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  • 1
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    Unbekannt
    Liberty or Equality? (1964)
    Chicago, Ill. : Periodicals Archive Online (PAO)
    Modern Age. 8:2 (1964:Spring) 134 
    Details
    ISSN: 0026-7457
    Thema: Politikwissenschaft
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5195-1964-008-02-000003
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  • 2
    Digitale Medien
    Digitale Medien
    Enzyme des Kohlenhydratstoffwechsels in ChlorellaHerrn Geheimrat Professor Dr. Heinrich Wieland zum 75. Geburtstag in ergebener Dankbarkeit gewidmet. (1952)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 85 (1952), S. 655-663 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In Extrakten aus Acetontrockenpulver von Chlorella pyrenoidosa werden Fermente nachgewiesen, die den Kohlenhydratabbau von Hexosemonophosphat über Hexosediphosphat und Triosephosphat zu Phosphoglycerinsäure katalysieren. Die Bedeutung dieser Befunde für den Mechanismus des photosynthetischen Kohlenhydrataufbaues wird diskutiert.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19520850702
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  • 3
    Digitale Medien
    Digitale Medien
    Mechanically driven alloying and grain size changes in nanocrystalline Fe-Cu powders (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2794-2802 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Highly supersaturated nanocrystalline FexCu100−x alloys (10≤x≤95) have been prepared by mechanical alloying of elemental crystalline powders. The development of the microstructure is investigated by x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The results are compared with data for ball-milled elemental Fe and Cu powders, samples prepared by inert gas condensation, and sputtered films. The deformation during milling reduces the grain size of the alloys to 6–20 nm. The final grain size of the powders depends on the composition of the material. Single-phase fcc alloys with x≤60 and single-phase bcc alloys with x≥80 are formed even though the Fe-Cu system exhibits vanishingly small solid solubilities under equilibrium conditions. For 60≤x≤80, fcc and bcc solid solutions coexist. The alloy formation is discussed with respect to the thermodynamic conditions of the material. The role of the large volume fraction of grain boundaries between the nanometer-sized crystals, as well as the influence of internal strains and stored enthalpies introduced by ball milling, is critically assessed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353055
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal stability and grain growth behavior of mechanically alloyed nanocrystalline Fe-Cu alloys (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 131-141 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry were used to study the thermal stability of highly supersaturated nanocrystalline FexCu100−x alloys (10≤x≤95) synthesized by mechanical alloying. Alloys with x〈60 exhibit single-phase fcc structure while single-phase bcc alloys form for x(approximately-greater-than)80. For 60≤x≤80 fcc and bcc phases coexist. Heating to elevated temperatures leads to structural relaxation, phase separation, and grain growth of the metastable nanocrystalline solid solutions. Single-phase fcc and bcc alloys undergo significant strain release but no appreciable grain growth prior to phase separation. After phase separation pronounced grain growth sets in. In contrast, samples in the two-phase region show some grain growth and significant chemical redistribution even at low temperatures. The phase separation of single-phase fcc and bcc alloys proceeds via different mechanisms: fcc solid solutions decompose by forming small Fe precipitates, while demixing in bcc alloys starts by segregation of Cu atoms to bcc grain boundaries before nucleation of Cu precipitates. These results show that the stability and grain growth behavior of nanocrystalline alloys is strongly affected by the microstructure of the material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353890
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetic properties of the icosahedral phase of Ti transition metal alloys : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5136-5137 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the magnetic properties of the icosahedral phase (i phase) in rapidly quenched Ti-Mn based alloys. Ribbons of i-phase samples of composition Ti61Mn37Si2, Ti61Mn22Cr15Si2, Ti61Mn22Fe15Si2, and Ti61Mn22Co15Si2 were prepared by melt spinning onto a copper disk in an argon atmosphere. Low-field magnetization data reveal a ferromagnetic ordering at Tc (approximately-equal-to) 40 K for Ti61Mn37Si2 samples. A partial substitution of Mn by Cr enhances Tc to 58 K with large thermal hysteresis, whereas samples of composition Ti61Mn22Fe15Si2 show no long-range magnetic ordering down to 4 K. We have found that the sample Ti61Mn22Co15Si2 shows evidence of spin-glass behavior below 15 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348101
