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  • 1
    Electronic Resource
    Electronic Resource
    Energy-Consuming Micromechanisms in the Fracture of Glassy Polymers. 2. Effect of Molecular Weight on the Fracture of Polystyrene (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 152-159 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00105a020
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  • 2
    Electronic Resource
    Electronic Resource
    Thief workers and variation in nestmate recognition behavior in a ponerine ant, Ectatomma ruidum (1999)
    Springer
    Insectes sociaux 46 (1999), S. 327-331 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Nestmate recognition, cleptobiosis, theft, home range, Barro Colorado Island.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract: Our findings give new insight into the relationship between nestmate recognition and cleptobiosis, intraspecific thievery of newly collected food items, in a neotropical ponerine ant, Ectatomma ruidum. The expression of discrimination of nestmates from non-nestmates varied among local aggregations of E. ruidum in a population at Barro Colorado Island, Panama. This result is due to differences in the behavior of the guard ants among aggregations, rather than differences in the expression of recognition cues by ants. Baiting experiments show that E. ruidum colonies in Panama have a greater tendency to have overlapping home ranges than a similar population in Costa Rica. The pattern of cleptobiosis, however, is strikingly similar between the Panamanian and Costa Rican populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050153
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  • 3
    Electronic Resource
    Electronic Resource
    AES Depth profiling of semiconducting multilayer structures using an ion beam bevelling technique (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 358-360 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An ion beam technique has been developed which allows the preparation of bevels from semiconducting heteroepitaxial structures with smooth surfaces and very flat angles in the order of 0.1°. The bevels are used for AES depth profiling of heterostructures by the line scan technique. Measured and calculated line scans from (Al,Ga)As/GaAs and SiGe/Si test structures are compared to estimate the contributions of the electron escape depth and the ion beam mixing to the depth resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050429
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  • 4
    Electronic Resource
    Electronic Resource
    The [NiFe] hydrogenases of Methanococcus voltae: genes, enzymes and regulation (1997)
    Springer
    Archives of microbiology 167 (1997), S. 189-195 
    Details
    ISSN: 1432-072X
    Keywords: Key words [NiFe] Hydrogenases ; Methanococcus ; voltae ; Archaea ; Selenocysteine ; Selenium-dependent ; gene regulation ; Operator ; Silencer ; EPR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Methanococcus voltae carries genetic information for four [NiFe] hydrogenases. Two of the hydrogenases are predicted to contain selenocysteine on the basis of in-frame TGA codons, while the genes encoding the two other enzymes contain cysteine codons at homologous positions. Their predicted subunit compositions and their electron acceptor specificities are similar to those of the respective selenium-containing enzymes. The selenium-containing hydrogenases have been purified and characterized. Only one of them reduces the deazaflavin F420. The activity of the F420-nonreducing enzyme is exceptionally high. The selenium atom has been shown by EPR spectroscopy to be a ligand to the Ni atom in the primary reaction centers in both enzymes. The spectroscopic analyses also yielded a description of the electronic configuration around the NiFe center at different oxidation states and in the presence of the competitive inhibitor, CO. The genes encoding the selenium-free hydrogenases are expressed only in the absence of selenium. They are linked by an intergenic region in which regulatory cis elements were defined by employing reporter gene constructs and site-directed mutagenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050434
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  • 5
    Electronic Resource
    Electronic Resource
    The vhuU gene encoding a small subunit of a selenium-containing [NiFe]-hydrogenase in Methanococcus voltae appears to be essential for the cell (1998)
    Springer
    Archives of microbiology 170 (1998), S. 418-426 
    Details
    ISSN: 1432-072X
    Keywords: Key words Archaea ; Methanococcus voltae ; Deletion ; mutagenesis ; Adaptation ; Selenium deprivation ; [NiFe]-hydrogenases ; Gene replacement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We developed a general method for the site-specific deletion of gene sequences to obtain new selectable markers in the archaeon Methanococcus voltae. Using a deletion in the hisA gene, a vector was integrated into the chromosome by homologous recombination, thereby reconstituting histidine prototrophy. The vector contained the β-glucuronidase gene uidA of Escherichia coli as a reporter under the control of an M. voltae promoter that normally drives the expression of a selenium-free [NiFe]-hydrogenase after selenium deprivation. This construct has allowed us to check whether the selenium supply was sufficiently low to induce the transcription of the genes encoding the selenium-free hydrogenases. We tried to introduce a chromosomal deletion of the vhuU gene of the archaeon M. voltae by gene replacement and by keeping the cells under selenium deprivation. The gene vhuU encodes the very small, selenocysteine-containing subunit that is part of the primary reaction center of the Vhu hydrogenase. All transformants bearing the deletion also contained the vhuU wild-type gene. Therefore, the vhuU gene appears to be essential for the cell even under conditions that lead to the induction of the selenium-free homologue Vhc of the Vhu hydrogenase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050662
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental check of the dispersion law for ultracold neutrons (1998)
    Springer
    JETP letters 67 (1998), S. 786-792 
    Details
    ISSN: 1090-6487
    Keywords: 28.20.Cz ; 11.55.Fv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experiment to check the standard dispersion law for ultracold neutrons is described. The experiment is based on searching for a shift of the resonance line of a neutron interference filter as the neutron velocity component parallel to the filter surface is varied. The first results attest to a statistically significant effect. No mimicking effects were found in a control experiment, but their possible existence cannot be completely ruled out at present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567749
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental Tests of the Foundations of Quantum Mechanics Using Neutrons: The Scalar A-B Effect (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 755 (1995), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1995.tb38972.x
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  • 8
    Electronic Resource
    Electronic Resource
    Partial density of states in the CuInSe2 valence bands (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7806-7809 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The valence band spectra of a vacuum cleaved CuInSe2 (011) surface were measured with synchrotron radiation at photon energies between 16 and 95 eV. The strong dependence of the photoionization cross section of atomic levels between 28 and 60 eV is used to divide the valence band emissions into contributions from Se 4p and Cu 3d states in order to map the respective partial density of states. The derived partial density of Cu 3d states to the total valence band density of states is around 50% in the upper part of the valence band and about 75% at its maximum corresponding to non-bonding Cu d states. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365390
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  • 9
    Electronic Resource
    Electronic Resource
    Point-group symmetrized boson representation. Algebraic solution for symmetry-adapted bases of Oh (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 2400-2425 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A point group symmetrized boson representation (SBR) is introduced that is particularly convenient for describing molecular vibrations. In this paper the SBR is elucidated using the example of the molecule SF6 with Oh symmetry. The advantages of the SBR are that its basis vectors have a clear physical picture, their number is very small (equal to one-eighth of the dimension of the reducible representation for Oh), and the irreducible bases for any concrete cases can be obtained trivially from those for the general case without any projection. All the irreducible bases for the group chains Oh&supuline;D4&supuline;C4 or Oh&supuline;D4&supuline;D2 are tabulated once and for all. As an application, the Hamiltonian in the algebraic model of Iachello and Oss for stretching vibrations of the molecule SF6 is diagonalized in the symmetry adapted bases. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531518
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  • 10
    Electronic Resource
    Electronic Resource
    Fermi-level-dependent defect formation in Cu-chalcopyrite semiconductors (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2283-2285 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Valence-band photoelectron spectroscopy of CuInSe2, CuInS2, and CuGaSe2 surfaces and interfaces give evidence for the formation of Cu vacancies when the Fermi level moves upwards in the band gap due to contact formation. The effect might be a key issue in understanding basic properties of solar cell devices based on these materials. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123825
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