signal

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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 ?
Where any train is operated at 60 mph or faster, a roadway block signal system and an automatic cab signal system with automatic train stop or automatic train control system shall be installed, also known as PTS.
Because our intelligent traffic signal system automatically decreases the power consumption during power failures, agencies who have deployed a low-cost battery backup can maintain full operation of the traffic signal system and video-monitoring for extended periods.
Upgrade wayside signal systems components at all control points, sidings and turnouts between the U.
133123 Systems Engineering for Signal Systems Including Adaptive Control
Traffic signal systems require maintenance of coatings to extend their service lift.
to provide computer-based training (CBT) courseware on railway traffic control signal systems.
ALSTOM has been supplying signal systems and products for more than 95 years to New York City Transit and its predecessors- the BMT, IND and IRT lines.