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  • 1
    Electronic Resource
    Electronic Resource
    Complex Carbohydrate Composition of Large Dense-Cored Vesicles from Sympathetic Nerve (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 49 (1987), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Highly purified noradrenergic, large, dense-cored vesicles were isolated from bovine sympathetic nerve endings by sucrose-D2O density gradient centrifugation. Their concentration of glycoprotein hexosamine and sialic acid was 6.6 and 3.9 μmol/100 mg lipid-free dry weight, respectivly. values which are similar to those previously found in vine chromaffin granules. However, whereas chromaffin granule glycoproteins are characterized by their high proportion of N-acetylgalactosamine-containing O-glycosidically-linked oligosaccharides (present in the chromo-granins), such oligosaccharides accounted for only 17% of those in noradrenergic synaptic vesicle glycoproteins. Fractionation of N-3H-acetylated glycopeptides by sequential lectin affinity chromatography demonstrated that approxi-mtely two-thirds of the oligosaccharides were of the triand tetraantennary complex type, accompanied by 14% biantennary oligosaccharides and 3% high-mannose oligosaccharides. The vesicles had a relatively low concentration of chondroitin sulfate (less than 5% of that in chromaffin granules) but significant amounts of heparan sulfate (0.4 μmol N-acetylglucosamine/100 mg lipid-free dry weight). No hyaluronic acid was detected. The concentration of ganglioside sialic acid in the noradrenergic vesicles was approximately 1 μmol/100 mg lipid-free dry weight, which is significantly higher than that of a crude membrane mixture from which the vesicles were prepared; the ratio of N-acetyl-to N-glycolylneuraminic acid was 0.8. Several molecular species of gangliosides were detected by thin-layer chromatography, but most of these did not exactly comigrate with bovine brain gangliosides. Cholera toxin binding indicated that approximately half or less of the gangliosides belong to the gangliotetraose series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1987.tb02445.x
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  • 2
    Electronic Resource
    Electronic Resource
    Density functional theory of nonuniform colloidal suspensions: 3D density distributions and depletion forces (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 5421-5431 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a density functional approach for inhomogeneous charge-stabilized colloidal suspensions which is based on the hybrid weighted-density approximation. Making use of an analytic expression recently proposed for the free energy of the homogeneous system, a free energy functional for the inhomogeneous fluid can be found that is particularly easy to evaluate numericalLY because of the explicit nature of its input functions. Due to this numerical efficiency our calculation can be extended to relatively large three dimensional systems. After performing various explicit tests of our model we consider the case of two large hard spheres immersed in the suspension and calculate from the 3D density distribution of the fluid the effective pair potential between the spheres. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478437
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of binary colloidal mixtures of charged and uncharged spherical particles (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 2913-2920 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00048a012
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of modes in dynamic scattering from ternary polymer mixtures and interdiffusion (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 4408-4422 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00015a025
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  • 5
    Electronic Resource
    Electronic Resource
    On the discrimination of dipole background from four blade photon BPMs for insertion devices : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3367-3367 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The position response of blade monitors is mainly determined by their spectral sensitivity for low energy photoelectrons. For insertion devices with high energy first harmonics, the signals are contaminated by the light from the upstream and downstream bending magnets. A blade monitor design using energy selective detection of the photoelectrons from the blades will be presented. This way the background signals from the dipoles can be supressed and only position information from the insertion device beam can be obtained. A simulation code and experimental results at BESSY I will be presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147365
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement and calculation of the spatial and spectral distribution of wavelength shifter radiation at BESSY (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 653-657 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Calculable synchrotron radiation (SR) from BESSY dipole magnets has been used by PTB for radiometry from the visible to the soft x-ray region with very low uncertainties for many years. The use of wavelength shifter (WLS) radiation bears the potential of extending the usable spectral range for radiometry with calculable SR to higher photon energies. Initial investigations on the feasibility of this approach have been performed: an energy dispersive high-purity germanium detector (HPGe) was used to characterize the radiation of the new BESSY WLS with a magnetic field of B=3.2 T. The HPGe detector has previously been calibrated and so the absolute spectral photon flux could be determined. The measured spectral photon flux was then compared to calculations and good agreement was found in the order of ±5%. Although this is to our knowledge the best agreement demonstrated so far for an absolute comparison of measured WLS radiation to calculations, further improvements are needed for a future radiometric use of WLS radiation. This will be discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146836
