Browsing by Subject "H-2"

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  • IAEA DLW Database Grp; Speakman, John R.; Yamada, Yosuke; Sagayama, Hiroyuki; Pietiläinen, Kirsi H. (2021)
    The doubly labeled water (DLW) method measures total energy expenditure (TEE) in free-living subjects. Several equations are used to convert isotopic data into TEE. Using the International Atomic Energy Agency (IAEA) DLW database (5,756 measurements of adults and children), we show considerable variability is introduced by different equations. The estimated rCO(2) is sensitive to the dilution space ratio (DSR) of the two isotopes. Based on performance in validation studies, we propose a new equation based on a new estimate of the mean DSR. The DSR is lower at low body masses (
  • Birchall, Nicholas; Feil, Christoph M.; Gediga, Michael; Nieger, Martin; Gudat, Dietrich (2020)
    The reversible reaction of H(2)with a bis-phosphenium complex of chromium provides a rare example of 3d transition metal/phosphenium cooperativity. Photolysis induces the activation of H(2)and yields a spectroscopically detectable phosphenium-stabilized (sigma-H-2)-complex, readily showing exchange with gaseous H(2)and D-2. Further reaction of this complex affords a phosphine-functionalized metal hydride, representing a unique example of reversible H(2)cleavage across a 3d MP bond. The same species is also accessibleviastepwise H+/H(-)transfer to the bis-phosphenium complex, and releases H(2)upon heating or irradiation. Dihydrogen transfer from the H-2-complex to styrene is exploited to demonstrate the first example of promoting hydrogenation with a phosphenium complex.