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1. Re: Re: 3 1/2 vs. 4 chambered hearts
- dml.cmnh.org
- 4 chambered hearts .
- 4 chambered hearts .
- Judging from all the derivations required to achieve a 3 chambered mode while underwater, I'd say the evidence seems to clearly point to a primitive crocodilian condition of 4 chambers. ... Is it not possible that ALL reptiles except Ornithodira had > >3 > >1/2 chambered hearts (including crocodyliforms) and that true > >four-chambered > >hearts (other than the separate evolution in the mammalian lineage) only > >evolved in Ornithodirans----perhaps all ornithodirans (including > >pterodactyls?), or just the dinosaur-bird clade, or possibly even just > >certain branches of dinosaurs (including those that gave rise to birds). > > Is there any reason at all to assume that all archosauromorphs had > >four-chambered hearts, and crocodyliformes reverted back to a 3 1/2 > >chambered heart? This doesn't seem very parisimonious to me, unless I am > >unaware of evidence that would make it more parsimonious. A four-chambered > >heart in birds, plus all (or some) dinosaurs makes more sense, and all > >other > >archosauromorphs with some version of 3 1/2 hearts. > > Well, crocodiles do have a four-chambered heart. ... Therefore, we have a potential model system in the > croc of an ancestral four-chambered heart with two aortae that may have > given rise to a bird-style heart in ornithodirans in which the right aorta > became dominant. ... > > So, crocs are probably not reverting to a 3 chambered heart (technically, > most "reptiles" have five chambers -- something for another post!) but > rather retaining a potentially primitive archosaurian character: a definite > four-chambered heart. ... > > So, there is a functional reason to suggest that the ancestor of both birds > and crocs (or ornithodirans and crurotarsi) had four-chambered hearts. ...
2. John Templeton Foundation :: About the Foundation :: The Chambered Nautilus
- www.templeton.org
- Mission Officers Board of Trustees Anne Templeton Zimmerman Board of Advisors Senior Staff 2004 Capabilities Foundation FAQ Conferences & Meetings JTF in the Media Publications Resources The Chambered Nautilus .
- JTF Home > About The Foundation : The Chambered Nautilus The Chambered Nautilus.
- The rare and remarkable chambered nautilus has long captivated scientists, mathematicians, poets, and sailors. ... Its mathematically perfect proportion reminds us that growth is part of nature's path, and even as there are profound changes in the world around the chambered nautilus, this "living fossil" of ancient geologic history thrives. ...
- The chambered nautilus is the symbol chosen by the John Templeton Foundation. ...
3. Chambered exhaust. - Second Generation Camaro Owners Group Message Board
- www.nastyz28.com
- Chambered exhaust. ...
- Topic: Chambered exhaust. ...
- We've both heard a factory 69 Z with chambered exhaust. But we are wondering if the aftermarket chambered mufflers sound the same as the ones put on the Z's?.
- Makes a chambered exhaust, and I believe Summit is selling chambered mufflers now too. The GMMG site has sound clips and vidoes of 4th Gen Fbods with their chambered exhaust kits. ...
- posted February 24, 2005 08:20 PM I checked into chambered exhaust also. ...
4. Classic Chambered Exhaust Inc. - Home Page
- www.classicchambered.com
- Manufacturers of the chambered muffler!.
- Classic Chambered Exhaust manufactures a series of unique mufflers called POWERSTICKS -based on the original concept of chambered exhaust that first appeared on high performance GM vehicles of the 1960’s. Chambered exhaust produces a very unique & aggressive note – unlike anything else used in exhaust tuning! Several years ago, the Turbo Tube muffler went away, a victim of corporate consolidation. This created a void in the marketplace for a reasonably priced true chambered muffler. ...
- Oval & box muffler designs cannot produce results like true chambered exhaust can. ...
- Find out why chambered exhaust is so unique & legendary among enthusiasts that have “been there. ... Chambered exhaust is functional. ...
- Classic Chambered Exhaust Inc. ...
5. Chambered pith MC
- botit.botany.wisc.edu
6. Chambered Cairns
- www.charles-tait.co.uk
- Chambered Cairns .
- Chambered Cairns date from Neolithic times with the oldest dating from about 3200BC. ...
7. Aluminum Chambered Boats, ACB Boats
- www.philaboat.com
- Aluminum Chambered Boats.
- ACB's unique chambered floatation cannot be compomised, even if the hull and a sponson are punctured!.
8. Keywords relating to "10.1219/12393516"
- doi.contentdirections.com
- Keywords relating to "Cross Section of Chambered Nautilus Shell".
- Chambered nautiluses .
9. Chambered exhaust BB 67-8 - Camaro Part Number Z00003-68 - Camaro Restoration Parts - D & R Classic Automotive
- www.drclassic.com
- Chambered exhaust BB 67-8.
- Correct reproduction of the popular chambered exhaust will fit any 67-8 cars having big block engines. ...
10. Kilmartin House - Kilchoan Chambered Cairn
- www.kht.org.uk
- Chambered Cairn.
- An imposing example of a chambered cairn clear from cairn material. ...
- A Henshall, The Chambered Tombs of Scotland vol. ...
11. Kilmartin House - Gartnagreanoch Chambered Cairn
- www.kht.org.uk
12. Wideford Hill Chambered Tomb
- www.ancient-scotland.co.uk
- Wideford Hill Chambered Tomb .
- Looking west on the western slope of Wideford Hill is a chambered tomb dug into the hillside. ...
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