selectivity
n. state of being picky, choosiness; state of being selective; quality of being able to tune in to one particular frequency while blocking out other unwanted frequencies (Electronics) | ||||
Selectivity definition was found in categories: Computer & Internet(1) Language, Idioms & Slang(1) Science & Technology(5) Medicine(1) Encyclopedia(1)
| Integrated Circuit Terminology |
the difference in removal rate between two material during an etching or CMP process.
| WordNet 2.0 |
Noun
1. the property of being selective
(hypernym) property
| BioProcess International™ Glossary |
separation factor or relative retention.
| Telecommunication Standard Terms |
A measure of the ability of a receiver to discriminate between a wanted signal on one frequency and unwanted signals on other frequencies. (188 )
| Fishery Glossary |
Ability to target and capture fish by size and species during harvesting operations, allowing by-catch of juvenile fish and non-target species to escape unharmed. In stock assessment, conventionally expressed as a relationship between retention and size (or age) with no reference to survival after escapement. See: Retention, Avoidance, Escapement
| Glossary of liquid chromatographic terms |
(a). Same as Separation factor or Relative retention ratio. A thermodynamic factor that is a measure of relative retention of two substances. Fixed by a certain stationary phase and mobile phase composition. a = k'2/k'1.
| RF Electronics |
The measure of a receiver's ability to reject interfering signals at frequencies near the operating frequency.
| Terms and symbols used in pharmacology |
The capacity or propensity of a drug to affect one cell population in preference to others, i.e., the ability of a drug to affect one kind of cell, and produce effects, in doses lower than those required to affect other cells. Selectivity can be measured or described by means of such numbers as the Therapeutic Index, or the Standardized Safety Margin: not infrequently one wishes to express selectivity of drug action with respect to two potentially beneficial effects, or two potentially toxic doses, or two toxic doses, instead of one each.
"Selectivity" is not to be confused with "potency"; a potent drug may be non-selective or a selective drug may be impotent. "Selectivity" is however, a measure of the relative potency of a drug in producing different effects.
Selectivity is generally a desirable property in a drug, e.g., it is desirable that an antibacterial agent affect parasites in doses too small to affect host cells. Sometimes, selectivity of action is virtually precluded by the nature of the drug, e.g., in the case of analogs of hormones that have many target cells or tissues. Sometimes selectivity of action for cells within an organism is not necessarily desirable, as in the case of certain economic poisons, i.e., pesticides, herbicides, rodenticides; even in this case, however, it is desirable to have a drug selective for cells of a particular species, and this criterion can most easily be met by drugs selective for certain cell types in the organisms of the target species.
"Selectivity" and "specificity" are, unfortunately, frequently used as synonyms for each other. They describe separate phenomena, each of which deserves an unambiguous name.
Cf. Specificity, Therapeutic Index.
| Wikipedia English - The Free Encyclopedia |
- Selectivity, the ability to notice/distinguish small differences. Also the words selectiveness, refinement and discrimination are used. Discrimination is also a cultural term.
- Electronic selectivity
- In a database index, a measure for how many records will be retrieved for a given value of an attribute.
- In natural sciences selectivity characterises either how selective reactions occur amongst several pathways which are typical in particular for organic reactions; or selectivity characterises how selective one particular compound is recognized, or bound, by something else, e.g. by a protein, in a supramolecular host-guest complex, or by parts of a sensor. High selectivity is often called specificity.
- Selectivity (pharmacology) in pharmacology it is the preference of a drug for one mechanism of action over others that cause side effects.
| See more at Wikipedia.org... |