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  • 1
    Electronic Resource
    Electronic Resource
    Evidence that the catalytic differences of two structurally homologous forms of cytochrome P-450 relate to their heme environment (1988)
    s.l. : American Chemical Society
    Biochemistry 27 (1988), S. 1597-1603 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00405a031
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  • 2
    Electronic Resource
    Electronic Resource
    Site-directed mutagenesis and proton NMR spectroscopy of an interdomain segment in the pyruvate dehydrogenase multienzyme complex of Escherichia coli (1988)
    s.l. : American Chemical Society
    Biochemistry 27 (1988), S. 289-296 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00401a044
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  • 3
    Electronic Resource
    Electronic Resource
    Regional chromosomal assignment of the Kell blood group locus (KEL) to chromosome 7q33-q35 by fluorescence in situ hybridization: evidence for the polypeptide nature of antigenic variation (1993)
    Springer
    Human genetics 〈Berlin〉 91 (1993), S. 585-588 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The gene encoding the Kell blood group polypeptide has been localized to chromosome 7q33-35 by in situ hybridization using a biotinylated 1.1-kb DNA fragment containing the 3′ half of the human cDNA. This assignment is in accord with genetic localization using antigenic variation as a marker, and strongly suggests that Kell antigenic determinants are part of the polypeptide chain rather than the associated sugar molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00205085
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  • 4
    Electronic Resource
    Electronic Resource
    An intelligent risk assessment system for distributed construction teams (2005)
    Oxford : Emerald
    Engineering, construction and architectural management 12 (2005), S. 391-409 
    Details
    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Purpose - The paper proposes addressing the design and implementation of a web-based risk assessment system that enables remote project team members to assess the risks at the conceptual design stage. Design/methodology/approach - The prototype system is based on a client/server architecture and uses fuzzy logic and web-based technology. A risk assessment scenario is used to demonstrate the operation and benefits of the prototype system. Findings - The research found that the use of a web-based risk assessment system for distributed project team members has major benefits in terms of use of linguistic terms to express risk assessment, ease of communication, ease of maintenance, and greater consistency, among others. Research limitations/implications - There is scope for enhancing the system through the development of a risk management module, improving the user interface and making specific provisions for different project types. Practical implications - The move in industry towards collaborative working practices is supported by systems such as this. Risk assessment is an important area that requires the input of all team members, if evenly distributed. Originality/value - This paper has presented an innovative approach to risk assessment for distributed project teams. It will be of interest to all parties involved in construction projects, particularly those involved in risk assessment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980510608839
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  • 5
    Electronic Resource
    Electronic Resource
    AN EXAMINATION OF THE MECHANISMS CONTROLLING GROUNDWATER GRADIENTS IN HYPER-ARID REGIONAL SEDIMENTARY BASINS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 22 (1986), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Although evidence of modern recharge in the North African and Arabian sedimentary basin aquifers exists, it is difficult to determine the volume of recharge. Also, from the evidence of regional groundwater gradients, the flow within the aquifers seems to be appreciably greater than one would intuitively expect. A hypotehtical model embodying the characteristics of the aquifers has been used to investigate the likely significance of various possible flow mechanisms. It is shown that while dewatering in the unconfined area can possibly contribute to flows for a considerable period of time, the maintenance of water levels in the unconfined zone must be the result of modern recharge. It is also shown that recharge depths of less than 10 mm per annum are sufficient given suitable aquifer parameters. Results for various combinations of aquifer parameters and configurations are given, including layered aquifers and the effects of restricted oufflows. Comparisons are made using a “bench mark” example.The work indicates that there is little point in carrying out conventional hydrological balance studies in hyper-arid areas and that, instead, more emphasis should be placed upon good groundwater hydrographic data and modeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1986.tb01902.x
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  • 6
    Electronic Resource
    Electronic Resource
