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  • Polymer and Materials Science  (42,334)
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Collection
Keywords
Publisher
Language
Years
Year
  • 1
    Unknown
    Mathematical and conceptual foundations of 20th-century physics (1984)
    Amsterdam ; New York : North-Holland Pub. Co
    Details
    Keywords: DDC 530.1 ; LC QC20 ; Mathematical physics ; Physics ; Quantum theory ; Relativity (Physics)
    ISBN: 9780444875853
    URL: http://www.sciencedirect.com/science/publication?issn=03040208&volume=100
    Language: English
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  • 2
    Unknown
    Advances in Discrete Differential Geometry (2016)
    Berlin, Heidelberg : Springer
    Details
    Keywords: Mathematics ; Computer graphics ; Dynamics ; Ergodic theory ; Functions of complex variables ; Differential geometry ; Physics ; Mathematics ; Differential Geometry ; Functions of a Complex Variable ; Dynamical Systems and Ergodic Theory ; Computer Graphics ; Numerical and Computational Physics
    Description / Table of Contents: Discrete conformal maps: Boundary value problems, circle domains, Fuchsian and Schottky uniformization: Alexander I. Bobenko, Stefan Sechelmann, Boris Springborn --- Discrete complex analysis on planar quad-graphs: Alexander I. Bobenko and Felix Günther --- Approximation of conformal mappings using conformally equivalent triangular lattices: Ulrike Bücking --- Numerical Methods for the Discrete Map Za: Folkmar Bornemann, Alexander Its, Sheehan Olver, and Georg Wechslberger --- A variational principle for cyclic polygons with prescribed edge lengths: Hana Kourimská, Lara Skuppin, Boris Springborn --- Complex Line Bundles over Simplicial Complexes and their Applications: Felix Knöppel and Ulrich Pinkall --- Holomorphic vector fields and quadratic differentials on planar triangular meshes: Wai Yeung Lam, Ulrich Pinkall --- Vertex normals and face curvatures of triangle meshes: Xiang Sun, Caigui Jiang, Johannes Wallner, and Helmut Pottmann --- S-conical cmc surfaces. Towards a unified theory of discrete surfaces with constant mean curvature: Alexander I. Bobenko and Tim Hoffmann --- Constructing solutions to the Björling problem for isothermic surfaces by structure preserving discretization: Ulrike Bücking and Daniel Matthes --- On the Lagrangian Structure of Integrable Hierarchies: Yuri B. Suris, Mats Vermeeren --- On the variational interpretation of the discrete KP equation: Raphael Boll, Matteo Petrera, and Yuri B. Suris --- Six topics on inscribable polytopes: Arnau Padrol and Günter M. Ziegler --- DGD Gallery: Storage, sharing, and publication of digital research data: Michael Joswig, Milan Mehner, Stefan Sechelmann, Jan Techter, and Alexander I. Bobenko
    Pages: Online-Ressource (X, 439 pages) , 114 illustrations, 67 illustrations in color
    ISBN: 9783662504475
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-662-50447-5
    Language: English
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  • 3
    Unknown
    The Cellular Automaton Interpretation of Quantum Mechanics (2016)
    Cham : Springer
    Details
    Keywords: Physics ; Mathematical physics ; Quantum physics ; Physics ; Quantum Physics ; Mathematical Applications in the Physical Sciences ; History and Philosophical Foundations of Physics
    Description / Table of Contents: I The Cellular Automaton Interpretation as a general doctrine: Motivation for this work --- Deterministic models in quantum notation --- Interpreting quantum mechanics --- Deterministic quantum mechanics --- Concise description of the CA Interpretation --- Quantum gravity --- Information loss --- More problems --- Alleys to be further investigated and open questions --- Conclusions --- II Calculation Techniques: Introduction to part II --- More on cogwheels --- The continuum limit of cogwheels, harmonic rotators and oscillators --- Locality --- Fermions --- PQ theory --- Models in two space-time dimensions without interactions --- Symmetries --- The discretised Hamiltonian formalism in PQ theory --- Quantum Field Theory --- The cellular automaton --- The problem of quantum locality --- Conclusions of part II --- Some remarks on gravity in 2+1 dimensions --- A summary of our views on Conformal Gravity --- Abbreviations.
    Pages: Online-Ressource (XVIII, 298 pages) , 21 illustrations, 19 illustrations in color
    ISBN: 9783319412856
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-41285-6
    Language: English
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  • 4
    Unknown
    Non-Equilibrium Social Science and Policy : Introduction and Essays on New and Changing Paradigms in Socio-Economic Thinking (2017)
    Cham : Springer
    Details
    Keywords: Physics ; Complexity, Computational ; Economic theory ; Social sciences ; Physics ; Data-driven Science, Modeling and Theory Building ; Methodology of the Social Sciences ; Economic Theory/Quantitative Economics/Mathematical Methods ; Operations Research/Decision Theory ; Complexity ; Computational Social Sciences
    Description / Table of Contents: Non-Equilibrium Social Science & Policy --- Economics --- Social Psychology and Narrative Economy --- Sociology and Non-Equilibrium Social Science --- Geography far from Equilibrium --- Cities in Disequilibrium --- The Evolutionary Theory of Globalization --- Systems, Networks, and Policy --- Towards a Complexity-Friendly Policy: breaking the vicious circle of equilibrium thinking in economic and public policy --- The Information Economy --- Complexity Science & the Art of Policy Making --- The Complexity of Government --- The Room Around the Elephant: Tackling Context-Dependency in the Social Sciences --- Global Systems Science and Policy --- Index.
    Pages: Online-Ressource (VIII, 232 pages)
    ISBN: 9783319424248
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-42424-8
    Language: English
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  • 5
    Unknown
    Melting Hadrons, Boiling Quarks - From Hagedorn Temperature to Ultra-Relativistic Heavy-Ion Collisions at CERN : With a Tribute to Rolf Hagedorn (2016)
    Cham : Springer
    Details
    Keywords: Physics ; History ; Nuclear physics ; Heavy ions ; Hadrons ; Particle acceleration ; Physics ; Nuclear Physics, Heavy Ions, Hadrons ; History and Philosophical Foundations of Physics ; Particle Acceleration and Detection, Beam Physics ; History of Science
    Description / Table of Contents: Part I Reminiscences: Rolf Hagedorn and Relativistic Heavy Ion Research.-- Part II The Hagedorn Temperature --- Part III Melting Hadrons, Boiling Quarks Heavy Ion Path to Quark-Gluon Plasma --- Acronyms
    Pages: Online-Ressource (XVI, 441 pages)
    ISBN: 9783319175454
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-17545-4
    Language: English
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  • 6
    Unknown
    Foundations of Quantum Theory : From Classical Concepts to Operator Algebras (2017)
    Cham : Springer
    Details
    Keywords: Physics ; Matrix theory ; Algebra ; Mathematical physics ; Quantum physics ; Physics ; Quantum Physics ; Mathematical Physics ; History and Philosophical Foundations of Physics ; Linear and Multilinear Algebras, Matrix Theory
    Description / Table of Contents: Introduction --- Part I Co(X) and B(H): Classical physics on a finite phase space --- Quantum mechanics on a finite-dimensional Hilbert space --- Classical physics on a general phase space --- Quantum physics on a general Hilbert space --- Symmetry in quantum mechanics --- Part II Between Co(X) and B(H): Classical models of quantum mechanics --- Limits: Small hbar --- Limits: large N --- Symmetry in algebraic quantum theory --- Spontaneous Symmetry Breaking --- The Measurement Problem --- Topos theory and quantum logic --- Appendix A: Finite-dimensional Hilbert spaces --- Appendix B: Basic functional analysis --- Appendix C: Operator algebras --- Appendix D: Lattices and logic --- Appendix E: Category theory and topos theory --- References
    Pages: Online-Ressource (XXXVI, 861 pages) , 9 illustrations, 8 illustrations in color
    ISBN: 9783319517773
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-51777-3
    Language: English
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  • 7
    Unknown
    Counteracting Urban Heat Island Effects in a Global Climate Change Scenario (2016)
    Cham : Springer
    Details
    Keywords: Environment ; Climate change ; Remote sensing ; Physics ; Environment ; Climate Change ; Remote Sensing/Photogrammetry ; Energy Efficiency ; Climate Change/Climate Change Impacts ; Applied and Technical Physics
    Description / Table of Contents: Part I The Urban Heat Island – Evidence, Measures and Tools --- Forecasting Models for Urban Warming in Climate Change --- Assessment Indication and Gold Standard --- Methodologies for UHI Analysis --- Decision Support Systems for Urban Planning --- Part II Pilot Actions in European Cities --- Counteracting Urban Heat Islands: Solutions for European Cities.
    Pages: Online-Ressource (LIII, 400 pages) , 213 illustrations
    ISBN: 9783319104256
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-10425-6
    Language: English
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  • 8
    Unknown
    Physical (A)Causality : Determinism, Randomness and Uncaused Events (2018)
    Cham : Springer
    Details
    Keywords: Physics ; Epistemology ; Philosophy and science ; Probabilities ; Physics ; History and Philosophical Foundations of Physics ; Theoretical, Mathematical and Computational Physics ; Epistemology ; Probability Theory and Stochastic Processes ; Philosophy of Science
    Description / Table of Contents: Part I Embedded observers, reflexive perception and representation: Intrinsic and extrinsic observation mode --- Embedded observers and self-expression --- Reflexive measurement --- Intrinsic self-representation --- Part II Provable unknowns: On what is entirely hopeless --- Forecasting and unpredictability --- Induction by rule inference --- Other types of recursion theoretic unknowables --- What if there are no laws? Emergence of laws --- Part III Quantum unknowns: "Shut up and calculate" --- Evolution by permutation --- Quantum mechanics in a nutshell --- Quantum oracles --- Vacuum fluctuations --- Radioactive decay --- Part IV Exotic unknowns: Classical continua and infinities --- Classical (in)determinism --- Deterministic chaos --- Partition logics, finite automata and generalized urn models --- Part V Transcendence: Miracles --- Dualistic interfaces --- Part VI Executive summary: Executive summary --- Appendix A: Formal (in)computability and randomness --- B: Two particle correlations and expectations
    Pages: Online-Ressource (XIV, 219 pages) , 32 illustrations, 24 illustrations in color
    ISBN: 9783319708157
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-70815-7
    Language: English
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  • 9
    Unknown
    The Cellular Automaton Interpretation of Quantum Mechanics (2016)
    Cham : Springer
    Details
    Keywords: Physics ; Mathematical physics ; Quantum physics ; Physics ; Quantum Physics ; Mathematical Applications in the Physical Sciences ; History and Philosophical Foundations of Physics
    Description / Table of Contents: I The Cellular Automaton Interpretation as a general doctrine: Motivation for this work --- Deterministic models in quantum notation --- Interpreting quantum mechanics --- Deterministic quantum mechanics --- Concise description of the CA Interpretation --- Quantum gravity --- Information loss --- More problems --- Alleys to be further investigated and open questions --- Conclusions --- II Calculation Techniques: Introduction to part II --- More on cogwheels --- The continuum limit of cogwheels, harmonic rotators and oscillators --- Locality --- Fermions --- PQ theory --- Models in two space-time dimensions without interactions --- Symmetries --- The discretised Hamiltonian formalism in PQ theory --- Quantum Field Theory --- The cellular automaton --- The problem of quantum locality --- Conclusions of part II --- Some remarks on gravity in 2+1 dimensions --- A summary of our views on Conformal Gravity --- Abbreviations.
