Les 10 concurrents bioedge.org les plus visités

bioethicsdiscussion.blogspot.com

What have you been reading, hearing or TV viewing that has provoked some feelings of comfort or concern about what is happening in the world of medicine, medical care, treatment or science? Ethics is all about doing the right thing. Are you aware of any issues in medicine or biologic science which are being done right, could be improved or in fact represent totally unethical behavior? Write about them here.. and I will too! ..Maurice (DoktorMo@aol.com)

sciencedaily.com

Parallel evolution is the independent evolution of similar traits, starting from a similar ancestral condition. Frequently this is the situation in more closely related lineages, where several species respond to similar challenges in a similar way. One of the most spectacular examples of parallel evolution is provided by the two main branches of the mammals, the placentals and marsupials, which have followed independent evolutionary pathways following the break-up of land-masses such as Gondwanaland roughly 100 million years ago. In South America, marsupials and placentals shared the ecosystem (prior to the Great American Interchange); in Australia, marsupials prevailed; and in the Old World the placentals won out. However, in all these localities mammals were small and filled only limited places in the ecosystem until the mass extinction of dinosaurs forty million years later. At this time, mammals on all three landmasses began to take on a much wider variety of forms and roles. While some forms were unique to each environment, surprisingly similar animals have often emerged in two or three of the separated continents. Examples of these include the litopterns and horses, whose legs are difficult to distinguish; the European sabre-tooth tiger (Smilodon) and the South American marsupial sabre-tooth (Thylacosmilus); the Tasmanian wolf and the European wolf; likewise marsupial and placental moles, flying squirrels, and (arguably) mice.

mercatornet.com

Departments of Government Efficiency will begin popping up in many more Western democracies over the coming decade, says KURT MAHLBURG

nbcnews.com

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