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  • Articles  (31)
  • 2010-2014  (2)
  • 1985-1989  (19)
  • 1980-1984  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Molecular biology reports 7 (1981), S. 197-202 
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is thought that eucaryotic elongation factor eEF-Ts catalyzes the replacement of GDP for GTP on eucaryotic elongation factor eEF-Tu. We have found that eEF-Ts displays a strong nucleoside diphosphate phosphotransferase activity. This transferase activity resides in a dimer molecule of a subunit molecular weight close to 30,000. The transfosforylating activity of eEF-Ts results in a stimulatory effect of ATP, GTP, UTP and CTP on protein synthesis provided that GDP is present. The specificity for guanine nucleotides in protein synthesis resides only in eEF-Tu.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 2225-2226 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Characteristic spectra of light emission from CH molecules and hydrogen atoms sputtered from hydrogen-implanted graphite are observed. The relative intensities from both species vary with the implanted fluence. The CH yield remains constant while the Hα yield increases. This is consistent with two binding states of implanted hydrogen in graphite.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 504 (1983), S. 155-162 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation of CuGaSe2 and CuGaTe2 under High PressureThe X-ray powder diffraction analysis at 300 K in dependence on the pressure gives a transition from the chalcopyrite-type to the NaCl structure for CuGaSe2 at 12.5 GPa and for CuGaTe2 at 8 GPa. The phase transition is associated with a discontinuity of the volume of 8.6 and 3.8%. These results were discussed in relation to other tetrahedrally coordinated compounds.
    Notes: Röntgenuntersuchungen bei 300 K in Abhängigkeit vom Druck ergaben, daß CuGaSe2 bei 12,5 GPa und CuGaTe2 bei 8 GPa von der Chalcopyrit-Struktur in die NaCl-Struktur übergehen. Dabei tritt ein Volumensprung von 8,6 bzw. 3,8% auf. Diese Ergebnisse werden im Zusammenhang mit Hochdruckuntersuchungen an anderen tetraedrisch koordinierten Verbindungen diskutiert.
    Additional Material: 5 Ill.
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  • 4
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mossbauer spectra of a vacuum deposited 95 nm thick57Fe film sandwiched between 35 nm copper layers on a beryllium substrate were measured during and after implantation with 60 keV D3 + ions to a fluence of 1.2×1018 D+/cm2. The modifications of the spectra indicate that at the target temperature of 100 K deuterium is mainly trapped at defects in the α-iron lattice or reemitted. Hydride formation is observed only weakly when the fluence exceeds 1018 D+/cm2. After annealing at room temperature, a complete recovery of the ordinary α-iron spectrum is observed.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 38 (1987), S. 741-759 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Collinear Laser Ion Beam Spectroscopy (CLIBS) investigates hyperfine structures (hfs) and isotope shifts (IS) in spectral lines and is well suited for the study of nuclear moments of short-lived isotopes. It is fast, highly selective, highly sensitive and allows many experimental alternatives. The high accuracy makes it also an interesting tool for atomic physics. A basic experimental setup is described. Results for nuclear moments and radii in Sm, Eu, Gd show that the accuracy of hfs and IS data is much better than the resulting moments. We discuss the hfs-anomaly and its dependence on atomic quantum numbers (L, S, J) and show that its determination is possible without the knowledge of the nuclear magnetic moments. A hfs-anomaly in respect of the nuclear quadrupole moment was not found. IS-measurements are used to determine permanent and fluctuating nuclear deformation. The standard interpretation is inconsistent in the case of Eu. Modifications of the theory are suggested. Crossed second order (CSO) effects affect the IS values. We show that CSO-effects may help to determine the field effect of the IS experimentally.
