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 ?
In our previous work [16], the approach for iterative joint demodulation and decoding by BP was presented based on the graphical model by exploring the flooding schedule.
In the present section the optical metrology basis, the harmony search optimization model, and the frequency guided sequential demodulation process are shown.
Launched in 2008, FlexiTV targets 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.
Part one of this article([dagger]) compared digital demodulation with other demodulation techniques and theoretically explained the method.
FLEET, UK -- Mirics FlexiTV(TM) has become the world's first broadcast TV receiver utilizing software demodulation to comply with the latest NorDig 2.
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offers a rich set of flexible and powerful measurements and displays, including advanced demodulation measurements;
Tenders are invited for TDM Pulse Amplitude Modulation & demodulation Module Crystal Frequency : 8 MHz ; Analog Input Channels : 4 channels Multiplexing : Time Division Multiplexing Modulation : Pulse Amplitude Modulation On Board Analog Signal : 500 Hz, 1 KHz, 2 KHz and 4 KHz (Sine wave synchronized to s amp l i n g pulse) Adjustable amplitude & separate variable DC level) Sampling Rate : 4 sampling signals 32, 40, 50 & 80 KHz/ ch (switch selectable)
1 GHz, 13 GHz, and 20 GHz now provides specialized demodulation hardware and prewritten test routines for six popular wireless system configurations: Fixed and Mobile WiMAX, W-CDMA/HSDPA, cdmaOne, CDMA2000, EVDO, and GSM/GPRS/EDGE.
OKI succeeded in including the three types of modulation and demodulation functions defined by W-OAM, as well as all the voice compression functions in a single device.
Tenders are invited for Supply ofMaster Unit Communication, Panel for TDM,PAM, PWM, PPM, Module for carrier modulation and demodulation, Module for Delta, adaptive delta and sigma delta modulation, Module for analog modulation and demodulation, Module for frequency modulation and demodulation, Module for data formatting/ reformatting experiment, Module for fourier analysis synthesis experiment, Module for DPCM/ADPCM, Module for 4- channel CDMA, Module for PSK, QPSK, MSK etc, DSP Techbook, DSP Trainer (5 user license), PID Controller Trainer etc.
All three models offer optional WCDMA/HSDPA RF measurements and optional IQ demodulation hardware to support WCDMA demodulation.