I neglected to include the latest carnival of Animalcules in my last round up. In my defense, though, I will say that they are very, very tiny and easy to miss.
Palaeos is gone! There is a brief note about being unable to support it any longer, and then poof, it’s offline. Martin Brazeau has a comment on it’s value; you can still see fragments of this great resource in google’s cache, but even that will fade too soon.
This is troubling, and it’s one of the worrisome aspects of using the net—there’s no sense of permanence. It would be good if someone were to step forward and at least archive all of the pages, but the essential feature of the Palaeos site was that it was continually maintained and updated to reflect current information, and that’s not something that can be supported without the dedication of much time and effort by someone knowledgeable in the subject.
Next time you’re cutting up a fresh bird, try looking for the lungs. They’re about where you’d expect them to be, but they’re nestled up dorsally against the ribs and vertebrae, and they’re surprisingly small. If you think about it, the the thorax of a bird is a fairly rigid box, with that large sternal keel up front and short ribs—it’s a wonder that they are able to get enough air from those tiny organs with relatively little capability for expanding and contracting the chest.
How they do it is an amazing story. Birds have a radically effective respiratory system that works rather differently than ours, with multiple adaptations working together to improve their ability to take in oxygen. There is also a growing body of evidence that dinosaurs also shared many of these adaptations, tightening their link to birds and also making them potentially even more fierce—they were big, they were active, and their lungs were turbocharged.
I’ve been a bit sex-obsessed lately. No, no, not that way—it’s all innocent, and the objects of my obsessions are all fish.
A little background explanation: one of my current research projects is on the genetics of behavior. This is a difficult area, because behavior is incredibly complex with multiple levels of causation, and one has to be very careful when trying to tease apart all the tangled factors that contribute to it. It takes numbers and lots of controls to sort out the various contributors to a behavior.
It’s almost official now: Pluto really is a planet. As Phil points out, though, this means there are now 12 planets, with maybe many more to come.
Surely, you haven’t had enough information about pycnogonids yet, have you? Here’s another species, Tanystylum bealensis, collected off the British Columbian coast. That’s a ventral view of the male, and those bunches of grapes everywhere are eggs and babies—males do the childcare in this group. These animals also live in relatively shallow water, in the lower intertidal zone, so it was possible to collect thousands of them and develop a complete staging series. Below the fold I’ve put some illustrations of the larvae, which are even cuter.
That Moonie creationist with a degree in developmental biology, Jonathan Wells, floated an actual hypothesis a while back: he postulated that the centrioles were little turbines that generated a force with their rotation. I never saw it as much of a support for Intelligent Design; it was an idea about how centrioles function that did not rule out that they arose by evolutionary mechanisms. Wells seemed to think it was significant because he was inspired by an analogy with a human artifact, but la de da…I don’t think benzene rings are actually made of snakes, despite Kekule’s inspiration.
Anyway, now Ian Musgrave hammers another stake through that idea’s heart: Wells’ hypothesis is falsified.
Jake Young has a good discussion of gender differences and performance in the sciences. His conclusion is one I agree with: there are real differences between men’s and women’s brains, but they are not of a sort to account for the differences in representation in scientific fields. For that, we have to go to culture, and the imposition of extrinsic limits on what people are allowed to do.
Alex has a quick cheat sheet for the different kinds of RNA…but wait! Where’s mtRNA?
