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  • 2010-2014  (69)
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  • 1
    Keywords: Molecular orbitals. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (202 pages)
    Edition: 1st ed.
    ISBN: 9783642388095
    Series Statement: Advances in Atom and Single Molecule Machines Series
    Language: English
    Note: Intro -- Preface -- Contents -- Part I FEM -- 1 Observations of Individual Cu-Phthalocyanine Molecules Deposited on Nano-Tips in the Field Emission Microscope -- Abstract -- 1…Introduction -- 2…Experimental Setup and Molecule Images -- 3…Current Voltage Emission Characteristics Through the Molecule -- 4…Computer Simulation of the Molecule Adsorption on the Nano-Tip Apex -- 5…Conclusion -- References -- 2 High Voltage STM Imaging of Single Copper Phthalocyanine -- Abstract -- 1…Introduction -- 2…Experiments and Results -- 3…Interpretation -- 4…Conclusion -- Acknowledgments -- References -- Part II STEM -- 3 Motional Analysis of a Single Organic Molecule by TEM Using Nanocarbon Materials: Scope of Atomic Level Imaging and Spectroscopy -- Abstract -- 1…Organic Single Molecule Versus Organic Crystal -- 2…Putting Molecules Inside Carbon Nanotubes: Method -- 3…What Influences Molecular Motions? -- 4…Characterizing the Structure with Atomic Resolution -- 5…Conclusion -- Acknowledgments -- References -- Part III Photo-Emission (PE) -- 4 Imaging Orbitals by Ionization or Electron Attachment: The Role of Dyson Orbitals -- Abstract -- 1…Introduction -- 2…Dyson Orbitals in Pentacene -- 3…Dyson Orbitals and Super Atomic Molecular Orbital States in C60 -- 4…Time-Dependent Dyson Orbitals -- 5…Conclusions -- Acknowledgments -- References -- Part IV LT-UHV-STM -- 5 Mapping the Electronic Resonances of Single Molecule STM Tunnel Junctions -- Abstract -- 1…Introduction -- 2…Pentacene/Au(111) -- 3…Cu-Phthalocyanine/Au(111) -- 4…Hexabenzocoronene/Au(111) -- 5…Conclusion -- Acknowledgments -- References -- 6 Manipulation and Spectroscopy of Individual Phthalocyanine Molecules on InAs(111)A with a Low-Temperature Scanning Tunneling Microscope -- Abstract -- 1…Introduction -- 2…Results and Discussion -- 2.1 Experimental Details -- 2.2 The Substrate Surface: InAs(111)A. , 2.3 Naphthalocyanine Molecules on InAs(111)A -- 2.4 Free-Base Phthalocyanine Molecules on InAs(111)A -- 3…Conclusions -- Acknowledgments -- References -- 7 Electronic Structure and Properties of Graphen Nanoribbons: Zigzag and Armchair Edges -- Abstract -- 1…Introduction -- 2…Experiment and Results -- 3…dI/dV Spectroscopy -- 4…dI/dV Mapping -- 5…Conclusion -- Acknowledgments -- References -- 8 Imaging and Manipulation of Molecular Electronic States on Metal Surfaces with Scanning Tunneling Microscopy -- Abstract -- 1…Introduction -- 2…Formation of a Metal--Ligand Bond with Cu and PVBA -- 3…Actuated Transitory Metal--Ligand Bond as Tunable Electromechanical Switch -- 4…Summary -- Acknowledgments -- References -- 9 SPM Imaging of Trinaphthylene Molecular States on a Hydrogen Passivated Ge(001) Surface -- Abstract -- 1…Introduction -- 2…Ge(001) Surface Preparation and Molecule Deposition -- 3…Molecular State Imaging of Heptastarphene Molecules Anchored on the Ge(001):H Surface with LT-STM -- 4…3D Molecular State Probing with Simultaneous Tunneling Current and Force Imaging with a qPlus Sensor -- 5…Concluding Remarks -- Acknowledgments -- References -- Part V STM Theory and Image Interpretation -- 10 Simulations of Constant Current STM Images of Open-Shell Systems -- Abstract -- 1…Introduction -- 2…Simulation of Constant Current STM Images -- 3…Beyond the Perturbative Approach -- 4…A NCA Approach to the Kondo Effect -- 4.1 The Anderson Hamiltonian -- 4.2 The Noncrossing Approximation -- 5…Summary and Conclusions -- Acknowledgments -- References -- 11 Electronic Transmission Through a Single Impurity in a Multi-configuration Scattering Matrix Approach -- Abstract -- 1…Introduction -- 2…The Multi-Configuration Basis Set -- 3…Calculation of the Scattering Matrix on a Multi-Configuration Basis Set. , 4…Application to a Weakly Coupled Two-States Molecule Filled Up with Two Electrons -- 4.1 The Simple U=0 eV Non-interacting Case -- 4.2 A Large U = 4 eV Electron--Electron Interaction Case -- 5…Application