    Pages: Online-Ressource (XVIII, 298 pages) , 21 illustrations, 19 illustrations in color
    ISBN: 9783319412856
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-41285-6
    Language: English
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  • 10
    Unknown
    Melting Hadrons, Boiling Quarks - From Hagedorn Temperature to Ultra-Relativistic Heavy-Ion Collisions at CERN : With a Tribute to Rolf Hagedorn (2016)
    Cham : Springer
    Details
    Keywords: Physics ; History ; Nuclear physics ; Heavy ions ; Hadrons ; Particle acceleration ; Physics ; Nuclear Physics, Heavy Ions, Hadrons ; History and Philosophical Foundations of Physics ; Particle Acceleration and Detection, Beam Physics ; History of Science
    Description / Table of Contents: Part I Reminiscences: Rolf Hagedorn and Relativistic Heavy Ion Research.-- Part II The Hagedorn Temperature --- Part III Melting Hadrons, Boiling Quarks Heavy Ion Path to Quark-Gluon Plasma --- Acronyms
    Pages: Online-Ressource (XVI, 441 pages)
    ISBN: 9783319175454
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-17545-4
    Language: English
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  • 11
    Unknown
    Collider Physics within the Standard Model : A Primer (2017)
    Cham : Springer
    Details
    Keywords: Physics ; Quantum field theory ; String theory ; Elementary particles (Physics) ; Physics ; Elementary Particles, Quantum Field Theory ; Quantum Field Theories, String Theory
    Description / Table of Contents: Preface --- Gauge Theories and the Standard Model --- QCD: The Theory of Strong Interactions --- The Theory of Electroweak Interactions --- References
    Pages: Online-Ressource (XIV, 173 pages) , 60 illustrations, 34 illustrations in color
    ISBN: 9783319519203
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-51920-3
    Language: English
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  • 12
    Unknown
    Optics in Our Time (2016)
    Cham : Springer
    Details
    Keywords: Physics ; Quantum optics ; Physics ; Optics, Lasers, Photonics, Optical Devices ; Quantum Optics ; Popular Science in Physics ; History and Philosophical Foundations of Physics
    Description / Table of Contents: History --- A brief history of light --- Ibn Al-Haitham – Father of modern optics --- Optical Sources --- Femtosecond light --- Laser --- LED light --- Electron optics --- Applications --- Biophotonics --- Optical communication --- Optical astronomy --- Solar cells --- Optics in Remote Sensing --- Optics in nanotechnology --- Optics in art --- Eye --- Optics in medicine --- Optical illusions --- Quantum Optics --- Optical tests of foundations of physics --- Nonlinear Optics: Historical Perspectives and New Opportunities --- Quantum communication --- Nature of photon --- Atom optics --- Coherent effects: From EIT to slow light
    Pages: Online-Ressource (XX, 504 pages) , 355 illustrations, 277 illustrations in color
    ISBN: 9783319319032
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-31903-2
    Language: English
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  • 13
    Unknown
    Non-Equilibrium Social Science and Policy : Introduction and Essays on New and Changing Paradigms in Socio-Economic Thinking (2017)
    Cham : Springer
    Details
    Keywords: Physics ; Complexity, Computational ; Economic theory ; Social sciences ; Physics ; Data-driven Science, Modeling and Theory Building ; Methodology of the Social Sciences ; Economic Theory/Quantitative Economics/Mathematical Methods ; Operations Research/Decision Theory ; Complexity ; Computational Social Sciences
    Description / Table of Contents: Non-Equilibrium Social Science & Policy --- Economics --- Social Psychology and Narrative Economy --- Sociology and Non-Equilibrium Social Science --- Geography far from Equilibrium --- Cities in Disequilibrium --- The Evolutionary Theory of Globalization --- Systems, Networks, and Policy --- Towards a Complexity-Friendly Policy: breaking the vicious circle of equilibrium thinking in economic and public policy --- The Information Economy --- Complexity Science & the Art of Policy Making --- The Complexity of Government --- The Room Around the Elephant: Tackling Context-Dependency in the Social Sciences --- Global Systems Science and Policy --- Index.
    Pages: Online-Ressource (VIII, 232 pages)
    ISBN: 9783319424248
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-42424-8
    Language: English
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  • 14
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    International Cooperation for Enhancing Nuclear Safety, Security, Safeguards and Non-proliferation–60 Years of IAEA and EURATOM : Proceedings of the XX Edoardo Amaldi Conference, Accademia Nazionale dei Lincei, Rome, Italy, October 9-10, 2017 (2018)
    Berlin, Heidelberg : Springer
    Details
    Keywords: Physics ; Nuclear energy ; International relations ; Physics ; Applied and Technical Physics ; Societal Aspects of Physics, Outreach and Education ; Nuclear Energy ; International Relations
    Description / Table of Contents: This open access book examines key aspects of international cooperation to enhance nuclear safety, security, safeguards, and non-proliferation, thereby assisting in development and maintenance of the verification regime and fostering progress toward a nuclear weapon-free world. The book opens by addressing important political, institutional, and legal dimensions. Current challenges are discussed and attempts made to identify possible solutions and future improvements. Subsequent sections consider scientific developments that have the potential to increase the effectiveness of implementation of international regimes, particularly in critical areas, technology foresight, and the ongoing evaluation of current capabilities. The closing sections examine scientific and technical challenges and discuss the role of international cooperation and actions of the scientific community in leading the world toward peace and security. The book – which celebrates 60 years of IAEA Atoms for Peace and Development and the EURATOM Treaty – comprises contributions presented at the XX Edoardo Amaldi Conference, where eminent scientists, diplomats, and policymakers were able to compare national perspectives and update international collaborations
    Pages: Online-Ressource (XXXVI, 220 pages) , 16 illustrations in color
    ISBN: 9783662573662
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-662-57366-2
    Language: English
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  • 15
    Unknown
    Counteracting Urban Heat Island Effects in a Global Climate Change Scenario (2016)
    Cham : Springer
    Details
    Keywords: Environment ; Climate change ; Remote sensing ; Physics ; Environment ; Climate Change ; Remote Sensing/Photogrammetry ; Energy Efficiency ; Climate Change/Climate Change Impacts ; Applied and Technical Physics
    Description / Table of Contents: Part I The Urban Heat Island – Evidence, Measures and Tools --- Forecasting Models for Urban Warming in Climate Change --- Assessment Indication and Gold Standard --- Methodologies for UHI Analysis --- Decision Support Systems for Urban Planning --- Part II Pilot Actions in European Cities --- Counteracting Urban Heat Islands: Solutions for European Cities.
    Pages: Online-Ressource (LIII, 400 pages) , 213 illustrations
    ISBN: 9783319104256
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-319-10425-6
    Language: English
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  • 16
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    Advances in Discrete Differential Geometry (2016)
    Berlin, Heidelberg : Springer
    Details
    Keywords: Mathematics ; Computer graphics ; Dynamics ; Ergodic theory ; Functions of complex variables ; Differential geometry ; Physics ; Mathematics ; Differential Geometry ; Functions of a Complex Variable ; Dynamical Systems and Ergodic Theory ; Computer Graphics ; Numerical and Computational Physics
    Description / Table of Contents: Discrete conformal maps: Boundary value problems, circle domains, Fuchsian and Schottky uniformization: Alexander I. Bobenko, Stefan Sechelmann, Boris Springborn --- Discrete complex analysis on planar quad-graphs: Alexander I. Bobenko and Felix Günther --- Approximation of conformal mappings using conformally equivalent triangular lattices: Ulrike Bücking --- Numerical Methods for the Discrete Map Za: Folkmar Bornemann, Alexander Its, Sheehan Olver, and Georg Wechslberger --- A variational principle for cyclic polygons with prescribed edge lengths: Hana Kourimská, Lara Skuppin, Boris Springborn --- Complex Line Bundles over Simplicial Complexes and their Applications: Felix Knöppel and Ulrich Pinkall --- Holomorphic vector fields and quadratic differentials on planar triangular meshes: Wai Yeung Lam, Ulrich Pinkall --- Vertex normals and face curvatures of triangle meshes: Xiang Sun, Caigui Jiang, Johannes Wallner, and Helmut Pottmann --- S-conical cmc surfaces. Towards a unified theory of discrete surfaces with constant mean curvature: Alexander I. Bobenko and Tim Hoffmann --- Constructing solutions to the Björling problem for isothermic surfaces by structure preserving discretization: Ulrike Bücking and Daniel Matthes --- On the Lagrangian Structure of Integrable Hierarchies: Yuri B. Suris, Mats Vermeeren --- On the variational interpretation of the discrete KP equation: Raphael Boll, Matteo Petrera, and Yuri B. Suris --- Six topics on inscribable polytopes: Arnau Padrol and Günter M. Ziegler --- DGD Gallery: Storage, sharing, and publication of digital research data: Michael Joswig, Milan Mehner, Stefan Sechelmann, Jan Techter, and Alexander I. Bobenko
    Pages: Online-Ressource (X, 439 pages) , 114 illustrations, 67 illustrations in color
    ISBN: 9783662504475
    URL: https://link.springer.com/openurl?genre=book&isbn=978-3-662-50447-5
    Language: English
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  • 17
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    Niphargus-Thiothrix associations may be widespread in sulphidic groundwater ecosystems: evidence from southeastern Romania. (2018)
    Details
    Publication Date: 2021-04-25
    Description: Niphargus is a speciose amphipod genus found in groundwater habitats across Europe. Three Niphargus species living in the sulphidic Frasassi caves in Italy harbour sulphur-oxidizing Thiothrix bacterial ectosymbionts. These three species are distantly related, implying that the ability to form ectosymbioses with Thiothrix may be common among Niphargus. Therefore, Niphargus-Thiothrix associations may also be found in sulphidic aquifers other than Frasassi. In this study, we examined this possibility by analysing niphargids of the genera Niphargus and Pontoniphargus collected from the partly sulphidic aquifers of the Southern Dobrogea region of Romania, which are accessible through springs, wells and Movile Cave. Molecular and morphological analyses revealed seven niphargid species in this region. Five of these species occurred occasionally or exclusively in sulphidic locations, whereas the remaining two were restricted to nonsulphidic areas. Thiothrix were detected by PCR on all seven Dobrogean niphargid species and observed using microscopy to be predominantly attached to their hosts' appendages. 16S rRNA gene sequences of the Thiothrix epibionts fell into two main clades, one of which (herein named T4) occurred solely on niphargids collected in sulphidic locations. The other Thiothrix clade was present on niphargids from both sulphidic and nonsulphidic areas and indistinguishable from the T3 ectosymbiont clade previously identified on Frasassi-dwelling Niphargus. Although niphargids from Frasassi and Southern Dobrogea are not closely related, the patterns of their association with Thiothrix are remarkably alike. The finding of similar Niphargus-Thiothrix associations in aquifers located 1200 km apart suggests that they may be widespread in European groundwater ecosystems.
