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  • Chemistry  (18)
  • Tephritidae  (5)
  • Quantum optics, physics of lasers, nonlinear optics, classical optics  (4)
  • 15N  (3)
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  • 1
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    Programmable two-photon quantum interference in 10^{3} channels in opaque scattering media (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-12
    Description: Author(s): Tom A. W. Wolterink, Ravitej Uppu, Georgios Ctistis, Willem L. Vos, Klaus-J. Boller, and Pepijn W. H. Pinkse We investigate two-photon quantum interference in an opaque scattering medium that intrinsically supports a large number of transmission channels. By adaptive spatial phase modulation of the incident wave fronts, the photons are directed at targeted speckle spots or output channels. From 10 3 experim… [Phys. Rev. A 93, 053817] Published Wed May 11, 2016
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Ground-state depletion for subdiffraction-limited spatial resolution in coherent anti-Stokes Raman scattering microscopy (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-08-17
    Description: Author(s): Carsten Cleff, Petra Groß, Carsten Fallnich, Herman L. Offerhaus, Jennifer L. Herek, Kai Kruse, Willem P. Beeker, Chris J. Lee, and Klaus-Jochen Boller We theoretically investigate ground-state depletion for subdiffraction-limited spatial resolution in coherent anti-Stokes Raman scattering (CARS) microscopy. We propose a scheme based on ground-state depopulation, which is achieved via a control laser light field incident prior to the CARS excitatio... [Phys. Rev. A 86, 023825] Published Thu Aug 16, 2012
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Coherent Cherenkov radiation and laser oscillation in a photonic crystal (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-11-29
    Description: Author(s): T. Denis, M. W. van Dijk, J. H. H. Lee, R. van der Meer, A. Strooisma, P. J. M. van der Slot, W. L. Vos, and K.-J. Boller We demonstrate that photonic crystals can be used to generate powerful and highly coherent Cherenkov radiation that is excited by the injection of a beam of free electrons. Using theoretical and numerical investigations we present the startup dynamics and coherence properties of such a laser, in whi… [Phys. Rev. A 94, 053852] Published Mon Nov 28, 2016
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Stimulated-emission pumping enabling sub-diffraction-limited spatial resolution in coherent anti-Stokes Raman scattering microscopy (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-26
    Description: Author(s): Carsten Cleff, Petra Groß, Carsten Fallnich, Herman L. Offerhaus, Jennifer L. Herek, Kai Kruse, Willem P. Beeker, Chris J. Lee, and Klaus-Jochen Boller We present a theoretical investigation of stimulated emission pumping to achieve sub-diffraction-limited spatial resolution in coherent anti-Stokes Raman scattering (CARS) microscopy. A pair of control light fields is used to prepopulate the Raman state involved in the CARS process prior to the CARS... [Phys. Rev. A 87, 033830] Published Mon Mar 25, 2013
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
    Electronic Resource
    Electronic Resource
    Host marking pheromone of Rhagoletis cerasi: field deployment of synthetic pheromone as a novel cherry fruit fly management strategy (1992)
    Springer
    Entomologia experimentalis et applicata 65 (1992), S. 141-147 
    Details
    ISSN: 1570-7458
    Keywords: Rhagoletis cerasi ; Tephritidae ; host marking pheromone ; pest management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We tested the efficacy of synthetic host marking pheromone (HMP) of the European cherry fruit fly (R. cerasi) as a fruit-infestation-reducing-agent in an experimental cherry orchard. Two different pheromone deployment strategies were compared: covering entire tree canopies with synthetic HMP or treating only one half (top to bottom or lower half) of the tree canopy. Pheromone application caused a tenfold reduction in fruit infestation if the entire tree canopy was covered (0.226 vs 0.021 pupae/fruit in untreated and treated trees, respectively). Results show, nevertheless, that a significant reduction in fruit infestation can be achieved by treating only one half of tree canopies (top to bottom) (0.021 vs 0.048 pupae/fruit when comparing totally vs partially treated trees). We conclude that synthetic cherry fruit fly HMP has potential as a fruit fly management tool, especially in cases where ‘organically’ grown fruit reaches high market values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221364
