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  • 2005-2009  (156)
  • 1970-1974  (232)
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  • 1
    Online-Ressource
    Online-Ressource
    New York :Council on Foreign Relations,
    Schlagwort(e): Climatic changes - Government policy - United States. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: Latin America has never mattered more for the United States. The region is the largest foreign supplier of oil to the United States and a strong partner in the development of alternative fuels. It is the United States' fastest-growing trading partner, as.
    Materialart: Online-Ressource
    Seiten: 1 online resource (142 pages)
    Ausgabe: 1st ed.
    ISBN: 9780876094129
    Serie: Independent Task Force Report ; v.61
    DDC: 551.6
    Sprache: Englisch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Newark :John Wiley & Sons, Incorporated,
    Schlagwort(e): Organic compounds. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (614 pages)
    Ausgabe: 1st ed.
    ISBN: 9783527609901
    Sprache: Englisch
    Anmerkung: Intro -- Functional Organic Materials -- Contents -- Preface -- List of Contributors -- Part I 3-D Carbon-rich π-Systems - Nanotubes and Segments -- 1 Functionalization of Carbon Nanotubes -- 1.1 Introduction to Carbon Nanotubes - A New Carbon Allotrope -- 1.2 Functionalization of Carbon Nanotubes -- 1.3 Covalent Functionalization -- 1.3.1 Halogenation of Carbon Nanotubes -- 1.3.1.1 Fluorination of Carbon Nanotubes -- 1.3.1.2 Chlorination of Carbon Nanotubes -- 1.3.1.3 Bromination of MWCNTs -- 1.3.1.4 Chemical Derivatization of "Fluoronanotubes" -- 1.3.2 Oxidation of CNTs - Oxidative Purification -- 1.3.2.1 Carboxylation of CNTs -- 1.3.2.2 Defect Functionalization - Transformation of Carboxylic Functions -- 1.3.3 Hydrogenation of Carbon Nanotubes -- 1.3.4 Addition of Radicals -- 1.3.5 Addition of Nucleophilic Carbenes -- 1.3.6 Sidewall Functionalization Through Electrophilic Addition -- 1.3.7 Functionalization Through Cycloadditions -- 1.3.7.1 Addition of Carbenes -- 1.3.7.2 Addition of Nitrenes -- 1.3.7.3 Nucleophilic Cyclopropanation - Bingel Reaction -- 1.3.7.4 Azomethine Ylides -- 1.3.7.5 [4+2]-Cycloaddition - Diels-Alder Reaction -- 1.3.7.6 Sidewall Osmylation of Individual SWCNTs -- 1.3.8 Aryl Diazonium Chemistry - Electrochemical Modification of Nanotubes -- 1.3.9 Reductive Alkylation and Arylation of Carbon Nanotubes -- 1.3.10 Addition of Carbanions - Reactions with Alkyllithium -- 1.3.11 Covalent Functionalization by Polymerization - "Grafting To" and "Grafting From" -- 1.4 Noncovalent Exohedral Functionalization - Functionalization with Biomolecules -- 1.5 Endohedral Functionalization -- 1.6 Conclusions -- 1.7 Experimental -- References -- 2 Cyclophenacene Cut Out of Fullerene -- 2.1 Introduction -- 2.2 Synthesis of [10]Cyclophenacene π-Conjugated Systems from [60]Fullerene -- 2.2.1 Synthetic Strategy. , 2.2.2 Synthesis and Characterization of [10]Cyclophenacenes -- 2.2.3 Structural Studies and Aromaticity of [10]Cyclophenacene -- 2.2.4 Synthesis of Dibenzo-fused Corannulenes -- 2.2.5 Absorption and Emission of [10]Cyclophenacenes and Dibenzo Fused Corannulenes -- 2.3 Conclusion -- 2.4 Experimental -- References -- Part II Strategic Advances in Chromophore and Materials Synthesis -- 3 Cruciform π-Conjugated Oligomers -- 3.1 Introduction -- 3.2 Oligomers with a Tetrahedral Core Unit -- 3.3 Oligomers with a Tetrasubstituted