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  • 1
    Electronic Resource
    Electronic Resource
    Location of ecdysteroid 22-O-acyltransferase in the larvae ofHeliothis virescens (1994)
    Springer
    Entomologia experimentalis et applicata 70 (1994), S. 263-272 
    Details
    ISSN: 1570-7458
    Keywords: tobacco budworm ; Heliothis virescens ; Noctuidae ; epithelial cell ; brush border membrane ; ecdysteroids ; metabolism ; acyltransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larvae of the tobacco budworm,Heliothis virescens, are resistant to high levels of ingested 20-hydroxyecdysone which could cause potential inhibition to the development of many other lepidopteran species. This resistance is attributed to the ability of the larvae to metabolize this molting hormone to its 22-acyl ester forms. When tobacco budworm larvae were fed large quantities of 20-hydroxyecdyone, the hormonal metabolites were found in gut and fat body tissues. When incubated with 20-hydroxyecdysone gut tissue converted 20-hydroxyecdysone into its 22-acyl ester metabolites. Lumen site of the midgut was found to be the major location of this bio-transformation. In contrast, fat body tissue failed to convert 20-hydroxyecdysone to 22-acyl ester metabolitesin vitro. After the oral injection of3H-ecdysone, the major metabolites formed were ecdysone 22-acyl esters whereas the majority of3H-ecdysone was transformed to polar metabolites after it was injected into the hemocoel of the larvae. Similar distributions of ecdysteroid 22-O-acyltransferase and alkaline phosphatase activity in subcellular fractions demonstrates the co-localization of these enzymes in plasma membrane of the gut epithelial cells. These results suggest that gut brush border membrane is the major site of ecdysteroid 22-acyl ester formation inH. virescens larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380560
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  • 2
    Electronic Resource
    Electronic Resource
    How to find the Lax pair from the Yang-Baxter equation (1991)
    Springer
    Communications in mathematical physics 141 (1991), S. 523-531 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We show explicitly how to construct the quantum Lax pair from the Yang-Baxter equation. We demonstrate the new method by applying it to the Heisenberg XYZ model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02102813
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidation of single-phase Pb-In alloys (1990)
    Springer
    Oxidation of metals 33 (1990), S. 301-308 
    Details
    ISSN: 1573-4889
    Keywords: Pb-In alloys ; oxidation ; oxide-inversion layer ; Auger analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of several single-phase Pb-In alloys has been studied in air at room temperature using AES (Auger electron spectroscopy) combined with sputter-depth profiling. Alloy samples with indium composition between 3 and 64 at.% In, which were prepared using a microtome, were oxidized in air. The oxidation of alloys with low In contents was found to be the same as that of Pb-2.9 at.% Sn.1 Increasing the bulk composition of In increased the ratio of oxidized In to oxidized Pb in the oxide mixture, although Pb oxide was observed even on the surface of the oxide for samples up to 64 at.% In. The oxidation behavior of Pb-In alloys can be explained in terms of preferential oxidation of In due to its much greater affinity for oxygen than Pb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00667419
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation kinetics of a Pb-64 at.% in single-phase alloy (1991)
    Springer
    Oxidation of metals 36 (1991), S. 465-474 
    Details
    ISSN: 1573-4889
    Keywords: Pb-In alloy ; oxidation ; logarithmic and parabolic kinetics ; short-circuit diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The solid-state oxidation kinetics of a Pb-64 at. % In (50 wt. %) single-phase alloy were studied from room temperature to 150°C using an AES (Auger Electron Spectroscopy) depth profiling technique. The general oxidation behavior of this alloy is different from that of a Pb-3 at.% In alloy but similar to that of a Pb-30 at.% In alloy. The oxide formed on this alloy is almost pure In oxide (In2O3) with the possible existence of some In suboxide near the oxide/alloy interface. At room temperature, oxidation of the alloy follows a direct logarithmic law, and the results can be described by the model proposed previously by Zhang, Chang, and Marcotte. At temperatures higher than 75° C, rapid oxidation occurred initially followed by a slower parabolic oxidation at longer time. These data were described quantitatively by the model which assumes the existence of short-circuit diffusion in addition to lattice diffusion in the oxide as proposed by Smeltzer, Haering, and Kirkaldy. The effects of alloy composition on the oxidation kinetics of (Pb, In) alloy are also examined by comparing the data for Pb-3, 30, and 64 at. % In alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151592
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  • 5
    Electronic Resource
    Electronic Resource
    Interface characteristics and mechanical properties of carbon fibre reinforced copper composites (1991)
    Springer
    Journal of materials science 26 (1991), S. 5762-5766 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Interface characteristics of carbon fibre reinforced copper matrix composites materials with various interface states and their effect on the flexural strength of composites have been studied. Interfacial states are mechanical bonding, dissolution bonding and reaction bonding. To a certain extent, raising the interfacial strength enables an increase in the flexural strength due to prevention of carbon fibre being pulled out under low stress during fracture process of composites. Raising the interfacial bondage strength, causes the brittleness of composites to increase; the fracture surface of composites is converted from a fibre pull-out model to a fibre even model. While strengthening the interface bondage, the extent of chemical reaction and dissolution at the interface must be controlled to avoid degrading the carbon fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01130112
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  • 6
