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 ?
This selection of programmable digital attenuators is available in rugged coaxial packages and offer accurate and controlled levels of attenuation for use in a variety of signal processing applications in RF, microwave, and millimeter-wave systems," explains Brian McCutcheon, Vice President and General Manager at Fairview Microwave.
The new continuously variable waveguide attenuators from Pasternack are offered in 5 unique models covering a broad frequency range of 33 GHz to 110 GHz in five bands.
The magnitudes of the in-phase and quadrature output signals of the input Lange splitter, adjusted with the balanced attenuators, are summed with a simple output Wilkinson combiner, which allows magnitude and phase modulation of the RF carrier.
Using standard methods, we performed polymerase chain reaction (PCR) with a previously published primer set and protocol which amplifies the region of DNA including the 35 box of the AmpC promoter and the 3' end of the attenuator, producing a 271-bp amplicons (5).
Another important element in this noise attenuator design is its conical exterior shape.
Because of the truck-mounted attenuator (TMA), the four people involved in the accident suffered only minor injuries.
The World Nx1 Supplier of MEMS chips for the Optical Communications market releases fully packaged "High Voltage" Electrostatic Variable Optical Attenuator
M2 EQUITYBITES-May 26, 2015-IDT adds three new RF variable attenuator products
The new high precision PIN diode digital attenuators from Pasternack offer fast and reliable switch speeds and high linearity.
The unit is made for use with single mode fibre and can support up to eight fibre optic attenuators in a single 1-wide GP750 module.
Attenuators are used in a wide variety of applications to satisfy almost any requirement where a reduction in power is needed.
The model HMC470LP3 and model HMC472LP4 are GaAs MMIC digital attenuators with TTL/CMOS control, which makes them ideal for wireless.