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  • Elsevier  (77)
  • Springer  (41)
  • 1995-1999  (65)
  • 1990-1994  (53)
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Year
  • 1
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    Unknown
    Ferriferous bacterial encrustations in lateritic duricrusts from southern Mali (West Africa) (1994)
    Elsevier
    Details
    Publication Date: 1994-03-01
    Print ISSN: 0016-7061
    Electronic ISSN: 1872-6259
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Elsevier
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Ein Tabu Search-Verfahren für Containerbeladeprobleme mit schwach heterogenem Kistenvorrat (1998)
    Springer
    OR spectrum 20 (1998), S. 237-250 
    Details
    ISSN: 1436-6304
    Keywords: Transport ; Container ; Containerbelade-problem ; Tabu Search ; Praxisrelevante Restriktionen ; Packing ; Container ; Container loading problem ; Tabu search ; Practical restrictions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Abstract The paper presents a tabu search algorithm (TSA) for weakly heterogeneous container loading problems. The approach includes two integrated components: The generation of different stowage plans by means of a greedy algorithm and a tabu search using an appropriate representation of these plans. The TSA considers some restrictions of practical relevance. The overall algorithm has been applied to numerous benchmark problems and its performance is demonstrated by a numerical comparison with several loading procedures suggested by other authors.
    Notes: Zusammenfassung Gegenstand des Beitrags ist die Entwicklung eines Tabu Search-Verfahrens (TSV) für Containerbeladeprobleme mit schwach heterogenem Kistenvorrat. Das TSV basiert auf einem zweistufigen Verfahrensansatz. Ein integrierter Greedy-Algorithmus dient unmittelbar der Erzeugung von Stauplänen. Vermittelt über eine geeignete Repräsentation zulässiger Problemlösungen wird in einer zweiten Verfahrensstufe eine Tabu-Suche durchgeführt. Das TSV berücksichtigt einige praxisrelevante Restriktionen. Die Performance des TSV wird anhand von Benchmarkproblemen aus der Literatur demonstriert, wobei Containerbeladeverfahren verschiedener Autoren zu Vergleichszwecken herangezogen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539742
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1991)
    Springer
    OR spectrum 13 (1991), S. 118-122 
    Details
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01719938
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Energy dependence of one- and two-particle transfer reactions in the system16O+90Zr (1991)
    Springer
    The European physical journal 340 (1991), S. 281-286 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Cd ; 24.50.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy dependence of the one- and two-particle transfer reactions90Zr(16O,17O)89Zr,90Zr(16O,15N)91Nb and90Zr(16O,14C)92Mo was studied at bombarding energies of 80MeV, 138.2 MeV and 194.4 MeV. A comparison with one-step DWBA calculations shows good agreement for the one-particle transfers over the whole energy range. For the two-proton transfer reaction (16O,14C) the discrepancies between experiment and theory are large with an exponential decrease towards higher energies. Current theories are unable to describe this behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294676
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  • 5
    Electronic Resource
    Electronic Resource
    Natriuretic peptide hormones promote radial water movements from the xylem of Tradescantia shoots (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 1161-1167 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Natriuretic peptides in plants; water channels; cGMP; HgCl2; 2H NMR.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Immunological evidence suggests that plants, like vertebrates, contain natriuretic peptides (NPs) and that rat atrial NP (rANP) binds specifically to plant membranes and promotes concentration and conformation-dependent stomatal opening. Stomatal opening and specific increases in cGMP levels were also observed in response to immunoreactive plant NP (irPNP). Here we report that both 1 μM rANP and irPNP (100 ng total protein/100 μL) significantly increase radial water movements out of the xylem of shoots of Tradescantia multiflora. Enhanced radial water movements are also observed in response to the cell permeant cGMP analogue 8-Br-cGMP (100 nM). The water channel inhibitor mercuric chloride (HgCl2) significantly inhibits radial water movements at concentrations of 50 μM, while the presence of 10 μM 2-hydroxyethylmercaptoethanol (ME) prevents the inhibitory effect of the mercurial. The guanylate cyclase inhibitor LY 83583 at a concentration of 20 μM and sodium azide (NaN3) at concentrations of ≥ 1 μM both also reduce radial water movements. We therefore conclude that the regulation of radial water movement out of the xylem involves modulation of cGMP levels, water channels and respiration-dependent processes. In addition, we propose that NPs have a critical role to play in radial water movements out of the xylem and speculate that as in vertebrates, NP effects might, at least in part, be mediated via the regulation of guanylate cyclases and water channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050244
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  • 6
    Electronic Resource
    Electronic Resource
    Stomatal guard cell responses to kinetin and natriuretic peptides are cGMP-dependent (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 272-276 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Natriuretic peptide; kinetin; abscisic acid; cGMP; stomata; guard cells.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Immunological evidence suggests that plants contain natriuretic peptides (NPs) and furthermore (3- [125I]iodotyrosol28) rat atrial NP (rANP) binds specifically to plant membranes. rANP and immunoaffinity-purified plant NP analogues also promote concentration-dependent stomatal opening. Here we report that kinetin, a synthetic cytokinin, and rANP induce stomatal opening in Tradescantia albiflora and that the effect of rANP is critically dependent on the secondary structure of the peptide hormone. The native circular molecule is active, whereas the linearized molecule shows no biological activity. Furthermore, kinetin- and rANP-induced stomatal opening is reversibly inhibited by two in hibitors of guanylate cyclase, LY 83583 and methylene blue. Stomatal opening is also induced in a concentration-dependent manner by the cell-permeant cyclic guanosine-3′,5′-monophosphate (cGMP) analogue 8-Br-cGMP, and this effect is prevented by the stomatal closure promoting plant hormone abscisic acid (ABA). We conclude that in guard cells kinetin and rANP pathways operate via guanylate cyclase upregulation, and we propose that ABA-induced closure is not cGMP-dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050149
