| equivalent | Having the same value, neutralising or counterbalancing. Origin: L. Aequivalens, from aequus = equal, valere = to be worth (11 Nov 1997) |
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| equivalent dose | In radiation protection, the absorbed dose averaged over a tissue or organ and weighted for the quality of the radiation of interest. The unit of equivalent dose is the sievert. (05 Mar 2000) |
| equivalent extract | A fluidextract of the same strength, weight for weight, as the original drug. Synonym: valoid. (05 Mar 2000) |
| equivalent form reliability | In psychology, the consistency of measurement based on the correlation between scores on two similar forms of the same test taken by the same individual. See: reliability coefficient. (05 Mar 2000) |
| equivalent temperature | The temperature of a thermally uniform enclosure in which, under still air conditions, a "sizable" black body loses heat at the same rate as in the nonuniform environment. (05 Mar 2000) |
| equivalent weight | The weight in grams of an element that combines with or replaces 1 gram of hydrogen, the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction, the weight of a substance contained in 1 liter of 1 normal solution; a variant of. Synonym: combining weight, equivalent weight. (05 Mar 2000) |
| Joule's equivalent | The dynamic equivalent of heat; the amount of work converted to heat that will raise the temperature of 1 pound of water 1캟 is 778 foot-pounds; in metric units, 1 calorie, which raises 1 gram of water 1캜, equals 4.184 × 107 dyne-centimeters, which equals 4.184 joules. (05 Mar 2000) |
| lethal equivalent | A combination of selective effects that on average have the same impact on the composition of the gene pool as one death; e.g., two carriers at 50% risk of dying would be the lethal equivalent of one carrier at 100% risk, in the population genetics of recessive traits lethal equivalent is expressed as twice the sum of the expected number of deaths ascribable to the genetic load. Expression used of the genetic load of recessive genes in heterozygous state that if in homozygous state would cause death or carry a risk of death. The expected number of deaths from all such genes is expressed in lethal equivalent. (05 Mar 2000) |
| active length-tension curve | The relationship between active isometric tension and preload (rest length) for a contracting muscle. (05 Mar 2000) |
| amplified fragment length polymorphism | <technique> Invented by KeyGene, a Dutch biotech company based in Wageningen, Holland. The technique is now merchandised under licence agreement by Perkin Elmer. Selected markers are amplified in a PCR, which makes amplified fragment length polymorphism an easy and fast tool for strain identification in agriculture, botany, microbiology and animal breeding. Acronym: AFLP (05 Feb 1998) |
| arch length | The amount of space required for the permanent teeth as measured from the mesial aspect of the first molar on one side to the mesial aspect of the first molar on the opposite side, as measured through the contact points along an imaginary line of the dental arch. (05 Mar 2000) |
| arch length deficiency | The difference between the available circumference of the dental arch and that required to accommodate the succedaneous teeth in proper alignment. (05 Mar 2000) |
| available arch length | <dentistry> The amount of space available for the permanent teeth around the dental arch from the first permanent molar on the left to the first permanent molar on the right. (05 Mar 2000) |
| bellows length | <microscopy> The distance from the eye point to the image plane in a photomicrographic apparatus. (05 Aug 1998) |
| bond length | This is the distance between the nuclei of two atoms which have formed bonds with each other. (09 Oct 1997) |