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  • Springer  (43)
  • Cell Press  (14)
  • Oxford University Press  (6)
  • 2000-2004  (63)
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  • 1
    Digitale Medien
    Digitale Medien
    A note on the estimation of microbial glycosidase activities by dinitrosalicylic acid reagent (2000)
    Springer
    Applied microbiology and biotechnology 53 (2000), S. 732-735 
    Details
    ISSN: 1432-0614
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract  In the estimation of glycosidase activity by dinitrosalicylic acid (DNS) reagent, the stoichiometry of DNS reduction was reported to increase proportionately with the increase in the number of glycosidic linkages present in oligosaccharides liberated by the enzyme. The relationship between increases in DNS reduction and increases in the number of glycosidic bonds was found to be represented by a part of a rectangular hyperbola. The increase was optimum with disaccharide and insignificant when the degree of polymerization (DP) was ≥10. The difference did not arise as a result of the DNSA discriminating between mono- and oligosaccharide oxidation. The relationship stemmed from the acidity of the hydroxyl group adjacent to the reducing group, which repressed DNS reduction. The acidity is likely to decrease with an increase in oligosaccharide chain length. It is suggested that DNS reduction is actually optimum and uniform for all oligosaccharides of DP ≥ 10 and that it is minimum for monosaccharide. Thus the introduction of rectification factors in the estimation of glycosidase activities by the DNS method appears to be justified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002530000327
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  • 2
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    A note on the estimation of microbial glycosidase activities by dinitrosalicylic acid reagent (2000)
    Springer
    Details
    Publikationsdatum: 2000-06-13
    Print ISSN: 0175-7598
    Digitale ISSN: 1432-0614
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Publiziert von Springer
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  • 3
    Digitale Medien
    Digitale Medien
    Algorithms for Dynamic Routing in All-Optical Networks (2000)
    Springer
    Photonic network communications 2 (2000), S. 163-184 
    Details
    ISSN: 1572-8188
    Schlagwort(e): wavelength routed optical network ; dynamic lightpath assignment ; all-optical networks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract In this paper, we have studied a number of algorithms for routing in all-optical wavelength routed networks. We have considered situations where a lightpath is dynamically created in response to a request for communication and the WDM channels constituting the lightpath are reclaimed when the communication is over. We have looked at two schemes for dynamic wavelength allocation. In the first scheme we have assumed the existence of a central agent to maintain a database of existing lightpaths where the central agent attempts to generate a new lightpath in response to a request for communication. In the second scheme, we attempt to generate a new lightpath using a distributed algorithm. In the first scheme we have exploited the existence of multiple paths between any pair of nodes in a network in order to reduce the blocking probability. For the second scheme, we have proposed three distributed strategies to determine, if possible, a lightpath when there is a request for communication. Each of these strategies have their advantages and disadvantages in terms of the expected blocking probability and the set-up time. We have studied the performances of both the schemes using Monte Carlo simulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010088407041
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  • 4
    Digitale Medien
    Digitale Medien
    An Optical Layer Lightpath Management Protocol for WDM AONs (2000)
    Springer
    Photonic network communications 2 (2000), S. 185-198 
    Details
    ISSN: 1572-8188
    Schlagwort(e): all-optical networks (AONs) ; WDM ; lightpath management ; optical layer protocol ; specification ; communicating finite state machine (CFSM) ; validation and reachability analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract In this work, we propose a control protocol for lightpath management in the optical layer of all-optical networks (AONs). AONs follow a layered structure, as used by various network standards, where each layer communicates with its peer through Protocol Data Units (PDUs). In the context of Open System Interconnection (OSI) Reference Model (RM), a new layer, called optical layer, has been introduced in the AON architecture to manage the lightpath related functions. The optical layer lies in between the physical layer and the data link layer. The objective of this paper is to define a specification for an optical layer protocol for managing lightpaths in AONs. In order to study the dynamics of the optical layer protocol system, we first employ the communicating finite state machine model to represent the protocol. Then a reachability analysis of the model is performed to verify the protocol. This paper shows how the optical layer protocol can be specified formally and made error-free by the step-wise refinement of an initial specification, where validation is done after each refinement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010040523879
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  • 5
    Digitale Medien
    Digitale Medien
    A Distributed Fault Management Scheme for Wavelength Routed All-Optical Networks (2000)
    Springer
    Photonic network communications 2 (2000), S. 369-382 
    Details
    ISSN: 1572-8188
    Schlagwort(e): all-optical networks ; fault management ; distributed algorithm ; dynamic routing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract This paper presents a distributed algorithm to determine fault avoiding routes between source-destination end-node pairs in an all-optical network. Fault-tolerant routing for WDM routed all-optical networks has not been studied in details in the literature except for using protection switching or loopback recovery. Such schemes use predetermined protection mechanism and hence assume that the protection path is not faulty. This paper considers extensions to a dynamic routing scheme (presented earlier by these authors for fault-free networks) to handle rerouting in case of fault occurrence. The performance degradations of the network because of fault occurrence are then studied in terms of blocking probability and set-up time through simulations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026522715035
