Lorenz, Bärbel

[["dc.bibliographiccitation.firstpage","1283"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Inverse Problems in Science and Engineering"],["dc.bibliographiccitation.lastpage","1305"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Jørgensen, J.S."],["dc.contributor.author","Kruschel, C."],["dc.contributor.author","Lorenz, D. A."],["dc.date.accessioned","2021-03-09T12:29:43Z"],["dc.date.available","2021-03-09T12:29:43Z"],["dc.date.issued","2015"],["dc.description.abstract","We study recoverability in fan-beam computed tomography (CT) with sparsity and total variation priors: how many underdetermined linear measurements suffice for recovering images of given sparsity? Results from compressed sensing (CS) establish such conditions for example for random measurements, but not for CT. Recoverability is typically tested by checking whether a computed solution recovers the original. This approach cannot guarantee solution uniqueness and the recoverability decision therefore depends on the optimization algorithm. We propose new computational methods to test recoverability by verifying solution uniqueness conditions. Using both reconstruction and uniqueness testing, we empirically study the number of CT measurements sufficient for recovery on new classes of sparse test images. We demonstrate an average-case relation between sparsity and sufficient sampling and observe a sharp phase transition as known from CS, but never established for CT. In addition to assessing recoverability more reliably, we show that uniqueness tests are often the faster option."],["dc.identifier.doi","10.1080/17415977.2014.986724"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/80491"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-394"],["dc.notes.intern","DOI-Import GROB-394"],["dc.relation","RTG 2088: Research Training Group 2088 Discovering structure in complex data: Statistics meets Optimization and Inverse Problems"],["dc.relation.eissn","1741-5985"],["dc.relation.issn","1741-5977"],["dc.rights","CC BY 3.0"],["dc.title","Testable uniqueness conditions for empirical assessment of undersampling levels in total variation-regularized X-ray CT"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2287"],["dc.bibliographiccitation.issue","13-14"],["dc.bibliographiccitation.journal","Journal of Adhesion Science and Technology"],["dc.bibliographiccitation.lastpage","2300"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Janshoff, Andreas"],["dc.contributor.author","Lorenz, Bärbel"],["dc.contributor.author","Pietuch, Anna"],["dc.contributor.author","Fine, Tamir"],["dc.contributor.author","Tarantola, Marco"],["dc.contributor.author","Steinem, Claudia"],["dc.contributor.author","Wegener, Joachim"],["dc.date.accessioned","2017-09-07T11:46:42Z"],["dc.date.available","2017-09-07T11:46:42Z"],["dc.date.issued","2010"],["dc.description.abstract","The adhesion of MDCK II cells to porous and non-porous silicon substrates has been investigated by means of fluorescence and atomic force microscopy. The MDCK II cell density and the average height of the cells were increased on porous silicon substrates with regular 1.2 mu m pores as compared to flat, non-porous surfaces. In addition, we found a substantially reduced actin cytoskeleton within confluent cells cultured on the macroporous substrate compared to flat surfaces. The perturbation of the cytoskeleton relates to a significantly reduced expression of integrins on the porous area. The loss of stress fibers and cortical actin is accompanied by a dramatically reduced Young's modulus of 0.15 kPa compared to 6 kPa on flat surfaces as revealed by site-specific force-indentation experiments. (C) Koninklijke Brill NV, Leiden, 2010"],["dc.identifier.doi","10.1163/016942410X508028"],["dc.identifier.gro","3142996"],["dc.identifier.isi","000284152300013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/462"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","0169-4243"],["dc.title","Cell Adhesion to Ordered Pores: Consequences for Cellular Elasticity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","European Biophysics Journal"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Oelkers, Marieelen"],["dc.contributor.author","Lorenz, B."],["dc.contributor.author","Kriemen, Ella"],["dc.contributor.author","Werz, Daniel