Found a gene that determines, will become a gamete sperm or egg
Japanese genetics found in the DNA of fish unusual gene that determines it, will the sex cell sperm or egg, and changed his work so that in the ovaries of female fish began to form spermatozoa and in the testes of males of the egg, according to a paper published in the journal Science .
“We knew that gametes can turn into sperm and ovum, but no one has suggested that these cells in the vertebrate animals have a special gene”switch” that determines their fate – to become a sperm or egg. Our results indicate that the cell is able to go all the way. This is a very important and unexpected discovery” – quoted by RIA “Novosti” scientist Minoru Tanaka from the Institute of General biology of Japan in the city of Okazaki.
Tanaka and his colleagues made this unusual discovery, watching the development of germ cells in testes and ovaries rice fish-oriii (Oryzias latipes). During maturation of sperm and egg cells, researchers monitored changes in the level of activity of different genes, trying to find the differences between future male and female reproductive cells.
The attention of scientists was attracted to gene foxl3 – “archival copy” of the gene foxl2, which is responsible for growth of eggs and maintaining Continue reading
After hurricane Katrina await epidemics, invasions of snakes and alligators
Official representatives of the United States Federal government, which hastily sent medical equipment and professionals affected by the hurricane “Katrina” areas on the Atlantic coast of the country, warned that the disaster may entail very adverse consequences for the health of the population over a long period, writes The New York Times.
According to officials, they are particularly concerned about the likelihood of outbreaks due to contamination of drinking water by sewage, and because spoiled food and possible transfer of dangerous diseases of animals, especially insects, and the bites of poisonous snakes.
A lot of people died in the hurricane. Some were drowned. Two people died from carbon monoxide poisoning resulting from the use of gas generators in areas with poor ventilation. Nine persons poisoned with carbon monoxide, ended up in the hospital, said Federal officials at a press conference in Atlanta – the city in which is located the Center of control and prevention of diseases.
Yesterday rescuers have been searching the wounded and needy in the area where the hurricane, Continue reading
Venomous snakes of Africa.
Africa, second largest continent on the planet, with a territory of over 30 million square kilometers with a population of almost one billion people, is a country of diversity, ranging from tropical to subtropical temperatures, to an amazing African Safari. Known about the millions who died from the bites of poisonous snakes of Africa and insects.
Poisonous black Mamba snake.
Africa has many deadly poisonous reptiles — Black Mamba is one of them. Black Mambas are actually brown or olive color, it is the most dangerous poisonous snake of Africa . Without a special serum, which was introduced no later than several minutes after the bite, the person dies.
The black Mamba can strike and bite their prey up to twelve times within a minute, and each shot will produce enough toxic poisons to kill an adult human. Adult Black Mambas can reach speeds of up to 20 kilometers per hour, grows to 2.5 meters in length. She will attack if cornered, scared or if she feels threatened. The black Mamba is deadly, can kill any person who is not ready to meet with her.
The Gabon Viper is a poisonous snake.
This species lives in Central Africa, Eastern and Western States produces the largest amount of venom of any snake in the world, one bite can kill a person within minutes. Reptiles are beautifully colored, with pink, brown, black spots. Continue reading