Bielefeld University

About: Bielefeld University is a education organization based out in Bielefeld, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Population & Quantum chromodynamics. The organization has 10123 authors who have published 26576 publications receiving 728250 citations. The organization is also known as: University of Bielefeld & UNIVERSITAET BIELEFELD.

Avian Ultraviolet/Violet Cones Identified as Probable Magnetoreceptors

Abstract: Background: The Radical-Pair-Model postulates that the reception of magnetic compass directions in birds is based on spin-chemical reactions in specialized photopigments in the eye, with cryptochromes discussed as candidate molecules But so far, the exact subcellular characterization of these molecules in the retina remained unknown Methodology/Principal Findings: We here describe the localization of cryptochrome 1a (Cry1a) in the retina of European robins, Erithacus rubecula, and domestic chickens, Gallus gallus, two species that have been shown to use the magnetic field for compass orientation In both species, Cry1a is present exclusively in the ultraviolet/violet (UV/V) cones that are distributed across the entire retina Electron microscopy shows Cry1a in ordered bands along the membrane discs of the outer segment, and cell fractionation reveals Cry1a in the membrane fraction, suggesting the possibility that Cry1a is anchored along membranes Conclusions/Significance: We provide first structural evidence that Cry1a occurs within a sensory structure arranged in a way that fulfils essential requirements of the Radical-Pair-Model Our findings, identifying the UV/V-cones as probable magnetoreceptors, support the assumption that Cry1a is indeed the receptor molecule mediating information on magnetic directions, and thus provide the Radical-Pair-Model with a profound histological background

Review: Gabriele Lucius-Hoene & Arnulf Deppermann (2002). Rekonstruktion narrativer Identität. Ein Arbeitsbuch zur Analyse narrativer Interviews [The Reconstruction of Narrative Identity. A Guide to the Analysis of Narrative Interviews]

Abstract: Das narrative Interview stellt seit langem ein beliebtes und wichtiges Instrument in der qualitativen Sozialforschung dar. Gabriele LUCIUS-HOENE und Arnulf DEPPERMANN verbinden das narrative Interview in diesem Band mit dem Konzept der narrativen Identitat: Autobiographisches Erzahlen wird so als Nahrboden aufgefasst, auf dem Identitatskonstruktionen entstehen und zugleich dargestellt werden. Aufgrund der Fulle und Vielfalt auch neuerer identitatsorientierter Forschungsfragen legen die Autoren in diesem Band ein methodisch reflektiertes und flexibles Auswertungsinstrumentarium vor, das speziell auf solche Fragen ausgerichtet ist. Hierbei beziehen sie Erkenntnisse aus der Erzahl- und Gesprachsforschung sowie der diskursiven Psychologie mit ein. In der Form eines Arbeitsbuchs stellen sie forschungspraktische Fragen und analytische Verfahren zusammen und wenden sich damit in erster Linie an qualitativ Forschende, die sich fur Identitatsarbeit in verbaler Interaktion interessieren. In gleichem Mase nutzlich erscheint es aber auch fur alle, die eine reflektierte Zusammenstellung von Forschungsergebnissen aus verschiedenen diskursiven Disziplinen suchen. URN: urn:nbn:de:0114-fqs030354

The Clavibacter michiganensis Subspecies: Molecular Investigation of Gram-Positive Bacterial Plant Pathogens

Abstract: Clavibacter michiganensis subspecies are actinomycete plant pathogens residing mainly in the xylem vessels that infect economically important host plants In the Clavibacter subspecies michiganensis and sepedonicus, infecting tomato and potato, respectively, essential factors for disease induction are plasmid encoded and loss of the virulence plasmids converts these biotrophic pathogens into endophytes The genes responsible for successful colonization of the host plant, including evasion/suppression of plant defense reactions, are chromosomally encoded Several serine proteases seem to be involved in colonization They are secreted by Clavibacter, but their targets remain unknown A type 3 secretion system (T3SS) translocating effectors into the plant cells is absent in these gram-positive pathogens With the development of the modern ‘omics technologies for RNA and proteins based on the known genome sequences, a new phase in the investigation of the mechanisms of plant pathogenicity has begun to allow the genome-wide investigation of the Clavibacter-host interaction