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  • 1
    Electronic Resource
    Electronic Resource
    Protein Transport Across the Eukaryotic Endoplasmic Reticulum and Bacterial Inner Membranes (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 65 (1996), S. 271-303 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.65.070196.001415
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  • 2
    Electronic Resource
    Electronic Resource
    Stable Desmearing of Slit-Collimated SAXS Patterns by Adequate Numerical Conditioning (1998)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 675-681 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Small-angle X-ray scattering (SAXS) patterns from slit cameras (`Kratky cameras') require a subsequent desmearing procedure in order to obtain the pinhole scattering curve that is suitable for subsequent structure analysis. Since the corresponding integral equation contains a singularity, its solutions are usually unstable and fail if large noise is present. It is demonstrated how analytical stability can be achieved by physically reliable conditioning of the experimental data, introduction of the Moore–Penrose pseudoinverse of the equation's discretized integral operator and solving the equation by a FFT algorithm. This ensures the consistency of the solution as well as its stability, and hence its convergence. This solution can account for arbitrarily nonsymmetrical primary-beam profiles. The algorithm does not require antecedent smoothing of the scattering curve. It allows on the contrary low-pass filter smoothing during desmearing but remains stable despite large noise contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876739800573X
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  • 3
    Electronic Resource
    Electronic Resource
    Protein translocation: Common themes from bacteria to man
    Amsterdam : Elsevier
    FEBS Letters 346 (1994), S. 73-77 
    Details
    ISSN: 0014-5793
    Keywords: Endoplasmic reticulum ; Membrane biosynthesis ; Protein transport ; Secretion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(94)00367-X
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  • 4
    Electronic Resource
    Electronic Resource
    DIDS (4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid) inhibits an early step of protein translocation across the mammalian ER membrane
    Amsterdam : Elsevier
    FEBS Letters 329 (1993), S. 268-272 
    Details
    ISSN: 0014-5793
    Keywords: Anion transporter ; Endoplasmic reticulum ; Photoaffinity labelling ; Protein translocation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(93)80235-M
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  • 5
    Electronic Resource
    Electronic Resource
    Über eine kristallisationskinetische Anomalie in Mischungen aus Polyethylen und Polyoxymethylen (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 381-386 
    Details
    ISSN: 1435-1536
    Keywords: Polyoxymethylen ; Polyethylen ; Mischungen ; Kristallisationskinetik ; Keimbildung ; Dispersionsgrad ; Fremdkeimdichte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract Thermoanalytical and polarization microscopic investigations on crystallization kinetics in mixtures of polyethylene and polyoxymethylene (POM) are reported. Mixing was performed by different methods. In the DSC-experiment, with extruded samples an additional crystallization peak occurs, which can be attributed to a delayed crystallizing fraction of POM. It is shown, that the observation is caused by an interface-induced, additional inhomogeneous nucleation and crystallization. The effect occurs, if with demixed systems the frequency of the particles of the disperse fraction, which is subject to preparation, is higher than the frequency of heterogeneous particles, which depends on the sample material.