    Keywords: amphipods; ecology; sulphide; symbiosis; systematics; taxonomy ; 551 ; Amphipoda ; Animals ; DNA, Bacterial ; Ecosystem ; Groundwater ; Molecular Sequence Data ; Phylogeny ; RNA, Ribosomal, 16S ; Romania ; Sequence Analysis, DNA ; Sulfur ; Symbiosis ; Thiothrix
    Language: English , English
    Type: article , publishedVersion
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  • 18
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    [In Depth] Long-delayed nuclear center looks set for construction (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-08
    Description: After many years of delays, the €1.7 billion Facility for Antiproton and Ion Research, an extension of the GSI Helmholtz Center for Heavy Ion Research near Darmstadt, Germany, may finally get built. At a council meeting on 27 and 28 June, the partner countries—eight European Union members plus India and Russia—concluded that they have enough money to cover a €320 million budget gap; they will now seek building permits from the German government. Still, some countries have yet to commit their share of the missing cash, including Russia, which had agreed to bear about 18% of FAIR's total construction cost, the second largest contribution after Germany's 70%. Author: Edwin Cartlidge
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 19
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    [Editors' Choice] Carboxylating stubborn alkyl chlorides (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-08
    Description: Author: Phil Szuromi
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 20
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    [This Week in Science] Olefins enlisted to attack ketones (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-08
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 21
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    [This Week in Science] A radical route to ophiobolin rings (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-05-27
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 22
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    [Editors' Choice] Watching phonons propagate (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-05-27
    Description: Author: Jelena Stajic
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 23
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    [This Week in Science] A light approach to C-N bond formation (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-15
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 24
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    [Editors' Choice] Shaping the interaction potential (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-15
    Description: Author: Jelena Stajic
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 25
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    [This Week in Science] Imaging electromagnetic waveforms (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-22
    Description: Author: Ian S. Osborne
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 26
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    [Editors' Choice] Iron takes alcohols to carboxylic acids (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2016-07-22
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    [Editors' Choice] Making sense of transport in WSe2 (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-04-08
    Description: Author: Jelena Stajic
    Keywords: Physics
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    [Perspective] A benchmark for materials simulation (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2016-03-25
    Description: Density functional theory (DFT) stands out from all first-principles quantum mechanical methods for the simulation of materials, as it enables very good approximations for the complicated components of electronic motion called exchange and correlation. DFT is the method of choice for many materials simulations because of the availability of general-purpose programs that can perform calculations on any material. Results obtained with one DFT program need to be reproducible by any of the other DFT programs, and this has not been straightforward up to now. On page 10.1126/science.aad3000 of this issue, Lejaeghere et al. (1) describe an extensive effort by developers of the major solid-state DFT codes to provide a unified and reproducible benchmark of precision for their calculations based on a reliable criterion, the so-called Δ gauge. Using the Δ gauge, the authors found that the level of precision that can be achieved today in DFT calculations of elemental crystalline solids is comparable to the precision of the most advanced techniques for experimental measurement of the properties of materials. The work leads to the conclusion that the DFT simulation of elemental crystalline solids is a (computationally) solved problem, but also poses the question of whether we can achieve the same levels of validation and reproducibility for more complex simulations of materials involving several elements and/or several methods. Author: Chris-Kriton Skylaris
    Keywords: Physics
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    [Perspective] Timing photoemission—Final state matters (2016)
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    In: Science
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    Publication Date: 2016-07-01
    Description: The photoemission of electrons from atoms, molecules, and condensed matter provides the experimental basis of our understanding of electronic structure. During the process of photoemission, a sufficiently large quantum of electromagnetic radiation (a photon) is absorbed by matter and converted into an electronic excitation, promoting a bound electron into a final state above the vacuum energy Evac. In photoemission spectroscopy, the kinetic energy and momentum of electrons in such final states are analyzed after their propagation to a distant detector. To determine the electronic structure of the sample, the “sudden approximation” has to be fulfilled, whereby the photoelectron leaves the sample fast enough, without further interaction with the remaining electronic structure. On page 62 of this issue, Tao et al. (1) provide unprecedented insight into final-state dynamics by measuring the time a photoelectron takes to leave a solid material for characteristically different final states. By comparing an electron excited to a final state of a nickel solid Ψ Nif with one excited to a state of vacuum Ψ vacf, they establish that a photoelectron resides in the final state for 200 attoseconds (as) (2 × 10−16 s) before it leaves the nickel (see the figure). Such time scales would still allow for the electron to interact with its surroundings and, thus, are relevant for the validity of the sudden approximation. Authors: Uwe Bovensiepen, Manuel Ligges
    Keywords: Physics
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    [This Week in Science] Catalysis gets all tied up in knots (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-06-24
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    [Editors' Choice] A partially protected surface state (2016)
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    Publication Date: 2016-06-24
    Description: Author: Jelena Stajic
    Keywords: Physics
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    [This Week in Science] Adding two fluorines to just one carbon (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-07-01
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    [Book Review] The supercollider that wasn't (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-08-16
    Description: When a multibillion-dollar physics experiment is canceled, it's tempting to look for lessons that can be applied to future megascience projects. A new book on the rise and fall of the Superconducting Supercollider (SSC) by a trio of science historians takes on that challenge. And while the authors do an excellent job of describing what occurred in the decade from its inception to its demise, they stumble when trying to assign blame. Author: Jeffrey Mervis
    Keywords: Physics
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    [Perspective] Three catalysts for activating carbon-hydrogen bonds (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-06-10
    Description: Transition metal–catalyzed arylation of C–H bonds has been intensively studied for forming C–C bonds in complex-molecule synthesis (1). An acidic C–H bond (for example, one near a double bond or an O atom) is cleaved to form a carbon–metal bond, which then couples to arene. Many of these organometallic species can be generated catalytically. Much less research has dealt with unreactive nonacidic sp3 C–H bond functionalization (3). On page 1304 of this issue, Shaw et al. (3) report an efficient and general method that focuses on arylation of sp3 C–H bonds at carbon atoms adjacent to amines and to cyclic ethers by combining nickel, visible-light photoredox, and hydrogen-atom transfer (HAT) catalysis. Author: Corinne Fruit
    Keywords: Organic Chemistry
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    [This Week in Science] A tip of the HAT to C-C bond formation (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-06-10
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    [This Week in Science] A rhodium route from C-H to C-N bonds (2016)
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    Publication Date: 2016-09-09
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    [This Week in Science] Copper-catalyzed radical relay (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2016-09-07
    Description: Author: Jake Yeston
    Keywords: Organic Chemistry
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    A "selfish" B chromosome that enhances its transmission by eliminating the paternal genome (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-04-22
    Description: In the parasitic wasp, Nasonia vitripennis, males are haploid and usually develop from unfertilized eggs, whereas females are diploid and develop from fertilized eggs. Some individuals in this species carry a genetic element, termed psr (paternal sex ratio), which is transmitted through sperm and causes condensation and subsequent loss of paternal chromosomes in fertilized eggs, thus converting diploid females into haploid males. In this report the psr trait was shown to be caused by a supernumerary chromosome. This B chromosome contains at least three repetitive DNA sequences that do not cross-hybridize to each other or to the host genome. The psr chromosome apparently produces a trans-acting product responsible for condensation of the paternal chromosomes, but is itself insensitive to the effect. Because the psr chromosome enhances its transmission by eliminating the rest of the genome, it can be considered the most "selfish" genetic element yet described.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nur, U -- Werren, J H -- Eickbush, D G -- Burke, W D -- Eickbush, T H -- GM31867/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 22;240(4851):512-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Rochester, NY 14627.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3358129" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Chromosomes/*physiology ; Cloning, Molecular ; DNA, Satellite ; Diploidy ; Haploidy ; Hymenoptera/*genetics ; Molecular Sequence Data ; Repetitive Sequences, Nucleic Acid ; Sex Determination Analysis ; *Sex Ratio ; Wasps/*genetics
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    Crisis in biosystematics of arthropods (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-05-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oliver, J H Jr -- New York, N.Y. -- Science. 1988 May 20;240(4855):967.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3368789" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Arthropod Vectors ; Government Agencies ; Humans ; *Research Support as Topic ; United States
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    Reduction of naturally occurring motoneuron death in vivo by a target-derived neurotrophic factor (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-05-13
    Description: Treatment of chick embryos in ovo with crude and partially purified extracts from embryonic hindlimbs (days 8 to 9) during the normal cell death period (days 5 to 10) rescues a significant number of motoneurons from degeneration. The survival activity of partially purified extract was dose-dependent and developmentally regulated. The survival of sensory, sympathetic, parasympathetic, and a population of cholinergic sympathetic preganglionic neurons was unaffected by treatment with hindlimb extract. The massive motoneuron death that occurs after early target (hindlimb) removal was partially ameliorated by daily treatment with the hindlimb extract. These results indicate that a target-derived neurotrophic factor is involved in the regulation of motoneuron survival in vivo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppenheim, R W -- Haverkamp, L J -- Prevette, D -- McManaman, J L -- Appel, S H -- NS 20402/NS/NINDS NIH HHS/ -- NS 23058/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 May 13;240(4854):919-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, Wake Forest University, Bowman Gray School of Medicine, Winston-Salem, NC 27103.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3363373" target="_blank"〉PubMed〈/a〉
    Keywords: Ammonium Sulfate ; Animals ; Cell Survival ; Chemical Fractionation ; Chick Embryo ; Growth Substances/isolation & purification/*pharmacology ; Hindlimb ; Motor Neurons/*cytology ; Muscles/analysis/embryology/innervation ; Nerve Growth Factors/pharmacology ; Tissue Extracts/isolation & purification/pharmacology
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    Assembly of functional U1 and U2 human-amphibian hybrid snRNPs in Xenopus laevis oocytes (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-09-09
    Description: Oligonucleotides complementary to regions of U1 and U2 small nuclear RNAs (snRNAs), when injected into Xenopus laevis oocytes, rapidly induced the specific degradation of U1 and U2 snRNAs, respectively, and then themselves were degraded. After such treatment, splicing of simian virus 40 (SV40) late pre-mRNA transcribed from microinjected viral DNA was blocked in oocytes. If before introduction of SV40 DNA into oocytes HeLa cell U1 or U2 snRNAs were injected and allowed to assemble into small nuclear ribonucleoprotein particle (snRNP)-like complexes, SV40 late RNA was as efficiently spliced as in oocytes that did not receive U1 or U2 oligonucleotides. This demonstrates that oocytes can form fully functional hybrid U1 and U2 snRNPs consisting of human snRNA and amphibian proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pan, Z Q -- Prives, C -- CA33620/CA/NCI NIH HHS/ -- CA46121/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 9;241(4871):1328-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Columbia University, New York, NY 10027.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2970672" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Humans ; Macromolecular Substances ; Oocytes ; *RNA Splicing ; *RNA, Small Nuclear ; *Ribonucleoproteins ; Ribonucleoproteins, Small Nuclear ; Species Specificity ; Structure-Activity Relationship ; Xenopus laevis
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    Molecular cloning of odorant-binding protein: member of a ligand carrier family (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-07-15
    Description: Odorant-binding protein (OBP) is found in nasal epithelium, and it selectively binds odorants. Three complementary DNAs encoding rat odorant-binding protein have now been cloned and sequenced. One clone contains an open reading frame predicted to encode an 18,091-dalton protein. RNA blot analysis confirms the localization of OBP messenger RNA in the nasal epithelium. This OBP has 33 percent amino acid identity to alpha 2-microglobulin, a secreted plasma protein. Other members of an alpha 2-microglobulin superfamily bind and transport hydrophobic ligands. Thus, OBP probably binds and carries odorants within the nasal epithelium to putative olfactory receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pevsner, J -- Reed, R R -- Feinstein, P G -- Snyder, S H -- DA-00074/DA/NIDA NIH HHS/ -- GM-07626/GM/NIGMS NIH HHS/ -- P01 CA16519-13/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 15;241(4863):336-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3388043" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/*genetics ; Cloning, Molecular ; Ligands ; Membrane Proteins/*genetics ; Molecular Sequence Data ; Nasal Mucosa/*physiology ; Rats ; *Receptors, Odorant ; Smell/*physiology
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    Helix signals in proteins (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-17
    Description: The alpha helix, first proposed by Pauling and co-workers, is a hallmark of protein structure, and much effort has been directed toward understanding which sequences can form helices. The helix hypothesis, introduced here, provides a tentative answer to this question. The hypothesis states that a necessary condition for helix formation is the presence of residues flanking the helix termini whose side chains can form hydrogen bonds with the initial four-helix greater than N-H groups and final four-helix greater than C-O groups; these eight groups would otherwise lack intrahelical partners. This simple hypothesis implies the existence of a stereochemical code in which certain sequences have the hydrogen-bonding capacity to function as helix boundaries and thereby enable the helix to form autonomously. The three-dimensional structure of a protein is a consequence of the genetic code, but the rules relating sequence to structure are still unknown. The ensuing analysis supports the idea that a stereochemical code for the alpha helix resides in its boundary residues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Presta, L G -- Rose, G D -- AG 06084/AG/NIA NIH HHS/ -- GM 29458/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 17;240(4859):1632-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, Hershey Medical Center, Pennsylvania State University, Hershey 17033.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2837824" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carboxypeptidases ; Carboxypeptidases A ; Cytochrome c Group ; Flavodoxin ; Humans ; Hydrogen Bonding ; Models, Chemical ; Molecular Sequence Data ; Muramidase ; Myoglobin ; Pancreatic Polypeptide ; Parvalbumins ; Plastocyanin ; *Protein Conformation ; Ribonucleases ; Scorpion Venoms ; Tetrahydrofolate Dehydrogenase ; Triose-Phosphate Isomerase ; Trypsin Inhibitors ; X-Ray Diffraction
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    Cat research at Cornell (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-12-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rhodes, F H -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1361.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201224" target="_blank"〉PubMed〈/a〉
    Keywords: *Animal Experimentation ; Animals ; Behavioral Research ; Bioethics ; *Cats ; Federal Government ; New York ; *Research ; Universities
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    Heat shock is lethal to fibroblasts microinjected with antibodies against hsp70 (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-10-21
    Description: Synthesis of a small group of highly conserved proteins in response to elevated temperature and other agents that induce stress is a universal feature of prokaryotic and eukaryotic cells. Although correlative evidence suggests that these proteins play a role in enhancing survival during and after stress, there is no direct evidence to support this in mammalian cells. To assess the role of the most highly conserved heat shock protein (hsp) family during heat shock, affinity-purified monoclonal antibodies to hsp70 were introduced into fibroblasts by needle microinjection. In addition to impairing the heat-induced translocation of hsp70 proteins into the nucleus after mild heat shock treatment, injected cells were unable to survive a brief incubation at 45 degrees C. Cells injected with control antibodies survived a similar heat shock. These results indicate that functional hsp70 is required for survival of these cells during and after thermal stress.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Riabowol, K T -- Mizzen, L A -- Welch, W J -- GM33551/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Oct 21;242(4877):433-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, NY 11724.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3175665" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/administration & dosage ; Antigen-Antibody Complex ; Cell Survival ; Fibroblasts/cytology ; Heat-Shock Proteins/immunology/*physiology ; *Hot Temperature ; Microinjections ; Rats
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    Panda conservation (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-11-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robbins, C T -- Baer, J F -- Wright, R W -- Nelson, R J -- New York, N.Y. -- Science. 1988 Nov 11;242(4880):845.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3055297" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Zoo/*physiology ; Carnivora/*physiology ; Reproductive Techniques/*veterinary
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    Beef and chocolate: a partial reprieve (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-05-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roberts, L -- New York, N.Y. -- Science. 1988 May 27;240(4856):1149.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3375809" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cacao ; Cattle ; Dietary Fats/adverse effects ; *Meat ; *Plants, Edible ; Stearic Acids/physiology
