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  • 2005-2009  (127)
  • 2000-2004  (77)
  • 1995-1999  (76)
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  • 1
    Call number: ZSP-166(252)
    In: Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen
    Type of Medium: Series available for loan
    Pages: 151 S.
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 252
    Classification:
    Oceanology
    Location: Lower compact magazine
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemical reviews 95 (1995), S. 2529-2586 
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-072X
    Keywords: Key words Osmosis ; Yeast ; Mutant ; Glycerol ; Solute ; Complementation group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The screening of 20,000 Saccharomyces cerevisiae random mutants to identify genes involved in the osmotic stress response yielded 14 mutants whose growth was poor in the presence of elevated concentrations of NaCl and glucose. Most of the mutant strains were more sensitive to NaCl than to glucose at the equivalent water activity (aw) and were classified as salt-sensitive rather than osmosensitive. These mutants fell into 11 genetic complementation groups and were designated osr1–osr11 (osmotic stress response). All mutations were recessive and showed a clear 2+ : 2– segregation of the salt-stress phenotype upon tetrad analysis when crossed to a wild-type strain. The complementation groups osr1, osr5 and osr11 were allelic to the genes PBS2, GPD1 and KAR3, respectively. Whereas intracellular and extracellular levels of glycerol increased in the wild-type strains when exposed to NaCl, all mutants demonstrated some increase in extracellular glycerol production upon salt stress, but a number of the mutants showed little or no increase in intracellular glycerol concentrations. The mutants had levels of glycerol-3-phosphate dehydrogenase, an enzyme induced by osmotic stress, either lower than or similar to those of the parent wild-type strain in the absence of osmotic stress. In the presence of NaCl, the increase in glycerol-3-phosphate dehydrogenase activity in the mutants did not match that of the parent wild-type strain. None of the mutants had defective ATPases or were sensitive to heat stress. It is evident from this study and from others that a wide spectrum of genes is involved in the osmotic stress response in S. cerevisiae.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0983
    Keywords: Key words NaCl-stress ; KAR3 ; mitosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several mutants of Saccharomyces cerevisiae showing poor growth in the presence of elevated concentrations of NaCl were isolated to identify genes involved in the osmo-stress response. One of these mutants (WAY.5-4A-11; osr11) which showed a clear 2:2 segregation of the salt-stress phenotype upon tetrad analysis when crossed to a wild-type strain has been characterised. The mutation responsible for poor growth under salt-stress was recessive. The corresponding gene was cloned by complementation of the mutant phenotype and a 3.5-kb fragment was isolated. The sequence of this fragment matched that of KAR3, a gene previously identified to be involved in karyogamy and mitosis. Allelism of OSR11 to KAR3 was confirmed by tetrad analysis, and disruption mutants showed the same NaCl-phenotype as the original osr11 mutation. The disruption mutant was more sensitive to high sucrose concentrations than the original mutant was to high glucose concentrations. In a different genetic background (W303-1A), the kar3 disruptants were less sensitive to osmo-stress than the WAY.5-4A strain. Heat-stress, nitrogen-starvation and cultivation on ethanol failed to affect the growth of osr11 and kar3 mutants, pointing to a possible specific involvement of KAR3 in the osmotic-stress response. Microscopic studies showed that cell division of the kar3 mutants was impaired and NaCl-stress conditions aggravated the phenotype.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 2456-2469 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociation of fast nitrogen molecules with kinetic energies ranging from 200 to 2000 eV/atom was studied for grazing collisions with various fcc surfaces. At these energies, the dissociation is caused by vibrational and rotational excitation, the latter being favored for scattering along the surface semichannels. N2 is chemically inert and interacts mainly elastically with the surfaces. A controversial question is the role of the dynamic screening of the molecular constituents by the bulk electron gas during the dissociation process. Another interesting issue is the dependence of the dissociation probability on the azimuthal scattering angle—the fragmentation is highest for the low indexed direction. We treat both problems, by comparing results obtained from the different surfaces Pd(110), Ag(110), and Pt(110). The experimental data are compared to molecular dynamics simulations based on realistic interaction potentials as obtained from density functional theory calculations. The potentials are improved by adding an explicit dependence of the intramolecular bond strength on the molecule surface distance z, which leads to excellent agreement of experiment and simulations. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 39 (1998), S. 5098-5111 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Though, in contrast to standard quantum field theory (QFT), the tensor-algebra over the test-function space of hyperfunction quantum field theory has no local structure, the localization properties of states on this algebra can be used to derive asymptotic Abelianness in spacelike directions. Again, in contrast to standard QFT, the closure of (Hermitian) field operators can destroy localization properties. This problem is addressed in a natural modification of the definition of the closure, called the local closure. This allows one, in conjunction with asymptotic Abelianness, to define a proper reduction of the field algebra to the subspace of the translation invariant states, and to investigate the dimension of this subspace. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 8368-8373 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 448 (2007), S. 285-289 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Large Hadron Collider makes extensive use of existing CERN infrastructure but is in many respects an unprecedented undertaking. It is a proton–proton collider; therefore, it requires two separate accelerator rings with magnetic fields of opposite polarity to guide the two beams in ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 9634-9638 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We propose a simple model for photoinduced charge transfer in conducting polymer C60 composites. Our model consists of coupled Su–Schrieffer–Heeger models for a single polymer chain and a C60 molecule. We have included the coupling of the molecular vibrations to the π electrons but have neglected explicit electron–electron interaction. Using adiabatic and nonadiabatic molecular dynamics, we find photoinduced electron transfer takes place in 200–300 fs. This is consistent with an experimental upper bound of 300 fs. Nonadiabatic effects tend to average out pronounced oscillatory behavior in the adiabatic calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3215-3222 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Vitreous selenium is used extensively for light detection. Its photoconducting properties are altered by structural relaxation near room temperature. X-ray diffraction, densiometry, and calorimetry are used to determine the change of the glass state during relaxation. Annealing for 24 h at 300 K increases the density by 0.14% and lowers the enthalpy by 105 J/mol. The structure factor of cast samples was measured before and after annealing, and reverse Monte Carlo models of the structure of selenium glass were generated to match the data for the quenched and annealed states. Atoms in amorphous selenium are arranged in randomly oriented chains. In the model clusters annealing effects are found by analyzing inter- and intrachain distances, bond angle distributions, and dihedral angle distributions. The average bond length remains unchanged upon annealing, while the distribution of bond lengths becomes narrower by 1.2%. Distances between atoms in adjacent chains decrease by about 0.03%, i.e., the selenium chains move closer together, and the distribution of interchain distances becomes narrower. Bond angles within the chains are affected slightly. The mean bond angle decreases by 0.016°, which indicates a greater folding of the selenium chains and represents an evolution towards the angles found in crystalline selenium phases. The bond angle distribution for the annealed state is 0.006° narrower. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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