    Notes: Zusammenfassung Es wird über thermoanalytische und polarisationsmikroskopische Untersuchungen zur Kristallisationskinetik unterschiedlich präparierter Mischungen aus Polyethylen und Polyoxymethylen (POM) berichtet. Im DSC-Experiment zeigt sich bei extrudiertem Material ein zusätzlicher Kristallisationspeak, der einer verzögert kristallisierenden POM-Fraktion zuzuordnen ist. Es wird gezeigt, daß die Beobachtung auf eine zusätzliche, durch die Phasengrenzfläche induzierte inhomogene Keimbildung und Kristallisation zurückzuführen ist. Dies ist genau dann möglich, wenn in entmischten Systemen die präparativ einstellbare Anzahl der Partikel der dispersen Fraktion die materialbedingte Anzahl der Fremdkeime übersteigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410256
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of polyethylene networks based on the jointed description of melting, swelling and deformation (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 110-110 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , 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/BF01410314
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of polyethylene networks based on the jointed description of melting, swelling and deformation (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 607-619 
    Details
    ISSN: 1435-1536
    Keywords: Network ; van der Waals model ; eutectoid copolymers ; equilibrium swelling ; modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Investigations of melting, equilibrium swelling and the stress-strain behavior of radiation crosslinked polyethylene are reported. The results are jointly described where by a novel phenomenological treatment of the swelling of van der Waals networks was needed implicating a discussion as to how the modulus is related to the concentration of the cross-linkages. This concentration is obtained from the analysis of the melting process by application of the thermodynamics of eutectoid copolymers, which is also shown to deliver structural parameters which are in good accord with X-ray data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419884
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  • 8
    Electronic Resource
    Electronic Resource
    Piezoelectric properties of electron-irradiated poly (vinylidene fluoride) (1990)
    Springer
    Applied physics 50 (1990), S. 523-529 
    Details
    ISSN: 1432-0630
    Keywords: 61.41.+ e ; 61.80.Fe ; 77.60+ v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Some of the piezoelectric constants of PVDF are strictly stress dependent. This behaviour is assumed to originate in a contribution of the interphase region between crystalline and amorphous phases to the piezoelectric effect in this material. This assumption is supported by the changes in piezoelectricity after irradiation with fast electrons. Such treatment causes crosslinking predominantly in the amorphous regions and, consequently, significant changes in the mobility of molecular electric moments. The piezoelectric constants become smaller upon irradiation, this being caused by a reduced permanent polarization, by increased mechanical stiffness, and by the reduced reorientability of the molecular electric moments in the interphase. One of the nonlinear piezoelectric coefficients changes its sign at a certain irradiation dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323443
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  • 9
    Electronic Resource
    Electronic Resource
    Some novel crystallization kinetic peculiarities in finely dispersing polymer blends (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 16-27 
    Details
    ISSN: 1435-1536
    Keywords: Fractionatedcrystallization ; polymerblends ; nucleation ; interface ; infacialenergies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The morphology and the crystallization of blends of poly(vinylidene fluoride) (PVDF) with polyamide-6 (PA-6), and with poly(butylene terephthalate) (PBTP), were investigated in detail by electron microscopy and by DSC. In some of the blends, the dispersed component exhibits rather small particle sizes and, followingly, a high number density of the dispersed particles which is in the order of magnitude of, or exceeds the number density of the usually nucleating heterogeneities. In these blends, the crystallization of the dispersed component proceeded in two steps, induced by different nucleating species (“fractionated crystallization”). The nuclei concentrations in the components and the specific interfacial energies of the PVDF nucleation steps were estimated. An unusual type of fractionated crystallization occurs in some cases: matrix and disperse phases crystallize completely coincident due to a specific mutual nucleating efficiency of both components. An estimation of the interfacial energies involved suggests a nucleating activity of PVDF crystals for PA-6. Moreover, a rise of the crystallization temperatures of the PA-6 and PBTP matrix phases is observed that may indicate a migration of nucleating impurities during melt processing from PVDF towards the second component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410144
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  • 10
    Electronic Resource
    Electronic Resource
    Competition between crystallization and phase separation in polymer blends I. Diffusion controlled supermolecular structures and phase morphologies in poly(ɛ-caprolactone)/polystyrene blends (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 772-780 
    Details
    ISSN: 1435-1536
    Keywords: Polymer blends ; phase separation ; crystalline morphology ; phase transition kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The type of supermolecular structure and the morphology in binary polymer blends with one crystallizable component and with a miscibility gap are strongly influenced by the relative rate of crystallization and demixing. Depending on the composition of the blend and on the relative position of the crystallization curve and the miscibility gap in the phase diagram, demixing-induced crystallization as well as crystallization-induced demixing can occur. Both these approaches lead to new and interesting structures. Additionally, the interaction of the two mentioned kinds of phase transition can under circumstances affect the growth rates of adjacent spherulites. This results in anisotropic concentration distribution or phase-separation morphology around their surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657443
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