Tag: science
Shape-Shifting Protein in Bacterial Flagellum Controls Spin Direction
It’s been long known that the bacterial flagellum can spin in one direction and then quickly reverse directions and spin in the other. A recent issue of Nature has an article titled, “Structure of the torque ring of the flagellar motor and the molecular basis for rotational switching” which elucidates some of the biomechanical properties of the FliG motor protein that allows this rotation switch to occur: The flagellar motor drives the rotation of flagellar filaments at hundreds of revolutions per second, efficiently propelling bacteria through viscous media. The motor uses the potential energy from an electrochemical gradient of cations across the cytoplasmic membrane to generate torque. A rapid switch from anticlockwise to clockwise rotation determines whether a bacterium runs Read More ›
Evolutionary Biologists Are Unaware of Their Own Arguments: Reappraising Nature‘s Prized “Gem,” Tiktaalik (Updated)
Links to our 9-Part Series Responding to Nature‘s Evolution Evangelism Packet: • Part 1: Evaluating Nature’s 2009 “15 Evolutionary Gems” Darwin-Evangelism Kit • Part 2: Microevolutionary Gems: Lizards, Fish, Snakes, and Clams • Part 3: Microevolutionary Gems: Bird-Sized Evolutionary Change • Part 4: Microevolutionary Gems: Flea and Guppy-Sized Evolutionary Change • Part 5: Microevolution Meets Microevolution • Part 6: Evolutionary “Gems” or “Narrative Gloss”? • Part 7: Muscling Past Homology Problems in Nature’s Vertebrate Skeleton “Evolutionary Gem” • Part 8: Of Whale and Feather Evolution: Two Macroevolutionary Lumps of Coal • Part 9 (This Article): Evolutionary Biologists Are Unaware of Their Own Arguments: Reappraising Nature‘s Prized “Gem,” Tiktaalik Download Our Full Response to the Packet as a PDF. The final Read More ›
Inconsistent Reasoning Governs Evolutionary Interpretations of Feathered Dinosaurs
Nature news is reporting another feathered dinosaur. The title of the Nature news article says, “Crested dinosaur pushes back dawn of feather.” This dinosaur is from around 130 mya, but feathers are already known from the bird Archaeopteryx around 150 mya. So how does it push back the origin of feathers? Their reasoning is that the feathers on this new species, dubbed Concavenator corcovatus, appear in a different lineage than the one that supposedly led to birds. Since “such structures [feathers] are unlikely to have evolved separately in both groups” they use evolutionary reasoning to infer that “the common ancestor of the two predatory dinosaur branches, ‘could have been feathered’.” This pushes the origin of feathers back to “Middle Jurassic Read More ›
Academic Elites Don’t Appreciate Uppity Scientists Who Buck the Consensus
Here come more threats to academic freedom, not unlike those seen by intelligent design proponents and Darwin skeptics. Over the years we’ve covered many, many cases like this where someone who expresses doubt about Darwinian evolution is harassed, fired, denied tenure, and so on. “The significance of this is a threat to academic freedom and it’s also a threat to academic science,” Siegel said. “If scientists have to produce work that meets a certain view to keep their jobs, researchers are going to stop publishing negative findings for fear of being fired.” No, they will simply stop researching period in the subject areas that get them in trouble. The average scientist can find lots of fruitful areas of research that Read More ›
Hawking Not Needed to Explain His New Book, Says Universe
Reached today for comment about Stephen Hawking’s new book, the Universe said that Professor Hawking should receive no credit for the ideas. “You humans naively assume that ‘physicists’ exist, who discover theories,” said the Universe. “But I did it all. Me. The transitory entity known to you as ‘Stephen Hawking’ is merely an epiphenomenon of the laws of nature, otherwise known as Me, the Universe itself. Mindless physical stuff, the only thing that ever really existed, or ever will exist.” “Hawking, and that other guy — what’s his face, Dawkins — have been stealing my royalties for years. I’ve got some lawyers working on that.” “Anyway, I don’t know why Hawking and Dawkins, or Harris and Dennett and the rest Read More ›