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  • 1
    Electronic Resource
    Electronic Resource
    Ta6Br14 is a useful cluster compound for isomorphous replacement in protein crystallography (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 186-191 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The metal cluster Ta6Br14 has been used to prepare heavy-metal derivatives of two large proteins, ribulose-1,5-bisphosphate carboxylase/oxygenase and transketolase. In both cases, this cluster compound produced a single-site derivative for which a difference Patterson map, calculated to 5.5 Å resolution, could be solved straightforwardly. Ta6Br14 provided enough phase information to unambiguously locate the heavy-atom positions in other multiple-site derivatives. In transketolase, the heavy-metal complex binds at the surface of the protein in a dominantly hydrophobic pocket. In ribulose bisphosphate carboxylase/oxygenase, it binds between two molecules in the crystal lattice. There are negatively charged glutamic and/or aspartic acid residues in the vicinity of the bound clusters. Ta6Br14 is useful over a wide range of pH. For large proteins and/or large unit cells, this compound should be included in the initial screening for heavy-metal derivatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444993009679
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  • 2
    Electronic Resource
    Electronic Resource
    A D-homotestosterone derivative (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 726-727 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270193012569
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  • 3
    Electronic Resource
    Electronic Resource
    3-Methoxy-16,16-dimethyl-5α-androstan-17-one (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 964-965 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270193012557
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of summer nutrient data obtained in Königshafen Bay (North Sea, German Bight) during two investigation periods: 1979–1983 and 1990–1992 (1994)
    Springer
    Helgoland marine research 48 (1994), S. 173-182 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparison of summer nutrients obtained during the investigation periods 1979–1983 and 1990–1992 was made, to elucidate whether or not changes have occurred in Königshafen Bay during the last decade. In both the flood current as well as in the ebb current, concentrations of silicate, phosphate, nitrite and nitrate have decreased. Ammonia, however, has increased by a factor of two in the flood current waters, but was similar in both investigation periods in the ebb current waters. In addition, a significant increase of salinity has been observed. The differences between flood and ebb current median nutrient concentrations suggest that the bay was a source of nutrients during the 1979–1983 period, exporting large amounts of silicate, nitrite and ammonia with the ebb current. Today, the bay appears to be more a sink than a source of nutrients. Export rates of silicate and nitrite are greatly reduced and phosphate and ammonia are imported nowadays. Nitrate fluxes were in balance during both periods. Reasons for the observed changes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367034
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  • 5
    Electronic Resource
    Electronic Resource
    Advances in control-volume-based finite-element methods for compressible flows (1994)
    Springer
    Computational mechanics 14 (1994), S. 431-446 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Recent developments in the application of a control-volume-based finite-element method, that has proven successful in solving incompressible flow problems, to the solution of compressible flow problems are presented. The finite Element Differential Scheme (FIELDS) is demonstrated to retain the pressure checker boarding problem for the case of Euler flow under certain conditions of flow. The source of this is investigated and remedies are provided that surmount this problem for all flows including Euler flows. Success is demonstrated for incompressible flow and a formulation is provided for extension to compressible flows. One dimensional testing on a supersonic converging-diverging nozzle exhibits extremely high accuracy of flow prediction including both shock strength and sharpness of resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377597
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  • 6
    Electronic Resource
    Electronic Resource
    Zooplankton standing stock and community size structure within the epipelagic zone: a comparison between the central Red Sea and the Gulf of Aden (1994)
    Springer
    Marine biology 119 (1994), S. 191-198 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Standing stock and size composition of the zooplankton comunity (〉100 μm) were studied in four depth strata of the upper 200 m of the water column during a “Meteor” cruise to the central Red Sea and Gulf of Aden in spring 1987. The central Red Sea was divided into a northern area of higher salinity and a less saline southern part. Both areas exhibited significant differences in zooplankton abundance and standing stock. The latter increased by the ratio 1:2:3 from the northern central Red Sea to its southern part and further south to the Gulf of Aden. For size structure analysis samples were fractionated into three size classes (100 to 300, 300 to 500, 500 to 5000 μm). In the central Red Sea the smallest size was dominant whereas in the Gulf of Aden the largest size fraction played a greater relative role than in the central Red Sea. This shift in size structure of the zooplankton community from the Red Sea to the Gulf of Aden is apparently primarily related to ecosystem difference between both areas, leading to a change in species composition. In addition, size reduction of individual species common to both seas may be of some significance in the extreme environment of the Red Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349556
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  • 7
    Electronic Resource
    Electronic Resource
    A new estimate for the Ginzburg-Landau approximation on the real axis (1994)
    Springer
    Journal of nonlinear science 4 (1994), S. 23-34 
    Details
    ISSN: 1432-1467
    Keywords: modulation equations ; Ginzburg-Landau approximation ; nonlinear partial differential equations on unbounded domains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary Modulation equations play an essential role in the understanding of complicated systems near the threshold of instability. For scalar parabolic equations for which instability occurs at nonzero wavelength, we show that the associated Ginzburg-Landau equation dominates the dynamics of the nonlinear problem locally, at least over a long timescale. We develop a method which is simpler than previous ones and allows initial conditions of lower regularity. It involves a careful handling of the critical modes in the Fourier-transformed problem and an estimate of Gronwall's type. As an example, we treat the Kuramoto-Shivashinsky equation. Moreover, the method enables us to handle vector-valued problems [see G. Schneider (1992)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02430625
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  • 8
    Electronic Resource
    Electronic Resource
    Multi-element characterization of tobacco smoke condensate (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 348 (1994), S. 218-225 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In an interlaboratory study, 57 elements were assayed and 35 of them determined in cigarette smoke condensate of two different cigarette brands. The methods applied included inductively coupled plasma mass spectrometry, total reflection X-ray fluorescence analysis, instrumental neutron activation analysis and atomic absorption spectrometry. The main components carbon, hydrogen and nitrogen were determined by a CHN-combustion method. Sulphur was determined by a method based on the formation of hydrogen sulphide and precipitation micro-titrimetry. Considering the occurring concentrations and the toxicity, the most relevant elements in cigarette smoke condensate are arsenic, cadmium and lead which have relatively high transfer rates from tobacco into smoke.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325364
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  • 9
    Electronic Resource
    Electronic Resource
    Gibberellin conjugates: an overview (1994)
    Springer
    Plant growth regulation 15 (1994), S. 247-260 
    Details
    ISSN: 1573-5087
    Keywords: chemical synthesis and analysis ; enzymology of GA glucose conjugates ; formation and conversion in vivo ; gibberellin conjugates ; natural occurrence ; physiological functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This article surveys the currently isolated and identified GA conjugates, their synthesis and evaluates modern methods for analysing GA glucose conjugates. The metabolism of applied GAs in higher plant systems leading, in most cases, to GA conjugates is also considered. The enzymology of the formation and hydrolysis of GA glucose conjugates is discussed in connection with their possible physiological function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029898
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  • 10
    Electronic Resource
    Electronic Resource
    A note of thanks (1994)
    Springer
    Natural hazards 9 (1994), S. iii 
    Details
    ISSN: 1573-0840
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690741
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