modulation

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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 ?
centers around the ISDB-T demodulation standard which is widely adopted in South America and Japan.
No other multi-standard PC TV receiver using software demodulation can deliver this kind of quality user experience.
Launched in 2008, FlexiTV targets host processor-based platforms such as notebook PCs, and was the world's first global standards broadcast receiver to leverage the flexibility and cost benefits of software-based demodulation.
This demonstration showcases how efficient our ConnX BBE16 DSP is at executing complex algorithms for digital TV demodulation, and how well it pairs with IP from Bwave and Ubiso.
There are now four main standards for digital television (DTV) broadcasting, with some similarities between these standards in audio and video compression, but the demodulation schemes are all different," said Chris Kissel, In-Stat analyst.
The Fixed WiMAX test options, for RF measurements and demodulation, expand the analysis capability of the BTS Master, which already features cable and antenna analysis, spectrum analysis, power meter, interference analysis, Bit Error Rate Tester (BERT), channel scanner, and power monitor.
IDMA Communications will seek to eliminate those limitations by using multi-user detection receiver technology that enables simultaneous demodulation of multiple, interfering digital signals.
antennas) along with the traditional time dimension in modulation and coding at the transmitter, and demodulation and decoding at the receiver in order to improve the performance of wireless links.
PnpNetwork, since its founding in October 2000, has developed demodulation chips specifically designed for European Terrestrial Digital Broadcasting System that have been shipped to customers both at home and abroad, following the successful development of the demodulation chips for Digital Broadcasting System.
Auvitek designs high-performance yet cost-effective DTV/HDTV demodulation processors and provides multimedia solutions for the fast-growing digital television market.
Nasdaq:SLAB) today announced the acquisition of Silembia, a privately held company based in Rennes, France that develops semiconductor intellectual property for digital demodulation and channel decoding.
The PW3510 and PW3515 ICs integrate a video IF demodulator for NTSC, PAL and SECAM standards in addition to the robust sound demodulation and processing, The benefit of including a video IF demodulator is that it reduces system cost by enabling a manufacturer to use a lower cost single-stage tuner without compromising performance.