    Richardson's criterion for the stability of stratified shear flow (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3470-3471 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chandrasekhar's derivation, from energy considerations, of the sufficient condition R〉1/4 for stability of a stratified shear flow, in which R is the local Richardson number, is amended to obtain R〉1, in agreement with the earlier arguments of Richardson, Taylor, and Prandtl(L. F. Richardson, Proc. R. Soc. London Ser. A 97, 354 (1920); G. I. Taylor, Rapp. P. V. Reun. Cons. Permanent Int. d'Exploration Mer 76, 35 (1931); Sci. Pap. 2, 240; L. Prandtl, Vorträge aus dem Gebiete der Aerodynamik und verwandten Gebieten (Springer, Berlin, 1930), pp. 1–7; L. Prandtl, Führer durch die Strömungslehre (Vieweg, Braunschweig, 1942), p. 337; Essentials of Fluid Dynamics [English translation of 1949 edition of Führer durch die Strömungslehre (Hafner, New York, 1952), pp. 381 and 382]).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865812
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  • 7
    Electronic Resource
    Electronic Resource
    Sequence homologies between argininosuccinase, aspartase and fumarase: A family of structurally-related enzymes (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 51 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Aspartase, fumarase (Class II) and argininosuccinase are homotetrameric enzymes of native Mr∼ 200 000, and they all catalyse analogous trans-elimination reactions involving fumarate. Amino acid sequence comparisons have revealed five mutually-conserved segments of primary structure, indicating that the enzymes belong to the same family. Several putative active-site residues, e.g., histidine, methionine, lysine, and aspartate or glutamate, have been detected, and one of the highly-conserved segments was also found in an otherwise unrelated homodimeric Class I fumarase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02994.x
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Magnetic Field on Dielectrics. (1930)
    [s.l.] : Nature Publishing Group
    Nature 126 (1930), S. 438-438 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a letter in the issue of NATURE for July 12, Prof. P. L. Burns states that the power factor of certain dielectrics is decreased when a constant magnetic field is superimposed on the dielectric which is being subjected to an alternating electric stress. One would expect that on the Debye ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/126438a0
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  • 9
    Electronic Resource
    Electronic Resource
    Parametric excitation of an internally resonant double pendulum, II (1986)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 37 (1986), S. 641-650 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß das Verhalten kleiner, endlicher Amplitude eines gedämpften, intern resonanten Doppelpendels unter parametrischer Erregung mit der vierfachen Eigenfrequenz des Hauptpendels chaotisch ist für bestimmte Frequenz- und Dissipationswerte. Dies steht im Gegensatz zu Miles [1], wo die erregende Frequenz ungefähr das zweifache der Eigenfrequenz betrug und sich normale Bewegung für alle Frequenzen und Dissipationen ergab.
    Notes: Summary The small, finite amplitude response of a damped, internally resonant double pendulum subject to parametric excitation at four times the frequency of the dominant pendulum is shown to exhibit chaotic behavoir for certain values of frequency offset and dissipation. This is in contrast to Miles [1], where the driving frequency approximated twice that of the dominant pendulum, and regular motion was found to exist for all values of frequency offset and dissipation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00947912
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  • 10
    Electronic Resource
    Electronic Resource
    Parametric excitation of an internally resonant double pendulum (1985)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 36 (1985), S. 337-345 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Ein System von schwach gedämpften, nichtlinear gekoppelten Pendeln mit den (ungekoppelten) natürlichen Frequenzenω 1 undω 2≅2ω 1 wird vertikalen erzwungenen Schwingungen mit der Frequenz 2ω≅2ω 1 unterworfen. Die entstehende Bewegung ist (nach dem Abklingen von temporären Bewegungsanteilen) entweder eine einfache Translation des (starren) Systems oder aber eine solche Translation mit überlagerten gekoppelten Schwingungen der Pendel. Die Stabilität dieser beiden Bewegungstypen wird untersucht, und ihr parametrischer Gültigkeitsbereich wird bestimmt. Es gibt keine Hopf-Bifurkationen, so daß weder periodisch modulierte noch chaotische Bewegungen möglich erscheinen (für schwache Erregungen). Das entsprechende Problem für ein symmetrisches Dreifach-Pendel ergibt sich isomorph zu dem des Doppel-Pendels.
    Notes: Summary A system of two weakly damped, nonlinearly coupled pendulums with (uncoupled) natural frequencies ofω 1 andω 2≅ 2ω 1 is subjected to a small, vertical oscillation of frequency 2ω≅2ω 1. The resulting motion (after transients have decayed) may be either a simple (rigid-body) translation of the entire system or coupled oscillations of the pendulums superimposed on such a translation. The stability of these two types of motion is examined and their parametric domains established. There are no Hopf bifurcations, in consequence of which neither periodically modulated nor chaotic motions appear to be possible (for weak excitation). The corresponding problem for a symmetric triple pendulum is shown to be isomorphic to that for the double pendulum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944628
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