Carrier Concept:
The cell exhibits the existence of carriers or transporters that are highly particular for a specific ion. The carrier picks up an ion from exterior medium to form a carrier-ion complex, undergoes rotation at 180o, and moves across the membrane and discharges the ions on the internal side of the membrane and returns to pick up other ion. The carrier might be an enzyme or a protein. Metabolic energy is expended in this procedure. This concept is supported by isotopic exchange employing radioactive isotopes, saturation effect and specificity of carriers. Carrier concept is described by two theories:
(i) Protein-Lecithin as carrier
(ii) Goldacre's theory
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TRF radio receiver is a straight radio receiver. It is termed as tuned radio frequency receiver.
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