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  • 1
    Electronic Resource
    Electronic Resource
    Pentacoordinate iron-sulfur complexes. Structure and spectroscopic and electrochemical properties of phenoxy- and thiophenoxy-bridged binuclear complexes (1988)
    s.l. : American Chemical Society
    Inorganic chemistry 27 (1988), S. 1128-1130 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00280a004
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  • 2
    Electronic Resource
    Electronic Resource
    The Precipitation and Mechanical Properties of Al-Li-Mg-Si Alloys (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 331-337 (May 2000), p. 1375-1380 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.331-337.1375.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of Nucleation and Precipitation in Li Containing Al-Zn-Mg-Cu Alloys (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 331-337 (May 2000), p. 1061-1066 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.331-337.1061.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Factors determining hypopharyngeal gland activity of worker honey bees (Apis mellifera L.) (1989)
    Springer
    Insectes sociaux 36 (1989), S. 264-276 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume On examine différents facteurs qui pourraient affecter l'activité des glandes hypopharyngiennes (HP) des ouvrières d'Abeille, tels que l'âge des ouvrières, les stades de développement du couvain et le moment d'introduction ou de retrait du couvain. L'âge des abeilles exerce une influence marquée sur l'activité des glandes HP; celle-ci est corrélée avec la croissance et la résorption des glandes décrites dans la littérature. Seules les larves sont aptes à activer les glandes HP, alors que les œufs et les nymphes ne le sont pas. Les glandes de l'abeille restent inactives pendant trois jours après le début du nourrissage des larves; elles conservent leur activité pendant trois jours environ après le retrait des larves. Ces données sont en accord avec l'hypothèse que c'est le comportement de nourrissage lui-même qui active les glandes; cependant, on ne peut exclure la possibilité que les larves produisent une phéromone stimulante.
    Notes: Summary The effects of worker age, brood stage and time of brood introduction or brood withdrawal on the hypopharyngeal (HP) gland activity of worker bees were examined. Worker age exerted a marked influence on gland activity. Only larvae affected HP gland activity, while eggs and pupae did not. Bees had inactive glands until their third day of larval feeding and they maintained high gland activity for approximately three days after larval removal. The data are congruent with the hypothesis that feeding behaviour itself causes gland activation, although the possibility that larvae produce a primer pheromone cannot be excluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224880
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of a swallow homologue from Drosophila pseudoobscura (2000)
    Springer
    Development genes and evolution 210 (2000), S. 157-161 
    Details
    ISSN: 1432-041X
    Keywords: Key words Swallow ; bicoid ; Drosophila ; mRNA localization ; Oogenesis ; Embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We analyzed a functional homologue of the swallow gene from Drosophila pseudoobscura. The swallow gene of D. melanogaster plays an essential role in localizing bicoid mRNA in oocytes, and swallow mutant embryos show anterior pattern defects that result from the lack of localization of the bicoid morphogen. The pseudoobscura homologue rescues the function of swallow mutants when introduced into the genome of D. melanogaster, and its expression is similar to that of the melanogaster gene. The predicted pseudoobscura and melanogaster proteins are 49% identical and 69% conserved. The coiled-coil domain previously identified in the melanogaster swallow protein is strongly conserved in the pseudoobscura homologue, but the weak similarity of the melanogaster swallow protein to the RNP class of RNA-binding proteins is not conserved in the pseudoobscura homologue. These and other observations suggest a structural role for swallow in localizing bicoid mRNA, perhaps as part of the egg cytoskeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050023
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  • 6
    Electronic Resource
    Electronic Resource
    Extension of the 3D-scaling rule for resistivity as a function of magnetic field and its orientation for anisotropic high-temperature superconductors (1994)
    Springer
    Applied physics 59 (1994), S. 583-587 
    Details
    ISSN: 1432-0630
    Keywords: 74.60.Ge ; 74.25.Fy ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The measurement of the c-axis resistivity of single crystalline La1.86Sr0.14CuO4 is performed at different constant temperatures as a function of magnetic field H and angle θ between H and the ab-plane. It is shown that the 2D- or 3D-scaling rule proposed for high-T c superconductors does not work well for the present system. Taking into account unusual vortex dynamics in the high-T c systems, an extension is made to the 3D-scaling rule developed on the basis of the effective-mass model. Based on this extended rule, it is shown that at each given temperature the observed resistivity as a function of H and θ could be consistently scaled onto the corresponding Lorentz-force-free magnetoresistivity curves directly measured in H‖I‖c.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331916
