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    Electronic Resource
    Electronic Resource
    Coupling characteristics of photo-induced Bragg gratings in depressed- and matched-cladding fibre (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 1641-1654 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Experimental transmission spectra of ultraviolet (u.v.)-written Bragg gratings in depressed- and matched-cladding fibre are characterized and compared. In particular, we discuss how the location and strength of the spectral features vary with the degree of blazing, or angular tilt of the grating. The fine-structure detail on the short-wavelength side of the fundamental Bragg line is attributed to power coupling between the forwardpropagating fundamental (LP01) mode and discrete, backward-propagating cladding modes. Resonances corresponding to backward-propagating LP0n and LP1n modes are identified, and their relative strengths are compared with theoretical overlap calculations. Physical arguments are presented that explain the pronounced ‘ghost’-grating notch that appears in the transmission spectra of blazed, fibre Bragg gratings in depressed-cladding fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331054
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  • 2
    Electronic Resource
    Electronic Resource
    N-terminal polyhedrin sequences and occludedBaculovirus evolution (1981)
    Springer
    Journal of molecular evolution 17 (1981), S. 329-333 
    Details
    ISSN: 1432-1432
    Keywords: Baculovirus ; Polyhedrin ; N-terminal amino acid sequences ; Molecular evolution ; Virus evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A phylogenetic tree for occluded baculoviruses was constructed based on the N-terminal amino acid sequence of occlusion body proteins from six baculoviruses including three lepidopteran nuclear polyhedrosis viruses (NPVs), [two unicapsid (Bombyx mori andOrgyia pseudotsugata) and one multicapsid (Orgyia pseudotsugata)]; one granulosis virus (Pieris brassicae); and NPVs from a hymenopteran (Neodiprion sertifer) and a dipteran (Tipula paludosa). Amino acid sequence data for theB. mori NPV were from a report by Sere-bryani et al. (1977) and that for theO. pseudotsugata NPVs were reported previously by us (Rohrmann et al. 1979). The other N-terminal amino acid sequences are presented in this paper. The phylogenetic relationships determined based on the molecular evolution of polyhedrin were also investigated by antigenic comparisons of the proteins using a solid phase radioimmune assay. The results indicate that the lepidopteran NPVs are the most closely related of the above group of viruses and are related to these viruses in the following order:N. sertifer NPV,P. brassicae granulosis virus, andT. paludosa NPV. These data, in conjunction withBaculovirus distribution and evidence concerning insect phylogeny, suggest that theBaculovirus have an ancient association with insects and may have evolved along with them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01734354
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    Paper (German National Licenses)
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