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  • 7
    Electronic Resource
    Electronic Resource
    Activated state in the lepidocrocite structure during thermal treatment (1990)
    Springer
    Naturwissenschaften 77 (1990), S. 177-179 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131161
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  • 8
    Electronic Resource
    Electronic Resource
    Ein Tabu Search-Verfahren für Containerbeladeprobleme mit schwach heterogenem Kistenvorrat (1998)
    Springer
    OR spectrum 20 (1998), S. 237-250 
    Details
    ISSN: 1436-6304
    Keywords: Schlüsselwörter: Transport – Container – Containerbeladeproblem – Tabu Search – Praxisrelevante Restriktionen ; Key words: Packing – Container – Container loading problem – Tabu search – Practical restrictions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Abstract. The paper presents a tabu search algorithm (TSA) for weakly heterogeneous container loading problems. The approach includes two integrated components: The generation of different stowage plans by means of a greedy algorithm and a tabu search using an appropriate representation of these plans. The TSA considers some restrictions of practical relevance. The overall algorithm has been applied to numerous benchmark problems and its performance is demonstrated by a numerical comparison with several loading procedures suggested by other authors.
    Notes: Zusammenfassung. Gegenstand des Beitrags ist die Entwicklung eines Tabu Search-Verfahrens (TSV) für Containerbeladeprobleme mit schwach heterogenem Kistenvorrat. Das TSV basiert auf einem zweistufigen Verfahrensansatz. Ein integrierter Greedy-Algorithmus dient unmittelbar der Erzeugung von Stauplänen. Vermittelt über eine geeignete Repräsentation zulässiger Problemlösungen wird in einer zweiten Verfahrensstufe eine Tabu-Suche durchgeführt. Das TSV berücksichtigt einige praxisrelevante Restriktionen. Die Performance des TSV wird anhand von Benchmarkproblemen aus der Literatur demonstriert, wobei Containerbeladeverfahren verschiedener Autoren zu Vergleichszwecken herangezogen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539742
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  • 9
    Electronic Resource
    Electronic Resource
    Heterogeneous Message Passing and a Link to Resource Management (1997)
    Springer
    The journal of supercomputing 11 (1997), S. 355-369 
    Details
    ISSN: 1573-0484
    Keywords: message passing ; computer resource management ; communication protocols ; PVM ; MPI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Parallel process communication and system resource management have been seen as two separate entities in parallel and distributed systems. This causes difficulties in the dynamic mapping of newly spawned processes, because the application has little or no information on the availability, the connectivity and the current work-load of the target system. As a consequence, process mappings are often sub-optimal, overloading resources on one system while other processors are idling. We present a software system named "PLUS" that provides • interprocess communication between different message passing models such as MPI, PVM and PARIX, and • access to resource management systems for optimal process mapping and task migration. PLUS is a light-weight, extensible and efficient communication interface. With only four commands, PLUS is almost transparent ot the application code. Our current implementation supports inter-process communication between PVM, MPI and PARIX, but it can be easily extended to other vendor-specific message passing libraries. As PLUS has been designed for wide area networks, much effort has been spent on portability and on optimizing the communication speed across internet and also intranet links.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007966723231
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  • 10
    Electronic Resource
    Electronic Resource
    Spatial and temporal expression of an Antennapedia/lac Z gene construct integrated into the endogenous Antennapedia gene of Drosophila melanogaster (1992)
    Springer
    Development genes and evolution 201 (1992), S. 65-80 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Homeotic gene regulation ; Antennapedia ; Development ; β-galactosidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In order to study the regulation of spatial and temporal expression of the homeotic gene Antennapedia (Antp) in Drosophila melanogaster, we have constructed fusion genes which contain Antp sequences linked to the reporter gene lac Z of Escherichia coli. In one case of P-element transformation, a fusion gene construct integrated into the endogenous Antp gene close to one of the two promoters (P1). The spatial expression from the reporter gene in this transformant line, as analysed by the detection of β-galactosidase activity, was found to exactly mimic the normal expression from the P1 promoter of the Antp gene. We have used this unique transformant as a tool for studying the expression of the P1 promoter in embryonic, larval and adult development. Parallel lines transformed with the same fusion gene construct did not confer a correct P1 pattern of expression. The position in the genome was, therefore, crucial for the expression pattern of the reporter gene. Experiments aiming at the detection of autoregulatory control of Antp gene expression were designed. The results did not, however, support models of positive or negative autoregulation of P1 expression by Amp protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420417
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