Benzene Core -- 3.4 Oligomers with a Tetrasubstituted Biaryl Core -- 3.5 Conclusion -- 3.6 Experimental -- Acknowledgments -- References -- 4 Design of π-Conjugated Systems Using Organophosphorus Building Blocks -- 4.1 Introduction -- 4.2 Phosphole-containing π-Conjugated Systems -- 4.2.1 α,α´-Oligo(phosphole)s -- 4.2.2 Derivatives Based on 1,1'-Biphosphole Units -- 4.2.3 Mixed Oligomers Based on Phospholes with Other (Hetero)aromatics -- 4.2.4 Mixed Oligomers Based on Biphospholes with other (Hetero)aromatics -- 4.2.5 Mixed Oligomers Based on Phospholes with Ethenyl or Ethynyl Units -- 4.2.6 Polymers Incorporating Phospholes -- 4.2.7 Mixed Oligomers and Polymers Based on Dibenzophosphole or Dithienophosphole -- 4.3 Phosphine-containing π-Conjugated Systems -- 4.3.1 Polymers Based on p-Phenylenephosphine Units -- 4.3.2 Oligomers Based on Phosphine-Ethynyl Units -- 4.3.3 Mixed Derivatives Based on Arylphosphino Units -- 4.4 Phosphaalkene- and Diphosphene-containing π-Conjugated Systems -- 4.5 Conclusion -- 4.6 Selected Experimental Procedures -- References -- 5 Diversity-oriented Synthesis of Chromophores by Combinatorial Strategies and Multi-component Reactions -- 5.1 Introduction -- 5.2 Combinatorial Syntheses of Chromophores -- 5.2.1 Combinatorial Azo Coupling -- 5.2.2 Combinatorial Condensation Reactions. , 5.2.3 Combinatorial Cross-coupling Reactions -- 5.2.4 Combinatorial Coordination Chemistry -- 5.3 Novel Multi-component Syntheses of Chromophores -- 5.3.1 Multi-component Condensation Reactions -- 5.3.2 Multi-component Cross-coupling Reactions -- 5.4 Conclusion and Outlook -- 5.5 Experimental Procedures -- References -- 6 High-yield Synthesis of Shape-persistent Phenylene-Ethynylene Macrocycles -- 6.1 Introduction -- 6.2 Synthesis -- 6.2.1 General -- 6.2.2 The Kinetic Approach -- 6.2.2.1 Statistical Reactions -- 6.2.2.2 Template-controlled Cyclizations -- 6.2.3 The Thermodynamic Approach -- 6.3 Conclusion -- 6.4 Experimental Procedures [37] -- References -- 7 Functional Materials via Multiple Noncovalent Interactions -- 7.1 Introduction -- 7.2 Biologically Inspired Materials via Multi-step Self-assembly -- 7.3 Small Molecule-based Multi-step Self-assembly -- 7.4 Polymer-based Self-assembly -- 7.4.1 Main-chain Self-assembly -- 7.4.2 Side-chain Self-assembly -- 7.4.3 Macroscopic Self-assembly -- 7.5 Conclusion and Outlook -- References -- Part III Molecular Muscles, Switches and Electronics -- 8 Molecular Motors and Muscles -- 8.1 Introduction -- 8.2 Mechanically Interlocked Molecules as Artificial Molecular Machines -- 8.3 Chemically Induced Switching of the Bistable Rotaxanes -- 8.3.1 A Bistable [2]Rotaxane Driven by Acid-Base Chemistry -- 8.3.2 A pH-driven Molecular Elevator -- 8.3.3 A Molecular Muscle Powered by Metal Ion Exchange -- 8.3.4 Redox and Chemically Controlled Molecular Switches and Muscles -- 8.3.4.1 Solution-phase Switching -- 8.3.4.2 Condensed-phase Switching -- 8.3.4.3 A Solid-state Nanomechanical Device -- 8.4 Electrochemically Controllable Bistable Rotaxanes -- 8.4.1 A Benzidine/Biphenol-based Molecular Switch -- 8.4.2 Electrochemically Controlled Switching of TTF/DNP-based [2]Rotaxanes -- 8.4.2.1 Solution-phase Switching. , 8.4.2.2 Metastability of a Redox-driven [2]Rotaxane SAM on Gold Surfaces -- 8.4.2.3 A TTF/DNP [2]Rotaxane-based Electrochromic Device -- 8.4.2.4 A Redox-driven [2]Rotaxane-based Molecular Switch Tunnel Junctions (MSTJs) Device -- 8.4.3 A Redox and Chemically Controllable