topmain

HOTELS IN CHINA AND ASIA

CLICK HERE FOR ONLINE HOTEL RESERVATION

IT IS INTERESTING!

Secret of love of mosquitoes to human was disclosed - VIDEO PDF Print E-mail
Thursday, 13 November 2014 17:43

Love the smell of man, expressed at the genetic level, helped the ancestors of bloodsucking insects switch to humans and become carriers of the deadly disease - dengue and yellow fever.

Mosquitoes do not always need human blood - their ancestors chose to take nutrients from forest animals. But a few thoUSAnd years ago, some mosquitoes have implemented highly successful in terms of the evolution of a change of diet.

"Our way of life is ideal for mosquitoes. In human dwelling is always water where insects can breed, our body is not covered with hair, and we live in a team "- said one of the authors of articles Fosskholl Leslie (Leslie B. Vosshall). However, the insects had to get used to the neighborhood with the people to live in their homes, to breeding in barrels and jugs with clean water (not in the muddy water that falls in the hollows of trees).

To understand the evolutionary basis of the "novel" mosquito and human Fosskholl and his colleagues turned to genetics. Scientists have long noticed that in a Kenyan village slave at a distance of several hundred meters inhabit two different subspecies of mosquitoes. Black Aedes aEgypti formosus lay eggs in the forest and the animals bite. Brown also Aedes aEgypti aEgypti enjoy a pitcher of water and drink the blood of the people. "This Kenyan village demonstrates to us what happened thoUSAnds of years ago. Participants ancient events and still there "- says Fosskholl.

To identify genes responsible for attachment to a person, the researchers crossed mosquitoes both subspecies, and then analyzed the preferences of hybrid individuals. It turned out that in human blood mustache lovers more highly expressed genes of 14 - and above all Or4, the gene of one of the olfactory receptors.



The researchers guessed that Or4 should react to a certain smell. To accurately determine this matter, they asked for volunteers to wear tights during the day, and then put the clothes in a machine that breaks the smell into individual chemical components. In pantyhose worn by guinea pigs, missing one important element - sulkaton. Scientists have suggested that he makes human odor attractive to mosquitoes. However, when the substance is added to the skin of guinea pigs, these animals did not attract mosquitoes. Now researchers are looking for other components, which should respond insects.


НАЖМИТЕ ЗДЕСЬ ДЛЯ ПРОСМОТРА ВСЕГО СПИСКА НОВОСТЕЙ О НЕОБЫЧНЫХ ЯВЛЕНИЯХ>>>

CLICK HERE TO SEE ALL LIST OF UNUSUAL PHENOMENA NEWS>>>


Related news items:
Newer news items:
Older news items:

 

Add comment


 

SHARE ON: