signal


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Related to signal: Analog signal

sig·nal

(sig'năl),
1. Something that causes an action or conveys information.
2. A DNA template sequence that alters RNA polymerase transcription.
3. The end product observed when a specific sequence of DNA or RNA is deleted by some method.
4. The message transmitted on binding of an agonist to a receptor.

signal

(sĭg′nəl)
n.
Biology A physical entity, such as a chemical or an electromagnetic wave, that activates a cell receptor and elicits a specific response.
v. sig·naled, sig·naling, sig·nals or sig·nalled or sig·nalling
v.tr.
To cause an effect in (a cell) by the activation of a receptor, as by a neurotransmitter or hormone.

sig′nal·er, sig′nal·ler n.

signal

A measurable or recognisable indicator of an event or process.

signal

Medtalk A measurable or recognizable indicator of an event or process. See Magnetic resonance signal, Sexual body signal.

sig·nal

(sig'năl)
1. Something that causes an action.
2. A DNA template sequence that alters RNA polymerase transcription.
3. The end product observed when a specific sequence of DNA or RNA is deleted by some method.
4. Anything or action that communicates something.

signal

1. audible or visible indications to animals in behavioral conditioning. Many signals have had long-term use in the animal world and are used worldwide. Whoa and Getup, Heel and Sit are common examples. Getawayback is perhaps more colloquial. Many sheepdogs are trained to react to whistles and performing animals are usually trained to react to gestures with the hand.
2. in biochemical terminology relates to staging in reactions; see signal sequence.

signal peptidase
an integral membrane protein located on the luminal surface of the endoplasmic reticulum that cleaves the signal peptide and frees the protein for folding and export.
signal recognition particle (SRP)
a particle composed of six different proteins and one small (7S) RNA that binds to the signal peptide as it emerges from the ribosome, temporarily halting the synthesis of the protein while the complex is transported to the endoplasmic reticulum where the SRP recognizes and docks to a docking protein located on the cytoplasmic surface followed by the transfer of the ribosome to a ribosome receptor on the membrane; the SRP and its docking protein are released from the ribosome and translation resumes.
signal transduction proteins
proteins which may be a protein kinase, an ion channel forming protein (as in nerve cells), or a protein that undergoes some energy dependent change in which the energy is supplied by the hydrolysis of a higher energy compound such as guanosine triphosphate.
References in periodicals archive ?
4 Vehicle signal groups; 6 pedestrian signal groups; 2 tram signal groups; 4 turn signal groups;
Former Mayor James Hahn made increasing the number of left-turn signals one of the priorities in what was otherwise considered an anemic transportation policy, and three years ago the city set out to step up its efforts to bring more signals on line.
This is some of the first work that's been done on how signals propagate through rubble," says Dereck Orr, NIST's manager for public-safety-communications standards.
The coach may also have a signal for pitchouts, and he can even factor in the location of the pitches.
Because the telephone network was built primarily for voice applications, the emphasis has always been on the transmission of real time voice signals across the network.
His challenge was to devise computer models of ocean acoustics that would make it possible to take signals received at underwater listening posts and trace them back to their sources--for instance, enemy submarines.
Gallagher said that according to Vehicle Code 21456, pedestrians are supposed to cross a street only when the pedestrian signal that shows a white walking person symbol or the ``Walk'' sign turns on.
De-emphasis is a commonly used technique for transmitting electrical signals at gigabit data rates to compensate for losses caused by PC board and backplane traces.
Protocol Analyzers can cause serious problems trying to tap into the bus, so most analyzers for 3Gb SAS/SATA don't tap, but instead will receive and retransmit by terminating the incoming signal and then retransmit a new clean version of it again.
They were reminiscent of the strong signal that scientists at Ohio State University in 1977 picked up in the constellation Sagittarius.
The LeCroy SDA family of products, built on the world's fastest real-time oscilloscope architecture, delivers outstanding real-time measurement solutions for signals with data rates up to 10 Gb/s.
Thus it is most apparent in parallel busses where multiple adjacent lines may be switching in the same direction at the same time and inject a noise voltage onto a victim signal.