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  • 1
    Digitale Medien
    Digitale Medien
    Energy-level spectra of Co2+ and Fe2+ in diluted magnetic semiconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4221-4232 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In this paper we study the low-lying energy levels of Co2+ and Fe2+ in diluted magnetic semiconductors, such as Cd1−xCoxTe and Cd1−xCoxSe, and their iron-based counterparts. In the first of these compounds, the magnetic ion sits on a site of symmetry Td, while in the second the symmetry is trigonal (C3v). We develop a formulation that permits a continuous variation from Td to C3v symmetry. Comparison with experimental data in Cd1−xCoxSe shows that the C3v distortion amounts to about 10% of the crystal potential at the Co2+ site. Our study of the energy spectra of Fe2+ in Td and C3v crystal potentials reveals that, even in the cubic field, the levels exhibit an anisotropy which manifests itself in an anisotropy of the magnetization M in the regime in which M is not a linear function of the magnetic field B. The study includes all the levels in the lowest terms of the (3d)7 and (3d)6 configurations of Co2+ and Fe2+, thus considerably extending work by previous authors. The calculations are carried out to second order in the spin-orbit interaction and in B for the lowest orbital states, and to first order in B for the excited states. The g factors of all the levels are obtained including their anisotropy for the Co2+ Γ8 states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344933
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  • 2
    Digitale Medien
    Digitale Medien
    Purification and Characterization of Guanine Nucleotide-Exchange Factor, eIF-2B, and p37 Calmodulin-Binding Protein from Calf Brain (1995)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 65 (1995), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Eukaryotic initiation factor 2B, or guanine nucleotide-exchange factor, has been purified for the first time from the brain by a novel procedure that allows the purification of initiation factor 2 as well and uses a salt wash postmicrosomal supernatant as starting material. The procedure includes a three-part chromatographic step in heparin-Sepharose and in SP-5PW and diethylaminoethyl-5PW ion-exchange high-performance chromatographies. The purification of the factors was followed by measuring activity in the guanine nucleotide-exchange assay and the capacity of initiation factor 2 to form a ternary complex with the initiation form of methionyl-tRNA and GTP. The method yields guanine nucleotide-exchange factor (75%) and highly purified initiation factor 2 (〉95%), which are separated in the last step. The exchange factor from the brain is a multimeric protein with five subunits of molecular masses of 82, 65, 52, 42, and 30 kDa; it stimulates ternary complex formation in the presence of GDP, and this activity is inhibited by N-ethylmaleimide. A 37-kDa protein that copurifies with initiation factors is characterized in this study as a new calmodulin-binding protein (p37); it is highly phosphorylated by casein kinase activities and can comigrate with the α subunit of initiation factor 2 under standard sodium dodecyl sulfate electrophoresis conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.1995.65020754.x
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  • 3
    Digitale Medien
    Digitale Medien
    Enzydmatic Characterization of Babesia bovis (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: . Agarose gel electrophoresis was used to identify metabolic enzymes in Babesia bovis and B. bigemina. Glutamate dehydrogenase, lactate dehydrogenase, glucose phosphate isomerase, and hexokinase were identified in B. bovis- and B. bigemina-infected erythrocytes and B. bovis merozoite preparations. A specific electrophoretic mobility was observed for each enzyme. Malate dehydrogenase, glucose 6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and adenylate kinase were only detected in normal erythrocyte preparations. Inter-species, but not intra-species, variation was noted when comparing electrophoretograms of both species. Kinin-activating activity was not detected in B. bovis-infected erythrocyte or merozoite preparations at pH 4.2 or 7.6.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05651.x
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  • 4
    Digitale Medien
    Digitale Medien
    Antiferromagnetic spin waves in superlattices of diluted magnetic semiconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 447-449 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present an analysis of the long-wavelength spin-wave excitations in superlattices of diluted magnetic semiconductors. The different magnetic modes are classified as "pure-bulk,'' "pure-interface,'' and "bulk-interface'' depending on whether they propagate along the axis of the superlattice in the two components of the structure, they decay in both regions, or they propagate in one and decay in the other. Numerical applications are considered related to inelastic light scattering from superlattices of Cd1−xMnxTe.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99894
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  • 5
    Digitale Medien
    Digitale Medien
