TY  - GEN
A1  - Kort, C. A. D. de
A1  - Peter, Martin G.
A1  - Koopmanschap, A. B.
T1  - Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: a re-examination
N2  - The haemolymph of the adult Colorado potato beetle, Lepinotarsa decemlineata Say, contains a high molecular weight (MW > 200,000) JH-III specific binding protein. The Kd value of the protein for racemic JH-III is 1.3 ± 0.2 × 10−7 M. It has a lower affinity for racemic JH-I and it does not bind JH-III-diol or JH-III-acid. The binding protein does discriminate between the enantiomers of synthetic, racemic JH-III as was determined by stereochemical anaysis of the bound and the free JH-III. Incubation of racemic JH-III with crude haemolymph results in preferential formation of (10S)-JH-III-acid, the unnatural configuration. The JH-esterase present in L. decemlineata haemolymph is not enantioselective. It is concluded that the most important function of the binding protein is that of a specific carrier, protecting the natural hormone against degradation by esterases. The carrier does not protect JH-I as efficiently as the lower homologue.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 068 
KW  - Juvenile hormone
KW  - Leptinotarsa decemlineata
KW  - JH-III-specific carrier protein
KW  - enantioselectivity
Y1  - 1983
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-16777
ER  - 
TY  - GEN
A1  - Erdelen, C.
A1  - Laschewsky, André
A1  - Ringsdorf, H.
A1  - Schneider, J.
A1  - Schuster, A.
T1  - Thermal behaviour of polymeric Langmuir-Blodgett multilayers
N2  - Langmuir-Blodgett multilayers of hydrocarbon and fluorocarbon polymers with hydrophilic spacer, lipid-polyelectrolyte complexes and mesogenic polymers have been prepared. The thermal behaviour of the multilayers was studied by small angle X-ray scattering, IR and UV—visible spectroscopy. Good thermal stabilities were found for the various classes of polymers. In addition, for both complexed multilayers and mesogenic polymer films, reorientation processes were observed.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 080 
Y1  - 1989
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17378
ER  - 
TY  - GEN
A1  - Püschel, Gerhard Paul
A1  - Kirchner, C.
A1  - Schröder, A.
A1  - Jungermann, Kurt
T1  - Glycogenolytic and antiglycogenolytic prostaglandin E₂ actions in rat hepatocytes are mediated via different signalling pathways
N2  - Prostaglandin E₂ has been reported both to stimulate glycogen-phosphorylase activity (glycogenolytic effect) and to inhibit the glucagon-stimulated glycogen-phosphorylase activity (antiglycogenolytic effect) in rat hepatocytes. It was the purpose of this study to resolve this apparent contradiction and to characterize the signalling pathways and receptor subtypes involved in the opposing prostaglandin E₂ actions. Prostaglandin E₂ (10 μM) increased glucose output, glycogen-phosphorylase activity and inositol trisphosphate formation in hepatocyte cell culture andor suspension. In the same systems, prostaglandin E₂ decreased the glucagon-stimulated (1 nM) glycogen-phosphorylase activity and cAMP formation. The signalling pathway leading to the glycogenolytic effect of PGE₂ was interrupted by incubation of the hepatocytes with 4P-phorbol 12-myristate 13-acetate (100 nM) for 10 min, while the antiglycogenolytic effect of prostaglandin E₂ was not attenuated. The signalling pathway leading to the antiglycogenolytic effect of prostaglandin E₂ was interrupted by an incubation of cultured hepatocytes with pertussis toxin (100 ng/ml) for 18 h, whereas the glycogenolytic effect of prostaglandin E₂ was enhanced. The EP₁/EP₃ prostaglandin-E₂-receptor-specific prostaglandin E₂ analogue Sulproston had a stronger glycogenolytic potency than the EP₃ prostaglandin-E₂-receptor-specific prostaglandin E₂ analogue Misoprostol. The antiglycogenolytic potency of both agonists was equal. It is concluded that the glycogenolytic and the antiglycogenolytic effects of prostaglandin E₂ are mediated via different signalling pathways in hepatocytes possibly involving EP₁ and EP₃ prostaglandin E₂ receptors, respectively.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 112 
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-45853
ER  - 
TY  - JOUR
A1  - Scheller, Frieder W.
A1  - Wollenberger, Ursula
A1  - Schubert, Florian
A1  - Pfeiffer, Dorothea
A1  - Markower, Alexander
A1  - McNeil, C. J.
T1  - Multienzyme biosensors : coupled enzyme reactions and enzyme activation
Y1  - 1993
ER  - 
TY  - JOUR
A1  - Scheller, Frieder W.
A1  - Kirstein, Dieter
A1  - Schubert, Florian
A1  - Pfeiffer, Dorothea
A1  - McNeil, C. J.
T1  - Enzymes in electrochemical biosensors
Y1  - 1993
ER  - 
TY  - GEN
A1  - Henkel, Carsten
A1  - Courtois, Jean-Yves
A1  - Kaiser, Robin
A1  - Westbrook, C.
A1  - Aspect, Alain
T1  - Phase shifts of atomic de Broglie waves at an evanescent wave mirror
N2  - A detailed theoretical investigation of the reflection of an atomic de Broglie wave at an evanescent wave mirror is presented. The classical and the semiclassical descriptions of the reflection process are reviewed, and a full wave-mechanical approach based on the analytical soution of the corresponding Schrödinger equation is presented. The phase shift at reflection is calculated exactly and interpreted in terms of instantaneous reflection of the atom at an effective mirror. Besides the semiclassical regime of reflection describable by the WKB method, a pure quantum regime of reflection is identified in the limit where the incident de Broglie wavelength is large compared to the evanescent wave decay length.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 103 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42289
ER  - 
TY  - JOUR
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
T1  - High pressure study of the temperature dependence of the conductivity of template synthesized polyaniline and polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
T1  - High pressure conductivity of template synthesized polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
T1  - Dimensional crossover of the temperature dependence of the electrical conductivity of template synthesized polyaniline and polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Lorenz, Bernd
A1  - Tozer, S. W.
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
T1  - Magnetoresistance of conducting polymers
Y1  - 1994
ER  -