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Träfflista för sökning "WFRF:(Richard J) srt2:(1990-1994)"

Search: WFRF:(Richard J) > (1990-1994)

  • Result 1-8 of 8
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  • Kimberling, William J., et al. (author)
  • Localization of Usher syndrome type II to chromosome 1q
  • 1990
  • In: Genomics. - : Elsevier BV. - 0888-7543 .- 1089-8646. ; 7:2, s. 245-249
  • Journal article (peer-reviewed)abstract
    • Usher syndrome is characterized by congenital hearing loss, progressive visual impairment due to retinitis pigmentosa, and variable vestibular problems. The two subtypes of Usher syndrome, types I and II, can be distinguished by the degree of hearing loss and by the presence or absence of vestibular dysfunction. Type I is characterized by a profound hearing loss and totally absent vestibular responses, while type II has a milder hearing loss and normal vestibular function. Fifty-five members of eight type II Usher syndrome families were typed for three DNA markers in the distal region of chromosome 1q: D1S65 (pEKH7.4), REN (pHRnES1.9), and D1S81 (pTHH33). Statistically significant linkage was observed for Usher syndrome type II with a maximum multipoint lod score of 6.37 at the position of the marker THH33, thus localizing the Usher type II (USH2) gene to 1q. Nine families with type I Usher syndrome failed to show linkage to the same three markers. The statistical test for heterogeneity of linkage between Usher syndrome types I and II was highly significant, thus demonstrating that they are due to mutations at different genetic loci.
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  • Nilsson, S., et al. (author)
  • DFB laser with nonuniform coupling coefficient realized by double-layer buried grating
  • 1993
  • In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 5, s. 1128-1131
  • Journal article (peer-reviewed)abstract
    • A technique for the realization of a nonuniform grating coupling coefficient kappa , and its implementation in distributed-feedback (DFB) lasers is presented. This technique, which is an extension of the buried-grating concept, offers precise control of the coupling coefficient and enables a kappa -ratio greater than 10. DFB lasers with an asymmetric kappa -variation have been fabricated using this method. A front-to-rear facet output power ratio close to five was obtained, qualitatively in agreement with simulations.<>
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  • Result 1-8 of 8

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