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  • gene family  (3)
  • Key words piezothermoelasticity  (2)
  • all-optical networks  (2)
  • soybean  (2)
  • Springer  (8)
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  • Springer  (8)
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  • 1
    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
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    An exact axisymmetric solution for a simply supported piezoelectric cylindrical shell (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 260-273 
    Details
    ISSN: 1432-0681
    Schlagwort(e): Key words piezothermoelasticity ; cylindrical shell ; piezoelectric ; axisymmetry.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary Three-dimensional axisymmetric solution is presented for a simply supported piezoelectric cylindrical shell. The variables are expanded in Fourier series to satisfy the boundary conditions at the ends. The solution of the governing differential equations with variable coefficients is constructed as a product of an exponential function and a power series. The coefficients of terms of all degrees in the governing equations are set to zero, yielding a characteristic equation for the exponent and recursive relations for the coefficients of the power series. Results are presented illustrating the effect of thickness parameter of the shell. An inverse problem of inferring the applied temperature from the measured potential difference has been solved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004190050116
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Three-dimensional solution for a hybrid cylindrical shell under axisymmetric thermoelectric load (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 320-330 
    Details
    ISSN: 1432-0681
    Schlagwort(e): Key words piezothermoelasticity ; cylindrical shell ; exact solution ; laminate ; axisymmetry ; cross-ply.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary An exact axisymmetric piezothermoelastic solution is presented for a simply-supported hybrid cylindrical shell made of cross-ply composite laminate and piezoelectric layers. Numerical results for hybrid shells are presented for sinusoidal and central band thermal and electrical loads. The effect of the loading, the radius-to-thickness ratio, the span-to-radius ratio and the number of layers of the substrate on the response is investigated. The interface between the substrate and the actuated piezoelectric layer has been found to be subjected to high shear stress. It has been shown that the maximum values of the deflection and the stresses, due to thermal load, can be appreciably reduced by appropriate application of actuation potential.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004190050120
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  • 4
    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
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Two classes of differentially regulated glutamine synthetase genes are expressed in the soybean nodule: a nodule-specific class and a constitutively expressed class (1993)
    Springer
    Plant molecular biology 22 (1993), S. 971-983 
    Details
    ISSN: 1573-5028
    Schlagwort(e): cDNA sequence ; gene family ; glutamine synthetase ; soybean nodules ; cotyledons ; hybrid-select translation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We have characterized two sets of cDNA clones representing the glutamine synthetase (GS) mRNA in soybean nodules. Using the 3′-untranslated regions of a representative member of each set, as gene member(s) specific probes, we have shown that one set of the GS genes are expressed in a nodule-specific manner, while the other set is expressed in other tissues, besides the nodules. The nodule-specific GS genes are expressed in a developmentally regulated manner in the nodules, independent of the onset of nitrogen fixation. The other class of GS genes is expressed constitutively in all tissues tested, but its expression level is dramatically enhanced in nodules following onset of N2 fixation. The latter set of genes is also expressed in cotyledons of germinating seedlings in a developmentally regulated manner. Analysis of hybrid select translation products and genomic Southern blots suggests that multiple gene members in each class are expressed in the nodules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028970
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization of a novel nodulin gene in soybean that shares sequence similarity to the gene for nodulin-24 (1990)
    Springer
    Plant molecular biology 15 (1990), S. 835-849 
    Details
    ISSN: 1573-5028
    Schlagwort(e): soybean ; nodulin ; gene organization ; hybrid select translation ; gene family ; developmental regulation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A gene encoding for nodulin-16 (N-16) was isolated from a soybean genomic library. Nucleotide sequence analysis of the cDNA and the genomic clone of N-16 indicated that the coding region of this gene is 330 bp long and is interrupted by a single intron of 494 bp. The coding region of the N-16 gene shows a high degree of localized sequence similarity with the coding sequence of soybean nodulin-24 (N-24). Sequence similarity between the two genes is limited to the coding region of 90 bp in the first exon and the first 54 bp in the second exon of the N-16 gene which is repeated as the 2nd, 3rd, and 4th exons in the N-24 gene. The N-24 gene has been postulated to be a result of repeated duplication of an insertion element consisting of the 54 bp exon and the flanking intron sequences. In the absence of sequence similarity in the regions flanking the 54 bp sequence between the N-16 and N-24 genes, the N-16 gene does not appear to be the ancestral gene. Both N-16 and N-24 have a similar hydrophobic amino terminal end suggesting that N-16 like N-24 is targeted to the peribacteroid membrane. Southern analysis of soybean genomic DNA shows the presence of other related sequences to the N-16 gene, one of which is found to be closely linked to it. Analysis of the temporal accumulation of the N-16 transcripts during nodule development in effective and ineffective nodules suggests that N-16 and related genes might differ from leghemoglobin and some other late nodulin genes in their mechanism of regulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00039424
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    The nodulin 24 protein family shows similarity to a family of glycine-rich plant proteins (1992)
    Springer
    Plant molecular biology 18 (1992), S. 607-610 
    Details
    ISSN: 1573-5028
    Schlagwort(e): soybean ; nodulin ; glycine-rich protein
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00040679
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Down-regulation of specific members of the glutamine synthetase gene family in alfalfa by antisense RNA technology (1998)
    Springer
    Plant molecular biology 37 (1998), S. 535-547 
    Details
    ISSN: 1573-5028
    Schlagwort(e): alfalfa ; antisense ; gene family ; glutamine synthetase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Glutamine synthetase (GS) catalyzes the ATP-dependent condensation of NH3 with glutamate to produce glutamine. In plants GS is an octameric enzyme and is located either in the cytoplasm (GS1) or in the chloroplast (GS2). Two distinct classes of GS1 genes with unique 3′-untranslated region (3′UTR) have been identified in alfalfa. We have demonstrated that the two classes exhibit differential expression pattern in the different plant organs suggesting different functional roles for the different isozymes. To determine the functional significance ofss the two classes of GS1 genes in alfalfa, we have utilized antisense gene constructs aimed specifically at the 3′UTR of the two GS1 genes and introduced them individually into alfalfa. Our data show that the gene constructs are effective in lowering the corresponding transcript level very effectively though there were organ-specific differences in the level of reduction. No transcript corresponding to the antisense gene construct was detected in any of the alfalfa transformants though they accumulated to significant levels in transgenic tobacco containing the same construct. This suggests that the antisense transcript was not stable in the presence of the homologous target sequence. Transgenic alfalfa with up to 80% reduction in the transcript level corresponding to each gene class, however, showed no reduction in GS activity or GS1 polypeptide level. The results suggest that GS1 mRNA levels are not rate-limiting for GS1 polypeptide synthesis and that GS1 levels are controlled both at the transcriptional and translational/post-translational level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006099512706
    Standort Signatur Erwartet Verfügbarkeit
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