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1Author    FriedrichFranz SeeligRequires cookie*
 Title    Effects in the Hydroformylation Process  
 Abstract    The complicated and partially controversial formulations of the various steps and branchings in the hydroformylation process are comprised in a reaction scheme that ne-glects the production of different isomers and isomerisations of olefins and is a compromise between the given complexity and a theoretical tractability. Special consideration is devoted to the inhibition of the process by one of its substrates, CO. In a first approxima-tion complete inertness of the Co-tetracarbonyls is assumed and the existence of bistability and hysteresis for particular parameter combinations is proved. In the further treatment this approximation is again relaxed. Technological consequences of the analysis are discussed. 
  Reference    (Z. Naturforsch. 31b, 336—341 [1976]; received October 21 1975) 
  Published    1976 
  Keywords    Hydroformylation, Oxo-synthesis, System Theory, Stability Analysis, Hysteresis 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0336.pdf 
 Identifier    ZNB-1976-31b-0336 
 Volume    31 
2Author    HansJürgen Bestmann, Klaus DippoldRequires cookie*
 Title    Temperature Dependence of Electrophysiological Responses of Lepidopteran Antennae  
 Abstract    By recording the temperature dependence of electroantennograms with Lepidoptera antennae optimum curves were obtained, and a hysteresis phenomenon was observed by passing tempera­ ture cycles. The latter also occur with single cell recording (electrosensillogram) in the receptor potentials as well as in the number of action potentials released per second. The results of the measurements are discussed on a molecular level, a scheme reflects the molecular processes which eventually are involved in the interaction of a signal molecule and receptor region. 
  Reference    Z. Naturforsch. 44c, 333 (1989); received January 31 1989 
  Published    1989 
  Keywords    Electroantennogram, Electrosensillogram, Optimum Curves, Hysteresis, Temperature Dependence 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0333.pdf 
 Identifier    ZNC-1989-44c-0333 
 Volume    44 
3Author    LeszekA. Kleczkowski, Per Villand, Odd-Arne OlsenRequires cookie*
 Title    Hysteresis and Reversible Cold-Inactivation of ADP-Glucose Pyrophosphorylase From Barley Seeds  
 Abstract    A A DP-glucose pyrophosphorylase (A G P) from barley (Hordeum vulgare L.) seed endosperm showed a lag in activity when assayed after storage at -2 0 °C. The cold-stored enzyme could regain most, or all, o f its activity during 4 0 -6 0 min follow ing exposure to ambient tempera­ tures. The lags were not observed when 2 m M M gCl2 was added to the storage buffer before freezing. Storage at -2 0 °C, in the absence o f M gCl2, led to the appearance o f a low activity A GP form which was activated up to 3-fold by 3-phosphoglycerate (PG A) and had high K m values with ATP o f 0.3 and 1.2 m M (with and without PGA, respectively). In contrast, storage at -2 0 °C in the presence o f M gC l2 or incubation at +20 °C resulted in an active enzyme which was only weakly activated by PGÄ (up to 30%) and had the respective K m values with ATP o f 0.1 and 0.3 m M . It is suggested that low temperature may induce a change in the conform ation and/or oligomerization state o f the A G P protein, resulting in a low activity enzyme form which has distinct regulatory and kinetic properties. 
  Reference    Z. Naturforsch. 48c, 457 (1993); received February 3/March 22 1993 
  Published    1993 
  Keywords    D P-G lucose Pyrophosphorylase, Cold Lability, Hysteresis, Starch 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0457.pdf 
 Identifier    ZNC-1993-48c-0457 
 Volume    48 
4Author    J. Roth, M. Uhrmacher, R. De, La Presa, L. Ziegeler, K. P. LiebRequires cookie*
 Title    Structural Phase Transitions in BaTi0 3 Studied via Perturbed Angular Correlations  
 Abstract    Phase transitions in the ferroelectric perovskite BaTi0 3 were studied for 111 In-implanted poly-crystalline samples by measuring the electric field gradients by means of Perturbed Angular Correla-tion spectroscopy. The phase transitions between the orthorhombic rhombohedral tetragonal cubic lattices were investigated in 2 -10 K steps, for increasing and decreasing temperatures, in order to determine their hysteresis. The transition parameters are compared with results from measurements of the spontaneous polarization, electric susceptibility and neutron scattering. 
  Reference    Z. Naturforsch. 55a, 242—246 (2000); received August 24 1999 
  Published    2000 
  Keywords    Perturbed Angular Correlations, BaTi0 3, Phase Transitions, Hysteresis, 1 " In 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0242.pdf 
 Identifier    ZNA-2000-55a-0242 
 Volume    55