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  • 1
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary α1-acid glycoprotein, a major human serum glycoprotein was detected and localized in human liver parenchymal cells of a biopsy specimen. A heavy metal salt containing fixative was required to retain sufficient antigen determinants of α1-acid glycoprotein in order to visualize this protein by the peroxidase-anti-peroxidase unlabeled antibody enzyme method.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 275 (1975), S. 391-395 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Generator-Coordinate-Method is applied to describe yrast-bands and excited vibrational bands of pairing-vibrational orβ-vibrational type in deformed rare earth nuclei. The model wave functions are supplied by the Pairing+Quadrupole-Model with angular momentum — and particle number projection. Results are shown for the nucleus170Yb. The question if backbending may be produced by the intersection of the ground and the neutron pairing vibrational band is discussed.
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An angular momentum projected particle-hole theory is proposed as an approach to describe excited states of deformed nuclei. Both for the ground and the excited states, angular momentum projections are done before variation. This allows one to look for the effect, with an appropriate constraint, of the difference in the deformations of these states. The theory is applied to the case of Ne20 where the splitting of the giant resonance is observed. Other negative parity states are also studied and their transitions to the 2+ member of the ground state band show interesting features which may have experimental implications. On the other hand, the change in the deformation of the excited states has only a small effect on the transition probabilities.
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  • 4
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A variational principle is used to determine the optimal angular momentum projected one determinant approach to theN-nucleon yrast-wave function for a given total spin value. The solution is given in terms of a set of coupled nonlinear equations. Besides an orthonormality constraint for the occupied orbits and a normalization condition for the total wave function, this set consists out of a matrix equation taking care of the fact that the spin-projected wave function does not depend on the orientation of the intrinsic determinant it is based on, and a second subset of equations, which can be considered as a Thouless theorem for the spin-projectedN-nucleon state, and describes the diagonalization of the total Hamiltonian in the subspace of linear independentN-nucleon shell model configurations contained in the test-determinant. Furthermore, a numerical method for the solution of these equations is proposed and an extension of the theory for the description of excited bands is given. Finally, the consistency of the equations is checked by solving them for a simple example analytically.
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  • 5
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A low mol.wt, dialyzable glycosaminoglycan was isolated from human aorta and was found to be homogeneous on 2 dimensional electrophoresis. As judged by its electrophoretic mobilities and its hydrolysis by chondroitin sulfatase ABC, it was concluded that this hitherto unknown glycosaminoglycan is an oversulfated chondroitin sulfate.
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  • 6
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A heteroglycan was purified from human plasma and partially characterized in terms of its major properties. It is noteworthy that the carbohydrate content of this blood constituent is unusually high (75%).
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Organosilicon Compounds. 72. The Reactivity of Carbosilanes and their C-Chlorinated Derivatives in Reactions with CH3MgCl and LiCH3Reactions of (H3Si—CH2)2SiH2 1, (H2Si—CH2)3 2, (H3Si)2CCl2 3, (H3Si)2CHCl 4, H3Si—CCl2—SiH2-CH2-SiH3 5, and (H3Si—CCl2)2SiH2 6 as well as H3SiCH2Cl, H3SiCHCl2, and H3SiCCl3 with meMgCl and Lime (me = CH3) respectively are reported. In 1 and 2 by using tetrahydrofurane (THF) as a solvent, methylation to a higher degree is possible. The C-chlorination increases the activation of the Si—H group. Reactions of the C-chlorinated compounds result in Si—H substitution (maintaining of molecular frame), in cleavage and enlargement of the molecular frame and in transformation of CCl2 group into CHCl and CH2 groups respectively. Reactions with meMgCl in THF and with Lime in diethylether (Et2O) favour the cleavage of the molecular and the hydrogenation of the CCl2 group. The methylation of compound 5 occures on the Si—H groups neighbouring the CCl2 groups. The reactivity of these Si—H groups is decreased by increasing methylation. Reacting compound 6 with meMgCl in Et2O cleavage reations dominate. However, using cyclohexane as a solvent this cleavage reaction recedes in favour of the formation of 1,3,5-trisilapentane, containing a CCl2 group and a CHCl or a CH2 group. Thereby however, the methylation of only two SiH groups is observed. The 1H-, 29Si-, and 13C-n.m.r. data allow an assessment of progressing SiH-methylation within the homologous series.