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  • 6
    Digitale Medien
    Digitale Medien
    A sensitive resistivity probe of high temperature phase transformations (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 410-414 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A new apparatus for making in situ measurements of changes in the electrical resistivity accompanying phase transformations in metallic alloys is presented. Measurements can be made in vacuum or inert gas at annealing temperatures as high as 1500 K. The long-term thermal stability is better than ±0.3 K. The measurement circuit is stable to better than 0.01% over any time scale. This apparatus provides a relatively simple and inexpensive means for obtaining high temperature resistivity measurements on very brittle samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142135
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  • 7
    Digitale Medien
    Digitale Medien
    Effect of the Amount of Additives and Post-Heat Treatment on the Microstructure and Mechanical Properties of Yttrium–α-Sialon Ceramics (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The yttrium–sialon ceramics with the composition of Y0.333Si10Al2ON15 and an excess addition of Y2O3 (2 or 5 wt%) were fabricated by hot isostatic press (HIP) sintering at 1800°C for 1 h. The resulting materials were subsequently heat-treated in the temperature range 1300–1900°C to investigate its effect on the α→β-sialon phase transformation, the morphology of α-sialon grains, and mechanical properties. The results show that α-sialons stabilized by yttrium have high thermal stability. An adjustment of the α-sialon phase composition is the dominating reaction in the investigated Y–α-sialon ceramics during low-temperature annealing. Incorporation of excess Y2O3 could effectively promote the formation of elongated α-sialon grains during post-heat-treating at relatively higher temperature (1700° and 1900°C) and hence resulted in a high fracture toughness (KIC= 6.3 MPa·m1/2) via grain debonding and pullout effects. Although the addition of 5 wt% Y2O3 could promote the growth of elongated α grains with a higher aspect ratio, the higher liquid-phase content increased the interfacial bonding strength and therefore hindered interface debonding and crack deflection. The heat treatment at 1500°C significantly changed the morphology of α-sialon grains from elongated to equiaxed and hence decreased its toughness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03621.x
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  • 8
    Digitale Medien
    Digitale Medien
    Fate of carbon-14[-labeled] trifluralin in artificial rumen fluid and in ruminant animals (1969)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 17 (1969), S. 576-580 
    Details
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jf60163a030
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  • 9
    Digitale Medien
    Digitale Medien
    Photometric Titration of Thorium and Rare Earths with (Ethylenedinitrilo)tetraacetic Acid (1959)
    s.l. : American Chemical Society
    Analytical chemistry 31 (1959), S. 1353-1357 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac60152a032
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  • 10
    Digitale Medien
    Digitale Medien
    Pseudophosphorylation of tau protein alters its ability for self-aggregation (2004)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 88 (2004), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Filamentous tau protein deposits are a pathological hallmark of a group of neurodegenerative disorders (tauopathies). Tau protein in these aggregates is highly phosphorylated at different phosphorylation sites. Although tau filaments can be formed by heparin-induced aggregation of unphosphorylated recombinant tau, it is not known how tau phosphorylation modulates aggregation behaviour. Analysis of the effect of tau phosphorylation at defined single or multiple sites is hampered by the low specificity of protein kinases and the highly dynamic turnover of phosphorylation in vivo. To overcome this problem we employed site-directed mutagenesis to convert serine and threonine to aspartic acid or glutamic acid, which introduce a negative charge and conformational change that mimic phosphorylation. We tested 14 different mutated tau proteins for their propensity for self-aggregation and formation of tau filaments. Tau aggregation was monitored with thioflavin S fluorescence in the presence of different inducers such as heparin, Al3+, Fe2+ and Fe3+. We found that mutations in the N-terminal portion up to amino acid 208 mainly suppress tau aggregation, whereas mutations in the C-terminal region mainly lead to an enhanced aggregation. Mutations in the middle portion of tau showed a mixed picture of suppression and enhancement of aggregation. A single amino acid change Ser422Glu has aggregation-favouring properties with all four inducers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.2003.02287.x
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