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  • Springer  (113)
  • 1995-1999  (113)
  • 1980-1984
  • 1960-1964
  • 1935-1939
  • 1920-1924
  • 1999  (62)
  • 1995  (51)
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  • 1995-1999  (113)
  • 1980-1984
  • 1960-1964
  • 1935-1939
  • 1920-1924
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Structural study of fucoidan from Cladosiphon okamuranus tokida (1999)
    Springer
    Glycoconjugate journal 16 (1999), S. 19-26 
    Details
    ISSN: 1573-4986
    Schlagwort(e): fucoidan ; sulfated fucan ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A structural study was carried out on a fucoidan isolated from the brown seaweed Cladosiphon okamuranus. The polysaccharide contained fucose, glucuronic acid and sulfate in a molar ratio of about 6.1 : 1.0 : 2.9. The results of Smith degradation showed that this polysaccharide has a linear backbone of 1→3-linked α-fucopyranose with a half sulfate substitution at the 4-positions, and a portion of the fucose residues was O-acetylated. The data obtained from partial acid hydrolysis, a methylation analysis and NMR spectra indicated that the α-glucuronic acid residue is linked to the 2-positions of the fucose residues, which were not substituted by a sulfate group. These results indicated that the average structure of this fucoidan is as follows: -[(→3Fuc-4(±OSO3-)α1−)5→3[GlcAα1→2]Fucα1−]n−. (Half of each fucose residue was sulfated. One O-acetyl ester was present in every 6 fucose residues.)
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006945618657
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Blue Luminescence from Silicon Nanoparticles Suspended in Organic Liquids (1999)
    Springer
    Journal of cluster science 10 (1999), S. 359-380 
    Details
    ISSN: 1572-8862
    Schlagwort(e): Silicon ; nanoparticles ; luminescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We have prepared several nanometer-sized silicon colloids in organic liquids in the range from 3.7 to 9.8 nm with a constant weight density of 1 mg/ml by a gas evaporation technique. The blue–green luminescent energy was found to be independent of size, in contrast to its intensity and optical absorption, which showed a clear size effect. Special emphasis is placed on the advantage of using a colloidal system: controllability of mass density in a unit volume, isolation of each particle, selection of wide band-gap substances, capability of absolute quantum efficiency, and easy surface modification. As an example of the above advantages, we have determined the absolute quantum yield as a function of size. From the quantum yield thus derived and the proposed model that combines surface as well as volume effects, experimentally obtained parameters such as the diffusion velocity of an electron–hole pair and the initial flight distance of this pair are found to be consistent with those obtained from other data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021981714227
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  • 3
    Digitale Medien
    Digitale Medien
    Lattice path counting andM/M/c queueing systems (1995)
    Springer
    Queueing systems 19 (1995), S. 193-214 
    Details
    ISSN: 1572-9443
    Schlagwort(e): M/M/c queue ; transient solution ; lattice path counting ; depth of path
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01148946
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  • 4
    Digitale Medien
    Digitale Medien
    AnM/M/s-consistent diffusion model for theGI/G/s queue (1995)
    Springer
    Queueing systems 19 (1995), S. 377-397 
    Details
    ISSN: 1572-9443
    Schlagwort(e): GI/G/s queues ; diffusion model ; conditional departure process ; renewal-process approximations ; consistent discretization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01151930
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  • 5
    Digitale Medien
    Digitale Medien
    Vector model analysis in nondestructive imaging by using the photothermal deflection methods (1999)
    Springer
    Applied physics 69 (1999), S. 343-346 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 78.20.Hp; 42.30.Va; 65.90.+i
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract. The noncontact imaging of the buried structures is carried out in the open-air atmosphere by using the photothermal deflection (PTD) method. We applied these techniques to the layered samples. Besides the PTD images for the optically opaque buried structures, the parameters of the materials such as thermal diffusivity can also be calculated from the PTD amplitude and phase signal in the PTD scanning images. When the PTD signals at two different modulation frequencies are used, the thermal diffusivity of the buried structure can be obtained from the PTD signal outside of the sample nondestructively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390051011
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  • 6
    Digitale Medien
    Digitale Medien
    Tissue Distribution of Methylsulfonyl Metabolites Derived from 2,2′,4,5,5′-Penta- and 2,2′,3,4′,5′,6-Hexachlorobiphenyls in Rats (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 135-142 
    Details
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract. The time courses of fecal excretion and tissue distribution of metabolites derived from 2,2′,4,5,5′-pentachlorobiphenyl (CB101) and 2,2′,3,4′,5′,6-hexachlorobiphenyl (CB149) were investigated in male Wistar rats. The metabolism of both congeners involved primarily hydroxylation at the 3-position, and methylthiolation at the 4-position. Metabolites distributed in tissue were dominated by different ratios of 3- and 4-methylsulfonyl (MeSO2) metabolites. The 3-/4-MeSO2 metabolite ratios in liver and adipose tissue for both congeners were 0.41–0.61 at day 4, and then increased to 0.85–1.00 for up to day 42. In contrast, the ratios in lung were 0.03–0.04, and then decreased to 0.01. Compared to the unchanged PCBs at day 42, the distribution ratios of 3-MeSO2 metabolites were greater in the order of liver (0.46 for CB101 and 0.21 for CB149) 〉 kidney 〉 blood 〉 lung 〉 adipose tissue, whereas those of 4-MeSO2 metabolites were in the order of lung (9.50 for CB101 and 4.00 for CB149) 〉 kidney 〉 blood 〉 liver 〉 adipose tissue, indicating the different binding affinity of 3-MeSO2 metabolites in liver from that of 4-MeSO2 metabolites in lungs of rats. Furthermore, the structure-tissue affinity relationship for 3-MeSO2 metabolites was investigated, following the administration of 11 3-MeSO2-PCB congeners to rats. The results indicated that the retention potential of 3-MeSO2 metabolites in the liver largely depends on the ortho-chlorine substitution in the biphenyl ring rather than the degree of chlorination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002449900498
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  • 7
    Digitale Medien
    Digitale Medien
    On operad structures of moduli spaces and string theory (1995)
    Springer
    Communications in mathematical physics 171 (1995), S. 1-25 
    Details
    ISSN: 1432-0916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02103769
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  • 8
    Digitale Medien
    Digitale Medien
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01021590
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  • 9
    Digitale Medien
    Digitale Medien
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00192499
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  • 10
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002530050322
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