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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
In the ElectroniCast study, the market is presented by the following product categories: Fixed (Bulkhead/Plug/Panel Mount and In-Line) and Variable Optical Attenuators (Manually-controlled and Electrically-controlled).
Keywords: Impact Attenuator, EPP, Foam, Formula SAE, Formula Student
The required number of attenuators needed in implementing the feeding network of the sum and difference patterns under different percentage of sharing excitations is reported in Table 2.
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.
India, May 7 -- Newport has introduced a new attenuator design implemented for the popular low-power Photodetectors, Series 818.
For these same reasons, we also employ ROCs as beam attenuators in the measurement system (2) for characterizing the response linearity of detectors used with high-power lasers.
The critical part of the design involves the two identical (I/Q) attenuators.
In batch mode, users can automate the measurement process by controlling the instrument or attenuator under test via the general-purpose interface bus (GPIB).
This made Sam, 22, look for an alternative technology and he adapted attenuators produced by a company called Newlands Scientific.
"With the Optiplex II from Aurora, broadband networks can be easily expanded by adding optical wavelengths without the need to break physical connections or install optical attenuators to realign the optical carrier power levels," said Ron Wolfe, Senior Product Manager for CATV Products for Aurora Networks.
Designed to accommodate and protect nearly any size person--from an unequipped passenger in the 5th percentile of body mass to a fully equipped person in the 95th percentile--the seats employ energy attenuators to absorb collision forces.
Since these conical-profiled noise attenuators are far less bulky and weigh less than the mufflers previously used, they can be elevated even in cyclonic areas for further ground-level noise and radiant-heat reduction.