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    Phosphatidylinositol-glycan anchors of membrane proteins: potential precursors of insulin mediators (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-22
    Description: BC3H1 myocytes release membrane-bound alkaline phosphatase to the incubation medium upon stimulation with insulin, following a time course that is consistent with the generation of dimyristoylglycerol and the appearance of a putative insulin mediator in the extracellular medium. The use of specific blocking agents shows, however, that alkaline phosphatase release and dimyristoylglycerol production are independent processes and that the blockade of either event inhibits the production of insulin mediator. These experiments suggest a new model of insulin action.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romero, G -- Luttrell, L -- Rogol, A -- Zeller, K -- Hewlett, E -- Larner, J -- AI 18000/AI/NIAID NIH HHS/ -- AM 14334/AM/NIADDK NIH HHS/ -- AM 22125/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 22;240(4851):509-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Virginia School of Medicine, Charlottesville 22908.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3282305" target="_blank"〉PubMed〈/a〉
    Keywords: Alkaline Phosphatase/metabolism/secretion ; Animals ; Diglycerides/metabolism ; Enzyme Activation/drug effects ; Extracellular Space/enzymology ; Glycolipids/*physiology ; In Vitro Techniques ; Insulin/*pharmacology ; Kinetics ; Membrane Glycoproteins/*physiology ; Phosphatidylinositols/*physiology ; Pyruvate Dehydrogenase Complex/metabolism
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    Grafting genetically modified cells to the damaged brain: restorative effects of NGF expression (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-16
    Description: Fibroblasts were genetically modified to secrete nerve growth factor (NGF) by infection with a retroviral vector and then implanted into the brains of rats that had surgical lesions of the fimbria-fornix. The grafted cells survived and produced sufficient NGF to prevent the degeneration of cholinergic neurons that would die without treatment. In addition, the protected cholinergic cells sprouted axons that projected in the direction of the cellular source of NGF. These results indicate that a combination of gene transfer and intracerebral grafting may provide an effective treatment for some disorders of the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenberg, M B -- Friedmann, T -- Robertson, R C -- Tuszynski, M -- Wolff, J A -- Breakefield, X O -- Gage, F H -- AG06088/AG/NIA NIH HHS/ -- HD20034/HD/NICHD NIH HHS/ -- NS24279/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 16;242(4885):1575-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatrics, University of California School of Medicine, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201248" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholinesterase/metabolism ; Animals ; Brain/cytology/enzymology/*pathology ; Cell Survival ; DNA/genetics ; Fibroblasts/metabolism/*transplantation ; Genetic Vectors ; Histocytochemistry ; Moloney murine leukemia virus/genetics ; Nerve Growth Factors/genetics/*physiology ; Rats
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    Recruitment dynamics in complex life cycles (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-16
    Description: Organisms living in the marine rocky intertidal zone compete for space. This, together with predation, physical disruption, and differing species tolerances to physiological stress, explains the structure of the ecological communities at some sites. At other sites the supply of larvae is limiting, and events in the offshore waters, such as wind-driven upwelling, explain the composition of intertidal communities. Whether the community ecology at a site is governed by adult-adult interactions within the site, or by limitations to the supply of larvae reaching the site, is determined by the regional pattern of circulation in the coastal waters. Models combining larval circulation with adult interactions can potentially forecast population fluctuations. These findings illustrate how processes in different ecological habitats are coupled.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roughgarden, J -- Gaines, S -- Possingham, H -- DE-FG03-85ER60362/DE/NIDCR NIH HHS/ -- NCA2-258/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 16;241(4872):1460-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Stanford University, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11538249" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ecology ; *Ecosystem ; Larva ; *Marine Biology ; *Models, Biological ; Pacific Ocean ; Plankton ; Population Dynamics ; Thoracica/*growth & development
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    Hair cell regeneration after acoustic trauma in adult Coturnix quail (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-24
    Description: Recovery of hair cells was studied at various times after acoustic trauma in adult quail. An initial loss of hair cells recovered to within 5 percent of the original number of cells. Tritium-labeled thymidine was injected after this acoustic trauma to determine if mitosis played a role in recovery of hair cells. Within 10 days of acoustic trauma, incorporation of [3H]thymidine was seen over the nuclei of hair cells and supporting cells in the region of initial hair cell loss. Thus, hair cell regeneration can occur after embryonic terminal mitosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryals, B M -- Rubel, E W -- NS24522/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 24;240(4860):1774-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Audiology and Speech Pathology, Veterans Administration Medical Center, Richmond, VA 23249.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3381101" target="_blank"〉PubMed〈/a〉
    Keywords: Age Factors ; Animals ; Cell Division ; Coturnix ; DNA Replication ; Hair Cells, Auditory/*cytology/physiology ; Hearing Loss, Noise-Induced/*physiopathology ; Time Factors
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    Site-directed mutagenesis of two trans-regulatory genes (tat-III,trs) of HIV-1 (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-02-19
    Description: Point mutations were introduced into the overlapping trans-regulatory genes (tat-III and trs) of human immunodeficiency virus type 1 (HIV-1), and the mutants were evaluated for virus expression. The results showed that tat-III has a positive transacting role and is required for transcriptional activation. A chain terminating mutation early in the trs gene resulted in an increase in transcription of viral messenger RNA as measured by nuclear transcription experiments, but only one major species of viral messenger RNA (1.8 kilobases) was detected, and little or no viral structural proteins were made. Thus, the trs gene product is essential for expression of virus structural proteins but, at the same time, may have a negative trans-regulatory role in transcription. Cotransfection of the point mutant proviruses defective in tat or trs with each other or with a complementary DNA clone containing tat and trs sequences restored the normal transcription pattern and subsequent virus production.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sadaie, M R -- Benter, T -- Wong-Staal, F -- New York, N.Y. -- Science. 1988 Feb 19;239(4842):910-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Tumor Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3277284" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyltransferases/genetics ; Acquired Immunodeficiency Syndrome/immunology ; Animals ; Cell Line ; Chloramphenicol O-Acetyltransferase ; Codon ; DNA/genetics ; *Genes, Regulator ; *Genes, Viral ; HIV/*genetics ; Humans ; Immunosorbent Techniques ; *Mutation ; Plasmids ; RNA, Messenger/genetics ; RNA, Viral/genetics ; Transcription, Genetic ; Transfection
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    Expression of c-fos protein in brain: metabolic mapping at the cellular level (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-03
    Description: The proto-oncogene c-fos is expressed in neurons in response to direct stimulation by growth factors and neurotransmitters. In order to determine whether the c-fos protein (Fos) and Fos-related proteins can be induced in response to polysynaptic activation, rat hindlimb motor/sensory cortex was stimulated electrically and Fos expression examined immunohistochemically. Three hours after the onset of stimulation, focal nuclear Fos staining was seen in motor and sensory thalamus, pontine nuclei, globus pallidus, and cerebellum. Moreover, 24-hour water deprivation resulted in Fos expression in paraventricular and supraoptic nuclei. Fos immunohistochemistry therefore provides a cellular method to label polysynaptically activated neurons and thereby map functional pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sagar, S M -- Sharp, F R -- Curran, T -- EY05721/EY/NEI NIH HHS/ -- NS24666/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 3;240(4857):1328-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology, University of California, San Francisco.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3131879" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*metabolism ; Cell Nucleus/metabolism ; Cerebellum/metabolism ; Cerebral Cortex/metabolism ; Electric Stimulation ; *Gene Expression Regulation ; Globus Pallidus/metabolism ; Hippocampus/metabolism ; Hypothalamus/metabolism ; Immunohistochemistry ; Motor Cortex/physiology ; Neurons/metabolism ; Pons/metabolism ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-fos ; Rats ; Thalamus/metabolism
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    A fossil reptile embryo from the Middle Triassic of the Alps (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-02-12
    Description: The first nothosaur (Neusticosaurus sp.) embryo, one of the very few fossil embryos known, provides a rare glimpse at reproduction in extinct reptiles. The specimen from the southern Alpine Middle Triassic (about 230 million years ago) was recognized as an embryo in comparison with an exceptionally large and well-understood sample of juvenile and sexed adult Neusticosaurus sp. The skeleton shows many embryonic features and may well be the smallest fossil reptile known (body length 51 millimeters). It reached only 22% of mean adult length whereas modern reptiles of this size do not hatch before they reach about 30% of mean adult length. The question of ovipary versus vivipary in pachypleurosaurs is discussed in light of the embryo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sander, P M -- New York, N.Y. -- Science. 1988 Feb 12;239(4841 Pt 1):780-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Palaontologisches Institut und Museum, Universitat Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3340859" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone and Bones/anatomy & histology ; Embryo, Nonmammalian/anatomy & histology ; *Fossils ; Osteogenesis ; *Paleontology ; Reptiles/anatomy & histology/*embryology ; Switzerland
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    Molecular crowding on the cell surface (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-01-01
    Description: Strong steric interactions among proteins on crowded living cell surfaces were revealed by measurements of the equilibrium spatial distributions of proteins in applied potential gradients. The fraction of accessible surface occupied by mobile surface proteins can be accurately represented by including steric exclusion in the statistical thermodynamic analysis of the data. The analyses revealed enhanced, concentration-dependent activity coefficients, implying unanticipated thermodynamic activity even at typical cell surface receptor concentrations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryan, T A -- Myers, J -- Holowka, D -- Baird, B -- Webb, W W -- AI18306/AI/NIAID NIH HHS/ -- AI22449/AI/NIAID NIH HHS/ -- GM33028/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 1;239(4835):61-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Cornell University, Ithaca, NY 14853.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2962287" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/*physiology ; *Membrane Fluidity ; Membrane Proteins/*physiology ; Rats ; Receptors, Fc/physiology ; Receptors, IgE ; Thermodynamics ; Tumor Cells, Cultured
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    The neural cell adhesion molecule (NCAM) as a regulator of cell-cell interactions (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-04-01
    Description: The neural cell adhesion molecule (NCAM) can influence a number of diverse intercellular events, including junctional communication, the association of axons with pathways and targets, and signals that alter levels of neurotransmitter enzymes. These pleiotropic effects appear to reflect the ability of NCAM to regulate membrane-membrane contact required to initiate specific interactions between other molecules. Such regulation can occur through changes in either NCAM expression or the molecule's content of polysialic acid (PSA). When NCAM with a low PSA content is expressed, adhesion is increased and contact-dependent events are triggered. In contrast, the large excluded volume of NCAM PSA can inhibit cell-cell interactions through hindrance of overall membrane apposition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rutishauser, U -- Acheson, A -- Hall, A K -- Mann, D M -- Sunshine, J -- EY06107/EY/NEI NIH HHS/ -- HD18369/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 1;240(4848):53-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Genetics and Anatomy, Case Western Reserve University School of Medicine, Cleveland, OH 44106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3281256" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Surface/*physiology ; Cell Adhesion ; Cell Adhesion Molecules ; *Cell Communication ; Cell Membrane/physiology ; Membrane Glycoproteins/physiology ; Sialic Acids/metabolism
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    cAMP evokes long-term facilitation in Aplysia sensory neurons that requires new protein synthesis (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-17
    Description: Behavioral sensitization leads to both short- and long-term enhancement of synaptic transmission between the sensory and motor neurons of the gill-withdrawal reflex in Aplysia. Serotonin (5-HT), a transmitter important for short-term sensitization, can evoke long-term enhancement of synaptic strength detected 1 day later. Because 5-HT mediates short-term facilitation through adenosine 3',5'-monophosphate (cAMP)-dependent protein phosphorylation, the role of cAMP in the long-term modulation of this identified synapse was examined. Like 5-HT, cAMP can also evoke long-term facilitation lasting 24 hours. Unlike the short-term change, the long-lasting change is blocked by anisomycin, a reversible inhibitor of protein synthesis, and therefore must involve the synthesis of gene products not required for the short-term change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schacher, S -- Castellucci, V F -- Kandel, E R -- GM 32099/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 17;240(4859):1667-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Neurobiology and Behavior, Howard Hughes Medical Institute, College of Physicians and Surgeons of Columbia University, New York State Psychiatric Institute, NY 10032.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2454509" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-3-isobutylxanthine/pharmacology ; Animals ; Anisomycin/pharmacology ; Aplysia/*physiology ; Cells, Cultured ; Cyclic AMP/analogs & derivatives/*pharmacology ; Evoked Potentials/drug effects ; Motor Neurons/physiology ; Neurons, Afferent/drug effects/*physiology ; *Protein Biosynthesis ; Serotonin/pharmacology ; Synapses/drug effects/physiology
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    Mammalian glucocorticoid receptor derivatives enhance transcription in yeast (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-08-19
    Description: In mammalian cells, the glucocorticoid receptor binds specifically to glucocorticoid response element (GRE) DNA sequences and enhances transcription from linked promoters. It is shown here that derivatives of the glucocorticoid receptor also enhance transcription when expressed in yeast. Receptor-mediated enhancement in yeast was observed in fusions of GRE sequences to the yeast cytochrome c1 (CYC1) promoter; the CYC1 upstream activator sequences were not essential, since enhancement was observed in fusions of GREs to mutant CYC1 promoters retaining only the TATA region and transcription startpoints. It is concluded that the receptor operates by a common, highly conserved mechanism in yeast and mammalian cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schena, M -- Yamamoto, K R -- CA20535-12/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Aug 19;241(4868):965-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3043665" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; DNA/metabolism ; *Enhancer Elements, Genetic ; Gene Expression Regulation ; Immunoassay ; Plasmids ; Promoter Regions, Genetic ; Rats ; Receptors, Glucocorticoid/*genetics ; Saccharomyces cerevisiae/*genetics ; *Transcription, Genetic
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    Calpain II involvement in mitosis (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-05-13
    Description: Mitotic spindle disassembly requires major structural alterations in the associated cytoskeletal proteins and mitosis is known to be associated with Ca2+-sequestering phenomena and calcium transients. To examine the possible involvement of a ubiquitous Ca2+-activated protease, calpain II, in the mitotic process, synchronized PtK1 cells were monitored by immunofluorescence for the relocation of calpain II. The plasma membrane was the predominant location of calpain II in interphase. However, as mitosis progressed, calpain II relocated to (i) an association with mitotic chromosomes, (ii) a perinuclear location in anaphase, and (iii) a mid-body location in telophase. Microinjection of calpain II near the nucleus of a PtK1 cell promoted the onset of metaphase. Injection of calpain II at late metaphase promoted a precocious disassembly of the mitotic spindle and the onset of anaphase. These data suggest that calpain II is involved in mitosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schollmeyer, J E -- New York, N.Y. -- Science. 1988 May 13;240(4854):911-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Department of Agriculture, Roman L. Hruska Meat Animal Research Center, Clay Center, NE 68933.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2834825" target="_blank"〉PubMed〈/a〉
    Keywords: Anaphase/drug effects ; Animals ; Calcium/pharmacology ; Calcium-Binding Proteins/pharmacology ; Calpain/antagonists & inhibitors/pharmacology/*physiology ; Cell Line ; Cell Membrane/enzymology ; Cell Nucleus/enzymology ; Chromosomes/metabolism ; Enzyme Activation ; Fluorescent Antibody Technique ; Fluorescent Dyes ; Interphase ; Metaphase/drug effects ; *Mitosis ; Muscles/enzymology ; Rhodamines ; Spindle Apparatus/drug effects ; Swine
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    The ras oncogenes increase the intrinsic resistance of NIH 3T3 cells to ionizing radiation (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-02-05
    Description: Identification of genes that function to protect cells from radiation damage is an essential step in understanding the molecular mechanisms by which mammalian cells cope with ionizing radiation. The intrinsic radiation resistance (D0) of NIH 3T3 cells was markedly and significantly increased by transformation with ras oncogenes activated by missense mutations. This radiobiologic activity appeared to be a specific consequence of the ras mutations rather than of transformation, since revertant cells that contained functional ras genes (but were no longer phenotypically transformed) retained their increased D0's.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sklar, M D -- CA 41166/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Feb 5;239(4840):645-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor 48109.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3277276" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Survival/*radiation effects ; Cell Transformation, Neoplastic ; Cells, Cultured ; Clone Cells ; Dose-Response Relationship, Radiation ; *Genes, ras ; Mice ; Mice, Inbred Strains
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    Neural transplantation: a call for patience rather than patients (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sladek, J R Jr -- Shoulson, I -- New York, N.Y. -- Science. 1988 Jun 10;240(4858):1386-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Medicine and Dentistry, University of Rochester.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3375820" target="_blank"〉PubMed〈/a〉
    Keywords: Aborted Fetus ; Animal Experimentation ; Animals ; Brain/physiopathology ; Disease Models, Animal ; *Embryo Research ; *Fetal Research ; Humans ; Neurons/*transplantation ; Parkinson Disease/physiopathology/*therapy ; Research Design ; Therapeutic Human Experimentation ; *Tissue and Organ Procurement ; Parkinson's disease should not repeat the mistakes made by adrenal autograft ; investigators, who operated on far more humans than on nonhuman primates because ; of a single unconfirmed report of dramatic improvement in two Mexican patients. ; Citing extensive data from experimental transplants conducted as early as 1944, ; the authors argue that, until a sufficient number of animal studies have been ; performed to answer many crucial questions about human fetal tissue transplants, ; researchers should refrain from experimenting on human patients.
