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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 52 (1960), S. 929-934 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 922-925 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE tobacco mosaic virus, in spite of its limited JL economic importance, has continually played a noteworthy part in virology. It was the first infectious agent to be classified as a virus by the pioneering experiments of Iwanowski (1892) and Beijerinck (1898). It was also the first virus to be ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 259 (1973), S. 371-390 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transient signals measured with a pulsed rf-optical pumping method are used to determine longitudinal relaxation rates for Sr+ ions (even isotopes) in noble gas buffers. Depolarization cross sections of the electronic spin in the Sr+52 S 1/2 ground state for binary collisions with rare gas atoms are deduced. The results for σ(Sr+52 S 1/2) in Å2 are (at temperatures between 374 and 449 °K): 2·10−5(He),4·10−5(Ne), 5.7·10−3(Ar), 1.8·10−2(Kr), and 4.0·10−2(Xe). These cross sections for the Sr+ ion are about two to three orders of magnitude larger than the corresponding ones for the isoelectronic neutral Rb atom. The large increase of the Sr+ relaxation rates is explained with the relaxation mechanism of spin-orbit coupling, taking into account two “indirect” effects of the ionic charge: the increase in the gas kinetic cross sections and the more intimate collisions of the Sr+ ion with the noble gas atoms. The depolarization is shown to be predominantly due to short-range interactions. A contribution to the relaxation of the Sr+ ion from Sr+-noble gas molecule formation, induced by three-body or resonant two-body collisions, could not be established for applied pressuresp between 1.5 and 15 Torr of Ar, Kr, and Xe.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 260 (1973), S. 341-350 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optical pumping with the D2 resonance line can result in a zero2 S 1/2 ground state polarization at a particular buffer gas pressurep 0. For the even isotopes of Sr+ ions, the corresponding relaxation rate Γ1 of the dipolar polarization in the2 P 3/2 excited state can be calculated as a function of the mean lifetime τ of this state directly from the condition of zero2 S 1/2 ground state polarization. The calculation includes the branching decays of the 52 P 3/2 state to the 52 S 1/2 and 42 D 5/2,3/2 states, the collisional quenching from2 P and2 D states, and the diffusion of the Sr+ ions. From the calculated relaxation rate Γ1 and the measured value ofp 0, the cross sections for the destruction of the dipolar polarization in the2 P 3/2 state are obtained, σ1(Sr+52 P 3/2) in Å2: 72±9(He), 80±10(Ne), 124±15 (Ar), 148±18 (Kr), and 196±23 (Xe). The values of σ1 for the Sr+ ion are of comparable magnitude to those for the isoelectronic Rb atom.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 168 (1962), S. 115-128 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of a preceding x-ray irradiation (60 to 200 keV) at the spectral distribution of the photocurrent of “pure” CdS monocrystals is investigated by irradiation with polarized light parallel or perpendicular to thec-axis and at room temperature as well as at −176° C.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 158 (1960), S. 501-510 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wurde der Einfluß von O2, N2, H2, H2O, CO2 sowie von aktiviertem Sauerstoff, Wasserstoff und Stickstoff auf die spektrale Verteilung der Photoleitung undotierter CdS-Einkristalle untersucht. Die Messungen wurden im Spektralbereich der Absorptionskante bei Zimmertemperatur durchgeführt.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 256 (1972), S. 1-21 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method for polarizing thermal ions in buffer gases directly by optical pumping is presented in detail. The production and storage of Sr+ (and Ba+) ions in noble gases, their diffusion and relevant collision processes are discussed. An arc discharge hollow cathode for the generation of intense ionic resonance lines is described. The Sr+ (52 S 1/2) and electron spin polarizations are treated by rate equations. Fitting the solutions to experimental data obtained from transient signals yields an estimate of a few times 103Å2 for the Sr+ion-electron spin exchange cross section.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 58 (1971), S. 575-575 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 10 (1962), S. 376-380 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 139 (1973), S. 217-226 
    ISSN: 1432-0568
    Keywords: Testes, human ; Seminiferous tubules ; Arrangement of seminiferous tubules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An Hoden von menschlichen Feten und Neugeborenen wurde der Versuch unternommen, das Kanälchensystem auf Grund der Kontrolle von Serienschnitten räumlich darzustellen. Leider ist das wegen der zahlreichen Verzweigungen und Verschlingungen der Kanälchen nur grob schematisch möglich. Die Untersuchungen bestätigen aber, daß es sich auch beim Menschen entsprechend den vor allem bei Tieren erhobenen Befunden vorwiegend um Tubulusschlingen handelt, die an beiden Enden in das Rete testis münden. Die Schlingen sind jedoch vielfach verzweigt und bilden damit ganze Bogensysteme und netzartige Strukturen. Blind endende isolierte Kanälchen und blind endende Seitenästchen kommen bei menschlichen Feten und Neugeborenen dagegen kaum vor.
    Notes: Summary Testes of human fetuses and newborns are controlled by serial sections, in order to demonstrate the form and arrangement of the tubular system. Unfortunately, this cannot be done but in a rugh schematic way because of the numerous branchings and coilings of the seminiferous tubules. Nevertheless, our investigations confirm that the tubules from also in human fetuses and newborns essentially arch-like structures with both ends returning to the rete testis as already stated by others, especially in animals. However, these arches show frequent branchings, composing therefore some kind of an arch-system or a network. Single, blindly ending tubules and blindly ending side-branches are hardly seen in human fetuses and newborns.
    Type of Medium: Electronic Resource
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