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1974 (1)
1Author    FalkH. KoenemannRequires cookie*
 Title    Unorthodox Thoughts about Deformation, Elasticity, and Stress  
 Abstract    The nature of elastic deformation is examined in the light of the potential theory. The concepts and mathematical treatment of elasticity and the choice o f equilibrium conditions are adopted from the mechanics o f discrete bodies, e. g., celestial mechanics; they are not applicable to a change o f state. By nature, elastic deformation is energetically a Poisson problem since the buildup of an elastic potential implies a change of the energetic state in the sense of thermodynamics. In the Euler-Cauchy theory, elasticity is treated as a Laplace problem, implying that no change of state occurs, and there is no clue in the Euler-Cauchy approach that it was ever considered as one. The Euler-Cauchy theory of stress is incompatible with the potential theory and with the nature of the problem; it is therefore wrong. The key point in the understanding of elasticity is the elastic potential. 
  Reference    Z. Naturforsch. 56a, 794—808 (2001); received January 25 2001 
  Published    2001 
  Keywords    Potential Theory, Elasticity, Stress, Poisson Equation, Cauchy Theory 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0794.pdf 
 Identifier    ZNA-2001-56a-0794 
 Volume    56 
2Author    Giinther Harisch, Jürgen ScholeRequires cookie*
 Title    Der Glutathionstatus der Rattenleber in Abhängigkeit vom Lebensalter und von akuter Belastung The Status of Glutathione of the Rat Liver and its Dependence on the Age and Acute Stress  
 Abstract    The status of glutathione in the liver of male rats as a function of their age and acute stress was investigated. Total glutathione (TG), which is measured after the reduction of liver homo-genate with NaBH4 , reduced glutathione (GSH) and disulfide glutathione (GSSG) increase with advancing age of the test animals (weights from 15 g to 350 g). The mixed glutathione disulfides [XSSG = T G — (GSH + 2 G SS G)] of all ages amount to 2.0 fimol/g liver. Subsequent to the application of a stress with Vaccineurin I I I i.p. (weigth of 120 g), the TG values remain the same over a period of 24 hours; GSH decreases 30 min after the stress has been applied, whereas GSSG and XSSG increase. 60 min after the application of Vacci-neurin, all values are within the controlled limits. 24 hours after the stress has been applied, GSH has increased and XSSG has decreased to 0.76 fxmol/g fresh weight, whereas GSSG remains within the controlled limits. The causes of these changes in the status of glutathione are discussed. 
  Reference    (Z. Naturforsch. 29c, 261 [1974]; eingegangen am 2. Januar 1974) 
  Published    1974 
  Keywords    Glutathione Status, Age Dependence, Stress, Rat Liver 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0261.pdf 
 Identifier    ZNC-1974-29c-0261 
 Volume    29 
3Author    Alf HamannRequires cookie*
 Title    Stress-Induced Changes in Cell Titer of Crayfish Hemolymph  
 Abstract    Cell titer in peripheral hemolymph of crayfishes rises in less than one hour after administration of stress. The stress may be wounding or handling of the animals. 
  Reference    (Z. Naturforsch. 30c, 850 [1975]; received August 11 1975) 
  Published    1975 
  Keywords    Crayfish, Hemolymph Coagulation, Hemocytes, Stress, Hormonal Regulation 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0850_n.pdf 
 Identifier    ZNC-1975-30c-0850_n 
 Volume    30 
4Author    AdH C M Schapendonk3, M. Arcel, VanO. Ijen, SanderC. Pot3, Riki Van Den Boogaardb, Jerem, H. ArbinsonbRequires cookie*
 Title    Nitrogen Shortage in a Tomato Crop; Scaling up from Effects on Electron-Transport Rate to Plant Productivity  
 Abstract    Optimization of nitrogen supply in a tomato plant is stepwise assessed, from chloroplast characteristics to whole crop performance. Experiments are reported in which important key processes are quantified in relation to the nitrogen content of leaves. Interactions of N effects with leaf aging and canopy light distribution are analyzed. A simulation model that integrates this knowledge is constructed. The results of three nitrogen partitioning scenarios for Rubisco suggest that optimization of the distribution of Rubisco between leaf layers is less important for plant productivity than within-leaf optimiza­ tion of the photosynthetic apparatus. 
  Reference    Z. Naturforsch. 54c, 840—8 (1999); received November 12 1998/March 3 1999 
  Published    1999 
  Keywords    Stress, Nitrogen Optimization, Photosynthesis, Tomato, Modelling 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0840.pdf 
 Identifier    ZNC-1999-54c-0840 
 Volume    54