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  • 1995-1999  (50)
  • 1975-1979  (16)
  • 1950-1954  (1)
  • 1935-1939  (20)
  • 1930-1934  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Diastereoselectivity in the Michael-Type Addition of Imines Reacting as Their Secondary Enamine Tautomers (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 1143-1147 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00110a015
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  • 2
    Electronic Resource
    Electronic Resource
    A Heisenberg Microscope for Atoms (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 755 (1995), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1995.tb38964.x
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic footprint of the ToxR-binding site in the promoter for cholera toxin (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 20 (1996), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The transmembrane DNA-binding protein, ToxR, of Vibrio cholerae is a global transcriptional regulator of virulence gene expression. ToxR has been shown to interact with promoter regions upstream of both the ctxAB operon encoding cholera toxin, and the regulatory gene toxT. Deletion analysis has shown that a repeated sequence, TTTTGAT, is required for ToxR binding and activation of the ctxAB promoter. However, this sequence is not found upstream of the toxT promoter. Genetic selections using P22 challenge phages were used to define sites within the promoter for ctxAB which are critical for ToxR-DNA interactions. Single-base-pair changes and deletion mutations that impair ToxR binding cluster within two regions: -57 to -69 within two of three tandem TTTTGAT sequences; and from -39 to -47, between the repeat sequences; and the -35 region of the promoter. ToxR does not bind to a synthetic target that has three tandem repeats which lack a flanking upstream and downstream sequence. These results suggest that the ToxR-binding site lies immediately upstream of the -35 position of the ctx promoter, and that the affinity of ToxR binding to this site is influenced by the repeat sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1996.tb02502.x
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  • 4
    Electronic Resource
    Electronic Resource
    Phase-coherent amplification of atomic matter waves (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 402 (1999), S. 641-644 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Atomic matter waves, like electromagnetic waves, can be focused, reflected, guided and split by currently available passive atom-optical elements. However, the key for many applications of electromagnetic waves lies in the availability of amplifiers. These active devices allow small signals to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/45194
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the Wigner function of an ensemble of helium atoms (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 150-153 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Beams of atoms can exhibit interference and diffraction phenomena just like waves of light. For a coherent beam of helium atoms in a double-slit experiment, measurements of the quantum-mechanical analogue of the classical phase-space distribution function show that the motion of atoms behaves ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386150a0
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  • 6
    Electronic Resource
    Electronic Resource
    CONTACT INACTIVATION OF RNA AND DNA VIRUSES BY N-METHYL ISATIN BETA-THIOSEMICARBAZONE AND CuSO4 (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 284 (1977), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1977.tb21986.x
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  • 7
    Electronic Resource
    Electronic Resource
    Chromatophorenanordnungen in emersen Thalli vonFucus vesiculosus unter verschiedenen Lichtbedingungen (1979)
    Springer
    Helgoland marine research 32 (1979), S. 228-238 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of light and darkness on chromatophore arrangements inFucus vesiculosus thalli exposed to air with one side (half dry) or with both sides (dry) were investigated. Low-intensity arrangement, high-intensity arrangement and dark arrangement were induced in submerged thalli. Then the thalli were exposed to air while light conditions were either kept constant or were changed. Independently of the light conditions, in all thalli exposed to air the chromatophores arranged more or less in the inner area of the cells, in epidermal cells as well as in cortical cells. Thus the chromatophore arrangements observed in submerged thalli differ in some respect from those exposed to low-tide conditions. Based on these observations the physiological and ecological role of chromatophore displacements in seaweeds is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189899
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur lichtinduzierten Chromatophorenverlagerung beiFucus vesiculosus (1978)
    Springer
    Helgoland marine research 31 (1978), S. 333-346 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light-induced transmission changes, measured microphotometrically in the brown algaFucus vesiculosus, are mainly the result of chromatophore displacements. Dose-response curves, as well as observations by microscope, have shown that the typical low-intensity arrangement occurs at 1 000 lux and the complete high intensity arrangement at 20 000 lux. The arrangements of the chromatophores — as well as their shapes — in dim light, strong light and darkness have been investigated. The chromatophore arrangements are different in the epidermal, cortical and medullary cells. In dim light the chromatophores are relatively large. The chromatophores of the epidermis are placed in the plasma layer of the inner cell halves. In the cortical and medullary cells the chromatophores occupy mainly the cell walls facing the light. In strong light the chromatophores are shorter and tend to become spherical. In the epidermis facing the light they move into the basal part of the cells, in the cortical and medullary cells they move to the center of the cell surrounding the nucleus. After some days of darkness the chromatophores of the epidermal cells occupy the inner periclinal and 2/3 of the anticlinal cell walls. In the cortical and medullary cells they are evenly distributed in the cytoplasmic layer at the wall. Obviously, the transmission changes measured are mainly due to chromatophore displacements in the cortical cells. Changes in shape and size play a minor role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189486
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  • 9
    Electronic Resource
    Electronic Resource
    Occurrence and biological role of light-induced chromatophore displacements in seaweeds (1979)
    Springer
    Marine biology 51 (1979), S. 77-82 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrence of light-induced chromatophore displacements and concomitant transmittance changes in marine algae was investigated by microscope and photometrically with an automated recording microphotometer system; 16 brown, 6 green and 20 red algae were studied. In most of the brown algae, both phaeoplast displacements and transmittance changes were found. In some red algae which are frequently exposed to direct sun light during emergence at low tide, light-induced transmittance changes were measured, but they could not unequivocally be correlated with changes in the position of rhodoplasts. Among green algae, only Ulva lactuca shows chloroplast displacements which, however, follow circadian rhythms and are consequently not light-induced in the strict sense. The dose-response curves of light-induced chromatophore displacements were measured in the following Fucus and Laminaria species: F. spiralis, F. vesiculosus, F. serratus, L. digitata, L. saccharina and L. hyperborea. While in Fucus species correlations between light-induced transmittance changes and zonation of the intertidal area seem to exist, no significant differences have been found in the Laminaria species. The physiological role and ecological importance of light-induced chromatophore displacements for seaweeds living in the intertidal belt are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389033
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  • 10
    Electronic Resource
    Electronic Resource
    Rapid communicationPattern generation with cesium atomic beams at nanometer scales (1996)
    Springer
    Applied physics 63 (1996), S. 649-652 
    Details
    ISSN: 1432-0649
    Keywords: PACS:07.77.Gx; 42.82.Cr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We have demonstrated that a cesium atomic beam can be used to pattern a gold surface using a self assembling monolayer (SAM) as a resist. A 12.5 $\mu$ m period mesh was used as a proximity mask for the atomic beam. The cesium atoms locally change the wetability of the SAM, which allows a wet etching reagent to remove the underlying gold in the exposed regions. An edge resolution of better than 100 nm was obtained. The experiment suggests that this method can either be used as a sensitive position detector with nanometer resolution in atom optics, or for nanostructuring in a resist technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831007
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