    Electronic Resource
    Electronic Resource
    Automatic delineation of drainage basins within digital elevation data using the topographic primal sketch (1990)
    Springer
    Mathematical geology 22 (1990), S. 189-209 
    Details
    ISSN: 1573-8868
    Keywords: artificial intelligence ; topographic analysis ; image analysis ; drainage networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract A new technique for automatic delineation of drainage basin perimeters within digital elevation data is described which applies the topographic primal sketch to digital terrain data, and is much more natural and much more efficient than usual methods that rely upon moving a window over the array of data. This method is able to find drainage channels, mark water flow direction, and recover drainage basin areas. Results appear to be comparable to drainage patterns which can be interpreted visually from contours of the elevation data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00891823
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  • 7
    Electronic Resource
    Electronic Resource
    The nonuniform hard-rod fluid revisited (1991)
    Springer
    Journal of statistical physics 63 (1991), S. 1191-1202 
    Details
    ISSN: 1572-9613
    Keywords: Hard-rod fluid ; nonuniform ; variational principle ; Wiener-Hopf factorization ; scaled particle theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The statistical mechanics of the one-dimensional nonuniform pure hard-core fluid is formulated in the spirit of the Reiss-Frisch-Lebowitz (RFL) scaled particle theory. By emphasizing the importance of the core dependence, a more intuitive and simpler derivation can be given. The Wiener-Hopf-type construction of the pair direct correlation function is formulated via the Dyson variational method of inverse scattering theory, which is compared with the particle-hole theory. The new approach allows us to lift the global free energy functional into a larger space where all the symmetries become apparent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030006
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  • 8
    Electronic Resource
    Electronic Resource
    Genome mapping by random anchoring: A discrete theoretical analysis (1993)
    Springer
    Journal of statistical physics 73 (1993), S. 611-623 
    Details
    ISSN: 1572-9613
    Keywords: Human genome project ; random DNA clone mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As a part of the international human genome project, large-scale genomic maps of human and other model organisms are being generated. More recently, mapping using various anchoring (as opposed to the traditional “fingerprinting”) strategies have been proposed based largely on mathematical models. In all of the theoretical work dealing with anchoring, an anchor has been idealized as a point on a continuous, infinite-length genome. In general, it is not desirable to make these assumptions, since in practice they may be violated under a variety of actual biological situations. Here we analyze a discrete model that can be used to predict the expected progress made when mapping by random anchoring. By virtue of keeping all three length scales (genome length, clone length, and probe length) finite, our results for the random anchoring strategy are derived in full generality, which contain previous results as special cases and hence can have broad application for planning mapping experiments or assessing the accuracy of the continuum models. Finally, we pose a challenging nonrandom anchoring model corresponding to a more efficient mapping scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054342
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  • 9
    Electronic Resource
    Electronic Resource
    Compositional studies of high-temperature coal tar by GC/FTIR analysis of light oil fractions (1992)
    Springer
    Chromatographia 33 (1992), S. 138-146 
    Details
    ISSN: 1612-1112
    Keywords: Capillary gas chromatography ; High-temperature coal tar ; Fourier transform infrared ; Retention index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for determination of the composition of the light oil fractions in high-temperature coal tar by means of distillation, followed by gas chromatography on a crosslinked fused-silica, capillary column coated with optimum amount of stationary phase and identification by capillary gas chromatography/Fourier transform infrared spectrometry combined with GC retention indices (GC/FTIR-RI) is described. This method was effectively used to identify complex mixture such as coal tar without any standard samples, especially, adapted for isomeric compounds. More than 60 and 50 compounds were also separated and identified respectively in light oil fractions. This shows the capability of the capillary GC/FTIR combined with GC retention indices to identify isomers not accomplished by GC/MS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02275894
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  • 10
    Electronic Resource
    Electronic Resource
    Trace analysis of organics in aqueous samples by concentration in plastic tubing and multiplex gas chromatography (1994)
    Springer
    Chromatographia 39 (1994), S. 294-298 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Preconcentration ; Thermal modulator ; Cross-correlation ; Trace analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The inside wall of an uncoated polyethylene capillary traps organic substances from a water sample pumped through it by a nitrogen gas stream. Heating the capillary in a chromatographic oven slowly releases the trapped organic substances from the wall. Nitrogen carrier gas transports sample substances released through a thermal desorption modulator and onto a chromatographic column. Pulsing the temperature of the modulator modulates the concentrations of sample components as they enter the column. Computing the cross correlation of the detector output signal against the applied modulation signal generates the chromatogram. Detection limits below 1 ppb are possible using a flame ionization detector. No sample pretreatment or cold trap is required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274516
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