attenuator

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at·ten·u·a·tor

(ă-ten'yū-ā-tŏr, -tōr),
1. An electrical system of resistors and capacitors used to reduce the strength of electrical signals, as in ultrasonography.
2. The terminator sequence in DNA at which attenuation occurs; located between the operator and the gene for the first protein in an operon.

attenuator

[əten′yo̅o̅·ā′tər]
Etymology: L, attenuare, to make thin
an agent that weakens the toxicity of a poisonous substance or the virulence of a microorganism.

attenuator

a regulatory NUCLEOTIDE sequence occurring in the LEADER REGION of an operon (see OPERON MODEL and containing a TRANSCRIPTION stop signal. The attenuator acts as a fine control mechanism for the activity of structural genes, sometimes being operative, sometimes not, depending on conditions in the cell.
References in periodicals archive ?
Our new lines of hot-switchable variable attenuators provide engineers the flexibility to adjust and customize the RF performance of their distributed systems while the system is live", says Greg Arnold, Technical Sales Manager for Fairview Microwave.
The most critical factor affecting long term reliability of a Variable Optical Attenuator is the hermeticity," said Sushil Shah, President & CEO of Lightconnect.
In the ElectroniCast report, the fiber optic attenuator market is presented in segments:
Exar Corporation (Nasdaq: EXAR), a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure, today announced the industry's first standards compliant multi-channel jitter attenuator device for DS3/E3/STS-1 transmission applications.
MOEC's patented Shadow(R) electronic variable optical attenuator features industry-leading insertion loss and backreflection figures, offering system designers economical optical power control solutions without adversely impacting link budgets.
The attenuators use an all-fiber attenuation mechanism, which offers lower reflection and more precise attenuation than approaches using filters or optical misalignment.
Fairview Introduces Five Waveguide Attenuators Allowing Engineers to Test Signals Across Q, U, V and W Bands
As part of these works, the existing fans are to be replaced and new attenuators will be fitted.
Pasternack said it has introduced a new family of in-stock continuously variable waveguide attenuators with performance up to 110 GHz.
a leading manufacturer and supplier of RF, microwave and millimeter wave products, announces the release of their new 5 Bit, 8 Bit and 10 Bit broadband PIN diode digital step attenuators with performance up to 40 GHz depending on the configuration.
Sequencing of the promoters and attenuators indicated that only one had mutations that might have affected the amount of [beta]-lactamase produced.
The fiber-based system used light from a weak coherent laser pulse at 1310 nm to transmit key material and attenuators between the transmitter and receiver to simulate fiber losses over long distances.