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    Immunotherapy of the nonobese diabetic mouse: treatment with an antibody to T-helper lymphocytes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-29
    Description: Spontaneous diabetes mellitus was blocked in nonobese diabetic mice by treatment with a monoclonal antibody against the L3T4 determinant present on the surface of T-helper lymphocytes. Sustained treatment with the monoclonal antibody led to cessation of the lymphocytic infiltration associated with the destruction of the insulin-producing beta cells. Moreover, the mice remained normoglycemic after the antibody therapy was stopped. These studies indicate that immunotherapy with monoclonal antibodies to the lymphocyte subset may not only halt the progression of diabetes, but may lead to long-term reversal of the disease after therapy has ended.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shizuru, J A -- Taylor-Edwards, C -- Banks, B A -- Gregory, A K -- Fathman, C G -- AI11313/AI/NIAID NIH HHS/ -- DK39959/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1988 Apr 29;240(4852):659-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Stanford University Medical Center, CA 94305-5111.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2966437" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/*therapeutic use ; Antigens, Differentiation, T-Lymphocyte/*immunology ; Cyclosporins/therapeutic use ; Diabetes Mellitus, Experimental/pathology/*therapy ; Female ; *Immunotherapy ; Islets of Langerhans/pathology ; Lymphocytes/pathology ; Mice ; Mice, Inbred ICR ; T-Lymphocytes, Helper-Inducer/*immunology/pathology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Antagonistic adrenergic-muscarinic regulation of M current in smooth muscle cells (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-08
    Description: The beta-adrenergic agonist isoproterenol and analogs of adenosine 3',5'-monophosphate (cAMP) induced a potassium current, M current, in freshly dissociated gastric smooth muscle cells. Muscarinic agonists suppress this current, apparently by acting at a locus downstream from regulation of cAMP levels by adenylate cyclase and phosphodiesterase. Thus, M current can be induced by an agent and regulated in antagonistic fashion by beta-adrenergic and muscarinic systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sims, S M -- Singer, J J -- Walsh, J V Jr -- DK 31620/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 8;239(4836):190-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Massachusetts Medical School Worcester 01655.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2827305" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/pharmacology ; Animals ; Bufo marinus ; Cyclic AMP/physiology ; Electric Conductivity ; In Vitro Techniques ; Isoproterenol/pharmacology ; Membrane Potentials/drug effects ; Muscarine/pharmacology ; Muscle, Smooth/*physiology ; Potassium/*physiology ; Receptors, Adrenergic, beta/*physiology ; Receptors, Muscarinic/*physiology ; Stomach/physiology
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    Neuronal cytomechanics: the actin-based motility of growth cones (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-04
    Description: The patterns of synaptic connection that underlie brain function depend on the elaborate forms characteristic of neurons. It is therefore a central goal of neuroscience to understand the molecular basis for neuronal shape. Neuronal pathfinding during development is one major determinant of neuronal shape: growing nerve axons and dendrites must navigate, branch, and locate targets in response to extracellular cue molecules within the embryo. The leading tips of growing nerve processes, structures known as growth cones, contain especially high concentrations of the ubiquitous mechanochemical protein actin. Force generation involving this cytoskeletal molecule appears to be essential to the ability of growing nerve fibers to respond structurally to extracellular cues. New results from electronically enhanced light microscopy of living growth cones are helping to show how actin-based forces guide neurite growth and synapse formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, S J -- New York, N.Y. -- Science. 1988 Nov 4;242(4879):708-15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Molecular Neurobiology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3055292" target="_blank"〉PubMed〈/a〉
    Keywords: Actins/*physiology ; Animals ; *Cell Movement/drug effects ; Cytochalasins/pharmacology ; Cytoskeleton/physiology ; Morphogenesis ; Myosins/physiology ; Neurons/*physiology ; Synapses/*physiology
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    Astrocytes synthesize angiotensinogen in brain (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-12-09
    Description: Cell types associated with angiotensinogen mRNA in rat brain were identified in individual brain sections by in situ hybridization with tritiated RNA probes or with a sulfur-35--labeled oligonucleotide combined with immunocytochemical detection of either glial fibrillary acidic protein (GFAP) for astrocytes or microtubule-associated protein (MAP-2) for neurons. Autoradiography revealed silver grains clustered primarily over GFAP-reactive soma and processes; most grain clusters were not associated with MAP-2--reactive cells. These results demonstrate that, in contrast to other known neuropeptide precursors, angiotensinogen is synthesized by glia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stornetta, R L -- Hawelu-Johnson, C L -- Guyenet, P G -- Lynch, K R -- R01 HL33513/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1444-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Virginia School of Medicine, Charlottesville 22908.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201232" target="_blank"〉PubMed〈/a〉
    Keywords: Angiotensinogen/*biosynthesis/genetics ; Animals ; Astrocytes/*metabolism ; Brain/*metabolism ; Glial Fibrillary Acidic Protein/analysis ; Histocytochemistry ; Microtubule-Associated Proteins/analysis ; Nucleic Acid Hybridization ; RNA, Messenger/analysis/genetics ; Rats
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    Antisense RNA directed against the 3' noncoding region prevents dormant mRNA activation in mouse oocytes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-08-05
    Description: Primary mouse oocytes contain untranslated stable messenger RNA for tissue plasminogen activator (t-PA). During meiotic maturation, this maternal mRNA undergoes a 3'-polyadenylation, is translated, and is degraded. Injections of maturing oocytes with different antisense RNA's complementary to both coding and noncoding portions of t-PA mRNA all selectively blocked t-PA synthesis. RNA blot analysis of t-PA mRNA in injected, matured oocytes suggested a cleavage of the RNA.RNA hybrid region, yielding a stable 5' portion, and an unstable 3' portion. In primary oocytes, the 3' noncoding region was susceptible to cleavage, while the other portions of the mRNA were blocked from hybrid formation until maturation occurred. Injection of antisense RNA complementary to 103 nucleotides of its extreme 3' untranslated region was sufficient to prevent the polyadenylation, translational activation, and destabilization of t-PA mRNA. These results demonstrate a critical role for the 3' noncoding region of a dormant mRNA in its translational recruitment during meiotic maturation of mouse oocytes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strickland, S -- Huarte, J -- Belin, D -- Vassalli, A -- Rickles, R J -- Vassalli, J D -- HD-17875/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1988 Aug 5;241(4866):680-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Histology and Embryology, University of Geneva Medical School, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2456615" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Mice ; Nucleic Acid Hybridization ; Oocytes/*metabolism ; Poly A/metabolism ; Protein Biosynthesis/drug effects ; RNA/*pharmacology ; RNA, Antisense ; RNA, Messenger/*antagonists & inhibitors/metabolism ; Tissue Plasminogen Activator/*genetics
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    Steroid binding at sigma receptors suggests a link between endocrine, nervous, and immune systems (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-04-08
    Description: Specific sigma binding sites have been identified in the mammalian brain and lymphoid tissue. In this study, certain gonadal and adrenal steroids, particularly progesterone, were found to inhibit sigma receptor binding in homogenates of brain and spleen. The findings suggest that steroids are naturally occurring ligands for sigma receptors and raise the possibility that these sites mediate some aspects of steroid-induced mental disturbances and alterations in immune functions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Su, T P -- London, E D -- Jaffe, J H -- New York, N.Y. -- Science. 1988 Apr 8;240(4849):219-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Addiction Research Center, National Institute on Drug Abuse, Baltimore, MD 21224.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2832949" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/metabolism ; Endocrine Glands/*physiology ; Guinea Pigs ; Haloperidol/metabolism ; *Immunity ; Male ; *Nervous System Physiological Phenomena ; Phenazocine/analogs & derivatives/metabolism ; Receptors, Opioid/*metabolism ; Receptors, sigma ; Spleen/metabolism ; Steroids/*metabolism
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    A transcriptional enhancer 3' of C beta 2 in the T cell receptor beta locus (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-07-08
    Description: Run-on transcription experiments were used to demonstrate that transcription of T cell receptor beta chain V genes is activated by DNA rearrangement, in a manner similar to immunoglobulin genes. A transcriptional enhancer likely to be involved in this activation has been identified. A 25-kilobase region from J beta 1 to V beta 14 was tested for enhancer activity by transient transfections, and an enhancer was found 7.5 kilobases 3' of C beta 2. The beta enhancer has low activity relative to the simian virus 40 viral enhancer, does not display a preference for V beta promoters, has a T cell-specific activity, and binds two purified immunoglobulin heavy chain enhancer factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDougall, S -- Peterson, C L -- Calame, K -- GM29361/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 8;241(4862):205-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, UCLA School of Medicine 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2968651" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chromosome Mapping ; *Enhancer Elements, Genetic ; Gene Expression Regulation ; Genes, Immunoglobulin ; Immunoglobulin Heavy Chains/genetics ; In Vitro Techniques ; Mice ; Nuclear Proteins/physiology ; Receptors, Antigen, T-Cell/*genetics ; Receptors, Antigen, T-Cell, alpha-beta ; *Regulatory Sequences, Nucleic Acid ; Transcription Factors/physiology ; Transcription, Genetic
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    Designing food by engineering animals (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-04-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, M -- New York, N.Y. -- Science. 1988 Apr 8;240(4849):136.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3162616" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Dietary Fats ; Genetic Engineering ; *Meat
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    Experimentally induced visual projections into auditory thalamus and cortex (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-09
    Description: Retinal cells have been induced to project into the medial geniculate nucleus, the principal auditory thalamic nucleus, in newborn ferrets by reduction of targets of retinal axons in one hemisphere and creation of alternative terminal space for these fibers in the auditory thalamus. Many cells in the medial geniculate nucleus are then visually driven, have large receptive fields, and receive input from retinal ganglion cells with small somata and slow conduction velocities. Visual cells with long conduction latencies and large contralateral receptive fields can also be recorded in primary auditory cortex. Some visual cells in auditory cortex are direction selective or have oriented receptive fields that resemble those of complex cells in primary visual cortex. Thus, functional visual projections can be routed into nonvisual structures in higher mammals, suggesting that the modality of a sensory thalamic nucleus or cortical area may be specified by its inputs during development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sur, M -- Garraghty, P E -- Roe, A W -- EY07023/EY/NEI NIH HHS/ -- EY07719/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1437-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2462279" target="_blank"〉PubMed〈/a〉
    Keywords: Afferent Pathways/physiology ; Animals ; Animals, Newborn ; Auditory Cortex/*physiology ; Axonal Transport ; Ferrets ; Geniculate Bodies/physiology ; Reference Values ; Retina/*physiology ; Superior Colliculi/physiology ; Thalamic Nuclei/*physiology ; Visual Cortex/*physiology ; Visual Pathways/*physiology ; Visual Perception
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    Cryopreservation, culture, and transplantation of human fetal mesencephalic tissue into monkeys (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-11-04
    Description: Studies in animals suggest that fetal neural grafts might restore lost neurological function in Parkinson's disease. In monkeys, such grafts survive for many months and reverse signs of parkinsonism, without attendant graft rejection. The successful and reliable application of a similar transplantation procedure to human patients, however, will require neural tissue obtained from human fetal cadavers, with demonstrated cellular identity, viability, and biological safety. In this report, human fetal neural tissue was successfully grafted into the brains of monkeys. Neural tissue was collected from human fetal cadavers after 9 to 12 weeks of gestation and cryopreserved in liquid nitrogen. Viability after up to 2 months of storage was demonstrated by cell culture and by transplantation into monkeys. Cryopreservation and storage of human fetal neural tissue would allow formation of a tissue bank. The stored cells could then be specifically tested to assure their cellular identity, viability, and bacteriological and virological safety before clinical use. The capacity to collect and maintain viable human fetal neural tissue would also facilitate research efforts to understand the development and function of the human brain and provide opportunities to study neurological diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Redmond, D E Jr -- Naftolin, F -- Collier, T J -- Leranth, C -- Robbins, R J -- Sladek, C D -- Roth, R H -- Sladek, J R Jr -- New York, N.Y. -- Science. 1988 Nov 4;242(4879):768-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, Yale University School of Medicine, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2903552" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Survival ; Cells, Cultured ; Cercopithecus ; Fetus ; Freezing ; Humans ; Male ; Mesencephalon/cytology/embryology/enzymology/*transplantation ; Preservation, Biological ; Transplantation, Heterologous ; Tyrosine 3-Monooxygenase/metabolism
