Monday, September 15, 2008

Bilogical watch?

According to this theory, each kind of live organisms has certain life expectancy. A certain inner clock counts time and starts the destroying mechanism causing ageing and as a result leading death.

It is known that each kind has also certain maximum life expectancy. For a turtle is on the average 130 years (can be and more), for the person–120 years, for a cat – 20 years, and for a shrew – only 2 years. It suggests that life expectancy of a kind is genetically programmed.

The assumption will be co-ordinated by that various cages of which fabrics of a human body consist, reproduce themselves division only the limited number of times. Here pertinent there is a mention so-called «a limit of Hajflika».

The experiences spent over cellular cultures of various kinds of animals, have shown that there is a maximum number of the divisions made by a cage. It depends on a kind to which the animal belongs, type of a cage and age of the donor at which was the cage is taken. It also is the limit of Hajflika named in honour of the scientist, for the first time found out this phenomenon.

The cage of a skin of a hand, taken from the newborn, shares about 50 times, at the 40-year-old person – 40 times, at 90-year-old – 30 times. On the other hand, there is a communication between average life expectancy of a kind and a corresponding limit of Hajflika. For example, the turtle living about 175 years, has the limit of Hajflika equal 130. So, cell fission process in a statement of scientists (in it, the truth, very many scientific terms, but without them to explain this process very difficult) here is how looks. During cellular reproduction telomers (the structures providing stability of chromosomes) lose a small part of the length. After some number of divisions теломеры become very short, and the cage loses ability to the further division.

It, possibly, also existence of a certain limit of divisions speaks. Germinal cages which are responsible for transfer of a life from generation to generation, contain enzyme - теломеразу. This enzyme regulates length теломера and, thereby, causes existence of a limit of Hajflika. Opening telomers suggested that the key to immortality with which help it will be possible to block internal clocks is found.

However it is necessary to remember that it only a hypothesis demanding careful research. Existence of a limit of Hajflika shows that the theory of internal clocks basically is true. But the age at which there comes genetically programmed death connected with a sharp stop of the basic mechanism of the biological car, strongly differs from the maximum life expectancy established for the given kind. Under this theory at the person the last, 50, division should occur in 250-300 years. To this age, however, nobody lives because of loss by cages of the functions as a result of accident of errors.

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