• Chemistry
  • We're looking forward to many exciting applications that will help scientists in computational chemistry and biophysics understand and predict the behavior of molecular systems at a fundamental level. (phys.org)
  • Metastability is common in physics and chemistry - from an atom (many-body assembly) to statistical ensembles of molecules (viscous fluids, amorphous solids, liquid crystals, minerals, etc.) at molecular levels or as a whole (see metastable states of matter and grain piles below). (wikipedia.org)
  • nuclear
  • This alternation was explained by Gerhard Herzberg and Walter Heitler as a consequence of nuclear spin isomerism. (wikipedia.org)
  • The Raman spectrum observed by Rasetti provided the first experimental evidence that this proton-electron model of the nucleus is inadequate, because the predicted half-integral spin has as a consequence that transitions from odd rotational levels would be more intense than those from even levels, due to nuclear spin isomerism as shown by Herzberg and Heitler for dihydrogen. (wikipedia.org)
  • In 1935, Feenberg went to the University of Wisconsin-Madison for a year, where he continued his work on nuclear structure and energy levels. (wikipedia.org)
  • There, he drew on his studies of isomerism and nuclear structure and the nature of beta-decay transitions to provide the foundations for building a modern shell theory of the nucleus. (wikipedia.org)
  • Rev. 51 597 (1937) doi:10.1103/PhysRev.51.597 Eugene P. Wigner and Eugene Feenberg Symmetry properties of nuclear levels, Rep. Prog. (wikipedia.org)
  • He then entered the University of California, Berkeley, where he earned his Doctor of Philosophy (PhD) degree, writing his thesis on "Studies of nuclear isomerism in tellurium, element 43, and zinc", under the supervision of George Ernest Gibson. (wikipedia.org)
  • This competition ended abruptly when Segrè's group at Los Alamos discovered that high levels of a hitherto undiscovered plutonium-240 isotope in reactor-produced plutonium meant that an implosion-type nuclear weapon was required, and a high degree of purity was therefore unnecessary. (wikipedia.org)
  • trans
  • The PUFA precursors to the eicosanoids include: Arachidonic acid (AA), i.e. 5Z, 8Z,11Z,14Z-eicosatetraenoic acid is ω-6 fatty acid, with four double bonds in the cis configuration (see Cis-trans isomerism) each located between carbons 5-6, 8-9, 11,-12, and 14-15. (wikipedia.org)
  • Arachidonic acid has 4 cis double bonds (see Cis-trans isomerism which are abbreviated with the notation Z in the IUPAC Chemical nomenclature used here. (wikipedia.org)
  • spin
  • For dihydrogen, each nucleus is a proton of spin 1/2, so that it can be shown using quantum mechanics and the Pauli exclusion principle that the odd rotational levels are more populated than the even levels. (wikipedia.org)
  • double
  • Cytochrome P450 epoxygenases attack these double bonds to form their respective eicosatrienoic acid epoxide regioisomers (see Structural isomer, section on position isomerism (regioisomerism)) viz. (wikipedia.org)
  • found
  • Betaprodine produced more euphoria and side effects than alphaprodine at all dose levels and it was found that 5 to 10 mg of betaprodine equals 25 to 40 mg of alphaprodine. (wikipedia.org)