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1Author    S. Alanko, R. Paso, R. AnttilaRequires cookie*
 Title    A Diode Laser-Grating Study of the v2 + v5 Band of C2D2  
 Abstract    The region o f the v2 + v5 band o f deuterated acetylene C 2D 2 around 2305 cm -1 has been studied using a diode laser-grating spectrometer. The grating spectrum covered the whole range o f the band. The structure of the Q branch as well as the Q branches of the hot bands v2 + 2v5 <-v5 and v2 + v4 + v5 «-v4 together with some special parts have been investigated with the diode laser, too. Molecular constants for the v2 + v5 band with small improvements in the ground state constants are presented. The hot bands were analyzed by taking the /-resonances into account. 
  Reference    Z. Naturforsch. 42a, 1247—1252 (1987); received July 11 1987 
  Published    1987 
  Keywords    D iode laser, Infrared spectrum, Rotation-vibration spectrum, Deuteroacetylene, /-resonance 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-1247.pdf 
 Identifier    ZNA-1987-42a-1247 
 Volume    42 
2Author    N. G. FazleyevRequires cookie*
 Title    Theoretical Study of the Indirect Quadrupole-Quadrupole Interactions in Metals and Alloys  
 Abstract    The indirect multipole interactions of nuclei and impurity paramagnetic ions in metals and alloys via conduction electrons are investigated by means of the dielectric function method. The Hamilto-nian of the indirect quadrupole-quadrupole interaction of impurity paramagnetic ions and nuclei is constructed selfconsistently, taking into account the exchange interactions and correlations of the conduction electrons as well as the antishielding effects. It is shown that the energy of these indirect quadrupole interactions of the nuclei and the paramagnetic ions decreases with the distance as R ~ 3 , oscillating with a period which is determined by the wave vector on the Fermi surface and the distance R. The influence of these indirect quadrupole-quadrupole interactions on the width and shape of the NMR lines is studied. 
  Reference    Z. Naturforsch. 45a, 380—384 (1990); received August 23 1989 in revised form December 1 1989 
  Published    1990 
  Keywords    Quadrupole, Interactions, Nuclei, Metals, Resonance 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0380.pdf 
 Identifier    ZNA-1990-45a-0380 
 Volume    45 
3Author    W. Grundier, F. KeilmannRequires cookie*
 Title    Nonthermal Effects of Millimeter Microwaves on Yeast Growth  
 Abstract    Weak microwave irradiation of aqueous yeast cultures was found to affect their growth rate in a frequency-selective manner. Depending on frequency (near 42 GHz), both increases and de­ creases of the growth rate were observed. The resonance bandwidths are of the order of 0.01 GHz. Simple thermal effects can be excluded. These findings support theoretical predictions of coherent molecular oscillations activating metabolic processes. 
  Reference    Z. Naturforsch. 33c, 15 (1978); received September 5/October 10 1977 
  Published    1978 
  Keywords    Cell Biology, Cell Growth, Microwave Interaction, Resonance, Coherence 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0015.pdf 
 Identifier    ZNC-1978-33c-0015 
 Volume    33 
4Author    M. Ikko Koskinen3, IlpoM. Utikainenb, Hannu EloaRequires cookie*
 Title    Crystal and Molecular Structure of Aminoguanidine Sulphate, an Important Enzyme Inhibitor and Starting Material of Drug Syntheses  
 Abstract    Aminoguanidine is not only an agent with a variety of pharmacological effects but also an im portant starting material of am idinohydrazone-type drugs and enzyme inhibitors. There­ fore, we have now synthesized am inoguanidine sulphate CN4H 82+.S 0 42~ and determined its structure by single-crystal X-ray diffraction. The doubly protonated (dication) form o f am ino­ guanidine that is present in the sulphate could, in principle, exist in the form of several differ­ ent tautom ers. The crystal studied consisted exclusively of one tautomer: one of the nitrogens of the hydrazine moiety bears three hydrogen atoms while the other one (the one bound to the carbon) bears one hydrogen. The other two nitrogens are bound to two hydrogens each. The predominance of this tautom er can be explained by the very strong resonance in it. The dica­ tion of aminoguanidine is remarkably planar. The hydrogens of the hydrazine moeity are, however, clearly out of the plane of the other atoms. There is a strong hydrogen bond between the proton of the m onoprotonated nitrogen and one sulphate oxygen. This bond obviously causes the deviation of the hydrogen from the plane. The bonds between the carbon atom and the adjecnt nitrogens are essentially equally long, indicating that each bond has approxim ately the same am ount of double bond character. One of the positive charges of the dication is thus delocalized, being shared by all of the atoms of the C N 3 moiety. In this respect, the structure is similar to that of all bis(amidinohydrazones) whose structures have been determined. The other positive charge of aminoguanidine dication is localized at the nitrogen bearing three hydrogens. 
  Reference    Z. Naturforsch. 49b, 556—560 (1994); received December 6 1993 
  Published    1994 
  Keywords    Bis(guanylhydrazones), Diamine Oxidase Inhibitors, Nitric Oxide Synthase Inhibitors, Resonance, Tautomerism 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0556.pdf 
 Identifier    ZNB-1994-49b-0556 
 Volume    49