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1Author    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 
2Author    H.-D LüdemannRequires cookie*
 Title    The Interaction between Pyrimidine Nucleosides and Benzene in Aqueous Solution, studied by Proton Magnetic Resonance  
  Reference    (Z. Naturforsch. 27b, 1196—1201 [1972]; received May 2/June 15 1972) 
  Published    1972 
  Keywords    Interaction, nucleosides, benzene, water, PMR 
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 TEI-XML for    default:Reihe_B/27/ZNB-1972-27b-1196.pdf 
 Identifier    ZNB-1972-27b-1196 
 Volume    27 
3Author    Wilhelm Menke, Alfons Radunz, GeorgH. Schmid, Friederike Koenig, Rolf-Dieter HirtzRequires cookie*
 Title    Intermolecular Interactions of Polypeptides and Lipids in the Thylakoid Membrane  
 Abstract    Intermolecular interactions between chloroplast lipids and a polypeptide fraction from thylakoids were investigated by far ultraviolet circular dichroism. The polypeptide fraction was isolated from dodecyl sulfate-containing buffers. It exhibits an average molecular weight of 24 000. The circular dichroism of this polypeptide fraction measured as mean residue ellipticity is greater in the presence of sodium dodecyl sulfate than in the absence of this detergent. This effect is reversible. Addition of sulfoquinovosyl diglyceride to the dodecyl sulfate-free solution of the polypeptide also causes an increase of the circular dichroism. This increase was only observed in the pH-range between 6.9 and 7.4. The effect of dodecyl sulfate or sulfolipid on the circular dichroism is inter­ preted to indicate an increase of a-helix content. Monogalactosyl diglyceride, digalactosyl di­ glyceride and phosphatidyl glycerol gave no reaction. The attempt to obtain a conformational analysis of the polypeptide in the different states did not yield an entirely satisfactory result. Anti­ sera to sulfolipid inhibit photosynthetic electron transport of stroma-freed chloroplasts in the region of light reaction I. This inhibition is restricted to the same pH-range as the non-covalent binding of sulfolipid to the polypeptides. It appears that in the cell membrane-bound metabolic processes are regulated by this pH-dependence of the sulfolipid-polypetide interactions. 
  Reference    (Z. Naturforsch. 31c, 436 [1976]; received April 30 1976) 
  Published    1976 
  Keywords    Interactions, Polypeptides, Lipids, Thylakoid Membrane, Photosynthesis 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0436.pdf 
 Identifier    ZNC-1976-31c-0436 
 Volume    31 
4Author    BrunoW. Urzer, B. A. Sf, A. KtiengesellschaftRequires cookie*
 Title    Interpretation of Plant Growth Responses to Chemicals  
 Abstract    W hile searching for chem ical com pounds with herbicidal or growth regulating activities the researcher gladly notices if intact plants respond to the treatments at all. By means of colour slides, which unfortunately could not be printed here, changes in plant growth and leaf colour induced by chem icals were dem onstrated as they usually occur in an industrial screening operation. The range of sym ptom s shown in the presentation included sim ple lethal necrosis, "bleaching", increased generation of anthocyans, deterioration of the plant tissue, control of axillary buds, the prevention of resprouting, stunting of the shoots, and epinasties. Chem ical com pounds synthesised in the BA SF laboratories and com m ercial products were applied. 
  Reference    Z. Naturforsch. 34c, 931 (1979); received June 5 1979 
  Published    1979 
  Keywords    Plant Growth R esponse, H erbicides, Growth Regulators, Indicator Plants, Interactions 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0931.pdf 
 Identifier    ZNC-1979-34c-0931 
 Volume    34 
5Author    Bruno Perly, Patricia Le Bail-Richer, GiuseppeC. Pappalardo, Antonio GrassiRequires cookie*
 Title    Molecular Determinants for Drug Receptor Interactions, 9 1H and 13C NMR Spectra of the Narcotic Antagonist N-Allyl-N-normetazocine by Two-Dimensional Chemical Shift Correlation Spectroscopy  
 Abstract    The high frequency 'H and l3C NM R spectra (at 500 and 75.47 M Hz, respectively) of N-allyl-N-norm etazocine (NAM) hydrochloride in :H 20 solution were run and fully analyzed with the aid of both homonuclear 'H —'H and heteronuclear 13C — 'H chemical shift correlation experiments. Selective broadening of the signals of the protons in 3-, 4-, 8-, 9-, 12-positions was observed at tem peratures < 350 K. This was found to be consistent with an inversion process occurring be­ tween the N -equatorial and N -axial configurational isomers of NAM whose rate of exchange is of the same order of magnitude of the chemical shifts differences at 500 MHz. The increase of tem perature at 350 K is thus adequate to make "fast" the process in the N M R time scale and then to resolve the spectral portions. The experim ental proton-proton coupling constants were found to be consistent with a slightly distorted chair conformation of the piperidinic ring in NAM hydrochloride. The 13C NM R spectrum showed the distinct spectra of the two conform ers, which are present in the ratio of ca. 80 (N -equatorial) : 20 (N -axial). The field frequency em ployed for the experim ent was therefore sufficient to make "slow" the exchange process betw een the two isomeric forms, whose resonance peaks could be isolated in the non-acidified solution. 
  Reference    Z. Naturforsch. 42b, 1021 (1987); received D ecem ber 18 1986 
  Published    1987 
  Keywords    Drug R eceptor, Interaction, 'H NM R Spectra, 13C NM R Spectra, Narcotic Antagonist 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1021.pdf 
 Identifier    ZNB-1987-42b-1021 
 Volume    42 
6Author    Lothar Bornmann, Benno HessRequires cookie*
 Title    Interaction of Cibacron Dyes with Dehydrogenases and Kinases  
 Abstract    Cibacronblue The inhibition of the activity of various kinases and dehydrogenases by Cibacronblue 3 G-A and its structural analogues relies on the interaction of the anthrachinone moiety as well as of the neighbouring phenyl group of the dye with the proteins. Binding is intensified by hydrophobic sub­ stituents at the latter ring system. 
  Reference    (Z. Naturforsch. 32c, 756—759 [1977]; received June 27 1977) 
  Published    1977 
  Keywords    3 G-A, Inhibition, Interaction, Structural Requirement, Kinases and Dehydrogenases 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0756.pdf 
 Identifier    ZNC-1977-32c-0756 
 Volume    32