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  • 1
    Electronic Resource
    Electronic Resource
    Spin orientation in an exchange coupled Fe/Cr/Fe trilayer determined by polarized neutron reflection : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6295-6297 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used polarized neutron reflection to determine the layer-dependent spin orientations in an antiferromagnetically coupled 100 A(ring) Cr/50 A(ring) Fe/15 A(ring) Cr/50 A(ring) Fe/Si sandwich structure prepared by sputtering. At low field, the net Fe layer magnetic moments align in an asymmetric canted orientation with a near zero total magnetic moment for the sample. At high fields, a canted state, nearly symmetric with respect to the applied field direction is observed and the magnetization in each layer does not reach the bulk saturation value until the layers are ferromagnetically aligned. The behavior is discussed in the context of current theories of exchange coupling. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362041
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  • 2
    Electronic Resource
    Electronic Resource
    WATER BINDING OF MACROMOLECULES DETERMINED BY PULSED NMR (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pulsed NMR was applied to measure the spin-lattice (T1) and the spin-spin (T1) relaxation times of the water adsorbed on sodium alginate, pectin, corn starch, casein and cellulose. T1 was determined by means of repeated 90°-90° pulse sequences and T2 by the spin-echo method. T1 relaxation time curves for all the samples studied showed simple exponential, i.e., single phase, behavior. Plots of T1 as a function of moisture content showed minima at 0.15–0.258 water/g dry matter; plots of T1 vs water activity (Aw) yielded minima at Aw of 0.65. T2 relaxation time curves for corn starch containing more than 0.56g water/g DM exhibited two-phase behavior, indicating the existence of two water fractions of different mobility. The amount of water in the bound fraction showed a remarkable consistency (0.194 ± 0.011g water/g DM) among six samples of high moisture content. T2 was found to increase with moisture content for all the macromolecules. Cellulose showed exceptionally long T2 values compared to the other materials at the same moisture content, whereas pectin and sodium alginate showed short T2 values. These results indicated that T2 value is a measure of strength of water binding. Break points were observed in the T2-moisture curve. The moisture contents at these points corresponded to the bound water content determined by freezing and to the equilibrium moisture content at Aw of 0.9. T2 increased exponentially with Aw.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1976.tb00604.x
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  • 3
    Electronic Resource
    Electronic Resource
    WATER BINDING OF FOOD CONSTITUENTS AS, DETERMINED BY NMR, FREEZING, SORPTION AND DEHYDRATION (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The water binding properties of some common food constituents were determined by water sorption, dehydration, freezing and NMR methods. The sorption isotherms of sodium alginate, pectin, corn starch, casein and cellulose were obtained and the heats of adsorption and monolayer values were calculated. The unfreezable water contents of these five materials were determined and the values corresponded to the equilibrium moisture contents at a water activity of about 0.90. The bound water capacities of 14 food materials were determined using wide-line NMR. These values correlated closely with the tertiary moisture contents determined by a drying rate study and the equilibrium moisture contents at 100% relative humidity. The different NMR properties of free and bound water were discussed in terms of nuclear relaxation times and molecular mobilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb03483.x
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  • 4
    Electronic Resource
    Electronic Resource
    PULSED NUCLEAR MAGNETIC RESONANCE STUDY OF WATER MOBILITY IN FLOUR DOUGHS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Transverse relaxation time (T2) of water protons in wheat flour doughs, an indication of molecular mobility of water, was determined by pulsed nuclear magnetic resonance. The relaxation curves consist of two components with a long and a short T2, corresponding to a more mobile and a less mobile fraction, respectively. The less mobile fraction has a T2 of about 20 msec and accounts for about 0.62g water per g dry solid. These values seem to be independent of flour strength and mixing time. The more mobile fraction increased with moisture content and showed T, value of about 60 msec for most samples. Mixing and addition of salt to the dough resulted in reduced T2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb06449.x
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  • 5
    Electronic Resource
    Electronic Resource
    Genome scanning for resistance-gene analogs in rice, barley, and wheat by high-resolution electrophoresis (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 345-355 
    Details
    ISSN: 1432-2242
