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 ?
To allow drivers and signallers to train to use GSM-R, simulators replicating the cab radio and signalling system will be rolled out across the country later in the year.
The organisation has 6,000 signallers of which 4,556 were balloted.
Geraint was subjected to a vile torrent of sexual demands by the captain who had caught the young signaller on the base after "lights out" last summer.
DOOMED RAF Dakota NOT FORGOTTEN From left, signaller Tom O'Toole, Service Corps driver Roy Wilson, navigator Geoff Carpenter, driver Oliver Goldsmith and Cpl Phil Bryant HONOURED RAF ceremony yesterday SCENE Crash site in jungle
Signaller Craig Billins said: "S-J was one of my most devoted friends.
Network Rail yesterday confirmed that the driver had failed to follow written instructions on the "user-worked" crossing, whereby drivers are told to ring a signaller who tells them if it is safe to cross.
Network Rail have confirmed that the driver had failed to follow written instructions on the "userworked" crossing, whereby drivers are told to ring a signaller who tells them if it is safe to cross.
ATLANTA -- Serologicals Corporation (NASDAQ: SERO) today announced that Upstate Group, its wholly owned subsidiary, is sponsoring the Upstate Young Cell Signaller Award for 2005.
FATHER-of-one Signaller Ian Sartorius-Jones was last night named as the latest British victim from the Afghan front line.
The soldiers, Trooper Martin Semple, 23, from Holmfirth, and Signaller Tom Myzak, 26, from Golcar, were joined by Sgt Aaron Downey of The Yorkshire Regiment recruiting team.
The Prince spotted the Welsh rug by shirt of James Cottrell,nine,from Wirral, whosed ad Dave, 37, is a signaller.
Signaller Christopher Parker of 2 Signals Regiment has been working as a radio systems operator which involves ensuring vital communications run smoothly.