modulation

(redirected from phase modulation)
Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to phase modulation: frequency modulation, amplitude modulation

modulation

 [mod″u-la´shun]
the normal capacity of cell adaptability to its environment.
antigenic modulation the alteration of antigenic determinants in a living cell surface membrane following interaction with antibody.

mod·u·la·tion

(mod'yū-lā'shŭn),
1. The functional and morphologic fluctuation of cells in response to changing environmental conditions.
2. Systematic variation in a characteristic (for example, frequency, amplitude) of a sustained oscillation to code additional information.
3. A change in the kinetics of an enzyme or metabolic pathway.
4. The regulation of the rate of translation of mRNA by a modulating codon.
[L. modulor, to measure off properly]

modulation

/mod·u·la·tion/ (mod″u-la´shun)
1. the act of tempering.
2. the normal capacity of cell adaptability to its environment.
3. embryologic induction in a specific region.

antigenic modulation  the alteration of antigenic determinants in a living cell surface membrane following interaction with antibody.
biochemical modulation  in combination chemotherapy, the use of a substance to modulate the negative side effects of the primary agent, increasing its effectiveness or allowing a higher dose to be used.

modulation

[mod′yəlā′shən]
an alteration in the magnitude or any variation in the duration of an electrical current. Modulation, which affects physiological responses to various waveforms, may be continuous, interrupted, pulsed, or surging.

modulation

The regulation of the rate at which a specific gene is transcribed.

mod·u·la·tion

(mod'yŭ-lā'shŭn)
1. The functional and morphologic fluctuation of cells in response to changing environmental conditions.
2. Systematic variation in a characteristic (e.g., frequency, amplitude) of a sustained oscillation to code additional information.
3. A change in the kinetics of an enzyme or metabolic pathway.
4. The regulation of the rate of translation of mRNA by a modulating codon.
5. Change in parameters of electrotherapy (e.g., frequency, amplitude).
[L. modulor, to measure off properly]

modulation

the capacity to regulate; widely used in biology, e.g. modulation of immune responses, food intake, etc.

antigenic modulation
the alteration of antigenic determinants in a living cell surface membrane following interaction with an antibody.
covalent modulation
activation or inactivation of enzymes, either by phosphorylation/dephosphorylation or by proteolytic cleavage. A major means of regulation of enzyme action by hormones.
References in periodicals archive ?
It is a method of phase modulation for digital signals, in which 2 bits of data are allocated to each of 4 modulated optical phases (0 degrees, 90 degrees, 180 degrees and 270 degrees).
Selective Phase Modulation of NiSi Using N-Ion Implantation for High Performance Dopant- Segregated Source/Drain n-Channel MOSFETs - Investigates dual phase-modulated Ni silicide for reducing the Schottky barrier and series resistance in dopant-segregated source/drain nMOSFETs.
Digital technologies such as P25 Phase II employ phase modulation techniques (H-CPM) where any added phase noise from the generator can cause erroneous measurements, especially when determining the digital sensitivity of the receiver using Bit Error Rate (BER) calculations, said Rob Barden, Director of Product Marketing for Radio Test Systems at Aeroflex.