DNA From The Beginning Neuroscience Online: An Electronic Textbook for the Neurosciences | Department of Neurobiology and Anatomy - The University of Texas Medical School at Houston How Cells Work | HowStuffWorks At a microscopic level, we are all composed of cells. Look at yourself in a mirror -- what you see is about 10 trillion cells divided into about 200 different types. Our muscles are made of muscle cells, our livers of liver cells, and there are even very specialized types of cells that make the enamel for our teeth or the clear lenses in our eyes! If you want to understand how your body works, you need to understand cells. Anyone who reads the paper or any of the scientific magazines (Scientific American, Discover, Popular Science) is aware that genes are BIG news these days. BiotechnologyGene splicingHuman genomeGenetic engineeringRecombinant DNAGenetic diseasesGene therapyDNA mutationsDNA fingerprinting or DNA profiling Gene science and genetics are rapidly changing the face of medicine, agriculture and even the legal system! In this article, we'll delve down to the molecular level to completely understand how cells work. What is a virus and how does it work at the molecular level?
A l'adolescence, le cerveau créerait de nouvelles cellules pour mieux communiquer Selon une récente étude, le cerveau développerait à l'adolescence de nouvelles cellules qui aideraient à interpréter les expressions faciales et le langage du corps. Autant de capacités nécessaires pour communiquer avec les autres. L'adolescence est une période charnière durant laquelle l'organisme se prépare à entrer dans la vie adulte. Avez-vous déjà partagé cet article? Partager sur Facebook Partager sur Twitter Des cellules qui facilitent les interactions Des chercheurs de l'Université d'Etat du Michigan (MST) ont en effet découvert un lien entre la puberté et notre capacité à communiquer. Ceci leur a permis de mettre en évidence des cellules cérébrales qui n'étaient pas là avant la puberté. "L'amygdale joue un rôle important en aidant le cerveau à interpréter les signaux sociaux. Un mécanisme similaire chez l'humain ? "Nous ne savons pas si des cellules apparaissent dans l'amygdale humaine durant la puberté. Un cerveau beaucoup moins figé qu'on ne pensait
Image Archive on the American Eugenics Movement Cold Spring Harbor Laboratory's The Eugenics Archive utilizes Flash for enhanced search features, cross referencing, and interactive images created with Zoomifyer. Get the Flash plugin at Adobe.com. The Eugenics Archive will open in a new window. I prefer the original, HTML-only Eugenics Archive site, take me there. Eugenics Archive Blog Sterilization Laws Based on a task force recommendation, the North Carolina legislature is considering paying $50,000 to living individuals sterilized by the state against their will or without their knowledge. Examine the Chronicle of how society dealt with mental illness and other "dysgenic" traits in the final section of our website DNA Interactive.
Feeling Our Emotions FOR CENTURIES, the fleeting and highly subjective world of feelings was the purview of philosophers. But during the past 30 years, Antonio R. Damasio has strived to show that feelings are what arise as the brain interprets emotions, which are themselves purely physical signals of the body reacting to external stimuli. Born in 1944 in Lisbon, Portugal, Damasio has been chair of the University of Iowa's neurology department since 1986. In recent years, Damasio has become increasingly interested in the role emotions play in our decision-making processes and in our self-image. —Interview by Manuela Lenzen MIND: Professor Damasio, why are you so fascinated by the nature of human emotion? Antonio R. MIND: You differentiate between feelings and emotions. Damasio: In everyday language we often use the terms interchangeably. MIND: So, then, feelings are formed by emotions? Damasio: Yes. MIND: According to your definition, all feelings have their origin in the physical.
Blood Groups, Blood Typing and Blood Transfusions The discovery of blood groups Experiments with blood transfusions, the transfer of blood or blood components into a person's blood stream, have been carried out for hundreds of years. Many patients have died and it was not until 1901, when the Austrian Karl Landsteiner discovered human blood groups, that blood transfusions became safer. Mixing blood from two individuals can lead to blood clumping or agglutination. The clumped red cells can crack and cause toxic reactions. Karl Landsteiner's work made it possible to determine blood groups and thus paved the way for blood transfusions to be carried out safely. What is blood made up of? An adult human has about 4–6 liters of blood circulating in the body. Blood consists of several types of cells floating around in a fluid called plasma. The red blood cells contain hemoglobin, a protein that binds oxygen. The white blood cells fight infection. The platelets help the blood to clot, if you get a wound for example. AB0 blood grouping system 1. 2.
Prise de décision et émotions : l'erreur de Descartes Comment prenez-vous vos décisions ? Le savez-vous vraiment ? Sous la face visible de cet acte, qui fait miroiter une raison toute-puissante, se cache un entrelacs de facteurs au premier rang desquels les émotions. Oui, celles-là même qui suscitent méfiance et déni en entreprise… se retrouvent à leur tête, dans les choix des managers et dirigeants ! Ironie du sort, elles peuvent même y exceller. Rappelez-vous vos 3 dernières décisions. Etymologiquement, décider c’est trancher sur une question (de + caedere, en latin « trancher, couper »). E-motion, du mouvement Vous l’avez sans doute noté, trancher est plus facile quand nous sommes mus par une émotion simple et forte. Parfois cette impulsion nous joue des tours : mauvaises décisions prises sous le coup de la colère, décisions incohérentes à la suite d’émotions en montagnes russes, etc. Les émotions sont un mouvement (e movere, en latin) qui aide le passage à l’acte. Mais elles sont encore plus profondément associées à nos décisions. .