Bistable Neutral [2]Rotaxane -- 8.4.3.1 Electrochemical Switching -- 8.4.3.2 Chemical Switching Induced by Lithium Ion (Li(+)) -- 8.5 Photochemically Powered Molecular Switches -- 8.5.1 Molecular Switching Caused by Photoisomerization -- 8.5.2 PET-induced Switching of an H-bonded Molecular Motor -- 8.5.3 MLCT-induced Switching of a Metal Ion-based Molecular Motor -- 8.5.4 A Photo-driven Molecular Abacus -- 8.6 Conclusions -- Acknowledgments -- References -- 9 Diarylethene as a Photoswitching Unit of Intramolecular Magnetic Interaction -- 9.1 Introduction -- 9.2 Photochromic Spin Coupler -- 9.3 Synthesis of Diarylethene Biradicals -- 9.4 Photoswitching Using Bis(3-thienyl)ethene -- 9.5 Reversed Photoswitching Using Bis(2-thienyl)ethene -- 9.6 Photoswitching Using an Array of Photochromic Molecules -- 9.7 Development of a New Switching Unit -- 9.8 Conclusions -- 9.9 Experimental Procedures -- Acknowledgments -- References -- 10 Thiol End-capped Molecules for Molecular Electronics: Synthetic Methods, Molecular Junctions and Structure-Property Relationships -- 10.1 Introduction -- 10.2 Synthetic Procedures -- 10.2.1 Protecting Groups for Arylthiols -- 10.2.1.1 Synthesis of Arylthiol "Alligator Clips" -- 10.2.2 One-terminal Wires -- 10.2.3 Two-terminal Wires -- 10.2.4 Three-terminal Wires -- 10.2.5 Four-terminal Wires -- 10.2.6 Caltrops -- 10.3 Electron Transport in Two- and Three-terminal Molecular Devices -- 10.3.1 Molecular Junctions -- 10.3.1.1 Scanning Tunneling-based Molecular Junctions -- 10.3.1.2 Conducting-probe Atomic Force Microscopy. , 10.3.1.3 Solution-phase Molecular STM Junctions -- 10.3.1.4 Break Junctions -- 10.3.1.5 Crossed Wires -- 10.3.1.6 Nanopore Junctions -- 10.3.1.7 Square-tip Junctions -- 10.3.1.8 Mercury Drop Junctions -- 10.3.1.9 Particle Junctions -- 10.3.1.10 Nanowire Junctions -- 10.3.1.11 Three-terminal Single-molecule Transistors -- 10.4 Summary and Outlook -- 10.5 Experimental -- References -- 11 Nonlinear Optical Properties of Organic Materials -- 11.1 Introduction to Nonlinear Optics -- 11.1.1 Introduction -- 11.1.2 Linear and Nonlinear Polarization -- 11.1.3 Second-order Nonlinear Optical Effects -- 11.1.4 Measurement Techniques for Second-order Properties, β and χ((2)) -- 11.1.5 Third-order Nonlinear Optical Effects -- 11.1.6 Measurement Techniques for 2PA Cross-section, δ -- 11.2 Second-order Chromophores for Electrooptic Applications -- 11.2.1 Design of Second-order Chromophores: the Two-level Model -- 11.2.2 Other Chromophore Designs -- 11.2.3 Other Considerations -- 11.2.4 High-performance Electooptic Poled-polymer Systems -- 11.3 Design and Application of Two-photon Absorbing Chromophores -- 11.3.1 Essential-state Models for Two-photon Cross-section -- 11.3.2 Chromophore Designs -- 11.3.3 Applications of Two-photon Absorption -- 11.4 Appendix: Units in NLO -- Acknowledgments -- References -- Part IV Electronic Interaction and Structure -- 12 Photoinduced Electron Transfer Processes in Synthetically Modified DNA -- 12.1 DNA as a Bioorganic Material for Electron Transport -- 12.2 Mechanism of Hole Transfer and Hole Hopping in DNA -- 12.3 Reductive Electron Transfer and Excess Electron Transport in DNA -- 12.3.1 Strategies for the Synthesis of DNA Donor-Acceptor Systems -- 12.3.2 Chromophore Functionalization of DNA Bases via Synthesis of DNA Building Blocks -- 12.3.3 DNA Base Modifications via a Solid-phase Synthetic Strategy. , 12.3.4 Chromophores as Artificial DNA Base Substitutes.
