Questions not related to Bruker folders:
1. The subject of moving supercon magnets cold and at field comes up from
time to time here. All my experience has been with vertical bore magnets
under 2,000 pounds. Does anyone have first hand experience with moving
heavier horizontal bore magnets? The magnet in question is a shielded 7 T
Oxford magnet belonging to an FT-MS, but I would be interested to hear
about moving e.g. small bore animal imaging systems of similar size.
2. An adult typically has a "total body water" volume of about 40 liters.
D2O can act as a freely diffusible tracer (in small doses) and measuring
how much a known dose of D2O raises the 2H content of serum above
background level has been used to calculate total body water. Do any in
vivo NMR gurus out there have a feel for what fraction of protons with
potential for H/D exchange are on macromolecules (amides, hydroxyls,
whatever) compared with the fraction on water molecules? I realize the
answer could vary widely depending on tissue type--I am just looking for
any more informed estimate than me saying "maybe it's in the 5% range."
David VanderVelde
Manager, NMR Facility, Caltech
davidv_at_caltech.edu
Received on Wed Oct 28 2015 - 11:55:44 MST