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  • 7
    Electronic Resource
    Electronic Resource
    High-resolution near-infrared spectroscopy of water dimer (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6613-6631 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High-resolution near-infrared spectra are reported for all of the O–H stretch vibrational bands of the water dimer. The four O–H vibrations are characterized as essentially independent proton-donor or proton-acceptor motions. In addition to the rotational and vibrational information contained in these spectra, details are obtained concerning the internal tunneling dynamics in both the ground and excited vibrational states. These results show that for tunneling motions which involve the interchange of the proton donor and acceptor molecules, the associated frequencies decrease substantially due to vibrational excitation. The predissociation lifetimes for the various states of the dimer are determined from linewidth measurements. These results clearly show that the predissociation dynamics is strongly dependent on the tunneling states, as well as the Ka quantum number, indicating that the internal tunneling dynamics plays an important role in determining the dissociation rate in this complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457380
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  • 8
    Electronic Resource
    Electronic Resource
    Mode specific vibrational relaxation in the acetylene–hydrogen fluoride binary complex (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1478-1483 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optothermal molecular beam technique has been used to record the near infrared spectrum of the acetylene–HF binary complex associated with the ν7 vibrational mode (asymmetric C–H stretch). A fit to this perpendicular band spectrum gives accurate rotational constants for both the ground and excited vibrational states, as well as the vibrational origin, namely A‘=1.192 60(5) cm−1 , B‘=0.157 34(1) cm−1 , C‘=0.138 10(1) cm−1 , A'=1.186 90(5) cm−1 , B'=0.157 34(1) cm−1 , C'=0.138 08(1) cm−1, and ν0 =3276.2889(30) cm−1 . From the homogeneous linewidths of the observed transitions the lifetime of the excited vibrational state has been determined to be 3.6 ns. When compared with the lifetime determined previously for the ν1 mode (0.8 ns) and the data obtained previously for several other systems, it is clear that vibrational relaxation in this molecule is mode specific. A discussion is given concerning the nature of this relaxation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456090
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  • 9
    Electronic Resource
    Electronic Resource
    The structure of the nitrous oxide dimer from sub-Doppler resolution infrared spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5408-5416 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The opto-thermal detection method has been used to obtain rotationally resolved infrared spectra for both (14N14N16O)2 and (15N14N16O)2. The vibrational band observed in each case correlates with the ν1+ν3 band of the N2O monomer. A large number of A- and B-type transitions have been assigned and fit for both species yielding accurate molecular constants for both the ground and excited vibrational states. From intensity alternations associated with nuclear spin statistics and the small inertia defect [Δ‘=0.611 amu A(ring)2 for (14N14N16O)2], it is clear that the nitrous oxide dimer has a slipped parallel geometry which possesses a center of symmetry. Isotopic substitution shows that of the two such structures, only the one having the oxygen atoms close to one another is experimentally observed. The structural constants are determined to be RNN=3.493(4) A(ring) and θNNO=59.2(5)°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455592
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and vibrational dynamics of the CO2 dimer from the sub-Doppler infrared spectrum of the 2.7 μm Fermi diad (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2185-2195 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler infrared spectra of two Fermi resonance coupled bands of carbon dioxide dimer have been obtained at 3611.5 and 3713.9 cm−1 using an optothermal molecular beam color-center laser spectrometer. The band origins for the complexes are red shifted by approximately 1 cm−1 from the corresponding ν1+ν3/2ν02+ν3 CO2 bands. The higher frequency band is perturbed while the lower frequency band appears free of extraneous perturbations as determined from a precision fit to a Watson asymmetric rotor Hamiltonian. This fit and the observed nuclear spin statistical weights reveal that the complex is planar with C2h symmetry. The C--C separation and C--C–O angle are determined to be 3.599(7) A(ring) and 58.2(8)°, respectively. The nearest neighbor O--C distance is 3.14 A(ring) which is the same as that found in the crystal. From the centrifugal distortion analysis the weak bond stretching and symmetric bending frequencies are estimated to be 32(2) and 90(1) cm−1. No interconversion tunneling is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454051
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