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    Production of stable rabbit-mouse hybridomas that secrete rabbit mAb of defined specificity (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-24
    Description: Inclusion of normal rabbit serum (NRS) in culture medium after interspecific fusion of hyperimmunized rabbit spleen cells with murine SP2/0 myeloma cells produced 271 rabbit-mouse hybridomas (RMHs) that secreted rabbit immunoglobulin against group A Streptococcus (GAS). Continued use of NRS-supplemented medium during cloning yielded stabilized monoclonal RMH lines that have secreted GAS-specific rabbit antibody at concentrations similar to murine hybridomas (3 to 8 micrograms per 10(6) cells per 24 hours), for over 4 months of culture in vitro. The use of NRS as a medium supplement during initial culture, cloning, and stabilization of RMHs enables production of considerably more specific rabbit monoclonal antibody (mAb)-secreting RMHs than have previously been reported.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raybould, T J -- Takahashi, M -- New York, N.Y. -- Science. 1988 Jun 24;240(4860):1788-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Allelix Inc., Diagnostics Division, Mississauga, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3289119" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Bacterial/*immunology ; Antibodies, Monoclonal/*immunology ; Antibody Specificity ; Cell Fusion ; Cell Line ; Hybridomas/*immunology ; Karyotyping ; Mice/*immunology ; Rabbits/*immunology ; Streptococcus pyogenes/immunology ; Time Factors
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    Synaptic reorganization in the hippocampus induced by abnormal functional activity (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-03-04
    Description: Abnormal functional activity induces long-lasting physiological alterations in neural pathways that may play a role in the development of epilepsy. The cellular mechanisms of these alterations are not well understood. One hypothesis is that abnormal activity causes structural reorganization of neural pathways and promotes epileptogenesis. This report provides morphological evidence that synchronous perforant path activation and kindling of limbic pathways induce axonal growth and synaptic reorganization in the hippocampus, in the absence of overt morphological damage. The results show a previously unrecognized anatomic plasticity associated with synchronous activity and development of epileptic seizures in neural pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sutula, T -- He, X X -- Cavazos, J -- Scott, G -- K07-NS00808/NS/NINDS NIH HHS/ -- R29-NS25020/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Mar 4;239(4844):1147-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology, University of Wisconsin, Madison 53792.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2449733" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/ultrastructure ; Cytoplasmic Granules/ultrastructure ; Electric Stimulation ; Electrophysiology ; Hippocampus/physiopathology/*ultrastructure ; Histocytochemistry ; Kindling, Neurologic ; Microscopy, Electron ; Neural Pathways/ultrastructure ; Neurons/ultrastructure ; Rats ; Seizures/*pathology/physiopathology ; Staining and Labeling ; Synapses/*ultrastructure
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    Cloning of a membrane protein that induces a slow voltage-gated potassium current (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-11-18
    Description: A rat kidney messenger RNA that induces a slowly activating, voltage-dependent potassium current on its expression in Xenopus oocytes was identified by combining molecular cloning with an electrophysiological assay. The cloned complementary DNA encodes a novel membrane protein that consists of 130 amino acids with a single putative transmembrane domain. This protein differs from the known ion channel proteins but is involved in the induction of selective permeation of potassium ions by membrane depolarization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takumi, T -- Ohkubo, H -- Nakanishi, S -- New York, N.Y. -- Science. 1988 Nov 18;242(4881):1042-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Immunology, Kyoto University Faculty of Medicine, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3194754" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Blotting, Northern ; Cloning, Molecular ; DNA/genetics ; Electric Conductivity ; Membrane Potentials ; Membrane Proteins/*genetics ; Molecular Sequence Data ; Molecular Weight ; Potassium Channels/*physiology ; Rats ; Xenopus laevis
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    Vasopressin mRNA in the suprachiasmatic nuclei: daily regulation of polyadenylate tail length (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-07-15
    Description: Daily variation has been found in the length of the polyadenylate tail attached to vasopressin messenger RNA in the suprachiasmatic nuclei, which is the location of an endogenous circadian pacemaker in mammals. No such variation was found in the supraoptic or paraventricular nuclei. This variation in the length of the polyadenylate tail may underlie the circadian rhythm of vasopressin peptide levels in cerebrospinal fluid and is a unique example of a daily rhythm in messenger RNA structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robinson, B G -- Frim, D M -- Schwartz, W J -- Majzoub, J A -- 1P50HL36568/HL/NHLBI NIH HHS/ -- R01NS24542/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 15;241(4863):342-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3388044" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arginine Vasopressin/*physiology ; Biological Clocks ; Circadian Rhythm ; Gene Expression Regulation ; Poly A/*physiology ; RNA, Messenger/*physiology ; Rats ; Suprachiasmatic Nucleus/*physiology
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    Mesoderm induction in amphibians: the role of TGF-beta 2-like factors (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-02-12
    Description: Mesoderm induction in the amphibian embryo can be studied by exposing animal region explants (destined to become ectoderm) to appropriate stimuli and assaying the appearance of mesodermal products like alpha-actin messenger RNA. Transforming growth factor beta 2 (TGF-beta 2), but not TGF-beta 1, was active in alpha-actin induction, while addition of fibroblast growth factor had a small synergistic effect. Medium conditioned by Xenopus XTC cells (XTC-CM), known to have powerful mesoderm-inducing activity, was shown to contain TGF-beta-like activity as measured by a radioreceptor binding assay, colony formation in NRK cells, and growth inhibition in CCL64 cells. The activity of XTC-CM in mesoderm induction and in growth inhibition of CCL64 cells was inhibited partially by antibodies to TGF-beta 2 but not by antibodies to TGF-beta 1. Thus, a TGF-beta 2-like molecule may be involved in mesoderm induction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosa, F -- Roberts, A B -- Danielpour, D -- Dart, L L -- Sporn, M B -- Dawid, I B -- New York, N.Y. -- Science. 1988 Feb 12;239(4841 Pt 1):783-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3422517" target="_blank"〉PubMed〈/a〉
    Keywords: Actins/genetics ; Amphibians/*embryology ; Animals ; Cell Division/drug effects ; Cell Line ; Embryo, Nonmammalian/physiology ; Growth Substances/*physiology ; Mesoderm/*physiology ; Peptides/pharmacology/*physiology ; RNA, Messenger/genetics ; Transforming Growth Factors ; Xenopus
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  • 77
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    In situ transcription: specific synthesis of complementary DNA in fixed tissue sections (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-17
    Description: A technique, in situ transcription, is described, in which reverse transcription of mRNAs is achieved within fixed tissue sections. An oligonucleotide complementary to proopiomelanocortin (POMC) mRNA was used as a primer for the specific synthesis of radiolabeled POMC cDNA in fixed sections of rat pituitary, thus permitting the rapid anatomical localization of POMC mRNA by autoradiography. Intermediate lobe signal intensities were sensitive to dopaminergic drugs, demonstrating that the method can be used for studies of mRNA regulation. The transcripts may also be eluted from tissue sections for a variety of uses, including the identification and cloning of autoradiographically localized cDNAs from small amounts of tissue.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tecott, L H -- Barchas, J D -- Eberwine, J H -- DA-05010/DA/NIDA NIH HHS/ -- MH-23861/MH/NIMH NIH HHS/ -- MH09099/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 17;240(4859):1661-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nancy Pritzker Laboratory of Behavioral Neurochemistry, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2454508" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cloning, Molecular ; DNA/*biosynthesis ; Deoxycytidine/metabolism ; Electrophoresis, Polyacrylamide Gel ; Nucleic Acid Denaturation ; Nucleic Acid Hybridization ; Oligonucleotides/genetics ; Pituitary Gland/*metabolism ; Pro-Opiomelanocortin/*genetics ; RNA, Messenger/*metabolism ; RNA-Directed DNA Polymerase/metabolism ; Rats ; *Transcription, Genetic
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  • 78
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    Selection of variable-joining region combinations in the alpha chain of the T cell receptor (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-09-09
    Description: Most T lymphocytes express an antigen-specific receptor composed of two subunits, alpha and beta, each of which can exhibit structural variability. A complex selection process operates on T cells during development in the thymus such that cells expressing only particular alpha beta-receptors migrate to the periphery. The alpha-chain repertoire was dissected at different stages of the selection process by using the polymerase chain reaction (PCR) technique to amplify only those transcripts of a particular variable region gene (V58). Sequences from these V58 cDNAs reveal the predominant expression of four joining (J) segments by T cells in the adult thymus, suggesting that molecular or cellular processes select particular V alpha J alpha combinations during development. T cells expressing one of these V58J alpha chains appear to have been negatively selected at a later stage, since these transcripts were present in the spleen at approximately one-tenth the level in the thymus. Results also indicate that residues present at the V alpha J alpha junction may be important in an early selection process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roth, M E -- Lacy, M J -- McNeil, L K -- Kranz, D M -- AI24635/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 9;241(4871):1354-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Illinois, Urbana 61801.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2970673" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Genes ; *Major Histocompatibility Complex ; Mice ; Mice, Inbred Strains ; Molecular Sequence Data ; Receptors, Antigen, T-Cell/*genetics ; Receptors, Antigen, T-Cell, alpha-beta ; Recombination, Genetic ; Spleen/physiology ; T-Lymphocytes/*physiology ; Thymus Gland/physiology ; Tissue Distribution
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  • 79
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    Imaging of phosphorescence: a novel method for measuring oxygen distribution in perfused tissue (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-09-23
    Description: The imaging of phosphorescence provides a method for monitoring oxygen distribution within the vascular system of intact tissues. Isolated rat lives were perfused through the portal vein with media containing palladium coproporphyrin, which phosphoresced and was used to image the liver at various perfusion rates. Because oxygen is a powerful quenching agent for phosphors, the transition from well-perfused liver to anoxia (no flow of oxygen) resulted in large increases of phosphorescence. During stepwise restoration of oxygen flow, the phosphorescence images showed marked heterogeneous patterns of tissue reoxygenation, which indicated that there were regional inequalities in oxygen delivery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rumsey, W L -- Vanderkooi, J M -- Wilson, D F -- GM 21524/GM/NIGMS NIH HHS/ -- GM 36393/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 23;241(4873):1649-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia 19104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3420417" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Coproporphyrins ; Liver Circulation ; *Luminescence ; Male ; Oxygen/*analysis ; Palladium ; Perfusion ; Rats ; Rats, Inbred Strains
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  • 80
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    Marine mammals join the Navy (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morrison, D C -- New York, N.Y. -- Science. 1988 Dec 16;242(4885):1503-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201237" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Welfare ; Animals ; *Dolphins ; *Military Science ; *Pinnipedia ; *Seals, Earless ; United States
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  • 81
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    Salivary gland lysates from the sand fly Lutzomyia longipalpis enhance Leishmania infectivity (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-03-11
    Description: Leishmaniasis is a parasitic disease transmitted by phlebotomine sand flies. The role of sand fly saliva in transmission of the disease was investigated by injecting mice with Leishmania major parasites in the presence of homogenized salivary glands from Lutzomyia longipalpis. This procedure resulted in cutaneous lesions of Leishmania major that were routinely five to ten times as large and contained as much as 5000 times as many parasites as controls. With inocula consisting of low numbers of Leishmania major, parasites were detected at the site of injection only when the inoculum also contained salivary gland material. This enhancing effect of sand fly salivary glands on cutaneous leishmaniasis occurred with as little as 10 percent of the contents of one salivary gland of one fly. Material obtained from other bloodsucking arthropods could not mediate the phenomenon.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Titus, R G -- Ribeiro, J M -- 1 R29 AI24511/AI/NIAID NIH HHS/ -- 5 P01 AI22794/AI/NIAID NIH HHS/ -- AI18694 0481/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 Mar 11;239(4845):1306-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Rheumatology and Immunology, Brigham and Women's Hospital, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3344436" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arthropods ; *Diptera ; Leishmania tropica/*pathogenicity ; Leishmaniasis/*physiopathology ; Mice ; Mice, Inbred CBA ; Salivary Glands ; Species Specificity ; Tissue Extracts/*pharmacology
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  • 82
