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  • Springer  (51)
  • 1995-1999  (51)
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  • 1995  (51)
  • 1
    Electronic Resource
    Electronic Resource
    Lattice path counting andM/M/c queueing systems (1995)
    Springer
    Queueing systems 19 (1995), S. 193-214 
    Details
    ISSN: 1572-9443
    Keywords: M/M/c queue ; transient solution ; lattice path counting ; depth of path
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We apply the lattice path counting method to the analysis of the transientM/M/c queueing system. A closed-form solution is obtained for the probability of exactlyi arrivals andj departures within a time interval of lengtht in anM/M/c queueing system that is empty at the initial time. The derivation of the probability is based on the counting of paths from the origin to(i,j) on thexy-plane, that have exactly rd x-steps whose depth from the liney=x isd (d=0,1,...,c−1). The closed-form solution has an expression useful for numerical calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01148946
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  • 2
    Electronic Resource
    Electronic Resource
    AnM/M/s-consistent diffusion model for theGI/G/s queue (1995)
    Springer
    Queueing systems 19 (1995), S. 377-397 
    Details
    ISSN: 1572-9443
    Keywords: GI/G/s queues ; diffusion model ; conditional departure process ; renewal-process approximations ; consistent discretization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper develops a diffusion-approximation model for a stableGI/G/s queue: The queue-length process in theGI/G/s queue is approximated by a diffusion process on the nonnegative real line. Some heuristics on the state space and the infinitesimal parameters of the approximating diffusion process are introduced to obtain an approximation formula for the steady-state queue-length distribution. It is shown that the formula is consistent with the exact results for theM/M/s andM/G/∞ queues. The accuracy of the approximations for principal congestion measures are numerically examined for some particular cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151930
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  • 3
    Electronic Resource
    Electronic Resource
    On operad structures of moduli spaces and string theory (1995)
    Springer
    Communications in mathematical physics 171 (1995), S. 1-25 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We construct a real compactification of the moduli space of punctured rational algebraic curves and show how its geometry yields operads governing homotopy Lie algebras, gravity algebras and Batalin-Vilkovisky algebras. These algebras appeared recently in the context of string theory, and we give a simple deduction of these algebraic structures from the formal axioms of conformal field theory and string theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02103769
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  • 4
    Electronic Resource
    Electronic Resource
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Keywords: Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Spontaneous rhythmically bursting activity was recorded from the trigeminal, vagal and hypoglossal nerve roots of the isolated brainstem from the frogsRana catesbeiana andRana pipiens superfused with a bicarbonate-free HEPES-buffer solution. Burst frequency, burst duration and the activity profile of the spontaneous neural discharges in vitro resembled those of a less radical preparation, the decerebrate, fictively breathing frog. After complete midsagittal section, each half of the isolated brainstem generated its own rhythmic neural activity which resembled that of the intact isolated brainstem. The spontaneous activity generated within each half of the brainstem is probably coordinated by decussating axons or by groups of neurons located along the midline of the brainstem. Our results suggest that these coordinating entities extend the length of the brainstem (in a rostro-caudal dimension) and the degree of contact rather than the location of the contact between the two halves of the brainstem determines the synchronization of the right and left halves. Burst frequency of both the intact and hemisected brainstem preparation was decreased by alkaline challenge and increased by acid challenge. We conclude that this endogeneous rhythmic activity represents the efferent motor output underlying lung ventilation in these animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021590
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  • 5
    Electronic Resource
    Electronic Resource
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Keywords: Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Spontaneous rhythmically bursting activity was recorded from the trigeminal, vagal and hypoglossal nerve roots of the isolated brainstem from the frogs Rana catesbeiana and Rana pipiens superfused with a bicarbonate-free HEPES-buffer solution. Burst frequency, burst duration and the activity profile of the spontaneous neural discharges in vitro resembled those of a less radical preparation, the decerebrate, fictively breathing frog. After complete midsagittal section, each half of the isolated brainstem generated its own rhythmic neural activity which resembled that of the intact isolated brainstem. The spontaneous activity generated within each half of the brainstem is probably coordinated by decussating axons or by groups of neurons located along the midline of the brainstem. Our results suggest that these coordinating entities extend the length of the brainstem (in a rostro-caudal dimension) and the degree of contact rather than the location of the contact between the two halves of the brainstem determines the synchronization of the right and left halves. Burst frequency of both the intact and hemisected brainstem preparation was decreased by alkaline challenge and increased by acid challenge. We conclude that this endogeneous rhythmic activity represents the efferent motor output underlying lung ventilation in these animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192499
