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

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]
References in periodicals archive ?
The second simulation model was an 8 channel DWDM transmission system with an in-line FOPA, used to estimate how pump phase modulation influences the spectrum of the produced idlers.
Douillard, "Serially concatenated continuous phase modulation for satellite communications,' IEEE Transactions on Wireless Communications, vol.
Both frequency modulation and phase modulation fall under the general category of angle modulation.
The focal length of the lens is 11350 mm, and defects with pure phase modulation n are in the range of R = 0.5-3.5 mm.
In general requirements for phase modulation are high transmission over a wide bandwidth and large tunable phase shift.
The given scheme based on combined orthogonal frequency division multiplexing (OFDM) and phase modulation (OFDM- PM) or frequency modulation (OFDM-FM) alleviates the undesirable effects due to high peak to mean envelope power ratio of OFDM signals.
The delta-sigma ([DELTA][summation]) fractional-N phase-locked loop (PLL) [4] enables phase modulation function when the fractional division ratio is modulated by the base-band signal, simplifying the overall transmitter architecture without requiring digital-to-analog converters (DACs) and RF upconverters [5].
The counterpropagating data produces a cross phase modulation (XPM) which changes a pump power level and produces a constructive and destructive interference at the output.
According to the team of Xinghie Ni, Alexander V Kildishev and Vladimir M Shalaev, this is the thinnest hologram ever made, yet it provides both amplitude and phase modulation in visible wavelengths to generate high resolution, low-noise images.
The microwave signal is generated by a fractional-N frequency synthesizer which also allows frequency and phase modulation. The synthesizer has been partly developed by InnoSenT GmbH (VCO, attenuator, and buffer amplifier) and is specified to have an output power of 8 dBm.
The addition of phase noise to a sinusoidal signal is not linear, but for low levels of phase modulation, it can be treated as though it were.