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'Temperature Dependence' in keywords Facet   section ZfN Section C  [X]
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1990 (1)
1989 (1)
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    R. Fromme, G. RengerRequires cookie*
 Title    Studies on Herbicide Binding in Photosystem II Membrane Fragments from Spinach  
 Abstract    The mechanism of atrazine binding and its modification by Chelex-100-induced Ca2+ deple­ tion and proteolytic degradation by trypsin, was analyzed in PS II membrane fragments from spinach. It was found: 1) Chelex-100 treatment leads in a comparatively slow process (/, 2 = 5 — 10 min) to Ca2+ re­ moval from a site that is characterized by a high affinity as reflected by K u values of the order of 10 7 M. The number of these binding sites was found to be almost one per PS II in samples washed twice with Ca2+ -free buffer. 2) Chelex-100 treatment does not affect the affinity of atrazine binding but increases the susceptibility to proteolytic attack by trypsin. 3) The electron transport activity is only slightly affected by Chelex-100 treatment. 4) The atrazine binding exhibits a rather small T-dependence within the physiological range of 7 °C to 27 °C. The implications of these findings for herbicide binding are discussed. 
  Reference    Z. Naturforsch. 45c, 373—378 (1990); received November 15 1989 
  Published    1990 
  Keywords    Atrazine Binding, Photosystem II, Ca2+ Effects, Temperature Dependence, Mild Proteolysis 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0373.pdf 
 Identifier    ZNC-1990-45c-0373 
 Volume    45