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  • 1
    Electronic Resource
    Electronic Resource
    Fluence limiting via photorefractive two-beam coupling (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 37-44 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optimum performance of a photorefractive two-beam coupling fluence limiter is presented. A two-level, single-dopant-species model is used to determine the minimum transmitted fluence for different crystal dopant densities and incident fluences. The effects on limiter performance for different beam parameters such as the modulation ratio and crossing angle and for different crystal parameters such as the mobility, electro-optic coefficient, and dielectric constant are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351382
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  • 2
    Electronic Resource
    Electronic Resource
    Optically induced quasi-phase matching in strontium barium niobate (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1865-1867 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We observe dynamic ferroelectric domain gratings in strontium barium niobate (SBN) induced by photorefractive space charge fields. The optically induced modulation of the spontaneous polarization attains a maximum of 1%. Quasi-phase matched second harmonic enhancements are observed above the ferroelectric-paraelectric phase transition due to the glassy ferroelectric nature of SBN. We find that the second harmonic power is significantly enhanced by recording gratings in optically fatigued rather than electrically poled crystals. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113303
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  • 3
    Electronic Resource
    Electronic Resource
    Tunable quasi-phase matching using dynamic ferroelectric domain gratings induced by photorefractive space-charge fields (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3068-3070 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate a method of dynamic, tunable quasi-phase matched second-harmonic generation using optically induced polarization gratings with periods equal to twice the coherence length. These gratings increase the peak second-harmonic conversion efficiency by a factor of 17 above a poled strontium barium niobate crystal, to 0.01% for fundamental beam intensities of 0.8 MW cm−2. We generate quasi-phase matching spectral response peaks as narrow as 0.175 nm and tailor the response by writing an ensemble of gratings in the same volume, each of which enhances the second-harmonic generation at a predetermined wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111349
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    In vivo assay for protein-protein interactions using Drosophila chromosomes (1996)
    Springer
    Chromosoma 104 (1996), S. 393-404 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The ability of a chimeric HP1-Polycomb (Pc) protein to bind both to heterochromatin and to euchromatic sites of Pc protein binding was exploited to detect stable protein-protein interactions in vivo. Previously, we showed that endogenous Pc protein was recruited to ectopic heterochromatic binding sites by the chimeric protein. Here, we examine the association of other Pc group (Pc-G) proteins. We show that Posterior sex combs (Psc) protein also is recruited to heterochromatin by the chimeric protein, demonstrating that Psc protein participates in direct protein-protein interaction with Pc protein or Pc-associated protein. In flies carrying temperature-sensitive alleles of Enhancer of zeste[E(z)] the general decondensation of polytene chromosomes that occurs at the restrictive temperature is associated with loss of binding of endogenous Pc and chimeric HP1-Polycomb protein to euchromatin, but binding of HP1 and chimeric HP1-Polycomb protein to the heterochromatin is maintained. The E(z) mutation also results in the loss of chimera-dependent binding to heterochromatin by endogenous Pc and Psc proteins at the restrictive temperature, suggesting that interaction of these proteins is mediated by E(z) protein. A myc-tagged full-length Suppressor 2 of zeste [Su(z)2] protein interacts poorly or not at all with ectopic Pc-G complexes, but a truncated Su(z)2 protein is strongly recruited to all sites of chimeric protein binding. Trithorax protein is not recruited to the heterochromatin by the chimeric HP1-Polycomb protein, suggesting either that this protein does not interact directly with Pc-G complexes or that such interactions are regulated. Ectopic binding of chimeric chromosomal proteins provides a useful tool for distinguishing specific protein-protein interactions from specific protein-DNA interactions important for complex assembly in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352263
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    In vivo assay for protein-protein interactions using Drosophila chromosomes (1996)
    Springer
    Chromosoma 104 (1996), S. 393-404 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The ability of a chimeric HP1-Polycomb (Pc) protein to bind both to heterochromatin and to euchromatic sites of Pc protein binding was exploited to detect stable protein-protein interactions in vivo. Previously, we showed that endogenous Pc protein was recruited to ectopic heterochromatic binding sites by the chimeric protein. Here, we examine the association of other Pc group (Pc-G) proteins. We show that Posterior sex combs (Psc) protein also is recruited to heterochromatin by the chimeric protein, demonstrating that Psc protein participates in direct protein-protein interaction with Pc protein or Pc-associated protein. In flies carrying temperature-sensitive alleles of Enhancer of zeste[E(z)] the general decondensation of polytene chromosomes that occurs at the restrictive temperature is associated with loss of binding of endogenous Pc and chimeric HP1-Polycomb protein to euchromatin, but binding of HP1 and chimeric HP1-Polycomb protein to the heterochromatin is maintained. The E(z) mutation also results in the loss of chimera-dependent binding to heterochromatin by endogenous Pc and Psc proteins at the restrictive temperature, suggesting that interaction of these proteins is mediated by E(z) protein. A myc-tagged full-length Suppressor 2 of zeste [Su(z)2] protein interacts poorly or not at all with ectopic Pc-G complexes, but a truncated Su(z)2 protein is strongly recruited to all sites of chimeric protein binding. Trithorax protein is not recruited to the heterochromatin by the chimeric HP1-Polycomb protein, suggesting either that this protein does not interact directly with Pc-G complexes or that such interactions are regulated. Ectopic binding of chimeric chromosomal proteins provides a useful tool for distinguishing specific protein-protein interactions from specific protein-DNA interactions important for complex assembly in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352263
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The conserved HR domain of the Drosophila Suppressor 2 of zeste [Su(z)2] and murine bmi-1 proteins constitutes a locus-specific chromosome binding domain (1997)
    Springer
    Chromosoma 106 (1997), S. 70-80 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The related Drosophila Suppressor 2 of zeste [Su(z)2] and Posterior sex combs (Psc) proteins are both locus-specific chromosome binding proteins. They are found at many of the same polytene chromosome loci as other Polycomb-group proteins. The 1,365 amino acid Su(z)2 protein and the 1,603 amino acid Psc protein share a conserved 200 amino acid domain, the homology region (HR). To identify the protein domain responsible for locus-specific chromosome binding, we made a series of Hsp70:cDNA deletion constructs of the Sz(z)2 gene and transformed these into flies. We found that the HR is necessary and sufficient for Su(z)2 locus-specific polytene chromosome binding. The murine Bmi-1 protein also shares the conserved HR domain. When expressed in flies, the Bmi-1 protein showed a locus-specific chromosome binding pattern similar to that of the Su(z)2 and Psc proteins. These results argue that a locus-specific chromosome binding function resides in the HR domain. Other results show that a second, low affinity, non-specific chromosome binding function is localized outside the HR in the Su(z)2 protein, and that the Su(z)2 protein contains at least two nuclear localization signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050226
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    Paper (German National Licenses)
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