Group items tagged

Researchers produce first complete computer model of an organism July 20, 2012 By Max McClure

(Phys.org) -- In a breakthrough effort for computational biology, the world's first complete computer model of an organism has been completed, Stanford researchers reported in the journal Cell.

team led by Stanford bioengineering Professor Markus Covert used data from more than 900 scientific papers to account for every molecular interaction that takes place in the life cycle of Mycoplasma genitalium – the world's smallest free-living bacterium.

Throughout the universe more than 99 percent of matter looks nothing like what's on Earth.

This material that pervades the universe, making up the stars and our sun, and also – far less densely, of course – the vast interstellar spaces in between, is called plasma. Plasmas are similar to gases, and indeed are made of familiar stuff such as hydrogen, helium, and even heavier elements like iron, but each particle carries electrical charge and the particles tend to move together as they do in a fluid.

"Which particles are moving, what is the source of energy for the motion, how does a moving wave interact with the particles themselves, do the wave fields rotate to the right or to the left – all of these get classified," says Lynn Wilson who is a space plasma physicist at NASA's Goddard Space Flight Center in Greenbelt, Md.

In everyday life and in classical physics, events are ordered in time: a cause can only influence an effect in its future not in its past. As a simple example, imagine a person, Alice, walking into a room and finding there a piece of paper. After reading what is written on the paper Alice erases the message and leaves her own message on the piece of paper. Another person, Bob, walks into the same room at some other time and does the same: he reads, erases and re-writes some message on the paper. If Bob enters the room after Alice, he will be able to read what she wrote; however Alice will not have a chance to know Bob's message. In this case, Alice's writing is the "cause" and what Bob reads the "effect". Each time the two repeat the procedure, only one will be able to read what the other wrote. Even if they don't have watches and don't know who enters the room first, they can deduce it by what they write and read on the paper. For example, Alice might write "Alice was here today", such that if Bob reads the message, he will know that he came to the room after her.

"On observe de plus en plus de signaux annonçant une récession mondiale", commente James Dailey de TEAM Financial Managers. "Ce n'était pas quelque chose de prévu par les marchés il y a encore environ une semaine."

le", commente James Dailey de TEAM Financial Managers. "Ce n'était pas quelque chose de prévu par les marchés il y a encore environ une semaine." Aux valeurs, Pharmasset a bondi de plus de 84,5% après l'annonce de son rachat par Gilead pour quelque 11 milliards de dollars (8,2 milliards d'euros). Ce dernier, qui cherche ainsi à se renforcer dans les traitements de l'hépatite C, a chuté de 9%.   Suite... Voir l’article sur la page simple Page précédente 1 | 2 Page suivante     Article suivant : Paris et les Bourses européennes chutent lourdement en clôture     D'autres nouvelles Echec annoncé de la mission sur les déficits américains Paris et les Bourses européennes chutent lourdement en clôture Les valeurs suivies à la clôture de la Bourse de Paris Mise en garde de Moody's sur le Aaa français Plus... fr.reuters.com:  Aide et Informat

Dung beetles just climbed another ladder on the animal coolness scale – they are the only known species to navigate via the Milky Way. The tiny insects can orient themselves to the bright stripe of light generated by our galaxy, and move in a line relative to it, according to experiments conducted in South Africa.