Plasticity in D1-Like Receptor Expression Is Associated with Different Components of Cognitive Processes

Dopamine D1-like receptors consist of D1 (D1A) and D5 (D1B) receptors and play a key role in working memory. However, their possibly differential contribution to working memory is unclear. We combined a working memory training protocol with a stepwise increase of cognitive subcomponents and real-time RT-PCR analysis of dopamine receptor expression in pigeons to identify molecular changes that accompany training of isolated cognitive subfunctions. In birds, the D1-like receptor family is extended and consists of the D1A, D1B, and D1D receptors. Our data show that D1B receptor plasticity follows a training that includes active mental maintenance of information, whereas D1A and D1D receptor plasticity in addition accompanies learning of stimulus-response associations. Plasticity of D1-like receptors plays no role for processes like response selection and stimulus discrimination. None of the tasks altered D2 receptor expression. Our study shows that different cognitive components of working memory training have distinguishable effects on D1-like receptor expression

Report and preliminary results of METEOR-cruise M 29/1: Buenos-Aires -Montevideo, 17.6.-13.7.94

During METEOR cruise M 29/1 the shipboard acoustical systems HYDROSWEEP and PARASOUND were used on a 24 hour schedule to record continuous high resolution bathymetric and sediment echosounding profiles. The digitization and storage of the echosounding seismograms were realized by usage of the software package PARADIGMA (Spiess, 1992). The underway geophysical program along several profiles on the Argentine continental margin serves the long term research program Sonderforschungsbereich 261, the complete coverage of the South Atlantic Ocean with a net of sampling stations and geophysical profiles. Along the profiles the recorded data provided valuable information for finding suitable coring stations from different sedimental environments on the continental margin, which can be well discriminated by their different echotypes. (orig.)Available from TIB Hannover: RO 7630(58) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDeutsche Forschungsgemeinschaft (DFG), Bonn (Germany)DEGerman

Report and preliminary results of METEOR-cruise M 34/4, Recife - Bridgetown, 19.3.-15.4.1996

During the RV Meteor cruise 34/4 an extensive sediment sampling program was carried out in order to reconstruct surface and deep-water circulation in the western equatorial Atlantic. Six complete sediment-time series were obtained from traps moored during M 29/3. Box corer, multicorer and gravity corer were used to recover surface and late Quaternary sediments (between 35 and 3300 m) from the continental slope off Northeast Brasil, from the Amazon estuary and fan, and from the Caribbean continental slope off Barbados. Samples from the surface sediments and from the water column were taken to study stable isotope composition in relation to organic matter degradation processes. By the shipboard echosounder system Hydrosweep and Parasound, bathymetry and sediment structures of the ocean floor were continuously recorded. Micropaleontologic studies were directed on the distribution of dinoflagellates and on the composition of coccolithophore communities. (WEN)Available from TIB Hannover: RO 7630(80) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Bericht und erste Ergebnisse der Meteor-Fahrt M 16/2 Recife-Belem, 28.4. - 21.5. 1991

With 97 Figs., 11 tabs.SIGLEAvailable from TIB Hannover: RO7630(19) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Report and preliminary results of METEOR Cruise M 41/1, Malaga - Libreville, 13.2. - 15.3.1998 With partial results of METEOR Cruise 41.2, Libreville - Vitoria, 18.03.1998-15.04.1998

Available from TIB Hannover: RO 7630(114) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Cruise report of R/V SONNE Cruise 102, Valparaiso - Valparaiso, 9.5. -28.6.95

The near coastal upwelling region off Chile and Peru is one of the most productive regions of the world ocean. In cooperation between the University of Bremen and institutes in Chile, Denmark and Sweden the carbon cycle in this, on a global scale, important area will be studied. The aim of this studies is the investigation of the present day cycling of carbon and the reconstruction of paleoenvironmental conditions, focusing on paleoproductivity, through the late Quaternary climatic cycles. Only very little is known so far about the southern part of the Peru/Chile current and about its youngest geological history. Because this is one of the most important high productivity regions of the world ocean, a detailed knowledge about the paleoproductivity is necessary to assess the role of this system throughout the late Quaternary climatic variations. A detailed study of the oceanographic and biologic conditions about the entire width of the Peru/Chile current in combination with surface sediment data will help to understand the present-day sedimentation processes with this region. In addition, this expedition provided the excellent opportunity to repeat the oceanographic measurements done during the SCORPIO cruise 28 years ago. By this repetition, variations in water mass structure and composition and changes as e.g. global warming can be detected. (orig.)SIGLEAvailable from TIB Hannover: RO 7630(68) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Report and preliminary results of METEOR-cruise M 23/3. Recife - Las Palmas, 21.3.-12.4.93

Available from TIB Hannover: RO 7630(44) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman