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 ?
Manufacturing Technology of Attenuator: This chapter is mainly divided into three major parts as Development, Analysis and Trends of Attenuator Manufacturing Technology.
Each balanced attenuator consists of four Lange couplers, two in a splitter/combiner pair and two in the reflective attenuators.
Both of these strains had the C to T mutation at position +58 of the attenuator.
In 2011, MEMSCAP released multiple Variable Optical Attenuator dies using electrostatic actuation (ES VOA), operating under high or low voltage.
The product automates fibre optic switches, attenuators or tunable filters.
For example, if a 10-dB attenuator is inserted in the front of a spectrum analyzer, the spectrum analyzer noise figure will increase by 10 dB and the measurement dynamic range will decrease by 10 dB.
MEMSCAP (NYSE Euronext: MEMS) (Paris:MEMS), the leading provider of innovative solutions based on MEMS (micro-electro-mechanical systems) technology, including optical components, today announces it has successfully completed die level reliability testing beyond 200 millions cycles on its Thermally Actuated Variable Optical Attenuators.
A built-in 2-dB mechanical step attenuator maximizes dynamic range over the full frequency range, and an available 1-dB electronic attenuator accommodates up to 3.
The model IMA303 is a surface-mount thick film "T" pad attenuator that is especially suited to RF and microwave applications.
NYSE: A) today announced new compact tunable lasers and a multimode fiber version of its multichannel optical attenuator.
Prequalification are invited for Attenuators, Attenuator Parts And Guardrail
FiberStore's Variable Optical Attenuator dies have been designed to fit most packaging technologies available on the market and in closed loop mode exhibit superior optical power attenuation stability.