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  • Springer  (14)
  • American Institute of Physics  (2)
  • National Academy of Sciences  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The role of defects in laser surface damage thresholds of fluoride crystals (1989)
    Springer
    Applied physics 49 (1989), S. 199-204 
    Details
    ISSN: 1432-0630
    Keywords: 42.85Fe ; 61.80Ba ; 42.20Ji
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The energy of the acoustic pulse generated by laser-surface interactions and measured by probe beam deflection was used to investigate laser surface damage thresholds of fluoride crystals with optical quality. It was found that damage thresholds decrease with increasing density of surface states. The defect density also controls the energy absorption mechanism: for surfaces with few defects, like polished MgF2 and CaF2, avalanche breakdown occurs at above 1 GW/cm2, whereas for materials with lower damage thresholds, such as LiF, BaF2, and roughened or incubated surfaces of CaF2, multiphoton absorption across the band gap is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616299
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of oxygen and hydrogen on Pt(111) studied with second-harmonic generation (1995)
    Springer
    Applied physics 60 (1995), S. 209-215 
    Details
    ISSN: 1432-0630
    Keywords: 68.35 ; 82.20 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The adsorption of oxygen and hydrogen on a Pt(111) surface has been studied with phase-sensitive Second-Harmonic Generation (SHG) signal detection. The SHG-signal change measured with p-in, p-out polarization during the adsorption of oxygen and hydrogen was found to be different in amplitude and phase for the two adsorbates. At the wavelength used (1064 nm), only a localized interaction between adsorbate and substrate is seen, leading to a linear dependence of the susceptibility on the coverage. Sticking coefficients,sθ, and their coverage dependence were determined. For hydrogen, a linear decrease insθ with coverage was found; the initial sticking coefficient beings 0=0.06 at a temperature ofT=130 K. For oxygen,sθ whows a quadratic decrease with coverage, strongly dependent on temperature, withs 0=0.05 atT=350 K. A method based on these results is proposed, which would allow the determination of adsorbate coverages of coadsorption systems with SHG using phase-sensitive signal detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538248
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  • 3
    Electronic Resource
    Electronic Resource
    Adsorption of oxygen and hydrogen on Pt(111) studied with second-harmonic generation (1995)
    Springer
    Applied physics 60 (1995), S. 209-215 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The adsorption of oxygen and hydrogen on a Pt(111) surface has been studied with phase-sensitive Second-Harmonic Generation (SHG) signal detection. The SHG-signal change measured with p-in, p-out polarization during the adsorption of oxygen and hydrogen was found to be different in amplitude and phase for the two adsorbates. At the wavelength used (1064 nm), only a localized interaction between adsorbate and substrate is seen, leading to a linear dependence of the susceptibility on the coverage. Sticking coefficients, $s_\theta$ , and their coverage dependence were determined. For hydrogen, a linear decrease in $s _\theta$ with coverage was found; the initial sticking coefficient being $s_0= 0.06$ at a temperature of $T = 130$ K. For oxygen, $s_\theta$ shows a quadratic decrease with coverage, strongly dependent on temperature, with $s_0=0.05$ at $T = 350$ K. A method based on these results is proposed, which would allow the determination of adsorbate coverages of coadsorption systems with SHG using phase-sensitive signal detection. PACS68.35; 82.20; 42.65
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050092
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  • 4
    Electronic Resource
    Electronic Resource
    Characterisation of dissolving pulp using designed process variables, NIR and NMR spectroscopy, and multivariate data analysis (1999)
    Springer
    Cellulose 6 (1999), S. 233-249 
    Details
    ISSN: 1572-882X
    Keywords: dissolving pulp ; alkali resistance ; filterability ; NIR spectroscopy ; solid state NMR spectroscopy ; multivariate data analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Two processability variables, filter clogging and alkali resistance, were measured in a series of laboratory‐cooked viscose pulps. The pulps were also characterised by 13C‐CP/MAS solid state nuclear magnetic resonance (NMR) and near infrared (NIR) spectroscopy. Partial least squares (PLS) regression was used to investigate the information provided by the spectroscopic methods with respect to the processability measurements. The study showed that the alkali resistance, R18, of the pulp and the filter clogging value, Kw, of the laboratory‐prepared viscose can be modelled by NIR and multivariate data analysis (MVA). The alkali resistance, R18, of the pulp can also be calculated by NMR and partial least squares (PLS) regression. Analysis of the loading values in the PLS model showed that pulps with high alkali resistance have higher crystallinity than pulps with low alkali resistance. Analysis of variables of the cooking conditions showed that the chemical charge (Na2O) and pH should be kept low to give high alkali resistance, whereas high Na2O gives low filter clogging values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009273715004
