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  • 1
    Electronic Resource
    Electronic Resource
    Structural and functional correlates of sucrase-.alpha.-dextrinase in intact brush border membranes (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 10399-10408 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00107a006
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary crystallographic studies of antibacterial polypeptide LCI expressed in Escherichia coli (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1931-1932 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: LCI is a type of novel antibacterial polypeptide secreted by a Bacillus subtilis strain. It consists of 47 residues with a molecular weight of 5468 Da. Using bioengineering, LCI was expressed in Escherichia coli DH5α with recombinant plasmid pBVAB16. It was crystallized using PEG 4000 as a precipitant. The crystal belongs to space group P6222 or P6422, with unit-cell parameters a = b = 29.30, c = 187.09 Å, and diffracts to 2.44 Å. A set of diffraction data to 2.8 Å was collected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444901017280
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary crystallographic studies of bar-headed goose fluoromethaemoglobin with inositol hexaphosphate (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1183-1184 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Bar-headed goose fluoromethaemoglobin (fluoromet-Hb) complexed with inositol hexaphosphate (IHP) has been crystallized using PEG 6000 as precipitant. The crystal belongs to space group P21, with unit-cell parameters a = 59.8, b = 72.0, c = 79.8 Å, β = 102.1°, and diffracts to 2.5 Å resolution. To prove the presence of IHP, the structure was determined by the molecular-replacement method. IHP was observed at the entrance to the central cavity between the N and C termini of two β subunits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900008660
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  • 4
    Electronic Resource
    Electronic Resource
    Purification of Urokinase by Affinity Cross-flow Filtration Using a Water-soluble Macroligand (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 799 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb33240.x
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Film Thickness on Intrinsic Growth Stress and Raman Evaluation of Tetrahedral Amorphous Carbon Films (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 3627-3630 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To investigate the effects of film thickness on Raman characterization and intrinsic stress of tetrahedral amorphous carbon and ascertain the correlations between stress and Raman spectra, the ta-C films with different film thickness were deposited on the polished P-type (100) c-silicon substrate with the same conditions by the filtered cathodic vacuum arc technology. The film thicknesswas measured by the surface profiler and the atomic force microscope; stress was calculated according to the curvature of the stress samples examined by the surface profiler; the microstructure of the films was characterized by the Ramanscope. It has been shown that the stress drops down continuously and the dropping rate turns mild with the increase of film thickness. When the filmthickness surpasses 30 nm, the compressive stress is kept at less than 5 GPa. The intensity of the first and second order peak of the c-Si substrate in the visible Raman spectra gradually depresses with the increase of thickness. However, the FWHM is minimal and the maximal intensity is highest from 50 nm to 80 nm, accordingly the clearest Raman signals can be acquired in this scale. Additionally, the position of the asymmetric broad peak gradually shifts towards the lower wavenumber with the increase of thickness and the decease of intrinsic stress
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.3627.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Field-dependent quantum nucleation of antiferromagnetic bubbles (2000)
    Springer
    The European physical journal 18 (2000), S. 703-712 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.45.+j Macroscopic quantum phenomena in magnetic systems - 73.40.Gk Tunneling - 75.30.Gw Magnetic anisotropy - 75.50.Ee Antiferromagnetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The phenomenon of quantum nucleation is studied in a nanometer-scale antiferromagnet with biaxial symmetry in the presence of a magnetic field at an arbitrary angle. Within the instanton approach, we calculate the dependence of the rate of quantum nucleation and the crossover temperature on the orientation and strength of the field for bulk solids and two-dimensional films of antiferromagnets, respectively. Our results show that the rate of quantum nucleation and the crossover temperature from thermal-to-quantum transitions depend on the orientation and strength of the field distinctly, which can be tested with the use of existing experimental techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070018
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  • 7
    Electronic Resource
    Electronic Resource
    Topological phase interference effects in resonant quantum tunneling of the Néel vector between nonequivalent magnetic wells in mesoscopic single-domain antiferromagnets (2000)
    Springer