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  • 6
    Digitale Medien
    Digitale Medien
    Optimal Tests for No Contamination in Reliability Models (2000)
    Springer
    Lifetime data analysis 6 (2000), S. 281-290 
    Details
    ISSN: 1572-9249
    Schlagwort(e): contamination model ; optimal tests ; Pivotal Parametric Product ; reliability distributions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Inferences on mixtures of probability distributions, in general,and of life distributions, in particular, are receiving considerableimportance in recent years. The likelihood ratio procedure oftesting for the null hypothesis of no contamination is oftenvery cumbersome and lacks its usual asymptotic properties. Recently,SenGupta (1991) has introduced the notion of an `L-optimal' testfor such testing problems. The idea is to recast the originalseveral parametric hypotheses representation of the null hypothesisin terms of only a single hypothesis involving an appropriatelychosen parametric function. This approach is shown to be bothmathematically elegant and operationally simple for a quite generalclass of mixture distributions which contains, in particular,all mixtures of the one-parameter exponential family and alsoa very rich subclass of mixtures useful in life-testing and reliabilityanalysis. It is also illustrated through two examples—onebased on real-life data and the other on a simulated sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009645810290
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  • 7
    Digitale Medien
    Digitale Medien
    ATM Routing Algorithms for Multimedia Traffic in Private ATM Networks (2000)
    Springer
    Journal of heuristics 6 (2000), S. 21-38 
    Details
    ISSN: 1572-9397
    Schlagwort(e): ATM networks ; dynamic routing ; PNNI ; simulations ; QoS ; multimedia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The goal of this paper is to recommend a good Private Network-to-Network Interface (PNNI) routing algorithm for private ATM networks. A good routing algorithm has to work well with multimedia traffic with several quality of service (QoS) requirements (such as cell loss ratio, cell delay and its variation etc.) in different networks under various traffic conditions. The multiplicity of QoS requirements makes the routing problem NP-complete, so our approach to the problem is based on large scale simulations involving several empirical algorithms (compliant with the PNNI routing specification) which have been tested for different network topologies and traffic scenarios. Based on analysis of tradeoffs involving performance metrics (such as blocking rate, complexity, load distribution) we recommend a consistently good routing algorithm for single domain ATM networks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009609609199
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  • 8
    Digitale Medien
    Digitale Medien
    Time-Space Harmonic Polynomials for Continuous-Time Processes and an Extension (2000)
    Springer
    Journal of theoretical probability 13 (2000), S. 951-976 
    Details
    ISSN: 1572-9230
    Schlagwort(e): time-space harmonic polynomials ; Lévy processes ; Semi-stable Markov processes ; Hochberg's measure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract A time-space harmonic polynomial for a stochastic process M=(M t) is a polynomial P in two variables such that P(t, M t) is a martingale. In this paper, we investigate conditions for the existence of such polynomials of each degree in the second, “space,” argument. We also describe various properties a sequence of time-space harmonic polynomials may possess and the interaction of these properties with distributional properties of the underlying process. Thus, continuous-time conterparts to the results of Goswami and Sengupta,(2) where the analoguous problem in discrete time was considered, are derived. A few additional properties are also considered. The resulting properties of the process include independent increments, stationary independent increments and semi-stability. Finally, a generalization to a “measure” proposed by Hochberg(3) on path space is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007857823002
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  • 9
    Digitale Medien
    Digitale Medien
    Reactions of bis(cyclopentadienyl)titanium(IV) and zirconium(IV) chlorides with 1,1′-diacetylferrocenyl bis(hydrazones). Formation of trimetallic derivatives (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 613-616 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Bis(cyclopentadienyl)titanium(IV) and zirconium(IV) chlorides react with bis(hydrazones) derived from 1,1′-diacetylferrocene in anhydrous THF in the presence of base to give complexes of the type [(Cp2MCl)2L] [M = Ti or Zr; LH2 = ferrocenyl bis(hydrazones)]. Tentative structures are proposed for these complexes based upon elemental analyses, electrical conductance, magnetic moment and spectroscopic data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007036131648
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  • 10
    Digitale Medien
    Digitale Medien
    Kinetics and mechanism of the interaction of thiourea with cis-diaquaethylene-diamineplatinum(II) perchlorate in aqueous medium (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 279-282 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The kinetics of the interaction of thiourea with [Pt(en)(H2O)2]2+ have been studied spectrophotometrically as a function of [Pt(en)(H2O)2]2+, [thiourea] and temperature at a particular pH(4.0), where the substrate complex exists predominantly as the diaqua species and the thiourea ligand as a neutral molecule. The reaction proceeds via a rapid outer sphere association followed by two slow consecutive steps, the second step exhibiting first order dependence on the aqua ion and thiourea concentrations. The activation parameters for both the steps have been evaluated: (ΔH 1
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007055109189
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