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    The coupling of neurotransmitter receptors to ion channels in the brain (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-07-29
    Description: Recent studies on the action of neurotransmitters on hippocampal pyramidal cells indicate that different neurotransmitter receptors that use either the same or different coupling mechanisms converge onto the same ion channel. Conversely, virtually all of the neurotransmitters act on at least two distinct receptor subtypes coupled to different ion channels on the same cell. The existence of both convergence and divergence in the action of neurotransmitters results in a remarkable diversity in neuronal signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nicoll, R A -- MH 0437/MH/NIMH NIH HHS/ -- MH 38256/MH/NIMH NIH HHS/ -- NS 24205/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 29;241(4865):545-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology School of Medicine, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2456612" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*physiology ; Calcium/physiology ; GTP-Binding Proteins/physiology ; Ion Channels/*physiology ; Neurons/physiology ; Neurotransmitter Agents/*physiology ; Receptors, Neurotransmitter/*physiology ; *Synaptic Transmission
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  • 83
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    Lineage-specific development of calcium currents during embryogenesis (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-12-16
    Description: The development of electrophysiological properties of isolated, identified ascidian blastomeres was followed from the fertilized egg to the neurula, and the stage at which cells of different lineages first express different functional ion channel populations was determined. Little has been known about such events because of the difficulties of making voltage-clamp recordings from small embryonic cells and of identifying their developmental fates in dissociated preparations. The problem of small cell size was circumvented by using the whole-cell patch clamp, and identification was facilitated by the use of a species of ascidian, Boltenia villosa, in which endogenous pigment marks cells of specific developmental fates. Within approximately 3 hours after gastrulation, muscle-lineage blastomeres in these embryos developed a voltage-dependent calcium current while surrounding blastomeres of other lineages did not. At about the same time, all cells developed delayed outward potassium currents and lost the inwardly rectifying potassium currents present at earlier stages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simoncini, L -- Block, M L -- Moody, W J -- HD 17486/HD/NICHD NIH HHS/ -- NS07775/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 16;242(4885):1572-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Washington, Seattle 98195.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2849207" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium Channels/*physiology ; Electric Conductivity ; Embryo, Nonmammalian/physiology ; Gastrula/physiology ; Muscles/embryology/physiology ; Potassium Channels/physiology ; Urochordata/*embryology
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  • 84
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    Two mechanisms for the extinction of gene expression in hybrid cells (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-09-02
    Description: When two different mammalian cell types are fused to generate a stable hybrid cell line, genes that are active in only one of the parents are frequently shut off, a phenomenon called extinction. In this study two distinct, complementary mechanisms for such extinction of growth hormone gene expression were identified. In hybrids formed by fusing fibroblasts to pituitary cells, pituitary-specific proteins that bind to the growth hormone promoter were absent. In addition, a negative regulatory element located near the rat growth hormone promoter was specifically activated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tripputi, P -- Guerin, S L -- Moore, D D -- New York, N.Y. -- Science. 1988 Sep 2;241(4870):1205-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Massachusetts General Hospital, Boston.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2842865" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyltransferases/genetics ; Animals ; Avian Sarcoma Viruses/genetics ; Chloramphenicol O-Acetyltransferase ; Enhancer Elements, Genetic ; Fibroblasts/metabolism ; *Gene Expression Regulation ; Growth Hormone/*genetics ; Herpesviridae/genetics ; Hybrid Cells/*metabolism ; Hypoxanthine Phosphoribosyltransferase/genetics ; L Cells (Cell Line) ; Mice ; Pituitary Gland/metabolism ; Plasmids ; Promoter Regions, Genetic ; Rats ; Thymidine Kinase/genetics ; Transfection
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  • 85
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    Newly identified brain potassium channels gated by the guanine nucleotide binding protein Go (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-12-09
    Description: Potassium channels in neurons are linked by guanine nucleotide binding (G) proteins to numerous neurotransmitter receptors. The ability of Go, the predominant G protein in the brain, to stimulate potassium channels was tested in cell-free membrane patches of hippocampal pyramidal neurons. Four distinct types of potassium channels, which were otherwise quiescent, were activated by both isolated brain G0 and recombinant Go alpha. Hence brain Go can couple diverse brain potassium channels to neurotransmitter receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉VanDongen, A M -- Codina, J -- Olate, J -- Mattera, R -- Joho, R -- Birnbaumer, L -- Brown, A M -- DK-19318/DK/NIDDK NIH HHS/ -- HL-31154/HL/NHLBI NIH HHS/ -- HL-37044/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1433-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Molecular Biophysics, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3144040" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Imidodiphosphate/pharmacology ; Animals ; Cattle ; Electric Conductivity ; GTP-Binding Proteins/*pharmacology ; Hippocampus/*physiology ; In Vitro Techniques ; Kinetics ; Macromolecular Substances ; Membrane Potentials/drug effects ; Potassium Channels/drug effects/*physiology ; Pyramidal Tracts/physiology ; Rats ; Recombinant Proteins/*pharmacology
    Print ISSN: 0036-8075
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  • 86
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    Reconstitution and phosphorylation of chloride channels from airway epithelium membranes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-09
    Description: Airway epithelial chloride secretion is controlled by the apical-membrane chloride permeability. Purified apical-membrane vesicles from bovine tracheal epithelium have now been shown to contain functional chloride channels by using the planar-bilayer technique. Three types of chloride channels were observed; a voltage-dependent, calcium-independent, 71-picoSiemen (in 150 mM NaCl) channel accounted for more than 80 percent of the vesicular chloride conductance and was under strict control of phosphorylation. The channel underwent a fast rundown in less than 2 to 3 minutes of recording, and reactivation required in situ exposure to a phosphorylating "cocktail" containing the catalytic subunit of the adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase. Mean open time and open probability were increased after phosphorylation, whereas slope conductance remained unchanged. Thus, metabolic control of tracheal chloride single channels can now be studied in vitro.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Valdivia, H H -- Dubinsky, W P -- Coronado, R -- DK 38518/DK/NIDDK NIH HHS/ -- GM 36852/GM/NIGMS NIH HHS/ -- HL 37044/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1441-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Molecular Biophysics, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2462280" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cattle ; Cell Membrane/physiology ; Chloride Channels ; Chlorides/isolation & purification/metabolism/*physiology ; Electric Conductivity ; Ion Channels/*physiology ; Membrane Potentials ; Membrane Proteins/isolation & purification/metabolism/*physiology ; Phosphorylation ; Trachea/*physiology
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  • 87
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    Nuclear factors in B lymphoma enhance splicing of mouse membrane-bound mu mRNA in Xenopus oocytes (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-01-29
    Description: Regulation of the synthesis of membrane-bound and secreted immunoglobulin mu heavy chains at the level of RNA processing is an important element for B cell development. The precursor mu RNA is either polyadenylated at the upstream poly(A) site (for the secreted form) or spliced (for the membrane-bound form) in a mutually exclusive manner. When the mouse mu gene linked to the SV40/HSV-TK hybrid promoter was microinjected into Xenopus oocytes, the mu messenger RNA (mRNA) was altered by coinjection of nuclei of mouse surface IgM-bearing B-lymphoma cells to include the synthesis of the membrane-bound form. An increase in the membrane-bound form was not observed when nuclei of IgM-secreting hybridoma cells or fibroblast cells were coinjected. Deletion of the upstream poly(A) site did not eliminate the effect of B-lymphoma nuclei suggesting that membrane-specific splicing is stimulated. Further, splicing of other mu gene introns was not affected by coinjection of B-lymphoma nuclei. These results suggest that mature B cells contain one or more transacting nuclear factors that stimulate splicing specific for membrane-bound mu mRNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsurushita, N -- Ho, L -- Korn, L J -- AI21298/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 29;239(4839):494-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Stanford University School of Medicine, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3124268" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/immunology/ultrastructure ; Cell Membrane/metabolism ; Cell Nucleus/*physiology ; DNA, Recombinant ; Female ; Hybridomas/ultrastructure ; Immunoglobulin M/genetics ; Immunoglobulin mu-Chains/*genetics ; Introns ; Lymphoma/*immunology/ultrastructure ; Mice ; Microinjections ; Nuclear Transfer Techniques ; Oocytes/*metabolism ; Plasmids ; Promoter Regions, Genetic ; *RNA Splicing ; RNA, Messenger/*genetics ; Tumor Cells, Cultured ; Xenopus
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  • 88
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    Retroviruses (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-10
    Description: First brought to scientific attention as infectious cancer-causing agents nearly 80 years ago, retroviruses are popular in contemporary biology for many reasons. (i) The virus life cycle includes several events--in particular, reverse transcription of the viral RNA genome into DNA, orderly integration of viral DNA into host chromosomes, and utilization of host mechanisms for gene expression in response to viral signals--which are broadly informative about eukaryotic cells and viruses. (ii) Retroviral oncogenesis usually depends on transduction or insertional activation of cellular genes, and isolation of those genes has provided the scientific community with many of the molecular components now implicated in the control of normal growth and in human cancer. (iii) Retroviruses include many important veterinary pathogens and two recently discovered human pathogens, the causative agents of the acquired immunodeficiency syndrome (AIDS) and adult T cell leukemia/lymphoma. (iv) Retroviruses are genetic vectors in nature and can be modified to serve as genetic vectors for both experimental and therapeutic purposes. (v) Insertion of retroviral DNA into host chromosomes can be used to mark cell lineages and to make developmental mutants. Progress in these and other areas of retrovirus-related biology has been enormous during the past two decades, but many practical and theoretical problems remain to be solved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Varmus, H -- New York, N.Y. -- Science. 1988 Jun 10;240(4858):1427-35.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, School of Medicine, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3287617" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Genes, Viral ; Humans ; Models, Biological ; *Research Design ; *Retroviridae/genetics/pathogenicity
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  • 89
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    Identification of an intracellular peptide segment involved in sodium channel inactivation (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-23
    Description: Antibodies directed against a conserved intracellular segment of the sodium channel alpha subunit slow the inactivation of sodium channels in rat muscle cells. Of four site-directed antibodies tested, only antibodies against the short intracellular segment between homologous transmembrane domains III and IV slowed inactivation, and their effects were blocked by the corresponding peptide antigen. No effects on the voltage dependence of sodium channel activation or of steady-state inactivation were observed, but the rate of onset of the antibody effect and the extent of slowing of inactivation were voltage-dependent. Antibody binding was more rapid at negative potentials, at which sodium channels are not inactivated; antibody-induced slowing of inactivation was greater during depolarizations to more positive membrane potentials. The peptide segment recognized by this antibody appears to participate directly in rapid sodium channel inactivation during large depolarizations and to undergo a conformational change that reduces its accessibility to antibodies as the channel inactivates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vassilev, P M -- Scheuer, T -- Catterall, W A -- NS 15751/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 23;241(4873):1658-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Washington, School of Medicine, Seattle 98195.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2458625" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies ; Cytoplasm/analysis ; In Vitro Techniques ; Ion Channels/*metabolism ; Membrane Potentials ; Molecular Sequence Data ; Peptides/*metabolism ; Rats ; Sodium/*metabolism
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 90
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    Reshaping human antibodies: grafting an antilysozyme activity (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-03-25
