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  • 1
    Electronic Resource
    Electronic Resource
    Probing the Role of Histidine-372 in Zinc Binding and the Catalytic Mechanism of Escherichia coli Alkaline Phosphatase by Site-Specific Mutagenesis (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 2279-2284 
    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/bi00174a039
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and Optical Properties of Si Films Deposited by Inductively Coupled Plasma CVD at Room Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2228-2231 
    Details
    ISSN: 1013-9826
    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: Si films were deposited by inductively coupled plasma chemical vapor deposition at roomtemperature with a mixture of SiH4/H2. The microstructure of the film was characterized with Fouriertransform of infrared, Raman spectroscopy, atomic force microscopy. We found that SiH4 concentrationstrongly affects the structure of Si films and nano-crystalline film can be synthesized at room temperatureby optimizing the silane concentration. The analysis for optical properties of the films suggested that theoptical band gap EOPT of films are distinctively lower than those of amorphous Si films. It has beenobserved that the EOPT of sample decreases with the increasing of H content in film
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2228.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of Boron Carbide Nanobelts (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2166-2168 
    Details
    ISSN: 1013-9826
    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: Boron carbide nanobelts have been synthesized successfully by carbothermal growth method.Boron oxide, activated carbon, gallium oxide and sodium chloride in the molar ratios of 1: 5: 0.03: 0.2were used as raw materials. The width and thickness of the nanobelts range from 1 to 10 μm, and 80 to150 nm respectively. The length is up to 50–200 μm. Diffraction peaks in the XRD pattern can be indexedto rhombohedral boron carbide with lattice parameters of a=5.616Å, c=12.067 Å. SAED pattern recordedalong [ 010 ] zone axis shows (104 ) growth direction. A vapor–liquid–solid (VLS) growth process on theactive catalyst surface is supposed to interpret the growth mechanism of as–synthesized nanobelts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2166.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Pulsed Electric Current Sintering of Nano-Crystalline Iron-Base Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 589-592 
    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: A new process of pulsed electric current sintering was developed. It combinescompaction with activated sintering effectively and can manufacture bulky nano-crystallinematerials very quickly. Pulsed electric current sintering of high-energy ball-milled nano-crystallineiron-based powders is investigated in this work. A nanostructured steel is obtained with highrelative density and hardness by this process. The average grain size of iron matrix is 58nm and thecarbide particulate size is less than 100nm. The densification temperature of ball-milled powders isapproximately 200ºC lower than that of blended powders. When the sintering temperature increases,the density of as-sintered specimen increases but the hardness of as-sintered specimen firstincreases and then decreases. Microstructure analysis results show that the decrease of hardness iscaused by the dramatic grain growth of iron matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.589.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Numerical Study on Mold Filling Process of Casting (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 87-92 
    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: Techniques of numerical simulation on mold filling process of casting are investigated inthis paper. The mathematical model is formed on the ground of some selected theories incomputational fluid dynamics (CFD), Numerical Heat Transfer (NHT) and computational methodsto interfacial tracking. The discrete solution to the governing equations appeals to Finite VolumeMethod (FVM) on structured mesh. As for viscous turbulence flow and multiphase fluid flow inmold filling, engineering turbulence model and Volume of Fluid (VOF) method are adopted in thealgorithms, respectively. As a debut, the general-purpose CFD software is used to establish thepracticable mechanical model for the simulation. By means of numerical simulation, variation anddistribution of velocity, temperature, stress and configuration of casting, etc. with respect to timeand space in the filling process can be quantitatively analysed in detail, which is helpful forengineers to optimize their design of technics with less time and less cost and is meaningful toprovide the subsequent simulation, solidification process of casting, with initial conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.87.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Analysis on Temperature Field of Axial Alternating Magnetic Field-Assisted Electric Field-Activated Sintering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 702-708 
