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  • 1
    Publication Date: 2015-05-09
    Description: Author(s): S. N. P. Wissing, K. T. Ritter, P. Krüger, A. B. Schmidt, and M. Donath An interband hybridization gap with spin-dependent size was detected in a low-dimensional electron system influenced by strong spin-orbit coupling. Energy gaps between hybridizing states are distinctly influenced by strong spin-orbit coupling. If the size of these gaps depends on the spin direction ... [Phys. Rev. B 91, 201403] Published Fri May 08, 2015
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
    Publication Date: 2016-01-21
    Description: The controlled formation of filamentous protein complexes plays a crucial role in many biological systems and represents an emerging paradigm in signal transduction. The mitochondrial antiviral signaling protein (MAVS) is a central signal transduction hub in innate immunity that is activated by a receptor-induced conversion into helical superstructures (filaments) assembled...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 3
    Publication Date: 2011-05-27
    Description: Recent advances in catalysis have made the incorporation of fluorine into complex organic molecules easier than ever before, but selective, general and practical fluorination reactions remain sought after. Fluorination of molecules often imparts desirable properties, such as metabolic and thermal stability, and fluorinated molecules are therefore frequently used as pharmaceuticals or materials. But the formation of carbon-fluorine bonds in complex molecules is a significant challenge. Here we discuss reactions to make organofluorides that have emerged within the past few years and which exemplify how to overcome some of the intricate challenges associated with fluorination.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119199/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119199/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Furuya, Takeru -- Kamlet, Adam S -- Ritter, Tobias -- GM088237/GM/NIGMS NIH HHS/ -- R01 GM088237/GM/NIGMS NIH HHS/ -- R01 GM088237-01A1/GM/NIGMS NIH HHS/ -- England -- Nature. 2011 May 26;473(7348):470-7. doi: 10.1038/nature10108.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21614074" target="_blank"〉PubMed〈/a〉
    Keywords: Argon/chemistry ; Carbon/chemistry ; Catalysis ; Fluorine/*chemistry ; *Halogenation ; *Methylation
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
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    Nature Publishing Group (NPG)
    Publication Date: 2010-07-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ritter, Tobias -- England -- Nature. 2010 Jul 22;466(7305):447-8. doi: 10.1038/466447a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20651680" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2011-11-05
    Description: The unnatural isotope fluorine-18 ((18)F) is used as a positron emitter in molecular imaging. Currently, many potentially useful (18)F-labeled probe molecules are inaccessible for imaging because no fluorination chemistry is available to make them. The 110-minute half-life of (18)F requires rapid syntheses for which [(18)F]fluoride is the preferred source of fluorine because of its practical access and suitable isotope enrichment. However, conventional [(18)F]fluoride chemistry has been limited to nucleophilic fluorination reactions. We report the development of a palladium-based electrophilic fluorination reagent derived from fluoride and its application to the synthesis of aromatic (18)F-labeled molecules via late-stage fluorination. Late-stage fluorination enables the synthesis of conventionally unavailable positron emission tomography (PET) tracers for anticipated applications in pharmaceutical development as well as preclinical and clinical PET imaging.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3229297/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3229297/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Eunsung -- Kamlet, Adam S -- Powers, David C -- Neumann, Constanze N -- Boursalian, Gregory B -- Furuya, Takeru -- Choi, Daniel C -- Hooker, Jacob M -- Ritter, Tobias -- 1S10RR017208-01A1/RR/NCRR NIH HHS/ -- 5P30DA028800-02/DA/NIDA NIH HHS/ -- EB013042/EB/NIBIB NIH HHS/ -- GM088237/GM/NIGMS NIH HHS/ -- R01 EB013042/EB/NIBIB NIH HHS/ -- R01 EB013042-01/EB/NIBIB NIH HHS/ -- R01 GM088237/GM/NIGMS NIH HHS/ -- R01 GM088237-03/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2011 Nov 4;334(6056):639-42. doi: 10.1126/science.1212625.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22053044" target="_blank"〉PubMed〈/a〉
