OPUS 4 | Search

Cellular and nuclear morphology…and calcium signaling: revealing the interplay between structure and function (2012)

Markus Breit Peter von der Bengtson Anna Hagenston Hilmar Bading Gillian Queisser

Poster presentation: Calcium plays a pivotal role in relaying electrical signals of the cell to subcellular compartments, such as the nucleus. Since this one ion type is used by the cell for many processes a neuron needs to establish finely tuned calcium pathways in order to be able to differentiate multiple tasks, [1-3]. While it is known that neurons can actively change their shape upon neuronal activity, [4-7], we here present novel findings of activity-regulated nuclear morphology, [8,9]. With the help of an experimental and computational modeling approach, we show that hippocampal neurons can change the previously spherical shape of their nuclei to complex and infolded morphologies. This morphology regulation is demonstrated to be regulated by NMDA-receptor gated calcium, while synaptic and extra-synaptic NMDA-receptors elicit opposing effects on nuclear morphology, [8]. The structural alterations of the cell nucleus have significant effects on nuclear calcium dynamics. Compartmentalization of the nucleus, due to membrane infoldings, changes calcium frequencies, amplitudes and spatial distributions, [8,10]. Since these parameters have been shown to control downstream events towards gene transcription, [11,12], the results elucidate the cellular control of nuclear function with the help of morphology modulation. With respect to processes downstream of calcium, we show that histone H3 phosphorylation is closely linked to nuclear morphology. Investigating the nuclear morphologies of hippocampal neurons, two major classes were identified [9,10]. One class contains non-infolded nuclei that have the function of calcium signal integrators, while the other class contains highly infolded nuclei, which function as frequency detectors of nuclear calcium, [10]. Extending this interdisciplinary approach of investigating structure/function relationships in neurons, the effects of cellular morphology – as well as the morphology of the endoplasmic reticulum and other organelles – on neuronal calcium signals is currently being investigated. This endeavor makes use of highly detailed, three-dimensional models of neuronal calcium dynamics, including the three-dimensional morphology of the cell and its organelles.

Monitoring soil erosion in the Souss basin, Morocco, with a multiscale object-based remote sensing approach using UAV and satellite data (2011)

Sebastian D'Oleire-Oltmanns Irene Marzolff Klaus Daniel Peter Johannes B. Ries Ali Aït Hssaïne

This article presents a multiscale approach for detecting and monitoring soil erosion phenomena (i.e. gully erosion) in the agro-industrial area around the city of Taroudannt, Souss basin, Morocco. The study area is characterized as semi-arid with an annual average precipitation of 200 mm. Water scarcity, high population dynamics and changing land use towards huge areas of irrigation farming present numerous threats to sustainability. The agro-industry produces citrus fruits and vegetables in monocropping, mainly for the European market. Badland areas strongly affected by gully erosion border the agricultural areas as well as residential areas. To counteract the significant loss of land, land-leveling measures are attempted to create space for plantations and greenhouses. In order to develop sustainable approaches to limit gully growth the detection and monitoring of gully systems is fundamental. Specific gully sites are monitored with unmanned aerial vehicle (UAV) taking small-format aerial photographs (SFAP). This enables extremely high-resolution analysis (SFAP resolution: 2-10 cm) of the actual size of the gully channels as well as a detailed continued surveillance of their growth. Transferring the methodology on a larger scale using Quickbird satellite data (resolution: 60 cm) leads to the possibility of a large-scale analysis of the whole area around the city of Taroudannt (Area extent: ca. 350 km²). The results will then reveal possible relationships of gully growth and agro-industrial management and may even illustrate further interdependencies. The main objective is the identification of areas with high gully-erosion risk due to non-sustainable land use and the development of mitigation strategies for the study area.

Tagungsbericht : "Gegenbilder - literarisch/filmisch/fotografisch" ; Internationales und interdisziplinäres Forschungskolloquium der Bamberger Graduiertenschule für Literatur, Kultur und Medien, 8./9. Juni 2012 in Bamberg (2012)

Kathrin Wimmer

Wir leben in einer Welt voller Bilder. Unser Denken funktioniert in Bildern, die menschliche Kommunikation bedient sich verschiedener Sprachbilder und das mediale Zeitalter überrollt uns mit einer wahren Flut aus bewegten und unbewegten Bildern. Die Moderne greift dabei nicht nur auf den reichen Bilderschatz vergangener Jahrhunderte zurück, sondern es werden auch traditionelle Motive variiert, verändert und verworfen. Das ursprüngliche Bild wird ergänzt durch Gegenbilder und Alternativkonzepte. Letztlich ringen sie alle, Bilder und ihre Gegenbilder, um die Deutungshoheit. Die Veranstalter Corina Erk, M.A., und Christoph Naumann, M.A., eröffneten als Promovierendenvertreter der Bamberger Graduiertenschule für Literatur, Kultur und Medien den Workshop „Gegenbilder – literarisch/filmisch/fotografisch“ und stellten das anspruchsvolle Tagungsprogramm vor, das sich in fünf Sektionen gliederte. Jedes Panel näherte sich aus einer anderen Perspektive dem Themenbündel „Gegenbild“ an.

The do`s and don`ts of teaching English at the college/university level Papers from the third Chełm symposium held in april 2003), ed by Grzegorz Kleparski, NKJO-Chełm publishers, 2003, pp. 93, ISBN 83-911683-5-2. (2009)

Magdalena Mierzwa

Mind, language and metaphor : Euroconference on consciousness and the imagination, Kerkrade (the Netherlands), april 20-24, 2002. (2003)

Pedro J. Chamizo Dominguez Carmen M. Bretones Callejas

Ansätze zur Förderung akademischer Schreibkompetenz an der Hochschule : Fachtagung 2. - 3. März 2009 an der Universität Bielefeld (2010)

Report on the British Council sponsored conference held in 20-22 of may 2001 in Chełm : "the pitfalls of teaching grammar, lexis and Anglo-Saxon culture at a college level" (2002)

Grzegorz A. Kleparski Bożena Kochman-Haładyj

Report on 34th conference of the "Societas Linguistica Europea" : language study in Europe at the turn of the millennium. Towards the integration of cognitive, historical und cultural approaches to language, Katholieke Universiteit Leuven, Belgium, august 28-31, 2001. (2002)

Brigitte Nerlich Grzegorz A. Kleparski

Reformbedarf im Recht der Vormundschaft/Pflegschaft (2011)

Gisela Zenz

A demonstrator for the Micro-Vertex-Detector of the CBM experiment (2010)

Christoph Schrader Samir Amar-Youcef Norbert Bialas Michael Deveaux Ingo Fröhlich Christian Müntz Selim Seddiki Tobias Tischler Joachim Stroth

CMOS sensors are the most promising candidates for the Micro-Vertex-Detector (MVD) of the CBM experiment at GSI, as they provide an unprecedented compromise between spatial resolution, low material budget, adequate radiation tolerance and readout speed. To study the integration of these sensors into a detector module, a so-called MVD-demonstrator has been developed. The demonstrator and its in-beam performance will be presented and discussed in this work.

Conference Proceeding

Refine

Author

Year of publication

Document Type

Language

Keywords

Institute

342 search hits