Communication, types signals

All of the mechanisms which have been detailed operate with electric impulses. The communication between signal transmitters and receivers must often allow language modifications to obtain compatibility (24). Electronic cards allow such changes they are serials-port type RS 232, HP-IB, IEEE, — These cards are placed in the complete management unit, i.e., the computer. The access to data and results is allowed by the computer software, which must remain as user friendly as possible. Programs are used as means of dialogue with the system and for calculation. 

The velocities of the propagation of electrical signals that have values from 0.0005 to 40m/s are sufficiently high to facilitate rapid long-distance communication and account for the rapid response phenomena observed in plants. Both the speed of propagation and the duration of action potential depend on the type of external stimulus. 

Arnaudeau S, Macrez-Lepretre N, Mironneau J 1996 Activation of calcium sparks by angiotensin II in vascular myocytes. Biochem Biophys Res Commun 222 809-815 Arnaudeau S, Boittin FX, Macrez N, Lavie JL, Mironneau C, Mironneau J 1997 L-type and Ca2+ release channel-dependent hierarchical Ca2+ signalling in rat portal vein myocytes. Cell... 

Johnston, R.E. (2000) Chemical communication and pheromones The types of chemical signals and the role of the vomeronasal system. In Finger T.E., Silver W.L., and Restrepo D. (Eds.), The Neurobiology of Taste and Smell. Wiley-Liss, New York, pp 101-127. 

Detection devices (also called sensors) are designed to detect a specific type of event (such as smoke, intrusion, etc.). Depending on the type of event they are designed to detect, sensors can be located inside or outside of the facility or other asset. When an event is detected, the sensors use some type of communication method (such as wireless radio transmitters, conductors, or cables) to send signals to the control panel to... 

Once a sensor in an alarm system detects an event, it must communicate an alarm signal. The two basic types of alarm communication systems are hardwired and wireless. Hardwired systems rely on wire that is run from the control panel to each of the detection devices and annunciators. Wireless systems transmit signals from a transmitter to a receiver through the air—primarily using radio or other waves. Hardwired... 

Cell signalling and signal transduction are topics of great research interest, partly because defects of these processes are associated with diseases such as type 2 diabetes, cancer and obesity. In recognition of this is the fact that a number of Nobel Prizes for Medicine or Chemistry have been awarded to researchers of cell communication. This chapter describes the nature of the disparate signalling molecules and how they regulate the activity of their targets. 

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