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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 ?
Agilent MXG signal generators also provide the fastest switching speeds available on the market today, enabling a dramatic increase in throughput.
The digitization of consumer entertainment is opening a new performance vista for manufacturers of advanced audio/video equipment, but it is also introducing challenges and unforeseen layers of complexity that require an intimate knowledge of analog and mixed-signal technology," said John Hussey, ADI vice president for High-Speed Signal Processing.
5 Special signals; 5 groups of signals for blind signaling.
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.
Demolition companies that level buildings with explosive charges--and so are called blasters--have been letting the team plant transmitters in the ill-fated structures and then monitor signals as the buildings go down.
This mechanism reduces interrupt servicing latency as well as eliminates interrupt signal lines on the printed circuit board.
Two decoys can make the signal even harder to steal.
The device performs signal fan-out, loop back and protection switching, and can regenerate signals otherwise compromised by losses in the transmission medium.
The ATS solution, using VQT software, provides the analog or optional cellular interface, together with the voice quality measurement and analysis tools that service providers need to ensure clear voice signals over any type of network.
Many environments bend and bounce signals around so much that they become severely distorted.
Perhaps the installation of a traffic signal at Satsuma would reduce the standard motorist speed and give those of us in the neighborhood another street to turn onto Magnolia from.