    Electron mobility in extremely thin single-gate silicon-on-insulator inversion layers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6269-6275 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Inversion-layer mobility has been investigated in extremely thin silicon-on-insulator metal–oxide–semiconductor field-effect transistors with a silicon film thickness as low as 5 nm. The Poisson and Schrœdinger equations have been self-consistently solved to take into account inversion layer quantization. To evaluate the electron mobility, the Boltzmann transport equation has been solved by the Monte Carlo method, simultaneously taking into account phonon, surface-roughness, and Coulomb scattering. We show that the reduction of the silicon layer has several effects on the electron mobility: (i) a greater confinement of the electrons in the thin silicon film, which implies an increase in the phonon-scattering rate and therefore a mobility decrease; (ii) a reduction in the conduction effective mass and the intervalley-scattering rate due to the redistribution of carriers in the two subband ladders as a consequence of size quantization resulting in a mobility increase; and (iii) an increase in Coulomb scattering because of a greater number of interface traps in the buried Si–SiO2 and to a closer approach of these charged centers to the mobile carriers. The dependence of these effects on the silicon-layer thickness and on the inversion-charge concentration causes the mobility to be a nontrivial function of these variables. A detailed explanation of the mobility behavior is provided. Mobility for samples with silicon thickness below 10 nm is shown to increase in an electric field range that depends on the charged center concentration, while for silicon layers over 10 nm mobility always decreases as the silicon-layer thickness is reduced. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371684
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  • 6
    Digitale Medien
    Digitale Medien
    Monolithically integrated, flexible display of polymer-dispersed liquid crystal driven by rubber-stamped organic thin-film transistors (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3592-3594 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This letter describes the monolithic integration of rubber-stamped thin-film organic transistors with polymer-dispersed liquid crystals (PDLCs) to create a multipixel, flexible display with plastic substrates. We report the electro-optic switching behavior of the PDLCs as driven by the organic transistors, and we show that our displays operate robustly under flexing and have a contrast comparable to that of newsprint. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1377312
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  • 7
    Digitale Medien
    Digitale Medien
    pH, temperature, and concentration dependence of the chemical shift and scalar coupling constants in disodium hydrogen phosphite and disodium fluorophosphate (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 7201-7207 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100130a013
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  • 8
    Digitale Medien
    Digitale Medien
    Whole stimulated salivary flow in patients with chronic hepatitis C virus infection (2002)
    Oxford, UK : Blackwell Science, Ltd
    Journal of oral pathology & medicine 31 (2002), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background:  Salivary gland disorders have been included among the extra-hepatic manifestations related to HCV infection.Methods:  The whole stimulated salivary flow rate (spitting technique) was studied in 74 HCV infected patients to evaluate salivary gland dysfunction.Results:  The salivary flow of the patients with chronic HCV infection was similar to that of the healthy controls. The association between subjective xerostomia salivary flow was seen to be very weak. No significant associations were found between salivary flow and age, sex, risk factor of acquired infection, ALT, AST, GGT, ALP values, time lapsed since the diagnosis or HCV-RNA detection in saliva.Conclusions:  Although the functional repercussion of hepatitis C related lymphocytic sialoadenitis remains unclear, we did not find a significant reduction in the whole stimulated salivary flow in HCV infected patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.0904-2512.2001.00185.x
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  • 9
    Digitale Medien
    Digitale Medien
    Profile of Biogenic Amines in Goat Cheese Made from Pasteurized and Pressurized Milks (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: : The formation of biogenic amines in goat cheese can be prevented through ensuring hygiene in raw materials and during manufacture, thereby avoiding potential decarboxylating microorganisms. High-pressure treatment may be used to inactivate microorganisms and is a potential alternative to pasteurization. This treatment could provoke higher proteolysis than pasteurization, leading to a higher availability of biogenic amine precursors. We compared the biogenic amine profile throughout the ripening of goat cheese made from pressurized milk with that obtained from pasteurized milk. Results indicate that the profile of biogenic amines is very similar for both cheeses. Tyramine was the prevailing amine in both cheeses, followed by cadaverine, putrescine, and histamine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb08842.x
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  • 10
    Digitale Medien
    Digitale Medien
    Distribution of Biogenic Amines and Polyamines in Cheese (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Biogenic amines and polyamines were measured in unripened cheese and 4 types of ripened cheese. The study included cheeses produced from both pasteurized and raw milks. All amines were lower in unripened than in ripened cheeses. The amine contents varied among different types of ripened cheese, within the same type of cheese, and also within the parts of cheeses. The main amines in ripened cheeses were tyramine, cadaverine, and putrescine. The highest concentration of tyramine was found in hard-ripened raw-milk cheeses, while blue cheese had the highest level of cadaverine. Unripened cheeses could be considered as well-tolerated products for histamine- and tyramine-sensitive individuals, whereas the wide variability in biogenic amines makes it difficult to generalize this consideration for all ripened cheeses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb08236.x
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