Chimpanzés : le cerveau fait-il la personne (Agence Science-Presse) Les chimpanzés sont-ils des personnes ? Depuis quelques années, certains tentent de répondre à la question par la voie des tribunaux. Mais si la solution venait plutôt des neurosciences ? Cliquer sur la photo pour agrandir C’est ce dont ont débattu, outre des neurologues, des éthiciens, des philosophes et — inévitablement — des juristes, lors d’une rencontre de deux jours qui s'est tenue en juin à l’Institut de recherches en sciences cognitives de Philadelphie. « Les neurosciences reconstruisent les frontières conventionnelles entre les créatures », explique au New Scientist l’organisatrice de cette rencontre, Martha Farah, de l’Université de Pennsylvanie. Pour l’instant, le débat est purement d’ordre légal : qu’est-ce qui définit une « personne » ? L’objectif de ces groupes : si un chimpanzé obtient le statut de « personne », il sera par définition illégal de le maintenir en cage — et encore moins de lui faire subir des expériences médicales ou psychologiques.
Shaking Things Up: 10 Resources for Exploring Earthquakes | KQED Education | KQED Does the anniversary of the 1906 San Francisco earthquake trigger a landslide of questions from your students about why earthquakes happen, what faults are, or if scientists can predict quakes? Explore the science of earthquakes, from the Bay Area and beyond, with the following resources. Educator Guide: Exploring Earthquakes This robust guide is part of Exploring Earthquakes, a rich collection of resources co-presented by the California Academy of Sciences and KQED. This material is also available as a free iBooks textbook and iTunes U course. Earthquake Explainer This media-rich collection includes videos, animations, infographics, quizzes, interviews and other assets that focus on earthquakes in a concise and easy-to-understand presentation. Earthquake E-book Learn about earthquakes through video, animations, interactive graphics and a quiz. Earthquakes: Breaking New Ground In this video, find diagrams of plate tectonics and look at the SAFOD earthquake study in Parkfield.
The Earth's Layers Lesson #1 | Volcano World | Oregon State University The Four Layers The Earth is composed of four different layers. Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock- basalts and granites) and the core consists of heavy metals (nickel and iron). The crust is the layer that you live on, and it is the most widely studied and understood. The Crust The Earth's Crust is like the skin of an apple. The crust of the Earth is broken into many pieces called plates. Notice how thin the crust of the Earth is in comparison to the other layers. The crust is composed of two basic rock types granite and basalt. Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates. The Mantle The mantle is the layer located directly under the sima. Convection Currents Many geologists believe that the mantle "flows" because of convection currents. Outer Core 1.
svt terminale s lnb programme officiel Épreuves du baccalauréat général BO n°8 du 13 septembre 2011, série TS obligatoire et spécialité p. 98 BO n°7 06 octobre 2011 épreuve de SVT p. 42 programme 2012 de SVT - livre Nathan en obligatoire et spécialité 1er T arrêt des notes 29/11 (conseil 01 au 15/12) 2ème T arrêt des notes 06/03 (conseil 10 au 22/03) 3ème T arrêt des notes 29/05 (conseil 30 au 10/06) arrêt des cours 08/06 Les devoirs auront lieux, en principe, en semaine Les TP en ligne au format pdf sont ouverts avec Acrobat Reader Thème 1 - La Terre dans l’Univers, la vie et l’évolution du vivant (15 semaines) P1A : Génétique et évolution Rappels : TS-tp-p1A-00-notion genetique Problématique l'arbre du vivant chapitre 1 : Le brassage génétique et sa contribution à la diversité génétique illustration P1A chap 1 TS-tp-p1A-10-meiose TS-tp-p1A-11-brassage TS-tp-p1A-12-chromosome Dm TS-tp-p1A-16-brassage anomalies TS-tp-p1A-16-opsine Homme TS-tp-p1A-16-opsine Primate TS-tp-p1A-17-brassage fécondation Méiose Alpes
Virtual Earthquake - An Introduction What's an earthquake? Earthquakes occur because of a sudden release of stored energy. This energy has built up over long periods of time as a result of tectonic forces within the earth. What are earthquake (Seismic) Waves? A seismic wave is simply a means of transferring energy from one spot to another within the earth. The speed of an earthquake wave is not constant but varies with many factors. What's a Seismogram? Note well: This seismogram is a simulation. How is an Earthquake's Epicenter Located? In order to locate the epicenter of an earthquake you will need to examine its seismograms as recorded by three different seismic stations. The actual location of the earthquake's epicenter will be on the perimeter of a circle drawn around the recording station. Copyright © 1996, 1999 Geology Labs On-Line Gary Novak, Department of Geological Sciences California State University, Los Angeles, CA. 90032-8201
IRIS - Incorporated Research Institutions for Seismology How do seismometers measure vertical ground motion? Animation of the principles of a drum-style vertical seismograph station that records up-and-down movement. Seismographs are designed so that slight earth vibrations move the instrument. The suspended mass remains at rest as the spring absorbs some of the motion. Keypoints: Drum-style vertical seismograph station records up-and-down movement.Seismographs are designed so that slight earth vibrations move the instrument.
Vaccin : les trois questions qui fâchent 1. Les industriels du médicament poussent-ils à la consommation ? C’est l’une des accusations les plus répandues : si les pouvoirs publics essaient à toute force de vacciner massivement la population, la faute en revient aux "big pharma", les industriels du médicament. Certes, le marché des vaccins est détenu par peu d’acteurs : moins de dix (Merck, Novartis, Whyeth…) dont deux, GSK et Sanofi Pasteur, en représentent 50 %. Mais ce secteur ne pèse que 2 % du marché des médicaments, une "broutille" pour ces géants. En outre, la conception, fabrication et distribution à l’échelle planétaire des vaccins nécessitent de lourds moyens. 2. Afin de renforcer l’efficacité du vaccin, il est parfois nécessaire d’ajouter une substance appelée "adjuvant", capable d’augmenter la réponse immunitaire vis-à-vis d’un antigène vaccinal. Ces adjuvants sont l’une des principales causes de l’opposition à la vaccination, car jugés dangereux, comme en témoignent des actions en justice. 3. NUMÉRIQUE.
Animations for Earthquake Terms and Concepts AmplificationShaking levels at a site may be increased, or amplified, by focusing of seismic energy caused by the geometry of the sediment velocity structure, such as basin subsurface topography, or by surface topography. AsperityAn asperity is an area on a fault that is stuck. The earthquake rupture usually begins at an asperity. IRIS - Incorporated Research Institutions for Seismology How do S waves give evidence for a liquid outer core? A seismic shadow zone is an area of the Earth's surface where seismographs cannot detect an earthquake after its seismic waves have passed through the Earth. This animation addresses 3 common variations of S-type seismic body waves. All are shear waves that travel in all directions away from the epicenter of an earthquake. There are 3 common variations of S-type seismic body waves. Keypoints: Seismic shadows are a global effect of seismic waves from large earthquakesS waves radiate spherically away from an earthquake in all directionsS waves don’t appear beyond an angular distance of ~103°S waves are stopped by the liquid outer core