Suppression

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suppression

[sə′presh·ən]
(computer science)
Removal or deletion usually of insignificant digits in a number, especially zero suppression.
Optional function in either on-line or off-line printing devices that permits them to ignore certain characters or groups of characters which may be transmitted through them.
(electronics)
Elimination of any component of an emission, as a particular frequency or group of frequencies in an audio-frequency of a radio-frequency signal.

Suppression

 

in genetics, a phenomenon that prevents the appearance of a character resulting from mutation and that causes partial or complete restoration of the normal phenotype.

Intragenic suppression is caused by a second (suppressor) mutation in the same gene in which the first (direct) mutation occurred. Intergenic suppression is caused by a second mutation in other genes that are located at a considerable distance from the suppressed gene. In intragenic suppression, a protein coded by a given gene can reacquire functional activity, although its original structure, in contrast to true reverse mutation, or reversion, is not restored. In intergenic suppression, the normal phenotype may be restored in some cases owing to mutations that permit other means of metabolism which do not require the functioning of the given gene. In other cases, the normal phenotype may be restored as a result of mutations that alter the process by which the genetic information of the mutant gene is realized.

The phenomenon of suppression, first discovered in 1920 by the American geneticist A. H. Sturtevant, is used to study the genetic code and other aspects of molecular genetics.

REFERENCE

Stent, G. Molekuliarnaia genetika. Moscow, 1974. Chapter 6. (Translated from English.)

I. I. TOLSTORUKOV

References in periodicals archive ?
The ARHP is central to the processes of securing legitimacy for menstrual suppression in the biomedical field in the USA, and beyond.
This statement makes clear the ARHP and NPWH position on menstrual suppression from the outset.
In the ARHP and NPWH journal it is clear that the therapeutic or 'medical' role of menstrual suppression is framed as only one of many factors that influence consumer choice, rather than as the primary consideration.
By invoking the concepts of informed choice and patient education in this way, much of the biomedical literature on menstrual suppression pre-empts social critique.
Instead, women described their thought processes and how they assessed the 'risks' of menstrual suppression as simultaneously happening on 'different levels', especially in terms of day-to-day concerns compared to long term planning or desires.
Echoing the study carried out by Fox and Ward (2006) on the use of medical technologies such as Viagra, the process of taking up menstrual suppression produced a range of health identities.
This account demonstrates the similarities of menstrual suppression with women's experiences of Hormone Replacement Therapy.
In biomedical accounts of menstrual suppression the notions of individual and informed choice, as well as consumer rights and responsibilities are continually (and often contradictorily) reiterated in ways that seemingly verify menstrual suppression as being a rational decision for women.
Menstrual suppression products are another option in the arsenal of fertility control, yes, but the manner in which they are being marketed is disconcerting.
Women's individual experiences of, and attitudes about, menstruation play an important role in determining their interest in menstrual suppression and may also affect the level of satisfaction with the method among women who use these products.