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  • 6
    Electronic Resource
    Electronic Resource
    Improvement of S-adenosylmethionine production by integration of the ethionine-resistance gene into chromosomes of the yeast Saccharomyces cerevisiae (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 730-733 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  An ethionine-resistance gene cloned from Saccharomyces cerevisiae DKD-5D-H was able to enhance S-adenosyl-L-methionine (AdoMet) accumulation when it was introduced into the yeast cells on multi-copy plasmid YEp13. In order to increase the AdoMet accumulation, the gene was integrated into the yeast chromosome by using a yeast transposon Ty element. When the YEp plasmid was used for the integration, the ethionine-resistance gene was efficiently inserted into the yeast chromosomes with a substantial increase in AdoMet productivity (about twofold) in comparison with that by the yeast cells carrying the gene on an extrachromosomal multi-copy plasmid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050322
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  • 7
    Electronic Resource
    Electronic Resource
    Cloning of Corticium rolfsii glucoamylase cDNA and its expression in Saccharomyces cerevisiae (1995)
    Springer
    Applied microbiology and biotechnology 44 (1995), S. 451-458 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A cDNA coding for the glucoamylase of Corticium rolfsii AHU 9627 was cloned using synthetic oligonucleotide probes that code for inner amino acid sequences of the purified enzyme. This clone (CG 15) is 1900 base pairs long and contains the entire coding region for a polypeptide of 579 residues. Comparison with amino acid sequences of other fungal glucoamylases showed homologies of 35%–56%, and most homology with that of Aspergillus niger. The expression plasmid pACG 115 was constructed by introduction of the coding region of CG 15 into a yeast expression vector pAAH 5, containing the promoter and terminator of alcohol dehydrogenase (ADH1). Saccharomyces cerevisiae AH 22, containing the recombinant plasmid pACG 115, acquired starch-saccharifying ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00169943
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  • 8
    Electronic Resource
    Electronic Resource
    Improvement of S-adenosylmethionine production by integration of the ethionine-resistance gene into chromosomes of the yeast Saccharomyces cerevisiae (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 730-733 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An ethionine-resistance gene cloned from Saccharomyces cerevisiae DKD-5D-H was able to enhance S-adenosyl-l-methionine (AdoMet) accumulation when it was introduced into the yeast cells on multi-copy plasmid YEp13. In order to increase the AdoMet accumulation, the gene was integrated into the yeast chromosome by using a yeast transposon Ty element. When the YEp plasmid was used for the integration, the ethionine-resistance gene was efficiently inserted into the yeast chromosomes with a substantial increase in AdoMet productivity (about twofold) in comparison with that by the yeast cells carrying the gene on an extrachromosomal multi-copy plasmid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171953
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  • 9
    Electronic Resource
    Electronic Resource
    Cloning of Corticium rolfsii glucoamylase cDNA and its expression in Saccharomyces cerevisiae (1995)
    Springer
    Applied microbiology and biotechnology 44 (1995), S. 451-458 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A cDNA coding for the glucoamylase of Corticium rolfsii AHU 9627 was cloned using synthetic oligonucleotide probes that code for inner amino acid sequences of the purified enzyme. This clone (CG 15) is 1900 base pairs long and contains the entire coding region for a polypeptide of 579 residues. Comparison with amino acid sequences of other fungal glucoamylases showed homologies of 35% – 56%, and most homology with that of Aspergillus niger. The expression plasmid pACG 115 was constructed by introduction of the coding region of CG 15 into a yeast expression vector pAAH 5, containing the promoter and terminator of alcohol dehydrogenase (ADH1). Saccharomyces cerevisiae AH 22, containing the recombinant plasmid pACG 115, acquired starch-saccharifying ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050581
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  • 10
    Electronic Resource
    Electronic Resource
    Mval polymorphism in the proteolipid protein (PLP) gene (1995)
    Springer
    Human genetics 〈Berlin〉 95 (1995), S. 461-461 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We report a rare polymorphism in the human proteolipid protein (PLP) gene. A synonymous mutation, 168 A→G, was detected in exon 2 of the PLP gene. Mutations in this gene have been reported in some cases of Pelizaeus-Merzbacher disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00208978
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