modulation

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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 ?
Such amplifier configuration was used in order to configure phase modulation of the pump for SBS suppression.
The National Bureau of Standards defines Single Side Band Phase Noise as the ratio of power in one phase modulation sideband per Hertz bandwidth, at an offset f Hertz away from the carrier, to the total signal power.
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).
The commutating switch imposes a phase modulation component on the received signal.
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.
Phase modulation guarantees high resilience against interference and enables code-domain multiple-input, multiple-output (MIMO) radar.
Chapters 5, 6 and 7 describe advanced phase modulation techniques, including minimum shift keying, continuous phase modulation and multi-h phase modulation.
Intrapulse frequency or phase modulation also are used to produce LPI transmission as well as complicating the RF memory problems for the ECM designer.
In long haul and ultra long haul communications, for example, RZ is much more effective due to its high tolerance of non-linear distortions of the self phase modulation (SPM) type.
5 is a standard for continuous phase modulation schemes.