    Notes: Es wird über Umsetzungen von (H3Si—CH2)2SiH2 1, (H2Si—CH2)3 2, (H3Si)2CCl2 3, (H3Si)2CHCl 4, H3Si—CCl2—SiH2—CH2-SiH3 5 und (H3Si—CCl2)2SiH2SiH2 6 sowie von H3Si—CH2Cl, H3Si—CHCl2, H3Si—CCl3 mit meMgCl bzw. Lime (me = CH3) berichtet. In 1 und 2 werden durch Verwendung von Tetrahydrofuran (THF) als Lösungsmittel höhere Methylierungsstufen ermöglicht. Die C-Chlorierung bewirkt eine Aktivierung der Si—H-Gruppe. Die C-chlorierten Verbindungen reagieren unter Si—H Substitution (Erhalt des Molekülgerüstes), unter Spaltungen und Vergrößerungen des Molekügerüstes und unter Hydrierung der CCl2-Gruppe zu der CHCl- bzw. CH2-Gruppe. Bei Umsetzungen mit meMgCl in THF oder mit Lime in Diäthyläther (Et2O) werden Reaktionen begünstigt, die unter Molekülspaltung und CCl2-Hydrierung ablaufen. In 5 beginnt die Methylierung an den der CCl2-Gruppe benachbarten SiH-Gruppen, deren Reaktionsfähigkeit mit steigendem Methylierungsgrad sinkt. Bei 6 bestimmen die Si—C-Spaltungen den Reaktionsablauf (Umsetzung mit meMgCl in Et2O), der aber durch Verwendung von Cyclohexan als Lösungsmittel zurückgedrängt wird zugunsten der Bildung von 1,3,5-Trisilapentanen mit einer CCl2- und einer CHCl- oder CH2-Gruppe, wobei aber nur maximal die Methylierung von zwei SiH-Gruppen erreicht wird. Die 1H-, 29Si- und 13C-NMR-Daten erlauben eine Abschätzung des Verlaufs der SiH-Methylierung innerhalb der homologen Reihen.
    Additional Material: 5 Ill.
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  • 8
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The zinc concentration in an epitaxial layer of InSb was measured by proton excited X-rays. For the determination of zinc concentration, the X-ray yield was compared to that from known zinc concentrations. As layer thickness, stopping power and X-ray absorption must be taken into account, a general mathematical evaluation was developed. In an appendix, the derived equations are shown to allow a layer thickness determination. The calculated values agree quite well with the experimental results.
    Additional Material: 5 Ill.
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  • 9
    Publication Date: 2014-02-27
    Description: Sex-biased genes are genes with a preferential or specific expression in one sex and tend to show an accelerated rate of evolution in animals. Various hypotheses—which are not mutually exclusive—have been put forth to explain observed patterns of rapid evolution. One possible explanation is positive selection, but this has been shown only in few animal species and mostly for male-specific genes. Here, we present a large-scale study that investigates evolutionary patterns of sex-biased genes in the predominantly self-fertilizing plant Arabidopsis thaliana . Unlike most animal species, A. thaliana does not possess sex chromosomes, its flowers develop both male and female sexual organs, and it is characterized by low outcrossing rates. Using cell-specific gene expression data, we identified genes whose expression is enriched in comparison with all other tissues in the male and female gametes (sperm, egg, and central cell), as well as in synergids, pollen, and pollen tubes, which also play an important role in reproduction. Genes specifically expressed in gametes and synergids show higher rates of protein evolution compared with the genome-wide average and no evidence for positive selection. In contrast, pollen- and pollen tube-specific genes not only have lower rates of protein evolution but also exhibit a higher proportion of adaptive amino acid substitutions. We show that this is the result of increased levels of purifying and positive selection among genes with pollen- and pollen tube-specific expression. The increased proportion of adaptive substitutions cannot be explained by the fact that pollen- and pollen tube-expressed genes are enriched in segmental duplications, are on average older, or have a larger effective population size. Our observations are consistent with prezygotic sexual selection as a result of interactions during pollination and pollen tube growth such as pollen tube competition.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
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  • 10
    Publication Date: 2014-03-19
    Description: We assessed evidence for a contextual effect of positive intergroup contact, whereby the effect of intergroup contact between social contexts (the between-level effect) on outgroup prejudice is greater than the effect of individual-level contact within contexts (the within-level effect). Across seven large-scale surveys (five cross-sectional and two longitudinal), using multilevel...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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