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To determine the channel capacity, it is necessary to find the capacity-achieving distribution () and evaluate the mutual information (;). Research has mostly focused on studying additive noise channels under certain power constraints and noise distributions, as analytical methods are not feasible in the majority of other scenarios.
The channel capacity can be calculated from the physical properties of a channel; for a band-limited channel with Gaussian noise, using the Shannon–Hartley theorem. Simple schemes such as "send the message 3 times and use a best 2 out of 3 voting scheme if the copies differ" are inefficient error-correction methods, unable to asymptotically ...
Some authors refer to it as a capacity. But such an errorless channel is an idealization, and if M is chosen small enough to make the noisy channel nearly errorless, the result is necessarily less than the Shannon capacity of the noisy channel of bandwidth , which is the Hartley–Shannon result that followed later.
Ion channels are a type of transmembrane channel responsible for the passive transport of positively charged ions (sodium, potassium, calcium, hydrogen and magnesium) and negatively charged ions (chloride) and, can be either gated or ligand-gated channels. One of the best studied ion channels is the potassium ion channel. The potassium ion ...
In contrast, a channel can be open to both environments at the same time, allowing the molecules to diffuse without interruption. Carriers have binding sites, but pores and channels do not. Carriers have binding sites, but pores and channels do not.
BK channel openers can also have a protective effect on the cardiovascular system. [10] At a low concentration of calcium BK channels have a greater impact on vascular tone . [ 10 ] Furthermore, the signaling system of BK channels in the cardiovascular system have an influence on the functioning of coronary blood flow . [ 10 ]
On the other hand, purinergic receptor activation can also lead to the opening of the channel, via a positive feedback loop. [4] In addition, P2Y receptors activate inositol trisphosphate , which leads to a transient increase in intracellular calcium , and opens both connexin and pannexin channels, therefore contributing to the propagation of ...
Download as PDF; Printable version; In other projects Wikidata item; ... Shannon capacity may mean Channel capacity, the capacity of a channel in ...