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1997 (2)
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1981 (1)
1Author    D. Girlich, H.-D Lüdemann, C. Buttersack, K. BuchholzRequires cookie*
 Title    c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions  
 Abstract    The self diffusion coefficients D of the water molecules and of sucrose have been deter­ mined by the pulsed field gradient NMR technique over a wide range of temperatures and concentrations (cmax: 70% w/w sue.). All temperature dependencies can be fitted to a Vogel-Tammann-Fulcher equation. The isothermic concentration dependence of D for the sucrose is given by a simple exponential concentration dependence. 
  Reference    Z. Naturforsch. 49c, 258—264 (1994); received December 21993 
  Published    1994 
  Keywords    Diffusion, Sucrose, Water, Aqueous Solution 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0258.pdf 
 Identifier    ZNC-1994-49c-0258 
 Volume    49 
2Author    Dieter Strack, Gesine Sachs, Axel Römer, Rolf WiRequires cookie*
 Title    Ferulic Acid-Sucrose Esters from Immature Anthers of Tulipa cv. "Apeldoorn"  
 Abstract    Two ferulic acid conjugates have been isolated from the extract of immature anthers of Tulipa cv. "Apeldoorn" and their structures elucidated using chromatography, electron impact mass spectrometry, and NMR spectroscopy. These two conjugates are 6,3'-diferuloylsucrose and 6,3',4'-triferuloylsucrose. High performance liquid chromatographic analysis of the extract showed that these esters are transient major constituents of the phenylpropanoid pattern of the immature anthers and are present in the ratio of 1:2. Previous investigations showed that these components are accumulated in the loculus. 
  Reference    Z. Naturforsch. 36c, 721—723 (1981); received April 30 1981 
  Published    1981 
  Keywords    Tulipa, Liliaceae, Hydroxycinnamic Acid Conjugates, Ferulic Acid Esters, Sucrose 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0721.pdf 
 Identifier    ZNC-1981-36c-0721 
 Volume    36 
3Author    W. Nikolaus Kiihn-VeltenRequires cookie*
 Title    Effects of Compatible Solutes on Mammalian Cytochrome P450 Stability  
 Abstract    The sensitivity of pig cytochrome P450cl7 (CYP17), an endoplasmic reticulum membrane-bound enzyme, towards heat denaturation (48 °C) was measured by the P450-to-P420 spectral transition indicating conforma­ tional labilization of the protein. Both sucrose and glu­ cose have comparable and increasingly protective effects at concentrations ranging from 100 to 800 mM, while ec­ toine, a novel zwitterionic compatible solute which regu­ lates bacterial osmoadaptation and stabilizes cyto­ plasmic enzymes, has a strong labilizing effect on CYP17 and favours its proteolytic inactivation possibly by elec­ trostatic derangements. Sucrose or glucose, but not ec­ toine, can therefore eventually be proposed as compati­ ble stabilizers of cytochrome P450 structures. 
  Reference    Z. Naturforsch. 52c, 132—135 (1997); received September 18/November 18 1996 
  Published    1997 
  Keywords    Cytochrome P450 Protein Stability, Osmolytes, Ectoine, Sucrose 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0132_n.pdf 
 Identifier    ZNC-1997-52c-0132_n 
 Volume    52 
4Author    Yuko Fukushima3, Hamako Sasamotob, Shigeyuki Babac, Hiroshi Ashihara3Requires cookie*
 Title    The Effect of Salt Stress on the Catabolism o f Sugars in Leaves and Roots of a Mangrove Plant, Avicennia marina  
 Abstract    Respiration and related aspects of metabolism were investigated in the roots and leaves o f 2-year-old trees of the mangrove plant, Avicennia marina in the presence o f 100, 250 and 500 mM NaCl. The rate of respiration o f leaves increased with increasing concentrations of NaCl in the incubation medium, but respiration of roots was not similarly affected. In order to examine the relative rates of catabolism of glucose by the glycolysis-tricarboxylic acid (T C A) cycle and the oxidative pentose phosphate pathway (P P pathway), we determined the rates o f release of 14C 0 2 from [1-14C]glucose and from [ 6 -14C]glucose in segments of roots and leaves. The ratios of rates (C ^ Q) in roots varied from 0.30 to 0.44, while ratios of 0.85 to 0.99 were obtained when leaves were incubated in the presence o f various concentra­ tions o f NaCl. It appeared that the PP pathway was more involved in sugar catabolism in the roots than in the leaves of A. marina. Uniformaly 14C-labelled sucrose, incubated with segments of roots and leaves for 18 h, was converted to C 0 2, amino acids (mainly glutamine), organic acids (mainly malic acid), sugars and ethanol-insoluble macromolecules. The incorpo­ ration o f radioactivity into most of these components was not significantly affected by NaCl. However, in leaves (but not in roots) the release o f 14C 0 2 from [ U -14C]sucrose was en­ hanced by NaCl at 250 mM and 500 m M , while the rate o f incorporation o f radioactivity into macromolecules was reduced by high concentrations o f NaCl. Incorporation of radioactivity from [ U -14C]sucrose into malic acid was enhanced in both roots and leaves by an increase in the concentration o f NaCl from 100 mM to 500 mM (this concentrations is similar to that in sea water). Independent of the concentration of NaCl, more than half o f the radioactivity in the neutral fraction from leaves was incorporated into an unidentified sugar, while in the same fraction from roots, the radioactivity was associated with glucose, fructose and sucrose. On the basis o f these results, a discussion is presented o f the characteristics of catabolism of sugars in A. marina in relation to salt resistance. 
  Reference    Z. Naturforsch. 52c, 187—192 (1997); received October 29/November 25 1996 
  Published    1997 
  Keywords    Avicennia marina, Grey Mangrove, Respiration, Sucrose, Catabolism 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0187.pdf 
 Identifier    ZNC-1997-52c-0187 
 Volume    52