| inversion | 1. The act of inverting, or turning over or backward, or the state of being inverted. 2. <mathematics> A change in the order of the terms of a proportion, so that the second takes the place of the first, and the fourth of the third. 3. <genetics> An aberration in which a chromosomal segment is deleted and reinserted in the same place but turned 180 degrees from its original orientation, so that the gene sequence for the segment is reversed with respect to that of the rest of the chromosome. 4. <geometry> A peculiar method of transformation, in which a figure is replaced by its inverse figure. Propositions that are true for the original figure thus furnish new propositions that are true in the inverse figure. See Inverse figures, under Inverse. 5. Said of intervals, when the lower tone is placed an octave higher, so that fifths become fourths, thirds sixths, etc. Said of a chord, when one of its notes, other than its root, is made the bass. 6. <geology> The folding back of strata upon themselves, as by upheaval, in such a manner that the order of succession appears to be reversed. 7. <chemistry> The act or process by which cane sugar (sucrose), under the action of heat and acids or ferments (as diastase), is broken or split up into grape sugar (dextrose), and fruit sugar (levulose); also, less properly, the process by which starch is converted into grape sugar (dextrose). The terms invert and inversion, in this sense, owe their meaning to the fact that the plane of polarization of light, which is rotated to the right by cane sugar, is turned toward the left by levulose. See: invert. Origin: L. Inversio: cf. F. Inversion. Source: Websters Dictionary (04 Jul 1999) |
| inversion heterozygote | <genetics> Individual in which one chromosome contains an inversion whereas the homologous chromosome does not. (18 Nov 1997) |
| inversion of chromosomes | A chromosome aberration resulting from a double break in a segment of the chromosome, with end for end rotation of the fragment between the fracture lines, and refusion of the fragments; this results in reversal of the order of genes in that segment. (05 Mar 2000) |
| inversion of the uterus | A turning of the uterus inside out, usually following childbirth. (05 Mar 2000) |
| inversion recovery | A magnetic resonance pulse sequence in which a series of 180 |
| uterine inversion | A turning of the uterus inside out, whereby the fundus is forced through the cervix and protrudes into or outside of the vagina. (12 Dec 1998) |
| activated partial thromboplastin time | The time needed for plasma to form a fibrin clot following the addition of calcium and a phospholipid reagent; used to evaluate the intrinsic clotting system. (05 Mar 2000) |
| reaction of partial identity | See: gel diffusion precipitin tests in two dimensions. (05 Mar 2000) |
| partial | 1. Of, pertaining to, or affecting, a part only; not general or universal; not total or entire; as, a partial eclipse of the moon. "Partial dissolutions of the earth." 2. Inclined to favor one party in a cause, or one side of a question, more then the other; baised; not indifferent; as, a judge should not be partial. "Ye have been partial in the law." (Mal. Ii. 9) 3. Having a predelection for; inclined to favor unreasonably; foolishly fond. "A partial parent." "Not partial to an ostentatious display." (Sir W. Scott) 4. <botany> Pertaining to a subordinate portion; as, a compound umbel is made up of a several partial umbels; a leaflet is often supported by a partial petiole. Partial differentials, Partial differential coefficients, Partial differentiation, etc. (of a function of two or more variables), the differentials, differential coefficients, differentiation etc, of the function, upon the hypothesis that some of the variables are for the time constant. <mathematics> Partial fractions, the simple tones which in combination form an ordinary tone; the overtones, or harmonics, which, blending with a fundamental tone, cause its special quality of sound, or timbre, or tone colour. See, also, Tone. Origin: F, fr. LL. Partials, fr. L. Pars, gen. Partis, a part; cf. (for sense 1) F. Partiel. See Part. Source: Websters Dictionary (01 Mar 1998) |
| partial adrenocortical insufficiency | Normal basal adrenocortical function with failure of adrenocortical reserve to respond to ACTH stimulation. (05 Mar 2000) |
| partial agglutinin | Immune agglutinin present in an antiserum in lesser concentration than the major agglutinin. Synonym: partial agglutinin. (05 Mar 2000) |