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  • 2010-2014  (69)
  • 1860-1869  (2)
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  • 1
    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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  • 2
    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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  • 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
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 11 (1863), S. 76-78 
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 11 (1863), S. 159-160 
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2012-02-24
    Description: We used simultaneous Pockels effect and photoconductivity measurements to study of processes in high-resistivity CdZnTe semiconductor X-ray and gamma ray detector material at steady state high flux conditions. We have proven, that with an appropriate choice of monochromatic laser light, the profile of the electric field is nearly the same as with a polychromatic X-ray source. We observed that the electric field is strongly deformed in the case of both above and below bandgap laser radiation. This leads to a decrease of the photocurrent when the sample is illuminated with above bandgap radiation. When below bandgap illumination is used the photocurrent values are not affected by electric field weakening. This is explained by increased filling of the midgap trap with trapped electrons leading to an increase of the lifetime.
    Electronic ISSN: 1748-0221
    Topics: Physics
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  • 7
    Publication Date: 2013-08-22
    Description: Background This multicenter phase II study investigated temozolomide + irinotecan (TEMIRI) treatment in children with relapsed or refractory medulloblastoma. Methods Patients received temozolomide 100–125 mg/m 2 /day (days 1–5) and irinotecan 10 mg/m 2 /day (days 1–5 and 8–12) every 3 weeks. The primary endpoint was tumor response within the first 4 cycles confirmed ≥4 weeks and assessed by an external response review committee (ERRC). In a 2-stage Optimum Simon design, ≥6 responses in the first 15 evaluable patients were required within the first 4 cycles for continued enrollment; a total of 19 responses from the first 46 evaluable patients was considered successful. Results Sixty-six patients were treated. Seven responses were recorded during stage 1 and 15 in the first 46 ERRC evaluated patients (2 complete responses and 13 partial responses). The objective response rate during the first 4 cycles was 32.6% (95% confidence interval [CI], 19.5%–48.0%). Median duration of response was 27.0 weeks (7.7–44.1 wk). In 63 patients evaluated by local investigators, the objective response rate was 33.3% (95% CI, 22.0%–46.3%), and 68.3% (95% CI, 55.3%–79.4%) experienced clinical benefit. Median survival was 16.7 months (95% CI, 13.3–19.8). The most common grade 3 treatment-related nonhematologic adverse event was diarrhea (7.6%). Grade 3/4 treatment-related hematologic adverse events included neutropenia (16.7%), thrombocytopenia (12.1%), anemia (9.1%), and lymphopenia (9%). Conclusions The planned study primary endpoint was not met. However, its tolerability makes TEMIRI a suitable candidate chemotherapy backbone for molecularly targeted agents in future trials in this setting.
    Print ISSN: 1522-8517
    Electronic ISSN: 1523-5866
    Topics: Medicine
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  • 8
    Publication Date: 2013-07-02
    Description: A complex role has been described for dendritic cells (DCs) in the potentiation and control of vascular inflammation and atherosclerosis. Resident vascular DCs are found in the intima of atherosclerosis-prone vascular regions exposed to disturbed blood flow patterns. Several phenotypically and functionally distinct vascular DC subsets have been described. The functional heterogeneity of these cells and their contributions to vascular homeostasis, inflammation, and atherosclerosis are only recently beginning to emerge. Here, we review the available literature, characterizing the origin and function of known vascular DC subsets and their important role contributing to the balance of immune activation and immune tolerance governing vascular homeostasis under healthy conditions. We then discuss how homeostatic DC functions are disrupted during atherogenesis, leading to atherosclerosis. The effectiveness of DC-based "atherosclerosis vaccine" therapies in the treatment of atherosclerosis is also reviewed. We further provide suggestions for distinguishing DCs from macrophages and discuss important future directions for the field.
