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 ?
North America bucked the global trend, notching a 7% increase in CMTS and edge QAM revenue in 4Q12 from 3Q12
Consumers' bandwidth demand drives QAM channel and RF port growth
Streamlined Deployment of New QAM Channels: By delivering content digitally to the node, new QAM channels can be added without adjusting the headend RF combining network or re-balancing the HFC plant.
I am excited to work with the QAM team to identify compelling investment opportunities in the public markets.
The LxS-16016 wideband edge QAM (quadrature amplitude modulation) solution is believed to be the industry's first all-digital, carrier grade wideband edge QAM.
An added advantage of the D5 UEQ's increased density is that an operator can choose between Quad Bonding ratios (4 QAM channels per RF port) and Hex Bonding ratios (6 QAM channels per RF port) to be able to mix and match QAM capacity to the network configuration needed on a channel by channel basis.
CommScope's LxS-16016 wideband edge QAM, which CommScope believes to be the industry's first all-digital, carrier grade wideband edge QAM, is a dense, scalable solution that is vital to supporting more of the advanced and next-generation services over HFC (hybrid fiber coax) networks.
The BigBand BME is currently broadly used for QAM modulation of MPEG content required for digital video services such as VOD and switched broadcast.
a global leader in infrastructure solutions for communications networks, will introduce what it believes to be the cable industry's first all-digital, carrier-grade wideband edge QAM (quadrature amplitude modulation) solution--the LxS-16016--during The Cable Show this week.
Infineon and Metalink continuously work to extend the capabilities of QAM VDSL, each making great strides in advancing the technology.
By integrating a QAM interface with an EPON optical network unit, or ONU, a cable operator can easily offer digital TV services without building new video distribution networks.
Carriers which deploy a supercell configuration, one large cell covering a broad geographic region, can easily increase capacity by assigning 16 QAM modulation to users closer to the base station and QPSK modulation to users further from the base station.