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  • 6
    Electronic Resource
    Electronic Resource
    Oviposition deterring pheromone in Rhagoletis cerasi: Biological activity of a pure single compound verified in semi-field test (1987)
    Springer
    Entomologia experimentalis et applicata 45 (1987), S. 17-22 
    Details
    ISSN: 1570-7458
    Keywords: Rhagoletis cerasi ; Diptera ; Tephritidae ; oviposition deterring pheromone ; behavior ; semi-field bioassay ; electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Mit zunehmenden Reinigungsschritten am Rohextrakt des Markierungspheromones (ODP) der Kirschenfliege, Rhagoletis cerasi L., und zunehmenden Reinheitsgrad des aktiven Prinzipes nimmt die Menge an Substanz ab, welche sowohl für die chemische Analyse wie auch die Prüfung der biologischen Aktivität zur Verfügung steht. Beim Vorliegen einer nicht mehr wägbaren Menge eines reinen Stoffes im Sommer 1985, welcher als ein Palmityl-glucopyranosid identifiziert werden konnte (Hurter et al., 1987), musste deshalb auf den üblichen Verhaltenstest im Labor verzichtet und ein neuer Lösungsansatz gefunden werden. Nachdem ein erster elektrophysiologischer Test positive Resultate gezeight hatte, wurde die Fraktion Nr. 2634 in einem grossen Freilandkäfig mit Kirschenpflanzen und natürlichen Früchten in einem Verhaltenstest auf ihre biologische Wirksamkeit geprüft. Die in dieser Arbeit präsentierten Resultate zeigen nicht nur, dass mit dem Palmityl-glucopyranosid eine ähnliche Wirkung erzielt wurde wie mit natürlichen ODP, sondern zum erstenmal konnte demonstriert werden, dass in R. cerasi und möglicherweise in andern Fruchtfliegenarten eine einzelne chemische Substanz eine eiablagehemmende Wirkung ausüben kann.
    Notes: Abstract A pure single compound, a palmityl-glucopyranoside identified as component of the oviposition deterring pheromone (ODP) of the European cherry fruit fly was evaluated with respect to its biological activity by means of a semi-field bioassay in a large field-cage with host plants. The comparison of the observed behaviors of flies exposed to clean cherries, to cherries treated with a standard ODP solution and with the pure compound revealed that palmityl-glucopyranoside elicited the same response as did the crude ODP solution. Irritation indices are described that seem to be of use for the characterization of cherry fruit fly behavior in the presence and absence of ODP. The advantages of the field-cage test over the standard laboratory tests are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343620
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  • 7
    Electronic Resource
    Electronic Resource
    Oviposition deterring pheromone in Rhagoletis cerasi: Behavioral laboratory test to measure pheromone activity (1985)
    Springer
    Entomologia experimentalis et applicata 39 (1985), S. 163-169 
    Details
    ISSN: 1570-7458
    Keywords: Rhagoletis cerasi ; Diptera ; Tephritidae ; oviposition deterring pheromone ; behavior test ; purification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Nach einer einleitenden Übersicht über den heutigen Stand der Erkenntnisse auf dem Gebiet der eiablage-hemmenden Pheromone (ODP) bei Fruchtfliegen und insbesondere der Kirschenfliege wird der verbesserte Verhaltenstest beschrieben, welcher für den halb-quantitativen Nachweis von ODP-Aktivität entwickelt worden ist. Im laufenden interdisziplinären Forschungsprogramm an der Eidg. Forschungsanstalt Wädenswil wird versucht, durch enge Zusammenarbeit zwischen Biologe, Chemiker und Elektrophysiologe das ODP der Kirschenfliege möglichst mit geringem Anteil an Verunreinigung einzusammeln, zu reinigen und einer chemischen Identifikation der ODP Komponenten zugänglich zu machen. Die Möglichkeiten und Grenzen des Verhaltenstests werden diskutiert und die Empfindlichkeit des Verfahrens mittels einer Konzentrationsreihe von Pheromonextrakt aufgezeigt.
