| CTN | calcitonin; clinical trials notification; computer tomography number; continuous noise |
|---|---|
| DN | Deiter's nucleus; dextrose-nitrogen; diabetic neuropathy; dibucaine number; dicrotic notch; dinitroc... |
| ECN | equipment control number |
| FN | false negative; fibronectin; fluoride number |
| Ha | absolution hypermetropia; hafnium; hamster; Hartmann number |
| writhing number | <molecular biology> The number of times the axis of a DNA helix crosses itself while the molecule is in the process of supercoiling. (09 Oct 1997) |
|---|---|
| copy number | The number of molecules of a particular type on or in a cell or part of a cell. Usually applied to specific genes or to plasmids within a bacterium. (18 Nov 1997) |
| Polenske number | The number of milliliters of 0.1 n KOH required to neutralise the nonvolatile fatty acids obtained from 5 g of a saponified fat or oil. (05 Mar 2000) |
| CT number | A normalised value of the calculated X-ray absorption coefficient of a pixel (picture element) in a computed tomogram, expressed in Hounsfield units, where the CT number of air is -1000 and that of water is zero. Synonym: Hounsfield number. (05 Mar 2000) |
| haploid number | <cell biology, genetics> The haploid number is the total number of chromosomes in a single set, such as would be found in a gamete or a haploid somatic cell (such as in fungus or gametophyte plants). In humans, the haploid number would be 23. (09 Oct 1997) |
| Hehner number | The weight or percentage of the nonvolatile fatty acids yielded by 5 g of a saponified fat or oil. Synonym: Hehner value. (05 Mar 2000) |
| saponification number | The number of milligrams of KOH required to saponify 1 g of fat; an approximate measure of the average molecular weight of a fat, with which it varies inversely. Synonym: Koettstorfer number. (05 Mar 2000) |
| Hounsfield number | A normalised value of the calculated X-ray absorption coefficient of a pixel (picture element) in a computed tomogram, expressed in Hounsfield units, where the CT number of air is -1000 and that of water is zero. Synonym: Hounsfield number. (05 Mar 2000) |
| hydrogen number | The quantity of hydrogen that 1 g of fat will absorb; it is a measurement of the amount of unsaturated fatty acids in the fat. See: iodine number. (05 Mar 2000) |
| stoichiometric number | The number associated with a reactant or product participating in a defined chemical reaction; usually an integer. (05 Mar 2000) |
| number | 1. To count; to reckon; to ascertain the units of; to enumerate. "If a man can number the dust of the earth, then shall thy seed also be numbered." (Gen. Xiii. 16) 2. To reckon as one of a collection or multitude. "He was numbered with the transgressors." (Is. Liii. 12) 3. To give or apply a number or numbers to; to assign the place of in a series by order of number; to designate the place of by a number or numeral; as, to number the houses in a street, or the apartments in a building. 4. To amount; to equal in number; to contain; to consist of; as, the army numbers fifty thousand. "Thy tears can not number the dead." (Campbell) Numbering machine, a machine for printing consecutive numbers, as on railway tickets, bank bills, etc. Synonym: To count, enumerate, calculate, tell. Origin: OE. Nombren, noumbren, F. Nombrer, fr. L. Numerare, numeratum. See Number. 1. That which admits of being counted or reckoned; a unit, or an aggregate of units; a numerable aggregate or collection of individuals; an assemblage made up of distinct things expressible by figures. 2. A collection of many individuals; a numerous assemblage; a multitude; many. "Ladies are always of great use to the party they espouse, and never fail to win over numbers." (Addison) 3. A numeral; a word or character denoting a number; as, to put a number on a door. 4. Numerousness; multitude. "Number itself importeth not much in armies where the people are of weak courage." (Bacon) 5. The state or quality of being numerable or countable. "Of whom came nations, tribes, people, and kindreds out of number." (2 Esdras III. 7) 6. Quantity, regarded as made up of an aggregate of separate things. 7. That which is regulated by count; poetic measure, as divisions of time or number of syllables; hence, poetry, verse; chiefly used in the plural. "I lisped in numbers, for the numbers came." (Pope) 8. The distinction of objects, as one, or more than one (in some languages, as one, or two, or more than two), expressed (usually) by a difference in the form of a word; thus, the singular number and the plural number are the names of the forms of a word indicating the objects denoted or referred to by the word as one, or as more than one. 9. <mathematics> The measure of the relation between quantities or things of the same kind; that abstract species of quantity which is capable of being expressed by figures; numerical value. Abstract number, Abundant number, Cardinal number, etc. See Abstract, Abundant, etc. In numbers, in numbered parts; as, a book published in numbers. Origin: OE. Nombre, F. Nombre, L. Numerus; akin to Gr. That which is dealt out, fr. To deal out, distribute. See Numb, Nomad, and cf. Numerate, Numero, Numerous. Source: Websters Dictionary (01 Mar 1998) |
| dibucaine number | A test for differentiation of one of several forms of atypical pseudocholinesterases that are unable to inactivate succinylcholine at normal rates; based upon percent inhibition of the enzymes by dibucaine, normal enzyme has a DN of 75 and above, heterozygous atypical enzyme has a DN of 40-70, and homozygous atypical enzyme has a DN of less than 20. See: fluoride number. (05 Mar 2000) |
| dominance threshold number | The number at which 50 percent of the total dominance measure for a given stratum is represented by one or more plant species when ranked in descending order of abundance (i.e., from most to least abundant), when this number is immediately exceeded, the dominant species for the stratum are realised. (09 Oct 1997) |
| iodine number | An indication of the quantity of unsaturated fatty acids present in a fat; it represents the number of grams of iodine absorbed by each 100 g of fat. See: hydrogen number. Synonym: iodine value. (05 Mar 2000) |
| oxidation number | The number of electrons necessary to restore an atom in a combined state to its elemental form. (09 Oct 1997) |