to a Weakly Coupled Four-States Molecule with a Four Electrons Closed Shell Structure -- 6…Conclusion -- Appendix A: Parameters and Calculation Method for the Electron--Electron Interactions -- Appendix B: Some Useful Relations -- References -- 12 Electron Transport Through a Molecular Junction Using a Multi-configurational Description -- Abstract -- 1…Introduction -- 2…Theoretical Approach -- 2.1 Isolated Fragment Low-Energy Spectroscopy -- 2.2 Transport Through Magnetic Molecular Devices -- 3…Impact of the Electronic Structure of the Fragment -- 3.1 Influence of the Coulomb On-Site Repulsion U -- 3.2 Influence of the Multideterminantal Structure of the Wave-Function -- 4…Impact of the Spin-Polarization of the Electrodes -- 4.1 Parallel Magnetization -- 4.2 Antiparallel Magnetization -- 4.3 Magnetoresistance -- 4.4 Impact of the Multideterminantal Approach -- 5…Conclusion -- A.x(118). A. Coefficients -- A.x(118). B. Cancellation of Coefficients in {\bf i }_{\rm{ tot }} and {\bf P }^{{\rm{ i }}} for a Parallel Magnetization -- A.x(118). 8…C. Origin of the Quadratic Term in the Total Current for an Antiparallel Situation -- References -- 13 Visualizing Electron Correlation in Molecules Using a Scanning Tunneling Microscope: Theory and Ab Initio Prediction -- Abstract -- 1…Introduction -- 2…Many-Body Theory of STS with an Ideal Tip -- 3…Ab Initio Evaluation of the Quasiparticle Wave Function -- 4…Predicted STS Images of Copper-(deh-salen) -- 5…Conclusions -- Acknowledgments -- References -- Part VI NC-AFM -- 14 Submolecular Resolution Imaging of C_{60}: From Orbital Density to Bond Order -- Abstract -- 1…Introduction -- 2…Do We See Orbitals?. , 3…STM Observations of Intramolecular Contrast in C60 -- 4…Probing the Probe -- 5…Imaging Atoms and Bonds in C_{60} -- 6…Conclusions -- Acknowledgments -- References.
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  • 2
    Keywords: Forschungsbericht ; Altern
    Type of Medium: Online Resource
    Pages: Online-Ressource (18 S., 624,04 KB)
    Language: German
    Note: Engl. Berichtsbl. u.d.T.: Impact of health, social burden and community design on participation and autonomy in the aged: individual and regional resources , Förderkennzeichen BMBF 01ET1003C. - Verbund-Nr. 01086885 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Systemvoraussetzungen: Acrobat reader.
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  • 3
    Publication Date: 2024-01-12
    Description: Maniola butterflies undergo summer dormancy in dry and hot habitats and deposit their eggs only in early autumn when conditions become more favourable for their offspring. Female individuals of this genus are therefore relatively long-lived. For long-lived butterflies adult diet is of particular importance. We tested if added amino acids in nectar substitute fed to the butterflies affected timing of oviposition, fecundity and longevity. A hundred Maniola females were sampled from Mediterranean and Central European populations and made to oviposit under controlled laboratory conditions. Forty individuals were offered sucrose solution with additional amino acids while the remainder were fed with plain sucrose solution. We found that egg-laying strategies and longevity depended on geographic provenance rather than diet. Supplementary amino acids in adult diet did neither prolong lifetime nor increase total egg production. Maniola females from Sardinia started to lay eggs at least 20 days later relative to Central European M. jurtina and lived three times as long. Mediterranean individuals had on average twice the length of reproductive period and lifespan relative to Central European ones, and individuals of Pannonian origin lived longer than Alpine butterflies. Average total egg numbers were 200-350 eggs per female and did not differ significantly between populations. The fact that oviposition strategy could not be altered through diet may indicate that for univoltine butterflies, like Maniola, diet-quality at the adult stage is less important than endogenous factors, or factors the butterflies are exposed to in an earlier developmental stage than the imago. Oviposition strategy closely matched the climatic conditions that prevail in the geographic regions where these butterflies fly.