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  • 5
    Electronic Resource
    Electronic Resource
    REMPI as a tool for studies of OH radicals in catalytic reactions (1997)
    Springer
    Applied physics 64 (1997), S. 573-578 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 33.80K, 07.75, 82.65J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 +½ O2→H2O on polycrystalline Pt foils has been studied by detection of desorbing OH radicals using the Resonance Enhanced Multiphoton Ionization, REMPI, technique. The measurements were performed at catalyst temperatures of 1000–1400 K and a total pressure below 10-4 mbar. The studies of OH desorption by REMPI were achieved using a two-photon excitation D2Σ-–X2Π (1–0), followed by one-photon ionization. The ions were detected in a time-of-flight mass spectrometer, TOF-MS, in order to avoid interference from non-resonantly ionized molecules. By applying TOF-MS, a simultaneous non-resonant ionization and detection of H2, O2 and H2O was achieved. Recorded REMPI spectra were compared with spectra simulated using known molecular constants. The kinetics of the reaction derived from the measurements were compared with what was obtained in earlier LIF detection of OH, performed at higher total reactant pressure using the A–X transition. REMPI TOF-MS is shown to be a complement to LIF for reaction studies below 5×10-4 mbar total pressure, where LIF is too insensitive for quantification. The reaction kinetics was found to be in agreement with a theoretic model and previous LIF studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050217
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  • 6
    Electronic Resource
    Electronic Resource
    Präzisionsbestimmung der Gitterkonstante von Quarz und Neumessung derKα-Wellenlängen der Elemente 45 Rh, 46 Pd und 47 Ag (1937)
    Springer
    The European physical journal 106 (1937), S. 315-321 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Gitterkonstante von Quarz (Ebene 0001) ist in den drei ersten Ordnungen mit MoKα1 bestimmt worden. Weiter sind die Kα2 und Kα1-Linien der Elemente 45 Rh, 46 Pd und 47 Ag in den zwei ersten Ordnungen gemessen worden. Der Brechungsindex von Quarz für die betreffenden Wellenlängen wurde ebenfalls ausgewertet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338739
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  • 7
    Electronic Resource
    Electronic Resource
    Die Gitterkonstante von Topas (1936)
    Springer
    The European physical journal 101 (1936), S. 113-116 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Gitterkonstante von Topas parallel der Spaltfläche ist in den drei ersten Ordnungen mit Cu K α1 gemessen. Aus diesen gefundenen Werten sind die Gitterkonstantenwerte höherer Ordnung berechnet. Der Brechungsindex von Topas für die betreffende Wellenlänge ist ebenfalls ausgewertet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01336849
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  • 8
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    Clinical and veterinary trypanocidal benzoxaboroles target CPSF3 (2018)
    National Academy of Sciences
    Details
    Publication Date: 2018-09-05
    Description: African trypanosomes cause lethal and neglected tropical diseases, known as sleeping sickness in humans and nagana in animals. Current therapies are limited, but fortunately, promising therapies are in advanced clinical and veterinary development, including acoziborole (AN5568 or SCYX-7158) and AN11736, respectively. These benzoxaboroles will likely be key to the World Health Organization’s target of disease control by 2030. Their mode of action was previously unknown. We have developed a high-coverage overexpression library and use it here to explore drug mode of action in Trypanosoma brucei. Initially, an inhibitor with a known target was used to select for drug resistance and to test massive parallel library screening and genome-wide mapping; this effectively identified the known target and validated the approach. Subsequently, the overexpression screening approach was used to identify the target of the benzoxaboroles, Cleavage and Polyadenylation Specificity Factor 3 (CPSF3, Tb927.4.1340). We validated the CPSF3 endonuclease as the target, using independent overexpression strains. Knockdown provided genetic validation of CPSF3 as essential, and GFP tagging confirmed the expected nuclear localization. Molecular docking and CRISPR-Cas9-based editing demonstrated how acoziborole can specifically block the active site and mRNA processing by parasite, but not host CPSF3. Thus, our findings provide both genetic and chemical validation for CPSF3 as an important drug target in trypanosomes and reveal inhibition of mRNA maturation as the mode of action of the trypanocidal benzoxaboroles. Understanding the mechanism of action of benzoxaborole-based therapies can assist development of improved therapies, as well as the prediction and monitoring of resistance, if or when it arises.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Surface laser damage thresholds determined by photoacoustic deflection (1988)
    American Institute of Physics
    Details
    Publication Date: 1988-11-21
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Effect of wet spinning parameters on the properties of novel cellulosic fibres (2008)
    Springer
    Details
    Publication Date: 2008-04-12
    Print ISSN: 0969-0239
    Electronic ISSN: 1572-882X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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