    Description: The production of therapeutic human monoclonal antibodies by hybridoma technology has proved difficult, and this has prompted the "humanizing" of mouse monoclonal antibodies by recombinant DNA techniques. It was shown previously that the binding site for a small hapten could be grafted from the heavy-chain variable domain of a mouse antibody to that of a human myeloma protein by transplanting the hypervariable loops. It is now shown that a large binding site for a protein antigen (lysozyme) can also be transplanted from mouse to human heavy chain. The success of such constructions may be facilitated by an induced-fit mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verhoeyen, M -- Milstein, C -- Winter, G -- New York, N.Y. -- Science. 1988 Mar 25;239(4847):1534-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Laboratory of Molecular Biology, Cambridge, England.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2451287" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibodies, Monoclonal/genetics/immunology ; Base Sequence ; Binding Sites, Antibody ; Binding, Competitive ; Cloning, Molecular ; DNA, Recombinant ; Epitopes/immunology ; Humans ; Immunoglobulin G/genetics/immunology ; Immunoglobulin Variable Region/genetics ; Mice ; Molecular Sequence Data ; Muramidase/*immunology ; Plasmids ; Recombinant Proteins ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 91
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    Protein translocation across membranes (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-09-09
    Description: Many newly synthesized proteins must be translocated across a membrane to reach their final destinations. Translocation requires a signal on the protein itself, a loose conformation of the protein, energy, and receptor-like components in the cytosol and on the target membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verner, K -- Schatz, G -- CBY-1 1 R01 GM37803-01/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 9;241(4871):1307-13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2842866" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport ; Cell Compartmentation ; Cell Membrane/*metabolism ; Endopeptidases/physiology ; Intracellular Membranes/*metabolism ; *Membrane Proteins ; Protein Biosynthesis ; Protein Processing, Post-Translational ; Protein Sorting Signals/physiology ; Proteins/*metabolism ; Receptors, Cell Surface/physiology ; *Serine Endopeptidases
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 92
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    Game depletion hypothesis of amazonian adaptation: data from a native community (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-03-25
    Description: The low population densities and impermanent settlements of Amazonian Indians are often interpreted as adaptations to a fauna that offers limited protein resources and is rapidly depleted by hunting. Data spanning the 10-year life cycle of one northwestern Amazonian settlement show that variations in hunt yields result from temporal variations in peccary (Tayassu pecari and T. tajacu) kills that appear extrinsic to native population size. After 10 years, hunting success remained high and the kill rates for most prey did not suggest depletion. An array of environmental factors accounts for the incipient settlement relocation observed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vickers, W T -- 1FOL MH58552-01/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1988 Mar 25;239(4847):1521-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anthropology and Sociology, Florida International University, Miami 33199.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3353699" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cultural Characteristics ; *Culture ; Ecuador ; *Food Supply ; Humans ; *Indians, South American ; Meat ; Population Density
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 93
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    Modulation of acetylcholine receptor desensitization by forskolin is independent of cAMP (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-06-17
    Description: Biochemical and electrophysiological studies suggest that adenosine 3',5'-monophosphate (cAMP)-dependent phosphorylation of the nicotinic acetylcholine receptor channel is functionally significant because it modifies the receptor's rate of desensitization to acetylcholine. In studies that support this conclusion researchers have used forskolin to stimulate cAMP-dependent phosphorylation in intact muscle. It is now shown that although forskolin facilitated desensitization in voltage-clamped rat muscle, this effect was not correlated with the abilities of forskolin and forskolin analogs to activate adenylate cyclase or phosphorylate the receptor. Furthermore, elevation of intracellular cAMP or addition of the catalytic subunit of A-kinase failed to alter desensitization. Therefore, in intact skeletal muscle, cAMP-dependent phosphorylation does not modulate desensitization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wagoner, P K -- Pallotta, B S -- GM32211/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 17;240(4859):1655-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pharmacology, Glaxo Research Laboratories, Chapel Hill, NC 27599.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2454507" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-3-isobutylxanthine/pharmacology ; Acetylcholine/pharmacology ; Adenylyl Cyclases/metabolism ; Animals ; Bucladesine/pharmacology ; Colforsin/*pharmacology ; Cyclic AMP/analogs & derivatives/*pharmacology ; Electric Conductivity ; Enzyme Activation/drug effects ; Kinetics ; Muscles/*metabolism ; Phosphorylation ; Rats ; Receptors, Cholinergic/drug effects/*physiology ; Torpedo/metabolism
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 94
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    Functional expression of a new pharmacological subtype of brain nicotinic acetylcholine receptor (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-15
    Description: A new type of agonist-binding subunit of rat neuronal nicotinic acetylcholine receptors (nAChRs) was identified. Rat genomic DNA and complementary DNA encoding this subunit (alpha 2) were cloned and analyzed. Complementary DNA expression studies in Xenopus oocytes revealed that the injection of messenger RNAs (mRNAs) for alpha 2 and beta 2 (a neuronal nAChR subunit) led to the generation of a functional nAChR. In contrast to the other known neuronal nAChRs, the receptor produced by the injection of alpha 2 and beta 2 mRNAs was resistant to the alpha-neurotoxin Bgt3.1. In situ hybridization histochemistry showed that alpha 2 mRNA was expressed in a small number of regions, in contrast to the wide distribution of the other known agonist-binding subunits (alpha 3 and alpha 4) mRNAs. These results demonstrate that the alpha 2 subunit differs from other known agonist-binding alpha-subunits of nAChRs in its distribution in the brain and in its pharmacology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wada, K -- Ballivet, M -- Boulter, J -- Connolly, J -- Wada, E -- Deneris, E S -- Swanson, L W -- Heinemann, S -- Patrick, J -- New York, N.Y. -- Science. 1988 Apr 15;240(4850):330-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Salk Institute for Biological Studies, San Diego, CA 92138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2832952" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Brain/*metabolism ; DNA Restriction Enzymes ; Female ; *Genes ; Molecular Sequence Data ; Neurons/metabolism ; Nucleotide Mapping ; Oocytes/metabolism ; Rats ; Receptors, Nicotinic/*genetics/metabolism ; Transcription, Genetic ; Xenopus laevis
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  • 95
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    Guanylate cyclase and the adrenal natriuretic factor receptor (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-05-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Waldman, S A -- Leitman, D C -- Andresen, J -- Murad, F -- New York, N.Y. -- Science. 1988 May 6;240(4853):805-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2896389" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Electrophoresis, Polyacrylamide Gel ; Guanylate Cyclase/*isolation & purification ; Immunoassay ; Receptors, Atrial Natriuretic Factor ; Receptors, Cell Surface/*isolation & purification
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 96
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    Aggregation of lysine-containing zeins into protein bodies in Xenopus oocytes (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-29
    Description: Zeins, the storage proteins of maize, are totally lacking in the essential amino acids lysine and tryptophan. Lysine codons and lysine- and tryptophan-encoding oligonucleotides were introduced at several positions into a 19-kilodalton zein complementary DNA by oligonucleotide-mediated mutagenesis. A 450-base pair open reading frame from a simian virus 40 (SV40) coat protein was also engineered into the zein coding region. Messenger RNAs for the modified zeins were synthesized in vitro with an SP6 RNA polymerase system and injected into Xenopus laevis oocytes. The modifications did not affect the translation, signal peptide cleavage, or stability of the zeins. The ability of the modified zeins to assemble into structures similar to maize protein bodies was assayed by two criteria: assembly into membrane-bound vesicles resistant to exogenously added protease, and ability to self-aggregate into dense structures. All of the modified zeins were membrane-bound; only the one containing a 17-kilodalton SV40 protein fragment was unable to aggregate. These findings suggest that it may be possible to create high-lysine corn by genetic engineering.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wallace, J C -- Galili, G -- Kawata, E E -- Cuellar, R E -- Shotwell, M A -- Larkins, B A -- New York, N.Y. -- Science. 1988 Apr 29;240(4852):662-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2834822" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Membrane/metabolism ; DNA/genetics ; DNA, Recombinant ; Female ; Genetic Engineering ; *Lysine/genetics ; Macromolecular Substances ; Molecular Sequence Data ; Mutation ; Oocytes/*metabolism ; Peptide Hydrolases/metabolism ; RNA, Messenger/genetics ; Simian virus 40/genetics ; Xenopus laevis ; Zea mays ; Zein/genetics/*metabolism
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 97
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    Clonally related cortical cells show several migration patterns (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-09
    Description: The mammalian cerebral cortex is organized into columns of cells with common functional properties. During embryogenesis, cortical neurons are formed deep, near the lateral ventricles, and migrate radially to their final position. This observation led to the suggestion that the cortex consists of radial, ontogenetic units of clonally related neurons. In the experiments reported here, this hypothesis was tested by studying cell lineage in the rat cortex with a retroviral vector carrying the Escherichia coli beta-galactosidase gene, which can be easily visualized. Labeled, clonally related cortical neurons did not occur in simple columnar arrays. Instead, clonally related neurons entered several different radial columns, apparently by migrating along different radial glial fibers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walsh, C -- Cepko, C L -- EY07331-01/EY/NEI NIH HHS/ -- R01 NS 23021-01/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Sep 9;241(4871):1342-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3137660" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Movement ; Cerebral Cortex/cytology/*embryology ; Clone Cells ; Neuroglia/physiology ; Rats ; Transfection ; beta-Galactosidase/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 98
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    Rift Valley fever rears its head (1988)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1988-06-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walsh, J -- New York, N.Y. -- Science. 1988 Jun 10;240(4858):1397-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3375824" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Humans ; Mauritania ; Rift Valley Fever/*epidemiology/transmission
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 99
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    Mitochondrial DNA mutation associated with Leber's hereditary optic neuropathy (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-09
    Description: Leber's hereditary optic neuropathy is a maternally inherited disease resulting in optic nerve degeneration and cardiac dysrhythmia. A mitochondrial DNA replacement mutation was identified that correlated with this disease in multiple families. This mutation converted a highly conserved arginine to a histidine at codon 340 in the NADH dehydrogenase subunit 4 gene and eliminated an Sfa NI site, thus providing a simple diagnostic test. This finding demonstrated that a nucleotide change in a mitochondrial DNA energy production gene can result in a neurological disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wallace, D C -- Singh, G -- Lott, M T -- Hodge, J A -- Schurr, T G -- Lezza, A M -- Elsas, L J 2nd -- Nikoskelainen, E K -- NS21328/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1427-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201231" target="_blank"〉PubMed〈/a〉
    Keywords: African Continental Ancestry Group ; Animals ; Arginine ; Cytochrome Reductases/*genetics ; DNA, Mitochondrial/*genetics ; European Continental Ancestry Group ; Female ; *Genes ; Georgia ; Hereditary Sensory and Motor Neuropathy/*genetics ; Histidine ; Humans ; Macromolecular Substances ; Male ; *Mutation ; NADH Dehydrogenase/*genetics ; Optic Atrophies, Hereditary/*genetics ; Pedigree ; Reference Values
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 100
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    Regulation of a heart potassium channel by protein kinase A and C (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-10-07
    Description: The enzymes adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase (protein kinase A) and protein kinase C regulate the activity of a diverse group of cellular proteins including membrane ion channel proteins. When protein kinase A was stimulated in cardiac ventricular myocytes with the membrane-soluble cAMP analog 8-chlorphenylthio cAMP (8-CPT cAMP), the amplitude of the delayed-rectifier potassium current (IK) doubled when recorded at 32 degrees C but was not affected at 22 degrees C. In contrast, modulation of the calcium current (ICa) by 8-CPT cAMP was independent of temperature with similar increases in ICa occurring at both temperatures. Stimulation of protein kinase C by phorbol 12,13-dibutyrate also enhanced IK in a temperature-dependent manner but failed to increase ICa at either temperature. Thus, cardiac delayed-rectifier potassium but not calcium channels are regulated by two distinct protein kinases in a similar temperature-dependent fashion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walsh, K B -- Kass, R S -- New York, N.Y. -- Science. 1988 Oct 7;242(4875):67-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Rochester, School of Medicine and Dentistry, NY 14642.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2845575" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cyclic AMP/*analogs & derivatives/pharmacology ; Guinea Pigs ; Heart/*physiology ; Homeostasis ; In Vitro Techniques ; Kinetics ; Membrane Potentials ; Potassium Channels/*physiology ; Protein Kinase C/*metabolism ; Protein Kinases/*metabolism ; Thermodynamics ; Thionucleotides/*pharmacology ; Ventricular Function
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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