    Keywords: Key words Candidate genes ; Disease resistance genes ; Germplasm diversity ; Host-pathogen interaction ; Molecular marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Genes cloned from diverse plants for resistance to different pathogens have sequence similarities in domains presumably involved in pathogen recognition and signal transduction in triggering the defense response. Primers based on the conserved regions of resistance genes often amplify multiple fragments that may not be separable in an agarose gel. We used denaturing polyacrylamide-gel electrophoresis to detect PCR products of plant genomic DNA amplified with primers based on conserved regions of resistance genes. Depending upon the primer pairs used, 30–130 bands were detected in wheat, rice, and barley. As high as 47%, 40%, and 27% of the polymorphic bands were detected in rice, barley, and wheat, respectively, and as high as 12.5% of the polymorphic bands were detected by certain primers in progeny from a cross of the wheat cultivars ‘Stephens’ and ‘Michigan Amber’. Using F6 recombinant inbred lines from the ‘Stephens’בMichigan Amber’ cross, we demonstrated that polymorphic bands amplified with primers based on leucine-rich repeats, nucleotide-binding sites and protein kinase genes, were inherited as single loci. Linkages between molecular markers and stripe rust resistance genes were detected. This technique provides a new way to develop molecular markers for assessing the genetic diversity of germplasm based upon potential candidate resistance genes in diverse species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050905
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of ethanol on turnover and function of striatal dopamine (1979)
    Springer
    Psychopharmacology 61 (1979), S. 1-9 
    Details
    ISSN: 1432-2072
    Keywords: Ethanol ; Dopamine turnover ; Striatum ; Body turning ; Supersensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acute oral administration of ethanol increased the rate of depletion of dopamine in the striata of rats injected with α-methyl-p-tyrosine. This effect was eliminated by pretreatment with atropine or by lesioning of the striato-nigral tract. Ethanol also attenuated the inhibitory effect of apomorphine on turnover of striatal dopamine. Unilateral injection of ethanol into the neostriatum of rats followed by intraperitoneal injection of either apomorphine or amphetamine elicited marked ipsilateral head-to-tail body turning. This turning was blocked by pretreatment with haloperidol. Chronic intubation of ethanol to rats enhanced contralateral body turning elicited by unilateral intrastriatal injection of dopamine. Injection of 6-hydroxydopamine into the substantia nigra led to denervation supersensitivity of dopaminergic functions in the neostriatum. This effect was not seen in rats that were given ethanol postinjection of 6-hydroxydopamine. These results suggested that ethanol has an inhibitory effect on the nigrostriatal dopaminergic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426801
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  • 7
    Electronic Resource
    Electronic Resource
    Spread-spectrum signals and the chaotic logistic map (1999)
    Springer
    Circuits, systems and signal processing 18 (1999), S. 59-73 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Chaotic systems provide a simple means of generating deterministic signals that resemble white noise. It is this noise-like property that provides the potential for applying chaotic systems in communications. In this work, we report a detailed study of the logistic map for use as direct-sequence spread-spectrum (DS/SS) codes. The advantages of the chaotic DS/SS codes are the almost unlimited number of distinct sequences of arbitrary lengths, the ease of generating these sequences, and the increased privacy afforded by the noise-like appearance of these sequences. Some design criteria are provided from the correlation properties of these sequences, and bit-error rate (BER) results are generated by Monte Carlo simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206545
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropic transport scattering times for pure and dilute aluminium alloys (1975)
    Springer
    The European physical journal 19 (1975), S. 317-322 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ideal transport scattering times for pure Al are calculated and found to be very anisotropic. The anisotropy is a sensitive function of temperature. It is due to the Fermi surface, the multi-plane-wave character of the electronic wavefunctions, the Umklapp processes, as well as the phonon spectrum. In addition, for a magnesium impurity in Al we have computed the residual transport scattering times as well as the quasiparticle lifetimes which we then compare. The scattering time anisotropy gives rise to deviations from Matthiessen's rule in dilute alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458879
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  • 9
    Electronic Resource
    Electronic Resource
    Etching of melt-processed YBa2Cu3O7−δ for SEM image analysis (1996)
    Springer
    Journal of materials science 15 (1996), S. 1833-1835 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264069
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  • 10
    Electronic Resource
    Electronic Resource
    Modeling of the three-dimensional structure of luffin-α and its simulated reaction with the substrate oligoribonucleotide GAGA (1996)
    Springer
    The protein journal 15 (1996), S. 649-657 
    Details
    ISSN: 1573-4943
    Keywords: Ribosome-inactivating proteins ; luffin-α ; 3D structure ; neural network ; substrate interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A fundamental problem in biochemistry and molecular biology is understanding the spatial structure of macromolecules and then analyzing their functions. In this study, the three-dimensional structure of a ribosome-inactivating protein luffin-α was predicted using a neural network method and molecular dynamics simulation. A feedforward neural network with the backpropagation learning algorithm were trained on model class of homologous proteins including trichosanthin andα-momorcharin. The distance constraints for the Cα atoms in the protein backbone were utilized to generate a folded crude conformation of luffin-α by model building and the steepest descent minimization approach. The crude conformation was refined by molecular dynamics techniques and a simulated annealing procedure. The interaction between luffin-α and its analogous substrate GAGA was also simulated to understand its action mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01886747
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