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Is the D enrichment a transpiration issue (ie does it vary with the average humidity of the environment)? The best way to test this of couse is to come to Phoenix in August (temp = 110F and Humidity =0). At 11:23 AM 01/24/2001 -0500, you wrote: >Back in the Triassic, when I was a girl with a different name, I measured >dD of blood, urine, and saliva. Whenever any of my colleagues cut their >fingers, I appeared with a capillary tube. It was not a problem to spin >down the blood (which goes quickly) and take a few microliters off the top >for isotope analysis. So, Susan spin quickly, refrigerated 'fuge if >possible. > >Here'a a bit of history regarding Tom Hoering, and is connected to the >urine measurements. He was an accomplished glassblower, but often times he >would set his tie on fire or slice his fingers when making vacuum lines. He >INSISTED on providing a urine sample along with the blood of opportunity. >I, on the other hand, INSISTED that he spin down his own urine and seal the >sample in the capillary. > >I also had a connection with NIH to collect bllod samples for me before the >days of HIV/AIDS so I had a host of blood samples from people in the >Washington, DC area. The summary of my findings were simple--blood and >urine and saliva were all about 7-8 per mil enriched in deuterium relative >to drinking water. People who talked alot (AKA verbal diarrhea) were >enriched in D by another 7 or 8 permil. > >You might imagine why this work was never published. > >Marilyn Fogel > >Dr. Marilyn L. Fogel, Senior Scientist >Carnegie Institution of Washington >Geophysical Laboratory >5251 Broad Branch Rd., NW >Washington, DC 20015 >USA >1-202-478-8981 >FAX 202-478-8901 >Main Office 1-202-478-8900 > Dr. Peter Kroopnick IT Corporation Home: [log in to unmask] Work: [log in to unmask]