    The European physical journal 14 (2000), S. 349-361 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 03.65.Bz Foundations, theory of measurement, miscellaneous theories (including Aharonov-Bohm effect, Bell inequalities, Berry's phase) - 75.45.+j Macroscopic quantum phenomena in magnetic systems - 75.50.Ee Antiferromagnetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Resonant quantum tunneling of the Néel vector between nonequivalent magnetic wells is investigated theoretically for a nanometer-scale single-domain antiferromagnet with biaxial crystal symmetry in the presence of an external magnetic field applied along the easy anisotropy axis, based on the two-sublattice model. Both the Wentzel-Kramers-Brillouin exponent and the preexponential factors are evaluated in the instanton contribution to the tunneling rate for finite and zero magnetic fields by applying the instanton technique in the spin-coherent-state path-integral representation, respectively. The quantum interference or spin-parity effects induced by the topological phase term in the Euclidean action are discussed in the rate of quantum tunneling of the Néel vector. In the absence of an external applied magnetic field, the effect of destructive phase interference or topological quenching on resonant quantum tunneling of the Néel vector is evident for the half-integer excess spin antiferromagnetic nanoparticle. In the weak field limit, the tunneling rates are found to oscillate with the external applied magnetic field for both integer and half-integer excess spins. We discuss the experimental condition on the applied magnetic field which may allow one to observe the topological quenching effect for nanometer-scale single-domain antiferromagnets with half-integer excess spins. Tunneling behavior in resonant quantum tunneling of the magnetization vector between nonequivalent magnetic wells is also studied for a nanometer-scale single-domain ferromagnet by applying the similar technique, but in the large noncompensation limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050139
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  • 8
    Electronic Resource
    Electronic Resource
    Resonant quantum coherence of magnetization at excited states in nanospin systems with different crystal symmetries (2000)
    Springer
    The European physical journal 16 (2000), S. 507-513 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.45.+j Macroscopic quantum phenomena in magnetic systems - 75.10.Jm Quantized spin models - 03.65.Bz Foundations, theory of measurement, miscellaneous theories (including Aharonov-Bohm effect, Bell inequalities, Berry's phase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The quantum interference effects induced by the Wess-Zumino term, or Berry phase are studied theoretically in resonant quantum coherence of the magnetization vector between degenerate states in nanometer-scale single-domain ferromagnets in the absence of an external magnetic field. We consider the magnetocrystalline anisotropy with trigonal, tetragonal and hexagonal crystal symmetry, respectively. By applying the periodic instanton method in the spin-coherent-state path integral, we evaluate the low-lying tunnel splittings between degenerate excited states of neighboring wells. And the low-lying energy level spectrum of mth excited state are obtained with the help of the Bloch theorem in one-dimensional periodic potential. The energy level spectrum and the thermodynamic properties of magnetic tunneling states are found to depend significantly on the total spins of ferromagnets at sufficiently low temperatures. Possible relevance to experiments is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070210
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly(DL-lactic acid/glycolic acid) (1993)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 14 (1993), S. 457-460 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1993.030140715
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  • 10
    Electronic Resource
    Electronic Resource
    In vitro degradation of polylactide and poly(lactide-co-glycolide) microspheres (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 2099-2106 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyactide (PLA) and poly(lactide-co-glycolide) (PLGA) were prepared by bulk ring-opening polymerization of lactide or lactide/glycolide using stannous octoate as initiator. PLA and PLGA microspheres with an average diameter of 65-100 μm were prepared by a solvent evaporation process. An in vitro degradation test of different molecular weight PLA and of different composition PLGA were carried out in pH 7.4 buffer solution at 37°C in the form of microspheres. Quantitatively, the degree of degradation was monitored by gel permeation chromatography (GPC), by measurement of mass loss and determination of lactic/glycolic acid in degradation medium, and qualitatively, by observing the morphological changes of microspheres with a scanning electron microscope (SEM). The decrease in weight average molecular weight (Mw) for PLA with higher molecular weight is faster at the first degradation stage; afterward, the tendency of Mw to decrease for PLA with different molecular weight is almost the same. PLGA degrades much faster than does PLA, and the degradation rate is significantly enhanced with the increase of glycolic acid (GA) content in copolymers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070431117
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