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  • 3
    Schlagwort(e): Hochschulschrift
    Materialart: Online-Ressource
    Seiten: 1 Online-Ressource (55 Seiten = 5 MB) , Illustrationen, Graphen
    Sprache: Deutsch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    Berlin Heidelberg : Springer-Verlag GmbH
    Schlagwort(e): Catalysis ; Chemistry, Organic ; Chemistry, inorganic ; Chemistry ; Aufsatzsammlung ; Tandem-Reaktion ; Übergangsmetallkomplexe ; Katalysator
    Beschreibung / Inhaltsverzeichnis: Klappentext: Transition metal-catalyzed cascade reactions are an elegant approach to complex molecular scaffolds. Besides their esthetics and increase in structural complexity, they have also become mechanistic challenges for the combination of organometallic elementary steps. As a consequence, cascade reactions have revolutionized synthetic strategies and conceptual thinking. The authors highlight cyclization via carbopalladation and acylpalladation and Heck-pericyclic sequences. They discuss p-allyl palladium-based cascade reactions, Michael-type additions as an entry to transition-metal-promoted cyclizative transformations, and sequential or consecutive palladium-catalyzed processes, and show Pauson-Khand cascades, metal-catalyzed cyclizations of acyclic precursors, as well as cascade and sequential ruthenium-catalyzed transformations. Therefore, the reader finds overview of an exciting and highly dynamic field of a new and innovative methodological concept.
    Materialart: Online-Ressource
    Seiten: Online-Ressource (VIII, 339 S.) , zahlr. graph. Darst.
    Ausgabe: Online-Ausg. 2006 Springer eBook Collection. Chemistry and Materials Science
    ISBN: 9783540329596
    Serie: Topics in organometallic chemistry 19
    DDC: 540
    RVK:
    Sprache: Englisch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg : Springer Berlin Heidelberg
    Schlagwort(e): Chemistry, inorganic ; Chemistry, Organic ; Catalysis ; Chemistry ; Aufsatzsammlung ; Tandem-Reaktion ; Übergangsmetallkomplexe ; Katalysator
    Materialart: Online-Ressource
    Seiten: Online-Ressource (IX, 339 p. Also available online, digital)
    ISBN: 9783540329596
    Serie: Topics in Organometallic Chemistry 19
    Sprache: Englisch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Schlagwort(e): Medicine ; Radiology, Medical ; Cardiology ; Clinical medicine ; Nephrology ; Oncology ; Medicine & Public Health ; Cardiology ; Clinical medicine ; Nephrology ; Oncology ; Radiology, Medical ; Medicine ; Tomography, X-Ray Computed methods ; Digestive System Diseases diagnosis ; Cardiovascular Diseases diagnosis ; Coronary Angiography methods ; Aufsatzsammlung ; Computertomografie ; Kontrastmittel
    Beschreibung / Inhaltsverzeichnis: Multidetector-row computed tomography (MDCT) has advanced the approach to diagnostic assessment of many pathologies and now plays an integral role in imaging of both abdominal and cardiovascular diseases. The possibility to acquire diagnostic images with shorter scan duration, longer scan ranges, and/or thinner sections, MDCT has facilitated the opening of new horizons, such as interventional MDCT and functional imaging in stroke and oncology. In addition, advanced postprocessing techniques now permit high quality volumetric imaging in combination with maximum intensity projections, volume rendering, curved planar reformations and multiplanar reconstructions. This volume gathers contributions by internationally renowned specialists in the field who, through presenting their clinical experience, provide a thorough overview not only of MDCT and its practical applications, but also of workflow management in everyday clinical practice. Focussing on scanning and contrast protocols, the current advantages and disadvantages of non-enhanced vs. enhanced MDCT are discussed, along with insights into likely future developments. The volume represents an up-to-date source of technical and practically-oriented clinical information which should prove of great benefit to all who wish to improve or consolidate their knowledge and expertise in MDCT.
