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edyong | September 18, 2009The two-toed sloth is a walking hotel. The animal is so inactive that its fur acts as an ecosystem in its own right, hosting a wide variety of algae and insects. But the sloth has another surprise passenger hitching a ride inside its body, one that has stayed with it for up to 55 million years - a virus.
In the Cretaceous period, the genes of the sloth's ancestor were infiltrated by a "foamy virus", one of a family that still infects humans, chimps and other mammals today. They are examples of retroviruses, which reproduce by converting an RNA genome into a DNA version and inserting that…
amillikan | March 10, 2009Among the non-coding DNA that composes a large percentage of the genomes of humans and other eukaryotic organisms, pseudogenes are genes that were once active but were rendered defunct by mutations at some point in evolutionary history. But some pseudogenes may regain their functionality. A study published in PLoS Genetics last week revealed that a gene that codes for a member of the immunity-related GTPase protein family, IRGM, was subject to a frameshift mutation in an ancestor of primates 40 million years ago, due to insertion of a small fragment of DNA. The non-functional pseudogene…
amillikan | January 3, 2009In this week's featured episode of Science Saturday from Bloggingheads, George Johnson and John Horgan returned with new insight on the controversy provoked by their last appearance, including some negative comments directed toward ScienceBlogger Abbie from ERV.
Johnson admitted that he may have been reacting to his cumulative perception of lower-end blogging, the existence of which Horgan explained by 'The law of the conservation of bullshit'—no matter how much the information sphere expands, there's still going to be the same proportion of bullshit circulating throughout it.
But…
amillikan | December 20, 2008Today on ScienceBlogs.com, you will notice a new feature on the site. Instead of The Buzz, we have an embedded video from Bloggingheads.tv. This feature will appear every Saturday and can be viewed subsequently here on Page 3.14, the editorial blog of ScienceBlogs.com. This week, John Horgan from the Stevens Center for Science Writings and George Johnson, author of Fire in the Mind and The Ten Most Beautiful Experiments discuss recent attempts of scientists to use functional Magnetic Resonance Imaging technology to display graphic images on a computer screen directly from the visual cortex…