    Print ISSN: 0363-6143
    Electronic ISSN: 1522-1563
    Topics: Medicine
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  • 9
    Publication Date: 2013-05-16
    Description: Objective— Atherosclerosis is an inflammatory disease with multiple underlying metabolic and physical risk factors. Bone morphogenic protein 4 (BMP4) expression is increased in endothelium in atherosclerosis-prone regions and is known to induce endothelial inflammation, endothelial dysfunction, and hypertension. BMP actions are mediated by 2 different types of BMP receptors (BMPRI and BMPRII). Here, we show a surprising finding that loss of BMPRII expression causes endothelial inflammation and atherosclerosis. Approach and Results— Using BMPRII siRNA and BMPRII +/– mice, we found that specific knockdown of BMPRII, but not other BMP receptors (Alk1, Alk2, Alk3, Alk6, ActRIIa, and ActRIIb), induced endothelial inflammation in a ligand-independent manner by mechanisms mediated by reactive oxygen species, nuclear factor-KappaB, and reduced nicotinamide adenine dinucleotide phosphate oxidases. Further, BMPRII +/– ApoE –/– mice developed accelerated atherosclerosis compared with BMPRII +/+ ApoE –/– mice. Interestingly, we found that multiple proatherogenic stimuli, such as hypercholesterolemia, disturbed flow, prohypertensive angiotensin II, and the proinflammatory cytokine (tumor necrosis factor-α), downregulated BMPRII expression in endothelium, whereas antiatherogenic stimuli, such as stable flow and statin treatment, upregulated its expression in vivo and in vitro. Moreover, BMPRII expression was significantly diminished in human coronary advanced atherosclerotic lesions. Also, we were able to rescue the endothelial inflammation induced by BMPRII knockdown by overexpressing the BMPRII wild type, but not by the BMPRII short form lacking the carboxyl-terminal tail region. Conclusions— These results suggest that BMPRII is a critical, anti-inflammatory, and antiatherogenic protein that is commonly targeted by multiple pro- and antiatherogenic factors. BMPRII may be used as a novel diagnostic and therapeutic target in atherosclerosis.
    Keywords: Animal models of human disease, Pathophysiology, Gene regulation, Endothelium/vascular type/nitric oxide, Mechanism of atherosclerosis/growth factors
    Print ISSN: 1079-5642
    Electronic ISSN: 1524-4636
    Topics: Medicine
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  • 10
    Publication Date: 2014-09-30
    Description: We have previously shown that kava and its flavokavain-free Fraction B completely blocked 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)-induced lung tumorigenesis in A/J mice with a preferential reduction in NNK-induced O 6 -methylguanine ( O 6 -mG). In this study, we first identified natural (+)-dihydromethysticin (DHM) as a lead compound through evaluating the in vivo efficacy of five major compounds in Fraction B on reducing O 6 -mG in lung tissues. (+)-DHM demonstrated outstanding chemopreventive activity against NNK-induced lung tumorigenesis in A/J mice with 97% reduction of adenoma multiplicity at a dose of 0.05mg/g of diet (50 ppm). Synthetic (±)-DHM was equally effective as the natural (+)-DHM in these bioassays while a structurally similar analog, (+)-dihydrokavain (DHK), was completely inactive, revealing a sharp in vivo structure–activity relationship. Analyses of an expanded panel of NNK-induced DNA adducts revealed that DHM reduced a subset of DNA adducts in lung tissues derived from 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL, the active metabolite of NNK). Preliminary 17-week safety studies of DHM in A/J mice at a dose of 0.5mg/g of diet (at least 10 x its minimum effective dose) revealed no adverse effects, suggesting that DHM is likely free of kava’s hepatotoxic risk. These results demonstrate the outstanding efficacy and promising safety margin of DHM in preventing NNK-induced lung tumorigenesis in A/J mice, with a unique mechanism of action and high target specificity.
    Print ISSN: 0143-3334
    Electronic ISSN: 1460-2180
    Topics: Medicine
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