background preloader

Biologie

Facebook Twitter

Une découverte sans précédent : les plantes savent quand elle sont en train d’être mangées. 52 foods that boost penis health, supercharge libido, and increase pleasure. To boost the health of one of your favorite body parts and ensure it stays at its prime, you must first consider what’s hurting your penis.

52 foods that boost penis health, supercharge libido, and increase pleasure

From stress to sleep deprivation to alcohol consumption, and even a bad attitude, there are a number of things that harm your sperm, testosterone production, and crush your desire to get busy. However, upping your intake of specific foods can actually have the opposite effect. Morning glory seeds are tough enough for an interplanetary trip. Natural sunscreens help morning glory seeds survive doses of ultraviolet (UV) radiation that would burn most humans to a crisp, according to a new study.

Morning glory seeds are tough enough for an interplanetary trip

The hardy seeds of the common flowering plant would probably even survive a voyage between planets, say the researchers. This might help researchers decide which species to send on future missions to Mars, a place that is bombarded with UV light because of its thin atmosphere. It also validates the concept of panspermia, the idea that life might have hopscotched through our solar system—or others—by hitching a ride on asteroids or comets. “These results add to the fast-growing body of evidence showing that panspermia is not only possible, but absolutely inevitable,” says Chandra Wickramasinghe, director of the Buckingham Centre for Astrobiology at the University of Buckingham in the United Kingdom, who was not involved in the study.

La fellation c’est pas simplement fun, c’est aussi très sain! Voici la preuve! Fellation rime avec santé de plomb ?

La fellation c’est pas simplement fun, c’est aussi très sain! Voici la preuve!

Paleontologists identify new 507-million-year-old sea creature with can opener-like pincers. The Possibility of Silicon-Based Life Grows. Science fiction has long imagined alien worlds inhabited by silicon-based life, such as the rock-eating Horta from the original Star Trek series.

The Possibility of Silicon-Based Life Grows

Now, scientists have for the first time shown that nature can evolve to incorporate silicon into carbon-based molecules, the building blocks of life on Earth. Artist rendering of organosilicon-based life. Organosilicon compounds contain carbon-silicon bonds. Recent research from the laboratory of Frances Arnold shows, for the first time, that bacteria can create organosilicon compounds. Research unlocks molecular key to animal evolution and disease.

The dawn of the Animal Kingdom began with a collagen scaffold that enabled the organization of cells into tissues.

Research unlocks molecular key to animal evolution and disease

This key innovation, which made possible the rich diversity of life on earth, is found in the most ancient of currently living animals - the ctenophore, Vanderbilt University Medical Center scientists report today in the online journal eLife. Ctenophores, commonly called comb jellies, are marine invertebrates known for their translucent, globe-like bodies that refract light into dazzling rainbow-like colors. They have one thing in common with all animals - rope-like collagen IV molecules that assemble into scaffolds outside of the cell. These "smart" scaffolds are the fundamental architectural unit of the basement membrane, which, in turn, connects cells, provides strength to tissues and transmits information that influences how cells behave "The fundamental principles of tissue development are present in ancient animals," Hudson said.

La découverte du plus vieux fossile humain redessine l’arbre généalogique de l’Homme. Ledi-Geraru, le site sur lequel la mâchoire a été découverte, était une région de prairies et d’arbustes il y a 2,8 millions d’années, autrement dit très similaire au Serengeti d'aujourd’hui d’après un papier rédigé en parallèle par Erin DiMaggio et ses collègues de l’Université d’Etat de Pennsylvanie.

La découverte du plus vieux fossile humain redessine l’arbre généalogique de l’Homme

Les espèces animales présentes à cette même époque indiquent que l’habitat naturel est devenu plus ouvert et aride, ce qui corrobore la thèse d’un changement climatique qui aurait déclenché certaines évolutions au sein de nombreuses lignées animales du moment. This Abandoned Hornet's Nest Is Creepy As Hell. Has science found the fossilized remains of an Ent from Middle-Earth or the spirit of nature incarnate?

This Abandoned Hornet's Nest Is Creepy As Hell

Naked female scientist tries to tame beluga whales in the arctic. By Daily Mail Reporter Created: 23:47 BST, 15 June 2011 Braving sub-zero temperatures, she has thrown caution — and her clothes — to the wind to tame two beluga whales in a unique and controversial experiment.

Naked female scientist tries to tame beluga whales in the arctic

Natalia Avseenko, 36, was persuaded to strip naked as marine experts believe belugas do not like to be touched by artificial materials such as diving suits. The skilled Russian diver took the plunge as the water temperature hit minus 1.5 degrees Centigrade. Discovery Of Early Dinosaur “Cousin” Does Not Look Like Scientists Thought. Paleontologists have got some things not quite right about dinosaurs throughout the years and understandably so – they’re working with dust, sap, and bones from millions of years ago.

