signal

(redirected from signals)
Also found in: Dictionary, Thesaurus, Legal, Financial, Idioms, Encyclopedia.
Related to signals: signals intelligence

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 classic literature ?
Even the poor devil who had waved the single despairing signal of distress had lapsed into unconsciousness before he had learned whether it had availed or not.
When those who could had recovered, the entire story had been told to the French commander; but the men were too ignorant to be able to tell him at just what point on the coast the professor and his party had been marooned, so the cruiser had steamed slowly along within sight of land, firing occasional signal guns and scanning every inch of the beach with glasses.
The signal guns of the afternoon before had not been heard by those on shore, it was presumed, because they had doubtless been in the thick of the jungle searching for Jane Porter, where the noise of their own crashing through the underbrush would have drowned the report of a far distant gun.
Then I thought I heard a faint tapping on the wall--the mere ghost of the familiar signal.
On the first occasion I was too skeptical to do more than verify by natural methods the character of the incident; on the second, I responded to the signal after it had been several times repeated, but without result.
The signal had been given, and I did not see Rouletabille appear at the corner of the off-turning gallery.
3 special signals; Three signal groups for reactive signaling.
After decades of resisting left-turn arrows for fear of jamming through-traffic, Los Angeles has quietly launched a campaign to add the signals, which have become a mainstay of newer cities.
They were mapping the effects of the powerful implosion on the signals emitted from a couple of dozen radio transmitters that they had placed in the building before the blasts.
PCI Express enhances reliability by implementing differential pairs for signal lines with greater noise immunity than high-speed parallel busses.
If they believe their kids are too young or inexperienced or simply cannot work together, they may have to call pitches themselves - that is signal them in to the catcher from the dugout.
In the real world, many signals switch out of phase with each other, thus their crosstalk contribution on a given net is also out of phase.