B."],["dc.contributor.author","Janshoff, Andreas"],["dc.date.accessioned","2018-11-07T09:22:34Z"],["dc.date.available","2018-11-07T09:22:34Z"],["dc.date.issued","2013"],["dc.format.extent","S50"],["dc.identifier.isi","000330215300061"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29373"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","New york"],["dc.relation.eventlocation","Lisbon, PORTUGAL"],["dc.relation.issn","1432-1017"],["dc.relation.issn","0175-7571"],["dc.title","Measurement of weak interactions between adhesion molecules by means of colloidal probe microscopy"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","832"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Small"],["dc.bibliographiccitation.lastpage","838"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Lorenz, Bärbel"],["dc.contributor.author","Mey, Ingo"],["dc.contributor.author","Steltenkamp, Siegfried"],["dc.contributor.author","Fine, Tamir"],["dc.contributor.author","Rommel, Christina"],["dc.contributor.author","Müller, Martin Michael"],["dc.contributor.author","Maiwald, Alexander"],["dc.contributor.author","Wegener, Joachim"],["dc.contributor.author","Steinem, Claudia"],["dc.contributor.author","Janshoff, Andreas"],["dc.date.accessioned","2017-09-07T11:47:29Z"],["dc.date.available","2017-09-07T11:47:29Z"],["dc.date.issued","2009"],["dc.description.abstract","The mechanics of cellular membranes are governed by a non-equilibrium composite framework consisting of the semiflexible filamentous cytoskeleton and extracellular matrix proteins linked to the lipid bilayer. While elasticity information of plasma membranes has mainly been obtained from whole cell analysis, techniques that allow addressing local mechanical properties of cell membranes are desirable to learn how their lipid and protein composition is reflected in the elastic behavior on local length scales. Introduced here is an approach based on basolateral membranes of polar epithelial Madin-Darby canine kidney (MDCK) H cells, prepared on a highly ordered porous substrate that allows elastic mapping on a submicrometer-length scale. A strong correlation between the density of actin filaments and the measured membrane elasticity is found. Spatially resolved indentation experiments carried out with atomic force and fluorescence microscope permit relation of the supramolecular structure to the elasticity of cellular membranes. It is shown that the elastic response of the pore spanning cell membranes is governed by local bending modules rather than lateral tension."],["dc.identifier.doi","10.1002/smll.200800930"],["dc.identifier.gro","3143128"],["dc.identifier.isi","000265171600011"],["dc.identifier.pmid","19242949"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/608"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10 / Funder: DFG"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1613-6810"],["dc.title","Elasticity Mapping of Pore-Suspending Native Cell Membranes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","818"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Der Ophthalmologe"],["dc.bibliographiccitation.lastpage","827"],["dc.bibliographiccitation.volume","114"],["dc.contributor.author","Fang, P. P."],["dc.contributor.author","Schnetzer, A."],["dc.contributor.author","Kupitz, D. G."],["dc.contributor.author","Göbel, A. P."],["dc.contributor.author","Kohnen, T."],["dc.contributor.author","Reinhard, T."],["dc.contributor.author","Lorenz, B."],["dc.contributor.author","Hoerauf, H."],["dc.contributor.author","Wagenfeld, L."],["dc.contributor.author","Auffarth, G."],["dc.contributor.author","Schaub, F."],["dc.contributor.author","Thieme, H."],["dc.contributor.author","von Livonius, B."],["dc.contributor.author","Alten, F."],["dc.contributor.author","Robering, A."],["dc.contributor.author","Brandl, C."],["dc.contributor.author","Ziemssen, F."],["dc.contributor.author","Krummenauer, F."],["dc.contributor.author","Holz, F. G."],["dc.contributor.author","Finger, R. P."],["dc.date.accessioned","2020-12-10T14:10:15Z"],["dc.date.available","2020-12-10T14:10:15Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s00347-017-0557-0"],["dc.identifier.eissn","1433-0423"],["dc.identifier.issn","0941-293X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70698"],["dc.language.iso","de"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Ophthalmologische Versorgung in Seniorenheimen"],["dc.title.alternative","Ophthalmological health care of the institutionalized elderly. The OVIS study"],["dc.title.subtitle","Die OVIS-Studie"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]