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  • 1
    Electronic Resource
    Electronic Resource
    A redetermination of bis(2-aminomethylpyridine)diperchloratocopper(II) (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 0-0 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199099485
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of the primary metal ion-activation sites of the diphtheria tox represser by X-ray crystallography and site-directed mutational analysis (1996)
    [s.l.] : Nature Publishing Group
    Nature structural biology 3 (1996), S. 382-387 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The diphtheria tox represser, DtxR, is a 226 amino acid transition metal ion-activated regulatory protein that controls the expression of diphtheria toxin in toxigenic Corynebacterium diphtheriae. The previously solved three-dimensional DtxR structures have identified two potential metal ion ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nsb0496-382
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  • 3
    Electronic Resource
    Electronic Resource
    Surface reconstruction in TGS family crystals under humidity and temperature controls (1999)
    Springer
    Materials research innovations 2 (1999), S. 289-298 
    Details
    ISSN: 1433-075X
    Keywords: Key words Ferroelectrics ; TGS family crystals ; Domain dynamics ; Hole formation ; Surface charge neutralisation ; Atomic force microscope
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Surface reconstruction of TGS family single crystals has been investigated using AFM at ambient and controlled conditions. Domain boundary migration with simultaneous formation of holes at the boundary has been imaged for the first time. It is found that domain wall migration is accompanied by formation of elongated holes on originally negative end. Using humidity / temperature controlled AFM, holes on the positive end have been obtained with fast dehumidification while there is no such hole-formation with slow dehumidification. These observations provide direct evidences for a dissolution / recrystallization model accounting for hole / terrace formations. On the basis of this work, it is further proposed that the hole-formation upon the fast dehumidification can be ascribed by mass transfer limitation (kinetic control). On the contrary, with a slow dehumidification rate, the same crystal plane would resume a flatten termination to reduce the total surface energy (thermodynamic control).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190050100
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Behavior of Urea-(D) Tartaric Acid and Urea-(DL) Tartaric Acid Crystals (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 609-613 
    Details
    ISSN: 1572-8943
    Keywords: organic inclusion compounds ; thermal properties ; urea-(D) tartaric acid and urea-(DL) tartaric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal behavior of two new non-linear optical (NLO) materials, urea-(D) tartaric acid (UDT) and urea-(DL) tartaric acid (UDLT) were studied by using DSC, TG and TMA. The results show that: 1) The two crystals have different melting points but similar decomposition temperatures due to the influences of intermolecular forces, which is attributed to the stereo effects of (D)-tartaric and (DL)-tartaric acid molecules; 2) There was only thermal expansion and no thermal contraction when the UDT and UDLT crystals were heated; 3) There was no phase transition within the measured temperature range; 4) The thermal expansion of the UDT and UDLT crystals shows a small anisotropy; 5) The specific heats of UDT and UDLT change linearly with temperature in the measured temperature range and the value for UDT is 1.321 J g-1 K-1 at 320 K while the specific heat of UDLT is 1.357 J g-1 K-1 at the same temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010184009607
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  • 5
    Electronic Resource
    Electronic Resource
    Microcalorimetric Investigations of K+- and Mg2+-Induced Polymerization of Actin at Temperatures from 293.15 K to 310.15 K (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 775-783 
    Details
    ISSN: 1572-8943
    Keywords: microcalorimetry ; muscle actin ; polymerization ; 't Hoff relation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Microcalorimetric measurements of the polymerization of actin in the presence of 100 mM KCl and 2 mM MgCl2were carried out with a Calvet MS-80 microcalorimeter at temperatures from 293.15 to 310.15 K. It was observed that the polymerization of actin was endothermic and the enthalpy change for actin polymerization was temperature-dependent. The enthalpy change ΔHowas fitted to ΔHo(kJ mol-1)=434.0-1.16 (T/K) and the change in heat capacity ΔCp ocalculated from ΔHowas -1.16 kJ (mol K)-1in the above range of temperatures. The direct calorimetry results showed that the enthalpy and entropy change for actin polymerization could not be obtained from measurements of the critical concentration and the only way to assess the enthalpy change for the polymerization of actin and similar reactions lies in the use of calorimetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010187719349
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  • 6
    Electronic Resource
    Electronic Resource
    Tensile Failure Mechanisms of Sisal Fibers in Composites (1998)
    Springer
    Journal of materials science 17 (1998), S. 1805-1807 
    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/10.1023/A:1006661704908
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  • 7
    Electronic Resource
    Electronic Resource
    Cracking of asphalt at low temperature as related to bitumen rheology (1998)
    Springer
    Journal of materials science 33 (1998), S. 2165-2170 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A laboratory investigation of the influence of bitumen rheology on low temperature behaviour of asphalt mixtures is described. Five bitumens from four sources and three different mixture types were studied. Rheological characteristics of the binders were measured using conventional methods (penetration, softening point and viscosity) as well as dynamic mechanical analysis (DMA). Low temperature properties of asphalt characterized by the fracture temperature were measured using thermal stress restrained specimen test (TSRST). Statistically significant relations between rheological characteristics of bitumens and TSRST fracture temperatures of asphalt specimens were established. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004383506240
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  • 8
    Electronic Resource
    Electronic Resource
    A system for measuring biaxial creep strains over short gage lengths (1996)
    Springer
    Experimental mechanics 36 (1996), S. 84-91 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a new system for measuring biaxial strains over gage lengths of 150 micrometers at temperatures up to 300°C under constant loading for times as long as 1300 hours. This system has been used to measure axial and lateral strains at notch roots with a radius of 1 millimeter in zirconium specimens. A complete description of the techniques and procedures as well as an overview of the results is given in this paper. The principle of the measurement is the interference of laser light reflected from three tiny indentations placed in an orthogonal pattern at the notch root. The indentations, which are applied with a Vickers microhardness tester, produce four fringe patterns; two are used for strain measurement in the axial direction and two for the lateral direction. The motions of these four fringe patterns are monitored with linear diode arrays and converted via a microcomputer system into the two measured strains. The system operates on a real-time basis so it is possible to record the strains as the notched specimen is loaded and then held at constant load.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328702
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