    Keywords: Fluorides/chemistry ; *Fluorine Radioisotopes/chemistry ; *Halogenation ; Indicators and Reagents ; Organometallic Compounds/chemical synthesis/chemistry ; Palladium/chemistry ; Positron-Emission Tomography/*methods
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2013-12-07
    Description: The centrosome is essential for cytotoxic T lymphocyte (CTL) function, contacting the plasma membrane and directing cytotoxic granules for secretion at the immunological synapse. Centrosome docking at the plasma membrane also occurs during cilia formation. The primary cilium, formed in nonhematopoietic cells, is essential for vertebrate Hedgehog (Hh) signaling. Lymphocytes do not form primary cilia, but we found and describe here that Hh signaling played an important role in CTL killing. T cell receptor activation, which "prearms" CTLs with cytotoxic granules, also initiated Hh signaling. Hh pathway activation occurred intracellularly and triggered Rac1 synthesis. These events "prearmed" CTLs for action by promoting the actin remodeling required for centrosome polarization and granule release. Thus, Hh signaling plays a role in CTL function, and the immunological synapse may represent a modified cilium.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4022134/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4022134/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de la Roche, Maike -- Ritter, Alex T -- Angus, Karen L -- Dinsmore, Colin -- Earnshaw, Charles H -- Reiter, Jeremy F -- Griffiths, Gillian M -- 075880/Wellcome Trust/United Kingdom -- 100140/Wellcome Trust/United Kingdom -- R01 AR054396/AR/NIAMS NIH HHS/ -- R01 GM095941/GM/NIGMS NIH HHS/ -- R01AR05439/AR/NIAMS NIH HHS/ -- R01GM095941/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2013 Dec 6;342(6163):1247-50. doi: 10.1126/science.1244689.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cambridge Institute for Medical Research, University of Cambridge, Hills Road, Cambridge CB2 0XY, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24311692" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; CD8-Positive T-Lymphocytes/*immunology/metabolism ; Cell Polarity ; Cells, Cultured ; Centrosome/metabolism ; *Cytotoxicity, Immunologic ; Hedgehog Proteins/*metabolism ; *Immunological Synapses ; Kruppel-Like Transcription Factors/genetics/metabolism ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Mice, Transgenic ; Models, Immunological ; Neuropeptides/genetics/metabolism ; Receptors, Antigen, T-Cell/immunology/metabolism ; Receptors, Cell Surface/metabolism ; Receptors, G-Protein-Coupled/metabolism ; *Signal Transduction ; T-Lymphocytes, Cytotoxic/*immunology/metabolism ; rac1 GTP-Binding Protein/genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2014-10-25
    Description: Although fluorescence microscopy provides a crucial window into the physiology of living specimens, many biological processes are too fragile, are too small, or occur too rapidly to see clearly with existing tools. We crafted ultrathin light sheets from two-dimensional optical lattices that allowed us to image three-dimensional (3D) dynamics for hundreds of volumes, often at subsecond intervals, at the diffraction limit and beyond. We applied this to systems spanning four orders of magnitude in space and time, including the diffusion of single transcription factor molecules in stem cell spheroids, the dynamic instability of mitotic microtubules, the immunological synapse, neutrophil motility in a 3D matrix, and embryogenesis in Caenorhabditis elegans and Drosophila melanogaster. The results provide a visceral reminder of the beauty and the complexity of living systems.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4336192/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4336192/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Bi-Chang -- Legant, Wesley R -- Wang, Kai -- Shao, Lin -- Milkie, Daniel E -- Davidson, Michael W -- Janetopoulos, Chris -- Wu, Xufeng S -- Hammer, John A 3rd -- Liu, Zhe -- English, Brian P -- Mimori-Kiyosue, Yuko -- Romero, Daniel P -- Ritter, Alex T -- Lippincott-Schwartz, Jennifer -- Fritz-Laylin, Lillian -- Mullins, R Dyche -- Mitchell, Diana M -- Bembenek, Joshua N -- Reymann, Anne-Cecile -- Bohme, Ralph -- Grill, Stephan W -- Wang, Jennifer T -- Seydoux, Geraldine -- Tulu, U Serdar -- Kiehart, Daniel P -- Betzig, Eric -- GM33830/GM/NIGMS NIH HHS/ -- R01 GM033830/GM/NIGMS NIH HHS/ -- R01GM080370/GM/NIGMS NIH HHS/ -- R01HD37047/HD/NICHD NIH HHS/ -- RM01-GM61010/GM/NIGMS NIH HHS/ -- T32 GM007445/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2014 Oct 24;346(6208):1257998. doi: 10.1126/science.1257998. Epub 2014 Oct 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA. ; Coleman Technologies, Incorporated, Newtown Square, PA 19073, USA. ; National High Magnetic Field Laboratory