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  • 6
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe des Mikro-Thermoanalysators und des Wärmeflußcalorimeters DSC 111 der Fa. Setaram wurden die Entropien für den Phasenübergang Chalcopyrit-Zinkblende von AIBIIIC 2 VI - und AIIBIVC 2 V -Verbindungen bestimmt. Aus diesen Experimenten kann nicht geschlossen werden, welche Ordnung der Übergang besitzt. In der Diskussion wird jedoch gezeigt, daß ein Übergang erster Ordnung wahrscheinlich ist. Eine einfache Korrelation zwischen dem Gitterkonstantenverhältnis, extrapoliert bis zum Schmelzpunkt und der auf den Schmelzpunkt reduzierten Umwandlungstemperatur gestattet die Vorhersage von Phasenumwandlungen.
    Abstract: Резюме С помощью микротермо анализатора Сетарам и ДСК 111с тепловым потоком было определено изме нение энтропии при фа зовом переходе типа халько пирит-сфалерит для соединений АIBIIIC 2 VI и АIBIVC 2 V . На основе полученных результа тов не представилось возможным установит ь порядок перехода, но в обсуждении указывае тся как на переход первого порядка. На ос нове простой корреля ции между отношением постоянн ых решетки, экстраполированных до температуры плавл ения, и приведенной темпера турой фазового перехода, можно устан овить степень разупо рядочения.
    Notes: Abstract The entropy change of the phase transition from the chalcopyrite to the sphalerite structure of compounds AIBIIIC 2 VI and AIIBIVC 2 V was determined with a Setaram Microthermalanalyzer and a DSC 111 heat flow calorimeter. From these results one can not generally decide the order of the phenomenon, but the discussion gives hints as to a first-order transition. On the basis of a simple correlation between the ratio of the lattice constants extrapolated up to the melting temperature and the reduced temperature of the phase transition, it is possible to predict the order disorder behaviour.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 213 (1980), S. 393-410 
    ISSN: 1432-0878
    Keywords: Choroid plexus ; 5S-antibody (immunoglobulin) ; Immunoelectron microscopy ; Chick ; Tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The choroid plexus from the lateral ventricles of 18-day chick embryos was cultivated as an organ in medium 199 until the degeneration of the stroma. Selected plexuses forming an empty epithelial sac were then incubated with enzyme-treated human immunoglobulin (5S-antibody) and with native human immunoglobulin (7S-antibody). Uptake of the 7S-antibody was observed after 30 min, whereas the 5S-antibody was taken up by the choroid plexus within 1 min, as demonstrated by means of the peroxidase-anti-peroxidase (PAP) technique (Sternberger 1974). The antibodies were located in conspicuous, large vacuoles of the choroid epithelium. Further experiments were performed using only 5S-antibody. In addition to the demonstration of the protein structure of this immunoglobulin, it was also shown that its binding capacity for tetanus toxoid as an antigen remains intact in the intracellular location. It was not possible to observe lysosomal degradation. Moreover, 5S-antibody was detectable in cultures first incubated with 5S-antibody for 30 min and subsequently in antibody-free medium for a further period of 7 to 11 days. The biological significance of the uptake of material from the cerebrospinal fluid and the possibility of the existence of a receptor for 5S-antibody are discussed.
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  • 8
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0630
    Keywords: 61.70.Tm ; 61.70.Wp ; 61.80.Jh.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Deuterons of 10 keV energy and protons with the same mean projected range have been implanted into several metals at a temperature of approximately 35 K and at dose rates of approximately 2 × 1014 cm−2 s−1. The amount of retained deuterium saturates at fluences larger than roughly 2 × 1018 cm−2. After implantation of deuterons and subsequent bombardment with protons, the deuteron depth profiles show characteristic double peak structures, which indicate a replacement process. The experimental data are in good agreement with a simple model of local saturation and mixing. The possible implications of this model are discussed.
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3833-3837 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft carbonized layers prepared in a glow discharge, with a hydrogen concentration of H:C∼4/3, are exposed to helium ion bombardment at energies between 0.3 and 2.6 MeV. A strong ion-induced depletion of up to 3×103 H atoms per incident 4He+ ion is observed by means of high-energy ion beam analysis. The hydrogen release is shown to be a local process, with the electronic energy deposition as the main responsible mechanism. The results are successfully compared to a model which takes into account local bond breaking and retrapping and the local formation of hydrogen molecules.
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