ELECTRONIC MODEL Circadian Rhythm.
Modeling can be performed either constructing physical models or mathematical description of the process. Consider one of the physical models of biological rhythms.
Many have probably seen how light is cold, flickering lights of the night sea, but it did not know that this glow is caused by unicellular alga Gonyaulax luminescence. This small weed has long interested researchers because it has a clear circadian rhythm of metabolic changes in brightness and luminescence. Scientists have discovered (by the way, not without the aid of electronics), which is 24 hours 45 min chemical composition, phase and dividing the value of the brightness of luminescence repeated m. is the period of the circadian rhythm of the algae is 24 hours and 45 minutes. This period is constant and does not change with external influences, but light. Flashes of light led to a shift of the period and change its frequency. How should look like system that has these properties?
In a complex organism, such as mammals, there is a whole system of rhythms, the phases of which differ from each other. Central nervous system (brain) controls the frequency of the so-called endocrine system. The structure consists of her thyroid gland, the hypothalamus and other glands that produce vital hormones. The brain and the endocrine system, in turn, affects the biological clock of the individual cells, such as liver cells, and each of these 'systems are not only influenced by other systems, but she has the reverse effect, so the arrows in the diagram go in both directions. The sensory organs receive information from the external environment and transmit it to the central nervous system, matching each stroke of the movement with each other and with external periodic processes.
The basis of circadian rhythms is not physical, and biochemical processes, but the electronic simulation simplifies the mathematical description of circadian rhythms, making it more obvious what is and is the undoubted benefits of physical models.