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  • 1
    Electronic Resource
    Electronic Resource
    2-Acetoxyfuran. A Study of its Preparation and its Behavior as a Diene (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 2303-2304 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01591a074
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  • 2
    Electronic Resource
    Electronic Resource
    Electron tunneling detected by electrostatic force (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3615-3617 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is introduced for measuring the tunneling of electrons between a specially fabricated scanning probe microscope tip and a surface. The technique is based upon electrostatic force detection of charge as it is transferred to and from a small (10−17 F) electrically isolated metallic dot on the scanning probe tip. The methods for dot fabrication, charging, and discharging are described and electron tunneling to a sample surface is demonstrated. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1330568
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  • 3
    Electronic Resource
    Electronic Resource
    Anaesthetic machine checklists 1 (2001)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 56 (2001), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.2001.2279-6.x
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  • 4
    Electronic Resource
    Electronic Resource
    Studies of local structure of Cm3+ in borosilicate glass using laser and x-ray spectroscopic methods and computational modeling (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 1489-1496 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The local environment of Cm3+ in a borosilicate glass has been probed by a combination of laser spectroscopy, structural modeling, and extended x-ray absorption fine structure (EXAFS) spectroscopy. The Stark splitting for the Cm f–f state transitions is significantly larger than the inhomogeneous line broadening that results from the disordered environment. As a result, the Cm optical spectrum can be fit using an effective operator Hamiltonian to obtain a set of crystal-field parameters. The fitting procedure, which requires the use of a descent-in-symmetry approach, provides a set of parameters for a best fit within tetragonal symmetry. These parameters are then linked to the local environment of Cm through exchange-charge modeling (ECM) of crystal field interactions. Cm in our borosilicate glass is best modeled with six oxygen ions with approximately tetragonal symmetry, and at an average distance of 2.31 (3) Å. The results of crystal-field modeling are supported by EXAFS results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480687
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  • 5
    Electronic Resource
    Electronic Resource
    Effusive-flow characterization of arbitrary size and geometry target/vapor transport systems: RIB applications : Papers from the Ninth International Conference on Ion Sources (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 786-788 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The principal factors that limit intensities of short-lived radioactive ion beams produced by the isotope separator on-line technique are time delays due to diffusion of radioactive species from solid or liquid target materials and their effusive-flow transport to the ion source. Although diffusion times can be reduced by proper design of short diffusion length, highly refractory targets, effusive-flow times are more difficult to assess. After diffusion from the target material, the species must travel through the target material and vapor transport system to the ion source. The time required for effusive-flow transport to the ion source depends on the conduction path, chemical reactions between the species and target material and materials of construction, as well as the physical size and geometry of the transport system. We have developed a fast valve (0.1 ms closing time) for introducing gaseous or vapor-state species into the target/vapor transport/ion source/system that permits measurement of effusive-flow times for any gaseous or vaporous species (chemically active or chemically inactive) through any vapor transport system, independent of size and geometry. Characteristic times are determined from the exponential decay of the momentum analyzed ion beam intensity for the species during effusive flow through the vapor transport system under evaluation. This article describes the effusive-flow apparatus and presents characteristic time spectra and characteristic effusive-flow time data for noble gases flowing through a serial-flow target reservoir system. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1430868
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  • 6
    Electronic Resource
    Electronic Resource
    An Insect attacking Striga (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1668-1668 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A study of Striga in Nigeria has revealed that in certain areas considerable numbers of the fruits produced by the plant are infected with the larvae of Smicronyx sp. (ColeopteraiCurculionidse). The eggs of Smicronyx are probably laid in the developing fruit or ovary. The larvae lives within the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841668a0
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  • 7
    Electronic Resource
    Electronic Resource
    The ‘Seebeck Effect’ in a Purely Ionic System (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 668-669 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Variation of ± AylAT with log e for cation-CR) and anion-(iJ') exchange resins. KR represent the cation resin in the potassium form, etc. The observed values of A 9/AT were negative for the anion resin. The full and broken lines have the slope 2 '303 RjzF ; the broken line refers to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177668b0
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  • 8
    Electronic Resource
    Electronic Resource
    Action of Inhibitor- β on the Growth of Striga Seedlings (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1577-1578 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Growth curves of Striga ltea seedlings (radicles) in water and in inhibitor-3 zone ; and of seedlings grown for varying periods in the inhibitor before being transferred to water. Unsoaked, air dried Striga ltea seeds contain highly active inhibitors that move in the region of R F 0-6 in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841577b0
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  • 9
    Electronic Resource
    Electronic Resource
    Resistance of Sorghum to Witchweed (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1511-1512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The possibility of the lower germination by the resistant variety being due to the interaction of an inhibitor with the stimulatory substance was investigated. A comparison was made of the stimulating root solution from the susceptible variety diluted: (1) with water, and (2) with 'Framida' root ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841511a0
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  • 10
    Electronic Resource
    Electronic Resource
    Ice Shelf Microbial Ecosystems in the High Arctic and Implications for Life on Snowball Earth (2000)
    Springer
    Naturwissenschaften 87 (2000), S. 137-141 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  The Ward Hunt Ice Shelf (83°N, 74°W) is the largest remaining section of thick (〉10 m) landfast sea ice along the northern coastline of Ellesmere Island, Canada. Extensive meltwater lakes and streams occur on the surface of the ice and are colonized by photosynthetic microbial mat communities. This High Arctic cryo-ecosystem is similar in several of its physical, biological and geochemical features to the McMurdo Ice Shelf in Antarctica. The ice-mats in both polar regions are dominated by filamentous cyanobacteria but also contain diatoms, chlorophytes, flagellates, ciliates, nematodes, tardigrades and rotifers. The luxuriant Ward Hunt consortia also contain high concentrations (107–108 cm–2) of viruses and heterotrophic bacteria. During periods of extensive ice cover, such as glaciations during the Proterozoic, cryotolerant mats of the type now found in these polar ice shelf ecosystems would have provided refugia for the survival, growth and evolution of a variety of organisms, including multicellular eukaryotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050692
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