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Dinosaur Confusion

Discussion of everything related to the Theory of Evolution.

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Postby flint » Wed Mar 15, 2006 10:41 pm

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Postby David George » Wed Apr 05, 2006 10:07 am

There is a problem about the evolution of birds.Some say that they evolved in the Triassic period from the reptile Protoavis.Some say from archaeopteryx.Some say in the cretaceous period and still others say from reptiles and not dinosaurs.Tell which one you support and also the reasons.
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Postby David George » Sun Apr 09, 2006 4:26 am

Having lived some 75 million years ago, the two-legged dinosaur was twice the size of related species found in Canada and the northern United States, say fossil experts at the University of Utah in Salt Lake City.

The find shows that a group of dinosaurs called oviraptors roamed much farther south than previously thought, they add.

Oviraptors had simple feathers, winglike arms, powerful legs, long claws, and powerful, toothless beaks for shearing through food.

Researchers made the find in a remote, mountainous region in the southwestern U.S. that's fast gaining a reputation as an untapped "dinosaur graveyard" full of unusual species.

Only fragments of the animal were discovered—a fearsomely clawed hand and foot. But the dinosaur probably stood seven feet (two meters) tall and ran as fast as an ostrich, according to paleontologists Lindsay Zanno and Scott Sampson.

Named Hagryphus giganteus ("giant four-footed, birdlike god of the western desert"), the new species is described in the current issue of the Journal of Vertebrate Paleontology.

here is a link for further information
http://news.nationalgeographic.com/news ... osaur.html
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Postby AstusAleator » Thu Jun 05, 2008 4:09 am

Try eating that for Thanksgiving...
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"
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Postby AstusAleator » Thu Jun 05, 2008 4:12 am

http://www.npr.org/templates/story/stor ... d=89942780

So here's a question to our micro-bio folks. Do collagen-protein sequences actually tell us much as far as genetic heritage?
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"
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Postby MrMistery » Thu Jun 05, 2008 3:59 pm

Sure they do Astus. That is molecular systematics. Generally we use molecular systematics by analyzing how rRNA or chaperone sequences diverged. However, in this case that was not possible, so the scientists used the protein at hand - collagen - to analyze changes between various taxonomic groups. This kind of taxonomic method works like this: you analyze six organisms, and at a certain position one has a cysteine residue, while the other five have a lysine residue, for example. It's safe to say that the one with the cysteine diverged from the others very early. In theory it can be used for almost any protein.
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Postby AstusAleator » Fri Jun 06, 2008 12:31 am

Thanks! :D
Since I'm more of a field-systematics biologist, it's nice to know I have micro-bio buddies that can help me out in my time of need.
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Postby MrMistery » Mon Jun 09, 2008 9:14 am

this is more molecular biology. Microbiology deals with microorganisms
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Re:

Postby MichaelXY » Mon Jun 09, 2008 11:54 pm

MrMistery wrote:this is more molecular biology. Microbiology deals with microorganisms


Ah heck, micro, molecular, they are both just damn small to us macro candela receptors :wink:
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