Discovery Of Early Dinosaur “Cousin” Does Not Look Like Scientists Thought

But now, a once-in-a-lifetime discovery changes the very look and history of early dinosaur relatives. "Surprisingly, early dinosaur relatives were pretty profoundly not dinosaur-like," said co-author Ken Angielczyk, The Field Museum’s associate curator of fossil mammals, in a statement. In a study published in Nature, the team introduces to the world to Teleocrater rhadinus. The 6-foot (1.8-meter) carnivore had a long neck and an even longer tail, with a weight that clocked in at 20-65 pounds (9-30 kilograms).

It stood 2 feet (0.6 meters) at the hip and had quite the swagger – its ankle joints could rotate from side to side as well as flex up and down. La liste alphabétique des chants d'oiseaux. Tech Xplore - Hands-on model helps students understand genetic engineering. A team of faculty and undergraduate researchers have created a physical, interactive model to teach students about genetics and biological processes at the cellular level.

Tech Xplore - Hands-on model helps students understand genetic engineering

"By creating an analogue between a biological system and a physically engineered system, we think we can help students grasp the concepts behind genetics, cellular metabolism and genetic engineering," says Cranos Williams, an expert on biological systems modeling and associate professor of electrical and computer engineering (ECE) at NC State. The researchers are seeking partners in nonprofit or private sectors to make the tool more widely available for use in K-12 and undergraduate classrooms.

The Big Idea "We recognized that it is difficult for people to understand what's happening in a mathematical model, so we wanted to see if it would be possible to create a physical model in which electronic circuits mimic what's happening in cellular metabolism. That was the genesis of the project. " How It Works. Cancer cells cast a sweet spell on the immune system. Shrink yourself small enough to swoop over the surface of a human cell, and you might be reminded of Earth’s terrain. Fats, or lipids, stay close to the surface, like grasses and shrubs.

Proteins stand above the shrubs, as mighty oaks or palm trees. But before you could distinguish the low-lying lipids from the towering proteins, you’d see something else adorning these molecules — sugars. If proteins are the trees, sugars are the mosses that dangle from the branches or, perhaps, the large fronds of the palm. Accueil. Silex de singe ? La plus vieille eau du monde contiendrait une forme de vie quasi extraterrestre.

Why Humpback Whales Protect Other Animals From Killer Whales. In May 2012, researchers observed a pod of killer whales attacking a gray whale and its calf in Monterey Bay, California. After a struggle, the calf was killed. What happened next defies easy explanation. Two humpback whales were already on the scene as the killer whales, or orcas, attacked the grays. But after the calf had been killed, around 14 more humpbacks arrived—seemingly to prevent the orcas from eating the calf. This strange mineral grows on dead bodies and turns them blue. If you were to get up close and personal with Ötzi the Iceman – the 5,000-year-old mummy of a tattooed, deep-voiced man who died and was frozen in the Alps – you’d notice that his skin is flecked with tiny bits of blue.

At first, it would appear that these oddly bluish crystal formations embedded in his skin are from freezing to death or some other sort of trauma, but it’s actually a mineral called vivianite (or blue ironstone) and it happens to form quite often on corpses left in iron-rich environments. For Ötzi, the patches of vivianite are from him resting near rocks with flecks of iron in them, but other cases are way more severe. According to Chris Drudge at Atlas Obscura, a man named John White was buried in a cast iron coffin back in 1861. During those days, coffins often had a window for grieving family members to peer inside even if the lid was closed during the funeral.

Over a century later, White was exhumed because of land developments in the area. La matière noire du vivant. Aujourd'hui, l'approche métagénomique permet de prendre en compte, dans la classification du vivant, des organismes que l'on ne connaissait pas parce qu'on ne savait pas les cultiver en laboratoire. En mai 2016, une équipe internationale sous la direction de Jillian Banfield, de l'université de Californie, à Berkeley, a construit un nouvel arbre (ci-dessus) à partir non seulement de 30 437 génomes publiés de microorganismes issus des trois domaines du vivant – bactéries, archées, eucaryotes –, mais aussi de données génomiques sur plus de 1 000 autres jamais cultivés, obtenus à partir d'environnements variés : une croûte de sel du désert d'Atacama, le rostre de deux dauphins, le sol d'une prairie californienne, des eaux profondes japonaises...

De même, il est impossible d'ajouter une racine à cet arbre. Voir l'infographie en grand format. Could an astronaut’s corpse bring new life to another world? One day, it's bound to happen. An astronaut dies in space. Maybe the death occurred en route to Mars. This strange mineral grows on dead bodies and turns them blue. Bigger is better when it comes to the G spot. Bigger is better when it comes to the G spot. Une bactérie vit dans un lieu inhabitable...

Desulforudis audaxviator audaxviator a été découvert dans une mine d'or à une profondeur que l'on pensait inhabitable pour une espèce vivante... Le nom "audaxviator" a été inspiré par une citation du livre Voyage au centre de la Terre, de Jules Verne. L'expression latine «viator audax» se traduit par «voyageur audacieux», une référence à l' habitat souterrain de la bactérie.