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of interface traps in metal-oxide-semiconductor devices during isochronal annealing after irradiation at 78 K (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7434-7442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the mechanisms of interface trap (Nit) formation in metal-oxide-semiconductor devices during isochronal annealing after irradiation at 78 K. Two distinct Nit formation processes are observed at 120 and 250 K. After irradiation but before annealing, some samples were injected with electrons to remove all the radiation-induced positive oxide charges. In these samples, the Nit formation process at 250 K is nearly eliminated, in agreement with previous reports, but the lower-temperature 120 K process increases substantially. Results are explained using a hydrogen model. We also discuss the use of substrate hot-electron injection, which is used to annihilate the radiation-induced positive charge, in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349739
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  • 8
    Electronic Resource
    Electronic Resource
    On self-diffusion in a water-in-oil microemulsion (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2990-2998 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The self-diffusion coefficient Ds is calculated to first order in volume fraction for a water-in-oil microemulsion model. Assuming spherical droplets, the interaction consists of hard-core repulsions, an attractive square-well potential due to overlapping surfactant tails, and hydrodynamic interactions. The latter are described by high-order series expansions outside the range of the attractive potential, whereas simplifying assumptions are made inside the range of overlapping. Within this model, expressions for Ds are derived in terms of the depth V0 of the attractive potential, the ratio of the range of overlapping to the radius of the hard cores, and a parameter describing the hydrodynamic interaction. Assuming a linear relation between V0 and the droplet radius the initial slope of Ds vs the volume fraction becomes more negative when V0 increases. A similar behavior is found if V0 increases at constant droplet radius. These results are compared to those obtained without hydrodynamic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453035
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  • 9
    Electronic Resource
    Electronic Resource
    The pair-distribution function and light-scattered intensities for charged rod-like macromolecules in solution (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3008-3015 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The pair-distribution function of charged rods in a dilute solution is studied for several rod lengths and charges. The interaction energy in the Monte Carlo simulations is a sum over screened Coulomb potentials of beads, which constitute the rod. Two or three beads per rod were used. For short rods a perturbation theory is given to obtain an analytic expression for the pair-distribution function. There is a good agreement between this perturbation theory and the Monte Carlo simulations. These results are then used to calculate the polarized and depolarized structure factors for thin charged rods with an anisotropic polarizability. It turns out that the static structure factors are essentially independent of the magnitude of the anisotropic polarizability in the range which is experimentally accessible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453037
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  • 10
    Electronic Resource
    Electronic Resource
    Electrolyte friction on charged spherical macroparticles: Beyond the Debye–Hückel limit (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2976-2985 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The contribution to the friction coefficient of a charged spherical polyion diffusing in an ionic solution due to its interactions with the electrolyte ions is calculated, in the absence of hydrodynamic interactions, starting from a formal expression for ζel previously derived by Medina-Noyola and Vizcarra-Rendón. It is shown that such a formal expression can be given a particularly simple form in terms of the equilibrium distribution neqi(r) of the small ions around the tracer, which allows us to study effects ignored in Debye–Hückel level theories. We consider, for example, the effect of a finite size of the small ions and nonlinear contributions to ζel on the polyion charge. We show that the correct Debye–Hückel limit differs from Schurr's result for ζel, and the source of the disagreement is clearly exposed. The results derived here for ζel are not restricted in the number of species of electrolyte ions or in their charges or mobilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452051
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