    Materialart: Online-Ressource
    Seiten: Online-Ressource (X, 131 p, digital)
    ISBN: 9788847003637
    Serie: SpringerLink
    RVK:
    Sprache: Englisch
    Anmerkung: Includes bibliographical references , State of the art report , Introduction; MDCT: Technical Principles and Future Trends; Contrast Medium Administration and Scan Timing for MDCT; Introduction; Imaging Benign and Metastatic Liver Tumors with MDCT; MDCT of Primary Liver Malignancy; MDCT of the Pancreas; Abdominal Imaging: Use of High-Concentration Contrast Media; Introduction; Essentials of Contrast Medium Delivery for CT Angiography; Current and Future Indications of Cardiac MDCT; Abdominal Aorta, Renal Arteries and Run-Off Vessels; MDCT for Diagnosis of Pulmonary Embolism: Have We Reached Our Goal?; Introduction; Multislice CT: Interventional CT , Functional CT Imaging in Stroke and OncologyMDCT and Data Explosion: Current Technologies and Directions for Future Development in Managing the Information Overload; Late Adverse Events Following Administration of Iodinated Contrast Media: An Update
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  • 7
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg : Springer-Verlag Berlin Heidelberg
    Schlagwort(e): Medicine ; Radiology, Medical ; Interventional radiology ; Oncology ; Surgery ; Urology ; Medicine & Public Health ; Interventional radiology ; Oncology ; Radiology, Medical ; Surgery ; Urology ; Medicine ; Neoplasms therapy ; Catheter Ablation methods ; Laser Therapy methods ; Surgical Procedures, Minimally Invasive ; Aufsatzsammlung ; Krebs ; Ablation ; Interventionsradiologie
    Beschreibung / Inhaltsverzeichnis: This book encompasses the different technologies employed in thermal ablation, its indications and the results achieved in various clinical conditions. It clearly explains the basics of thermal ablative techniques. In the main part of the book, techniques of guiding the applicators to the target structures by use of different imaging tools are discussed. The book, written by acknowledged experts, has a lucid structure and excellent images.
    Materialart: Online-Ressource
    Seiten: Online-Ressource (digital)
    ISBN: 9783540682509
    Serie: Medical Radiology, Diagnostic Imaging
    RVK:
    Sprache: Englisch
    Anmerkung: Includes bibliographical references and index , Front Matter; Basic Principles in Oncology; Radiofrequency Ablation; Microwave Ablation; Laser Ablation; Locoregional Chemotherapy Including Perfusion; Transarterial Chemoembolization (TACE) in Primary and Secondary Liver Tumors; CT-Guided HDR Brachytherapy: Challenging the Limits of Thermal Ablation; Selective Internal Radiation Therapy; Therapy with Intra-arterial Iodine-131-Lipiodol in Inoperable Hepatocellular Carcinoma; Instillation of Alcohol; Instillation of Bone Cement; Transarterial Chemoembolization (TACE) and Combined Therapies; Percutaneous Alcohol Instillation , Radiofrequency Ablation (RFA)LITT-HCC; Radiofrequency Ablation (RFA); LITT; Symptomatic Hemangiomas, Adenomas; Radiofrequency Ablation (RFA); Radiofrequency Ablation (RFA); Laser-Induced Thermotherapy (LITT) in the Treatment of Lung Metastases; Radiofrequency Ablation in Bone Metastases; Head and Neck Lesions; Breast; Hepatocellular Carcinoma (HCC); Bone; Back Matter
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  • 8
    In: Royal Society (London), Proceedings of the Royal Society of London. Series B, Biological sciences, London : The Royal Society, 1905, 276(2009), 1672, Seite 3439-3446, 1471-2954
    In: volume:276
    In: year:2009
    In: number:1672
    In: pages:3439-3446
    Beschreibung / Inhaltsverzeichnis: Scaridae (parrotfishes) is a prominent clade of 96 species that shape coral reef communities worldwide through their actions as grazing herbivores. Phylogenetically nested within Labridae, the profound ecological impact and high species richness of parrotfishes suggest that their diversification and ecological success may be linked. Here, we ask whether parrotfish evolution is characterized by a significant burst of lineage diversification and whether parrotfish diversity is shaped more strongly by sexual selection or modifications of the feeding mechanism. We first examined scarid diversification within the greater context of labrid diversity. We used a supermatrix approach for 252 species to propose the most extensive phylogenetic hypothesis of Labridae to date, and time-calibrated the phylogeny with fossil and biogeographical data. Using divergence date estimates, we find that several parrotfish clades exhibit the highest diversification rates among all labrid lineages. Furthermore, we pinpoint a rate shift at the shared ancestor of Scarus and Chlorurus, a scarid subclade characterized by territorial behaviour and strong sexual dichromatism, suggesting that sexual selection was a major factor in parrotfish diversification. Modifications of the pharyngeal and oral jaws that happened earlier in parrotfish evolution may have contributed to this diversity by establishing parrotfishes as uniquely capable reef herbivores.
    Materialart: Online-Ressource
    Seiten: graph. Darst
    ISSN: 1471-2954
    Sprache: Englisch
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Schlagwort(e): Forschungsbericht
    Materialart: Buch
    Seiten: 33 S , graph. Darst
    Serie: IFM-GEOMAR-Report 17
    Sprache: Englisch
    Anmerkung: Auch als elektronisches Dokument vorh
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  • 10
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