A group of British researchers try to put order to issue a year that for centuries has kept scientists and philosophers: Which came first the chicken or the egg? The answer is a protein responsible for the formation of the eggs ....
*************************
The age-old question of who came first between the chicken and the egg has finally an answer: he found a group of British scientists at a research on the processes that lead to the crystallization of calcium carbonate and the formation of the rigid part of the eggs. Colin Freeman and his colleagues Univesità of Warwick and Sheffield have discovered that the protein ovocledidina17 (OC-17) this in the ovaries of hens is responsible for the processing of calcium carbonate in calcite crystals, the substance that makes up the hardest part of the shell. Not only that, they also found that in the absence of this protein shell of the eggs do not harden and therefore can not accommodate the pulcino.Secondo scientists of His Majesty, the hen, or at least that its protein, therefore the egg came first . "It's not what we wanted to prove with this research, but it is certainly interesting consideration," said Professor Freeman enjoyed the media. "In reality the issue is much more complex and goes back to times when the ancestors of dinosaurs, birds have learned to do with the hard-shelled eggs." As the original research of Freeman and colleagues is very serious and could lead to interesting practical developments in the field of artificial bone synthesis and storage of CO2 in the form of limestone. ************************* *********************** **
It took centuries of study and all the power of a modern supercomputer, but finally one of the oldest questions in history - came first the chicken or the egg? - Has an answer. Colin Freeman and his colleagues from the universities of Warwick and Sheffield (UK) have no doubt that the chicken came first, or at least its a protein that plays a role key in the formation of the eggs.
Scientists have long known that the protein ovocledidina17 (OC-17), present only in the hardest part of the shell and in the ovaries of chickens, influences the processing of calcium carbonate into calcite crystals (the substance that makes it hard to shell itself), but have never been able to clarify the mechanism of this transformation. To solve the mystery have asked for help from Hector (High End Computing Terascale Resource), a supercomputer installed in Edinburgh and an expert on the dynamics of cellular evolution. Thanks to this machine have developed a simulation that shows how the protein binds to calcium carbonate through the special "chemical clamps. A Having established the link to the OC-17 works as a catalyst that helps the calcium to become partcelle calcite crystals and to accumulate on top of one another. When the core of the crystal is large enough to be able to continue its growth by itself, it loses the link with the protein, which is recycled by binding to other crystals and thereby speeding up the hardening of the shell that is usually within a night.
The researchers also found that in the absence of OC-17 crystallization of the shell can not happen. It suffciente to say that the chicken egg came first? " not what we wanted to demonstrate by our study, but it is certainly an interesting point, "said Freeman enjoyed the media," In reality the issue is much older and dates back to when dinosaurs, the ancestors of birds have learned to do with the hard-shelled eggs.
study British scientists is actually very serious and very real practical implications: it will help researchers to develop new systems to synthesize artificial bones and store the CO2 in the form of limestone.
********** ************************* ***************
Yet a few years ago Another distinguished English professor had come to conclusions very different ... Here's what was said:
You came first, the hen's egg? The age-old question has an answer and it comes from John Brookfield of the University of Nottingham (England): The egg comes before the chicken. Why? "The gene pool does not change during the life of an organism," says the scientist. "The bird in the course of evolution has transformed into the chicken in prehistoric times, therefore, must have been an egg." The research, halfway between science and wisdom, has called into question geneticists and biologists, but also philosophers and ... egg producers.
0 comments:
Post a Comment