and Department of Biological Science, Florida State University, Tallahassee, FL 32310, USA. ; Department of Biological Sciences, University of the Sciences, Philadelphia, PA 19104, USA. ; Laboratory of Cell Biology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA. ; Optical Image Analysis Unit, RIKEN Center for Developmental Biology, Kobe 650-0047, Japan. ; Department of Pharmacology, University of Minnesota, Minneapolis, MN 55455, USA. ; Cell Biology and Metabolism Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA. Cambridge Institute for Medical Research, Addenbrooke's Hospital, Cambridge CB2 0XY, England, UK. ; Cell Biology and Metabolism Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA. ; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA. ; Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA. ; Max Planck Institute for Molecular Cell Biology and Genetics, 01307 Dresden, Germany. Max Planck Institute for the Physics of Complex Systems, 01307 Dresden, Germany. ; Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Center for Cell Dynamics, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA. ; Department of Biology, Duke University, Durham, NC 27708, USA. ; Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA. betzige@janelia.hhmi.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25342811" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/*embryology ; Cell Communication ; Drosophila melanogaster/*embryology ; Embryo, Nonmammalian/*ultrastructure ; Embryonic Stem Cells/ultrastructure ; Imaging, Three-Dimensional/*methods ; Mice ; Microscopy/*methods ; Molecular Imaging/*methods ; Spheroids, Cellular/ultrastructure
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2017-08-09
    Description: CD8+ cytotoxic T lymphocytes (CTLs) eliminate virally infected cells through directed secretion of specialized lytic granules. Because a single CTL can kill multiple targets, degranulation must be tightly regulated. However, how CTLs regulate the termination of granule secretion remains unclear. Previous work demonstrated that centralized actin reduction at the immune...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 9
    Publication Date: 2019
    Description: 〈span〉〈div〉SUMMARY〈/div〉The occurrence of deep low-frequency (DLF) microearthquakes beneath volcanoes is commonly attributed to mass transport in the volcanic plumbing system and used to infer feeding channels from and into magma reservoirs. The key question is how magmas migrate from depth to the shallow crust and whether magma reservoirs are currently being recharged. For the first time since the improvement of the local seismic networks in the East Eifel region (Rhineland-Palatinate, Germany), we detect and locate recurrent DLF earthquakes in the lower crust and upper mantle beneath the Laacher See Volcano (LSV), using a joint data set of permanent sensors and a temporary deployment. So far, eight DLF earthquake sequences were observed in four distinct clusters between 10 km and 40 km depth. These clusters of weak events (〈span〉ML〈/span〉〈 2) align along an approximately 80° south-east dipping line south of the LSV. Moment tensor solutions of these events have large shear components, and the irregular dispersion and long coda of body waves indicate interaction processes between shear cracks and fluids. We find a rotation of P-axes orientation for shallow tectonic earthquakes compared to DLF events, indicating that the stress field in the depth interval of DLF events might favor a vertical migration of magma or magmatic fluids. The caldera of LSV was formed by the last major eruption of the East Eifel Volcanic Field only 12.9 kyr ago, fed by a shallow magma chamber at 5-8 km depth and erupting a total magma volume of 6.7 km〈sup〉3〈/sup〉. The observed DLF earthquake activity and continuous volcanic gas emissions around the LSV indicate an active magmatic system, possibly connected with an upper mantle melt zone.〈/span〉
    Print ISSN: 2051-1965
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1417-1419 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The phonon spectra of InxGa1−xAs/GaAs strained-layer superlattices grown on (100), or either one of the two inequivalent (211)A and B surfaces of GaAs were obtained by Raman scattering for pressures ranging from 1 atm to 13.0 GPa. The measurements show that phonon frequencies are discontinuous functions of pressure for (211)A superlattices in contrast to the continuous behavior observed for (100) and (211)B-oriented superlattices. These discontinuities are discussed in terms of pressure induced increase in the density of heterointerface dislocations.
    Type of Medium: Electronic Resource
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