    Keywords: butterfly ecology ; oviposition ; longevity ; Maniola ; summer dormancy ; nectar amino acids ; Nymphalidae
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 4
    Publication Date: 2013-10-09
    Description: The basic-helix–loop–helix-leucine zipper (bHLHZip) protein MITF (microphthalmia-associated transcription factor) is a master regulator of melanocyte development. Mutations in the MITF have been found in patients with the dominantly inherited hypopigmentation and deafness syndromes Waardenburg syndrome type 2A (WS2A) and Tietz syndrome (TS). Additionally, both somatic and germline mutations have been found in MITF in melanoma patients. Here, we characterize the DNA-binding and transcription activation properties of 24 MITF mutations found in WS2A, TS and melanoma patients. We show that most of the WS2A and TS mutations fail to bind DNA and activate expression from melanocyte-specific promoters. Some of the mutations, especially R203K and S298P, exhibit normal activity and may represent neutral variants. Mutations found in melanomas showed normal DNA-binding and minor variations in transcription activation properties; some showed increased potential to form colonies. Our results provide molecular insights into how mutations in a single gene can lead to such different phenotypes.
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
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  • 5
    Publication Date: 2014-01-04
    Description: Nature Reviews Neurology 10, 5 (2014). doi:10.1038/nrneurol.2013.256 Authors: Jacques Grill & Christelle Dufour Medulloblastomas can be categorized into four molecular subgroups. A new report shows, for the first time, that these tumours remain in the same subgroup at relapse, and the molecular subgroup influences the pattern of relapse. These findings indicate that this developmentally defined classification is robust, although its relationship to prognosis remains uncertain.
    Topics: Medicine
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  • 6
    Publication Date: 2014-03-19
    Description: Individual in situ polymerized fluorene chains 10–100 nm long linked by C–C bonds are pulled vertically from an Au(111) substrate by the tip of a low-temperature atomic force microscope. The conformation of the selected chains is imaged before and after manipulation using scanning tunneling microscopy. The measured force gradient shows...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 7
    Publication Date: 2013-10-10
    Description: Gene set analysis (GSA) has been used for analysis of microarray data to aid the interpretation and to increase statistical power. With the advent of next-generation sequencing, the use of GSA is even more relevant, as studies are often conducted on a small number of samples. We propose the use of soft truncation thresholding and the Gamma Method (GM) to determine significant gene set (GS), where a generalized linear model is used to assess per-gene significance. The approach was compared to other methods using an extensive simulation study and RNA-seq data from smallpox vaccine study. The GM was found to outperform other proposed methods. Application of the GM to the smallpox vaccine study found the GSs to be moderately associated with response, including focal adhesion (p = 0.04) and extracellular matrix receptor interaction (p = 0.05). The application of GSA to RNA-seq data will provide new insights into the genomic basis of complex traits. Scientific Reports 3 doi: 10.1038/srep02898
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
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  • 8
    Publication Date: 2013-12-03
    Description: Definitions of healthy ageing include survival to a specific age, being free of chronic diseases, autonomy in activities of daily living, wellbeing, good quality of life, high social participation, only mild cognitive or functional impairment, and little or no disability. The working group Epidemiology of Ageing of the German Association of Epidemiology organized a workshop in 2012 with the aim to present different indicators used in German studies and to discuss their impact on health for an ageing middle-European population. Workshop presentations focused on prevalence of chronic diseases and multimorbidity, development of healthy life expectancy at the transition to oldest-age, physical activity, assessment of cognitive capability, and functioning and disability in old age. The communication describes the results regarding specific indicators for Germany, and hereby contributes to the further development of a set of indicators for the assessment of healthy ageing.
    Print ISSN: 1661-7827
    Electronic ISSN: 1660-4601
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by MDPI Publishing
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  • 9
    Publication Date: 2013-12-18
    Description: Nature Chemistry 6, 41 (2014). doi:10.1038/nchem.1804 Authors: Takashi Kumagai, Felix Hanke, Sylwester Gawinkowski, John Sharp, Konstantinos Kotsis, Jacek Waluk, Mats Persson & Leonhard Grill The rate of an intramolecular hydrogen transfer reaction in a single porphycene molecule resting on a copper surface can be controlled by placing a copper adatom close to it. Cooperativity effects are also observed in rows of porphycene molecules, where the reaction rate of each individual molecule depends on the precise tautomer state of its neighbours.
    Print ISSN: 1755-4330
    Electronic ISSN: 1755-4349
    Topics: Chemistry and Pharmacology
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  • 10
    Publication Date: 2013-12-20
    Description: Article Gene expression in the vascular endothelium is sensitive to shear forces exerted by the circulation. Here the authors identify miR-712 as a mechanosensitive microRNA expressed in endothelial cells and show that miR-712 inhibits pro-atherogenic processes by downregulating tissue inhibitor of metalloproteinase 3. Nature Communications doi: 10.1038/ncomms4000 Authors: Dong Ju Son, Sandeep Kumar, Wakako Takabe, Chan Woo Kim, Chih-Wen Ni, Noah Alberts-Grill, In-Hwan Jang, Sangok Kim, Wankyu Kim, Sang Won Kang, Andrew H. Baker, Jai Woong Seo, Katherine W. Ferrara, Hanjoong Jo
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
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