    Notes: Abstract Current investigations concerning the identification of the chemical nature of the oviposition deterring pheromone of the European cherry fruit fly, Rhagoletis cerasi L., are conducted in an interdisciplinary research program by combining chemistry with behavioral evaluation. The methods used to collect and evaluate the pheromone by an improved semi-quantitative behavior test are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414504
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  • 8
    Electronic Resource
    Electronic Resource
    Oviposition-deterring pheromone inRhagoletis cerasi L.: Purification and determination of the chemical constitution (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 157-164 
    Details
    ISSN: 1420-9071
    Keywords: Tephritidae ; Rhagoletis cerasi L ; oviposition-deterring pheromone ; constitution ; purification ; electrophysiology ; contactchemoreceptors ; oviposition behavior ; fast atom bombardment mass spectrometry ; two-dimensional mass spectrometry ; gas chromatography ; mass spectrometry ; 1H-NMR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An oviposition-deterring pheromone (ODP) of the European cherry fruit flyRhagoletis cerasi L. was isolated from faeces using cellulose and several reverse phase TLC and HPLC procedures. The biological activity was evaluated by means of behavior tests and by electrophysiological recordings from tarsal contact chemoreceptors. The compound was structurally characterized as a N[15(β-glucopyranosyl)oxy-8-hydroxypalmitoyl]-taurine by spectroscopic means. The configurations of C-8 and C-15 of the fatty acid constituent remain to be established by synthetic work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01942834
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen fixation by white clover when competing with grasses at moderately low temperatures (1991)
    Springer
    Plant and soil 133 (1991), S. 47-56 
    Details
    ISSN: 1573-5036
    Keywords: clover ; competition ; grass ; Lolium perenne ; 15N ; nitrogen fixation ; Phleum pratense ; temperature ; Trifolium repens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract It was the aim of this study to determine the way in which low temperature modifies the effect of a competing grass on nitrogen fixation of a forage legume. White clover (Trifolium repens L.) was grown in monoculture or in different planting ratios with timothy (Phleum pratense L.) or perennial ryegress (Lolium perenne L.) in growth chambers at either 7.5/5°C (LoT) or 15/10°C (HiT) average day/night temperatures, and with 2.5 or 7.5 mM 15N-labelled nitrate in the nutrient solution. Competition with grass led to a marked increase in the proportion of clover nitrogen derived from symbiosis (% Nsym). This increase was slower at LoT where % Nsym was reduced considerably; it was closely related to the reduction in the amount of available nitrate as a result of its being utilized by the grass. Nitrogen concentration in white clover herbage and dry matter yield per clover plant were reduced, for the most part, when a competing grass was present. The amount of nitrogen fixed per plant of white clover decreased markedly with temperature. Low temperature consequently accentuated competition for nitrate. The capacity of white clover to compete successfully was limited by its slower growth and nitrogen accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011898
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  • 10
    Electronic Resource
    Electronic Resource
    Symbiotically fixed nitrogen from field- grown white and red clover mixed with ryegrasses at low levels of15N-fertilization (1987)
    Springer
    Plant and soil 104 (1987), S. 219-226 
    Details
    ISSN: 1573-5036
    Keywords: clover ; legume/grass mixture ; Lolium multiflorum ; Lolium perenne ; 15N ; nitrogen fixation ; nitrogen transfer ; Trifolium pratense ; Trifolium repens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field study was carried out near Zürich (Switzerland) to determine the yield of symbiotically fixed nitrogen (15N dilution) from white clover (Trifolium repens L.) grown with perennial ryegrass (Lolium perenne L) and from red clover (Trifolium pratense L.) grown with Italian ryegrass (Lolium multiflorum Lam.). A zero N fertilizer treatment was compared to a 30 kg N/ha per cut regime (90 to 150 kg ha−1 annually). The annual yield of clover N derived from symbiosis averaged 131 kg ha−1 (49 to 227 kg) without N fertilization and 83 kg ha−1 (21 to 173 kg) with 30 kg of fertilizer N ha−1 per cut in the seeding year. Values for the first production year were 308 kg ha−1 (268 to 373 kg) without N fertilization and 232 kg ha−1 (165 to 305 kg) with 30 kg fertilizer N ha−1 per cut. The variation between years was associated mainly with the proportion of clover in the mixtures. Apparent clover-to-grass transfer of fixed N contributed up to 52 kg N ha−1 per year (17 kg N ha−1 on average) to the N yield of the mixtures. Percentage N derived from symbiosis averaged 75% for white and 86% for red clover. These percentages were affected only slightly by supplemental nitrogen, but declined markedly during late summer for white clover. It is concluded that the annual yield of symbiotically fixed N from clover/grass mixtures can be very high, provided that the proportion of clover in the mixtures exceeds 50% of total dry mass yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372535
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