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'Temperature dependence' in keywords Facet   Publication Year 1989  [X]
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1989[X]
1Author    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 
2Author    L. Xie, W. H. SaundersRequires cookie*
 Title    Is  
 Abstract    o to p e E ffe c ts in K in e tic E n o la te F o r m a tio n fro m 2 -P e n ta n o n e a n d 2 -P e n t a n o n e -l , l , l -d 3 This paper is dedicated to Professor Jacob Bigeleisen on the occasion of his 70th birthday 2-Pentanone and 2-pentanone-l,l,l-d3 were treated with three-fold excesses of lithium diiso-propylamide (LDA) or lithium hexamethyldisilazide (LHMDS) in tetrahydrofuran (THF) with and without hexamethylphosphoric triamide (HMPA, 3 mol per mol of base) at temperatures ranging from 24 to — 70 °C. The deuterium kinetic isotope effects calculated from the product ratios (mea­ sured by GLC as trimethylsilyl enol ethers) showed a range of temperature dependences: none (LDA in THF), attenuated with A^jA^ = 2.53 (LHMDS in THF), and normal with /1H//1D~0.6 indicating moderate tunneling (LDA and LHMDS in THF-HMPA). The variation in temperature dependence is attributed to reaction via multiple base species in which HMPA affects the equilibria between the base species. 
  Reference    Z. Naturforsch. 44a, 413 (1989); received January 13 1989 
  Published    1989 
  Keywords    Isotope Effects, Kinetic Enolates, Temperature Dependence, Lithium Dialkylamide Bases 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0413.pdf 
 Identifier    ZNA-1989-44a-0413 
 Volume    44