    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: The numerical simulation and experimental measurement of temperature distributionin electrical field activated sintering of titanium powders were carried out. The simulated andexperimental results were in good agreement. It was shown that the sintering temperaturegradually decreased from the center of sample to the outer. To improve the performance ofsintered material, the sintering temperature gradient had to minimize. A method, electricfield-activated sintering coupled with axial alternating magnetic field, was proposed tohomogenize sintering temperature field. The simulation of sintering temperature field was alsoconducted under different magnetic field intensity. It was proved that the maximum radialsintering temperature difference in sample was reduced by about three fourths, owing to the skineffect of induced current caused by alternating magnetic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.702.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Innate immune responses of a lepidopteran insect, Manduca sexta (2004)
    Oxford, UK; Malden , USA : Munksgaard International Publishers
    Immunological reviews 198 (2004), S. 0 
    Details
    ISSN: 1600-065X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary:  Many innate immune mechanisms are conserved throughout the animal kingdom. Manduca sexta, a widely used model for insect biochemical research, employs these mechanisms to defend against invading pathogens and parasites. We have isolated from M. sexta hemolymph a group of proteins (hemolin, peptidoglycan recognition proteins, β-1,3-glucan recognition proteins, and C-type lectins), which serve as a surveillance mechanism by binding to microbial surface molecules (e.g. peptidoglycan, lipopolysaccharide, lipoteichoic acid, and β-1,3-glucan). The binding triggers diverse responses such as phagocytosis, nodule formation, encapsulation, melanization, and synthesis of anti-microbial peptides/proteins. Some of these responses are mediated and coordinated by serine proteinase cascades, analogous to the complement system in mammals. Our current research is focused on the proteolytic activation of prophenoloxidase (proPO) – a reaction implicated in melanotic encapsulation, wound healing, and protein cross-linking. We have isolated three proPO-activating proteinases, each of which requires serine proteinase homologs as a cofactor for generating active phenoloxidase. The proteinases and proteinase-like molecules, containing one to two clip domains at their amino-terminus, are acute-phase proteins induced upon an immune challenge. Inhibitory regulation of the proteinases by serpins and association of the proteinase homologs with a bacteria-binding lectin are important for ensuring a localized defense response. Additional serine proteinases expressed in M. sexta hemocytes and fat body have been discovered. Future research efforts will be aimed at elucidating the proteinase cascade for proPO activation and investigating the roles of proteinases in other immune responses such as processing of plasmatocyte-spreading peptide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0105-2896.2004.0121.x
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  • 8
    Electronic Resource
    Electronic Resource
    Transitions between Γ and X states of short-period superlattices driven by antisymmetric interface phonons (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1977-1981 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Relative transition probability amplitudes for antisymmetric-interface-phonon-assisted Γ-X transitions in selected short-period superlattices are estimated by using the dielectric continuum model for antisymmetric interface optical phonons in conjunction with a Kronig–Penney model of the superlattice electronic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356321
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  • 9
    Electronic Resource
    Electronic Resource
    Cardiovascular Actions of Berberine (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Cardiovascular drug reviews 19 (2001), S. 0 
    Details
    ISSN: 1527-3466
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Berberine, is an alkaloid from Hydrastis canadensis L., Chinese herb Huanglian, and many other plants. It is widely used in traditional Chinese medicine as an antimicrobial in the treatment of dysentery and infectious diarrhea. This manuscript describes cardiovascular effects of berberine and its derivatives, tetrahydroberberine and 8-oxoberberine. Berberine has positive inotropic, negative chronotropic, antiarrhythmic, and vasodilator properties. Both derivatives of berberine have antiarrhythmic activity. Some of cardiovascular effects of berberine and its derivatives are attributed to the blockade of K+ channels (delayed rectifier and KATP) and stimulation of Na+-Ca2+ exchanger. Berberine has been shown to prolong the duration of ventricular action potential. Its vasodilator activity has been attributed to multiple cellular mechanisms. The cardiovascular effects of berberine suggest its possible clinical usefulness in the treatment of arrhythmias and/or heart failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1527-3466.2001.tb00068.x
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructures and Microwave Dielectric Characteristics of CaRAlO4 (R = Nd, Sm, Y) Ceramics with Tetragonal K2NiF4 Structure (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: CaRAlO4 (R = Nd, Sm, Y) ceramics with a K2NiF4 structure were prepared by a solid-state reaction approach, and their microwave dielectric characteristics were evaluated, along with their microstructures. Dense CaNdAlO4, CaSmAlO4, and CaYAlO4 ceramics were obtained by sintering at 1425°–1500°C in air for 3 h, and good microwave dielectric characteristics were achieved: (1) ɛ= 18.2, Qf= 17 980 GHz, τf=−52 ppm/°C for CaNdAlO4; (2) ɛ= 18.2, Qf= 51 060 GHz, τf=−3 ppm/°C for CaSmAlO4; and (3) ɛ= 18.9, Qf= 39 960 GHz, τf= 6 ppm/°C for CaYAlO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2004.tb06373.x
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